# ATP API

This API is a client for ATProtocol servers. It communicates using HTTP. It includes:

- ✔️ APIs for ATProto and Bluesky.
- ✔️ Validation and complete typescript types.
- ✔️ Session management.
- ✔️ A RichText library.

## Getting started

First install the package:

```sh
yarn add @atproto/api
```

Then in your application:

```typescript
import { Agent, CredentialSession } from '@atproto/api'

const session = new CredentialSession(new URL('https://bsky.social'))
await session.login(account)
const agent = new Agent(session)
```

## Usage

### Session management

You'll need an authenticated session for most API calls. There are two ways to
manage sessions:

1. [App password based session management](#app-password-based-session-management)
2. [OAuth based session management](#oauth-based-session-management)

#### App password based session management

Username / password based authentication can be performed using the `Agent`
class.

> [!CAUTION]
>
> This method is deprecated in favor of OAuth based session management. It is
> recommended to use OAuth based session management (through the
> `@atproto/oauth-client-*` packages).

```typescript
import { Agent, CredentialSession, type AtpAgentLoginOpts } from '@atproto/api'

// Configure connection to the server with authentification
const account: AtpAgentLoginOpts = {
  identifier: 'your.bsky.social',
  password: 'xxxx-xxxx-xxxx-xxxx',
}

async function authenticate(account: AtpAgentLoginOpts): Promise<Agent> {
  const session = new CredentialSession(new URL('https://example.com'))
  await session.login(account)
  const agent = new Agent(session)
  return agent
}

;(async () => {
  console.log('Authenticating...')
  const agent = await authenticate(account)
  console.log(`Authenticated as from: ${agent.sessionManager.did}`)
})()
```

#### OAuth based session management

Depending on the environment used by your application, different OAuth clients
are available:

- [@atproto/oauth-client-browser](https://www.npmjs.com/package/@atproto/oauth-client-browser):
  for the browser.
- [@atproto/oauth-client-node](https://www.npmjs.com/package/@atproto/oauth-client-node): for
  Node.js.
- [@atproto/oauth-client](https://www.npmjs.com/package/@atproto/oauth-client):
  Lower level; compatible with most JS engines.

Every `@atproto/oauth-client-*` implementation has a different way to obtain an
`OAuthSession` instance that can be used to instantiate an `Agent` (from
`@atproto/api`). Here is an example restoring a previously saved session:

```typescript
import { Agent } from '@atproto/api'
import { OAuthClient } from '@atproto/oauth-client'

const oauthClient = new OAuthClient({
  // ...
})

const oauthSession = await oauthClient.restore('did:plc:123')

// Instantiate the api Agent using an OAuthSession
const agent = new Agent(oauthSession)
```

### API calls

The agent includes methods for many common operations, including:

```typescript
// The DID of the user currently authenticated (or undefined)
agent.did
agent.accountDid // Throws if the user is not authenticated

// Feeds and content
await agent.getTimeline(params, opts)
await agent.getAuthorFeed(params, opts)
await agent.getPostThread(params, opts)
await agent.getPost(params)
await agent.getPosts(params, opts)
await agent.getLikes(params, opts)
await agent.getRepostedBy(params, opts)
await agent.post(record)
await agent.deletePost(postUri)
await agent.like(uri, cid)
await agent.deleteLike(likeUri)
await agent.repost(uri, cid)
await agent.deleteRepost(repostUri)
await agent.uploadBlob(data, opts)

// Social graph
await agent.getFollows(params, opts)
await agent.getFollowers(params, opts)
await agent.follow(did)
await agent.deleteFollow(followUri)

// Actors
await agent.getProfile(params, opts)
await agent.upsertProfile(updateFn)
await agent.getProfiles(params, opts)
await agent.getSuggestions(params, opts)
await agent.searchActors(params, opts)
await agent.searchActorsTypeahead(params, opts)
await agent.mute(did)
await agent.unmute(did)
await agent.muteModList(listUri)
await agent.unmuteModList(listUri)
await agent.blockModList(listUri)
await agent.unblockModList(listUri)

// Notifications
await agent.listNotifications(params, opts)
await agent.countUnreadNotifications(params, opts)
await agent.updateSeenNotifications()

// Identity
await agent.resolveHandle(params, opts)
await agent.updateHandle(params, opts)

// Legacy: Session management should be performed through the SessionManager
// rather than the Agent instance.
if (agent instanceof AtpAgent) {
  // AtpAgent instances support using different sessions during their lifetime
  await agent.createAccount({ ... }) // session a
  await agent.login({ ... }) // session b
  await agent.resumeSession(savedSession) // session c
}
```

### Validation and types

The package includes a complete types system which includes validation and type-guards. For example, to validate a post record:

```typescript
import { AppBskyFeedPost } from '@atproto/api'

const post = {...}
if (AppBskyFeedPost.isRecord(post)) {
  // typescript now recognizes `post` as a AppBskyFeedPost.Record
  // however -- we still need to validate it
  const res = AppBskyFeedPost.validateRecord(post)
  if (res.success) {
    // a valid record
  } else {
    // something is wrong
    console.log(res.error)
  }
}
```

### Rich text

Some records (ie posts) use the `app.bsky.richtext` lexicon. At the moment richtext is only used for links and mentions, but it will be extended over time to include bold, italic, and so on.

