Update activitypub outline (#1183)
* Update activitypub outline * Various adjustments of apub outline
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# Activitypub API outline
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**This document is completely outdated and doesn't reflect the current state of Lemmy at all**
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This document is targeted at developers who are familiar with the ActivityPub and ActivityStreams protocols. It gives a detailed outline of the actors, objects and activities used by Lemmy.
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- Start with the [reddit API](https://www.reddit.com/dev/api), and find [Activitypub vocab](https://www.w3.org/TR/activitystreams-vocabulary/) to match it.
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Before reading this, have a look at our [Federation Overview](contributing_federation_overview.md) to get an idea how Lemmy federation works on a high level.
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Lemmy does not yet follow the ActivityPub spec in all regards. For example, we don't set a valid context indicating our context fields. We also ignore fields like `inbox`, `outbox` or `endpoints` for remote actors, and assume that everything is Lemmy. For an overview of deviations, read [#698](https://github.com/LemmyNet/lemmy/issues/698). They will be fixed in the near future.
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Lemmy is also really inflexible when it comes to incoming activities and objects. They need to be exactly identical to the examples below. Things like having an array instead of a single value, or an object ID instead of the full object will result in an error.
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In the following tables, "mandatory" refers to whether or not Lemmy will accept an incoming activity without this field. Lemmy itself will always include all non-empty fields.
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<!-- toc -->
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- [Actors](#actors)
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* [User / Person](#user--person)
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* [Community / Group](#community--group)
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* [Community](#community)
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* [User](#user)
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- [Objects](#objects)
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* [Post / Page](#post--page)
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* [Post Listings / Ordered CollectionPage](#post-listings--ordered-collectionpage)
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* [Comment / Note](#comment--note)
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* [Comment Listings / Ordered CollectionPage](#comment-listings--ordered-collectionpage)
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* [Deleted thing / Tombstone](#deleted-thing--tombstone)
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- [Actions](#actions)
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* [Comments](#comments)
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+ [Create](#create)
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+ [Delete](#delete)
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+ [Update](#update)
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+ [Read](#read)
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+ [Like](#like)
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+ [Dislike](#dislike)
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* [Posts](#posts)
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+ [Create](#create-1)
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+ [Delete](#delete-1)
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+ [Update](#update-1)
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+ [Read](#read-1)
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* [Communities](#communities)
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+ [Create](#create-2)
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+ [Delete](#delete-2)
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+ [Update](#update-2)
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+ [Join](#join)
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+ [Leave](#leave)
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* [Moderator](#moderator)
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+ [Ban user from community / Block](#ban-user-from-community--block)
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+ [Delete Comment](#delete-comment)
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+ [Invite a moderator](#invite-a-moderator)
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+ [Accept Invitation](#accept-invitation)
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+ [Reject Invitation](#reject-invitation)
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* [Post](#post)
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* [Comment](#comment)
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* [Private Message](#private-message)
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- [Activities](#activities)
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* [Follow](#follow)
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* [Accept Follow](#accept-follow)
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* [Unfollow](#unfollow)
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* [Create or Update Post](#create-or-update-post)
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* [Create or Update Comment](#create-or-update-comment)
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* [Like Post or Comment](#like-post-or-comment)
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* [Dislike Post or Comment](#dislike-post-or-comment)
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* [Delete Post or Comment](#delete-post-or-comment)
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* [Remove Post or Comment](#remove-post-or-comment)
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* [Undo](#undo)
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* [Announce](#announce)
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* [Create or Update Private message](#create-or-update-private-message)
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* [Delete Private Message](#delete-private-message)
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* [Undo Delete Private Message](#undo-delete-private-message)
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<!-- tocstop -->
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## Actors
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### [User / Person](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-person)
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```
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### Community
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An automated actor. Users can send posts or comments to it, which the community forwards to its followers in the form of `Announce`.
