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nbransby / chatkit-core

A kit for chattery.

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chatkit-core

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The client for Pusher Chatkit. If you aren't already here, you can find the source on Github.

For more information on the Chatkit service, see here. For full documentation, see here

The SDK is written in Kotlin, but aimed to be as Java-friendly as possible.

Index:

Features

  • Creating, joining, and deleting rooms
  • Adding and removing users to rooms
  • Sending and receiving messages to and from rooms, with attachments
  • Seeing who's currently in a room
  • Seeing who's currently online

Setup

Include it in project

You can install the SDK via Gradle. First add this to your $PROJECT_ROOT/app/build.gradle

dependencies {
    // ...
    implementation 'com.pusher:chatkit-android:$chatkit-version'
}

Usage

Instantiate Chatkit

To get started with Chatkit you will need to instantiate both a ChatManager instance as well as a TokenProvider instance to authenticate users. The example below uses demo credentials.

Builder pattern

TokenProvider - testTokenProvider

We provide you with a sample token provider implementation. You can enable / disable it in the dashboard. To include it in your application, create it with your details, as such:

const val INSTANCE_LOCATOR = "v1:us1:80215247-1df3-4956-8ba8-9744ffd12161"
const val TOKEN_PROVIDER_ENDPOINT = "your.auth.url"
const val USER_ID = "sarah"

val chatManager = ChatManager(
    instanceLocator = INSTANCE_LOCATOR,
    userId = USER_ID,
    dependencies = AndroidChatkitDependencies(
        context = getApplicationContext(),
        tokenProvider = ChatkitTokenProvider(TOKEN_PROVIDER_ENDPOINT, USER_ID)
    )
)

This is how we do it on our demo app: ChatkitDemoApp

  • instanceLocator: You can find this in the "Keys" section of our dashboard: https://dash.pusher.com/

  • userId: Used to identify the user that will be connected with this ChatManager instance.

  • dependencies: Contains some requirements needed for ChatManager. We provide a ready made type for ChatkitDependencies for android, so all you have to do is provide a Context and a TokenProvider.

We also have available an implementation for tokenProvider which just needs the url to authorize users. If you have enabled the test token provider on the Settings section of our dashboard, you can get a test url for this purpose in there. For production applications you have to create your own server side. More information about this can be found here: https://docs.pusher.com/chatkit/reference/server-node.

Token provider

Although we provide a version of the TokenProvider that works with a url to a remove token provider (ChatkitTokenProvider), it is possible to create a custom one. These are the functions required by the TokenProvider interface:

Function Params Return Description
fetchToken tokenParams (Any, Object`) Future<Result<String, Error>> Provides a string with the token or an error if failed (it can be cached)
clearToken String Unit, void Called when chatkit requires a fresh token

The implementation of ChatkitTokenProvider has the following properties:

Property Type Description
endpoint String Url for the server that provides access tokens
userId String Name of the user login in
authData Map<String, String> (Optional) CustomData sent to the server
client OkHttpClient (Optional) Used for networking (i.e. can modify to use proxy)
tokenCache TokenCache (Optional) By default we use an in memory but can provide a custom TokenCache

Connecting

The simplest way to connect returns a Future which will provide either a CurrentUser or an Error.

val futureUser: Future<Result<CurrentUser, Error>> = chatManager.connect()

You can observe the result from your favourite threading tool. We also provide a convenience extension that makes it more semantic to wait for the results of the future:

val userResult = futureUser.wait() // waits 10 seconds by default
//or
val userResult = futureUser.wait(For(30, SECONDS))

Note: both get() and wait() will block the current thread so make sure that you are on a background thread.

To consume the result we can do this:

chatManager.connect().wait().let { result ->
  when(result) { // Result<CurrentUser, Error>
    is Result.Success -> toast("User received: ${result.value.name})")
    is Result.Failure -> toast("Oops: ${result.error})")
  }
}

Alternatively, we have included a fold method too:

chatManager.connect().wait().fold(
  onSuccess = { user -> toast("User received: ${user.name})") },
  onFailure = { error -> toast("Oops: ${result.error})") }
)

If you are using coroutines this can be wrapped into a suspending method like this:

suspend fun ChatManager.connectForUser(): Result<CurrentUser, Error> =
  suspendCoroutine{ c -> c.resume(connect().wait()) }

// or, if want to treat error as an exception:

suspend fun ChatManager.connectForUser(): CurrentUser = suspendCoroutine { c ->
  connect().wait().let { result ->
    when(result) { // Result<CurrentUser, Error>
      is Result.Success -> c.resume(result.value)
      is Result.Failure -> c.resumeWithException(RuntimeException(result.error.reason))
    }
  }
}

