def get_access_token_for_id(gplus_id):
"""Get an access token for an id, potentially via refresh token if necessary."""
# Check the cache first.
token = Cache.get(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % gplus_id)
if token:
return token
# If we don't have a cached token, see if we have a refresh token available.
refresh_token = TokenIdMapping.lookup_refresh_token(gplus_id)
if not refresh_token:
raise UnavailableException(
'No tokens available for G+ id %s.' % gplus_id, 401)
data = {
'client_id': Config.get('oauth', 'client-id'),
'client_secret': Config.get('oauth', 'client-secret'),
'refresh_token': refresh_token,
'grant_type': 'refresh_token',
}
try:
response = session.post(OAUTH2_BASE + '/token',
data=data,
timeout=GOOGLE_API_TIMEOUT)
result = response.json()
except requests.exceptions.Timeout:
raise UnavailableException('Access token API request timed out.', 504)
except Exception as e:
raise UnavailableException(
'Access token API request raised exception "%r".' % e, 502)
if 'invalid_grant' in result:
# The provided refresh token is invalid which means the user has revoked
# access to their content - thus, pluss should forget about them.
Cache.delete(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % gplus_id)
Cache.delete(PROFILE_CACHE_KEY_TEMPLATE % gplus_id)
TokenIdMapping.remove_id(gplus_id)
raise UnvailableException('Access revoked for G+ id %s.' % gplus_id)
elif response.status_code != 200:
app.logger.error(
'Non-200 response to access token refresh request (%s): "%r".',
response.status_code, result)
raise UnavailableException(
'Failed to refresh access token for G+ id %s.' % gplus_id, 502)
elif result.get('token_type') != 'Bearer':
app.logger.error('Unknown token type "%s" refreshed for G+ id %s.',
result.get('token_type'), gplus_id)
raise UnavailableException(
'Failed to refresh access token for G+ id %s.' % gplus_id, 502)
token = result['access_token']
Cache.set(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % gplus_id,
token,
time=result['expires_in'])
return token
def get_access_token_for_id(gplus_id):
"""Get an access token for an id, potentially via refresh token if necessary."""
# Check the cache first.
token = Cache.get(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % gplus_id)
if token:
return token
# If we don't have a cached token, see if we have a refresh token available.
refresh_token = TokenIdMapping.lookup_refresh_token(gplus_id)
if not refresh_token:
raise UnavailableException('No tokens available for G+ id %s.' % gplus_id, 401)
data = {
'client_id': Config.get('oauth', 'client-id'),
'client_secret': Config.get('oauth', 'client-secret'),
'refresh_token': refresh_token,
'grant_type': 'refresh_token',
}
try:
response = session.post(OAUTH2_BASE + '/token', data=data, timeout=GOOGLE_API_TIMEOUT)
result = response.json()
except requests.exceptions.Timeout:
raise UnavailableException('Access token API request timed out.', 504)
except Exception as e:
raise UnavailableException('Access token API request raised exception "%r".' % e, 502)
if 'invalid_grant' in result or ('error' in result and result['error'] == 'invalid_grant'):
# The provided refresh token is invalid which means the user has revoked
# access to their content - thus, pluss should forget about them.
Cache.delete(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % gplus_id)
Cache.delete(PROFILE_CACHE_KEY_TEMPLATE % gplus_id)
TokenIdMapping.remove_id(gplus_id)
raise UnavailableException('Access revoked for G+ id %s.' % gplus_id, 502)
elif response.status_code != 200:
app.logger.error('Non-200 response to access token refresh request (%s): "%r".',
response.status_code, result)
raise UnavailableException('Failed to refresh access token for G+ id %s.' % gplus_id, 502)
elif result.get('token_type') != 'Bearer':
app.logger.error('Unknown token type "%s" refreshed for G+ id %s.', result.get('token_type'), gplus_id)
raise UnavailableException('Failed to refresh access token for G+ id %s.' % gplus_id, 502)
token = result['access_token']
Cache.set(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % gplus_id, token, time=result['expires_in'])
return token
def main():
"""Display the homepage."""
