Module projection 

Broadcast projection registry and key management.

A ProjectedContext tracks the per-epoch broadcast keys needed to decrypt messages from a broadcast context that this node projects over HTTP. The projection endpoints serve decrypted content at:

• GET /scp/broadcast/<routing_id_hex>/feed
• GET /scp/broadcast/<routing_id_hex>/messages/<blob_id_hex>

Where routing_id = SHA-256(context_id) per spec section 5.14.6.

Activation

Projection is opt-in per context via ApplicationNode::enable_broadcast_projection and deactivated via ApplicationNode::disable_broadcast_projection.

See spec sections 18.11.2 and 18.11.5.

Structs

FeedMessage

A single decrypted broadcast message in a FeedResponse.

FeedQuery

Query parameters for GET /scp/broadcast/<routing_id>/feed.

FeedResponse

JSON response body for GET /scp/broadcast/<routing_id>/feed.

ProjectedContext

A broadcast context whose messages are projected (decrypted and served) by this node’s HTTP endpoints.

Functions

broadcast_projection_router

Returns an axum Router serving both broadcast projection endpoints.

compute_routing_id

Computes the 32-byte routing ID for a broadcast context.

feed_handler

Axum handler for GET /scp/broadcast/<routing_id>/feed.

hex_decode

Decodes a hex string into a 32-byte array.

hex_encode

Encodes a 32-byte array as a lowercase hex string (64 characters).

message_handler

Axum handler for GET /scp/broadcast/<routing_id>/messages/<blob_id>.

unix_to_iso8601

Formats a Unix timestamp (seconds since epoch) as an ISO 8601 UTC string.

validate_projection_policy

Validates that a projection policy is consistent with the context’s admission mode.