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Sends activities to user: `Accept/Follow`, `Announce`
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Receives activities from user: `Follow`, `Undo/Follow`, `Create`, `Update`, `Like`, `Dislike`, `Remove` (only admin/mod), `Delete` (only creator), `Undo` (only for own actions)
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```json
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Person",
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"id": "https://instance_url/api/v1/user/sally_smith",
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"inbox": "https://instance_url/api/v1/user/sally_smith/inbox",
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"outbox": "https://instance_url/api/v1/user/sally_smith/outbox",
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"liked": "https://instance_url/api/v1/user/sally_smith/liked",
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// TODO disliked?
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"following": "https://instance_url/api/v1/user/sally_smith/following",
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"name": "sally_smith",
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"preferredUsername": "Sally",
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"icon"?: {
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"type": "Image",
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"name": "User icon",
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"url": "https://instance_url/api/v1/user/sally_smith/icon.png",
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"width": 32,
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"height": 32
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"id": "https://enterprise.lemmy.ml/c/main",
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"type": "Group",
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"name": "main",
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"preferredUsername": "The Main Community",
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"category": {
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"identifier": "1",
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"name": "Discussion"
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},
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"published": "2014-12-31T23:00:00-08:00",
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"summary"?: "This is sally's profile."
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"sensitive": false,
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"attributedTo": [
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"https://enterprise.lemmy.ml/u/picard",
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"https://enterprise.lemmy.ml/u/riker"
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],
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"content": "Welcome to the default community!",
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"icon": {
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"type": "Image",
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"url": "https://enterprise.lemmy.ml/pictrs/image/Z8pFFb21cl.png"
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},
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"image": {
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"type": "Image",
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"url": "https://enterprise.lemmy.ml/pictrs/image/Wt8zoMcCmE.jpg"
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},
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"inbox": "https://enterprise.lemmy.ml/c/main/inbox",
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"outbox": "https://enterprise.lemmy.ml/c/main/outbox",
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"followers": "https://enterprise.lemmy.ml/c/main/followers",
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"endpoints": {
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"sharedInbox": "https://enterprise.lemmy.ml/inbox"
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},
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"published": "2020-10-06T17:27:43.282386+00:00",
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"updated": "2020-10-08T11:57:50.545821+00:00",
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"publicKey": {
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"id": "https://enterprise.lemmy.ml/c/main#main-key",
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"owner": "https://enterprise.lemmy.ml/c/main",
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"publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9JJ7Ybp/H7iXeLkWFepg\ny4PHyIXY1TO9rK3lIBmAjNnkNywyGXMgUiiVhGyN9yU7Km8aWayQsNHOkPL7wMZK\nnY2Q+CTQv49kprEdcDVPGABi6EbCSOcRFVaUjjvRHf9Olod2QP/9OtX0oIFKN2KN\nPIUjeKK5tw4EWB8N1i5HOuOjuTcl2BXSemCQLAlXerLjT8xCarGi21xHPaQvAuns\nHt8ye7fUZKPRT10kwDMapjQ9Tsd+9HeBvNa4SDjJX1ONskNh2j4bqHHs2WUymLpX\n1cgf2jmaXAsz6jD9u0wfrLPelPJog8RSuvOzDPrtwX6uyQOl5NK00RlBZwj7bMDx\nzwIDAQAB\n-----END PUBLIC KEY-----\n"
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}
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}
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```
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### [Community / Group](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-group)
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```
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| Field Name | Mandatory | Description |
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|---|---|---|
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| `name` | yes | Name of the actor |
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| `preferredUsername` | yes | Displayname |
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| `category` | yes | Hardcoded list of categories, see https://dev.lemmy.ml/api/v1/categories |
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| `sensitive` | yes | True indicates that all posts in the community are nsfw |
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| `attributedTo` | yes | First the community creator, then all the remaining moderators |
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| `content` | no | Text for the community sidebar, usually containing a description and rules |
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| `icon` | no | Icon, shown next to the community name |
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| `image` | no | Banner image, shown on top of the community page |
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| `inbox` | no | ActivityPub inbox URL |
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| `outbox` | no | ActivityPub outbox URL, only contains up to 20 latest posts, no comments, votes or other activities |
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| `followers` | no | Follower collection URL, only contains the number of followers, no references to individual followers |
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| `endpoints` | no | Contains URL of shared inbox |
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| `published` | no | Datetime when the community was first created |
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| `updated` | no | Datetime when the community was last changed |
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| `publicKey` | yes | The public key used to verify signatures from this actor |
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### User
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A person, interacts primarily with the community where it sends and receives posts/comments. Can also create and moderate communities, and send private messages to other users.