gplus_id = flask.request.cookies.get('gplus_id')
if gplus_id:
# If we lost rights, but someone still has the cookie, get rid of it.
if not TokenIdMapping.lookup_refresh_token(gplus_id):
return flask.redirect(flask.url_for('clear'))
# Display a page indicating the user's feed URL, since they've authed.
return flask.render_template('authed_main.html', datetime=datetime, gplus_id=gplus_id,
feed_url=full_url_for('user_atom', gplus_id=gplus_id))
else:
return flask.render_template('main.html', datetime=datetime)
def main():
"""Display the homepage."""
gplus_id = flask.request.cookies.get('gplus_id')
if gplus_id:
# If we lost rights, but someone still has the cookie, get rid of it.
if not TokenIdMapping.lookup_refresh_token(gplus_id):
return flask.redirect(flask.url_for('clear'))
# Display a page indicating the user's feed URL, since they've authed.
return flask.render_template('authed_main.html',
datetime=datetime,
gplus_id=gplus_id,
feed_url=full_url_for('user_atom',
gplus_id=gplus_id))
else:
return flask.render_template('main.html', datetime=datetime)
def oauth2():
"""Google redirects the user back to this endpoint to continue the OAuth2 flow."""
# Check for errors from the OAuth2 process
err = flask.request.args.get('error')
if err == 'access_denied':
return flask.redirect(flask.url_for('denied'))
elif err is not None:
app.logger.warning("OAuth2 callback received error: %s", err)
# TODO: handle this better (flash message?)
message = 'Whoops, something went wrong (error=%s). Please try again later.'
return message % flask.escape(err), 500
# Okay, no errors, so we should have a valid authorization code.
# Time to go get our server-side tokens for this user from Google.
auth_code = flask.request.args['code']
if auth_code is None:
return 'Authorization code is missing.', 400 # Bad Request
data = {
'code': auth_code,
'client_id': Config.get('oauth', 'client-id'),
'client_secret': Config.get('oauth', 'client-secret'),
'redirect_uri': full_url_for('oauth2'),
'grant_type': 'authorization_code',
}
try:
response = session.post(OAUTH2_BASE + '/token',
data,
timeout=GOOGLE_API_TIMEOUT)
except requests.exceptions.Timeout:
app.logger.error('OAuth2 token request timed out.')
# TODO: handle this better (flash message?)
message = 'Whoops, Google took too long to respond. Please try again later.'
return message, 504 # Gateway Timeout
if response.status_code != 200:
app.logger.error(
'OAuth2 token request got HTTP response %s for code "%s".',
response.status_code, auth_code)
# TODO: handle this better (flash message?)
message = (
'Whoops, we failed to finish processing your authorization with Google.'
' Please try again later.')
return message, 401 # Unauthorized
try:
result = response.json()
except ValueError:
app.logger.error(
'OAuth2 token request got non-JSON response for code "%s".',
auth_code)
# TODO: handle this better (flash message?)
message = (
'Whoops, we got an invalid response from Google for your authorization.'
' Please try again later.')
return message, 502 # Bad Gateway
# Sanity check: we always expect Bearer tokens.
if result.get('token_type') != 'Bearer':
app.logger.error(
'OAuth2 token request got unknown token type "%s" for code "%s".',
result['token_type'], auth_code)
# TODO: handle this better (flash message?)
message = (
'Whoops, we got an invalid response from Google for your authorization.'
' Please try again later.')
return message, 502 # Bad Gateway
# All non-error responses should have an access token.
access_token = result['access_token']
refresh_token = result.get('refresh_token')
# This is in seconds, but we convert it to an absolute timestamp so that we can
# account for the potential delay it takes to look up the G+ id we should associate
# the access tokens with. (Could be up to GOOGLE_API_TIMEOUT seconds later.)
expiry = datetime.datetime.today() + datetime.timedelta(
seconds=result['expires_in'])
try:
person = get_person_by_access_token(access_token)
except UnavailableException as e:
app.logger.error('Unable to finish OAuth2 flow: %r.' % e)
message = (
'Whoops, we got an invalid response from Google for your authorization.'
