Add 'requests' library to third_party.

third_party/requests/models.py

Index: third_party/requests/models.py
diff --git a/third_party/requests/models.py b/third_party/requests/models.py
new file mode 100644
index 0000000000000000000000000000000000000000..6cf2aaa1a6c8b69dd7b5f8d7e26066e4055c9883
--- /dev/null
+++ b/third_party/requests/models.py
@@ -0,0 +1,686 @@
+# -*- coding: utf-8 -*-
+
+"""
+requests.models
+~~~~~~~~~~~~~~~
+
+This module contains the primary objects that power Requests.
+"""
+
+import collections
+import logging
+import datetime
+
+from io import BytesIO
+from .hooks import default_hooks
+from .structures import CaseInsensitiveDict
+
+from .auth import HTTPBasicAuth
+from .cookies import cookiejar_from_dict, get_cookie_header
+from .packages.urllib3.filepost import encode_multipart_formdata
+from .packages.urllib3.util import parse_url
+from .exceptions import HTTPError, RequestException, MissingSchema, InvalidURL
+from .utils import (
+    guess_filename, get_auth_from_url, requote_uri,
+    stream_decode_response_unicode, to_key_val_list, parse_header_links,
+    iter_slices, guess_json_utf, super_len)
+from .compat import (
+    cookielib, urlparse, urlunparse, urlsplit, urlencode, str, bytes, StringIO,
+    is_py2, chardet, json, builtin_str, basestring)
+
+CONTENT_CHUNK_SIZE = 10 * 1024
+ITER_CHUNK_SIZE = 512
+
+log = logging.getLogger(__name__)
+
+
+class RequestEncodingMixin(object):
+    @property
+    def path_url(self):
+        """Build the path URL to use."""
+
+        url = []
+
+        p = urlsplit(self.url)
+
+        path = p.path
+        if not path:
+            path = '/'
+
+        url.append(path)
+
+        query = p.query
+        if query:
+            url.append('?')
+            url.append(query)
+
+        return ''.join(url)
+
+    @staticmethod
+    def _encode_params(data):
+        """Encode parameters in a piece of data.
+
+        Will successfully encode parameters when passed as a dict or a list of
+        2-tuples. Order is retained if data is a list of 2-tuples but arbitrary
+        if parameters are supplied as a dict.
+        """
+
+        if isinstance(data, (str, bytes)):
+            return data
+        elif hasattr(data, 'read'):
+            return data
+        elif hasattr(data, '__iter__'):
+            result = []
+            for k, vs in to_key_val_list(data):
+                if isinstance(vs, basestring) or not hasattr(vs, '__iter__'):
+                    vs = [vs]
+                for v in vs:
+                    if v is not None:
+                        result.append(
+                            (k.encode('utf-8') if isinstance(k, str) else k,
+                             v.encode('utf-8') if isinstance(v, str) else v))
+            return urlencode(result, doseq=True)
+        else:
+            return data
+
+    @staticmethod
+    def _encode_files(files, data):
+        """Build the body for a multipart/form-data request.
+
+        Will successfully encode files when passed as a dict or a list of
+        2-tuples. Order is retained if data is a list of 2-tuples but abritrary
+        if parameters are supplied as a dict.
+
+        """
+        if (not files) or isinstance(data, str):
+            return None
+
+        new_fields = []
+        fields = to_key_val_list(data or {})
+        files = to_key_val_list(files or {})
+
+        for field, val in fields:
+            if isinstance(val, basestring) or not hasattr(val, '__iter__'):
+                val = [val]
+            for v in val:
+                if v is not None:
+                    new_fields.append(
+                        (field.decode('utf-8') if isinstance(field, bytes) else field,
+                         v.encode('utf-8') if isinstance(v, str) else v))
+
+        for (k, v) in files:
+            # support for explicit filename
+            ft = None
+            if isinstance(v, (tuple, list)):
+                if len(v) == 2:
+                    fn, fp = v
+                else:
+                    fn, fp, ft = v
+            else:
+                fn = guess_filename(v) or k
+                fp = v
+            if isinstance(fp, str):
+                fp = StringIO(fp)
+            if isinstance(fp, bytes):
+                fp = BytesIO(fp)
+
+            if ft:
+                new_v = (fn, fp.read(), ft)
+            else:
+                new_v = (fn, fp.read())
+            new_fields.append((k, new_v))
+
+        body, content_type = encode_multipart_formdata(new_fields)
+
+        return body, content_type
+
+
+class RequestHooksMixin(object):
+    def register_hook(self, event, hook):
+        """Properly register a hook."""
