isso.dispatch now dispatches multiple sites based on relative URLs

The previous approach using a custom X-Custom header did work for the
client-side, but not for activation and deletion links. Now, you need
to add a `name = foo` option to the general section. `isso.dispatch`
then binds this configuration to /foo and can distinguish all API
calls without a special HTTP header.

docs/docs/configuration/server.rst

@@ -38,6 +38,7 @@ session key and hostname. Here are the default values for this section:
 
     [general]
     dbpath = /tmp/isso.db
+    name =
     host = http://localhost:8080/
     max-age = 15m
     session-key = ... ; python: binascii.b2a_hex(os.urandom(24))
@@ -47,6 +48,10 @@ dbpath
     file location to the SQLite3 database, highly recommended to change this
     location to a non-temporary location!
 
+name
+    required to dispatch :ref:`multiple websites <configure-multiple-sites>`,
+    not used otherwise.
+
 host
     URL to your website. When you start Isso, it will probe your website with
     a simple ``GET /`` request to see if it can reach the webserver. If this

docs/docs/configuration/setup.rst

@@ -42,25 +42,28 @@ websites on different domains.
 
 The following example uses `gunicorn <http://gunicorn.org/>`_ as WSGI server (
 you can use uWSGI as well). Let's say you maintain two websites, like
-foo.example and other.foo:
+foo.example and other.bar:
 
 .. code-block:: sh
 
     $ cat /etc/isso.d/foo.example.cfg
     [general]
+    name = foo
     host = http://foo.example/
     dbpath = /var/lib/isso/foo.example.db
 
-    $ cat /etc/isso.d/other.foo.cfg
+    $ cat /etc/isso.d/other.bar.cfg
     [general]
-    host = http://other.foo/
-    dbpath = /var/lib/isso/other.foo.db
+    name = bar
+    host = http://other.bar/
+    dbpath = /var/lib/isso/other.bar.db
 
-Then you run Isso using gunicorn:
+Then you run Isso with gunicorn (separate multiple configuration files by
+semicolon):
 
 .. code-block:: sh
 
-    $ export ISSO_SETTINGS="/etc/isso.d/foo.example.cfg;/etc/isso.d/other.foo.cfg"
+    $ export ISSO_SETTINGS="/etc/isso.d/foo.example.cfg;/etc/isso.d/other.bar.cfg"
     $ gunicorn isso.dispatch -b localhost:8080
 
 In your webserver configuration, proxy Isso as usual:
@@ -73,18 +76,18 @@ In your webserver configuration, proxy Isso as usual:
 
           location / {
               proxy_pass http://localhost:8080;
-              proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-              proxy_set_header X-Real-IP $remote_addr;
           }
       }
 
-To verify the setup, run:
+When you now visit http://comments.example/, you will see your different Isso
+configuration separated by /`name`.
 
-.. code-block:: sh
+.. code-block:: text
 
-      $ curl -vH "Origin: http://foo.example" http://comments.example/
-      ...
-      $ curl -vH "Origin: http://other.foo" http://comments.example/
-      ...
+    $ curl http://comments.example/
+    /foo
+    /bar
 
-In case of a 418 (I'm a teapot), the setup is *not* correctly configured.
+Just embed the JavaScript including the new relative path, e.g.
+*http://comments.example/foo/js/embed.min.js*. Make sure, you don't mix the
+URLs on both sites as it will most likely cause CORS-related errors.

docs/example.conf

@@ -7,6 +7,9 @@
 # location to a non-temporary location
 dbpath = /tmp/comments.db
 
+# required to dispatch multiple websites, not used otherwise.
+name =
+
 # URL to your website. When you start Isso, it will probe your website with a
 # simple GET / request to see if it can reach the webserver. If this fails, Isso
 # may not be able check if a web page exists, thus fails to accept new comments.

isso/core.py

@@ -105,6 +105,7 @@ class Config:
 
     default = [
         "[general]",
+        "name = ",
         "dbpath = /tmp/isso.db", "session-key = %r" % binascii.b2a_hex(os.urandom(24)),
         "host = http://localhost:8080/", "max-age = 15m",
         "notify = ",

isso/dispatch.py

@@ -1,3 +1,4 @@
+# -*- encoding: utf-8 -*-
 
 import os
 import logging
@@ -7,8 +8,8 @@ try:
 except ImportError:
     from urllib.parse import urlparse
 
