131 lines
3.3 KiB
Bash
Executable File
131 lines
3.3 KiB
Bash
Executable File
#!/bin/bash
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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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TRANSFORMATIONS=(INTRUS SOMME)
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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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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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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 "${NUMBERS[@]}" | sort -u | tr '\n' ' ')
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RANDOM_DIGITS=$(echo 123456789 | grep -o . | sort -R | tr '\n' ' ')
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INTRUS=-1
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for i in ${RANDOM_DIGITS[@]}
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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 \n 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 $NEWINPUT en\n supprimant les ${DIGIT[$INTRUS]}"
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else
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echo "Saisissez $NEWINPUT en\n enlevant les ${DIGIT[$INTRUS]}"
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fi
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}
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SOMME()
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{
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get_random
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RA=$(($R % 100))
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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\n de $A + $B"
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elif [[ $R -lt 50 ]]; then
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echo "Sommez\n $A et $B"
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elif [[ $R -lt 75 ]]; then
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echo "Additionnez\n $A et $B"
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else
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echo "Saisissez le résultat\n de $A + $B"
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fi
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}
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get_random
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RAND_ITALIC=$(($R % 25))
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get_random
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RAND_ANGLE=$(($R % 3))
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get_random
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RAND_INDEX=$(($R % ${#TRANSFORMATIONS[@]}))
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convert -size 300x60 xc:none -pointsize 20 \
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\( -clone 0 -fill black \
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-stroke black -strokewidth 1 \
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-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
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-roll +$ROLL_X+0 \
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-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
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-roll -$ROLL_X+0 \) \
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-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/lib/ejabberd/chapril_captchas/$(date "+%Y-%m-%d-%H%M%S")_${INPUT}.png"
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convert -size 300x60 xc:none -pointsize 20 \
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\( -clone 0 -fill black \
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-stroke black -strokewidth 1 \
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-annotate "${RAND_ANGLE}x${RAND_ITALIC}+0+0" "\n $(${TRANSFORMATIONS[$RAND_INDEX]})" \
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-roll +$ROLL_X+0 \
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-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
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-roll -$ROLL_X+0 \) \
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-flatten -crop 300x60 +repage -quality 500 -depth 11 png:-
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