diff --git a/config/config.exs b/config/config.exs
index 391bee315..9982acc95 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -13,12 +13,15 @@ config :mobilizon, :instance,
   name: System.get_env("MOBILIZON_INSTANCE_NAME") || "Localhost",
   description: System.get_env("MOBILIZON_INSTANCE_DESCRIPTION") || "This is a Mobilizon instance",
   version: "1.0.0-dev",
+  hostname: System.get_env("MOBILIZON_INSTANCE_HOST") || "localhost",
   registrations_open: System.get_env("MOBILIZON_INSTANCE_REGISTRATIONS_OPEN") || false,
   repository: Mix.Project.config()[:source_url],
   remote_limit: 100_000,
   upload_limit: 16_000_000,
   avatar_upload_limit: 2_000_000,
-  banner_upload_limit: 4_000_000
+  banner_upload_limit: 4_000_000,
+  email_from: "noreply@localhost",
+  email_reply_to: "noreply@localhost"
 
 config :mime, :types, %{
   "application/activity+json" => ["activity-json"],
@@ -30,10 +33,7 @@ config :mobilizon, MobilizonWeb.Endpoint,
   url: [host: "localhost"],
   secret_key_base: "1yOazsoE0Wqu4kXk3uC5gu3jDbShOimTCzyFL3OjCdBmOXMyHX87Qmf3+Tu9s0iM",
   render_errors: [view: MobilizonWeb.ErrorView, accepts: ~w(html json)],
-  pubsub: [name: Mobilizon.PubSub, adapter: Phoenix.PubSub.PG2],
-  instance: "localhost",
-  email_from: "noreply@localhost",
-  email_to: "noreply@localhost"
+  pubsub: [name: Mobilizon.PubSub, adapter: Phoenix.PubSub.PG2]
 
 # Upload configuration
 config :mobilizon, MobilizonWeb.Upload,
diff --git a/lib/mobilizon/actors/actor.ex b/lib/mobilizon/actors/actor.ex
index f48b42517..6cd79ca7e 100644
--- a/lib/mobilizon/actors/actor.ex
+++ b/lib/mobilizon/actors/actor.ex
@@ -35,6 +35,8 @@ defmodule Mobilizon.Actors.Actor do
   alias Mobilizon.Events.{Event, FeedToken}
   alias Mobilizon.Media.File
 
+  alias Mobilizon.Reports.{Report, Note}
+
   alias MobilizonWeb.Router.Helpers, as: Routes
   alias MobilizonWeb.Endpoint
 
@@ -72,6 +74,9 @@ defmodule Mobilizon.Actors.Actor do
     has_many(:feed_tokens, FeedToken, foreign_key: :actor_id)
     embeds_one(:avatar, File, on_replace: :update)
     embeds_one(:banner, File, on_replace: :update)
+    has_many(:created_reports, Report, foreign_key: :reporter_id)
+    has_many(:subject_reports, Report, foreign_key: :reported_id)
+    has_many(:report_notes, Note, foreign_key: :moderator_id)
 
     timestamps()
   end
diff --git a/lib/mobilizon/admin.ex b/lib/mobilizon/admin.ex
new file mode 100644
index 000000000..fba5ee050
--- /dev/null
+++ b/lib/mobilizon/admin.ex
@@ -0,0 +1,48 @@
+defmodule Mobilizon.Admin do
+  @moduledoc """
+  The Admin context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Mobilizon.Repo
+  import Mobilizon.Ecto
+
+  alias Mobilizon.Admin.ActionLog
+
+  @doc """
+  Returns the list of action_logs.
+
+  ## Examples
+
+      iex> list_action_logs()
+      [%ActionLog{}, ...]
+
+  """
+  @spec list_action_logs(integer(), integer()) :: list(ActionLog.t())
+  def list_action_logs(page \\ nil, limit \\ nil) do
+    from(
+      r in ActionLog,
+      preload: [:actor]
+    )
+    |> paginate(page, limit)
+    |> Repo.all()
+  end
+
+  @doc """
+  Creates a action_log.
+
+  ## Examples
+
+      iex> create_action_log(%{field: value})
+      {:ok, %ActionLog{}}
+
+      iex> create_action_log(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_action_log(attrs \\ %{}) do
+    %ActionLog{}
+    |> ActionLog.changeset(attrs)
+    |> Repo.insert()
+  end
+end
diff --git a/lib/mobilizon/admin/action_log.ex b/lib/mobilizon/admin/action_log.ex
new file mode 100644
index 000000000..2b3f80f7e
--- /dev/null
+++ b/lib/mobilizon/admin/action_log.ex
@@ -0,0 +1,27 @@
+defmodule Mobilizon.Admin.ActionLog do
+  @moduledoc """
+  ActionLog entity schema
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+  alias Mobilizon.Actors.Actor
+
+  @required_attrs [:action, :target_type, :target_id, :changes, :actor_id]
+
+  schema "admin_action_logs" do
+    field(:action, :string)
+    field(:target_type, :string)
+    field(:target_id, :integer)
+    field(:changes, :map)
+    belongs_to(:actor, Actor)
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(action_log, attrs) do
+    action_log
+    |> cast(attrs, @required_attrs)
+    |> validate_required(@required_attrs -- [:changes])
+  end
+end
diff --git a/lib/mobilizon/common-config.ex b/lib/mobilizon/common-config.ex
index 2fa021058..091857777 100644
--- a/lib/mobilizon/common-config.ex
+++ b/lib/mobilizon/common-config.ex
@@ -19,7 +19,12 @@ defmodule Mobilizon.CommonConfig do
     |> get_in([:description])
   end
 
-  defp instance_config(), do: Application.get_env(:mobilizon, :instance)
+  def instance_hostname() do
+    instance_config()
+    |> get_in([:hostname])
+  end
+
+  def instance_config(), do: Application.get_env(:mobilizon, :instance)
 
   defp to_bool(v), do: v == true or v == "true" or v == "True"
 
diff --git a/lib/mobilizon/email/admin.ex b/lib/mobilizon/email/admin.ex
new file mode 100644
index 000000000..2157257a6
--- /dev/null
+++ b/lib/mobilizon/email/admin.ex
@@ -0,0 +1,38 @@
+defmodule Mobilizon.Email.Admin do
+  @moduledoc """
+  Handles emails sent to admins
+  """
+  alias Mobilizon.Users.User
+
+  import Bamboo.Email
+  import Bamboo.Phoenix
+  use Bamboo.Phoenix, view: Mobilizon.EmailView
+  import MobilizonWeb.Gettext
+  alias Mobilizon.Reports.Report
+
+  def report(%User{email: email} = _user, %Report{} = report, locale \\ "en") do
+    Gettext.put_locale(locale)
+    instance_url = get_config(:hostname)
+
+    base_email()
+    |> to(email)
+    |> subject(gettext("Mobilizon: New report on instance %{instance}", instance: instance_url))
+    |> put_header("Reply-To", get_config(:email_reply_to))
+    |> assign(:report, report)
+    |> assign(:instance, instance_url)
+    |> render(:report)
+  end
+
+  defp base_email do
+    # Here you can set a default from, default headers, etc.
+    new_email()
+    |> from(get_config(:email_from))
+    |> put_html_layout({Mobilizon.EmailView, "email.html"})
+    |> put_text_layout({Mobilizon.EmailView, "email.text"})
+  end
+
+  @spec get_config(atom()) :: any()
+  defp get_config(key) do
+    Mobilizon.CommonConfig.instance_config() |> Keyword.get(key)
+  end
+end
diff --git a/lib/mobilizon/email/user.ex b/lib/mobilizon/email/user.ex
index 72268b16e..53bdb4a1d 100644
--- a/lib/mobilizon/email/user.ex
+++ b/lib/mobilizon/email/user.ex
@@ -18,7 +18,7 @@ defmodule Mobilizon.Email.User do
     |> subject(
       gettext("Mobilizon: Confirmation instructions for %{instance}", instance: instance_url)
     )
-    |> put_header("Reply-To", get_config(:reply_to))
+    |> put_header("Reply-To", get_config(:email_reply_to))
     |> assign(:token, user.confirmation_token)
     |> assign(:instance, instance_url)
     |> render(:registration_confirmation)
@@ -26,7 +26,7 @@ defmodule Mobilizon.Email.User do
 
   def reset_password_email(%User{} = user, locale \\ "en") do
     Gettext.put_locale(locale)
-    instance_url = get_config(:instance)
+    instance_url = get_config(:hostname)
 
     base_email()
     |> to(user.email)
@@ -36,7 +36,7 @@ defmodule Mobilizon.Email.User do
         instance: instance_url
       )
     )
-    |> put_header("Reply-To", get_config(:reply_to))
+    |> put_header("Reply-To", get_config(:email_reply_to))
     |> assign(:token, user.reset_password_token)
     |> assign(:instance, instance_url)
     |> render(:password_reset)
@@ -45,13 +45,13 @@ defmodule Mobilizon.Email.User do
   defp base_email do
     # Here you can set a default from, default headers, etc.
     new_email()
-    |> from(Application.get_env(:mobilizon, MobilizonWeb.Endpoint)[:email_from])
+    |> from(get_config(:email_from))
     |> put_html_layout({Mobilizon.EmailView, "email.html"})
     |> put_text_layout({Mobilizon.EmailView, "email.text"})
   end
 
   @spec get_config(atom()) :: any()
   defp get_config(key) do
-    _config = Application.get_env(:mobilizon, MobilizonWeb.Endpoint) |> Keyword.get(key)
+    Mobilizon.CommonConfig.instance_config() |> Keyword.get(key)
   end
 end
diff --git a/lib/mobilizon/events/events.ex b/lib/mobilizon/events/events.ex
index 17cb8f8bd..38897e73d 100644
--- a/lib/mobilizon/events/events.ex
+++ b/lib/mobilizon/events/events.ex
@@ -1160,6 +1160,19 @@ defmodule Mobilizon.Events do
     end
   end
 
+  @doc """
+  Get all comments by an actor and a list of ids
+  """
+  def get_all_comments_by_actor_and_ids(actor_id, comment_ids \\ [])
+  def get_all_comments_by_actor_and_ids(_actor_id, []), do: []
+
+  def get_all_comments_by_actor_and_ids(actor_id, comment_ids) do
+    Comment
+    |> where([c], c.id in ^comment_ids)
+    |> where([c], c.actor_id == ^actor_id)
+    |> Repo.all()
+  end
+
   @doc """
   Creates a comment.
 