If you use RxJava you can wrap this inside a Single:

fun ChatManager.connectForUser(): Single<CurrentUser> = Single.create { emitter ->
  connect().wait().let { result ->
    when(result) { // Result<CurrentUser, Error>
      is Result.Success -> emitter.onSuccess(result.value)
      is Result.Failure -> emitter.onError(RuntimeException(result.error.reason))
    }
  }
}

Result

We've been referring to Result without any explanation. It is nothing more than a rename of the functional pattern called Either. A Result can either have a success or a failure. If you want to learn more about this we go into details here

Chat events

When connecting to ChatManager we can also register for global events.

If you only care about a number of events you can provide a ChatManagerListeners implementation with the events you want:

val user = chatManager.connect(ChatManagerListeners(
      onUserCameOnline = { user -> toast("${user.name} came online") },
      onUserWentOffline = { user -> toast("${user.name} went ofline") }
))

Alternatively you can listen to all events with a single listener:

val user = chatManager.connect { event ->
  when(event) {
    is UserCameOnline -> toast("${event.user.name} came online")
    is UserWentOffline -> toast("${event.user.name} went ofline")
  }
}

The available events are:

Event Properties Description
CurrentUserReceived CurrentUser Happens when the logged user is available or updated
UserStartedTyping User, Room User has started typing
UserStoppedTyping User, Room User has stopped typing
UserJoinedRoom User, Room User has joined the provided room
UserLeftRoom User, Room User has left the provided room
UserCameOnline User User is now online
UsersUpdated Nothing User is now offline
CurrentUserAddedToRoom Room Current user was added to a room
CurrentUserRemovedFromRoom Int (room id) Current user was removed from a room with the given id
RoomUpdated Room Happens when the logged user is available or updated
RoomDeleted Int (room id) Happens when the logged user is available or updated
NewReadCursor Int (room id) Happens when a new cursor is set for CurrentUser
ErrorOccurred (Pusher)Error An error occurred, it does not mean the subscription has finished

Each of the events have a relevant listener that can be set on ChatManagerListeners

Termination

When you are done using the ChatkitManager you can call the close function which will try to terminate any pending requests and/or subscriptions.

chatManager.close()

CurrentUser

When an initial connection is successfully made to Chatkit the client will receive a CurrentUser object. The CurrentUser object is the primary means of interacting with Chatkit.

Property Type Description
rooms List The rooms that the connected user is a member of.
users Future<Result<List, Error> The users that share a common room membership with the connected user.

The users property is a Future because it may not have all the required information for all the users so it must go get it, which in turn may fail.

Rooms

There are a few important things to remember about Chatkit rooms; they are either public or private, users that are members of a room can change over time, all chat messages belong to a room.

Property Type Description
id Int The global identifier for the room on the instance.
createdById Int The id of the user that created this room
name String The human readable name of the room (this needn’t be unique!)
memberUserIds Set A set of ids for everyone on the room
isPrivate Boolean If true the room is private, otherwise the room is public.

Creating a room

All that you need to provide when creating a room is a name. The user that creates the room will automatically be added as a member of the room.

The following code will create a public room called "my room name". Note that a room name must be no longer than 60 characters.

val newRoom: Future<Result<Room, Error>> = currentUser.createRoom("my room name")

Same as before, the result can be consumed (inside a background thread) like:

currentUser.createRoom("my room name").wait().fold(
  onSuccess = { room -> toast("Hurra! room created: ${room.name})") },
  onFailure = { error -> toast("Oops: ${result.error})") }
)

If you want to make a private room ir can be done:

currentUser.createRoom(
  name = "my room name",
  private = true
)

Also, you may choose to provide an initial number of users to be part of that room (i.e. one-to-one conversations), in which case you can also provide it with a list of users:

currentUser.createRoom(
  name = "my room name",
  userIds = listOf("sarah", "pusherino")
)

Fetching messages for a Room

You can fetch up to the last 100 messages added to a room when you subscribe (Using messageLimit) but sometimes you’ll want to fetch older messages. For example, suppose you subscribe to a room and the oldest message you see has the ID 42. To see older messages, you can provide the initialId option to the fetchMessages method.

currentUser.fetchMessages(
  room = someRoom,
  initialId = 42, // Optional
  direction = NEWER_FIRST, // Optional, OLDER_FIRST by default
  limit = 20 // Optional, 10 by default
).wait().let { result ->
  when(result) { // Result<List<Message>, Error>
    is Result.Success -> toast("Messages ${result.value} received.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Instead of a room instance it is also possible to fetch messages using the room id.

currentUser.fetchMessages(roomId = 123)

The full set of options follows:

Property Type Description
initialId Int (Optional) A message ID that defaults to the most recent message ID.
direction Direction (Optional) Defaults to OLDER_FIRST, dictates the direction of the messages being returned.
limit Int (Optional) Limits the number of messages that we get back, defaults to 10.

