Factor out sidebar entry construction
This makes it possible to reuse this logic in other modules as well,
preventing code duplication. While at it, move additional_sidebar
merging before the other entries (additional entries should go first,
since the other entries are mostly dev-only etc).
Patch by: Sverre Rabbelier
Differences Between WebOb and Other Systems+++++++++++++++++++++++++++++++++++++++++++This document points out some of the API differences between theRequest and Response object, and the objects in other systems... contents::paste.wsgiwrappers and Pylons=============================The Pylons ``request`` and ``response`` object are based on``paste.wsgiwrappers.WSGIRequest`` and ``WSGIResponse``There is no concept of ``defaults`` in WebOb. In Paste/Pylons theseserve as threadlocal settings that control certain policies on therequest and response object. In WebOb you should make your ownsubclasses to control policy (though in many ways simply beingexplicit elsewhere removes the need for this policy).Request-------``body``: This is a file-like object in WSGIRequest. In WebOb it is a string (to match Response.body) and the file-like object is available through ``req.body_file````languages()``: This is available through ``req.accept_language``, particularly ``req.accept_language.best_matches(fallback_language)````match_accept(mimetypes)``: This is available through ``req.accept.first_match(mimetypes)``; or if you trust the client's quality ratings, you can use ``req.accept.best_match(mimetypes)````errors``: This controls how unicode decode errors are handled; it is now named ``unicode_errors``There are also many extra methods and attributes on WebOb Requestobjects.Response--------default ``content_type``: The base Response object has no default content_type or charset. You can set ``default_content_type`` in a subclass.``determine_charset()``: Is now available as ``res.charset````has_header(header)``: Should be done with ``header in res.headers````get_content()`` and ``wsgi_response()``: These are gone; you should use ``res.body`` or ``res(environ, start_response)````write(content)``: Available in ``res.body_file.write(content)``.``flush()`` and ``tell()``: Not available.There are also many extra methods and attributes on WebOb Responseobjects.Django======This is a quick summary from reading `the Django documentation<http://www.djangoproject.com/documentation/request_response/>`_.Request-------``encoding``: Is ``req.charset````REQUEST``: Is ``req.params````FILES``: File uploads are ``cgi.FieldStorage`` objects directly in ``res.POST````META``: Is ``req.environ````user``: No equivalent (too connected to application model for WebOb). There is ``req.remote_user``, which is only ever a string.``session``: No equivalent``raw_post_data``: Available with ``req.body````__getitem__(key)``: You have to use ``req.params````is_secure()``: No equivalent; you could use ``req.scheme == 'https'``.QueryDict---------QueryDict is the way Django represents the multi-key dictionary-likeobjects that are request variables (query string and POST bodyvariables). The equivalent in WebOb is MultiDict.Mutability: WebOb dictionaries are sometimes mutable (req.GET is, req.params is not)Ordering: I believe Django does not order the keys fully; MultiDict is a full ordering. Methods that iterate over the parameters iterate over keys in their order in the original request.``keys()``, ``items()``, ``values()`` (plus ``iter*``): These return all values in MultiDict, but only the last value for a QueryDict. That is, given ``a=1&a=2`` with MultiDict ``d.items()`` returns ``[('a', '1'), ('a', '2')]``, but QueryDict returns ``[('a', '1')]````getlist(key)``: Available as ``d.getall(key)````setlist(key)``: No direct equivalent``appendlist(key, value)``: Available as ``d.add(key, value)````setlistdefault(key, default_list)``: No direct equivalent``lists()``: Is ``d.dict_of_lists()``The MultiDict object has a ``d.getone(key)`` method, that raisesKeyError if there is not exactly one key. There is a method``d.mixed()`` which returns a version where values are lists *if*there are multiple values for a list. This is similar to how manycgi-based request forms are represented.Response--------Constructor: Totally different. The WebOb Response object should probably be subclassed for direct application use; in WebOb it does not *prefer* HTML or anything normal web application conventionsdictionary-like: The Django response object is somewhat dictionary-like, setting headers. The equivalent dictionary-like object is ``res.headers``. In WebOb this is a MultiDict.``has_header(header)``: Use ``header in res.headers````write(content)``: As ``res.body_file.write(content)````flush()``, ``tell()``: Not available``content``: Use ``res.body`` for the ``str`` value, ``res.unicode_body`` for the ``unicode`` valueResponse Subclasses-------------------These are generally like ``webob.exc`` objects.