diff --git a/lib/mobilizon/reports.ex b/lib/mobilizon/reports.ex
new file mode 100644
index 000000000..1bfaac7ac
--- /dev/null
+++ b/lib/mobilizon/reports.ex
@@ -0,0 +1,236 @@
+defmodule Mobilizon.Reports do
+  @moduledoc """
+  The Reports context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Mobilizon.Repo
+  import Mobilizon.Ecto
+
+  alias Mobilizon.Reports.Report
+  alias Mobilizon.Reports.Note
+
+  @doc false
+  def data() do
+    Dataloader.Ecto.new(Mobilizon.Repo, query: &query/2)
+  end
+
+  @doc false
+  def query(queryable, _params) do
+    queryable
+  end
+
+  @doc """
+  Returns the list of reports.
+
+  ## Examples
+
+      iex> list_reports()
+      [%Report{}, ...]
+
+  """
+  @spec list_reports(integer(), integer(), atom(), atom()) :: list(Report.t())
+  def list_reports(page \\ nil, limit \\ nil, sort \\ :updated_at, direction \\ :asc) do
+    from(
+      r in Report,
+      preload: [:reported, :reporter, :manager, :event, :comments, :notes]
+    )
+    |> paginate(page, limit)
+    |> sort(sort, direction)
+    |> Repo.all()
+  end
+
+  @doc """
+  Gets a single report.
+
+  Raises `Ecto.NoResultsError` if the Report does not exist.
+
+  ## Examples
+
+      iex> get_report!(123)
+      %Report{}
+
+      iex> get_report!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_report!(id) do
+    with %Report{} = report <- Repo.get!(Report, id) do
+      Repo.preload(report, [:reported, :reporter, :manager, :event, :comments, :notes])
+    end
+  end
+
+  @doc """
+  Gets a single report.
+
+  Returns `nil` if the Report does not exist.
+
+  ## Examples
+
+      iex> get_report(123)
+      %Report{}
+
+      iex> get_report(456)
+      nil
+
+  """
+  def get_report(id) do
+    with %Report{} = report <- Repo.get(Report, id) do
+      Repo.preload(report, [:reported, :reporter, :manager, :event, :comments, :notes])
+    end
+  end
+
+  @doc """
+  Get a report by it's URL
+  """
+  @spec get_report_by_url(String.t()) :: Report.t() | nil
+  def get_report_by_url(url) do
+    from(
+      r in Report,
+      where: r.uri == ^url
+    )
+    |> Repo.one()
+  end
+
+  @doc """
+  Creates a report.
+
+  ## Examples
+
+      iex> create_report(%{field: value})
+      {:ok, %Report{}}
+
+      iex> create_report(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_report(attrs \\ %{}) do
+    with {:ok, %Report{} = report} <-
+           %Report{}
+           |> Report.creation_changeset(attrs)
+           |> Repo.insert() do
+      {:ok, Repo.preload(report, [:event, :reported, :reporter, :comments])}
+    end
+  end
+
+  @doc """
+  Updates a report.
+
+  ## Examples
+
+      iex> update_report(report, %{field: new_value})
+      {:ok, %Report{}}
+
+      iex> update_report(report, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_report(%Report{} = report, attrs) do
+    report
+    |> Report.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a Report.
+
+  ## Examples
+
+      iex> delete_report(report)
+      {:ok, %Report{}}
+
+      iex> delete_report(report)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_report(%Report{} = report) do
+    Repo.delete(report)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking report changes.
+
+  ## Examples
+
+      iex> change_report(report)
+      %Ecto.Changeset{source: %Report{}}
+
+  """
+  def change_report(%Report{} = report) do
+    Report.changeset(report, %{})
+  end
+
+  @doc """
+  Returns the list of notes for a report.
+
+  ## Examples
+
+      iex> list_notes_for_report(%Report{id: 1})
+      [%Note{}, ...]
+
+  """
+  @spec list_notes_for_report(Report.t()) :: list(Report.t())
+  def list_notes_for_report(%Report{id: report_id}) do
+    from(
+      n in Note,
+      where: n.report_id == ^report_id,
+      preload: [:report, :moderator]
+    )
+    |> Repo.all()
+  end
+
+  @doc """
+  Gets a single note.
+
+  Raises `Ecto.NoResultsError` if the Note does not exist.
+
+  ## Examples
+
+      iex> get_note!(123)
+      %Note{}
+
+      iex> get_note!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_note!(id), do: Repo.get!(Note, id)
+
+  def get_note(id), do: Repo.get(Note, id)
+
+  @doc """
+  Creates a note report.
+
+  ## Examples
+
+      iex> create_report_note(%{field: value})
+      {:ok, %Note{}}
+
+      iex> create_report_note(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_report_note(attrs \\ %{}) do
+    with {:ok, %Note{} = note} <-
+           %Note{}
+           |> Note.changeset(attrs)
+           |> Repo.insert() do
+      {:ok, Repo.preload(note, [:report, :moderator])}
+    end
+  end
+
+  @doc """
+  Deletes a note report.
+
+  ## Examples
+
+      iex> delete_report_note(note)
+      {:ok, %Note{}}
+
+      iex> delete_report_note(note)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_report_note(%Note{} = note) do
+    Repo.delete(note)
+  end
+end
diff --git a/lib/mobilizon/reports/note.ex b/lib/mobilizon/reports/note.ex
new file mode 100644
index 000000000..a7d8ad30e
--- /dev/null
+++ b/lib/mobilizon/reports/note.ex
@@ -0,0 +1,27 @@
+defmodule Mobilizon.Reports.Note do
+  @moduledoc """
+  Report Note entity
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Reports.Report
+
+  @attrs [:content, :moderator_id, :report_id]
+
+  @derive {Jason.Encoder, only: [:content]}
+  schema "report_notes" do
+    field(:content, :string)
+    belongs_to(:moderator, Actor)
+    belongs_to(:report, Report)
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(note, attrs) do
+    note
+    |> cast(attrs, @attrs)
+    |> validate_required(@attrs)
+  end
+end
diff --git a/lib/mobilizon/reports/report.ex b/lib/mobilizon/reports/report.ex
new file mode 100644
index 000000000..11d55e824
--- /dev/null
+++ b/lib/mobilizon/reports/report.ex
@@ -0,0 +1,59 @@
+import EctoEnum
+
+defenum(Mobilizon.Reports.ReportStateEnum, :report_state, [
+  :open,
+  :closed,
+  :resolved
+])
+
+defmodule Mobilizon.Reports.Report do
+  @moduledoc """
+  Report entity
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+  alias Mobilizon.Events.Comment
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Reports.Note
+
+  @derive {Jason.Encoder, only: [:status, :uri]}
+  schema "reports" do
+    field(:content, :string)
+    field(:status, Mobilizon.Reports.ReportStateEnum, default: :open)
+    field(:uri, :string)
+
+    # The reported actor
+    belongs_to(:reported, Actor)
+
+    # The actor who reported
+    belongs_to(:reporter, Actor)
+
+    # The actor who last acted on this report
+    belongs_to(:manager, Actor)
+
+    # The eventual Event inside the report
+    belongs_to(:event, Event)
+
+    # The eventual Comments inside the report
+    many_to_many(:comments, Comment, join_through: "reports_comments", on_replace: :delete)
+
+    # The notes associated to the report
+    has_many(:notes, Note, foreign_key: :report_id)
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(report, attrs) do
+    report
+    |> cast(attrs, [:content, :status, :uri, :reported_id, :reporter_id, :manager_id, :event_id])
+    |> validate_required([:content, :uri, :reported_id, :reporter_id])
+  end
+
+  def creation_changeset(report, attrs) do
+    report
+    |> changeset(attrs)
+    |> put_assoc(:comments, attrs["comments"])
+  end
+end
diff --git a/lib/mobilizon/users/users.ex b/lib/mobilizon/users/users.ex
index 1628cc670..4f603cb79 100644
--- a/lib/mobilizon/users/users.ex
+++ b/lib/mobilizon/users/users.ex
@@ -258,6 +258,36 @@ defmodule Mobilizon.Users do
     )
   end
 
