How to decode hex values from a string in python

Question

I am trying to decode the hex values inside my string so at the end I have one "readable" string.

For example:

encoded_string = 'videoplayback%253Fexpire%253D1532566750%2526mime%253Dvideo%25252Fmp4%2526key%253Dyt6%2526mt%253D1532544983%2526fvip%253D5%2526i'

Each hex value is indicated by a %-symbol and the length of the value can differentiate. What I tried is to decode the string manually:

encoded_string = encoded_string.replace('%253A', '\x25\x3A')
encoded_string = encoded_string.replace('%252F', '\x25\x2F')
encoded_string = encoded_string.replace('%253F', '\x25\x3F')
encoded_string = encoded_string.replace('%253D1532566750', '\x25\x3D\x15\x32\x56\x67\x50')

Now I need help with a function that is able to find the hex values and decode them.

Thank you guys!

Ignacio Vazquez-Abrams · Accepted Answer · 2018-07-25 21:57:04Z

2

Too much work.

>>> urllib.parse.unquote(urllib.parse.unquote(encoded_string))
'videoplayback?expire=1532566750&mime=video%2Fmp4&key=yt6&mt=1532544983&fvip=5&i'

answered Jul 25, 2018 at 21:57

Ignacio Vazquez-Abrams

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1 Comment

Daniel Börg Over a year ago

Didn't know about this! Thank you so much

a_guest · Accepted Answer · 2018-07-25 22:03:45Z

0

You can use regular expressions for that:

re.sub(
    r'%([A-F0-9]{4,14})',
    lambda m: str(int(m.groups()[0], 16)),
    encoded_string
)

Though I'm not sure if you just want to do URL decoding?

answered Jul 25, 2018 at 22:03

a_guest

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2 Comments

Daniel Börg Over a year ago

Yeah, i didn't know there were this option. Thank you

a_guest Over a year ago

@DanielBörg Please note that this is something completely different than the URL unquoting done in this answer. Here the hex strings you specified in the OP are taken as such and transformed to corresponding base 10 integer strings. Compare the results to make sure if it really is what you want.

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