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#!/usr/bin/env python
#
# Copyright (C) 2008, 2009 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This module is used for version 2 of the Google Data APIs.
"""Provides a client to interact with Google Data API servers.
This module is used for version 2 of the Google Data APIs. The primary class
in this module is GDClient.
GDClient: handles auth and CRUD operations when communicating with servers.
GDataClient: deprecated client for version one services. Will be removed.
"""
__author__ = 'j.s@google.com (Jeff Scudder)'
import re
import atom.client
import atom.core
import atom.http_core
import gdata.gauth
import gdata.data
class Error(Exception):
pass
class RequestError(Error):
status = None
reason = None
body = None
headers = None
class RedirectError(RequestError):
pass
class CaptchaChallenge(RequestError):
captcha_url = None
captcha_token = None
class ClientLoginTokenMissing(Error):
pass
class MissingOAuthParameters(Error):
pass
class ClientLoginFailed(RequestError):
pass
class UnableToUpgradeToken(RequestError):
pass
class Unauthorized(Error):
pass
class BadAuthenticationServiceURL(RedirectError):
pass
class BadAuthentication(RequestError):
pass
class NotModified(RequestError):
pass
class NotImplemented(RequestError):
pass
def error_from_response(message, http_response, error_class,
response_body=None):
"""Creates a new exception and sets the HTTP information in the error.
Args:
message: str human readable message to be displayed if the exception is
not caught.
http_response: The response from the server, contains error information.
error_class: The exception to be instantiated and populated with
information from the http_response
response_body: str (optional) specify if the response has already been read
from the http_response object.
"""
if response_body is None:
body = http_response.read()
else:
body = response_body
error = error_class('%s: %i, %s' % (message, http_response.status, body))
error.status = http_response.status
error.reason = http_response.reason
error.body = body
error.headers = atom.http_core.get_headers(http_response)
return error
def get_xml_version(version):
"""Determines which XML schema to use based on the client API version.
Args:
version: string which is converted to an int. The version string is in
the form 'Major.Minor.x.y.z' and only the major version number
is considered. If None is provided assume version 1.
"""
if version is None:
return 1
return int(version.split('.')[0])
class GDClient(atom.client.AtomPubClient):
"""Communicates with Google Data servers to perform CRUD operations.
This class is currently experimental and may change in backwards
incompatible ways.
This class exists to simplify the following three areas involved in using
the Google Data APIs.
CRUD Operations:
The client provides a generic 'request' method for making HTTP requests.
There are a number of convenience methods which are built on top of
request, which include get_feed, get_entry, get_next, post, update, and
delete. These methods contact the Google Data servers.
Auth:
Reading user-specific private data requires authorization from the user as
do any changes to user data. An auth_token object can be passed into any
of the HTTP requests to set the Authorization header in the request.
You may also want to set the auth_token member to a an object which can
use modify_request to set the Authorization header in the HTTP request.
If you are authenticating using the email address and password, you can
use the client_login method to obtain an auth token and set the
auth_token member.
If you are using browser redirects, specifically AuthSub, you will want
to use gdata.gauth.AuthSubToken.from_url to obtain the token after the
redirect, and you will probably want to updgrade this since use token
to a multiple use (session) token using the upgrade_token method.
API Versions:
This client is multi-version capable and can be used with Google Data API
version 1 and version 2. The version should be specified by setting the
api_version member to a string, either '1' or '2'.
"""
# The gsessionid is used by Google Calendar to prevent redirects.
__gsessionid = None
api_version = None
# Name of the Google Data service when making a ClientLogin request.
auth_service = None
# URL prefixes which should be requested for AuthSub and OAuth.
auth_scopes = None
def request(self, method=None, uri=None, auth_token=None,
http_request=None, converter=None, desired_class=None,
redirects_remaining=4, **kwargs):
"""Make an HTTP request to the server.
See also documentation for atom.client.AtomPubClient.request.
If a 302 redirect is sent from the server to the client, this client
assumes that the redirect is in the form used by the Google Calendar API.
The same request URI and method will be used as in the original request,
but a gsessionid URL parameter will be added to the request URI with
the value provided in the server's 302 redirect response. If the 302
redirect is not in the format specified by the Google Calendar API, a
RedirectError will be raised containing the body of the server's
response.
The method calls the client's modify_request method to make any changes
required by the client before the request is made. For example, a
version 2 client could add a GData-Version: 2 header to the request in
its modify_request method.