``HttpResponseNotModified`` is ``HTTPNotModified``; this namingtranslation generally works.CherryPy/TurboGears===================The `CherryPy request object<http://www.cherrypy.org/wiki/RequestObject>`_ is also used byTurboGears 1.x.Request-------``app``: No equivalent``base``: ``req.application_url````close()``: No equivalent``closed``: No equivalent``config``: No equivalent``cookie``: A ``SimpleCookie`` object in CherryPy; a dictionary in WebOb (``SimpleCookie`` can represent cookie parameters, but cookie parameters are only sent with responses not requests)``dispatch``: No equivalent (this is the object dispatcher in CherryPy).``error_page``, ``error_response``, ``handle_error``: No equivalent``get_resource()``: Similar to ``req.get_response(app)````handler``: No equivalent``headers``, ``header_list``: The WSGI environment represents headers as a dictionary, available through ``req.headers`` (no list form is available in the request).``hooks``: No equivalent``local``: No equivalent``methods_with_bodies``: This represents methods where CherryPy will automatically try to read the request body. WebOb lazily reads POST requests with the correct content type, and no other bodies.``namespaces``: No equivalent``protocol``: As ``req.environ['SERVER_PROTOCOL']````query_string``: As ``req.query_string````remote``: ``remote.ip`` is like ``req.remote_addr``. ``remote.port`` is not available. ``remote.name`` is in ``req.environ.get('REMOTE_HOST')````request_line``: No equivalent``respond()``: A method that is somewhat similar to ``req.get_response()``.``rfile``: ``req.body_file````run``: No equivalent``server_protocol``: As ``req.environ['SERVER_PROTOCOL']````show_tracebacks``: No equivalent``throw_errors``: No equivalent``throws``: No equivalent``toolmaps``: No equivalent``wsgi_environ``: As ``req.environ``Response--------From information `from the wiki<http://www.cherrypy.org/wiki/ResponseObject>`_.``body``: This is an iterable in CherryPy, a string in WebOb; ``res.app_iter`` gives an iterable in WebOb.``check_timeout``: No equivalent``collapse_body()``: This turns a stream/iterator body into a single string. Accessing ``res.body`` will do this automatically.``cookie``: Accessible through ``res.set_cookie(...)``, ``res.delete_cookie``, ``res.unset_cookie()````finalize()``: No equivalent``header_list``: In ``res.headerlist````stream``: This can make CherryPy stream the response body out directory. There is direct no equivalent; you can use a dynamically generated iterator to do something similar.``time``: No equivalent``timed_out``: No equivalentYaro====`Yaro <http://lukearno.com/projects/yaro/>`_ is a small wrapper aroundthe WSGI environment, much like WebOb in scope.The WebOb objects have many more methods and attributes. The YaroResponse object is a much smaller subset of WebOb's Response.Request-------``query``: As ``req.GET````form``: As ``req.POST````cookie``: A ``SimpleCookie`` object in Yaro; a dictionary in WebOb (``SimpleCookie`` can represent cookie parameters, but cookie parameters are only sent with responses not requests)``uri``: Returns a URI object, no equivalent (only string URIs available).``redirect``: Not available (response-related). ``webob.exc.HTTPFound()`` can be useful here.``forward(yaroapp)``, ``wsgi_forward(wsgiapp)``: Available with ``req.get_response(app)`` and ``req.call_application(app)``. In both cases it is a WSGI application in WebOb, there is no special kind of communication; ``req.call_application()`` just returns a ``webob.Response`` object.``res``: The request object in WebOb *may* have a ``req.response`` attribute.Werkzeug========Probably not that many people know about this library, which is aoffshoot of `Pocoo <http://pocoo.org>`_, and used to go by anothername (Columbrid?) This library is based around WSGI, similar to Pasteand Yaro.This is take from the `wrapper documentation<http://werkzeug.pocoo.org/documentation/wrappers>`_.Request-------path: As ``req.path_info``args: As ``req.GET``form: As ``req.POST``values: As ``req.params``files: In ``req.POST`` (as FieldStorage objects)data: In ``req.body_file``Response--------response: In ``res.body`` (settable as ``res.body`` or ``res.app_iter``)status: In ``res.status_int``mimetype: In ``res.content_type``write(data): With ``res.body_file.write(data)``Zope 3======From the Zope 3 interfaces for the `Request<http://apidoc.zope.org/++apidoc++/Interface/zope.publisher.interfaces.browser.IBrowserRequest/index.html>`_and `Response<http://apidoc.zope.org/++apidoc++/Interface/zope.publisher.interfaces.http.IHTTPResponse/index.html>`_.Request-------``locale``, ``setupLocale()``: This is not fully calculated, but information is available in ``req.accept_languages``.