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Introduction
============

Matrix is an ambitious new ecosystem for open federated Instant Messaging and
VoIP.  The basics you need to know to get up and running are:

- Everything in Matrix happens in a room.  Rooms are distributed and do not
  exist on any single server.  Rooms can be located using convenience aliases 
  like ``#matrix:matrix.org`` or ``#test:localhost:8008``.

- Matrix user IDs look like ``@matthew:matrix.org`` (although in the future
  you will normally refer to yourself and others using a 3PID: email
  address, phone number, etc rather than manipulating Matrix user IDs)

The overall architecture is::

      client <----> homeserver <=====================> homeserver <----> client
             https://somewhere.org/_matrix      https://elsewhere.net/_matrix

``#matrix:matrix.org`` is the official support room for Matrix, and can be
accessed by the web client at http://matrix.org/alpha or via an IRC bridge at
irc://irc.freenode.net/matrix.

Synapse is currently in rapid development, but as of version 0.5 we believe it 
is sufficiently stable to be run as an internet-facing service for real usage!

About Matrix
============

Matrix specifies a set of pragmatic RESTful HTTP JSON APIs as an open standard,
which handle:

- Creating and managing fully distributed chat rooms with no
  single points of control or failure
- Eventually-consistent cryptographically secure synchronisation of room
  state across a global open network of federated servers and services
- Sending and receiving extensible messages in a room with (optional)
  end-to-end encryption[1]
- Inviting, joining, leaving, kicking, banning room members
- Managing user accounts (registration, login, logout)
- Using 3rd Party IDs (3PIDs) such as email addresses, phone numbers,
  Facebook accounts to authenticate, identify and discover users on Matrix.
- Placing 1:1 VoIP and Video calls

These APIs are intended to be implemented on a wide range of servers, services
and clients, letting developers build messaging and VoIP functionality on top
of the entirely open Matrix ecosystem rather than using closed or proprietary
solutions. The hope is for Matrix to act as the building blocks for a new
generation of fully open and interoperable messaging and VoIP apps for the
internet.

Synapse is a reference "homeserver" implementation of Matrix from the core
development team at matrix.org, written in Python/Twisted for clarity and
simplicity.  It is intended to showcase the concept of Matrix and let folks see
the spec in the context of a codebase and let you run your own homeserver and
generally help bootstrap the ecosystem.

In Matrix, every user runs one or more Matrix clients, which connect through to
a Matrix homeserver which stores all their personal chat history and user
account information - much as a mail client connects through to an IMAP/SMTP
server. Just like email, you can either run your own Matrix homeserver and
control and own your own communications and history or use one hosted by
someone else (e.g. matrix.org) - there is no single point of control or
mandatory service provider in Matrix, unlike WhatsApp, Facebook, Hangouts, etc.

Synapse ships with two basic demo Matrix clients: webclient (a basic group chat
web client demo implemented in AngularJS) and cmdclient (a basic Python
command line utility which lets you easily see what the JSON APIs are up to).

Meanwhile, iOS and Android SDKs and clients are currently in development and available from:

 * https://github.com/matrix-org/matrix-ios-sdk
 * https://github.com/matrix-org/matrix-android-sdk

We'd like to invite you to join #matrix:matrix.org (via http://matrix.org/alpha), run a homeserver, take a look at the Matrix spec at
http://matrix.org/docs/spec, experiment with the APIs and the demo
clients, and report any bugs via http://matrix.org/jira.

Thanks for using Matrix!

[1] End-to-end encryption is currently in development

Homeserver Installation
=======================

System requirements:
- POSIX-compliant system (tested on Linux & OSX)
- Python 2.7

Synapse is written in python but some of the libraries is uses are written in
C. So before we can install synapse itself we need a working C compiler and the
header files for python C extensions.