Args:
method: str The HTTP verb for this request, usually 'GET', 'POST',
'PUT', or 'DELETE'
uri: atom.http_core.Uri, str, or unicode The URL being requested.
auth_token: An object which sets the Authorization HTTP header in its
modify_request method. Recommended classes include
gdata.gauth.ClientLoginToken and gdata.gauth.AuthSubToken
among others.
http_request: (optional) atom.http_core.HttpRequest
converter: function which takes the body of the response as it's only
argument and returns the desired object.
desired_class: class descended from atom.core.XmlElement to which a
successful response should be converted. If there is no
converter function specified (converter=None) then the
desired_class will be used in calling the
atom.core.parse function. If neither
the desired_class nor the converter is specified, an
HTTP reponse object will be returned.
redirects_remaining: (optional) int, if this number is 0 and the
server sends a 302 redirect, the request method
will raise an exception. This parameter is used in
recursive request calls to avoid an infinite loop.
Any additional arguments are passed through to
atom.client.AtomPubClient.request.
Returns:
An HTTP response object (see atom.http_core.HttpResponse for a
description of the object's interface) if no converter was
specified and no desired_class was specified. If a converter function
was provided, the results of calling the converter are returned. If no
converter was specified but a desired_class was provided, the response
body will be converted to the class using
atom.core.parse.
"""
if isinstance(uri, (str, unicode)):
uri = atom.http_core.Uri.parse_uri(uri)
# Add the gsession ID to the URL to prevent further redirects.
# TODO: If different sessions are using the same client, there will be a
# multitude of redirects and session ID shuffling.
# If the gsession ID is in the URL, adopt it as the standard location.
if uri is not None and uri.query is not None and 'gsessionid' in uri.query:
self.__gsessionid = uri.query['gsessionid']
# The gsession ID could also be in the HTTP request.
elif (http_request is not None and http_request.uri is not None
and http_request.uri.query is not None
and 'gsessionid' in http_request.uri.query):
self.__gsessionid = http_request.uri.query['gsessionid']
# If the gsession ID is stored in the client, and was not present in the
# URI then add it to the URI.
elif self.__gsessionid is not None:
uri.query['gsessionid'] = self.__gsessionid
# The AtomPubClient should call this class' modify_request before
# performing the HTTP request.
#http_request = self.modify_request(http_request)
response = atom.client.AtomPubClient.request(self, method=method,
uri=uri, auth_token=auth_token, http_request=http_request, **kwargs)
# On success, convert the response body using the desired converter
# function if present.
if response is None:
return None
if response.status == 200 or response.status == 201:
if converter is not None:
return converter(response)
elif desired_class is not None:
if self.api_version is not None:
return atom.core.parse(response.read(), desired_class,
version=get_xml_version(self.api_version))
else:
# No API version was specified, so allow parse to
# use the default version.
return atom.core.parse(response.read(), desired_class)
else:
return response
# TODO: move the redirect logic into the Google Calendar client once it
# exists since the redirects are only used in the calendar API.
elif response.status == 302:
if redirects_remaining > 0:
location = (response.getheader('Location')
or response.getheader('location'))
if location is not None:
m = re.compile('[\?\&]gsessionid=(\w*)').search(location)
if m is not None:
self.__gsessionid = m.group(1)
# Make a recursive call with the gsession ID in the URI to follow
# the redirect.
return self.request(method=method, uri=uri, auth_token=auth_token,
http_request=http_request, converter=converter,
desired_class=desired_class,
redirects_remaining=redirects_remaining-1,
**kwargs)
else:
raise error_from_response('302 received without Location header',
response, RedirectError)
else:
raise error_from_response('Too many redirects from server',
response, RedirectError)
elif response.status == 401:
raise error_from_response('Unauthorized - Server responded with',
response, Unauthorized)
elif response.status == 304:
raise error_from_response('Entry Not Modified - Server responded with',
response, NotModified)
elif response.status == 501:
raise error_from_response(
'This API operation is not implemented. - Server responded with',
response, NotImplemented)
# If the server's response was not a 200, 201, 302, 304, 401, or 501, raise
# an exception.
else:
raise error_from_response('Server responded with', response,
RequestError)
Request = request
def request_client_login_token(
self, email, password, source, service=None,
account_type='HOSTED_OR_GOOGLE',
auth_url=atom.http_core.Uri.parse_uri(
'https://www.google.com/accounts/ClientLogin'),
captcha_token=None, captcha_response=None):
