flickr-downloader.sh

#!/bin/bash

url=$1

if [ "`echo $url | grep 'flickr.com'`" == '' ]; then
    echo ''
    echo 'This url seems not to be a flickr url ('$url')'
    echo ''

    exit 1
fi

if [ ! -d 'images' ]; then
    mkdir 'images'
fi

if [ ! -d 'cache' ]; then
    mkdir 'cache'
fi

md5=`echo -n "$url" | md5sum | sed s/[^a-z0-9]//g`

if [ ! -f "cache/$md5" ]; then
    curl -s --cookie-jar 'cookie' "$url" > "cache/$md5"
fi

html=`cat "cache/$md5"`
cookie=`echo $html | grep -o '"magic_cookie":"[^"]\+"' | sed 's/.*:"\([^"]\+\)"/\1/'`
page=0

while true; do
    page=$(($page + 1))
    md5=`echo -n "$url?data=1&append=1&page=$page&magic_cookie=$cookie" | md5sum | sed s/[^a-z0-9]//g`

    if [ ! -f "cache/$md5" ]; then
        curl -s --cookie 'cookie' "$url?data=1&append=1&page=$page&magic_cookie=$cookie" > "cache/$md5"
    fi

    images=`cat "cache/$md5" | grep -o 'https[^"]\+_o\.jpg' | sort | uniq | sed 's#\\\##g; s#//[^\.]\+\.\([^/]\+\)/\([0-9]\)/#//farm\2.\1/#g'`
    cnt=`echo $images | grep -o ' ' | wc -l`

    echo ''
    echo "Downloading $cnt pictures"
    echo "$url?data=1&append=1&page=$page&magic_cookie=$cookie"
    echo ''

    if [ "$cnt" -eq 0 ] || [ "$images" == '' ]; then
        break;
    fi

    i=0

    for image in $images; do 
        i=$(($i + 1))
        file='images/'$(basename "$image")

        if [ -f "$file" ] && [ -s "$file" ]; then
            echo "Picture $file already exists ($i / $cnt)"
            continue
        fi

        echo "Downloading $image ($i / $cnt)"

        wget --quiet "$image" -O "$file"

    done
done

echo ''
echo 'Download complete'
echo ''

exit 0