+
+        if isinstance(hook, collections.Callable):
+            self.hooks[event].append(hook)
+        elif hasattr(hook, '__iter__'):
+            self.hooks[event].extend(h for h in hook if isinstance(h, collections.Callable))
+
+    def deregister_hook(self, event, hook):
+        """Deregister a previously registered hook.
+        Returns True if the hook existed, False if not.
+        """
+
+        try:
+            self.hooks[event].remove(hook)
+            return True
+        except ValueError:
+            return False
+
+
+class Request(RequestHooksMixin):
+    """A user-created :class:`Request <Request>` object.
+
+    Used to prepare a :class:`PreparedRequest <PreparedRequest>`, which is sent to the server.
+
+    :param method: HTTP method to use.
+    :param url: URL to send.
+    :param headers: dictionary of headers to send.
+    :param files: dictionary of {filename: fileobject} files to multipart upload.
+    :param data: the body to attach the request. If a dictionary is provided, form-encoding will take place.
+    :param params: dictionary of URL parameters to append to the URL.
+    :param auth: Auth handler or (user, pass) tuple.
+    :param cookies: dictionary or CookieJar of cookies to attach to this request.
+    :param hooks: dictionary of callback hooks, for internal usage.
+
+    Usage::
+
+      >>> import requests
+      >>> req = requests.Request('GET', 'http://httpbin.org/get')
+      >>> req.prepare()
+      <PreparedRequest [GET]>
+
+    """
+    def __init__(self,
+        method=None,
+        url=None,
+        headers=None,
+        files=None,
+        data=dict(),
+        params=dict(),
+        auth=None,
+        cookies=None,
+        hooks=None):
+
+        # Default empty dicts for dict params.
+        data = [] if data is None else data
+        files = [] if files is None else files
+        headers = {} if headers is None else headers
+        params = {} if params is None else params
+        hooks = {} if hooks is None else hooks
+
+        self.hooks = default_hooks()
+        for (k, v) in list(hooks.items()):
+            self.register_hook(event=k, hook=v)
+
+        self.method = method
+        self.url = url
+        self.headers = headers
+        self.files = files
+        self.data = data
+        self.params = params
+        self.auth = auth
+        self.cookies = cookies
+        self.hooks = hooks
+
+    def __repr__(self):
+        return '<Request [%s]>' % (self.method)
+
+    def prepare(self):
+        """Constructs a :class:`PreparedRequest <PreparedRequest>` for transmission and returns it."""
+        p = PreparedRequest()
+
+        p.prepare_method(self.method)
+        p.prepare_url(self.url, self.params)
+        p.prepare_headers(self.headers)
+        p.prepare_cookies(self.cookies)
+        p.prepare_body(self.data, self.files)
+        p.prepare_auth(self.auth, self.url)
+        # Note that prepare_auth must be last to enable authentication schemes
+        # such as OAuth to work on a fully prepared request.
+
+        # This MUST go after prepare_auth. Authenticators could add a hook
+        p.prepare_hooks(self.hooks)
+
+        return p
+
+
+class PreparedRequest(RequestEncodingMixin, RequestHooksMixin):
+    """The fully mutable :class:`PreparedRequest <PreparedRequest>` object,
+    containing the exact bytes that will be sent to the server.
+
+    Generated from either a :class:`Request <Request>` object or manually.
+
+    Usage::
+
+      >>> import requests
+      >>> req = requests.Request('GET', 'http://httpbin.org/get')
+      >>> r = req.prepare()
+      <PreparedRequest [GET]>
+
+      >>> s = requests.Session()
+      >>> s.send(r)
+      <Response [200]>
+
+    """
+
+    def __init__(self):
+        #: HTTP verb to send to the server.
+        self.method = None
+        #: HTTP URL to send the request to.
+        self.url = None
+        #: dictionary of HTTP headers.