-from werkzeug.wrappers import Request
-from werkzeug.exceptions import ImATeapot
+from werkzeug.wsgi import DispatcherMiddleware
+from werkzeug.wrappers import Response
 
 from isso import make_app, wsgi
 from isso.core import Config
@@ -16,40 +17,36 @@ from isso.core import Config
 logger = logging.getLogger("isso")
 
 
-class Dispatcher(object):
+class Dispatcher(DispatcherMiddleware):
     """
     A dispatcher to support different websites. Dispatches based on
-    HTTP-Host. If HTTP-Host is not provided, display an error message.
+    a relative URI, e.g. /foo.example and /other.bar.
     """
 
     def __init__(self, *confs):
 
         self.isso = {}
 
-        for conf in map(Config.load, confs):
+        for i, conf in enumerate(map(Config.load, confs)):
 
-            app = make_app(conf)
+            if not conf.get("general", "name"):
+                logger.warn("unable to dispatch %r, no 'name' set", confs[i])
+                continue
 
-            for origin in conf.getiter("general", "host"):
-                self.isso[origin.rstrip("/")] = app
+            self.isso["/" + conf.get("general", "name")] = make_app(conf)
 
-    def __call__(self, environ, start_response):
+        super(Dispatcher, self).__init__(self.default, mounts=self.isso)
 
-        if Request(environ).url.endswith((".js", ".css")):
-            return self.isso.values()[0](environ, start_response)
+    def __call__(self, environ, start_response):
 
-        if "HTTP_X_ORIGIN" in environ and "HTTP_ORIGIN" not in environ:
-            environ["HTTP_ORIGIN"] = environ["HTTP_X_ORIGIN"]
+        # clear X-Script-Name as the PATH_INFO is already adjusted
+        environ.pop('HTTP_X_SCRIPT_NAME', None)
 
-        origin = environ.get("HTTP_ORIGIN", wsgi.host(environ))
+        return super(Dispatcher, self).__call__(environ, start_response)
 
-        try:
-            # logger.info("dispatch %s", origin)
-            return self.isso[origin](environ, start_response)
-        except KeyError:
-            # logger.info("unable to dispatch %s", origin)
-            resp = ImATeapot("unable to dispatch %s" % origin)
-            return resp(environ, start_response)
+    def default(self, environ, start_response):
+        resp = Response("\n".join(self.isso.keys()), 404, content_type="text/plain")
+        return resp(environ, start_response)
 
 
 if "ISSO_SETTINGS" not in os.environ:
@@ -61,4 +58,4 @@ else:
             logger.fatal("%s: no such file", path)
             break
     else:
-        application = Dispatcher(*confs)
+        application = wsgi.SubURI(Dispatcher(*confs))

isso/js/app/api.js

@@ -87,10 +87,6 @@ define(["q"], function(Q) {
             xhr.withCredentials = true;
             xhr.setRequestHeader("Content-Type", "application/json");
 
-            if (method === "GET") {
-                xhr.setRequestHeader("X-Origin", window.location.origin);
-            }
-
             xhr.onreadystatechange = function () {
                 if (xhr.readyState === 4) {
                     onload();

isso/wsgi.py

@@ -69,7 +69,7 @@ class CORSMiddleware(object):
         def add_cors_headers(status, headers, exc_info=None):
             headers = Headers(headers)
             headers.add("Access-Control-Allow-Origin", self.origin(environ))
-            headers.add("Access-Control-Allow-Headers", "Origin, Content-Type, X-Origin")
+            headers.add("Access-Control-Allow-Headers", "Origin, Content-Type")
             headers.add("Access-Control-Allow-Credentials", "true")
             headers.add("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE")
             headers.add("Access-Control-Expose-Headers", "X-Set-Cookie")

specs/test_cors.py

@@ -26,7 +26,7 @@ def test_simple_CORS():
     rv = client.get("/", headers={"ORIGIN": "https://example.tld"})
 
     assert rv.headers["Access-Control-Allow-Origin"] == "https://example.tld"
-    assert rv.headers["Access-Control-Allow-Headers"] == "Origin, Content-Type, X-Origin"
+    assert rv.headers["Access-Control-Allow-Headers"] == "Origin, Content-Type"
     assert rv.headers["Access-Control-Allow-Credentials"] == "true"
     assert rv.headers["Access-Control-Allow-Methods"] == "GET, POST, PUT, DELETE"
     assert rv.headers["Access-Control-Expose-Headers"] == "X-Set-Cookie"