+  @doc """
+  Returns the list of administrators.
+
+  ## Examples
+
+      iex> list_admins()
+      [%Mobilizon.Users.User{role: :administrator}]
+
+  """
+  def list_admins() do
+    User
+    |> where([u], u.role == ^:administrator)
+    |> Repo.all()
+  end
+
+  @doc """
+  Returns the list of moderators.
+
+  ## Examples
+
+      iex> list_moderators()
+      [%Mobilizon.Users.User{role: :moderator}, %Mobilizon.Users.User{role: :administrator}]
+
+  """
+  def list_moderators() do
+    User
+    |> where([u], u.role in ^[:administrator, :moderator])
+    |> Repo.all()
+  end
+
   def count_users() do
     Repo.one(
       from(
diff --git a/lib/mobilizon_web/api/events.ex b/lib/mobilizon_web/api/events.ex
index 7adb7ac01..e5873800a 100644
--- a/lib/mobilizon_web/api/events.ex
+++ b/lib/mobilizon_web/api/events.ex
@@ -26,7 +26,7 @@ defmodule MobilizonWeb.API.Events do
            Actors.get_local_actor_with_everything(organizer_actor_id),
          title <- String.trim(title),
          mentions <- Formatter.parse_mentions(description),
-         visibility <- Map.get(args, :visibility, "public"),
+         visibility <- Map.get(args, :visibility, :public),
          {to, cc} <- to_for_actor_and_mentions(actor, mentions, nil, Atom.to_string(visibility)),
          tags <- Formatter.parse_tags(description),
          picture <- Map.get(args, :picture, nil),
diff --git a/lib/mobilizon_web/api/reports.ex b/lib/mobilizon_web/api/reports.ex
new file mode 100644
index 000000000..3010c6ecb
--- /dev/null
+++ b/lib/mobilizon_web/api/reports.ex
@@ -0,0 +1,128 @@
+defmodule MobilizonWeb.API.Reports do
+  @moduledoc """
+  API for Reports
+  """
+
+  alias Mobilizon.Actors
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Events
+  alias Mobilizon.Activity
+  alias Mobilizon.Reports, as: ReportsAction
+  alias Mobilizon.Reports.{Report, Note}
+  alias Mobilizon.Service.ActivityPub
+  alias Mobilizon.Users
+  alias Mobilizon.Users.User
+  import MobilizonWeb.API.Utils
+  import Mobilizon.Service.Admin.ActionLogService
+
+  @doc """
+  Create a report/flag on an actor, and optionally on an event or on comments.
+  """
+  def report(
+        %{
+          reporter_actor_id: reporter_actor_id,
+          reported_actor_id: reported_actor_id,
+          event_id: event_id,
+          comments_ids: comments_ids,
+          report_content: report_content
+        } = args
+      ) do
+    with {:reporter, %Actor{url: reporter_url} = _reporter_actor} <-
+           {:reporter, Actors.get_actor!(reporter_actor_id)},
+         {:reported, %Actor{url: reported_actor_url} = reported_actor} <-
+           {:reported, Actors.get_actor!(reported_actor_id)},
+         {:ok, content} <- make_report_content_html(report_content),
+         {:ok, event} <-
+           if(event_id, do: Events.get_event(event_id), else: {:ok, nil}),
+         {:get_report_comments, comments_urls} <-
+           get_report_comments(reported_actor, comments_ids),
+         {:make_activity, {:ok, %Activity{} = activity, %Report{} = report}} <-
+           {:make_activity,
+            ActivityPub.flag(%{
+              reporter_url: reporter_url,
+              reported_actor_url: reported_actor_url,
+              event_url: (!is_nil(event) && event.url) || nil,
+              comments_url: comments_urls,
+              content: content,
+              forward: args[:forward] || false,
+              local: args[:local] || args[:forward] || false
+            })} do
+      {:ok, activity, report}
+    else
+      {:error, err} -> {:error, err}
+      {:actor_id, %{}} -> {:error, "Valid `actor_id` required"}
+      {:reporter, nil} -> {:error, "Reporter Actor not found"}
+      {:reported, nil} -> {:error, "Reported Actor not found"}
+    end
+  end
+
+  @doc """
+  Update the state of a report
+  """
+  def update_report_status(%Actor{} = actor, %Report{} = report, state) do
+    with {:valid_state, true} <-
+           {:valid_state, Mobilizon.Reports.ReportStateEnum.valid_value?(state)},
+         {:ok, report} <- ReportsAction.update_report(report, %{"status" => state}),
+         {:ok, _} <- log_action(actor, "update", report) do
+      {:ok, report}
+    else
+      {:valid_state, false} -> {:error, "Unsupported state"}
+    end
+  end
+
+  defp get_report_comments(%Actor{id: actor_id}, comment_ids) do
+    {:get_report_comments,
+     Events.get_all_comments_by_actor_and_ids(actor_id, comment_ids) |> Enum.map(& &1.url)}
+  end
+
+  defp get_report_comments(_, _), do: {:get_report_comments, nil}
+
+  @doc """
+  Create a note on a report
+  """
+  @spec create_report_note(Report.t(), Actor.t(), String.t()) :: {:ok, Note.t()}
+  def create_report_note(
+        %Report{id: report_id},
+        %Actor{id: moderator_id, user_id: user_id} = moderator,
+        content
+      ) do
+    with %User{role: role} <- Users.get_user!(user_id),
+         {:role, true} <- {:role, role in [:administrator, :moderator]},
+         {:ok, %Note{} = note} <-
+           Mobilizon.Reports.create_report_note(%{
+             "report_id" => report_id,
+             "moderator_id" => moderator_id,
+             "content" => content
+           }),
+         {:ok, _} <- log_action(moderator, "create", note) do
+      {:ok, note}
+    else
+      {:role, false} ->
+        {:error, "You need to be a moderator or an administrator to create a note on a report"}
+    end
+  end
+
+  @doc """
+  Delete a report note
+  """
+  @spec delete_report_note(Note.t(), Actor.t()) :: {:ok, Note.t()}
+  def delete_report_note(
+        %Note{moderator_id: note_moderator_id} = note,
+        %Actor{id: moderator_id, user_id: user_id} = moderator
+      ) do
+    with {:same_actor, true} <- {:same_actor, note_moderator_id == moderator_id},
+         %User{role: role} <- Users.get_user!(user_id),
+         {:role, true} <- {:role, role in [:administrator, :moderator]},
+         {:ok, %Note{} = note} <-
+           Mobilizon.Reports.delete_report_note(note),
+         {:ok, _} <- log_action(moderator, "delete", note) do
+      {:ok, note}
+    else
+      {:role, false} ->
+        {:error, "You need to be a moderator or an administrator to create a note on a report"}
+
+      {:same_actor, false} ->
+        {:error, "You can only remove your own notes"}
+    end
+  end
+end
diff --git a/lib/mobilizon_web/api/utils.ex b/lib/mobilizon_web/api/utils.ex
index 8305a0a93..c06e641a4 100644
--- a/lib/mobilizon_web/api/utils.ex
+++ b/lib/mobilizon_web/api/utils.ex
@@ -120,4 +120,16 @@ defmodule MobilizonWeb.API.Utils do
   #   |> Formatter.add_hashtag_links(tags)
   #   |> Formatter.finalize()
   # end
+
+  def make_report_content_html(nil), do: {:ok, {nil, [], []}}
+
+  def make_report_content_html(comment) do
+    max_size = Mobilizon.CommonConfig.get([:instance, :max_report_comment_size], 1000)
+
+    if String.length(comment) <= max_size do
+      {:ok, Formatter.html_escape(comment, "text/plain")}
+    else
+      {:error, "Comment must be up to #{max_size} characters"}
+    end
+  end
 end
diff --git a/lib/mobilizon_web/resolvers/admin.ex b/lib/mobilizon_web/resolvers/admin.ex
new file mode 100644
index 000000000..4f9972428
--- /dev/null
+++ b/lib/mobilizon_web/resolvers/admin.ex
@@ -0,0 +1,72 @@
+defmodule MobilizonWeb.Resolvers.Admin do
+  @moduledoc """
+  Handles the report-related GraphQL calls
+  """
+  alias Mobilizon.Users.User
+  import Mobilizon.Users.Guards
+  alias Mobilizon.Admin.ActionLog
+  alias Mobilizon.Reports.{Report, Note}
+
+  def list_action_logs(_parent, %{page: page, limit: limit}, %{
+        context: %{current_user: %User{role: role}}
+      })
+      when is_moderator(role) do
+    with action_logs <- Mobilizon.Admin.list_action_logs(page, limit) do
+      action_logs =
+        Enum.map(action_logs, fn %ActionLog{
+                                   target_type: target_type,
+                                   action: action,
+                                   actor: actor,
+                                   id: id
+                                 } = action_log ->
+          transform_action_log(target_type, action, action_log)
+          |> Map.merge(%{
+            actor: actor,
+            id: id
+          })
+        end)
+
+      {:ok, action_logs}
+    end
+  end
+
+  def list_action_logs(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in and a moderator to list action logs"}
+  end
+
+  defp transform_action_log(
+         "Elixir.Mobilizon.Reports.Report",
+         "update",
+         %ActionLog{} = action_log
+       ) do
+    with %Report{status: status} = report <- Mobilizon.Reports.get_report(action_log.target_id) do
+      %{
+        action: "report_update_" <> to_string(status),
+        object: report
+      }
+    end
+  end
+
+  defp transform_action_log("Elixir.Mobilizon.Reports.Note", "create", %ActionLog{
+         changes: changes
+       }) do
+    %{
+      action: "note_creation",
+      object: convert_changes_to_struct(Note, changes)
+    }
+  end
+
+  defp transform_action_log("Elixir.Mobilizon.Reports.Note", "delete", %ActionLog{
+         changes: changes
+       }) do
+    %{
+      action: "note_deletion",
+      object: convert_changes_to_struct(Note, changes)
+    }
+  end
+
+  # Changes are stored as %{"key" => "value"} so we need to convert them back as struct
+  defp convert_changes_to_struct(struct, changes) do
+    struct(struct, for({key, val} <- changes, into: %{}, do: {String.to_atom(key), val}))
+  end
+end
diff --git a/lib/mobilizon_web/resolvers/report.ex b/lib/mobilizon_web/resolvers/report.ex
new file mode 100644
index 000000000..dd3655050
--- /dev/null
+++ b/lib/mobilizon_web/resolvers/report.ex
@@ -0,0 +1,118 @@
+defmodule MobilizonWeb.Resolvers.Report do
+  @moduledoc """
+  Handles the report-related GraphQL calls
+  """
+  alias Mobilizon.Reports
+  alias Mobilizon.Reports.{Report, Note}
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Actors
+  alias Mobilizon.Users.User
+  alias MobilizonWeb.API.Reports, as: ReportsAPI
+  import Mobilizon.Users.Guards
+
+  def list_reports(_parent, %{page: page, limit: limit}, %{
+        context: %{current_user: %User{role: role}}
+      })
+      when is_moderator(role) do
+    {:ok, Mobilizon.Reports.list_reports(page, limit)}
+  end
+
+  def list_reports(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in and a moderator to list reports"}
+  end
+
+  def get_report(_parent, %{id: id}, %{
+        context: %{current_user: %User{role: role}}
+      })
+      when is_moderator(role) do
+    {:ok, Mobilizon.Reports.get_report(id)}
+  end
+
+  def get_report(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in and a moderator to view a report"}
+  end
+
+  @doc """
+  Create a report
+  """
+  def create_report(
+        _parent,
+        %{reporter_actor_id: reporter_actor_id} = args,
+        %{context: %{current_user: user}} = _resolution
+      ) do
+    with {:is_owned, true, _} <- User.owns_actor(user, reporter_actor_id),
+         {:ok, _, %Report{} = report} <- ReportsAPI.report(args) do
+      {:ok, report}
+    else
+      {:is_owned, false} ->
+        {:error, "Reporter actor id is not owned by authenticated user"}
+
+      _err ->
+        {:error, "Error while saving report"}
+    end
+  end
+
+  def create_report(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in to create reports"}
+  end
+
+  @doc """
+  Update a report's status
+  """
+  def update_report(
+        _parent,
+        %{report_id: report_id, moderator_id: moderator_id, status: status},
+        %{
+          context: %{current_user: %User{role: role} = user}
+        }
+      )
+      when is_moderator(role) do
+    with {:is_owned, true, _} <- User.owns_actor(user, moderator_id),
+         %Actor{} = actor <- Actors.get_actor!(moderator_id),
+         %Report{} = report <- Mobilizon.Reports.get_report(report_id),
+         {:ok, %Report{} = report} <-
+           MobilizonWeb.API.Reports.update_report_status(actor, report, status) do
+      {:ok, report}
+    else
+      {:is_owned, false} ->
+        {:error, "Actor id is not owned by authenticated user"}
+
+      _err ->
+        {:error, "Error while updating report"}
+    end
+  end
+
+  def update_report(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in and a moderator to update a report"}
+  end
+
+  def create_report_note(
+        _parent,
+        %{report_id: report_id, moderator_id: moderator_id, content: content},
+        %{
+          context: %{current_user: %User{role: role} = user}
+        }
+      )
+      when is_moderator(role) do
+    with {:is_owned, true, _} <- User.owns_actor(user, moderator_id),
+         %Report{} = report <- Reports.get_report(report_id),
+         %Actor{} = moderator <- Actors.get_local_actor_with_everything(moderator_id),
+         {:ok, %Note{} = note} <-
+           MobilizonWeb.API.Reports.create_report_note(report, moderator, content) do
+      {:ok, note}
+    end
+  end
+
+  def delete_report_note(_parent, %{note_id: note_id, moderator_id: moderator_id}, %{
+        context: %{current_user: %User{role: role} = user}
+      })
+      when is_moderator(role) do
+    with {:is_owned, true, _} <- User.owns_actor(user, moderator_id),
+         %Note{} = note <- Reports.get_note(note_id),
+         %Actor{} = moderator <- Actors.get_local_actor_with_everything(moderator_id),
+         {:ok, %Note{} = note} <-
+           MobilizonWeb.API.Reports.delete_report_note(note, moderator) do
+      {:ok, %{id: note.id}}
+    end
+  end
+end
diff --git a/lib/mobilizon_web/schema.ex b/lib/mobilizon_web/schema.ex
index e1cc49e16..38d223007 100644
--- a/lib/mobilizon_web/schema.ex
+++ b/lib/mobilizon_web/schema.ex
@@ -21,6 +21,8 @@ defmodule MobilizonWeb.Schema do
   import_types(MobilizonWeb.Schema.CommentType)
   import_types(MobilizonWeb.Schema.SearchType)
   import_types(MobilizonWeb.Schema.ConfigType)
+  import_types(MobilizonWeb.Schema.ReportType)
+  import_types(MobilizonWeb.Schema.AdminType)
 