+        self.headers = None
+        #: request body to send to the server.
+        self.body = None
+        #: dictionary of callback hooks, for internal usage.
+        self.hooks = default_hooks()
+
+    def __repr__(self):
+        return '<PreparedRequest [%s]>' % (self.method)
+
+    def prepare_method(self, method):
+        """Prepares the given HTTP method."""
+        self.method = method
+        if self.method is not None:
+            self.method = self.method.upper()
+
+    def prepare_url(self, url, params):
+        """Prepares the given HTTP URL."""
+        #: Accept objects that have string representations.
+        try:
+            url = unicode(url)
+        except NameError:
+            # We're on Python 3.
+            url = str(url)
+        except UnicodeDecodeError:
+            pass
+
+        # Support for unicode domain names and paths.
+        scheme, auth, host, port, path, query, fragment = parse_url(url)
+
+        if not scheme:
+            raise MissingSchema("Invalid URL %r: No schema supplied" % url)
+
+        if not host:
+            raise InvalidURL("Invalid URL %r: No host supplied" % url)
+
+        # Only want to apply IDNA to the hostname
+        try:
+            host = host.encode('idna').decode('utf-8')
+        except UnicodeError:
+            raise InvalidURL('URL has an invalid label.')
+
+        # Carefully reconstruct the network location
+        netloc = auth or ''
+        if netloc:
+            netloc += '@'
+        netloc += host
+        if port:
+            netloc += ':' + str(port)
+
+        # Bare domains aren't valid URLs.
+        if not path:
+            path = '/'
+
+        if is_py2:
+            if isinstance(scheme, str):
+                scheme = scheme.encode('utf-8')
+            if isinstance(netloc, str):
+                netloc = netloc.encode('utf-8')
+            if isinstance(path, str):
+                path = path.encode('utf-8')
+            if isinstance(query, str):
+                query = query.encode('utf-8')
+            if isinstance(fragment, str):
+                fragment = fragment.encode('utf-8')
+
+        enc_params = self._encode_params(params)
+        if enc_params:
+            if query:
+                query = '%s&%s' % (query, enc_params)
+            else:
+                query = enc_params
+
+        url = requote_uri(urlunparse([scheme, netloc, path, None, query, fragment]))
+        self.url = url
+
+    def prepare_headers(self, headers):
+        """Prepares the given HTTP headers."""
+
+        if headers:
+            headers = dict((name.encode('ascii'), value) for name, value in headers.items())
+            self.headers = CaseInsensitiveDict(headers)
+        else:
+            self.headers = CaseInsensitiveDict()
+
+    def prepare_body(self, data, files):
+        """Prepares the given HTTP body data."""
+
+        # Check if file, fo, generator, iterator.
+        # If not, run through normal process.
+
+        # Nottin' on you.
+        body = None
+        content_type = None
+        length = None
+        is_stream = False
+
+        is_stream = all([
+            hasattr(data, '__iter__'),
+            not isinstance(data, basestring),
+            not isinstance(data, list),
+            not isinstance(data, dict)
+        ])
+
+        try:
+            length = super_len(data)
+        except (TypeError, AttributeError):
+            length = False
+
+        if is_stream:
+            body = data
+
+            if files:
+                raise NotImplementedError('Streamed bodies and files are mutually exclusive.')
+
+            if length:
+                self.headers['Content-Length'] = str(length)
+            else:
+                self.headers['Transfer-Encoding'] = 'chunked'
+        # Check if file, fo, generator, iterator.
+        # If not, run through normal process.
+
+        else:
+            # Multi-part file uploads.
+            if files:
+                (body, content_type) = self._encode_files(files, data)
+            else:
+                if data:
+                    body = self._encode_params(data)
+                    if isinstance(data, str) or isinstance(data, builtin_str) or hasattr(data, 'read'):
+                        content_type = None
+                    else:
+                        content_type = 'application/x-www-form-urlencoded'
+
+            self.prepare_content_length(body)
+
+            # Add content-type if it wasn't explicitly provided.