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Sends activities to Community: `Follow`, `Undo/Follow`, `Create`, `Update`, `Like`, `Dislike`, `Remove` (only admin/mod), `Delete` (only creator), `Undo` (only for own actions)
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Receives activities from Community: `Accept/Follow`, `Announce`
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Sends and receives activities from/to other users: `Create/Note`, `Update/Note`, `Delete/Note`, `Undo/Delete/Note` (all those related to private messages)
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```json
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Group",
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"id": "https://instance_url/api/v1/community/today_i_learned",
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"name": "today_i_learned"
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"attributedTo": [ // The moderators
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"http://joe.example.org",
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],
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"followers": "https://instance_url/api/v1/community/today_i_learned/followers",
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"published": "2014-12-31T23:00:00-08:00",
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"summary"?: "The group's tagline",
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"attachment: [{}] // TBD, these would be where strong types for custom styles, and images would work.
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"id": "https://enterprise.lemmy.ml/u/picard",
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"type": "Person",
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"name": "riker",
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"preferredUsername": "Jean-Luc Picard",
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"summary": "The user bio",
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"icon": {
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"type": "Image",
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"url": "https://enterprise.lemmy.ml/pictrs/image/DS3q0colRA.jpg"
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},
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"image": {
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"type": "Image",
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"url": "https://enterprise.lemmy.ml/pictrs/image/XenaYI5hTn.png"
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},
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"inbox": "https://enterprise.lemmy.ml/u/picard/inbox",
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"endpoints": {
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"sharedInbox": "https://enterprise.lemmy.ml/inbox"
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},
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"published": "2020-10-06T17:27:43.234391+00:00",
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"updated": "2020-10-08T11:27:17.905625+00:00",
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"publicKey": {
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"id": "https://enterprise.lemmy.ml/u/picard#main-key",
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"owner": "https://enterprise.lemmy.ml/u/picard",
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"publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyH9iH83+idw/T4QpuRSY\n5YgQ/T5pJCNxvQWb6qcCu3gEVigfbreqZKJpOih4YT36wu4GjPfoIkbWJXcfcEzq\nMEQoYbPStuwnklpN2zj3lRIPfGLht9CAlENLWikTUoW5kZLyU6UQtOGdT2b1hDuK\nsUEn67In6qYx6pal8fUbO6X3O2BKzGeofnXgHCu7QNIuH4RPzkWsLhvwqEJYP0zG\nodao2j+qmhKFsI4oNOUCGkdJejO7q+9gdoNxAtNNKilIOwUFBYXeZJb+XGlzo0X+\n70jdJ/xQCPlPlItU4pD/0FwPLtuReoOpMzLi20oDsPXJBvn+/NJaxqDINuywcN5p\n4wIDAQAB\n-----END PUBLIC KEY-----\n"
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}
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}
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```
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| Field Name | Mandatory | Description |
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|---|---|---|
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| `name` | yes | Name of the actor |
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| `preferredUsername` | no | Displayname |
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| `summary` | no | User bio |
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| `icon` | no | The user's avatar, shown next to the username |
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| `image` | no | The user's banner, shown on top of the profile |
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| `inbox` | no | ActivityPub inbox URL |
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| `endpoints` | no | Contains URL of shared inbox |
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| `published` | no | Datetime when the user signed up |
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| `updated` | no | Datetime when the user profile was last changed |
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| `publicKey` | yes | The public key used to verify signatures from this actor |
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## Objects
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### [Post / Page](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-page)
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```
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### Post
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A page with title, and optional URL and text content. The URL often leads to an image, in which case a thumbnail is included. Each post belongs to exactly one community.