   @desc "A struct containing the id of the deleted object"
   object :deleted_object do
@@ -109,6 +111,8 @@ defmodule MobilizonWeb.Schema do
     import_fields(:address_queries)
     import_fields(:config_queries)
     import_fields(:picture_queries)
+    import_fields(:report_queries)
+    import_fields(:admin_queries)
   end
 
   @desc """
@@ -124,5 +128,6 @@ defmodule MobilizonWeb.Schema do
     import_fields(:member_mutations)
     import_fields(:feed_token_mutations)
     import_fields(:picture_mutations)
+    import_fields(:report_mutations)
   end
 end
diff --git a/lib/mobilizon_web/schema/admin.ex b/lib/mobilizon_web/schema/admin.ex
new file mode 100644
index 000000000..fa73ec0a9
--- /dev/null
+++ b/lib/mobilizon_web/schema/admin.ex
@@ -0,0 +1,41 @@
+defmodule MobilizonWeb.Schema.AdminType do
+  @moduledoc """
+  Schema representation for ActionLog
+  """
+  use Absinthe.Schema.Notation
+  alias MobilizonWeb.Resolvers.Admin
+  alias Mobilizon.Reports.{Report, Note}
+
+  @desc "An action log"
+  object :action_log do
+    field(:id, :id, description: "Internal ID for this comment")
+    field(:actor, :actor, description: "The actor that acted")
+    field(:object, :action_log_object, description: "The object that was acted upon")
+    field(:action, :string, description: "The action that was done")
+  end
+
+  @desc "The objects that can be in an action log"
+  interface :action_log_object do
+    field(:id, :id, description: "Internal ID for this object")
+
+    resolve_type(fn
+      %Report{}, _ ->
+        :report
+
+      %Note{}, _ ->
+        :report_note
+
+      _, _ ->
+        nil
+    end)
+  end
+
+  object :admin_queries do
+    @desc "Get the list of action logs"
+    field :action_logs, type: list_of(:action_log) do
+      arg(:page, :integer, default_value: 1)
+      arg(:limit, :integer, default_value: 10)
+      resolve(&Admin.list_action_logs/3)
+    end
+  end
+end
diff --git a/lib/mobilizon_web/schema/report.ex b/lib/mobilizon_web/schema/report.ex
new file mode 100644
index 000000000..ea3a5cdaf
--- /dev/null
+++ b/lib/mobilizon_web/schema/report.ex
@@ -0,0 +1,86 @@
+defmodule MobilizonWeb.Schema.ReportType do
+  @moduledoc """
+  Schema representation for User
+  """
+  use Absinthe.Schema.Notation
+
+  alias MobilizonWeb.Resolvers.Report
+
+  @desc "A report object"
+  object :report do
+    interfaces([:action_log_object])
+    field(:id, :id, description: "The internal ID of the report")
+    field(:content, :string, description: "The comment the reporter added about this report")
+    field(:status, :report_status, description: "Whether the report is still active")
+    field(:uri, :string, description: "The URI of the report")
+    field(:reported, :actor, description: "The actor that is being reported")
+    field(:reporter, :actor, description: "The actor that created the report")
+    field(:event, :event, description: "The event that is being reported")
+    field(:comments, list_of(:comment), description: "The comments that are reported")
+  end
+
+  @desc "A report note object"
+  object :report_note do
+    interfaces([:action_log_object])
+    field(:id, :id, description: "The internal ID of the report note")
+    field(:content, :string, description: "The content of the note")
+    field(:moderator, :actor, description: "The moderator who added the note")
+    field(:report, :report, description: "The report on which this note is added")
+  end
+
+  @desc "The list of possible statuses for a report object"
+  enum :report_status do
+    value(:open, description: "The report has been opened")
+    value(:closed, description: "The report has been closed")
+    value(:resolved, description: "The report has been marked as resolved")
+  end
+
+  object :report_queries do
+    @desc "Get all reports"
+    field :reports, list_of(:report) do
+      arg(:page, :integer, default_value: 1)
+      arg(:limit, :integer, default_value: 10)
+      resolve(&Report.list_reports/3)
+    end
+
+    @desc "Get a report by id"
+    field :report, :report do
+      arg(:id, non_null(:id))
+      resolve(&Report.get_report/3)
+    end
+  end
+
+  object :report_mutations do
+    @desc "Create a report"
+    field :create_report, type: :report do
+      arg(:report_content, :string)
+      arg(:reporter_actor_id, non_null(:id))
+      arg(:reported_actor_id, non_null(:id))
+      arg(:event_id, :id, default_value: nil)
+      arg(:comments_ids, list_of(:id), default_value: [])
+      resolve(&Report.create_report/3)
+    end
+
+    @desc "Update a report"
+    field :update_report_status, type: :report do
+      arg(:report_id, non_null(:id))
+      arg(:moderator_id, non_null(:id))
+      arg(:status, non_null(:report_status))
+      resolve(&Report.update_report/3)
+    end
+
+    @desc "Create a note on a report"
+    field :create_report_note, type: :report_note do
+      arg(:content, :string)
+      arg(:moderator_id, non_null(:id))
+      arg(:report_id, non_null(:id))
+      resolve(&Report.create_report_note/3)
+    end
+
+    field :delete_report_note, type: :deleted_object do
+      arg(:note_id, non_null(:id))
+      arg(:moderator_id, non_null(:id))
+      resolve(&Report.delete_report_note/3)
+    end
+  end
+end
diff --git a/lib/mobilizon_web/templates/email/report.html.eex b/lib/mobilizon_web/templates/email/report.html.eex
new file mode 100644
index 000000000..3740eea67
--- /dev/null
+++ b/lib/mobilizon_web/templates/email/report.html.eex
@@ -0,0 +1,15 @@
+<h1><%= gettext "New report from %{reporter} on %{instance}", reporter: @report.reporter, instance: @instance %></h1>
+
+<% if @report.event do %>
+<p><%= gettext "Event: %{event}", event: @report.event %></p>
+<% end %>
+
+<%= for comment <- @report.comments do %>
+<p><%= gettext "Comment: %{comment}", comment: comment %></p>
+<% end %>
+
+<% if @content do %>
+<p><%= gettext "Reason: %{content}", event: @report.content %></p>
+<% end %>
+
+<p><%= link "View the report", to: MobilizonWeb.Endpoint.url() <> "/reports/#{@report.id}", target: "_blank" %></p>
diff --git a/lib/mobilizon_web/templates/email/report.text.eex b/lib/mobilizon_web/templates/email/report.text.eex
new file mode 100644
index 000000000..af4233ece
--- /dev/null
+++ b/lib/mobilizon_web/templates/email/report.text.eex
@@ -0,0 +1,19 @@
+<%= gettext "New report from %{reporter} on %{instance}", reporter: @report.reporter, instance: @instance %>
+
+--
+
+<% if @report.event do %>
+    <%= gettext "Event: %{event}", event: @report.event %>
+<% end %>
+
+<%= for comment <- @report.comments do %>
+<%= gettext "Comment: %{comment}", comment: comment %>
+<% end %>
+
+<% if @content do %>
+<%= gettext "Reason: %{content}", event: @report.content %>
+<% end %>
+
+<%= link "View the report", to: MobilizonWeb.Endpoint.url() <> "/reports/#{@report.id}", target: "_blank" %>
+
+
diff --git a/lib/service/activity_pub/activity_pub.ex b/lib/service/activity_pub/activity_pub.ex
index d93ab20a0..be66b630b 100644
--- a/lib/service/activity_pub/activity_pub.ex
+++ b/lib/service/activity_pub/activity_pub.ex
@@ -41,7 +41,7 @@ defmodule Mobilizon.Service.ActivityPub do
   @spec insert(map(), boolean()) :: {:ok, %Activity{}} | {:error, any()}
   def insert(map, local \\ true) when is_map(map) do
     with map <- lazy_put_activity_defaults(map),
-         :ok <- insert_full_object(map) do
+         {:ok, object} <- insert_full_object(map) do
       object_id = if is_map(map["object"]), do: map["object"]["id"], else: map["id"]
 
       map = if local, do: Map.put(map, "id", "#{object_id}/activity"), else: map
@@ -55,7 +55,7 @@ defmodule Mobilizon.Service.ActivityPub do
 
