forked from lucien2k/wipy-urllib
/
urllib.py
146 lines (131 loc) · 4.41 KB
/
urllib.py
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"""Open an arbitrary URL.
Adapted for Micropython by Alex Cowan <acowan@gmail.com>
Includes some elements from the original urllib and urlencode libraries for Python
"""
import socket
try:
import ussl as ssl
except:
import ssl
class URLOpener:
def __init__(self, url, post_data={}):
self.code = 0
self.headers = {}
self.body = ""
self.url = url
[scheme, host, path, data] = urlparse(self.url)
if scheme == 'http':
addr = socket.getaddrinfo(host, 80)[0][-1]
s = socket.socket()
s.settimeout(5)
s.connect(addr)
else:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_SEC)
sock.settimeout(5)
s = ssl.wrap_socket(sock)
s.connect(socket.getaddrinfo(host, 443)[0][4])
if post_data:
data = urlencode(post_data)
#print('POST %s HTTP/1.0\r\nHost: %s\r\n\r\n%s\r\n' % (path or '/', host, data.strip()))
s.send(b'POST %s HTTP/1.0\r\nHost: %s\r\n\r\n%s\r\n' % (path or '/', host, data.strip()))
else:
#print('GET %s%s HTTP/1.0\r\nHost: %s\r\n\r\n' % (path or '/', '?'+data.strip(), host))
s.send(b'GET %s%s HTTP/1.0\r\nHost: %s\r\n\r\n' % (path or '/', '?'+data.strip(), host))
while 1:
recv = s.recv(1024)
if len(recv) == 0: break
self.body += recv.decode()
s.close()
self._parse_result()
def read(self):
return self.body
def _parse_result(self):
self.body = self.body.split('\r\n')
while self.body:
line = self.body.pop(0).strip()
if line == '':
break
if line[0:4] == 'HTTP':
data = line.split(' ')
self.code = int(data[1])
continue
if len(line.split(':')) >= 2:
data = line.split(':')
self.headers[data[0]] = (':'.join(data[1:])).strip()
continue
self.body = '\r\n'.join(self.body)
return
def urlparse(url):
scheme = url.split('://')[0].lower()
url = url.split('://')[1]
host = url.split('/')[0]
path = '/'
data = ""
if host != url:
path = ''.join(url.split('/')[1:])
if path.count('?'):
if path.count('?') > 1:
raise Exception('URL malformed, too many ?')
[path, data] = path.split('?')
return [scheme, host, path, data]
def urlopen(url, post_data={}):
orig_url = url
attempts = 0
result = URLOpener(url, post_data)
## Maximum of 4 redirects
while attempts < 4:
attempts += 1
if result.code in (301, 302):
url = result.headers.get('Location', '')
if not url.count('://'):
[scheme, host, path, data] = urlparse(orig_url)
url = '%s://%s%s' % (scheme, host, url)
if url:
result = URLOpener(url)
else:
raise Exception('URL returned a redirect but one was not found')
else:
return result
return result
always_safe = ('ABCDEFGHIJKLMNOPQRSTUVWXYZ'
'abcdefghijklmnopqrstuvwxyz'
'0123456789' '_.-')
def quote(s):
res = []
replacements = {}
for c in s:
if c in always_safe:
res.append(c)
continue
res.append('%%%x' % ord(c))
return ''.join(res)
def quote_plus(s):
if ' ' in s:
s = s.replace(' ', '+')
s = quote(s, safe + ' ')
return s
return quote(s, safe)
def unquote(s):
"""Kindly rewritten by Damien from Micropython"""
"""No longer uses caching because of memory limitations"""
res = s.split('%')
for i in xrange(1, len(res)):
item = res[i]
try:
res[i] = chr(int(item[:2], 16)) + item[2:]
except ValueError:
res[i] = '%' + item
return "".join(res)
def unquote_plus(s):
"""unquote('%7e/abc+def') -> '~/abc def'"""
s = s.replace('+', ' ')
return unquote(s)
def urlencode(query):
if isinstance(query, dict):
query = query.items()
l = []
for k, v in query:
k = quote_plus(str(k))
v = quote_plus(str(v))
l.append(k + '=' + v)
return '&'.join(l)