Add User to a Room

The current user can add users to rooms that they themselves are a member of.

currentUser.addUsersToRoom(
  userIds = listOf("keith"),
  room = someRoom
).wait().let { result ->
  when(result) { // Result<Unit, Error>
    is Result.Success -> toast("Successfully added users.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Remove user from a Room

The current user can remove users from rooms that they themselves are a member of.

currentUser.removeUsersFromRoom(
  userIds = listOf("keith"),
  room = someRoom
).wait().let { result ->
  when(result) { // Result<Unit, Error>
    is Result.Success -> toast("Successfully removed users.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Get joinable Rooms

To fetch a list of the rooms that a user is able to join (but isn’t yet a member of):

currentUser.getJoinableRooms().wait().let { result ->
 when(result) {  // Result<List<Room>, Error>
   is Result.Success -> toast("The user can join ${result.value}.")
   is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
 }
}

The rooms returned will be a list of the public rooms which the currentUser is not a member of.

Joining a Room

Join a room with ID someRoomId:

currentUser.joinRoom(
  roomId = someRoomId
).wait().let { result ->
  when(result) { // Result<Room, Error>
    is Result.Success -> toast("CurrentUser joined room: ${result.value.name}.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Leaving a Room

Leave a room with ID someRoomId:

currentUser.leaveRoom(
  roomId = someRoomId
).wait().let { result ->
  when(result) { // Result<Int, Error>
    is Result.Success -> toast("CurrentUser left room: ${result.value.name}.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Update a Room

Change the name and or privacy of a room with Id someRoomId:

currentUser.updateRoom(
  roomId = someRoomId,
  name = "Some updated name",
  private = false // Optional
).let { result ->
  when(result) { // Result<Unit, Error>
    is Result.Success -> toast("Updated room.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

All other connected members of the room will receive an event that informs them that the room has been updated. Note that the current user must have the room:update permission to use this method.

Note: This only returns whether the action is successful. To get the new room we have to handle the event that we get or fetch a new room.

Delete a Room

Delete a room with ID someRoomId:

currentUser.deleteRoom(
  roomId = someRoomId
).let { result ->
  when(result) { // Result<Unit, Error>
    is Result.Success -> toast("Updated room.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

All other connected members of the room will receive an event that informs them that the room has been deleted. Any attempts to interact with a deleted room will result in an error. Note that the current user must have the room:delete permission to use this method.

Note: Deleting a room will delete all the associated messages too.

Subscriptions

To be notified when new messages are added to a room, you’ll need to subscribe to it and provide a RoomSubscriptionListeners instance or a lambda to listen for RoomSubscriptionEvent. (Too see the full list of possible hooks see Room Subscription Hooks). At most 100 recent messages can be retrieved on subscription, to fetch older messages see Fetching Messages From a Room. To receive only new messages, set the messageLimit to 0.

Using RoomSubscriptionListeners:

currentUser.subscribeToRoom(
  roomId = someroomId,
  listeners = Roomsubscription(
    onNewMessage = { message -> toast("${message.userId} says: ${message.text}") },
    onErrorOccurred = { error -> toast("Oops something bad happened: $error") }
  ),
  messageLimit = 10 // Optional, 10 by default
)

Using RoomSubscriptionEvent:

currentUser.subscribeToRoom(
    roomId = someroomId,
    messageLimit = 10 // Optional, 10 by default
) { event ->
  when(event) {
    is NewMessage -> toast("${event.message.userId} says: ${event.message.text}")
    is ErrorOccurred -> toast("Oops something bad happened: ${event.error}")
  }
}

Note: Subscribing implicitly joins a room if you aren’t already a member. Subscribing to the same room twice will cause the existing subscription to be cancelled and replaced by the new one.

By default when you subscribe to a room you will receive up to the 10 most recent messages that have been added to the room. The number of recent messages to fetch can be configured by setting the messageLimit parameter. These recent messages will be passed to the onNewMessagecallback (or asNewMessage` event) in the order they were sent, just as if they were being sent for the first time.

