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akwizgran deleted page: ForumApp

akwizgran
2015-04-20 09:18:38 +00:00
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ForumApp.markdown

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ForumApp is a [BSP application](BSP) that synchronises forum posts among groups of devices. Any subscriber to a forum can invite new subscribers, and any subscriber can post to the forum.
### Channel identifiers
All forums share a single invitation channel with the following random identifier:
`667e 2acb da80 2e61 3168 98f2 8ec5 8102 fcf2 3d10 04ee 3086 f5e9 94d8 30f5 b773`
Each forum also has its own channel with a [hash identifier](BSP#channel-identifiers). The application data structure for generating the identifier is a [BDF](BDF) list with two elements: `name` (string) and `salt` (raw). The random salt prevents collisions between forums with the same name.
The application identifer is random:
`859a 7be5 0dca 035b 64bd 6902 fb79 7097 795a f837 abbf 8c16 d750 b3c2 ccc1 86ea`
### Message types
**0: INVITATION** - The content is a BDF list with three elements: `forum` (list) and `note` (string, may be null). `forum` is a list with two elements, `name` and `salt`, as described above. `note` is an optional note from the inviter to the invitee.
**1: RESPONSE** - The content is a BDF list with three elements: `invitation_id` (raw), `decision` (boolean), and `note` (string, may be null). `invitation_id` is the identifier of an invitation created by the opposite peer. `decision` indicates whether the invitee wishes to subscribe. `note` is an optional note from the invitee to the inviter.
**2: DEPARTURE** - The content is a BDF list with one element: `invitation_id` (raw), which is the identifier of an invitation created by either peer.
**3: POST** - The content is a BDF list with two elements: `author` (list, may be null) and `content` (list). If `author` is null, the post is anonymous. Otherwise `author` is a list with two elements: `identity` (list) and `signature` (raw). `identity` is a list with two elements: `name` (string) and `public_key` (raw). `signature` is calculated over `content`.
`content` is a list with three elements: `parent_id` (raw, may be null), `body` (string), and `attachments` (dictionary, may be null). If `parent_id` is not null, it is the identifier of a post to which this is a response. Each key in `attachments` is the name of an attachment, and the value is a list with two elements: `mime_type` (string) and `message_id` (raw).
**4: ATTACHMENT** - The content is raw data.
### Validity policy
* An invitation or response must belong to the invitation channel.
* A post or attachment must belong to a forum channel.
* An invitation is valid if it is well-formed.
* A response is valid if it is well-formed and it references a valid invitation created by the opposite peer.
* A departure is valid if it is well-formed and it references a valid invitation created by either peer.
* A post is valid if it is well-formed, its parent (if any) is a valid post, and it is either anonymous or carries a valid signature over its content.
* An attachment is always valid.
Note that a post can be validated before its attachments have been received, and an attachment can be validated before it has been completely received.
### Storage policy
For the invitation channel:
* All local messages are stored.
* All remote messages are stored.
For forum channels:
* Local messages are stored while the local peer subscribes to the forum.
* Remote messages are stored while the local peer subscribes to the forum.
### Sharing policy
For the invitation channel:
* Each local message is shared with one remote peer.
* Each remote message is shared with the remote peer that created it.
For forum channels:
* Local messages are shared with all remote peers that subscribe to the forum.
* Remote messages are shared with all remote peers that subscribe to the forum.