{"id":117033,"date":"2020-08-22T07:14:10","date_gmt":"2020-08-22T07:14:10","guid":{"rendered":"https:\/\/blog.finxter.com\/?p=12105"},"modified":"2020-08-22T07:14:10","modified_gmt":"2020-08-22T07:14:10","slug":"collection-url-decoding-methods","status":"publish","type":"post","link":"https:\/\/sickgaming.net\/blog\/2020\/08\/22\/collection-url-decoding-methods\/","title":{"rendered":"[Collection] URL Decoding Methods"},"content":{"rendered":"

URL encoding<\/a> “is a method to encode<\/a> information in a Uniform Resource Identifier<\/a> (URI)”<\/em>. It is also called Percent-encoding<\/em> because percentage symbols are used to encode certain reserved characters:<\/p>\n

\n\n\n\n\n
!<\/code><\/td>\n#<\/code><\/td>\n$<\/code><\/td>\n%<\/code><\/td>\n&<\/code><\/td>\n'<\/code><\/td>\n(<\/code><\/td>\n)<\/code><\/td>\n*<\/code><\/td>\n+<\/code><\/td>\n,<\/code><\/td>\n\/<\/code><\/td>\n:<\/code><\/td>\n;<\/code><\/td>\n=<\/code><\/td>\n?<\/code><\/td>\n@<\/code><\/td>\n[<\/code><\/td>\n]<\/code><\/td>\n<\/tr>\n
%21<\/code><\/td>\n%23<\/code><\/td>\n%24<\/code><\/td>\n%25<\/code><\/td>\n%26<\/code><\/td>\n%27<\/code><\/td>\n%28<\/code><\/td>\n%29<\/code><\/td>\n%2A<\/code><\/td>\n%2B<\/code><\/td>\n%2C<\/code><\/td>\n%2F<\/code><\/td>\n%3A<\/code><\/td>\n%3B<\/code><\/td>\n%3D<\/code><\/td>\n%3F<\/code><\/td>\n%40<\/code><\/td>\n%5B<\/code><\/td>\n%5D<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

This article collects various ways to decode <\/em><\/strong>an URL encoded string. Let’s get started!<\/p>\n

Python 2<\/h2>\n
$ alias urldecode='python -c \"import sys, urllib as ul; \\ print ul.unquote_plus(sys.argv[1])\"' $ alias urlencode='python -c \"import sys, urllib as ul; \\ print ul.quote_plus(sys.argv[1])\"'<\/pre>\n
Source<\/a><\/p>\n
Here’s an example usage:<\/p>\n
$ urldecode 'q+werty%3D%2F%3B'\nq werty=\/; $ urlencode 'q werty=\/;'\nq+werty%3D%2F%3B<\/pre>\n
Python 3<\/h2>\n
$ alias urldecode='python3 -c \"import sys, urllib.parse as ul; \\ print(ul.unquote_plus(sys.argv[1]))\"' $ alias urlencode='python3 -c \"import sys, urllib.parse as ul; \\ print (ul.quote_plus(sys.argv[1]))\"'<\/pre>\n
Here’s an example usage:<\/p>\n
$ urldecode 'q+werty%3D%2F%3B'\nq werty=\/; $ urlencode 'q werty=\/;'\nq+werty%3D%2F%3B<\/pre>\n
Source<\/a><\/p>\n
sed<\/h2>\n
$ sed 's@+@ @g;s@%@\\\\x@g' file | xargs -0 printf \"%b\"<\/pre>\n
Source<\/a><\/p>\n
sed with echo -e<\/h2>\n
$ sed -e's\/%\\([0-9A-F][0-9A-F]\\)\/\\\\\\\\\\x\\1\/g' file | xargs echo -e<\/pre>\n
Source<\/a><\/p>\n
sed with alias<\/h2>\n
For convenience, you may want to use an alias:<\/p>\n
$ alias urldecode='sed \"s@+@ @g;s@%@\\\\\\\\x@g\" | xargs -0 printf \"%b\"'<\/pre>\n
If you want to decode, you can now simply use:<\/p>\n
$ echo \"http%3A%2F%2Fwww\" | urldecode\nhttp:\/\/www<\/pre>\n
Source<\/a><\/p>\n
Bash<\/h2>\n
input=\"http%3A%2F%2Fwww\"\ndecoded=$(printf '%b' \"${input\/\/%\/\\\\x}\")<\/pre>\n
Source<\/a><\/p>\n
To handle pluses (+<\/code>) correctly, replace them with spaces using sed<\/code>:<\/p>\n
decoded=$(input=${input\/\/+\/ }; printf \"${input\/\/%\/\\\\x}\")<\/pre>\n
Bash + urlencode() + urldecode() Functions<\/h2>\n
urlencode() { # urlencode <string> local length=\"${#1}\" for (( i = 0; i < length; i++ )); do local c=\"${1:i:1}\" case $c in [a-zA-Z0-9.~_-]) printf \"$c\" ;; *) printf '%%%02X' \"'$c\" ;; esac done\n} urldecode() { # urldecode <string> local url_encoded=\"${1\/\/+\/ }\" printf '%b' \"${url_encoded\/\/%\/\\\\x}\"\n}<\/pre>\n
Sources:<\/p>\n