2021-01-08 20:30:08 +01:00
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#!/bin/bash
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2020-12-27 20:52:45 +01:00
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2021-08-31 12:30:39 +02:00
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# Copyright © 2021 Adrien Bourmault (neox@a-lec.org)
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# Copyright © 2021 Echolib (echolib@dismail.de)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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2020-12-27 20:52:45 +01:00
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# This script is an example captcha script.
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# It takes the text to recognize in the captcha image as a parameter.
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# It return the image binary as a result. ejabberd support PNG, JPEG and GIF.
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# The whole idea of the captcha script is to let server admins adapt it to
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# their own needs. The goal is to be able to make the captcha generation as
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# unique as possible, to make the captcha challenge difficult to bypass by
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# a bot.
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# Server admins are thus supposed to write and use their own captcha generators.
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# This script relies on ImageMagick.
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# It is NOT compliant with ImageMagick forks like GraphicsMagick.
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INPUT=$1
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2021-08-31 12:30:39 +02:00
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LENINPUT=${#INPUT}
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2021-08-31 12:31:03 +02:00
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DIGITS=(zéros uns deux trois quatres cinqs six septs huits neufs dix)
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DIGIT=(zéro un deux trois quatre cinq six sept huit neuf dix)
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# ****************************************************************************
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#
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# Tools
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#
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# ****************************************************************************
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2021-01-08 21:34:02 +01:00
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2021-08-31 12:31:03 +02:00
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# Loops 10 times (should be enough) to check if a TARGET number is in INPUT
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2021-08-31 12:30:39 +02:00
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GENERATE__NOTIN() {
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for i in {1..10}
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do
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FALSENBR=`seq 1 9 | sort -R | head -n 1`
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! [[ $INPUT =~ $FALSENBR ]] \
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&& break
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done
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}
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2021-08-31 12:31:03 +02:00
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# ****************************************************************************
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#
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# Captcha shapes
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#
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# ****************************************************************************
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# REPLACEs a random number in INPUT by another one randomized
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2021-08-31 12:30:39 +02:00
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REPLACE() {
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NAME="REPLACE"
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PLACE=`seq 1 6 | sort -R | head -n 1`
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TARGET=`echo "$INPUT" | head -c $PLACE | tail -c 1`
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GENERATE__NOTIN
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NAME+="-$FALSENBR-$TARGET"
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NEWINPUT=${INPUT//$TARGET/$FALSENBR}
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2021-08-31 12:31:03 +02:00
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INSTRUCTIONS1="Remplacez les ${DIGITS[FALSENBR]} par des ${DIGITS[TARGET]}"
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2021-08-31 12:30:39 +02:00
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}
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2021-08-31 12:31:03 +02:00
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# REVERSEs INPUT. Ask to Add first or last number in random.
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2021-08-31 12:30:39 +02:00
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REVERSE() {
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NAME="REVERSE"
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RFL=`seq 1 2 | sort -R | head -n 1` # Rand First (1) or Last (2)
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2021-08-31 12:31:03 +02:00
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ADDNBR=${DIGITS[ADDNBR]}
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2021-08-31 12:30:39 +02:00
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for ((i=$LENINPUT-1;i>=0;i--))
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do
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NEWINPUT="$NEWINPUT${INPUT:$i:1}"
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done
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if (( $RFL == 1 ));then
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ADDNBR="${INPUT:0:1}"
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NAME+="_FIRST"
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NEWINPUT=${NEWINPUT:0:$LENINPUT-1} # Do not show first INPUT NBR
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2021-08-31 12:40:54 +02:00
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INSTRUCTIONS1="Écrivez le chiffre ${DIGIT[$ADDNBR]} puis"
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2021-08-31 12:30:39 +02:00
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INSTRUCTIONS2="Recopiez de DROITE à GAUCHE ←"
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2020-12-27 20:52:45 +01:00
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else
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2021-08-31 12:30:39 +02:00
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ADDNBR="${INPUT:$LENINPUT-1:1}"
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NAME+="_LAST"
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NEWINPUT=${NEWINPUT:1:$LENINPUT-1} # Do not show last INPUT NBR
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INSTRUCTIONS1="Recopiez de DROITE à GAUCHE ←"
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2021-08-31 12:40:54 +02:00
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INSTRUCTIONS2="Terminez par le chiffre ${DIGIT[$ADDNBR]}"
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2020-12-27 20:52:45 +01:00
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fi
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2021-08-31 12:30:39 +02:00
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NAME+="-$ADDNBR"
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}
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2020-12-27 20:52:45 +01:00
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2021-08-31 12:31:03 +02:00
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2021-08-31 12:30:39 +02:00
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# Add FALSE NBR to INPUT at three randomized place
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NOTIN() {
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NAME="NOTIN"
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GENERATE__NOTIN
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PLACE=(`seq 0 $((LENINPUT-1)) | sort -R | head -n 3 | sort -n`)
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for i in `seq 0 $((LENINPUT-1))`
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do
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(( $i == ${PLACE[0]} )) \
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&& NEWINPUT+="$FALSENBR"
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(( $i == ${PLACE[1]} )) \
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&& NEWINPUT+="$FALSENBR"
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(( $i == ${PLACE[2]} )) \
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&& NEWINPUT+="$FALSENBR"
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NEWINPUT="$NEWINPUT${INPUT:$i:1}"
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done
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NAME+="-$FALSENBR"
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2021-08-31 12:31:03 +02:00
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INSTRUCTIONS1="Recopiez sans les ${DIGITS[FALSENBR]}"
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2021-01-08 20:30:08 +01:00
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}
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2021-08-31 12:31:03 +02:00
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2021-08-31 12:30:39 +02:00
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# Take a random NBR from INPUT. Calculate X
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CALCUL() {
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PLACE=`seq 1 $((LENINPUT)) | sort -R | head -n 1`
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TARGET=`echo "$INPUT" | head -c $PLACE | tail -c 1`
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NEWINPUT=${INPUT//$TARGET/X}
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RC=`seq 1 2 | sort -R | head -n 1` # 1 = - | 2 = +
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if (( $RC == 1 ));then
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FALSENBR=`seq $TARGET 10 | sort -R | head -n 1`
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RESUME=$(( FALSENBR - TARGET ))
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INSTRUCTIONS1="Calculez: $FALSENBR moins $RESUME. Copiez..."