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```json
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"id": "https://voyager.lemmy.ml/post/29",
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"type": "Page",
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"id": "https://instance_url/api/v1/post/1",
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"name": "The title of a post, maybe a link to imgur",
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"url": "https://news.blah.com"
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"attributedTo": "http://joe.example.org", // The poster
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"published": "2014-12-31T23:00:00-08:00",
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"attributedTo": "https://voyager.lemmy.ml/u/picard",
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"to": "https://voyager.lemmy.ml/c/main",
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"summary": "Test thumbnail 2",
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"content": "blub blub",
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"url": "https://voyager.lemmy.ml:/pictrs/image/fzGwCsq7BJ.jpg",
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"image": {
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"type": "Image",
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"url": "https://voyager.lemmy.ml/pictrs/image/UejwBqrJM2.jpg"
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},
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"commentsEnabled": true,
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"sensitive": false,
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"stickied": false,
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"published": "2020-09-24T17:42:50.396237+00:00",
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"updated": "2020-09-24T18:31:14.158618+00:00"
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}
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```
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### [Post Listings / Ordered CollectionPage](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-orderedcollectionpage)
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```
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "OrderedCollectionPage",
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"id": "https://instance_url/api/v1/posts?type={all, best, front}&sort={}&page=1,
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"partOf": "http://example.org/foo",
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"orderedItems": [Posts]
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}
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```
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| Field Name | Mandatory | Description |
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|---|---|---|
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| `attributedTo` | yes | ID of the user which created this post |
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| `to` | yes | ID of the community where it was posted to |
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| `summary` | yes | Title of the post |
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| `content` | no | Body of the post |
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| `url` | no | An arbitrary link to be shared |
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| `image` | no | Thumbnail for `url`, only present if it is an image link |
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| `commentsEnabled` | yes | False indicates that the post is locked, and no comments can be added |
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| `sensitive` | yes | True marks the post as NSFW, blurs the thumbnail and hides it from users with NSFW settign disabled |
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| `stickied` | yes | True means that it is shown on top of the community |
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| `published` | no | Datetime when the post was created |
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| `updated` | no | Datetime when the post was edited (not present if it was never edited) |
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### [Comment / Note](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-note)
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```
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### Comment
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A reply to a post, or reply to another comment. Contains only text (including references to other users or communities). Lemmy displays comments in a tree structure.
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```json
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"id": "https://enterprise.lemmy.ml/comment/95",
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"type": "Note",
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"id": "https://instance_url/api/v1/comment/1",
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"mediaType": "text/markdown",
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"content": "Looks like it is going to rain today. Bring an umbrella *if necessary*!"
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"attributedTo": john_id,
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"inReplyTo": "comment or post id",
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"published": "2014-12-31T23:00:00-08:00",
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"updated"?: "2014-12-12T12:12:12Z"
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"replies" // TODO, not sure if these objects should embed all replies in them or not.
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"to": [sally_id, group_id]
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}
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```
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### [Comment Listings / Ordered CollectionPage](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-orderedcollectionpage)
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```
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "OrderedCollectionPage",
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"id": "https://instance_url/api/v1/comments?type={all,user,community,post,parent_comment}&id=1&page=1,
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"partOf": "http://example.org/foo",
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"orderedItems": [Comments]
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}
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```
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### [Deleted thing / Tombstone](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-tombstone)
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```
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{
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"type": "Tombstone",
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"formerType": "Note / Post",
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"id": note / post_id,
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"deleted": "2016-03-17T00:00:00Z"
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}
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```
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## Actions
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- These are all posts to a user's outbox.
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- The server then creates a post to the necessary inbox of the recipient, or the followers.
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- Whenever a user accesses the site, they do a get from their inbox.
