304 lines
12 KiB
ReStructuredText
304 lines
12 KiB
ReStructuredText
TODO(kegan): Tweak joinalias API keys/path? Event stream historical > live needs
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a token (currently doesn't). im/sync responses include outdated event formats
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(room membership change messages). Room config (specifically: message history,
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public rooms). /register seems super simplistic compared to /login, maybe it
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would be better if /register used the same technique as /login? /register should
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be "user" not "user_id".
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How to use the client-server API
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================================
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This guide focuses on how the client-server APIs *provided by the reference
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home server* can be used. Since this is specific to a home server
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implementation, there may be variations in relation to registering/logging in
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which are not covered in extensive detail in this guide.
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If you haven't already, get a home server up and running on
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``http://localhost:8080``.
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Accounts
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========
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Before you can send and receive messages, you must **register** for an account.
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If you already have an account, you must **login** into it.
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**Try out the fiddle: http://jsfiddle.net/jrf1h02d/**
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Registration
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------------
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The aim of registration is to get a user ID and access token which you will need
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when accessing other APIs::
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curl -XPOST -d '{"user_id":"example", "password":"wordpass"}' "http://localhost:8080/_matrix/client/api/v1/register"
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{
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"access_token": "QGV4YW1wbGU6bG9jYWxob3N0.AqdSzFmFYrLrTmteXc",
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"home_server": "localhost",
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"user_id": "@example:localhost"
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}
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NB: If a ``user_id`` is not specified, one will be randomly generated for you.
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If you do not specify a ``password``, you will be unable to login to the account
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if you forget the ``access_token``.
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Implementation note: The matrix specification does not enforce how users
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register with a server. It just specifies the URL path and absolute minimum
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keys. The reference home server uses a username/password to authenticate user,
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but other home servers may use different methods.
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Login
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-----
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The aim when logging in is to get an access token for your existing user ID::
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curl -XGET "http://localhost:8080/_matrix/client/api/v1/login"
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{
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"type": "m.login.password"
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}
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curl -XPOST -d '{"type":"m.login.password", "user":"example", "password":"wordpass"}' "http://localhost:8080/_matrix/client/api/v1/login"
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{
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"access_token": "QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd",
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"home_server": "localhost",
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"user_id": "@example:localhost"
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}
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Implementation note: Different home servers may implement different methods for
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logging in to an existing account. In order to check that you know how to login
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to this home server, you must perform a ``GET`` first and make sure you
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recognise the login type. If you do not know how to login, you can
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``GET /login/fallback`` which will return a basic webpage which you can use to
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login. The reference home server implementation support username/password login,
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but other home servers may support different login methods (e.g. OAuth2).
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Communicating
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=============
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In order to communicate with another user, you must **create a room** with that
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user and **send a message** to that room.
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**Try out the fiddle: http://jsfiddle.net/jnwqcshc/**
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Creating a room
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---------------
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If you want to send a message to someone, you have to be in a room with them. To
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create a room::
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curl -XPOST -d '{"room_alias_name":"tutorial"}' "http://localhost:8080/_matrix/client/api/v1/rooms?access_token=QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd"
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{
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"room_alias": "#tutorial:localhost",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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The "room alias" is a human-readable string which can be shared with other users
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so they can join a room, rather than the room ID which is a randomly generated
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string. You can have multiple room aliases per room.
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TODO(kegan): How to add/remove aliases from an existing room.
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Sending messages
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----------------
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You can now send messages to this room::
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curl -XPUT -d '{"msgtype":"m.text", "body":"hello"}' "http://localhost:8080/_matrix/client/api/v1/rooms/%21CvcvRuDYDzTOzfKKgh:localhost/messages/%40example%3Alocalhost/msgid1?access_token=QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd"
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NB: There are no limitations to the types of messages which can be exchanged.
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The only requirement is that ``"msgtype"`` is specified.
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NB: Depending on the room config, users who join the room may be able to see
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message history from before they joined.
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Users and rooms
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===============
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Each room can be configured to allow or disallow certain rules. In particular,
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these rules may specify if you require an **invitation** from someone already in
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the room in order to **join the room**. In addition, you may also be able to
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join a room **via a room alias** if one was set up.
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**Try out the fiddle: http://jsfiddle.net/og1xokcr/**
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Inviting a user to a room
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-------------------------
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You can directly invite a user to a room like so::
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curl -XPUT -d '{"membership":"invite"}' "http://localhost:8080/_matrix/client/api/v1/rooms/%21CvcvRuDYDzTOzfKKgh:localhost/members/%40myfriend%3Alocalhost/state?access_token=QGV4YW1wbGU6bG9jYWxob3N0.vRDLTgxefmKWQEtgGd"
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This informs ``@myfriend:localhost`` of the room ID
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``!CvcvRuDYDzTOzfKKgh:localhost`` and allows them to join the room.
