New captcha shapes and a bit refactoring
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Echolib
Adrien Bourmault
parent
4d6fd9ef5a
commit
69ac7a9537
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@ -1,5 +1,20 @@
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#!/bin/bash
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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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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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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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@ -14,121 +29,140 @@
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# It is NOT compliant with ImageMagick forks like GraphicsMagick.
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INPUT=$1
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TRANSFORMATIONS=(INTRUS SOMME)
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LENINPUT=${#INPUT}
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DIGIT=(zéros uns deux trois quatres cinqs six septs huits neufs dix)
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if test -n ${BASH_VERSION:-''} ; then
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get_random ()
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{
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R=$RANDOM
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}
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# Loop 10 times (should be enough) to check if a TARGET number is in INPUT
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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 =~ $FALSENBR ]] \
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&& break
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done
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}
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#=====
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# Modules
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#=====
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# REPLACE a random number in INPUT by another one Randomized
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REPLACE() {
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NAME="REPLACE"
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PLACE=`seq 1 6 | sort -R | head -n 1`
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TARGET=`echo "$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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INSTRUCTIONS1="Remplacez les ${DIGIT[FALSENBR]} par les ${DIGIT[TARGET]}"
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}
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# REVerse INPUT. Ask to Add first or last number in random.
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REVERSE() {
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NAME="REVERSE"
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RFL=`seq 1 2 | sort -R | head -n 1` # Rand First (1) or Last (2)
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ADDNBR=${DIGIT[ADDNBR]}
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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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INSTRUCTIONS1="Écrivez le chiffre ${DIGIT[$ADDNBR]} puis"
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INSTRUCTIONS2="Recopiez de DROITE à GAUCHE ←"
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else
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for n in `od -A n -t u2 -N 64 /dev/urandom`; do RL="$RL$n "; done
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get_random ()
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{
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R=${RL%% *}
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RL=${RL#* }
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}
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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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INSTRUCTIONS2="Terminez par le chiffre ${DIGIT[$ADDNBR]}"
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fi
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INTRUS()
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{
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LENGTH=${#INPUT}
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NUMBERS=$(echo $INPUT | grep -o . | tr '\n' ' ')
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SORTED_UNIQ_NUM=$(echo "${NUMBERS[@]}" | sort -u | tr '\n' ' ')
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INTRUS=-1
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for i in 1 2 3 4 5 6 7 8 9
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do
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if [[ ! " ${SORTED_UNIQ_NUM[@]} " =~ " ${i} " ]]; then
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INTRUS=$i
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break
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fi
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done
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# Worst case
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if [[ $INTRUS -eq "-1" ]]
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then
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echo Tapez "$INPUT |sans changement"
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return
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fi
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for num in ${NUMBERS[@]}
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do
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get_random
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R=$(($R % 100))
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if [[ $R -lt 60 ]]; then
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NEWINPUT=${NEWINPUT}${num}${INTRUS}
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else
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NEWINPUT=${NEWINPUT}${num}
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fi
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done
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get_random
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R=$(($R % 100))
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if [[ $R -lt 50 ]]; then
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echo "Tapez ce nombre en enlevant les ${DIGIT[$INTRUS]} | $NEWINPUT"
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else
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echo "Saisissez ce nombre sans les ${DIGIT[$INTRUS]} | $NEWINPUT"
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fi
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NAME+="-$ADDNBR"
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}
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SOMME()
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{
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get_random
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RB=$(($R % 5))
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get_random
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RA=$(($R % 10 * (10 ** $RB)))
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if [[ $(($INPUT % 2)) -eq 0 ]]; then
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A=$(($INPUT - $RA))
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B=$RA
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else
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B=$(($INPUT - $RA))
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A=$RA
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fi
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get_random
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R=$(($R % 100))
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if [[ $R -lt 25 ]]; then
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echo "Tapez le résultat de | $A + $B"
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elif [[ $R -lt 50 ]]; then
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echo "Sommez | $A et $B"
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elif [[ $R -lt 75 ]]; then
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echo "Additionnez | $A et $B"
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else
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echo "Saisissez le résultat de | $A + $B"
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fi
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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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INSTRUCTIONS1="Recopiez sans les ${DIGIT[FALSENBR]}"
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}
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get_random
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RAND_INDEX=$(($R % ${#TRANSFORMATIONS[@]}))
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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//$TARGET/X}
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INSTRUCTIONS=$(echo "$(${TRANSFORMATIONS[$RAND_INDEX]})" | cut -d "|" -f 1)
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INSTRUCTIONS2=$(echo "$(${TRANSFORMATIONS[$RAND_INDEX]})" | cut -d "|" -f 3)
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TEXT=$(echo "$(${TRANSFORMATIONS[$RAND_INDEX]})" | cut -d "|" -f 2)
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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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INSTRUCTIONS1="Calculez: ${DIGIT[FALSENBR]} + ${DIGIT[RESUME]}. Copiez..."
