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# Spacebar Activitypub
## Activitypub Specification
- [Activitystreams vocab](https://www.w3.org/TR/activitystreams-vocabulary)
- [Activitystreams](https://www.w3.org/TR/activitystreams-core)
- [Activitypub spec](https://www.w3.org/TR/activitypub/)
## Additional resources
- [Activitypub as it has been understood](https://flak.tedunangst.com/post/ActivityPub-as-it-has-been-understood)
- [Guide for new ActivityPub implementers](https://socialhub.activitypub.rocks/t/guide-for-new-activitypub-implementers/479)
- Understanding activitypub
[part 1](https://seb.jambor.dev/posts/understanding-activitypub/),
[part 2](https://seb.jambor.dev/posts/understanding-activitypub-part-2-lemmy/),
[part 3](https://seb.jambor.dev/posts/understanding-activitypub-part-3-the-state-of-mastodon/)
- [Nodejs Express Activitypub sample implementation](https://github.com/dariusk/express-activitypub)
- [Reading Activitypub](https://tinysubversions.com/notes/reading-activitypub/#the-ultimate-tl-dr)
# Spacebar Activitypub Docs
Incomplete documentation.
## Supported Types
| Spacebar object | Activitypub |
| --------------- | ---------------------------------------------------------------------------------- |
| Message | [Note](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-note) |
| Channel | [Group](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-group) |
| Guild | [Organisation](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-organization) |
| User | [Person](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-person) |
| Role | Spacebar extension: [Role](#role-federation) |
## Message Federation
A message sent by a user. Sent to channels, or directly to users (a DM channel is created on Spacebar instances).
### Supported Activities
| Activity | Action |
| ---------- | ---------------------------------------------------- |
| `Create` | Transformed from a Note to a Message and saved to db |
| `Delete` | Removes a message from db |
| `Update` | Updates a message and saves to db. |
| `Announce` | Used by Channels to forward to members. |
### Properties Used
| Property | Description |
| ---------------------- | ---------------------------------------------------------------------------- |
| `type` | Must be `"Note"` |
| `content` | Message content |
| `name` | Used as message content if `content` not provided |
| `inReplyTo` | Reference a previous Message in this guild |
| `published` | Timestamp of this Message |
| `attributedTo` | Message author |
| `to` | The Channel this Message is a part of |
| `tag` | Mentions |
| `tag[].type` | Must be `Mention` |
| `tag[].name` | Plain-type Webfinger address of a Profile within this Guild OR `@everyone` |
| `attachment` | Message attachments |
| `attachment[].url` | The URL of this media attachment |
| `attachment[].summary` | The content warning for this media attachment |
| `replies` | For compatibility with other software: The replies to this message |
| `sbType` | Spacebar extension. Describes the real MessageType. i.e. `GUILD_MEMBER_JOIN` |
| `embeds` | Spacebar extension. Describes the attached Embeds |
| `flags` | Spacebar extension. Message flags as bitfield |
| TODO: reactions | How does plemora/akkoma/misskey/etc handle reactions? |
| TODO: components | |
| TODO: stickers | |
## Channel Federation
An automated actor. Users can send messages to it, which the channel forwards to it's followers in an `Announce`.
Follows/is followed by it's corresponding Guild, if applicable.
### Supported Activities
| Activity | Action |
| -------------- | ----------------------------------------------------- |
| `Create` | Transformed from a Group to a Channel and saved to db |
| `Delete` | Removes a channel from db |
| `Update` | Updates channel details |
| `Add`/`Remove` | Manage pinned Messages for this Channel |
### Properties Used
| Property | Description |
| -------------- | --------------------------------------------------------------------- |
| `type` | Must be `"Group"` |
| `name` | The Channel name |
| `published` | Creation timestamp of this Channel |
| `attributedTo` | The Guild this Channel is a part of |
| `featured` | Mastodon extension. The pinned Messages in this Channel |
| `publicKey` | The public key used to verify signatures from this actor |
| `sbType` | Spacebar extension. Describes the real ChannelType. i.e. `GUILD_TEXT` |
## Guild Federation
An automated actor. Follows its Channels. Is followed by guild members.
Also contains a collection of [roles](#role-federation).
### Supported Activities
| Activity | Action |
| -------- | ------------------------------------------------------------------ |
| `Follow` | Join a guild. Must provide an invite code. Automatically accepted. |
| `Delete` | Delete a guild. |
| `Update` | Update guild details. |
### Properties Used
- attributed to is owner
## User Federation
A person. Sends messages to Channels. May also create, modify, or moderate guilds, channels, or roles.
Is a partOf a [Role](#role-federation)
### Supported Activities
| Activity | Action |
| ----------------- | ---------------------------------------------------------------------------------------------- |
| `Follow` | Send a friend request |
| `Accept`/`Reject` | Accept or reject a friend request |
| `Undo` | Unfriend |
| `Delete` | Delete a user from the database along with all their messages. |
| `Block` | Signal to the remote server that they should hide your profile from that user. Not guaranteed. |
| `Update` | Update user details. |
## Role Federation
Is a [Collection](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-collection) of Users within this role.
## S2S endpoints
Base url: `/federation`
- `/.well-known/webfinger?resource=acct@domain` - Returns webfinger response i.e. https://docs.joinmastodon.org/spec/webfinger/
- - Webfinger resources include users, channels, guilds, as well as invite codes which returns a the corresponding guild
- `/.well-known/host-meta` - Returns location of webfinger? Why is this neccessary?
- `/channels/:channel_id` - Returns specified Channel as AP object ( Group )
- `/channels/:channel_id/inbox` - The inbox for this Channel
- `/channels/:channel_id/outbox` - The outbox for this Channel
- `/channels/:channel_id/followers` - The Users that have access to this Channel
- `/channels/:channel_id/messages/:message_id` - Returns specified Message in Channel as AP object ( Announce Note )
-
- `/messages/:message_id` - Returns specified Message in Channel as AP object ( Announce Note )
- `/activities/:activity_id` - Returns the specified activitypub activity. E.g. Announce, Follow, etc.
- `/activities/inbox` - Shared inbox.
- `/users/:user_id` - Returns specified User as AP object (Person)
- `/users/:user_id/inbox` - The inbox of this User. POSTing creates a DM channel if it does not exist.
- `/guilds/:guild_id` - Returns specified Guild as AP object (Organisation)
## notes
- activitypub responses should be returned if the Accept header is `application/ld+json; profile="https://www.w3.org/ns/activitystreams"` OR `application/activity+json`
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