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### Comments
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#### [Create](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-create)
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```
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{
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Create",
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"actor": id,
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"object": comment_id, or post_id
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}
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```
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#### [Delete](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-delete)
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```
|
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{
|
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Delete",
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"actor": id,
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"object": comment_id, or post_id
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}
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```
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#### [Update](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-update)
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```
|
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{
|
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Create",
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||||
"actor": id,
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"object": comment_id, or post_id
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"content": "New comment",
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"updated": "New Date"
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||||
}
|
||||
```
|
||||
#### [Read](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-read)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Read",
|
||||
"actor": user_id
|
||||
"object": comment_id
|
||||
"attributedTo": "https://enterprise.lemmy.ml/u/picard",
|
||||
"to": "https://enterprise.lemmy.ml/c/main",
|
||||
"content": "mmmk",
|
||||
"inReplyTo": [
|
||||
"https://enterprise.lemmy.ml/post/38",
|
||||
"https://voyager.lemmy.ml/comment/73"
|
||||
],
|
||||
"published": "2020-10-06T17:53:22.174836+00:00",
|
||||
"updated": "2020-10-06T17:53:22.174836+00:00"
|
||||
}
|
||||
```
|
||||
|
||||
#### [Like](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-like)
|
||||
- TODO: Should likes be notifications? IE, have a to?
|
||||
```
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `attributedTo` | yes | ID of the user who created the comment |
|
||||
| `to` | yes | Community where the comment was made |
|
||||
| `content` | yes | The comment text |
|
||||
| `inReplyTo` | yes | IDs of the post where this comment was made, and the parent comment. If this is a top-level comment, `inReplyTo` only contains the post |
|
||||
| `published` | no | Datetime when the comment was created |
|
||||
| `updated` | no | Datetime when the comment was edited (not present if it was never edited) |
|
||||
|
||||
### Private Message
|
||||
|
||||
A direct message from one user to another. Can not include additional users. Threading is not implemented yet, so the `inReplyTo` field is missing.
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Like",
|
||||
"actor": user_id
|
||||
"object": comment_id
|
||||
// TODO different types of reactions, or no?
|
||||
}
|
||||
```
|
||||
#### [Dislike](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-dislike)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Dislike",
|
||||
"actor": user_id
|
||||
"object": comment_id
|
||||
// TODO different types of reactions, or no?
|
||||
"id": "https://enterprise.lemmy.ml/private_message/34",
|
||||
"type": "Note",
|
||||
"attributedTo": "https://enterprise.lemmy.ml/u/picard",
|
||||
"to": "https://voyager.lemmy.ml/u/janeway",
|
||||
"content": "test",
|
||||
"published": "2020-10-08T19:10:46.542820+00:00",
|
||||
"updated": "2020-10-08T20:13:52.547156+00:00"
|
||||
}
|
||||
```
|
||||
|
||||
### Posts
|
||||
#### [Create](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-create)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Create",
|
||||
"actor": id,
|
||||
"to": community_id/followers
|
||||
"object": post_id
|
||||
}
|
||||
```
|
||||
#### [Delete](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-delete)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Delete",
|
||||
"actor": id,
|
||||
"object": comment_id, or post_id
|
||||
}
|
||||
```
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `attributedTo` | ID of the user who created this private message |
|
||||
| `to` | ID of the recipient |
|
||||
| `content` | yes | The text of the private message |
|
||||
| `published` | no | Datetime when the message was created |
|
||||
| `updated` | no | Datetime when the message was edited (not present if it was never edited) |
|
||||
|
||||
#### [Update](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-update)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Create",
|
||||
"actor": id,
|
||||
"object": comment_id, or post_id
|
||||
TODO fields.
|
||||
}
|
||||
```
|
||||
#### [Read](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-read)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Read",
|
||||
"actor": user_id
|
||||
"object": post_id
|
||||
}
|
||||
```
|
||||
## Activities
|
||||
|
||||
### Communities
|
||||
#### [Create](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-create)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Create",
|
||||
"actor": id,
|
||||
"object": community_id
|
||||
}
|
||||
```
|
||||
#### [Delete](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-delete)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Delete",
|
||||
"actor": id,
|
||||
"object": community_id
|
||||
}
|
||||
```
|
||||
### Follow
|
||||
|
||||
#### [Update](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-update)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Create",
|
||||
"actor": id,
|
||||
"object": community_id
|
||||
TODO fields.
|
||||
}
|
||||
```
|
||||
When the user clicks "Subscribe" in a community, a `Follow` is sent. The community automatically responds with an `Accept/Follow`.