Installing prerequisites on Ubuntu or Debian::

    $ sudo apt-get install build-essential python2.7-dev libffi-dev \
                           python-pip python-setuptools

Installing prerequisites on Mac OS X::

    $ xcode-select --install
    
To install the synapse homeserver run::

    $ pip install --user --process-dependency-links https://github.com/matrix-org/synapse/tarball/master

This installs synapse, along with the libraries it uses, into
``$HOME/.local/lib/`` on Linux or ``$HOME/Library/Python/2.7/lib/`` on OSX.

Troubleshooting Installation
----------------------------

Synapse requires pip 1.7 or later, so if your OS provides too old a version and 
you get errors about ``error: no such option: --process-dependency-links`` you 
may need to manually upgrade it::

    $ sudo pip install --upgrade pip
    
If pip crashes mid-installation for reason (e.g. lost terminal), pip may
refuse to run until you remove the temporary installation directory it
created. To reset the installation::

    $ rm -rf /tmp/pip_install_matrix
    
pip seems to leak *lots* of memory during installation.  For instance, a Linux 
host with 512MB of RAM may run out of memory whilst installing Twisted.  If this 
happens, you will have to individually install the dependencies which are 
failing, e.g.:

    $ pip install --user twisted

Running Your Homeserver
=======================

To actually run your new homeserver, pick a working directory for Synapse to run 
(e.g. ``~/.synapse``), and::

    $ mkdir ~/.synapse
    $ cd ~/.synapse
    
    $ # on Linux
    $ ~/.local/bin/synctl start
    
    $ # on OSX
    $ ~/Library/Python/2.7/bin/synctl start

Troubleshooting Running
-----------------------

If ``synctl`` fails with ``pkg_resources.DistributionNotFound`` errors you may 
need a newer version of setuptools than that provided by your OS.

    $ sudo pip install setuptools --upgrade

If synapse fails with ``missing "sodium.h"`` crypto errors, you may need 
to manually upgrade PyNaCL, as synapse uses NaCl (http://nacl.cr.yp.to/) for 
encryption and digital signatures.
Unfortunately PyNACL currently has a few issues
(https://github.com/pyca/pynacl/issues/53) and
(https://github.com/pyca/pynacl/issues/79) that mean it may not install
correctly, causing all tests to fail with errors about missing "sodium.h". To
fix try re-installing from PyPI or directly from
(https://github.com/pyca/pynacl)::

    $ # Install from PyPI
    $ pip install --user --upgrade --force pynacl
    $ # Install from github
    $ pip install --user https://github.com/pyca/pynacl/tarball/master


Homeserver Development
======================

To check out a homeserver for development, clone the git repo into a working
directory of your choice:

    $ git clone https://github.com/matrix-org/synapse.git
    $ cd synapse

The homeserver has a number of external dependencies, that are easiest
to install by making setup.py do so, in --user mode::

    $ python setup.py develop --user

This will run a process of downloading and installing into your
user's .local/lib directory all of the required dependencies that are
missing.

Once this is done, you may wish to run the homeserver's unit tests, to
check that everything is installed as it should be::

    $ python setup.py test

This should end with a 'PASSED' result::

    Ran 143 tests in 0.601s

    PASSED (successes=143)


Upgrading an existing homeserver
================================

IMPORTANT: Before upgrading an existing homeserver to a new version, please
refer to UPGRADE.rst for any additional instructions.


Setting up Federation
=====================

In order for other homeservers to send messages to your server, it will need to
be publicly visible on the internet, and they will need to know its host name.
You have two choices here, which will influence the form of your Matrix user
IDs:

1) Use the machine's own hostname as available on public DNS in the form of
   its A or AAAA records. This is easier to set up initially, perhaps for
   testing, but lacks the flexibility of SRV.

2) Set up a SRV record for your domain name. This requires you create a SRV
   record in DNS, but gives the flexibility to run the server on your own
   choice of TCP port, on a machine that might not be the same name as the
   domain name.