+            if (content_type) and (not 'content-type' in self.headers):
+                self.headers['Content-Type'] = content_type
+
+        self.body = body
+
+    def prepare_content_length(self, body):
+        if hasattr(body, 'seek') and hasattr(body, 'tell'):
+            body.seek(0, 2)
+            self.headers['Content-Length'] = str(body.tell())
+            body.seek(0, 0)
+        elif body is not None:
+            l = super_len(body)
+            if l:
+                self.headers['Content-Length'] = str(l)
+        elif self.method not in ('GET', 'HEAD'):
+            self.headers['Content-Length'] = '0'
+
+    def prepare_auth(self, auth, url=''):
+        """Prepares the given HTTP auth data."""
+
+        # If no Auth is explicitly provided, extract it from the URL first.
+        if auth is None:
+            url_auth = get_auth_from_url(self.url)
+            auth = url_auth if any(url_auth) else None
+
+        if auth:
+            if isinstance(auth, tuple) and len(auth) == 2:
+                # special-case basic HTTP auth
+                auth = HTTPBasicAuth(*auth)
+
+            # Allow auth to make its changes.
+            r = auth(self)
+
+            # Update self to reflect the auth changes.
+            self.__dict__.update(r.__dict__)
+
+            # Recompute Content-Length
+            self.prepare_content_length(self.body)
+
+    def prepare_cookies(self, cookies):
+        """Prepares the given HTTP cookie data."""
+
+        if isinstance(cookies, cookielib.CookieJar):
+            cookies = cookies
+        else:
+            cookies = cookiejar_from_dict(cookies)
+
+        if 'cookie' not in self.headers:
+            cookie_header = get_cookie_header(cookies, self)
+            if cookie_header is not None:
+                self.headers['Cookie'] = cookie_header
+
+    def prepare_hooks(self, hooks):
+        """Prepares the given hooks."""
+        for event in hooks:
+            self.register_hook(event, hooks[event])
+
+
+class Response(object):
+    """The :class:`Response <Response>` object, which contains a
+    server's response to an HTTP request.
+    """
+
+    def __init__(self):
+        super(Response, self).__init__()
+
+        self._content = False
+        self._content_consumed = False
+
+        #: Integer Code of responded HTTP Status.
+        self.status_code = None
+
+        #: Case-insensitive Dictionary of Response Headers.
+        #: For example, ``headers['content-encoding']`` will return the
+        #: value of a ``'Content-Encoding'`` response header.
+        self.headers = CaseInsensitiveDict()
+
+        #: File-like object representation of response (for advanced usage).
+        #: Requires that ``stream=True` on the request.
+        # This requirement does not apply for use internally to Requests.
+        self.raw = None
+
+        #: Final URL location of Response.
+        self.url = None
+
+        #: Encoding to decode with when accessing r.text.
+        self.encoding = None
+
+        #: A list of :class:`Response <Response>` objects from
+        #: the history of the Request. Any redirect responses will end
+        #: up here. The list is sorted from the oldest to the most recent request.
+        self.history = []
+
+        self.reason = None
+
+        #: A CookieJar of Cookies the server sent back.
+        self.cookies = cookiejar_from_dict({})
+
+        #: The amount of time elapsed between sending the request
+        #: and the arrival of the response (as a timedelta)
+        self.elapsed = datetime.timedelta(0)
+
+    def __repr__(self):
+        return '<Response [%s]>' % (self.status_code)
+
+    def __bool__(self):
+        """Returns true if :attr:`status_code` is 'OK'."""
+        return self.ok
+
+    def __nonzero__(self):
+        """Returns true if :attr:`status_code` is 'OK'."""
+        return self.ok
+
+    def __iter__(self):
+        """Allows you to use a response as an iterator."""
+        return self.iter_content(128)
+
+    @property
+    def ok(self):
+        try:
+            self.raise_for_status()
+        except RequestException:
+            return False
+        return True
+
+    @property
+    def apparent_encoding(self):
+        """The apparent encoding, provided by the lovely Charade library
+        (Thanks, Ian!)."""
+        return chardet.detect(self.content)['encoding']
+
+    def iter_content(self, chunk_size=1, decode_unicode=False):
+        """Iterates over the response data.  When stream=True is set on the
+        request, this avoids reading the content at once into memory for
+        large responses.  The chunk size is the number of bytes it should
+        read into memory.  This is not necessarily the length of each item
+        returned as decoding can take place.
