author | David Anderson <david.jc.anderson@gmail.com> |
Fri, 13 Mar 2009 18:14:44 +0000 | |
changeset 1833 | 9df2e9a67081 |
parent 1278 | a7766286a7be |
child 3031 | 7678f72140e6 |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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"""Convience functions for the Webapp framework.""" |
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__all__ = ["login_required", "run_wsgi_app"] |
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import os |
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import sys |
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import wsgiref.util |
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from google.appengine.api import users |
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from google.appengine.ext import webapp |
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def login_required(handler_method): |
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"""A decorator to require that a user be logged in to access a handler. |
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To use it, decorate your get() method like this: |
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@login_required |
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def get(self): |
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user = users.get_current_user(self) |
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self.response.out.write('Hello, ' + user.nickname()) |
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We will redirect to a login page if the user is not logged in. We always |
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redirect to the request URI, and Google Accounts only redirects back as a GET |
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request, so this should not be used for POSTs. |
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""" |
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def check_login(self, *args): |
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if self.request.method != 'GET': |
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raise webapp.Error('The check_login decorator can only be used for GET ' |
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'requests') |
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user = users.get_current_user() |
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if not user: |
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self.redirect(users.create_login_url(self.request.uri)) |
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return |
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else: |
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handler_method(self, *args) |
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return check_login |
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def run_wsgi_app(application): |
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"""Runs your WSGI-compliant application object in a CGI environment. |
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Compared to wsgiref.handlers.CGIHandler().run(application), this |
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function takes some shortcuts. Those are possible because the |
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app server makes stronger promises than the CGI standard. |
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""" |
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env = dict(os.environ) |
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env["wsgi.input"] = sys.stdin |
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env["wsgi.errors"] = sys.stderr |
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env["wsgi.version"] = (1, 0) |
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env["wsgi.run_once"] = True |
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env["wsgi.url_scheme"] = wsgiref.util.guess_scheme(env) |
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env["wsgi.multithread"] = False |
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env["wsgi.multiprocess"] = False |
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result = application(env, _start_response) |
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if result is not None: |
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for data in result: |
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sys.stdout.write(data) |
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def _start_response(status, headers, exc_info=None): |
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"""A start_response() callable as specified by PEP 333""" |
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if exc_info is not None: |
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raise exc_info[0], exc_info[1], exc_info[2] |
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print "Status: %s" % status |
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for name, val in headers: |
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print "%s: %s" % (name, val) |
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return sys.stdout.write |