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# This program is public domain
"""
Parse URLs
"""
from six.moves.urllib import parse
class URL(object):
"""
Parse a universal resource locator
protocol://user:password@host:port/path?p1=v1&p2=v2
:Parameters:
*url* : string
URL to be parsed
*host* = 'localhost' : string
Default host
*user*, *password*, *protocol*, *path* = '' : string
Defaults user, password, protocol, path
*parameters* = []: [ (string,string ), ... ]
Default key,value pairs for POST queries.
*port* = 0 : integer
Default port
:Returns:
*url* : URL
The return URL, with attributes for the pieces
:Raises:
*ValueError* : Not a valid protocol
"""
def __init__(self, url, user='', password='', host='localhost',
protocol='', path='', port=0, parameters=[]):
errmsg = "".join( ("Invalid url <",url,">") )
# chop protocol
pieces = url.split('://')
if len(pieces) == 1:
url = pieces[0]
elif len(pieces) == 2:
protocol = pieces[0]
url = pieces[1]
else:
raise ValueError(errmsg)
pos = url.find('/')
if pos < 0:
server = url
else:
server = url[:pos]
path = url[pos+1:]
if '@' in server:
user,server = server.split('@')
if ':' in user:
user,password = user.split(':')
if ':' in server:
server,port = server.split(':')
port = int(port)
if server != '': host = server
if '?' in path:
path, pars = path.split('?')
parameters = [pair.split('=') for pair in pars.split('&')]
if any(len(pair) > 2 for pair in parameters):
raise ValueError(errmsg)
parameters = [[parse.unquote_plus(p) for p in pair]
for pair in parameters]
self.protocol = protocol
self.user = user
self.password = password
self.host = host
self.port = port
self.path = parse.unquote_plus(path)
self.parameters = parameters[:]
def __str__(self):
result = []
if self.protocol:
result.extend( (self.protocol,'://') )
if self.password:
result.extend( (self.user,':',self.password,'@') )
elif self.user:
result.extend( (self.user,'@') )
if self.host:
result.extend( (self.host,) )
if self.port:
result.extend( (':', str(self.port)) )
if self.path or len(self.parameters) > 0:
result.extend( ('/', parse.quote_plus(self.path)) )
if len(self.parameters) > 0:
pars = '&'.join('='.join(parse.quote_plus(p) for p in parts)
for parts in self.parameters)
result.extend( ('?', pars) )
return ''.join(result)
def test():
h = URL('a')
assert h.user=='' and h.password=='' and h.host=='a' and h.port==0
h = URL('a:4')
assert h.user=='' and h.password=='' and h.host=='a' and h.port==4
h = URL('u@a')
assert h.user=='u' and h.password=='' and h.host=='a' and h.port==0
h = URL('u:p@a')
assert h.user=='u' and h.password=='p' and h.host=='a' and h.port==0
h = URL('u@a:4')
assert h.user=='u' and h.password=='' and h.host=='a' and h.port==4
h = URL('u:p@a:4')
assert h.user=='u' and h.password=='p' and h.host=='a' and h.port==4
h = URL('')
assert h.user=='' and h.password=='' and h.host=='localhost' and h.port==0
h = URL('u@')
assert h.user=='u' and h.password=='' and h.host=='localhost' and h.port==0
h = URL('u@:4')
assert h.user=='u' and h.password=='' and h.host=='localhost' and h.port==4
h = URL('u:p@')
assert h.user=='u' and h.password=='p' and h.host=='localhost' and h.port==0
h = URL('u:p@:4')
assert h.user=='u' and h.password=='p' and h.host=='localhost' and h.port==4
h = URL('proto://u:p@:4')
assert (h.protocol=='proto' and h.user=='u' and h.password=='p'
and h.host=='localhost' and h.port==4)
h = URL('proto://u:p@:4/')
assert (h.protocol=='proto' and h.user=='u' and h.password=='p'
and h.host=='localhost' and h.port==4 and h.path == '')
h = URL('proto://u:p@:4/%7econnolly')
assert (h.protocol=='proto' and h.user=='u' and h.password=='p'
and h.host=='localhost' and h.port==4 and h.path == '~connolly')
h = URL('proto://u:p@:4/%7econnolly?this&that=other')
assert (h.protocol=='proto' and h.user=='u' and h.password=='p'
and h.host=='localhost' and h.port==4 and h.path == '~connolly')
assert (h.parameters[0][0] == 'this'
and h.parameters[1][0] == 'that'
and h.parameters[1][1] == 'other')
assert str(h) == 'proto://u:p@localhost:4/%7Econnolly?this&that=other'
if __name__ == "__main__": test()
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