service = service or self.auth_service
# Set the target URL.
http_request = atom.http_core.HttpRequest(uri=auth_url, method='POST')
http_request.add_body_part(
gdata.gauth.generate_client_login_request_body(email=email,
password=password, service=service, source=source,
account_type=account_type, captcha_token=captcha_token,
captcha_response=captcha_response),
'application/x-www-form-urlencoded')
# Use the underlying http_client to make the request.
response = self.http_client.request(http_request)
response_body = response.read()
if response.status == 200:
token_string = gdata.gauth.get_client_login_token_string(response_body)
if token_string is not None:
return gdata.gauth.ClientLoginToken(token_string)
else:
raise ClientLoginTokenMissing(
'Recieved a 200 response to client login request,'
' but no token was present. %s' % (response_body,))
elif response.status == 403:
captcha_challenge = gdata.gauth.get_captcha_challenge(response_body)
if captcha_challenge:
challenge = CaptchaChallenge('CAPTCHA required')
challenge.captcha_url = captcha_challenge['url']
challenge.captcha_token = captcha_challenge['token']
raise challenge
elif response_body.splitlines()[0] == 'Error=BadAuthentication':
raise BadAuthentication('Incorrect username or password')
else:
raise error_from_response('Server responded with a 403 code',
response, RequestError, response_body)
elif response.status == 302:
# Google tries to redirect all bad URLs back to
# http://www.google.<locale>. If a redirect
# attempt is made, assume the user has supplied an incorrect
# authentication URL
raise error_from_response('Server responded with a redirect',
response, BadAuthenticationServiceURL,
response_body)
else:
raise error_from_response('Server responded to ClientLogin request',
response, ClientLoginFailed, response_body)
RequestClientLoginToken = request_client_login_token
def client_login(self, email, password, source, service=None,
account_type='HOSTED_OR_GOOGLE',
auth_url=atom.http_core.Uri.parse_uri(
'https://www.google.com/accounts/ClientLogin'),
captcha_token=None, captcha_response=None):
"""Performs an auth request using the user's email address and password.
In order to modify user specific data and read user private data, your
application must be authorized by the user. One way to demonstrage
authorization is by including a Client Login token in the Authorization
HTTP header of all requests. This method requests the Client Login token
by sending the user's email address, password, the name of the
application, and the service code for the service which will be accessed
by the application. If the username and password are correct, the server
will respond with the client login code and a new ClientLoginToken
object will be set in the client's auth_token member. With the auth_token
set, future requests from this client will include the Client Login
token.
For a list of service names, see
http://code.google.com/apis/gdata/faq.html#clientlogin
For more information on Client Login, see:
http://code.google.com/apis/accounts/docs/AuthForInstalledApps.html
Args:
email: str The user's email address or username.
password: str The password for the user's account.
source: str The name of your application. This can be anything you
like but should should give some indication of which app is
making the request.
service: str The service code for the service you would like to access.
For example, 'cp' for contacts, 'cl' for calendar. For a full
list see
http://code.google.com/apis/gdata/faq.html#clientlogin
If you are using a subclass of the gdata.client.GDClient, the
service will usually be filled in for you so you do not need
to specify it. For example see BloggerClient,
SpreadsheetsClient, etc.
account_type: str (optional) The type of account which is being
authenticated. This can be either 'GOOGLE' for a Google
Account, 'HOSTED' for a Google Apps Account, or the
default 'HOSTED_OR_GOOGLE' which will select the Google
Apps Account if the same email address is used for both
a Google Account and a Google Apps Account.
auth_url: str (optional) The URL to which the login request should be
sent.
captcha_token: str (optional) If a previous login attempt was reponded
to with a CAPTCHA challenge, this is the token which
identifies the challenge (from the CAPTCHA's URL).
captcha_response: str (optional) If a previous login attempt was
reponded to with a CAPTCHA challenge, this is the
response text which was contained in the challenge.
Returns:
None
Raises:
A RequestError or one of its suclasses: BadAuthentication,
BadAuthenticationServiceURL, ClientLoginFailed,
ClientLoginTokenMissing, or CaptchaChallenge
"""
service = service or self.auth_service
self.auth_token = self.request_client_login_token(email, password,
source, service=service, account_type=account_type, auth_url=auth_url,
captcha_token=captcha_token, captcha_response=captcha_response)
ClientLogin = client_login
def upgrade_token(self, token=None, url=atom.http_core.Uri.parse_uri(
'https://www.google.com/accounts/AuthSubSessionToken')):
"""Asks the Google auth server for a multi-use AuthSub token.
