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"""
Google OpenId, OAuth2, OAuth1, Google+ Sign-in backends, docs at:
    http://psa.matiasaguirre.net/docs/backends/google.html
"""
from social.utils import handle_http_errors
from social.backends.open_id import OpenIdAuth, OpenIdConnectAuth
from social.backends.oauth import BaseOAuth2, BaseOAuth1
from social.exceptions import AuthMissingParameter


class BaseGoogleAuth(object):
    def get_user_id(self, details, response):
        """Use google email as unique id"""
        if self.setting('USE_UNIQUE_USER_ID', False):
            return response['id']
        else:
            return details['email']

    def get_user_details(self, response):
        """Return user details from Google API account"""
        if 'email' in response:
            email = response['email']
        elif 'emails' in response:
            email = response['emails'][0]['value']
        else:
            email = ''

        if isinstance(response.get('name'), dict):
            names = response.get('name') or {}
            name, given_name, family_name = (
                response.get('displayName', ''),
                names.get('givenName', ''),
                names.get('familyName', '')
            )
        else:
            name, given_name, family_name = (
                response.get('name', ''),
                response.get('given_name', ''),
                response.get('family_name', '')
            )

        fullname, first_name, last_name = self.get_user_names(
            name, given_name, family_name
        )
        return {'username': email.split('@', 1)[0],
                'email': email,
                'fullname': fullname,
                'first_name': first_name,
                'last_name': last_name}


class BaseGoogleOAuth2API(BaseGoogleAuth):
    def get_scope(self):
        """Return list with needed access scope"""
        scope = self.setting('SCOPE', [])
        if not self.setting('IGNORE_DEFAULT_SCOPE', False):
            default_scope = []
            if self.setting('USE_DEPRECATED_API', False):
                default_scope = self.DEPRECATED_DEFAULT_SCOPE
            else:
                default_scope = self.DEFAULT_SCOPE
            scope = scope + (default_scope or [])
        return scope

    def user_data(self, access_token, *args, **kwargs):
        """Return user data from Google API"""
        if self.setting('USE_DEPRECATED_API', False):
            url = 'https://www.googleapis.com/oauth2/v1/userinfo'
        else:
            url = 'https://www.googleapis.com/plus/v1/people/me'
        return self.get_json(url, params={
            'access_token': access_token,
            'alt': 'json'
        })

    def revoke_token_params(self, token, uid):
        return {'token': token}

    def revoke_token_headers(self, token, uid):
        return {'Content-type': 'application/json'}


class GoogleOAuth2(BaseGoogleOAuth2API, BaseOAuth2):
    """Google OAuth2 authentication backend"""
    name = 'google-oauth2'
    REDIRECT_STATE = False
    AUTHORIZATION_URL = 'https://accounts.google.com/o/oauth2/auth'
    ACCESS_TOKEN_URL = 'https://accounts.google.com/o/oauth2/token'
    ACCESS_TOKEN_METHOD = 'POST'
    REVOKE_TOKEN_URL = 'https://accounts.google.com/o/oauth2/revoke'
    REVOKE_TOKEN_METHOD = 'GET'
    # The order of the default scope is important
    DEFAULT_SCOPE = ['openid', 'email', 'profile']
    DEPRECATED_DEFAULT_SCOPE = [
        'https://www.googleapis.com/auth/userinfo.email',
        'https://www.googleapis.com/auth/userinfo.profile'
    ]
    EXTRA_DATA = [
        ('refresh_token', 'refresh_token', True),
        ('expires_in', 'expires'),
        ('token_type', 'token_type', True)
    ]