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Joining a room via an invite
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----------------------------
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If you receive an invite, you can join the room by changing the membership to
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join::
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curl -XPUT -d '{"membership":"join"}' "http://localhost:8080/_matrix/client/api/v1/rooms/%21CvcvRuDYDzTOzfKKgh:localhost/members/%40myfriend%3Alocalhost/state?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK"
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NB: Only the person invited (``@myfriend:localhost``) can change the membership
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state to ``"join"``.
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Joining a room via an alias
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---------------------------
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Alternatively, if you know the room alias for this room and the room config
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allows it, you can directly join a room via the alias::
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curl -XPUT -d '{}' "http://localhost:8080/_matrix/client/api/v1/join/%23tutorial%3Alocalhost?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK"
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{
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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You will need to use the room ID when sending messages, not the room alias.
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NB: If the room is configured to be an invite-only room, you will still require
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an invite in order to join the room even though you know the room alias. As a
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result, it is more common to see a room alias in relation to a public room,
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which do not require invitations.
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Getting events
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==============
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An event is some interesting piece of data that a client may be interested in.
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It can be a message in a room, a room invite, etc. There are many different ways
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of getting events, depending on what the client already knows.
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**Try out the fiddle: http://jsfiddle.net/5uk4dqe2/**
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Getting all state
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-----------------
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If the client doesn't know any information on the rooms the user is
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invited/joined on, they can get all the user's state for all rooms::
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curl -XGET "http://localhost:8080/_matrix/client/api/v1/im/sync?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK"
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[
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{
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"membership": "join",
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"messages": {
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"chunk": [
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{
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"content": {
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"body": "@example:localhost joined the room.",
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"hsob_ts": 1408444664249,
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"membership": "join",
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"membership_source": "@example:localhost",
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"membership_target": "@example:localhost",
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"msgtype": "m.text"
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},
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"event_id": "lZjmmlrEvo",
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"msg_id": "m1408444664249",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "_homeserver_"
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},
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{
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"content": {
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"body": "hello",
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"hsob_ts": 1408445405672,
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"msgtype": "m.text"
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},
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"event_id": "BiBJqamISg",
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"msg_id": "msgid1",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "@example:localhost"
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},
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[...]
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{
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"content": {
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"body": "@myfriend:localhost joined the room.",
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"hsob_ts": 1408446501661,
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"membership": "join",
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"membership_source": "@myfriend:localhost",
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"membership_target": "@myfriend:localhost",
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"msgtype": "m.text"
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},
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"event_id": "IMmXbOzFAa",
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"msg_id": "m1408446501661",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "_homeserver_"
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}
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],
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"end": "20",
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"start": "0"
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},
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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]
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This returns all the room IDs of rooms the user is invited/joined on, as well as
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all of the messages and feedback for these rooms. This can be a LOT of data. You
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may just want the most recent message for each room. This can be achieved by
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applying pagination stream parameters to this request::
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curl -XGET "http://localhost:8080/_matrix/client/api/v1/im/sync?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK&from=END&to=START&limit=1"
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[
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{
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"membership": "join",
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"messages": {
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"chunk": [
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{
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"content": {
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"body": "@myfriend:localhost joined the room.",
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"hsob_ts": 1408446501661,
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"membership": "join",
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"membership_source": "@myfriend:localhost",
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"membership_target": "@myfriend:localhost",
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"msgtype": "m.text"
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},
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"event_id": "IMmXbOzFAa",
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"msg_id": "m1408446501661",
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost",
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"type": "m.room.message",
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"user_id": "_homeserver_"
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}
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],
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"end": "20",
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"start": "21"
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},
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"room_id": "!CvcvRuDYDzTOzfKKgh:localhost"
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}
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]
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Getting live state
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------------------
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Once you know which rooms the client has previously interacted with, you need to
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listen for incoming events. This can be done like so::
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curl -XGET "http://localhost:8080/_matrix/client/api/v1/events?access_token=QG15ZnJpZW5kOmxvY2FsaG9zdA...XKuGdVsovHmwMyDDvK&from=END"
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{
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"chunk": [],
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"end": "215",
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"start": "215"
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}
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This will block waiting for an incoming event, timing out after several seconds.
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Even if there are no new events (as in the example above), there will be some
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pagination stream response keys. The client should make subsequent requests
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using the value of the ``"end"`` key (in this case ``215``) as the ``from``
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query parameter. This value should be stored so when the client reopens your app
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after a period of inactivity, you can resume from where you got up to in the
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event stream. If it has been a long period of inactivity, there may be LOTS of
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events waiting for the user. In this case, you may wish to get all state instead
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and then resume getting live state from a newer end token.
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NB: The timeout can be changed by adding a ``timeout`` query parameter, which is
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in milliseconds. A timeout of 0 will not block.
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Example application
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-------------------
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The following example demonstrates registration and login, live event streaming,
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creating and joining rooms, sending messages, getting member lists and getting
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historical messages for a room. This covers most functionality of a messaging
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application.
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**Try out the fiddle: http://jsfiddle.net/L8r3o1wr/**
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