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 and is followed by it's corresponding Channels. Also contains a collection of roles.

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

User Federation

A person. Sends messages to Channels. May also create, modify, or moderate guilds, channels, or roles. Is a partOf a Role

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 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/
/.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