class GooglePlusAuth(BaseGoogleOAuth2API, BaseOAuth2):
    name = 'google-plus'
    REDIRECT_STATE = False
    STATE_PARAMETER = False
    AUTHORIZATION_URL = 'https://accounts.google.com/o/oauth2/auth'
    ACCESS_TOKEN_URL = 'https://accounts.google.com/o/oauth2/token'
    ACCESS_TOKEN_METHOD = 'POST'
    REVOKE_TOKEN_URL = 'https://accounts.google.com/o/oauth2/revoke'
    REVOKE_TOKEN_METHOD = 'GET'
    DEFAULT_SCOPE = [
        'https://www.googleapis.com/auth/plus.login',
        'https://www.googleapis.com/auth/plus.me',
    ]
    DEPRECATED_DEFAULT_SCOPE = [
        'https://www.googleapis.com/auth/plus.login',
        'https://www.googleapis.com/auth/userinfo.email',
        'https://www.googleapis.com/auth/userinfo.profile'
    ]
    EXTRA_DATA = [
        ('id', 'user_id'),
        ('refresh_token', 'refresh_token', True),
        ('expires_in', 'expires'),
        ('access_type', 'access_type', True),
        ('code', 'code')
    ]

    def auth_complete_params(self, state=None):
        params = super(GooglePlusAuth, self).auth_complete_params(state)
        if self.data.get('access_token'):
            # Don't add postmessage if this is plain server-side workflow
            params['redirect_uri'] = 'postmessage'
        return params

    @handle_http_errors
    def auth_complete(self, *args, **kwargs):
        if 'access_token' in self.data:  # Client-side workflow
            token = self.data.get('access_token')
            response = self.get_json(
                'https://www.googleapis.com/oauth2/v1/tokeninfo',
                params={'access_token': token}
            )
            self.process_error(response)
            return self.do_auth(token, response=response, *args, **kwargs)
        elif 'code' in self.data:  # Server-side workflow
            response = self.request_access_token(
                self.ACCESS_TOKEN_URL,
                data=self.auth_complete_params(),
                headers=self.auth_headers(),
                method=self.ACCESS_TOKEN_METHOD
            )
            self.process_error(response)
            return self.do_auth(response['access_token'],
                                response=response,
                                *args, **kwargs)
        else:
            raise AuthMissingParameter(self, 'access_token or code')


class GoogleOAuth(BaseGoogleAuth, BaseOAuth1):
    """Google OAuth authorization mechanism"""
    name = 'google-oauth'
    AUTHORIZATION_URL = 'https://www.google.com/accounts/OAuthAuthorizeToken'
    REQUEST_TOKEN_URL = 'https://www.google.com/accounts/OAuthGetRequestToken'
    ACCESS_TOKEN_URL = 'https://www.google.com/accounts/OAuthGetAccessToken'
    DEFAULT_SCOPE = ['https://www.googleapis.com/auth/userinfo#email']

    def user_data(self, access_token, *args, **kwargs):
        """Return user data from Google API"""
        return self.get_querystring(
            'https://www.googleapis.com/userinfo/email',
            auth=self.oauth_auth(access_token)
        )

    def get_key_and_secret(self):
        """Return Google OAuth Consumer Key and Consumer Secret pair, uses
        anonymous by default, beware that this marks the application as not
        registered and a security badge is displayed on authorization page.
        http://code.google.com/apis/accounts/docs/OAuth_ref.html#SigningOAuth
        """
        key_secret = super(GoogleOAuth, self).get_key_and_secret()
        if key_secret == (None, None):
            key_secret = ('anonymous', 'anonymous')
        return key_secret


class GoogleOpenId(OpenIdAuth):
    name = 'google'
    URL = 'https://www.google.com/accounts/o8/id'

    def get_user_id(self, details, response):
        """
        Return user unique id provided by service. For google user email
        is unique enought to flag a single user. Email comes from schema:
        http://axschema.org/contact/email
        """
        return details['email']


class GoogleOpenIdConnect(GoogleOAuth2, OpenIdConnectAuth):
    name = 'google-openidconnect'
    ID_TOKEN_ISSUER = "accounts.google.com"

    def user_data(self, access_token, *args, **kwargs):
        """Return user data from Google API"""
        return self.get_json(
            'https://www.googleapis.com/plus/v1/people/me/openIdConnect',
            params={'access_token': access_token, 'alt': 'json'}
        )