For details on AuthSub, see:
http://code.google.com/apis/accounts/docs/AuthSub.html
Args:
token: gdata.gauth.AuthSubToken or gdata.gauth.SecureAuthSubToken
(optional) If no token is passed in, the client's auth_token member
is used to request the new token. The token object will be modified
to contain the new session token string.
url: str or atom.http_core.Uri (optional) The URL to which the token
upgrade request should be sent. Defaults to:
https://www.google.com/accounts/AuthSubSessionToken
Returns:
The upgraded gdata.gauth.AuthSubToken object.
"""
# Default to using the auth_token member if no token is provided.
if token is None:
token = self.auth_token
# We cannot upgrade a None token.
if token is None:
raise UnableToUpgradeToken('No token was provided.')
if not isinstance(token, gdata.gauth.AuthSubToken):
raise UnableToUpgradeToken(
'Cannot upgrade the token because it is not an AuthSubToken object.')
http_request = atom.http_core.HttpRequest(uri=url, method='GET')
token.modify_request(http_request)
# Use the lower level HttpClient to make the request.
response = self.http_client.request(http_request)
if response.status == 200:
token._upgrade_token(response.read())
return token
else:
raise UnableToUpgradeToken(
'Server responded to token upgrade request with %s: %s' % (
response.status, response.read()))
UpgradeToken = upgrade_token
def revoke_token(self, token=None, url=atom.http_core.Uri.parse_uri(
'https://www.google.com/accounts/AuthSubRevokeToken')):
"""Requests that the token be invalidated.
This method can be used for both AuthSub and OAuth tokens (to invalidate
a ClientLogin token, the user must change their password).
Returns:
True if the server responded with a 200.
Raises:
A RequestError if the server responds with a non-200 status.
"""
# Default to using the auth_token member if no token is provided.
if token is None:
token = self.auth_token
http_request = atom.http_core.HttpRequest(uri=url, method='GET')
token.modify_request(http_request)
response = self.http_client.request(http_request)
if response.status != 200:
raise error_from_response('Server sent non-200 to revoke token',
response, RequestError, response.read())
return True
RevokeToken = revoke_token
def get_oauth_token(self, scopes, next, consumer_key, consumer_secret=None,
rsa_private_key=None,
url=gdata.gauth.REQUEST_TOKEN_URL):
"""Obtains an OAuth request token to allow the user to authorize this app.
Once this client has a request token, the user can authorize the request
token by visiting the authorization URL in their browser. After being
redirected back to this app at the 'next' URL, this app can then exchange
the authorized request token for an access token.
For more information see the documentation on Google Accounts with OAuth:
http://code.google.com/apis/accounts/docs/OAuth.html#AuthProcess
Args:
scopes: list of strings or atom.http_core.Uri objects which specify the
URL prefixes which this app will be accessing. For example, to access
the Google Calendar API, you would want to use scopes:
['https://www.google.com/calendar/feeds/',
'http://www.google.com/calendar/feeds/']
next: str or atom.http_core.Uri object, The URL which the user's browser
should be sent to after they authorize access to their data. This
should be a URL in your application which will read the token
information from the URL and upgrade the request token to an access
token.
consumer_key: str This is the identifier for this application which you
should have received when you registered your application with Google
to use OAuth.
consumer_secret: str (optional) The shared secret between your app and
Google which provides evidence that this request is coming from you
application and not another app. If present, this libraries assumes
you want to use an HMAC signature to verify requests. Keep this data
a secret.
rsa_private_key: str (optional) The RSA private key which is used to
generate a digital signature which is checked by Google's server. If
present, this library assumes that you want to use an RSA signature
to verify requests. Keep this data a secret.
url: The URL to which a request for a token should be made. The default
is Google's OAuth request token provider.
"""
http_request = None
if rsa_private_key is not None:
http_request = gdata.gauth.generate_request_for_request_token(
consumer_key, gdata.gauth.RSA_SHA1, scopes,
rsa_key=rsa_private_key, auth_server_url=url, next=next)
elif consumer_secret is not None:
http_request = gdata.gauth.generate_request_for_request_token(
consumer_key, gdata.gauth.HMAC_SHA1, scopes,
consumer_secret=consumer_secret, auth_server_url=url, next=next)
else:
raise MissingOAuthParameters(
'To request an OAuth token, you must provide your consumer secret'
' or your private RSA key.')
response = self.http_client.request(http_request)
response_body = response.read()
if response.status != 200:
raise error_from_response('Unable to obtain OAuth request token',
response, RequestError, response_body)
if rsa_private_key is not None:
return gdata.gauth.rsa_token_from_body(response_body, consumer_key,
rsa_private_key,
gdata.gauth.REQUEST_TOKEN)
elif consumer_secret is not None:
return gdata.gauth.hmac_token_from_body(response_body, consumer_key,
consumer_secret,
gdata.gauth.REQUEST_TOKEN)
GetOAuthToken = get_oauth_token
def get_access_token(self, request_token,
url=gdata.gauth.ACCESS_TOKEN_URL):
"""Exchanges an authorized OAuth request token for an access token.