Room subscription events

This is the full list of available events from a room subscription:

Event Properties Description
NewMessage Message A new message has been added to the room.
UserStartedTyping User User has started typing
UserStoppedTyping User User has stopped typing
UserJoined Int (userId) User has joined the room
UserLeft Int (userId) User has left the room
UserCameOnline User User is now online
UserWentOffline User User is now offline
NewReadCursor Cursor A member of the room set a new read cursor.

Each of the events have a relevant listener that can be set on RoomSubscriptionListeners

Cancel a subscription

The subscribeToRoom function returns a Subscription that can be cancelled by calling subscription.unsubscribe() when the subscription is no longer needed.

Alternatively, it is possible to close all active subscriptions by calling chatManager.cancel(), which will close all these subscriptions.

Users

User objects can be found in various places: globally under currentUser.users or returned as the argument to some callbacks.

User properties

Property Type Description
id String The unique identifier for the user on the instance.
name String The human readable name of the user. This is not required to be unique.
avatarUrl String The location (url) of an avatar for the user.
presence Presence An object containing information regarding the users presence state. See user presence.

Rooms contain a list of user ids, to resolve these you can use this:

currentUser.usersforRoom(someRoom)

Messages

Every message belongs to a Room and has an associated sender, which is represented by a User object. Files can be sent along with a messages by specifying an Attachment property.

Message properties

Property Type Description
id Int The Id assigned to the message by the Chatkit servers.
text String The text content of the message if present.
attachment Attachment The message’s attachment if present.
sender User The user who sent the message.
room Room The room to which the message belongs.
createdAt String The timestamp at which the message was created.
updatedAt String The timestamp at which the message was last updated.

Sending a message

To send a message:

currentUser.sendMessage(
  room = someRoom, // also available as roomId: Int
  messageTest = "Hi there! 👋",
  attachment = NoAttachment // Optional, NoAttachment by default
).wait().let { result ->
  when(result) { // Result<Int, Error>, either the new message id or an error
    is Result.Success -> toast("CurrentUser left room: ${result.value.name}.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

An attachment can be added when you send a message. This can be done in one of two ways:

  1. Provide some data (of type [File], most likely) along with a name for the data that will be used as the name of the file that is stored by the Chatkit servers.

This is how you send a message with an attachment of this kind:

currentUser.sendMessage(
  room = someRoom,
  messageTest = "Hi there! 👋",
  attachment = DataAttachment(
    file = File("file/path.jpg"),
    name = "file-name" // optional, "file" by default
  )
).wait().let { result ->
  when(result) { // Result<Int, Error>, either the new message id or an error
    is Result.Success -> toast("CurrentUser left room: ${result.value.name}.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Note that the resulting type will be inferred automatically by Chatkit servers. If the type of the file is unable to be determined then it will be given a type of file.

  1. Provide a link along with a type that describes the attachment. As above, this would be one of image, video, audio, or file.

This is how you send a message with an attachment of this kind:

currentUser.sendMessage(
  room = someRoom,
  messageTest = "Hi there! 👋",
  attachment = LinkAttachment(
    link = File("file/path.jpg"),
    type = AttachmentType.IMAGE
  )
).wait().let { result ->
  when(result) { // Result<Int, Error>, either the new message id or an error
    is Result.Success -> toast("CurrentUser left room: ${result.value.name}.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Attachment

It is possible for users to attach files to messages. If a message has an attachment you will most likely have to fetch it before you can use it. This will give you the actual URL of the resource.

Attachment properties

Property Type Description
link String The link representing the location of the attachment.
type AttachmentType The type of the attachment; one of image, video, audio, or file.
fetchRequired Boolean If the attachment link needs to be fetched from the Chatkit servers; see Fetch an Attachment.

Fetching an attachment

If a message contains an attachment with the fetchRequired property set to true, then attachment.link cannot be used directly. We must first fetch the URL of the attachment itself using fetchAttachment.

currentUser.fetchAttachment(
  attachmentUrl = message.link
).wait().let { result -> // Future<Result<FetchedAttachment, Error>>
  when(result) { // Result<Int, Error>, either the new message id or an error
    is Result.Success -> toast("Loaded attachment: ${result.value.link}.")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Typing indicators

Sometimes it’s useful to be able to see if another user is typing. You can use Chatkit to let all the connected members of a room know when another user is typing.