       # Notification.create_notifications(activity)
       # stream_out(activity)
-      {:ok, activity}
+      {:ok, activity, object}
     else
       %Activity{} = activity -> {:ok, activity}
       error -> {:error, error}
@@ -130,7 +130,7 @@ defmodule Mobilizon.Service.ActivityPub do
              additional
            ),
          :ok <- Logger.debug(inspect(create_data)),
-         {:ok, activity} <- insert(create_data, local),
+         {:ok, activity, _object} <- insert(create_data, local),
          :ok <- maybe_federate(activity) do
       # {:ok, actor} <- Actors.increase_event_count(actor) do
       {:ok, activity}
@@ -147,7 +147,7 @@ defmodule Mobilizon.Service.ActivityPub do
     local = !(params[:local] == false)
 
     with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
-         {:ok, activity} <- insert(data, local),
+         {:ok, activity, _object} <- insert(data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     end
@@ -164,7 +164,7 @@ defmodule Mobilizon.Service.ActivityPub do
            "actor" => actor,
            "object" => object
          },
-         {:ok, activity} <- insert(data, local),
+         {:ok, activity, _object} <- insert(data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     end
@@ -179,7 +179,7 @@ defmodule Mobilizon.Service.ActivityPub do
   #     ) do
   #   with nil <- get_existing_like(url, object),
   #        like_data <- make_like_data(user, object, activity_id),
-  #        {:ok, activity} <- insert(like_data, local),
+  #        {:ok, activity, _object} <- insert(like_data, local),
   #        {:ok, object} <- add_like_to_object(activity, object),
   #        :ok <- maybe_federate(activity) do
   #     {:ok, activity, object}
@@ -197,7 +197,7 @@ defmodule Mobilizon.Service.ActivityPub do
   #     ) do
   #   with %Activity{} = like_activity <- get_existing_like(actor.ap_id, object),
   #        unlike_data <- make_unlike_data(actor, like_activity, activity_id),
-  #        {:ok, unlike_activity} <- insert(unlike_data, local),
+  #        {:ok, unlike_activity, _object} <- insert(unlike_data, local),
   #        {:ok, _activity} <- Repo.delete(like_activity),
   #        {:ok, object} <- remove_like_from_object(like_activity, object),
   #        :ok <- maybe_federate(unlike_activity) do
@@ -215,7 +215,7 @@ defmodule Mobilizon.Service.ActivityPub do
   #     ) do
   #   #with true <- is_public?(object),
   #        with announce_data <- make_announce_data(actor, object, activity_id),
-  #        {:ok, activity} <- insert(announce_data, local),
+  #        {:ok, activity, _object} <- insert(announce_data, local),
   #       #  {:ok, object} <- add_announce_to_object(activity, object),
   #        :ok <- maybe_federate(activity) do
   #     {:ok, activity, object}
@@ -232,7 +232,7 @@ defmodule Mobilizon.Service.ActivityPub do
   #     ) do
   #   with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object),
   #        unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
-  #        {:ok, unannounce_activity} <- insert(unannounce_data, local),
+  #        {:ok, unannounce_activity, _object} <- insert(unannounce_data, local),
   #        :ok <- maybe_federate(unannounce_activity),
   #        {:ok, _activity} <- Repo.delete(announce_activity),
   #        {:ok, object} <- remove_announce_from_object(announce_activity, object) do
@@ -250,7 +250,7 @@ defmodule Mobilizon.Service.ActivityPub do
          activity_follow_id <-
            activity_id || "#{MobilizonWeb.Endpoint.url()}/follow/#{follow_id}/activity",
          data <- make_follow_data(followed, follower, activity_follow_id),
-         {:ok, activity} <- insert(data, local),
+         {:ok, activity, _object} <- insert(data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     else
@@ -267,9 +267,9 @@ defmodule Mobilizon.Service.ActivityPub do
     with {:ok, %Follower{id: follow_id}} <- Actor.unfollow(followed, follower),
          # We recreate the follow activity
          data <- make_follow_data(followed, follower, follow_id),
-         {:ok, follow_activity} <- insert(data, local),
+         {:ok, follow_activity, _object} <- insert(data, local),
          unfollow_data <- make_unfollow_data(follower, followed, follow_activity, activity_id),
-         {:ok, activity} <- insert(unfollow_data, local),
+         {:ok, activity, _object} <- insert(unfollow_data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     else
@@ -290,7 +290,7 @@ defmodule Mobilizon.Service.ActivityPub do
     }
 
     with Events.delete_event(event),
-         {:ok, activity} <- insert(data, local),
+         {:ok, activity, _object} <- insert(data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     end
@@ -305,7 +305,7 @@ defmodule Mobilizon.Service.ActivityPub do
     }
 
     with Events.delete_comment(comment),
-         {:ok, activity} <- insert(data, local),
+         {:ok, activity, _object} <- insert(data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     end
@@ -320,12 +320,33 @@ defmodule Mobilizon.Service.ActivityPub do
     }
 
     with Actors.delete_actor(actor),
-         {:ok, activity} <- insert(data, local),
+         {:ok, activity, _object} <- insert(data, local),
          :ok <- maybe_federate(activity) do
       {:ok, activity}
     end
   end
 
+  def flag(params) do
+    # only accept false as false value
+    local = !(params[:local] == false)
+    forward = !(params[:forward] == false)
+
+    additional = params[:additional] || %{}
+
+    additional =
+      if forward do
+        Map.merge(additional, %{"to" => [], "cc" => [params.reported_actor_url]})
+      else
+        Map.merge(additional, %{"to" => [], "cc" => []})
+      end
+
+    with flag_data <- make_flag_data(params, additional),
+         {:ok, activity, report} <- insert(flag_data, local),
+         :ok <- maybe_federate(activity) do
+      {:ok, activity, report}
+    end
+  end
+
   @doc """
   Create an actor locally by it's URL (AP ID)
   """
diff --git a/lib/service/activity_pub/converters/flag.ex b/lib/service/activity_pub/converters/flag.ex
new file mode 100644
index 000000000..1a8fff623
--- /dev/null
+++ b/lib/service/activity_pub/converters/flag.ex
@@ -0,0 +1,85 @@
+defmodule Mobilizon.Service.ActivityPub.Converters.Flag do
+  @moduledoc """
+  Flag converter
+
+  This module allows to convert reports from ActivityStream format to our own internal one, and back.
+
+  Note: Reports are named Flag in AS.
+  """
+  alias Mobilizon.Actors
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Events
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Reports.Report
+  alias Mobilizon.Service.ActivityPub.Converter
+
+  @behaviour Converter
+
+  @doc """
+  Converts an AP object data to our internal data structure
+  """
+  @impl Converter
+  @spec as_to_model_data(map()) :: map()
+  def as_to_model_data(object) do
+    with params <- as_to_model(object) do
+      %{
+        "reporter_id" => params["reporter"].id,
+        "uri" => params["uri"],
+        "content" => params["content"],
+        "reported_id" => params["reported"].id,
+        "event_id" => (!is_nil(params["event"]) && params["event"].id) || nil,
+        "comments" => params["comments"]
+      }
+    end
+  end
+
+  def as_to_model(%{"object" => objects} = object) do
+    with {:ok, %Actor{} = reporter} <- Actors.get_actor_by_url(object["actor"]),
+         %Actor{} = reported <-
+           Enum.reduce_while(objects, nil, fn url, _ ->
+             with {:ok, %Actor{} = actor} <- Actors.get_actor_by_url(url) do
+               {:halt, actor}
+             else
+               _ -> {:cont, nil}
+             end
+           end),
+         event <-
+           Enum.reduce_while(objects, nil, fn url, _ ->
+             with %Event{} = event <- Events.get_event_by_url(url) do
+               {:halt, event}
+             else
+               _ -> {:cont, nil}
+             end
+           end),
+
+         # Remove the reported user from the object list.
+         comments <-
+           Enum.filter(objects, fn url ->
+             !(url == reported.url || (!is_nil(event) && event.url == url))
+           end),
+         comments <- Enum.map(comments, &Events.get_comment_from_url/1) do
+      %{
+        "reporter" => reporter,
+        "uri" => object["id"],
+        "content" => object["content"],
+        "reported" => reported,
+        "event" => event,
+        "comments" => comments
+      }
+    end
+  end
+
+  @doc """
+  Convert an event struct to an ActivityStream representation
+  """
+  @impl Converter
+  @spec model_to_as(EventModel.t()) :: map()
+  def model_to_as(%Report{} = report) do
+    %{
+      "type" => "Flag",
+      "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+      "actor" => report.reporter.url,
+      "id" => report.url
+    }
+  end
+end
diff --git a/lib/service/activity_pub/transmogrifier.ex b/lib/service/activity_pub/transmogrifier.ex
index d11d60613..b35dc76ac 100644
--- a/lib/service/activity_pub/transmogrifier.ex
+++ b/lib/service/activity_pub/transmogrifier.ex
@@ -116,6 +116,22 @@ defmodule Mobilizon.Service.ActivityPub.Transmogrifier do
     |> Map.put("tag", combined)
   end
 
+  def handle_incoming(%{"type" => "Flag"} = data) do
+    with params <- Mobilizon.Service.ActivityPub.Converters.Flag.as_to_model(data) do
+      params = %{
+        reporter_url: params["reporter"].url,
+        reported_actor_url: params["reported"].url,
+        comments_url: params["comments"] |> Enum.map(& &1.url),
+        content: params["content"] || "",
+        additional: %{
+          "cc" => [params["reported"].url]
+        }
+      }
+
+      ActivityPub.flag(params)
+    end
+  end
+
   # TODO: validate those with a Ecto scheme
   # - tags
   # - emoji
diff --git a/lib/service/activity_pub/utils.ex b/lib/service/activity_pub/utils.ex
index 7c02e82a9..47a40c959 100644
--- a/lib/service/activity_pub/utils.ex
+++ b/lib/service/activity_pub/utils.ex
@@ -18,6 +18,10 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
   alias Mobilizon.Media.Picture
   alias Mobilizon.Events
   alias Mobilizon.Activity
+  alias Mobilizon.Reports
+  alias Mobilizon.Reports.Report
+  alias Mobilizon.Users
+  alias Mobilizon.Service.ActivityPub.Converters
   alias Ecto.Changeset
   require Logger
   alias MobilizonWeb.Router.Helpers, as: Routes
@@ -119,9 +123,9 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
   def insert_full_object(%{"object" => %{"type" => "Event"} = object_data})
       when is_map(object_data) do
     with object_data <-
-           Mobilizon.Service.ActivityPub.Converters.Event.as_to_model_data(object_data),
-         {:ok, _} <- Events.create_event(object_data) do
-      :ok
+           Converters.Event.as_to_model_data(object_data),
+         {:ok, %Event{} = event} <- Events.create_event(object_data) do
+      {:ok, event}
     end
   end
 