Contacts the Google OAuth server to upgrade a previously authorized
request token. Once the request token is upgraded to an access token,
the access token may be used to access the user's data.
For more details, see the Google Accounts OAuth documentation:
http://code.google.com/apis/accounts/docs/OAuth.html#AccessToken
Args:
request_token: An OAuth token which has been authorized by the user.
url: (optional) The URL to which the upgrade request should be sent.
Defaults to: https://www.google.com/accounts/OAuthAuthorizeToken
"""
http_request = gdata.gauth.generate_request_for_access_token(
request_token, auth_server_url=url)
response = self.http_client.request(http_request)
response_body = response.read()
if response.status != 200:
raise error_from_response(
'Unable to upgrade OAuth request token to access token',
response, RequestError, response_body)
return gdata.gauth.upgrade_to_access_token(request_token, response_body)
GetAccessToken = get_access_token
def modify_request(self, http_request):
"""Adds or changes request before making the HTTP request.
This client will add the API version if it is specified.
Subclasses may override this method to add their own request
modifications before the request is made.
"""
http_request = atom.client.AtomPubClient.modify_request(self,
http_request)
if self.api_version is not None:
http_request.headers['GData-Version'] = self.api_version
return http_request
ModifyRequest = modify_request
def get_feed(self, uri, auth_token=None, converter=None,
desired_class=gdata.data.GDFeed, **kwargs):
return self.request(method='GET', uri=uri, auth_token=auth_token,
converter=converter, desired_class=desired_class,
**kwargs)
GetFeed = get_feed
def get_entry(self, uri, auth_token=None, converter=None,
desired_class=gdata.data.GDEntry, etag=None, **kwargs):
http_request = atom.http_core.HttpRequest()
# Conditional retrieval
if etag is not None:
http_request.headers['If-None-Match'] = etag
return self.request(method='GET', uri=uri, auth_token=auth_token,
http_request=http_request, converter=converter,
desired_class=desired_class, **kwargs)
GetEntry = get_entry
def get_next(self, feed, auth_token=None, converter=None,
desired_class=None, **kwargs):
"""Fetches the next set of results from the feed.
When requesting a feed, the number of entries returned is capped at a
service specific default limit (often 25 entries). You can specify your
own entry-count cap using the max-results URL query parameter. If there
are more results than could fit under max-results, the feed will contain
a next link. This method performs a GET against this next results URL.
Returns:
A new feed object containing the next set of entries in this feed.
"""
if converter is None and desired_class is None:
desired_class = feed.__class__
return self.get_feed(feed.find_next_link(), auth_token=auth_token,
converter=converter, desired_class=desired_class,
**kwargs)
GetNext = get_next
# TODO: add a refresh method to re-fetch the entry/feed from the server
# if it has been updated.
def post(self, entry, uri, auth_token=None, converter=None,
desired_class=None, **kwargs):
if converter is None and desired_class is None:
desired_class = entry.__class__
http_request = atom.http_core.HttpRequest()
http_request.add_body_part(
entry.to_string(get_xml_version(self.api_version)),
'application/atom+xml')
return self.request(method='POST', uri=uri, auth_token=auth_token,
http_request=http_request, converter=converter,
desired_class=desired_class, **kwargs)
Post = post
def update(self, entry, auth_token=None, force=False, uri=None, **kwargs):
"""Edits the entry on the server by sending the XML for this entry.
Performs a PUT and converts the response to a new entry object with a
matching class to the entry passed in.
Args:
entry:
auth_token:
force: boolean stating whether an update should be forced. Defaults to
False. Normally, if a change has been made since the passed in
entry was obtained, the server will not overwrite the entry since
the changes were based on an obsolete version of the entry.
Setting force to True will cause the update to silently
overwrite whatever version is present.
uri: The uri to put to. If provided, this uri is PUT to rather than the
inferred uri from the entry's edit link.
Returns:
A new Entry object of a matching type to the entry which was passed in.
