Made an URL prefix configurable in settings, includes tests.

README.rst

@@ -48,7 +48,12 @@ To deploy it, I'm using gunicorn and supervisord::
 Don't forget to set the right permission for your files !
 
 Also, create a `settings.py` file with the appropriate values if you need to
-use a different database for instance.
+use a different database for instance. You can also set `APPLICATION_ROOT` if
+you want to prefix your URLs to serve ihatemonney in the *folder* of a domain,
+e.g:
+
+    APPLICATION_ROOT='/budget'
+
 
 How about the REST API?
 =======================

budget/default_settings.py

@@ -4,6 +4,7 @@ SQLACHEMY_ECHO = DEBUG
 SECRET_KEY = "tralala"
 
 MAIL_DEFAULT_SENDER = ("Budget manager", "budget@notmyidea.org")
+APPLICATION_ROOT = '/'
 
 try:
     from settings import *

budget/run.py

@@ -6,7 +6,7 @@ from raven.contrib.flask import Sentry
 
 from web import main, db, mail
 from api import api
-
+from utils import PrefixedWSGI
 
 app = Flask(__name__)
 
@@ -15,6 +15,7 @@ def configure():
     """ A way to (re)configure the app, specially reset the settings
     """
     app.config.from_object("default_settings")
+    app.wsgi_app = PrefixedWSGI(app)
 
     # Deprecations
     if 'DEFAULT_MAIL_SENDER' in app.config:

budget/tests.py

@@ -821,5 +821,20 @@ class APITestCase(TestCase):
         self.assertStatus(404, req)
 
 
+class ServerTestCase(APITestCase):
+    def setUp(self):
+        run.configure()
+        super(ServerTestCase, self).setUp()
+
+    def test_unprefixed(self):
+        req = self.app.get("/foo/")
+        self.assertStatus(303, req)
+
+    def test_prefixed(self):
+        run.app.config['APPLICATION_ROOT'] = '/foo'
+        req = self.app.get("/foo/")
+        self.assertStatus(200, req)
+
+
 if __name__ == "__main__":
     unittest.main()

budget/utils.py

@@ -32,3 +32,34 @@ class Redirect303(HTTPException, RoutingException):
 
     def get_response(self, environ):
         return redirect(self.new_url, 303)
+
+
+class PrefixedWSGI(object):
+    '''
+    Wrap the application in this middleware and configure the
+    front-end server to add these headers, to let you quietly bind
+    this to a URL other than / and to an HTTP scheme that is
+    different than what is used locally.
+
+    It relies on "APPLICATION_ROOT" app setting.
+
+    Inspired from http://flask.pocoo.org/snippets/35/
+
+    :param app: the WSGI application
+    '''
+    def __init__(self, app):
+        self.app = app
+        self.wsgi_app = app.wsgi_app
+
+    def __call__(self, environ, start_response):
+        script_name = self.app.config['APPLICATION_ROOT']
+        if script_name:
+            environ['SCRIPT_NAME'] = script_name
+            path_info = environ['PATH_INFO']
+            if path_info.startswith(script_name):
+                environ['PATH_INFO'] = path_info[len(script_name):]
+
+        scheme = environ.get('HTTP_X_SCHEME', '')
+        if scheme:
+            environ['wsgi.url_scheme'] = scheme
+        return self.wsgi_app(environ, start_response)