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NAME="CALCULP-$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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INSTRUCTIONS1="Calculez: ${DIGIT[RESULT]} + ${DIGIT[RESUME]}. Copiez..."
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NAME="CALCULP-$RESULT-$RESUME"
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fi
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fi
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INSTRUCTIONS2="...en remplaçant chaque X par la somme"
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}
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#=====
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# Choose a random module
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#=====
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MODULES=(CALCUL NOTIN REPLACE REVERSE)
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NBRMODULES=${#MODULES[@]}
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RMODULE=`seq 0 $((NBRMODULES-1)) | sort -R | head -n 1`
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eval "${MODULES[RMODULE]}"
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TEXT="$NEWINPUT"
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CHAPRILURI="$HOME/Images/Captcha/${NAME}_${NEWINPUT}_${INPUT}.png"
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convert -size 300x70 xc:none -pointsize 20 \
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\( -clone 0 -fill black \
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-stroke black -strokewidth 1 \
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-font Helvetica-Narrow -annotate "0x0+0+0" "\n $INSTRUCTIONS" \
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-font Helvetica-Bold -annotate "0x0+0+22" "\n $TEXT" \
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-font Helvetica-Narrow -annotate "0x0+0+44" "\n $INSTRUCTIONS2" \
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-font Helvetica-Narrow -annotate "0x0+0+0" "\n $INSTRUCTIONS1" \
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-font Helvetica-Bold -annotate "0x0+0+22" "\n $TEXT" \
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-font Helvetica-Narrow -annotate "0x0+0+44" "\n $INSTRUCTIONS2" \
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-roll +$ROLL_X+0 \
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-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
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-roll -$ROLL_X+0 \) \
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-flatten -crop 300x70 +repage -quality 500 -depth 11 png:"/var/lib/ejabberd/chapril_captchas/EXPERIMENTAL_$(date "+%Y-%m-%d-%H%M%S")_${INPUT}.png"
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-flatten -crop 300x70 +repage -quality 500 \
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-depth 11 png:"$CHAPRILURI"
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convert -size 300x70 xc:none -pointsize 20 \
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\( -clone 0 -fill black \
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-stroke black -strokewidth 1 \
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-font Helvetica-Narrow -annotate "0x0+0+0" "\n $INSTRUCTIONS" \
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-font Helvetica-Bold -annotate "0x0+0+22" "\n $TEXT" \
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-font Helvetica-Narrow -annotate "0x0+0+44" "\n $INSTRUCTIONS2" \
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-font Helvetica-Narrow -annotate "0x0+0+0" "\n $INSTRUCTIONS1" \
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-font Helvetica-Bold -annotate "0x0+0+22" "\n $TEXT" \
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-font Helvetica-Narrow -annotate "0x0+0+44" "\n $INSTRUCTIONS2" \
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-roll +$ROLL_X+0 \
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-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
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-roll -$ROLL_X+0 \) \
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