mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-22 16:20:52 +01:00
132 lines
3.0 KiB
Bash
Executable File
132 lines
3.0 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# Copyright © 2021 Adrien Bourmault (neox@os-k.eu)
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
|
|
# This script is an example captcha script.
|
|
# It takes the text to recognize in the captcha image as a parameter.
|
|
# It return the image binary as a result. ejabberd support PNG, JPEG and GIF.
|
|
|
|
# The whole idea of the captcha script is to let server admins adapt it to
|
|
# their own needs. The goal is to be able to make the captcha generation as
|
|
# unique as possible, to make the captcha challenge difficult to bypass by
|
|
# a bot.
|
|
# Server admins are thus supposed to write and use their own captcha generators.
|
|
|
|
# This script relies on ImageMagick.
|
|
# It is NOT compliant with ImageMagick forks like GraphicsMagick.
|
|
|
|
INPUT=$1
|
|
|
|
TRANSFORMATIONS=(INTRUDER SUM)
|
|
DIGIT=(zero one two three four five six seven eight nine ten)
|
|
|
|
if test -n "${BASH_VERSION:-''}" ; then
|
|
get_random ()
|
|
{
|
|
R=$RANDOM
|
|
}
|
|
else
|
|
for n in $(od -A n -t u2 -N 64 /dev/urandom); do RL="$RL$n "; done
|
|
get_random ()
|
|
{
|
|
R=${RL%% *}
|
|
RL=${RL#* }
|
|
}
|
|
fi
|
|
|
|
INTRUDER()
|
|
{
|
|
NUMBERS=$(echo "$INPUT" | grep -o . | tr '\n' ' ')
|
|
SORTED_UNIQ_NUM=$(echo "${NUMBERS[@]}" | sort -u | tr '\n' ' ')
|
|
RANDOM_DIGITS=$(echo 123456789 | grep -o . | sort -R | tr '\n' ' ')
|
|
INTRUDER=-1
|
|
|
|
for i in $RANDOM_DIGITS
|
|
do
|
|
if [[ ! " ${SORTED_UNIQ_NUM[@]} " =~ ${i} ]]; then
|
|
INTRUDER=$i
|
|
break
|
|
fi
|
|
done
|
|
|
|
# Worst case
|
|
if [[ $INTRUDER -eq "-1" ]]
|
|
then
|
|
printf "Type %s \n without changes" "$INPUT"
|
|
return
|
|
fi
|
|
|
|
for num in ${NUMBERS}
|
|
do
|
|
get_random
|
|
R=$((R % 100))
|
|
|
|
if [[ $R -lt 60 ]]; then
|
|
NEWINPUT=${NEWINPUT}${num}${INTRUDER}
|
|
else
|
|
NEWINPUT=${NEWINPUT}${num}
|
|
fi
|
|
done
|
|
|
|
get_random
|
|
R=$((R % 100))
|
|
|
|
if [[ $R -lt 50 ]]; then
|
|
printf "Type %s by\n deleting the %s" "$NEWINPUT" "${DIGIT[$INTRUDER]}"
|
|
else
|
|
printf "Enter %s by\n removing the %s" "$NEWINPUT" "${DIGIT[$INTRUDER]}"
|
|
fi
|
|
}
|
|
|
|
|
|
SUM()
|
|
{
|
|
get_random
|
|
RA=$((R % 100))
|
|
|
|
if [[ $((INPUT % 2)) -eq 0 ]]; then
|
|
A=$((INPUT - RA))
|
|
B=$RA
|
|
else
|
|
B=$((INPUT - RA))
|
|
A=$RA
|
|
fi
|
|
|
|
get_random
|
|
R=$((R % 100))
|
|
|
|
if [[ $R -lt 25 ]]; then
|
|
printf "Type the result\n of %s + %s" "$A" "$B"
|
|
elif [[ $R -lt 50 ]]; then
|
|
printf "SUMx\n %s and %s" "$A" "$B"
|
|
elif [[ $R -lt 75 ]]; then
|
|
printf "Add\n %s and %s" "$A" "$B"
|
|
else
|
|
printf "Enter the result\n of %s + %s" "$A" "$B"
|
|
fi
|
|
}
|
|
|
|
|
|
get_random
|
|
|
|
RAND_ITALIC=$((R % 25))
|
|
get_random
|
|
|
|
RAND_ANGLE=$((R % 3))
|
|
get_random
|
|
|
|
RAND_INDEX=$((R % ${#TRANSFORMATIONS[@]}))
|
|
|
|
convert -size 300x60 xc:none -pointsize 20 \
|
|
\( -clone 0 -fill black \
|
|
-stroke black -strokewidth 1 \
|
|
-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
|
|
-roll +"$ROLL_X"+0 \
|
|
-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
|
|
-roll -"$ROLL_X"+0 \) \
|
|
-flatten -crop 300x60 +repage -quality 500 -depth 11 png:-
|