' Please try again later.')
return message, 502 # Bad Gateway
if refresh_token is not None:
TokenIdMapping.update_refresh_token(person['id'], refresh_token)
# Convert the absolute expiry timestamp back into a duration in seconds
expires_in = int((expiry - datetime.datetime.today()).total_seconds())
Cache.set(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % person['id'],
access_token,
time=expires_in)
# Whew, all done! Set a cookie with the user's G+ id and send them back to the homepage.
app.logger.info("Successfully authenticated G+ id %s.", person['id'])
response = flask.make_response(flask.redirect(flask.url_for('main')))
response.set_cookie('gplus_id', person['id'])
return response
def oauth2():
"""Google redirects the user back to this endpoint to continue the OAuth2 flow."""
# Check for errors from the OAuth2 process
err = flask.request.args.get('error')
if err == 'access_denied':
return flask.redirect(flask.url_for('denied'))
elif err is not None:
app.logger.warning("OAuth2 callback received error: %s", err)
# TODO: handle this better (flash message?)
message = 'Whoops, something went wrong (error=%s). Please try again later.'
return message % flask.escape(err), 500
# Okay, no errors, so we should have a valid authorization code.
# Time to go get our server-side tokens for this user from Google.
auth_code = flask.request.args['code']
if auth_code is None:
return 'Authorization code is missing.', 400 # Bad Request
data = {
'code': auth_code,
'client_id': Config.get('oauth', 'client-id'),
'client_secret': Config.get('oauth', 'client-secret'),
'redirect_uri': full_url_for('oauth2'),
'grant_type': 'authorization_code',
}
try:
response = session.post(OAUTH2_BASE + '/token', data, timeout=GOOGLE_API_TIMEOUT)
except requests.exceptions.Timeout:
app.logger.error('OAuth2 token request timed out.')
# TODO: handle this better (flash message?)
message = 'Whoops, Google took too long to respond. Please try again later.'
return message, 504 # Gateway Timeout
if response.status_code != 200:
app.logger.error('OAuth2 token request got HTTP response %s for code "%s".',
response.status_code, auth_code)
# TODO: handle this better (flash message?)
message = ('Whoops, we failed to finish processing your authorization with Google.'
' Please try again later.')
return message, 401 # Unauthorized
try:
result = response.json()
except ValueError:
app.logger.error('OAuth2 token request got non-JSON response for code "%s".', auth_code)
# TODO: handle this better (flash message?)
message = ('Whoops, we got an invalid response from Google for your authorization.'
' Please try again later.')
return message, 502 # Bad Gateway
# Sanity check: we always expect Bearer tokens.
if result.get('token_type') != 'Bearer':
app.logger.error('OAuth2 token request got unknown token type "%s" for code "%s".',
result['token_type'], auth_code)
# TODO: handle this better (flash message?)
message = ('Whoops, we got an invalid response from Google for your authorization.'
' Please try again later.')
return message, 502 # Bad Gateway
# All non-error responses should have an access token.
access_token = result['access_token']
refresh_token = result.get('refresh_token')
# This is in seconds, but we convert it to an absolute timestamp so that we can
# account for the potential delay it takes to look up the G+ id we should associate
# the access tokens with. (Could be up to GOOGLE_API_TIMEOUT seconds later.)
expiry = datetime.datetime.today() + datetime.timedelta(seconds=result['expires_in'])
try:
person = get_person_by_access_token(access_token)
except UnavailableException as e:
app.logger.error('Unable to finish OAuth2 flow: %r.' % e)
message = ('Whoops, we got an invalid response from Google for your authorization.'
' Please try again later.')
return message, 502 # Bad Gateway
if refresh_token is not None:
TokenIdMapping.update_refresh_token(person['id'], refresh_token)
# Convert the absolute expiry timestamp back into a duration in seconds
expires_in = int((expiry - datetime.datetime.today()).total_seconds())
Cache.set(ACCESS_TOKEN_CACHE_KEY_TEMPLATE % person['id'], access_token, time=expires_in)
# Whew, all done! Set a cookie with the user's G+ id and send them back to the homepage.
app.logger.info("Successfully authenticated G+ id %s.", person['id'])
response = flask.make_response(flask.redirect(flask.url_for('main')))
response.set_cookie('gplus_id', person['id'])
return response
