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Diffstat (limited to 'urllib3/util/url.py')
| -rw-r--r-- | urllib3/util/url.py | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/urllib3/util/url.py b/urllib3/util/url.py new file mode 100644 index 0000000..e58050c --- /dev/null +++ b/urllib3/util/url.py @@ -0,0 +1,214 @@ +from collections import namedtuple + +from ..exceptions import LocationParseError + + +url_attrs = ['scheme', 'auth', 'host', 'port', 'path', 'query', 'fragment'] + + +class Url(namedtuple('Url', url_attrs)): + """ + Datastructure for representing an HTTP URL. Used as a return value for + :func:`parse_url`. + """ + slots = () + + def __new__(cls, scheme=None, auth=None, host=None, port=None, path=None, + query=None, fragment=None): + if path and not path.startswith('/'): + path = '/' + path + return super(Url, cls).__new__(cls, scheme, auth, host, port, path, + query, fragment) + + @property + def hostname(self): + """For backwards-compatibility with urlparse. We're nice like that.""" + return self.host + + @property + def request_uri(self): + """Absolute path including the query string.""" + uri = self.path or '/' + + if self.query is not None: + uri += '?' + self.query + + return uri + + @property + def netloc(self): + """Network location including host and port""" + if self.port: + return '%s:%d' % (self.host, self.port) + return self.host + + @property + def url(self): + """ + Convert self into a url + + This function should more or less round-trip with :func:`.parse_url`. The + returned url may not be exactly the same as the url inputted to + :func:`.parse_url`, but it should be equivalent by the RFC (e.g., urls + with a blank port will have : removed). + + Example: :: + + >>> U = parse_url('http://google.com/mail/') + >>> U.url + 'http://google.com/mail/' + >>> Url('http', 'username:password', 'host.com', 80, + ... '/path', 'query', 'fragment').url + 'http://username:password@host.com:80/path?query#fragment' + """ + scheme, auth, host, port, path, query, fragment = self + url = '' + + # We use "is not None" we want things to happen with empty strings (or 0 port) + if scheme is not None: + url += scheme + '://' + if auth is not None: + url += auth + '@' + if host is not None: + url += host + if port is not None: + url += ':' + str(port) + if path is not None: + url += path + if query is not None: + url += '?' + query + if fragment is not None: + url += '#' + fragment + + return url + + def __str__(self): + return self.url + +def split_first(s, delims): + """ + Given a string and an iterable of delimiters, split on the first found + delimiter. Return two split parts and the matched delimiter. + + If not found, then the first part is the full input string. + + Example:: + + >>> split_first('foo/bar?baz', '?/=') + ('foo', 'bar?baz', '/') + >>> split_first('foo/bar?baz', '123') + ('foo/bar?baz', '', None) + + Scales linearly with number of delims. Not ideal for large number of delims. + """ + min_idx = None + min_delim = None + for d in delims: + idx = s.find(d) + if idx < 0: + continue + + if min_idx is None or idx < min_idx: + min_idx = idx + min_delim = d + + if min_idx is None or min_idx < 0: + return s, '', None + + return s[:min_idx], s[min_idx+1:], min_delim + + +def parse_url(url): + """ + Given a url, return a parsed :class:`.Url` namedtuple. Best-effort is + performed to parse incomplete urls. Fields not provided will be None. + + Partly backwards-compatible with :mod:`urlparse`. + + Example:: + + >>> parse_url('http://google.com/mail/') + Url(scheme='http', host='google.com', port=None, path='/mail/', ...) + >>> parse_url('google.com:80') + Url(scheme=None, host='google.com', port=80, path=None, ...) + >>> parse_url('/foo?bar') + Url(scheme=None, host=None, port=None, path='/foo', query='bar', ...) + """ + + # While this code has overlap with stdlib's urlparse, it is much + # simplified for our needs and less annoying. + # Additionally, this implementations does silly things to be optimal + # on CPython. + + if not url: + # Empty + return Url() + + scheme = None + auth = None + host = None + port = None + path = None + fragment = None + query = None + + # Scheme + if '://' in url: + scheme, url = url.split('://', 1) + + # Find the earliest Authority Terminator + # (http://tools.ietf.org/html/rfc3986#section-3.2) + url, path_, delim = split_first(url, ['/', '?', '#']) + + if delim: + # Reassemble the path + path = delim + path_ + + # Auth + if '@' in url: + # Last '@' denotes end of auth part + auth, url = url.rsplit('@', 1) + + # IPv6 + if url and url[0] == '[': + host, url = url.split(']', 1) + host += ']' + + # Port + if ':' in url: + _host, port = url.split(':', 1) + + if not host: + host = _host + + if port: + # If given, ports must be integers. + if not port.isdigit(): + raise LocationParseError(url) + port = int(port) + else: + # Blank ports are cool, too. (rfc3986#section-3.2.3) + port = None + + elif not host and url: + host = url + + if not path: + return Url(scheme, auth, host, port, path, query, fragment) + + # Fragment + if '#' in path: + path, fragment = path.split('#', 1) + + # Query + if '?' in path: + path, query = path.split('?', 1) + + return Url(scheme, auth, host, port, path, query, fragment) + +def get_host(url): + """ + Deprecated. Use :func:`.parse_url` instead. + """ + p = parse_url(url) + return p.scheme or 'http', p.hostname, p.port |