1 files changed, 21 insertions, 0 deletions
diff --git a/tools/captcha.sh b/tools/captcha.sh
new file mode 100755
index 000000000..2b18d93ad
--- /dev/null
+++ b/tools/captcha.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+SIGN=$(($RANDOM % 2))
+
+R1=$(($RANDOM % 20))
+R2=$(($RANDOM % 10 + 40))
+
+if [ $SIGN -eq "0" ]; then
+    S1=$(( -1*($RANDOM % 20 + 50) ))
+    S2=$(( $RANDOM % 20 + 50 ))
+else
+    S2=$(( -1*($RANDOM % 20 + 50) ))
+    S1=$(( $RANDOM % 20 + 50 ))
+fi
+
+convert -size 140x60 xc:white \
+    -pointsize 30 -draw "text 20,30 '$1'" \
+    -roll -$R2+$R1 -swirl $S1 \
+    -roll +$R2-$R1 -swirl $S2 \
+    +repage -resize 120x60 \
+    -quality 90 -depth 8 png:-