"""
http_request = atom.http_core.HttpRequest()
http_request.add_body_part(
entry.to_string(get_xml_version(self.api_version)),
'application/atom+xml')
# Include the ETag in the request if present.
if force:
http_request.headers['If-Match'] = '*'
elif hasattr(entry, 'etag') and entry.etag:
http_request.headers['If-Match'] = entry.etag
if uri is None:
uri = entry.find_edit_link()
return self.request(method='PUT', uri=uri, auth_token=auth_token,
http_request=http_request,
desired_class=entry.__class__, **kwargs)
Update = update
def delete(self, entry_or_uri, auth_token=None, force=False, **kwargs):
http_request = atom.http_core.HttpRequest()
# Include the ETag in the request if present.
if force:
http_request.headers['If-Match'] = '*'
elif hasattr(entry_or_uri, 'etag') and entry_or_uri.etag:
http_request.headers['If-Match'] = entry_or_uri.etag
# If the user passes in a URL, just delete directly, may not work as
# the service might require an ETag.
if isinstance(entry_or_uri, (str, unicode, atom.http_core.Uri)):
return self.request(method='DELETE', uri=entry_or_uri,
http_request=http_request, auth_token=auth_token,
**kwargs)
return self.request(method='DELETE', uri=entry_or_uri.find_edit_link(),
http_request=http_request, auth_token=auth_token,
**kwargs)
Delete = delete
#TODO: implement batch requests.
#def batch(feed, uri, auth_token=None, converter=None, **kwargs):
# pass
# TODO: add a refresh method to request a conditional update to an entry
# or feed.
def _add_query_param(param_string, value, http_request):
if value:
http_request.uri.query[param_string] = value
class Query(object):
def __init__(self, text_query=None, categories=None, author=None, alt=None,
updated_min=None, updated_max=None, pretty_print=False,
published_min=None, published_max=None, start_index=None,
max_results=None, strict=False):
"""Constructs a Google Data Query to filter feed contents serverside.
Args:
text_query: Full text search str (optional)
categories: list of strings (optional). Each string is a required
category. To include an 'or' query, put a | in the string between
terms. For example, to find everything in the Fitz category and
the Laurie or Jane category (Fitz and (Laurie or Jane)) you would
set categories to ['Fitz', 'Laurie|Jane'].
author: str (optional) The service returns entries where the author
name and/or email address match your query string.
alt: str (optional) for the Alternative representation type you'd like
the feed in. If you don't specify an alt parameter, the service
returns an Atom feed. This is equivalent to alt='atom'.
alt='rss' returns an RSS 2.0 result feed.
alt='json' returns a JSON representation of the feed.
alt='json-in-script' Requests a response that wraps JSON in a script
tag.
alt='atom-in-script' Requests an Atom response that wraps an XML
string in a script tag.
alt='rss-in-script' Requests an RSS response that wraps an XML
string in a script tag.
updated_min: str (optional), RFC 3339 timestamp format, lower bounds.
For example: 2005-08-09T10:57:00-08:00
updated_max: str (optional) updated time must be earlier than timestamp.
pretty_print: boolean (optional) If True the server's XML response will
be indented to make it more human readable. Defaults to False.
published_min: str (optional), Similar to updated_min but for published
time.
published_max: str (optional), Similar to updated_max but for published
time.
start_index: int or str (optional) 1-based index of the first result to
be retrieved. Note that this isn't a general cursoring mechanism.
If you first send a query with ?start-index=1&max-results=10 and
then send another query with ?start-index=11&max-results=10, the
service cannot guarantee that the results are equivalent to
?start-index=1&max-results=20, because insertions and deletions
could have taken place in between the two queries.
max_results: int or str (optional) Maximum number of results to be
retrieved. Each service has a default max (usually 25) which can
vary from service to service. There is also a service-specific
limit to the max_results you can fetch in a request.
strict: boolean (optional) If True, the server will return an error if
the server does not recognize any of the parameters in the request
URL. Defaults to False.
"""
self.text_query = text_query
self.categories = categories or []
self.author = author
self.alt = alt
self.updated_min = updated_min
self.updated_max = updated_max
self.pretty_print = pretty_print
self.published_min = published_min
self.published_max = published_max
self.start_index = start_index
self.max_results = max_results
self.strict = strict
def modify_request(self, http_request):
_add_query_param('q', self.text_query, http_request)
if self.categories:
http_request.uri.query['category'] = ','.join(self.categories)
_add_query_param('author', self.author, http_request)
_add_query_param('alt', self.alt, http_request)
_add_query_param('updated-min', self.updated_min, http_request)
_add_query_param('updated-max', self.updated_max, http_request)
if self.pretty_print:
http_request.uri.query['prettyprint'] = 'true'
_add_query_param('published-min', self.published_min, http_request)
_add_query_param('published-max', self.published_max, http_request)
if self.start_index is not None:
http_request.uri.query['start-index'] = str(self.start_index)
if self.max_results is not None:
http_request.uri.query['max-results'] = str(self.max_results)
if self.strict:
http_request.uri.query['strict'] = 'true'
ModifyRequest = modify_request
class GDQuery(atom.http_core.Uri):
def _get_text_query(self):
return self.query['q']
def _set_text_query(self, value):
self.query['q'] = value
text_query = property(_get_text_query, _set_text_query,
doc='The q parameter for searching for an exact text match on content')
class ResumableUploader(object):
"""Resumable upload helper for the Google Data protocol."""
