ActivityPub Integration

How Cosmoslide uses ActivityPub to federate slide content.

What is ActivityPub?

ActivityPub is a W3C standard for decentralized social networking. Cosmoslide uses it to:

• Share slides across instances
• [TODO] Enable social interactions (likes, boosts, comments)
• Federate with other Fediverse platforms

Slides as ActivityPub Objects

Slides are represented as ActivityPub objects with a PDF attachment:

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Article",
  "id": "https://instance.example/slides/123",
  "name": "My Presentation Title",
  "content": "A description of the slide deck",
  "published": "2024-01-15T10:00:00Z",
  "attributedTo": "https://instance.example/users/alice",
  "attachment": [
    {
      "type": "Document",
      "mediaType": "application/pdf",
      "url": "https://instance.example/media/slides-123.pdf"
    }
  ]
}

Publishing Flow

1. User uploads PDF with metadata
2. System creates ActivityPub object with PDF attachment
3. Object wrapped in Create activity
4. Activity delivered to followers' inboxes

Social Interactions

Standard ActivityPub activities work with slides:

• [TODO] Like - Appreciation
• [TODO] Announce - Boost/reshare
• Note - Comments and replies

Compatibility

Cosmoslide works with other Fediverse platforms:

• Mastodon
• Pleroma
• Misskey
• Other ActivityPub-compliant software

Users on these platforms can view, like, boost, and comment on slides.