Python URL Decoder
The function url_decoder in url_decoder.py
from url_decode import url_encoder, url_decoder
url = "https://zh.wikipedia.org/zh-tw/百分号编码"
url = url_decoder(url)
print(url)
## output: https://zh.wikipedia.org/zh-tw/百分号编码
def url_decoder(b):
# https://zh.wikipedia.org/zh-tw/百分号编码
# ! mean 21hex, => int("21",16) => 33 => chr(33) => "!", result: "!"
if type(b)==bytes:
b = b.decode("utf-8") #byte can't insert utf8 charater
result = bytearray()
enter_hex_unicode_mode = 0
hex_tmp = ""
now_index = 0
for i in b:
if i=='%': #like QR, have entered mode, continue appending bytearray
enter_hex_unicode_mode = 1
continue
if enter_hex_unicode_mode:
hex_tmp = i
now_index = 1
if now_index==2: #Q_ len("51")=2 len("5F")=2
result.append(int(hex_tmp, 16) )
hex_tmp = ""
now_index = 0
enter_hex_unicode_mode = 0
continue
result.append(ord(i))
result = result.decode(encoding="utf-8")
return result
#保留字元的百分號編碼
URL_RFC_3986 = {
"!": "!", "#": "#", "$": "$", "&": "&", "'": "'", "(": "(", ")": ")", "*": "*", " ": "+",
",": ",", "/": "/", ":": ":", ";": ";", "=": "=", "?": "?", "@": "@", "[": "[", "]": "]",
}
def url_encoder(b):
# https://zh.wikipedia.org/wiki/百分号编码
if type(b)==bytes:
b = b.decode(encoding="utf-8") #byte can't insert many utf8 charaters
result = bytearray() #bytearray: rw, bytes: read-only
for i in b:
if i in URL_RFC_3986:
for j in URL_RFC_3986[i]:
result.append(ord(j))
continue
i = bytes(i, encoding="utf-8")
if len(i)==1:
result.append(ord(i))
else:
for c in i:
c = hex(c)[2:].upper()
result.append(ord("%"))
result.append(ord(c[0:1]))
result.append(ord(c[1:2]))
result = result.decode(encoding="ascii")
return result
#print(url_encoder("我好棒==%%0.0:)")) ==> '我好棒==%%0.0:)'