kopia lustrzana https://dev.funkwhale.audio/funkwhale/funkwhale
Merge branch 'funkwhale-activityPub-overview' into 'develop'
Draft add sporiff activitypub overview See merge request funkwhale/funkwhale!2638
petitminion
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Added basic ActivityPub overview
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@ -101,6 +101,7 @@ caption: Specifications
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hidden: true
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---
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specs/activitypub-overview/index
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specs/collections/index
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specs/nodeinfo21/index
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specs/offline-mode/index
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# ActivityPub overview
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## Actors
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Funkwhale uses [ActivityPub actors][actor-object] to hold and manage access to content. There are five main types of actor:
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Service actor
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: The **Service actor** is a special actor that represents a Funkwhale pod. ActivityPub actors can [follow this actor][follow-activity] to receive updates to public content stored on the pod.
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User
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: A **User** is an actor that represents **either** a person with a Funkwhale account **or** a _virtual_ user that controls access to a **Channel**. _Regular_ **Users** can own Funkwhale **Collection** actors to add content to their [ActivityPub Collection][collections].
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: _Regular_ **Users** may follow other **Users** to receive updates about the **User's** _Favorites_ ([likes collection](https://www.w3.org/TR/activitypub/#likes)) and _Listening activity_.
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: Multiple _regular_ **Users** can own a _virtual_ **User** to control access to a **Channel**. This is useful in the example of bands or groups who might share access to a joint account. A **User** may authenticate as the _virtual_ user to add content to a **Channel's**
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[ActivityPub Collection][collections].
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Collection
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: A **Collection** is an actor that represents a collection of content owned by a **User**. ActivityPub actors can [follow this actor][follow-activity] to be notified of changes to the collection's content.
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Channel
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: A **Channel** is an actor that represents a public stream of content owned by a _virtual_ **User**. Funkwhale **Users** with access to the _virtual_ **User** may manage content in the **Channel's** collection. ActivityPub actors can [follow this actor][follow-activity] to be notified of changes to the collection's content.
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Each actor must have a globally unique username that identifies them across federation. The `preferredUsername` field should be used to render the actor's name in all representations. Actor owners can change the `preferredUsername` of the actor at any time to update how it is represented.
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```{mermaid}
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erDiagram
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Pod ||--|| ServiceActor : contains
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Pod ||--|{ Users: contains
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Users ||--|{ Collections : owns
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Users }|--o{ VirtualUsers : accesses
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VirtualUsers ||--|{ Channels : owns
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Users }|--o{ Collections : follows
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Users }|--o{ Channels : follows
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Channels }|--|| ServiceActor : "public content"
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Collections }|--|| ServiceActor : "public content"
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ServiceActor ||--|| Outbox : publish
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```
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## Service actor outbox
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The **Service actor** publishes _public_ Funkwhale content to its [outbox][outbox]. When new content is added to a _public_ **Collection** or to a **Channel**, this update is added to the **Service actor's** outbox. Actors in the [followers collection][followers-collection] receive updates in their [inbox][inbox] and display the new content.
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Pods may follow one another's public content by having their **Service actor** follow the target pod's **Service actor**. If the target **Service actor** [accepts][accept-activity] the follow request, the requesting **Service actor** is added to the target **Service actor's** follower collection.
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```{mermaid}
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sequenceDiagram
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Pod A->>Pod B: Follow
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Pod B-->>Pod A: Accept
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loop New items are added to the outbox
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Pod B->>Pod A: New items
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end
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```
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**Service actors** publish the following to their outbox:
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- Addition of new public content (represented as [created actvities][create-inbox] against content objects)
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- Deletion of public content (represented as [delete activities][delete-activity] against content objects)
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- Changes to public content details (represented as [update activities][update-activity] against content objects)
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```{mermaid}
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sequenceDiagram
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User->>Service actor: Add new public content
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Service actor->>Outbox: Create content object
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Outbox->>Follower collection: Create content object
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User->>Service actor: Delete public content
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Service actor->>Outbox: Delete content object
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Outbox->>Follower collection: Delete content object
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User->>Service actor: Update public content
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Service actor->>Outbox: Update content object
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Outbox->>Follower collection: Update content object
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```
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## Regular user outbox
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**Regular** actors publish the following to their [outbox][outbox]:
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- Their favorites (represented as liked objects in their [likes collection][likes]
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- Their listens (represented as [created activities][create-inbox] against listening objects)
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### Favorite action
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```{mermaid}
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sequenceDiagram
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par
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User->>Funkwhale API: Favorite content
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User->>Outbox: Like content object
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end
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Outbox->>Follower collection: Like content object
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```
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### Listen action
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```{mermaid}
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sequenceDiagram
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par
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User->>Funkwhale API: Listen
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User->>Outbox: Create listen object
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end
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Outbox->>Follower collection: Create listen object
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```
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## Collection outbox
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**Collection** actors publish the following to their [outbox][outbox]:
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- Addition of new content (represented as [created activities][create-inbox] against content objects)
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- Deletion of content (represented as [delete activities][delete-activity] against content objects)
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- Changes to content details (represented as [update activities][update-activity] against content objects)
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```{mermaid}
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sequenceDiagram
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User->>Collection: Add new content
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Collection->>Outbox: Create content object
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Outbox->>Follower collection: Create content object
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User->>Collection: Delete content
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Collection->>Outbox: Delete content object
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Outbox->>Follower collection: Delete content object
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User->>Collection: Update content
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Collection->>Outbox: Update content object
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Outbox->>Follower collection: Update content object
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```
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## Channel outbox
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**Channel** actors publish the following to their [outbox][outbox]:
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- Addition of new content (represented as [created actvities][create-inbox] against content objects)
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- Deletion of content (represented as [delete activities][delete-activity] against content objects)
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- Changes to content details (represented as [update activities][update-activity] against content objects)
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```{mermaid}
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sequenceDiagram
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User->>Channel: Add new content
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Channel->>Outbox: Create content object
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Outbox->>Follower collection: Create content object
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User->>Channel: Delete content
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Channel->>Outbox: Delete content object
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Outbox->>Follower collection: Delete content object
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User->>Channel: Update content
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Channel->>Outbox: Update content object
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Outbox->>Follower collection: Update content object
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```
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[actor-object]: https://www.w3.org/TR/activitypub/#actor-objects
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[inbox]: https://www.w3.org/TR/activitypub/#inbox
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[outbox]: https://www.w3.org/TR/activitypub/#outbox
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[collections]: https://www.w3.org/TR/activitypub/#collections
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[followers-collection]: https://www.w3.org/TR/activitypub/#followers
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[create-inbox]: https://www.w3.org/TR/activitypub/#create-activity-inbox
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[likes]: https://www.w3.org/TR/activitypub/#likes
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[delete-activity]: https://www.w3.org/TR/activitypub/#delete-activity-inbox
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[update-activity]: https://www.w3.org/TR/activitypub/#update-activity-inbox
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[accept-activity]: https://www.w3.org/TR/activitypub/#accept-activity-inbox
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[follow-activity]: https://www.w3.org/TR/activitypub/#follow-activity-outbox
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