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NAME="CALCULM-$FALSENBR-$RESUME"
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else
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FALSENBR=`seq 1 4 | sort -R | head -n 1`
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if (( $FALSENBR <= $TARGET ));then
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RESULT=$(( TARGET + FALSENBR ))
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RESUME=$(( TARGET - FALSENBR ))
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2021-08-31 12:40:54 +02:00
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INSTRUCTIONS1="Calculez: ${DIGIT[FALSENBR]} + ${DIGIT[RESUME]}. Copiez..."
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2021-08-31 12:30:39 +02:00
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NAME="CALCULP-$FALSENBR-$RESUME"
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else
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RESULT=$(( FALSENBR - TARGET ))
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RESUME=$(( TARGET - RESULT ))
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2021-08-31 12:40:54 +02:00
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INSTRUCTIONS1="Calculez: ${DIGIT[RESULT]} + ${DIGIT[RESUME]}. Copiez..."
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2021-08-31 12:30:39 +02:00
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NAME="CALCULP-$RESULT-$RESUME"
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fi
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fi
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INSTRUCTIONS2="...en remplaçant chaque X par la somme"
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2021-01-08 20:30:08 +01:00
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}
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2020-12-27 20:52:45 +01:00
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2021-08-31 12:31:03 +02:00
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# ****************************************************************************
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#
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# Random captcha shape choice (aka main)
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#
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# ****************************************************************************
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2021-08-31 12:30:39 +02:00
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MODULES=(CALCUL NOTIN REPLACE REVERSE)
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2021-08-31 12:46:46 +02:00
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NMODULES=#MODULES[@]
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RMODULE=`seq 0 $((NMODULES-1)) | sort -R | head -n 1`
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2021-08-31 12:40:54 +02:00
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#eval "${MODULES[RMODULE]}"
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2020-12-27 20:52:45 +01:00
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2021-08-31 12:30:39 +02:00
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TEXT="$NEWINPUT"
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2021-08-31 12:31:03 +02:00
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CHAPRILURI="/var/lib/ejabberd/chapril_captchas/${NAME}_${NEWINPUT}_${INPUT}.png"
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2021-01-09 11:23:35 +01:00
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2021-01-14 18:55:18 +01:00
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convert -size 300x70 xc:none -pointsize 20 \
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2021-01-08 20:30:08 +01:00
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\( -clone 0 -fill black \
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-stroke black -strokewidth 1 \
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2021-08-31 12:30:39 +02:00
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-font Helvetica-Narrow -annotate "0x0+0+0" "\n $INSTRUCTIONS1" \
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-font Helvetica-Bold -annotate "0x0+0+22" "\n $TEXT" \
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-font Helvetica-Narrow -annotate "0x0+0+44" "\n $INSTRUCTIONS2" \
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2020-12-31 13:36:06 +01:00
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-roll +$ROLL_X+0 \
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-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
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2021-01-08 20:30:08 +01:00
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-roll -$ROLL_X+0 \) \
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2021-08-31 12:30:39 +02:00
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-flatten -crop 300x70 +repage -quality 500 \
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-depth 11 png:"$CHAPRILURI"
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2021-01-14 18:23:11 +01:00
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2021-01-14 18:55:18 +01:00
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convert -size 300x70 xc:none -pointsize 20 \
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2021-01-14 18:23:11 +01:00
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\( -clone 0 -fill black \
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-stroke black -strokewidth 1 \
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2021-08-31 12:30:39 +02:00
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-font Helvetica-Narrow -annotate "0x0+0+0" "\n $INSTRUCTIONS1" \
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-font Helvetica-Bold -annotate "0x0+0+22" "\n $TEXT" \
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-font Helvetica-Narrow -annotate "0x0+0+44" "\n $INSTRUCTIONS2" \
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2021-01-14 18:23:11 +01:00
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-roll +$ROLL_X+0 \
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-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
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-roll -$ROLL_X+0 \) \
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2021-01-14 18:55:18 +01:00
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-flatten -crop 300x70 +repage -quality 500 -depth 11 png:-
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