@@ -129,8 +133,8 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
       when is_map(object_data) do
     with object_data <-
            Map.put(object_data, "preferred_username", object_data["preferredUsername"]),
-         {:ok, _} <- Actors.create_group(object_data) do
-      :ok
+         {:ok, %Actor{} = group} <- Actors.create_group(object_data) do
+      {:ok, group}
     end
   end
 
@@ -139,9 +143,9 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
   """
   def insert_full_object(%{"object" => %{"type" => "Note"} = object_data})
       when is_map(object_data) do
-    with data <- Mobilizon.Service.ActivityPub.Converters.Comment.as_to_model_data(object_data),
-         {:ok, _comment} <- Events.create_comment(data) do
-      :ok
+    with data <- Converters.Comment.as_to_model_data(object_data),
+         {:ok, %Comment{} = comment} <- Events.create_comment(data) do
+      {:ok, comment}
     else
       err ->
         Logger.error("Error while inserting a remote comment inside database")
@@ -150,7 +154,29 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
     end
   end
 
-  def insert_full_object(_), do: :ok
+  @doc """
+  Inserts a full object if it is contained in an activity.
+  """
+  def insert_full_object(%{"type" => "Flag"} = object_data)
+      when is_map(object_data) do
+    with data <- Converters.Flag.as_to_model_data(object_data),
+         {:ok, %Report{} = report} <- Reports.create_report(data) do
+      Enum.each(Users.list_moderators(), fn moderator ->
+        moderator
+        |> Mobilizon.Email.Admin.report(moderator, report)
+        |> Mobilizon.Mailer.deliver_later()
+      end)
+
+      {:ok, report}
+    else
+      err ->
+        Logger.error("Error while inserting a remote comment inside database")
+        Logger.error(inspect(err))
+        {:error, err}
+    end
+  end
+
+  def insert_full_object(_), do: {:ok, nil}
 
   #### Like-related helpers
 
@@ -497,6 +523,24 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
     |> Map.merge(additional)
   end
 
+  #### Flag-related helpers
+  @spec make_flag_data(map(), map()) :: map()
+  def make_flag_data(params, additional) do
+    object = [params.reported_actor_url] ++ params.comments_url
+
+    object = if params[:event_url], do: object ++ [params.event_url], else: object
+
+    %{
+      "type" => "Flag",
+      "id" => "#{MobilizonWeb.Endpoint.url()}/report/#{Ecto.UUID.generate()}",
+      "actor" => params.reporter_url,
+      "content" => params.content,
+      "object" => object,
+      "state" => "open"
+    }
+    |> Map.merge(additional)
+  end
+
   @doc """
   Converts PEM encoded keys to a public key representation
   """
diff --git a/lib/service/admin/action_log_service.ex b/lib/service/admin/action_log_service.ex
new file mode 100644
index 000000000..b1a636853
--- /dev/null
+++ b/lib/service/admin/action_log_service.ex
@@ -0,0 +1,30 @@
+defmodule Mobilizon.Service.Admin.ActionLogService do
+  @moduledoc """
+  Module to handle action log creations
+  """
+
+  alias Mobilizon.Users
+  alias Mobilizon.Users.User
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Admin
+  alias Mobilizon.Admin.ActionLog
+
+  @doc """
+  Log an admin action
+  """
+  @spec log_action(Actor.t(), String.t(), String.t()) :: {:ok, ActionLog.t()}
+  def log_action(%Actor{user_id: user_id, id: actor_id}, action, target) do
+    with %User{role: role} <- Users.get_user!(user_id),
+         {:role, true} <- {:role, role in [:administrator, :moderator]},
+         {:ok, %ActionLog{} = create_action_log} <-
+           Admin.create_action_log(%{
+             "actor_id" => actor_id,
+             "target_type" => to_string(target.__struct__),
+             "target_id" => target.id,
+             "action" => action,
+             "changes" => Map.from_struct(target) |> Map.take([:status, :uri, :content])
+           }) do
+      {:ok, create_action_log}
+    end
+  end
+end
diff --git a/priv/repo/migrations/20190712125833_create_reports.exs b/priv/repo/migrations/20190712125833_create_reports.exs
new file mode 100644
index 000000000..ce466b3e9
--- /dev/null
+++ b/priv/repo/migrations/20190712125833_create_reports.exs
@@ -0,0 +1,33 @@
+defmodule Mobilizon.Repo.Migrations.CreateReports do
+  use Ecto.Migration
+  alias Mobilizon.Reports.ReportStateEnum
+
+  def up do
+    ReportStateEnum.create_type()
+
+    create table(:reports) do
+      add(:content, :string)
+      add(:status, ReportStateEnum.type(), default: "open", null: false)
+      add(:uri, :string, null: false)
+
+      add(:reported_id, references(:actors, on_delete: :delete_all), null: false)
+      add(:reporter_id, references(:actors, on_delete: :delete_all), null: false)
+      add(:manager_id, references(:actors, on_delete: :delete_all), null: true)
+      add(:event_id, references(:events, on_delete: :delete_all), null: true)
+
+      timestamps()
+    end
+
+    create table(:reports_comments, primary_key: false) do
+      add(:report_id, references(:reports, on_delete: :delete_all), null: false)
+      add(:comment_id, references(:comments, on_delete: :delete_all), null: false)
+    end
+  end
+
+  def down do
+    drop(table(:reports_comments))
+    drop(table(:reports))
+
+    ReportStateEnum.drop_type()
+  end
+end
diff --git a/priv/repo/migrations/20190712132438_create_report_notes.exs b/priv/repo/migrations/20190712132438_create_report_notes.exs
new file mode 100644
index 000000000..cd4ea63c6
--- /dev/null
+++ b/priv/repo/migrations/20190712132438_create_report_notes.exs
@@ -0,0 +1,13 @@
+defmodule Mobilizon.Repo.Migrations.CreateReportNotes do
+  use Ecto.Migration
+
+  def change do
+    create table(:report_notes) do
+      add(:content, :string, null: false)
+      add(:moderator_id, references(:actors, on_delete: :delete_all), null: false)
+      add(:report_id, references(:reports, on_delete: :delete_all), null: false)
+
+      timestamps()
+    end
+  end
+end
diff --git a/priv/repo/migrations/20190718122556_create_admin_action_logs.exs b/priv/repo/migrations/20190718122556_create_admin_action_logs.exs
new file mode 100644
index 000000000..00af8f2ba
--- /dev/null
+++ b/priv/repo/migrations/20190718122556_create_admin_action_logs.exs
@@ -0,0 +1,15 @@
+defmodule Mobilizon.Repo.Migrations.CreateAdminActionLogs do
+  use Ecto.Migration
+
+  def change do
+    create table(:admin_action_logs) do
+      add(:action, :string, null: false)
+      add(:target_type, :string, null: false)
+      add(:target_id, :int, null: false)
+      add(:changes, :map)
+      add(:actor_id, references(:actors, on_delete: :nilify_all), null: false)
+
+      timestamps()
+    end
+  end
+end
diff --git a/test/mobilizon/service/activity_pub/transmogrifier_test.exs b/test/mobilizon/service/activity_pub/transmogrifier_test.exs
index 7ff664ecb..ffd8b32cf 100644
--- a/test/mobilizon/service/activity_pub/transmogrifier_test.exs
+++ b/test/mobilizon/service/activity_pub/transmogrifier_test.exs
@@ -676,6 +676,29 @@ defmodule Mobilizon.Service.ActivityPub.TransmogrifierTest do
 
     #       :error = Transmogrifier.handle_incoming(data)
     #     end
+
+    test "it accepts Flag activities" do
+      %Actor{url: reporter_url} = _reporter = insert(:actor)
+      %Actor{url: reported_url} = reported = insert(:actor)
+
+      %Comment{url: comment_url} = _comment = insert(:comment, actor: reported)
+
+      message = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "cc" => [reported_url],
+        "object" => [reported_url, comment_url],
+        "type" => "Flag",
+        "content" => "blocked AND reported!!!",
+        "actor" => reporter_url
+      }
+
+      assert {:ok, activity, _} = Transmogrifier.handle_incoming(message)
+
+      assert activity.data["object"] == [reported_url, comment_url]
+      assert activity.data["content"] == "blocked AND reported!!!"
+      assert activity.data["actor"] == reporter_url
+      assert activity.data["cc"] == [reported_url]
+    end
   end
 