|
||||
|
||||
#### [Follow / Subscribe](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-follow)
|
||||
```
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://enterprise.lemmy.ml/activities/follow/2e4784b7-4edf-4fa1-a352-674d5d5f8891",
|
||||
"type": "Follow",
|
||||
"actor": id
|
||||
"object": community_id
|
||||
"actor": "https://enterprise.lemmy.ml/u/picard",
|
||||
"to": "https://ds9.lemmy.ml/c/main",
|
||||
"object": "https://ds9.lemmy.ml/c/main"
|
||||
}
|
||||
```
|
||||
|
||||
#### [Ignore/ Unsubscribe](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-ignore)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Follow",
|
||||
"actor": id
|
||||
"object": community_id
|
||||
}
|
||||
```
|
||||
#### [Join / Become a Mod](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-join)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Join",
|
||||
"actor": user_id,
|
||||
"object": community_id
|
||||
}
|
||||
```
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `actor` | yes | The user that is sending the follow request |
|
||||
| `object` | yes | The community to be followed |
|
||||
|
||||
#### [Leave](https://www.w3.org/TR/activitystreams-vocabulary#dfn-leave)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Leave",
|
||||
"actor": user_id,
|
||||
"object": community_id
|
||||
}
|
||||
```
|
||||
### Accept Follow
|
||||
|
||||
### Moderator
|
||||
#### [Ban user from community / Block](https://www.w3.org/TR/activitystreams-vocabulary#dfn-block)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Remove",
|
||||
"actor": mod_id,
|
||||
"object": user_id,
|
||||
"origin": group_id
|
||||
}
|
||||
```
|
||||
Automatically sent by the community in response to a `Follow`. At the same time, the community adds this user to its followers list.
|
||||
|
||||
#### [Delete Comment](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-delete)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Delete",
|
||||
"actor": id,
|
||||
"object": community_id
|
||||
}
|
||||
```
|
||||
Sent by: Community
|
||||
|
||||
#### [Invite a moderator](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-invite)
|
||||
```
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Invite",
|
||||
"id": "https://instance_url/api/v1/invite/1",
|
||||
"actor": sally_id,
|
||||
"object": group_id,
|
||||
"target": john_id
|
||||
}
|
||||
```
|
||||
#### [Accept Invitation](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-accept)
|
||||
```
|
||||
Sent to: User
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/accept/5314bf7c-dab8-4b01-baf2-9be11a6a812e",
|
||||
"type": "Accept",
|
||||
"actor": john_id,
|
||||
"object": invite_id
|
||||
}
|
||||
```
|
||||
#### [Reject Invitation](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-reject)
|
||||
```
|
||||
{
|
||||
"actor": "https://ds9.lemmy.ml/c/main",
|
||||
"to": "https://enterprise.lemmy.ml/u/picard",
|
||||
"object": {
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"type": "Reject",
|
||||
"actor": john_id,
|
||||
"object": invite_id
|
||||
"id": "https://enterprise.lemmy.ml/activities/follow/2e4784b7-4edf-4fa1-a352-674d5d5f8891",
|
||||
"type": "Follow",
|
||||
"object": "https://ds9.lemmy.ml/c/main",
|
||||
"actor": "https://enterprise.lemmy.ml/u/picard"
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `actor` | yes | The same community as in the `Follow` activity |
|
||||
| `to` | no | ID of the user which sent the `Follow` |
|
||||
| `object` | yes | The previously sent `Follow` activity |
|
||||
|
||||
### Unfollow
|
||||
|
||||
Clicking on the unsubscribe button in a community causes an `Undo/Follow` to be sent. The community removes the user from its follower list after receiving it.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "http://lemmy-alpha:8541/activities/undo/2c624a77-a003-4ed7-91cb-d502eb01b8e8",
|
||||
"type": "Undo",
|
||||
"actor": "http://lemmy-alpha:8541/u/lemmy_alpha",
|
||||
"to": "http://lemmy-beta:8551/c/main",
|
||||
"object": {
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "http://lemmy-alpha:8541/activities/follow/f0d732e7-b1e7-4857-a5e0-9dc83c3f7ee8",
|
||||
"type": "Follow",
|
||||
"actor": "http://lemmy-alpha:8541/u/lemmy_alpha",
|
||||
"object": "http://lemmy-beta:8551/c/main"
|
||||
}
|
||||
}
|
||||
```
|
||||
### Create or Update Post
|
||||
|
||||
When a user creates a new post, it is sent to the respective community. Editing a previously created post sends an almost identical activity, except the `type` being `Update`. We don't support mentions in posts yet.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://enterprise.lemmy.ml/activities/create/6e11174f-501a-4531-ac03-818739bfd07d",
|
||||
"type": "Create",
|
||||