``principal``, ``setPrincipal(principal)``: ``req.remote_user`` gives the username, but there is no standard place for a user *object*.``publication``, ``setPublication()``, These are associated with the object publishing system in Zope. This kind of publishing system is outside the scope of WebOb.``traverse(object)``, ``getTraversalStack()``, ``setTraversalStack()``: These all relate to traversal, which is part of the publishing system.``processInputs()``, ``setPathSuffix(steps)``: Also associated with traversal and preparing the request.``environment``: In ``req.environ````bodyStream``: In ``req.body_file````interaction``: This is the security context for the request; all the possible participants or principals in the request. There's no equivalent.``annotations``: Extra information associated with the request. This would generally go in custom keys of ``req.environ``, or if you set attributes those attributes are stored in ``req.environ['webob.adhoc_attrs']``.``debug``: There is no standard debug flag for WebOb.``__getitem__(key)``, ``get(key)``, etc: These treat the request like a dictionary, which WebOb does not do. They seem to take values from the environment, not parameters. Also on the Zope request object is ``items()``, ``__contains__(key)``, ``__iter__()``, ``keys()``, ``__len__()``, ``values()``.``getPositionalArguments()``: I'm not sure what the equivalent would be, as there are no positional arguments during instantiation (it doesn't fit into WSGI). Maybe ``wsgiorg.urlvars``?``retry()``, ``supportsRetry()``: Creates a new request that can be used to retry a request. Similar to ``req.copy()``.``close()``, ``hold(obj)``: This closes resources associated with the request, including any "held" objects. There's nothing similar.Response--------``authUser``: Not sure what this is or does.``reset()``: No direct equivalent; you'd have to do ``res.headers = []; res.body = ''; res.status = 200````setCookie(name, value, **kw)``: Is ``res.set_cookie(...)``.``getCookie(name)``: No equivalent. Hm.``expireCookie(name)``: Is ``res.delete_cookie(name)``.``appendToCookie(name, value)``: This appends the value to any existing cookie (separating values with a colon). WebOb does not do this.``setStatus(status)``: Availble by setting ``res.status`` (can be set to an integer or a string of "code reason").``getHeader(name, default=None)``: Is ``res.headers.get(name)``.``getStatus()``: Is ``res.status_int`` (or ``res.status`` to include reason)``addHeader(name, value)``: Is ``res.headers.add(name, value)`` (in Zope and WebOb, this does not clobber any previous value).``getHeaders()``: Is ``res.headerlist``.``setHeader(name, value)``: Is ``res.headers[name] = value``.``getStatusString()``: Is ``res.status``.``consumeBody()``: This consumes any non-string body to turn the body into a single string. Any access to ``res.body`` will do this (e.g., when you have set the ``res.app_iter``).``internalError()``: This is available with ``webob.exc.HTTP*()``.``handleException(exc_info)``: This is provided with a tool like ``paste.exceptions``.``consumeBodyIter()``: This returns the iterable for the body, even if the body was a string. Anytime you access ``res.app_iter`` you will get an iterable. ``res.body`` and ``res.app_iter`` can be interchanged and accessed as many times as you want, unlike the Zope equivalents.``setResult(result)``: You can achieve the same thing through ``res.body = result``, or ``res.app_iter = result``. ``res.body`` accepts None, a unicode string (*if* you have set a charset) or a normal string. ``res.app_iter`` only accepts None and an interable. You can't update all of a response with one call. Like in Zope, WebOb updates Content-Length. Unlike Zope, it does not automatically calculate a charset.mod_python==========Some key attributes from the `mod_python<http://modpython.org/live/current/doc-html/pyapi-mprequest-mem.html>`_ request object.Request-------``req.uri``: In ``req.path``.``req.user``: In ``req.remote_user``.``req.get_remote_host()``: In ``req.environ['REMOTE_ADDR']`` or ``req.remote_addr``.``req.headers_in.get('referer')``: In ``req.headers.get('referer')`` or ``req.referer`` (same pattern for other request headers, presumably).Response--------``util.redirect`` or ``req.status = apache.HTTP_MOVED_TEMPORARILY``:.. code-block:: from webob.exc import HTTPMovedTemporarily() exc = HTTPMovedTemporarily(location=url) return exc(environ, start_response)``req.content_type = "application/x-csv"`` and ``req.headers_out.add('Content-Disposition', 'attachment;filename=somefile.csv'):.. code-block:: res = req.ResponseClass() res.content_type = 'application/x-csv' res.headers.add('Content-Disposition', 'attachment;filename=somefile.csv') return res(environ, start_response)