   describe "prepare outgoing" do
diff --git a/test/mobilizon/service/admin/action_log_service_test.exs b/test/mobilizon/service/admin/action_log_service_test.exs
new file mode 100644
index 000000000..ccdfba86b
--- /dev/null
+++ b/test/mobilizon/service/admin/action_log_service_test.exs
@@ -0,0 +1,43 @@
+defmodule Mobilizon.Service.Admin.ActionLogServiceTest do
+  @moduledoc """
+  Test the ActionLogService module
+  """
+  use Mobilizon.DataCase
+  import Mobilizon.Service.Admin.ActionLogService
+  alias Mobilizon.Reports.{Report, Note}
+  alias Mobilizon.Admin.ActionLog
+  import Mobilizon.Factory
+
+  setup do
+    moderator_user = insert(:user, role: :moderator)
+    moderator_actor = insert(:actor, user: moderator_user)
+    {:ok, moderator: moderator_actor}
+  end
+
+  describe "action_log_creation" do
+    test "log a report update", %{moderator: moderator} do
+      %Report{id: _report_id} = report = insert(:report)
+
+      assert {:ok,
+              %ActionLog{
+                target_type: "Elixir.Mobilizon.Reports.Report",
+                target_id: report_id,
+                action: "update",
+                actor: moderator
+              }} = log_action(moderator, "update", report)
+    end
+
+    test "log the creation of a report note", %{moderator: moderator} do
+      %Report{} = report = insert(:report)
+      %Note{id: _note_id} = report = insert(:report_note, report: report)
+
+      assert {:ok,
+              %ActionLog{
+                target_type: "Elixir.Mobilizon.Reports.Note",
+                target_id: note_id,
+                action: "create",
+                actor: moderator
+              }} = log_action(moderator, "create", report)
+    end
+  end
+end
diff --git a/test/mobilizon_web/api/report_test.exs b/test/mobilizon_web/api/report_test.exs
new file mode 100644
index 000000000..fa547024b
--- /dev/null
+++ b/test/mobilizon_web/api/report_test.exs
@@ -0,0 +1,217 @@
+defmodule MobilizonWeb.API.ReportTest do
+  use Mobilizon.DataCase
+
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Events.Comment
+  alias Mobilizon.Actors.Actor
+  alias MobilizonWeb.API.Reports
+  alias Mobilizon.Reports.{Report, Note}
+  alias Mobilizon.Activity
+  alias Mobilizon.Users.User
+  alias Mobilizon.Users
+
+  import Mobilizon.Factory
+
+  describe "reports" do
+    test "creates a report on a event" do
+      %Actor{id: reporter_id, url: reporter_url} = insert(:actor)
+      %Actor{id: reported_id, url: reported_url} = reported = insert(:actor)
+
+      %Event{id: event_id, url: event_url} = _event = insert(:event, organizer_actor: reported)
+
+      comment = "This is not acceptable"
+
+      assert {:ok, %Activity{} = flag_activity, _} =
+               Reports.report(%{
+                 reporter_actor_id: reporter_id,
+                 reported_actor_id: reported_id,
+                 report_content: comment,
+                 event_id: event_id,
+                 comments_ids: []
+               })
+
+      assert %Activity{
+               actor: ^reporter_url,
+               data: %{
+                 "type" => "Flag",
+                 "cc" => [],
+                 "content" => ^comment,
+                 "object" => [^reported_url, ^event_url],
+                 "state" => "open"
+               }
+             } = flag_activity
+    end
+
+    test "creates a report on several comments" do
+      %Actor{id: reporter_id, url: reporter_url} = insert(:actor)
+      %Actor{id: reported_id, url: reported_url} = reported = insert(:actor)
+
+      %Comment{id: comment_1_id, url: comment_1_url} =
+        _comment_1 = insert(:comment, actor: reported)
+
+      %Comment{id: comment_2_id, url: comment_2_url} =
+        _comment_2 = insert(:comment, actor: reported)
+
+      comment = "This is really not acceptable"
+
+      assert {:ok, %Activity{} = flag_activity, _} =
+               Reports.report(%{
+                 reporter_actor_id: reporter_id,
+                 reported_actor_id: reported_id,
+                 report_content: comment,
+                 event_id: nil,
+                 comments_ids: [comment_1_id, comment_2_id]
+               })
+
+      assert %Activity{
+               actor: ^reporter_url,
+               data: %{
+                 "type" => "Flag",
+                 "cc" => [],
+                 "content" => ^comment,
+                 "object" => [^reported_url, ^comment_1_url, ^comment_2_url],
+                 "state" => "open"
+               }
+             } = flag_activity
+    end
+
+    test "creates a report that gets federated" do
+      %Actor{id: reporter_id, url: reporter_url} = insert(:actor)
+      %Actor{id: reported_id, url: reported_url} = reported = insert(:actor)
+
+      %Comment{id: comment_1_id, url: comment_1_url} =
+        _comment_1 = insert(:comment, actor: reported)
+
+      %Comment{id: comment_2_id, url: comment_2_url} =
+        _comment_2 = insert(:comment, actor: reported)
+
+      comment = "This is really not acceptable, remote admin I don't know"
+      encoded_comment = Mobilizon.Service.Formatter.html_escape(comment, "text/plain")
+
+      assert {:ok, %Activity{} = flag_activity, _} =
+               Reports.report(%{
+                 reporter_actor_id: reporter_id,
+                 reported_actor_id: reported_id,
+                 report_content: comment,
+                 event_id: nil,
+                 comments_ids: [comment_1_id, comment_2_id],
+                 forward: true
+               })
+
+      assert %Activity{
+               actor: ^reporter_url,
+               data: %{
+                 "type" => "Flag",
+                 "actor" => ^reporter_url,
+                 "cc" => [^reported_url],
+                 "content" => ^encoded_comment,
+                 "object" => [^reported_url, ^comment_1_url, ^comment_2_url],
+                 "state" => "open"
+               }
+             } = flag_activity
+    end
+
+    test "updates report state" do
+      %Actor{id: reporter_id} = insert(:actor)
+      %Actor{id: reported_id} = reported = insert(:actor)
+
+      %Comment{id: comment_1_id} = _comment_1 = insert(:comment, actor: reported)
+
+      assert {:ok, %Activity{} = flag_activity, %Report{id: report_id} = _report} =
+               Reports.report(%{
+                 reporter_actor_id: reporter_id,
+                 reported_actor_id: reported_id,
+                 report_content: "This is not a nice thing",
+                 event_id: nil,
+                 comments_ids: [comment_1_id],
+                 forward: true
+               })
+
+      %Report{} = report = Mobilizon.Reports.get_report(report_id)
+
+      %User{} = manager_user = insert(:user, role: :moderator)
+      %Actor{} = manager_actor = insert(:actor, user: manager_user)
+
+      {:ok, new_report} = Reports.update_report_status(manager_actor, report, :resolved)
+
+      assert new_report.status == :resolved
+    end
+
+    test "updates report state with not acceptable status" do
+      %Actor{id: reporter_id} = insert(:actor)
+      %Actor{id: reported_id} = reported = insert(:actor)
+
+      %Comment{id: comment_1_id} = _comment_1 = insert(:comment, actor: reported)
+
+      assert {:ok, %Activity{} = flag_activity, %Report{id: report_id} = _report} =
+               Reports.report(%{
+                 reporter_actor_id: reporter_id,
+                 reported_actor_id: reported_id,
+                 report_content: "This is not a nice thing",
+                 event_id: nil,
+                 comments_ids: [comment_1_id],
+                 forward: true
+               })
+
+      %Report{} = report = Mobilizon.Reports.get_report(report_id)
+
+      %Actor{} = manager_actor = insert(:actor)
+
+      {:error, "Unsupported state"} = Reports.update_report_status(manager_actor, report, :test)
+    end
+  end
+
+  describe "note reports" do
+    test "creates a note on a report" do
+      %User{} = moderator_user = insert(:user, role: :moderator)
+      %Actor{} = moderator_actor = insert(:actor, user: moderator_user)
+      %Report{} = report = insert(:report)
+
+      assert {:ok, %Note{} = _note} =
+               Reports.create_report_note(
+                 report,
+                 moderator_actor,
+                 "I'll take care of this later today"
+               )
+    end
+
+    test "doesn't create a note on a report when not moderator" do
+      %User{} = user = insert(:user)
+      %Actor{} = actor = insert(:actor, user: user)
+      %Report{} = report = insert(:report)
+
+      assert {:error,
+              "You need to be a moderator or an administrator to create a note on a report"} =
+               Reports.create_report_note(report, actor, "I'll take care of this later today")
+    end
+
+    test "deletes a note on a report" do
+      %User{} = moderator_user = insert(:user, role: :moderator)
+      %Actor{} = moderator_actor = insert(:actor, user: moderator_user)
+      %Note{} = note = insert(:report_note, moderator: moderator_actor)
+      assert {:ok, %Note{}} = Reports.delete_report_note(note, moderator_actor)
+    end
+
+    test "deletes a note on a report with a different moderator actor" do
+      %Note{} = note = insert(:report_note)
+
+      %User{} = other_moderator_user = insert(:user, role: :moderator)
+      %Actor{} = other_moderator_actor = insert(:actor, user: other_moderator_user)
+
+      assert {:error, "You can only remove your own notes"} =
+               Reports.delete_report_note(note, other_moderator_actor)
+    end
+
+    test "try deletes a note on a report with a actor not moderator anymore" do
+      %User{} = moderator_user = insert(:user, role: :moderator)
+      %Actor{} = moderator_actor = insert(:actor, user: moderator_user)
+      %Note{} = note = insert(:report_note, moderator: moderator_actor)
+
+      Users.update_user(moderator_user, %{role: :user})
+
+      assert {:error,
+              "You need to be a moderator or an administrator to create a note on a report"} =
+               Reports.delete_report_note(note, moderator_actor)
+    end
+  end
+end
diff --git a/test/mobilizon_web/resolvers/admin_resolver_test.exs b/test/mobilizon_web/resolvers/admin_resolver_test.exs
new file mode 100644
index 000000000..150cb7bc4
--- /dev/null
+++ b/test/mobilizon_web/resolvers/admin_resolver_test.exs
@@ -0,0 +1,82 @@
+defmodule MobilizonWeb.Resolvers.AdminResolverTest do
+  alias MobilizonWeb.AbsintheHelpers
+  use MobilizonWeb.ConnCase
+  import Mobilizon.Factory
+
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Users.User
+  alias Mobilizon.Reports.{Report, Note}
+
+  describe "Resolver: List the action logs" do
+    @note_content "This a note on a report"
+    test "list_action_logs/3 list action logs", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+      %Actor{} = moderator = insert(:actor, user: user_moderator)
+
+      %User{} = user_moderator_2 = insert(:user, role: :moderator)
+      %Actor{} = moderator_2 = insert(:actor, user: user_moderator_2)
+
+      %Report{} = report = insert(:report)
+      MobilizonWeb.API.Reports.update_report_status(moderator, report, "resolved")
+
+      {:ok, %Note{} = note} =
+        MobilizonWeb.API.Reports.create_report_note(report, moderator_2, @note_content)
+
+      MobilizonWeb.API.Reports.delete_report_note(note, moderator_2)
+
+      query = """
+      {
+        actionLogs {
+          action,
+          actor {
+            preferredUsername
+          },
+          object {
+            ... on Report {
+              id,
+              status
+            },
+            ... on ReportNote {
+              content
+            }
+          }
+        }
+      }
+      """
+
+      res =
+        conn
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "actionLogs"))
+
+      assert json_response(res, 200)["errors"] |> hd |> Map.get("message") ==
+               "You need to be logged-in and a moderator to list action logs"
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "actionLogs"))
+
+      assert json_response(res, 200)["errors"] == nil
+