"actor": "https://enterprise.lemmy.ml/u/riker",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/"
|
||||
],
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `type` | yes | either `Create` or `Update` |
|
||||
| `cc` | yes | Community where the post is being made |
|
||||
| `object` | yes | The post being created |
|
||||
|
||||
### Create or Update Comment
|
||||
|
||||
A reply to a post, or to another comment. Can contain mentions of other users. Editing a previously created post sends an almost identical activity, except the `type` being `Update`.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://enterprise.lemmy.ml/activities/create/6f52d685-489d-4989-a988-4faedaed1a70",
|
||||
"type": "Create",
|
||||
"actor": "https://enterprise.lemmy.ml/u/riker",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"tag": [{
|
||||
"type": "Mention",
|
||||
"name": "@sisko@ds9.lemmy.ml",
|
||||
"href": "https://ds9.lemmy.ml/u/sisko"
|
||||
}],
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/",
|
||||
"https://ds9.lemmy.ml/u/sisko"
|
||||
],
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `tag` | no | List of users which are mentioned in the comment (like `@user@example.com`) |
|
||||
| `cc` | yes | Community where the post is being made, as well as any mentioned users |
|
||||
| `object` | yes | The comment being created |
|
||||
|
||||
### Like Post or Comment
|
||||
|
||||
An upvote for a post or comment.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://enterprise.lemmy.ml/activities/like/8f3f48dd-587d-4624-af3d-59605b7abad3",
|
||||
"type": "Like",
|
||||
"actor": "https://enterprise.lemmy.ml/u/riker",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/"
|
||||
],
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `cc` | yes | ID of the community where the post/comment is |
|
||||
| `object` | yes | The post or comment being upvoted |
|
||||
|
||||
### Dislike Post or Comment
|
||||
|
||||
A downvote for a post or comment.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://enterprise.lemmy.ml/activities/dislike/fd2b8e1d-719d-4269-bf6b-2cadeebba849",
|
||||
"type": "Dislike",
|
||||
"actor": "https://enterprise.lemmy.ml/u/riker",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/"
|
||||
],
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `cc` | yes | ID of the community where the post/comment is |
|
||||
| `object` | yes | The post or comment being upvoted |
|
||||
|
||||
### Delete Post or Comment
|
||||
|
||||
Deletes a previously created post or comment. This can only be done by the original creator of that post/comment.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://enterprise.lemmy.ml/activities/delete/f1b5d57c-80f8-4e03-a615-688d552e946c",
|
||||
"type": "Delete",
|
||||
"actor": "https://enterprise.lemmy.ml/u/riker",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://enterprise.lemmy.ml/c/main/"
|
||||
],
|
||||
"object": "https://enterprise.lemmy.ml/post/32"
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `cc` | yes | ID of the community where the post/comment is |
|
||||
| `object` | yes | ID of the post or comment being deleted |
|
||||
|
||||
### Remove Post or Comment
|
||||
|
||||
Removes a post or comment. This can only be done by a community mod, or by an admin on the instance where the community is hosted.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/remove/aab93b8e-3688-4ea3-8212-d00d29519218",
|
||||
"type": "Remove",
|
||||
"actor": "https://ds9.lemmy.ml/u/sisko",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/"
|
||||
],
|
||||
"object": "https://enterprise.lemmy.ml/comment/32"
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `cc` | yes | ID of the community where the post/comment is |
|
||||
| `object` | yes | ID of the post or comment being removed |
|
||||
|
||||
### Undo
|
||||
|
||||
Reverts a previous activity, can only be done by the `actor` of `object`. In case of a `Like` or `Dislike`, the vote count is changed back. In case of a `Delete` or `Remove`, the post/comment is restored. The `object` is regenerated from scratch, as such the activity ID and other fields are different.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: Community
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/undo/70ca5fb2-e280-4fd0-a593-334b7f8a5916",
|
||||
"type": "Undo",
|
||||
"actor": "https://ds9.lemmy.ml/u/sisko",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/"
|
||||
],
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `object` | yes | Any `Like`, `Dislike`, `Delete` or `Remove` activity as described above |
|
||||
|
||||
### Announce
|
||||
|
||||
When the community receives a post or comment activity, it wraps that into an `Announce` and sends it to all followers.