DEFAULT_CHUNK_SIZE = 5242880 # 5MB
def __init__(self, client, file_handle, content_type, total_file_size,
chunk_size=None, desired_class=None):
"""Starts a resumable upload to a service that supports the protocol.
Args:
client: gdata.client.GDClient A Google Data API service.
file_handle: object A file-like object containing the file to upload.
content_type: str The mimetype of the file to upload.
total_file_size: int The file's total size in bytes.
chunk_size: int The size of each upload chunk. If None, the
DEFAULT_CHUNK_SIZE will be used.
desired_class: object (optional) The type of gdata.data.GDEntry to parse
the completed entry as. This should be specific to the API.
"""
self.client = client
self.file_handle = file_handle
self.content_type = content_type
self.total_file_size = total_file_size
self.chunk_size = chunk_size or self.DEFAULT_CHUNK_SIZE
self.desired_class = desired_class or gdata.data.GDEntry
self.upload_uri = None
# Send the entire file if the chunk size is less than fize's total size.
if self.total_file_size <= self.chunk_size:
self.chunk_size = total_file_size
def _init_session(self, resumable_media_link, entry=None, headers=None,
auth_token=None):
"""Starts a new resumable upload to a service that supports the protocol.
The method makes a request to initiate a new upload session. The unique
upload uri returned by the server (and set in this method) should be used
to send upload chunks to the server.
Args:
resumable_media_link: str The full URL for the #resumable-create-media or
#resumable-edit-media link for starting a resumable upload request or
updating media using a resumable PUT.
entry: A (optional) gdata.data.GDEntry containging metadata to create the
upload from.
headers: dict (optional) Additional headers to send in the initial request
to create the resumable upload request. These headers will override
any default headers sent in the request. For example:
headers={'Slug': 'MyTitle'}.
auth_token: (optional) An object which sets the Authorization HTTP header
in its modify_request method. Recommended classes include
gdata.gauth.ClientLoginToken and gdata.gauth.AuthSubToken
among others.
Returns:
The final Atom entry as created on the server. The entry will be
parsed accoring to the class specified in self.desired_class.
Raises:
RequestError if the unique upload uri is not set or the
server returns something other than an HTTP 308 when the upload is
incomplete.
"""
http_request = atom.http_core.HttpRequest()
# Send empty POST if Atom XML wasn't specified.
if entry is None:
http_request.add_body_part('', self.content_type, size=0)
else:
http_request.add_body_part(str(entry), 'application/atom+xml',
size=len(str(entry)))
http_request.headers['X-Upload-Content-Type'] = self.content_type
http_request.headers['X-Upload-Content-Length'] = self.total_file_size
if headers is not None:
http_request.headers.update(headers)
response = self.client.request(method='POST',
uri=resumable_media_link,
auth_token=auth_token,
http_request=http_request)
self.upload_uri = (response.getheader('location') or
response.getheader('Location'))
_InitSession = _init_session
def upload_chunk(self, start_byte, content_bytes):
"""Uploads a byte range (chunk) to the resumable upload server.
Args:
start_byte: int The byte offset of the total file where the byte range
passed in lives.
content_bytes: str The file contents of this chunk.
Returns:
The final Atom entry created on the server. The entry object's type will
be the class specified in self.desired_class.
Raises:
RequestError if the unique upload uri is not set or the
server returns something other than an HTTP 308 when the upload is
incomplete.
"""
if self.upload_uri is None:
raise RequestError('Resumable upload request not initialized.')