+      assert json_response(res, 200)["data"]["actionLogs"] |> length == 3
+
+      assert json_response(res, 200)["data"]["actionLogs"] == [
+               %{
+                 "action" => "report_update_resolved",
+                 "actor" => %{"preferredUsername" => moderator.preferred_username},
+                 "object" => %{"id" => to_string(report.id), "status" => "RESOLVED"}
+               },
+               %{
+                 "action" => "note_creation",
+                 "actor" => %{"preferredUsername" => moderator_2.preferred_username},
+                 "object" => %{"content" => @note_content}
+               },
+               %{
+                 "action" => "note_deletion",
+                 "actor" => %{"preferredUsername" => moderator_2.preferred_username},
+                 "object" => %{"content" => @note_content}
+               }
+             ]
+    end
+  end
+end
diff --git a/test/mobilizon_web/resolvers/report_resolver_test.exs b/test/mobilizon_web/resolvers/report_resolver_test.exs
new file mode 100644
index 000000000..915ccbbe0
--- /dev/null
+++ b/test/mobilizon_web/resolvers/report_resolver_test.exs
@@ -0,0 +1,366 @@
+defmodule MobilizonWeb.Resolvers.ReportResolverTest do
+  alias MobilizonWeb.AbsintheHelpers
+  use MobilizonWeb.ConnCase
+  import Mobilizon.Factory
+
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Users.User
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Reports.{Report, Note}
+
+  describe "Resolver: Report a content" do
+    test "create_report/3 creates a report", %{conn: conn} do
+      %User{} = user_reporter = insert(:user)
+      %Actor{} = reporter = insert(:actor, user: user_reporter)
+      %Actor{} = reported = insert(:actor)
+      %Event{} = event = insert(:event, organizer_actor: reported)
+
+      mutation = """
+          mutation {
+            createReport(
+              reporter_actor_id: #{reporter.id},
+              reported_actor_id: #{reported.id},
+              event_id: #{event.id},
+              report_content: "This is an issue"
+            ) {
+                content,
+                reporter {
+                  id
+                },
+                event {
+                  id
+                },
+                status
+              }
+            }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_reporter)
+        |> post("/api", AbsintheHelpers.mutation_skeleton(mutation))
+
+      assert json_response(res, 200)["errors"] == nil
+      assert json_response(res, 200)["data"]["createReport"]["content"] == "This is an issue"
+      assert json_response(res, 200)["data"]["createReport"]["status"] == "OPEN"
+      assert json_response(res, 200)["data"]["createReport"]["event"]["id"] == event.id
+      assert json_response(res, 200)["data"]["createReport"]["reporter"]["id"] == reporter.id
+    end
+
+    test "create_report/3 without being connected doesn't create any report", %{conn: conn} do
+      %Actor{} = reported = insert(:actor)
+
+      mutation = """
+          mutation {
+            createReport(
+              reported_actor_id: #{reported.id},
+              reporter_actor_id: 5,
+              report_content: "This is an issue"
+            ) {
+                content
+              }
+            }
+      """
+
+      res =
+        conn
+        |> post("/api", AbsintheHelpers.mutation_skeleton(mutation))
+
+      assert json_response(res, 200)["errors"] |> hd |> Map.get("message") ==
+               "You need to be logged-in to create reports"
+    end
+  end
+
+  describe "Resolver: update a report" do
+    test "update_report/3 updates the report's status", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+      %Actor{} = moderator = insert(:actor, user: user_moderator)
+      %Report{} = report = insert(:report)
+
+      mutation = """
+          mutation {
+            updateReportStatus(
+              report_id: #{report.id},
+              moderator_id: #{moderator.id},
+              status: RESOLVED
+            ) {
+                content,
+                reporter {
+                  id
+                },
+                event {
+                  id
+                },
+                status
+              }
+            }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> post("/api", AbsintheHelpers.mutation_skeleton(mutation))
+
+      assert json_response(res, 200)["errors"] == nil
+
+      assert json_response(res, 200)["data"]["updateReportStatus"]["content"] ==
+               "This is problematic"
+
+      assert json_response(res, 200)["data"]["updateReportStatus"]["status"] == "RESOLVED"
+
+      assert json_response(res, 200)["data"]["updateReportStatus"]["reporter"]["id"] ==
+               report.reporter.id
+    end
+
+    test "create_report/3 without being connected doesn't create any report", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+      %Actor{} = moderator = insert(:actor, user: user_moderator)
+      %Report{} = report = insert(:report)
+
+      mutation = """
+          mutation {
+            updateReportStatus(
+              report_id: #{report.id},
+              moderator_id: #{moderator.id},
+              status: RESOLVED
+            ) {
+                content
+              }
+            }
+      """
+
+      res =
+        conn
+        |> post("/api", AbsintheHelpers.mutation_skeleton(mutation))
+
+      assert json_response(res, 200)["errors"] |> hd |> Map.get("message") ==
+               "You need to be logged-in and a moderator to update a report"
+    end
+  end
+
+  describe "Resolver: Get list of reports" do
+    test "get an empty list of reports", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+
+      query = """
+      {
+        reports {
+          id,
+          reported {
+            preferredUsername
+          }
+        }
+      }
+      """
+
+      res =
+        conn
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] |> hd |> Map.get("message") ==
+               "You need to be logged-in and a moderator to list reports"
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] == nil
+      assert json_response(res, 200)["data"]["reports"] == []
+    end
+
+    test "get a list of reports", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+
+      %Report{id: report_1_id} = insert(:report)
+      %Report{id: report_2_id} = insert(:report)
+      %Report{id: report_3_id} = insert(:report)
+
+      query = """
+      {
+        reports {
+          id,
+          reported {
+            preferredUsername
+          }
+        }
+      }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] == nil
+
+      assert json_response(res, 200)["data"]["reports"]
+             |> Enum.map(fn report -> Map.get(report, "id") end) ==
+               Enum.map([report_1_id, report_2_id, report_3_id], &to_string/1)
+
+      query = """
+      {
+        reports(page: 2, limit: 2) {
+          id,
+          reported {
+            preferredUsername
+          }
+        }
+      }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] == nil
+      assert json_response(res, 200)["data"]["reports"] |> length == 1
+
+      query = """
+      {
+        reports(page: 3, limit: 2) {
+          id,
+          reported {
+            preferredUsername
+          }
+        }
+      }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] == nil
+      assert json_response(res, 200)["data"]["reports"] |> length == 0
+    end
+  end
+
+  describe "Resolver: View a report" do
+    test "view a report", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+      %Actor{} = insert(:actor, user: user_moderator)
+      %Actor{} = reporter = insert(:actor)
+      %Report{} = report = insert(:report, reporter: reporter)
+
+      query = """
+      {
+        report (id: "#{report.id}") {
+          id,
+          reported {
+            preferredUsername
+          },
+          reporter {
+            preferredUsername
+          },
+          event {
+            title
+          },
+          comments {
+            text
+          },
+          content
+        }
+      }
+      """
+
+      res =
+        conn
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] |> hd |> Map.get("message") ==
+               "You need to be logged-in and a moderator to view a report"
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> get("/api", AbsintheHelpers.query_skeleton(query, "report"))
+
+      assert json_response(res, 200)["errors"] == nil
+
+      assert json_response(res, 200)["data"]["report"]["reported"]["preferredUsername"] ==
+               report.reported.preferred_username
+
+      assert json_response(res, 200)["data"]["report"]["reporter"]["preferredUsername"] ==
+               reporter.preferred_username
+
+      assert json_response(res, 200)["data"]["report"]["content"] == report.content
+      assert json_response(res, 200)["data"]["report"]["event"]["title"] == report.event.title
+
+      assert json_response(res, 200)["data"]["report"]["comments"] |> hd |> Map.get("text") ==
+               report.comments |> hd |> Map.get(:text)
+    end
+  end
+
+  describe "Resolver: Add a note on a report" do
+    @report_note_content "I agree with this this report"
+
+    test "create_report_note/3 creates a report note", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+      %Actor{id: moderator_id} = moderator = insert(:actor, user: user_moderator)
+      %Report{id: report_id} = insert(:report)
+
+      mutation = """
+          mutation {
+            createReportNote(
+              moderator_id: #{moderator_id},
+              report_id: #{report_id},
+              content: "#{@report_note_content}"
+            ) {
+                content,
+                moderator {
+                  preferred_username
+                },
+                report {
+                  id
+                }
+              }
+            }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> post("/api", AbsintheHelpers.mutation_skeleton(mutation))
+
+      assert json_response(res, 200)["errors"] == nil
+
+      assert json_response(res, 200)["data"]["createReportNote"]["content"] ==
+               @report_note_content
+
+      assert json_response(res, 200)["data"]["createReportNote"]["moderator"][
+               "preferred_username"
+             ] == moderator.preferred_username
+
+      assert json_response(res, 200)["data"]["createReportNote"]["report"]["id"] ==
+               to_string(report_id)
+    end
+
+    test "delete_report_note deletes a report note", %{conn: conn} do
+      %User{} = user_moderator = insert(:user, role: :moderator)
+      %Actor{id: moderator_id} = moderator = insert(:actor, user: user_moderator)
+      %Note{id: report_note_id} = insert(:report_note, moderator: moderator)
+
+      mutation = """
+          mutation {
+            deleteReportNote(
+              moderator_id: #{moderator_id},
+              note_id: #{report_note_id},
+            ) {
+                id
+              }
+            }
+      """
+
+      res =
+        conn
+        |> auth_conn(user_moderator)
+        |> post("/api", AbsintheHelpers.mutation_skeleton(mutation))
+
+      assert json_response(res, 200)["errors"] == nil
+      assert json_response(res, 200)["data"]["deleteReportNote"]["id"] == report_note_id
+    end
+  end
+end
diff --git a/test/support/factory.ex b/test/support/factory.ex
index 002566d2f..0d417cdda 100644
--- a/test/support/factory.ex
+++ b/test/support/factory.ex
@@ -202,4 +202,24 @@ defmodule Mobilizon.Factory do
       actor: build(:actor)
     }
   end
+
+  def report_factory do
+    %Mobilizon.Reports.Report{
+      content: "This is problematic",
+      status: :open,
+      uri: "http://mobilizon.test/report/deae1020-54b8-47df-9eea-d8c0e943e57f/activity",
+      reported: build(:actor),
+      reporter: build(:actor),
+      event: build(:event),
+      comments: build_list(1, :comment)
+    }
+  end
+
+  def report_note_factory do
+    %Mobilizon.Reports.Note{
+      content: "My opinion",
+      moderator: build(:actor),
+      report: build(:report)
+    }
+  end
 end