percent-encoding.py (990B)
1 import base64 2 from wptserve.utils import isomorphic_decode 3 4 # Use numeric references to let the HTML parser take care of inserting the correct code points 5 # rather than trying to figure out the necessary bytes for each encoding. (The latter can be 6 # especially tricky given that Python does not implement the Encoding Standard.) 7 def numeric_references(input): 8 output = b"" 9 for cp in input: 10 output += b"&#x" + format(ord(cp), u"X").encode(u"utf-8") + b";" 11 return output 12 13 def main(request, response): 14 # Undo the "magic" space with + replacement as otherwise base64 decoding will fail. 15 value = request.GET.first(b"value").replace(b" ", b"+") 16 encoding = request.GET.first(b"encoding") 17 18 output_value = numeric_references(base64.b64decode(value).decode(u"utf-8")) 19 return ( 20 [(b"Content-Type", b"text/html;charset=" + encoding)], 21 b"""<!doctype html> 22 <a href="https://doesnotmatter.invalid/?%s#%s">test</a> 23 """ % (output_value, output_value))