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Søren Løvborg

auth: add AuthUser.is_anonymous, along with some exposition

This reveals the name of the NotAnonymous decorator to be misleading,
an unfortunate detail only documented here, but which must be properly
resolved in a later changeset.

Note that NotAnonymous behaves as advertised as long as it is used
together with LoginRequired, which is always the case in the current
code, so there's no actual security issue here, the code is just weird,
hard to read and fragile.

---

Some thoughts on cleaning this up in a future changeset: As it turns
out, every controller (except the login page!) should be LoginRequired
decorated (since it doesn't actually block anonymous users, as long as
anonymous access is enabled in the Kallithea config). Thus the most
obvious solution would be to move the LoginRequired functionality into
BaseController (with an override for LoginController), and delete the
decorator entirely. However, LoginRequired does one other thing: it
carries information about whether API access is enabled for individual
controller methods ("@LoginRequired(api_key=True)"), and also performs
the check for this, something which is not easily moved into the base
controller class, since the base controller doesn't know which method is
about to be called. Possibly that can be determined by poking Pylons,
but such code is likely to break with the upcoming TurboGears 2 move.
Thus such cleanup is probably better revisited after the switch to TG2.

.. _email:

==============
Email settings
==============

The Kallithea configuration file has several email related settings. When
these contain correct values, Kallithea will send email in the situations
described below. If the email configuration is not correct so that emails
cannot be sent, all mails will show up in the log output.

Before any email can be sent, an SMTP server has to be configured using the
configuration file setting ``smtp_server``. If required for that server, specify
a username (``smtp_username``) and password (``smtp_password``), a non-standard
port (``smtp_port``), whether to use "SSL" when connecting (``smtp_use_ssl``)
or use STARTTLS (``smtp_use_tls``), and/or specify special ESMTP "auth" features
(``smtp_auth``).

For example, for sending through gmail, use::

    smtp_server = smtp.gmail.com
    smtp_username = username
    smtp_password = password
    smtp_port = 465
    smtp_use_ssl = true


Application emails
------------------

Kallithea sends an email to `users` on several occasions:

- when comments are given on one of their changesets
- when comments are given on changesets they are reviewer on or on which they
  commented regardless
- when they are invited as reviewer in pull requests
- when they request a password reset

Kallithea sends an email to all `administrators` upon new account registration.
Administrators are users with the ``Admin`` flag set on the *Admin > Users*
page.

When Kallithea wants to send an email but due to an error cannot correctly
determine the intended recipients, the administrators and the addresses
specified in ``email_to`` in the configuration file are used as fallback.

Recipients will see these emails originating from the sender specified in the
``app_email_from`` setting in the configuration file. This setting can either
contain only an email address, like `kallithea-noreply@example.com`, or both
a name and an address in the following format: `Kallithea
<kallithea-noreply@example.com>`. However, if the email is sent due to an
action of a particular user, for example when a comment is given or a pull
request created, the name of that user will be combined with the email address
specified in ``app_email_from`` to form the sender (and any name part in that
configuration setting disregarded).

The subject of these emails can optionally be prefixed with the value of
``email_prefix`` in the configuration file.

A Kallithea-specific header indicating the email type will be added to each
email. This header can be used for email filtering. The header is of the form:

    X-Kallithea-Notification-Type: <type>

where ``<type>`` is one of:

- ``pull_request``: you are invited as reviewer in a pull request
- ``pull_request_comment``: a comment was given on a pull request
- ``cs_comment``: a comment was given on a changeset
- ``registration``: a new user was registered
- ``message``: another type of email


Error emails
------------

When an exception occurs in Kallithea -- and unless interactive debugging is
enabled using ``set debug = true`` in the ``[app:main]`` section of the
configuration file -- an email with exception details is sent by WebError_'s
``ErrorMiddleware`` to the addresses specified in ``email_to`` in the
configuration file.

Recipients will see these emails originating from the sender specified in the
``error_email_from`` setting in the configuration file. This setting can either
contain only an email address, like `kallithea-noreply@example.com`, or both
a name and an address in the following format: `Kallithea Errors
<kallithea-noreply@example.com>`.

*Note:* The WebError_ package does not respect ``smtp_port`` and assumes the
standard SMTP port (25). If you have a remote SMTP server with a different port,
you could set up a local forwarding SMTP server on port 25.


References
----------

- `Error Middleware (Pylons documentation) <http://pylons-webframework.readthedocs.org/en/latest/debugging.html#error-middleware>`_
- `ErrorHandler (Pylons modules documentation) <http://pylons-webframework.readthedocs.org/en/latest/modules/middleware.html#pylons.middleware.ErrorHandler>`_


.. _WebError: https://pypi.python.org/pypi/WebError