Trigger a typing event

To send typing indicator events call isTypingIn with the id of the room the current user is typing in.

currentUser.isTypingIn(
  roomId = room.id
).wait().let { result -> // Future<Result<Unit, Error>>
   when(result) { // Result<Int, Error>, either the new message id or an error
     is Result.Success -> toast("Success!")
     is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
   }
 }

Receive typing indicators

To be notified when a user starts or stops typing in a room, provide a onUserStartedTyping and a onUserStoppedTyping function as part of the room subscription listener.

RoomSubscription(
  onUserStartedTyping = { user, room -> toast("User ${user.name} started typing") },
  onUserStoppedTyping = { user, room -> toast("User ${user.name} stopped typing") }
)

Alternatively, if you are using an event callback:

{ event ->
  when(event) {
    is UserStartedTyping -> toast("User ${event.user.name} started typing in room ${event.room.name}")
    is UserStoppedTyping -> toast("User ${event.user.name} stopped typing in room ${event.room.name}")

  }
}

User presence

If a user has at least one active connection to the Chatkit service then they are considered online. When a user has no active connections they are considered offline. Each user object keeps track of whether a user is online or offline via the presence property.

if(user.presence is User.Presence.Online) {
  // The user is online! Show an online badge or something...
}

Additionally, to be notified when a user comes online or goes offline, you can provide the onUserCameOnline and onUserWentOffline listeners or match the UserCameOnline and UserWentOffline events. Either at the room level – fires whenever a member of that room goes on or off line, or at the connection level – fires whenever any users sharing a common room membership go on or offline.

chatManager.connect { event ->
  when(event) {
    is UserCameOnline -> toast("User ${event.user.name} came online.")
    is UserWentOffline -> toast("User ${event.user.name} went offline.")
  }
}

Cursors

Read cursors track how far a user has read through the messages in a room. Each read cursor belongs to a user and a room – represented by a Cursor object.

Cursor properties

Property Type Description
position String The message ID that the user has read up to.
updatedAt String The timestamp when the cursor was last set.
room Int (room id) The room that the cursor refers to.
user String (user id) The user that the cursor belongs to.
type Int The type of the cursor object, currently always 0 (representing a read cursor).

Setting a cursor

When you are confident that the current user has “read” a message, call setReadCursor with a roomId and a position (the id of the newest message that has been “read”).

currentUser.setReadCursor(
  roomId = someRoomId,
  position = someMessageId
).wait().let { result -> // Future<Result<Int, Error>>
  when(result) {
    is Result.Success -> toast("Cursor set!")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

Getting a cursor

The current user’s read cursors are available immediately upon connecting. Access any existing cursors with the readCursor function. (A cursor that hasn’t been set yet is undefined.)

currentUser.readCursor(
  roomId: someRoomId
)

Note: To be notified when any of the current user’s read cursors are changed, supply an onNewReadCursor listener on connection or match for NewReadCursor events.

Access other user's cursors

After subscribing to a room, read cursors for members of that room can be accessed by supplying a userId as the second parameter to the readCursor method.

currentUser.getReadCursor(
  roomId: someRoomId,
  userId: "alice"
).wait().let { result -> // Future<Result<Cursor, Error>>
  when(result) {
    is Result.Success -> toast("Cursor: ${result.cursor}!")
    is Result.Failure -> toast("Oops, something bad happened: ${result.error}")
  }
}

To be notified when any member of the room changes their read cursor, supply an onNewReadCursor listener when subscribing to the room or match the NewReadCursor event.

Logger

As part of ChatManager dependencies a custom logger can be provided:

val chatManager = ChatManager(
    instanceLocator = INSTANCE_LOCATOR,
    userId = USER_ID,
    dependencies = AndroidChatkitDependencies(
        context = getApplicationContext(),
        tokenProvider = ChatkitTokenProvider(TOKEN_PROVIDER_ENDPOINT),
        logger = object : Logger {
          fun verbose(message: String, error: Error? = null) = println("V: $message")
          fun debug(message: String, error: Error? = null) = println("D: $message")
          fun info(message: String, error: Error? = null) = println("I: $message")
          fun warn(message: String, error: Error? = null) = println("W: $message")
          fun error(message: String, error: Error? = null) = println("E: $message")
        }
    )
)

Development build

When building this project, you may choose to use a local version of pusher-platform-android.

To do so you can add the path to your local copy in your ~/.gradle/gradle.properties:

pusher_platform_local=../pusher-platform-android

It can be either a relative or absolute path.

About

A kit for chattery.

License:MIT License

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Language:Kotlin 100.0%