+        """
+        if self._content_consumed:
+            # simulate reading small chunks of the content
+            return iter_slices(self._content, chunk_size)
+
+        def generate():
+            while 1:
+                chunk = self.raw.read(chunk_size, decode_content=True)
+                if not chunk:
+                    break
+                yield chunk
+            self._content_consumed = True
+
+        gen = generate()
+
+        if decode_unicode:
+            gen = stream_decode_response_unicode(gen, self)
+
+        return gen
+
+    def iter_lines(self, chunk_size=ITER_CHUNK_SIZE, decode_unicode=None):
+        """Iterates over the response data, one line at a time.  When
+        stream=True is set on the request, this avoids reading the
+        content at once into memory for large responses.
+        """
+
+        pending = None
+
+        for chunk in self.iter_content(chunk_size=chunk_size,
+                                       decode_unicode=decode_unicode):
+
+            if pending is not None:
+                chunk = pending + chunk
+            lines = chunk.splitlines()
+
+            if lines and lines[-1] and chunk and lines[-1][-1] == chunk[-1]:
+                pending = lines.pop()
+            else:
+                pending = None
+
+            for line in lines:
+                yield line
+
+        if pending is not None:
+            yield pending
+
+    @property
+    def content(self):
+        """Content of the response, in bytes."""
+
+        if self._content is False:
+            # Read the contents.
+            try:
+                if self._content_consumed:
+                    raise RuntimeError(
+                        'The content for this response was already consumed')
+
+                if self.status_code == 0:
+                    self._content = None
+                else:
+                    self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes()
+
+            except AttributeError:
+                self._content = None
+
+        self._content_consumed = True
+        # don't need to release the connection; that's been handled by urllib3
+        # since we exhausted the data.
+        return self._content
+
+    @property
+    def text(self):
+        """Content of the response, in unicode.
+
+        if Response.encoding is None and chardet module is available, encoding
+        will be guessed.
+        """
+
+        # Try charset from content-type
+        content = None
+        encoding = self.encoding
+
+        if not self.content:
+            return str('')
+
+        # Fallback to auto-detected encoding.
+        if self.encoding is None:
+            encoding = self.apparent_encoding
+
+        # Decode unicode from given encoding.
+        try:
+            content = str(self.content, encoding, errors='replace')
+        except (LookupError, TypeError):
+            # A LookupError is raised if the encoding was not found which could
+            # indicate a misspelling or similar mistake.
+            #
+            # A TypeError can be raised if encoding is None
+            #
+            # So we try blindly encoding.
+            content = str(self.content, errors='replace')
+
+        return content
+
+    def json(self, **kwargs):
+        """Returns the json-encoded content of a response, if any.
+
+        :param \*\*kwargs: Optional arguments that ``json.loads`` takes.
+        """
+
+        if not self.encoding and len(self.content) > 3:
+            # No encoding set. JSON RFC 4627 section 3 states we should expect
+            # UTF-8, -16 or -32. Detect which one to use; If the detection or
+            # decoding fails, fall back to `self.text` (using chardet to make
+            # a best guess).
+            encoding = guess_json_utf(self.content)
+            if encoding is not None:
+                return json.loads(self.content.decode(encoding), **kwargs)
+        return json.loads(self.text or self.content, **kwargs)
+
+    @property
+    def links(self):
+        """Returns the parsed header links of the response, if any."""
+
+        header = self.headers.get('link')
+
+        # l = MultiDict()
+        l = {}
+
+        if header:
+            links = parse_header_links(header)
+
+            for link in links:
+                key = link.get('rel') or link.get('url')
+                l[key] = link
+
+        return l
+
+    def raise_for_status(self):
+        """Raises stored :class:`HTTPError`, if one occurred."""
+
+        http_error_msg = ''
+
+        if 400 <= self.status_code < 500:
+            http_error_msg = '%s Client Error: %s' % (self.status_code, self.reason)
+
+        elif 500 <= self.status_code < 600:
+            http_error_msg = '%s Server Error: %s' % (self.status_code, self.reason)
+
+        if http_error_msg:
+            raise HTTPError(http_error_msg, response=self)
+
+    def close(self):
+        return self.raw.release_conn()