For the first form, simply pass the required hostname (of the machine) as the
--server-name parameter::

    $ python -m synapse.app.homeserver \
        --server-name machine.my.domain.name \
        --config-path homeserver.config \
        --generate-config
    $ python -m synapse.app.homeserver --config-path homeserver.config

Alternatively, you can run ``synctl start`` to guide you through the process.

For the second form, first create your SRV record and publish it in DNS. This
needs to be named _matrix._tcp.YOURDOMAIN, and point at at least one hostname
and port where the server is running.  (At the current time synapse does not
support clustering multiple servers into a single logical homeserver).  The DNS
record would then look something like::

    $ dig -t srv _matrix._tcp.machine.my.domaine.name
    _matrix._tcp    IN      SRV     10 0 8448 machine.my.domain.name.


At this point, you should then run the homeserver with the hostname of this
SRV record, as that is the name other machines will expect it to have::

    $ python -m synapse.app.homeserver \
        --server-name YOURDOMAIN \
        --bind-port 8448 \
        --config-path homeserver.config \
        --generate-config
    $ python -m synapse.app.homeserver --config-path homeserver.config


You may additionally want to pass one or more "-v" options, in order to
increase the verbosity of logging output; at least for initial testing.

For the initial alpha release, the homeserver is not speaking TLS for
either client-server or server-server traffic for ease of debugging. We have
also not spent any time yet getting the homeserver to run behind loadbalancers.

Running a Demo Federation of Homeservers
----------------------------------------

If you want to get up and running quickly with a trio of homeservers in a
private federation (``localhost:8080``, ``localhost:8081`` and
``localhost:8082``) which you can then access through the webclient running at
http://localhost:8080. Simply run::

    $ demo/start.sh
    
This is mainly useful just for development purposes.

Running The Demo Web Client
===========================

The homeserver runs a web client by default at https://localhost:8448/.

If this is the first time you have used the client from that browser (it uses
HTML5 local storage to remember its config), you will need to log in to your
account. If you don't yet have an account, because you've just started the
homeserver for the first time, then you'll need to register one.


Registering A New Account
-------------------------

Your new user name will be formed partly from the hostname your server is
running as, and partly from a localpart you specify when you create the
account. Your name will take the form of::

    @localpart:my.domain.here
         (pronounced "at localpart on my dot domain dot here")

Specify your desired localpart in the topmost box of the "Register for an
account" form, and click the "Register" button. Hostnames can contain ports if
required due to lack of SRV records (e.g. @matthew:localhost:8448 on an
internal synapse sandbox running on localhost)


Logging In To An Existing Account
---------------------------------

Just enter the ``@localpart:my.domain.here`` Matrix user ID and password into
the form and click the Login button.


Identity Servers
================

The job of authenticating 3PIDs and tracking which 3PIDs are associated with a
given Matrix user is very security-sensitive, as there is obvious risk of spam
if it is too easy to sign up for Matrix accounts or harvest 3PID data.
Meanwhile the job of publishing the end-to-end encryption public keys for
Matrix users is also very security-sensitive for similar reasons.

Therefore the role of managing trusted identity in the Matrix ecosystem is
farmed out to a cluster of known trusted ecosystem partners, who run 'Matrix
Identity Servers' such as ``sydent``, whose role is purely to authenticate and
track 3PID logins and publish end-user public keys.

It's currently early days for identity servers as Matrix is not yet using 3PIDs
as the primary means of identity and E2E encryption is not complete. As such,
we are running a single identity server (http://matrix.org:8090) at the current
time.


Where's the spec?!
==================

The source of the matrix spec lives at https://github.com/matrix-org/matrix-doc.  
A recent HTML snapshot of this lives at http://matrix.org/docs/spec


Building Internal API Documentation
===================================

Before building internal API documentation install sphinx and
sphinxcontrib-napoleon::

    $ pip install sphinx
    $ pip install sphinxcontrib-napoleon

Building internal API documentation::

    $ python setup.py build_sphinx