ℹ️ It is **strongly** recommended to use this package's `RichText` library. Javascript encodes strings in utf16 while the protocol (and most other programming environments) use utf8. Converting between the two is challenging, but `RichText` handles that for you.

```typescript
import { RichText } from '@atproto/api'

// creating richtext
const rt = new RichText({
  text: 'Hello @alice.com, check out this link: https://example.com',
})
await rt.detectFacets(agent) // automatically detects mentions and links
const postRecord = {
  $type: 'app.bsky.feed.post',
  text: rt.text,
  facets: rt.facets,
  createdAt: new Date().toISOString(),
}

// rendering as markdown
let markdown = ''
for (const segment of rt.segments()) {
  if (segment.isLink()) {
    markdown += `[${segment.text}](${segment.link?.uri})`
  } else if (segment.isMention()) {
    markdown += `[${segment.text}](https://my-bsky-app.com/user/${segment.mention?.did})`
  } else {
    markdown += segment.text
  }
}

// calculating string lengths
const rt2 = new RichText({ text: 'Hello' })
console.log(rt2.length) // => 5
console.log(rt2.graphemeLength) // => 5
const rt3 = new RichText({ text: '👨‍👩‍👧‍👧' })
console.log(rt3.length) // => 25
console.log(rt3.graphemeLength) // => 1
```

### Moderation

Applying the moderation system is a challenging task, but we've done our best to simplify it for you. The Moderation API helps handle a wide range of tasks, including:

- Moderator labeling
- User muting (including mutelists)
- User blocking
- Mutewords
- Hidden posts

For more information, see the [Moderation Documentation](./docs/moderation.md).

```typescript
import { moderatePost } from '@atproto/api'

// First get the user's moderation prefs and their label definitions
// =

const prefs = await agent.getPreferences()
const labelDefs = await agent.getLabelDefinitions(prefs)

// We call the appropriate moderation function for the content
// =

const postMod = moderatePost(postView, {
  userDid: agent.session.did,
  moderationPrefs: prefs.moderationPrefs,
  labelDefs,
})

// We then use the output to decide how to affect rendering
// =

// in feeds
if (postMod.ui('contentList').filter) {
  // don't include in feeds
}
if (postMod.ui('contentList').blur) {
  // render the whole object behind a cover (use postMod.ui('contentList').blurs to explain)
  if (postMod.ui('contentList').noOverride) {
    // do not allow the cover the be removed
  }
}
if (postMod.ui('contentList').alert || postMod.ui('contentList').inform) {
  // render warnings on the post
  // find the warnings in postMod.ui('contentList').alerts and postMod.ui('contentList').informs
}

// viewed directly
if (postMod.ui('contentView').filter) {
  // don't include in feeds
}
if (postMod.ui('contentView').blur) {
  // render the whole object behind a cover (use postMod.ui('contentView').blurs to explain)
  if (postMod.ui('contentView').noOverride) {
    // do not allow the cover the be removed
  }
}
if (postMod.ui('contentView').alert || postMod.ui('contentView').inform) {
  // render warnings on the post
  // find the warnings in postMod.ui('contentView').alerts and postMod.ui('contentView').informs
}

// post embeds in all contexts
if (postMod.ui('contentMedia').blur) {
  // render the whole object behind a cover (use postMod.ui('contentMedia').blurs to explain)
  if (postMod.ui('contentMedia').noOverride) {
    // do not allow the cover the be removed
  }
}
```

## Advanced

### Advanced API calls

The methods above are convenience wrappers. It covers most but not all available methods.

The AT Protocol identifies methods and records with reverse-DNS names. You can use them on the agent as well:

```typescript
const res1 = await agent.com.atproto.repo.createRecord({
  did: alice.did,
  collection: 'app.bsky.feed.post',
  record: {
    $type: 'app.bsky.feed.post',
    text: 'Hello, world!',
    createdAt: new Date().toISOString(),
  },
})
const res2 = await agent.com.atproto.repo.listRecords({
  repo: alice.did,
  collection: 'app.bsky.feed.post',
})

const res3 = await agent.app.bsky.feed.post.create(
  { repo: alice.did },
  {
    text: 'Hello, world!',
    createdAt: new Date().toISOString(),
  },
)
const res4 = await agent.app.bsky.feed.post.list({ repo: alice.did })
```

### Non-browser configuration

If your environment doesn't have a built-in `fetch` implementation, you'll need
to provide one. This will typically be done through a polyfill.

### Bring your own fetch

If you want to provide your own `fetch` implementation, you can do so by
instantiating the sessionManager with a custom fetch implementation:

```typescript
import { AtpAgent } from '@atproto/api'

const myFetch = (input: RequestInfo | URL, init?: RequestInit) => {
  console.log('requesting', input)
  const response = await globalThis.fetch(input, init)
  console.log('got response', response)
  return response
}

const agent = new AtpAgent({
  service: 'https://example.com',
  fetch: myFetch,
})
```

## License

This project is dual-licensed under MIT and Apache 2.0 terms:

- MIT license ([LICENSE-MIT.txt](https://github.com/bluesky-social/atproto/blob/main/LICENSE-MIT.txt) or http://opensource.org/licenses/MIT)
- Apache License, Version 2.0, ([LICENSE-APACHE.txt](https://github.com/bluesky-social/atproto/blob/main/LICENSE-APACHE.txt) or http://www.apache.org/licenses/LICENSE-2.0)

Downstream projects and end users may chose either license individually, or both together, at their discretion. The motivation for this dual-licensing is the additional software patent assurance provided by Apache 2.0.