# Adjustment if last byte range is less than defined chunk size.
chunk_size = self.chunk_size
if len(content_bytes) <= chunk_size:
chunk_size = len(content_bytes)
http_request = atom.http_core.HttpRequest()
http_request.add_body_part(content_bytes, self.content_type,
size=len(content_bytes))
http_request.headers['Content-Range'] = ('bytes %s-%s/%s'
% (start_byte,
start_byte + chunk_size - 1,
self.total_file_size))
try:
response = self.client.request(method='POST', uri=self.upload_uri,
http_request=http_request,
desired_class=self.desired_class)
return response
except RequestError, error:
if error.status == 308:
return None
else:
raise error
UploadChunk = upload_chunk
def upload_file(self, resumable_media_link, entry=None, headers=None,
auth_token=None):
"""Uploads an entire file in chunks using the resumable upload protocol.
If you are interested in pausing an upload or controlling the chunking
yourself, use the upload_chunk() method instead.
Args:
resumable_media_link: str The full URL for the #resumable-create-media for
starting a resumable upload request.
entry: A (optional) gdata.data.GDEntry containging metadata to create the
upload from.
headers: dict Additional headers to send in the initial request to create
the resumable upload request. These headers will override any default
headers sent in the request. For example: headers={'Slug': 'MyTitle'}.
auth_token: (optional) An object which sets the Authorization HTTP header
in its modify_request method. Recommended classes include
gdata.gauth.ClientLoginToken and gdata.gauth.AuthSubToken
among others.
Returns:
The final Atom entry created on the server. The entry object's type will
be the class specified in self.desired_class.
Raises:
RequestError if anything other than a HTTP 308 is returned
when the request raises an exception.
"""
self._init_session(resumable_media_link, headers=headers,
auth_token=auth_token, entry=entry)
start_byte = 0
entry = None
while not entry:
entry = self.upload_chunk(
start_byte, self.file_handle.read(self.chunk_size))
start_byte += self.chunk_size
return entry
UploadFile = upload_file
def update_file(self, entry_or_resumable_edit_link, headers=None, force=False,
auth_token=None):
"""Updates the contents of an existing file using the resumable protocol.
If you are interested in pausing an upload or controlling the chunking
yourself, use the upload_chunk() method instead.
Args:
entry_or_resumable_edit_link: object or string A gdata.data.GDEntry for
the entry/file to update or the full uri of the link with rel
#resumable-edit-media.
headers: dict Additional headers to send in the initial request to create
the resumable upload request. These headers will override any default
headers sent in the request. For example: headers={'Slug': 'MyTitle'}.
force boolean (optional) True to force an update and set the If-Match
header to '*'. If False and entry_or_resumable_edit_link is a
gdata.data.GDEntry object, its etag value is used. Otherwise this
parameter should be set to True to force the update.
auth_token: (optional) An object which sets the Authorization HTTP header
in its modify_request method. Recommended classes include
gdata.gauth.ClientLoginToken and gdata.gauth.AuthSubToken
among others.
Returns:
The final Atom entry created on the server. The entry object's type will
be the class specified in self.desired_class.
Raises:
RequestError if anything other than a HTTP 308 is returned
when the request raises an exception.
"""
# Need to override the POST request for a resumable update (required).
customer_headers = {'X-HTTP-Method-Override': 'PUT'}
if headers is not None:
customer_headers.update(headers)
if isinstance(entry_or_resumable_edit_link, gdata.data.GDEntry):
resumable_edit_link = entry_or_resumable_edit_link.find_url(
'http://schemas.google.com/g/2005#resumable-edit-media')
customer_headers['If-Match'] = entry_or_resumable_edit_link.etag
else:
resumable_edit_link = entry_or_resumable_edit_link
if force:
customer_headers['If-Match'] = '*'
return self.upload_file(resumable_edit_link, headers=customer_headers,
auth_token=auth_token)
UpdateFile = update_file
def query_upload_status(self, uri=None):
"""Queries the current status of a resumable upload request.
Args:
uri: str (optional) A resumable upload uri to query and override the one
that is set in this object.
Returns:
An integer representing the file position (byte) to resume the upload from
or True if the upload is complete.
Raises:
RequestError if anything other than a HTTP 308 is returned
when the request raises an exception.
"""
# Override object's unique upload uri.
if uri is None:
uri = self.upload_uri
http_request = atom.http_core.HttpRequest()
http_request.headers['Content-Length'] = '0'
http_request.headers['Content-Range'] = 'bytes */%s' % self.total_file_size
try:
response = self.client.request(
method='POST', uri=uri, http_request=http_request)
if response.status == 201:
return True
else:
raise error_from_response(
'%s returned by server' % response.status, response, RequestError)
except RequestError, error:
if error.status == 308:
for pair in error.headers:
if pair[0].capitalize() == 'Range':
return int(pair[1].split('-')[1]) + 1
else:
raise error
QueryUploadStatus = query_upload_status