|
||||
|
||||
Sent by: Community
|
||||
|
||||
Sent to: User
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/announce/b98382e8-6cb1-469e-aa1f-65c5d2c31cc4",
|
||||
"type": "Announce",
|
||||
"actor": "https://ds9.lemmy.ml/c/main",
|
||||
"to": "https://www.w3.org/ns/activitystreams#Public",
|
||||
"cc": [
|
||||
"https://ds9.lemmy.ml/c/main/followers"
|
||||
],
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `object` | yes | Any `Create`, `Update`, `Like`, `Dislike`, `Delete` `Remove` or `Undo` activity as described above |
|
||||
|
||||
### Create or Update Private message
|
||||
|
||||
Creates a new private message between two users.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: User
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/create/202daf0a-1489-45df-8d2e-c8a3173fed36",
|
||||
"type": "Create",
|
||||
"actor": "https://ds9.lemmy.ml/u/sisko",
|
||||
"to": "https://enterprise.lemmy.ml/u/riker/inbox",
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
||||
| Field Name | Mandatory | Description |
|
||||
|---|---|---|
|
||||
| `type` | yes | Either `Create` or `Update` |
|
||||
|
||||
### Delete Private Message
|
||||
|
||||
Deletes a previous private message.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: User
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/delete/2de5a5f3-bf26-4949-a7f5-bf52edfca909",
|
||||
"type": "Delete",
|
||||
"actor": "https://ds9.lemmy.ml/u/sisko",
|
||||
"to": "https://enterprise.lemmy.ml/u/riker/inbox",
|
||||
"object": "https://enterprise.lemmy.ml/private_message/341"
|
||||
}
|
||||
```
|
||||
|
||||
### Undo Delete Private Message
|
||||
|
||||
Restores a previously deleted private message. The `object` is regenerated from scratch, as such the activity ID and other fields are different.
|
||||
|
||||
Sent by: User
|
||||
|
||||
Sent to: User
|
||||
|
||||
```json
|
||||
{
|
||||
"@context": "https://www.w3.org/ns/activitystreams",
|
||||
"id": "https://ds9.lemmy.ml/activities/undo/b24bc56d-5db1-41dd-be06-3f1db8757842",
|
||||
"type": "Undo",
|
||||
"actor": "https://ds9.lemmy.ml/u/sisko",
|
||||
"to": "https://enterprise.lemmy.ml/u/riker/inbox",
|
||||
"object": ...
|
||||
}
|
||||
```
|
||||
|
|
@ -1,7 +1,7 @@
|
|||
# Federation
|
||||
|
||||
|
||||
This document is targeted at people that are more or less familiar with ActivityStreams and ActivityPub protocols. It is meant provide a high-level overview of ActivityPub federation in Lemmy. If you are implementing ActivityPub yourself and want to be compatible with Lemmy, read our [ActivityPub API outline](contributing_apub_api_outline.md).
|
||||
This document is for anyone who wants to know how Lemmy federation works, without being overly technical. It is meant provide a high-level overview of ActivityPub federation in Lemmy. If you are implementing ActivityPub yourself and want to be compatible with Lemmy, read our [ActivityPub API outline](contributing_apub_api_outline.md).
|
||||
|
||||
## Documentation conventions
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue