135 lines
3.9 KiB
Go
135 lines
3.9 KiB
Go
package federation
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import (
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"encoding/json"
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"fmt"
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"log"
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"strings"
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"time"
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"xorm.io/xorm"
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"github.com/forgeo/forgebucket/internal/models"
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)
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// Receive persists an inbound activity and dispatches it by type.
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// The caller is responsible for verifying the HTTP signature before calling this.
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func Receive(db *xorm.Engine, localActor *models.FederationActor, body []byte) error {
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var activity map[string]any
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if err := json.Unmarshal(body, &activity); err != nil {
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return fmt.Errorf("parse activity: %w", err)
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}
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actType, _ := activity["type"].(string)
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actorAPID, _ := activity["actor"].(string)
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entry := &models.FederationActivity{
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ActorAPID: localActor.APID,
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Type: actType,
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ObjectJSON: string(body),
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Direction: "inbound",
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RemoteActor: actorAPID,
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Published: time.Now().UTC(),
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}
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db.Insert(entry) //nolint:errcheck
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switch actType {
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case "Follow":
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return handleFollow(db, localActor, activity, actorAPID)
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case "Accept":
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handleAccept(db, localActor, activity)
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case "Undo":
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handleUndo(db, localActor, activity)
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case "Create":
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if IsCreatePullRequest(body) {
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// Derive instanceURL from the local actor's APID.
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instanceURL := extractInstanceURL(localActor.APID)
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if err := HandleCreatePullRequest(db, body, instanceURL); err != nil {
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log.Printf("federation: handle Create(PullRequest): %v", err)
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}
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} else {
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log.Printf("federation: received Create activity from %s (non-PR, skipped)", actorAPID)
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}
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default:
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log.Printf("federation: received unhandled activity type %q from %s", actType, actorAPID)
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}
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return nil
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}
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// handleFollow auto-accepts all incoming Follow activities and sends an Accept
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// back to the sender's inbox.
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func handleFollow(db *xorm.Engine, localActor *models.FederationActor, follow map[string]any, followerAPID string) error {
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if followerAPID == "" {
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return fmt.Errorf("Follow activity missing actor field")
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}
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// Fetch the follower's remote actor to get their inbox URL.
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remote, err := FetchActor(db, followerAPID)
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if err != nil {
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return fmt.Errorf("fetch follower actor: %w", err)
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}
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if remote.InboxURL == "" {
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return fmt.Errorf("follower has no inbox URL")
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}
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// Build Accept activity.
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accept := map[string]any{
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"@context": "https://www.w3.org/ns/activitystreams",
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"id": localActor.APID + "/activities/accept-" + fmt.Sprint(time.Now().UnixNano()),
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"type": "Accept",
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"actor": localActor.APID,
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"object": follow,
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}
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// Deliver asynchronously so inbox handler returns quickly.
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go func() {
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if err := DeliverActivity(localActor, accept, remote.InboxURL); err != nil {
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log.Printf("federation: deliver Accept to %s: %v", remote.InboxURL, err)
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return
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}
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// Store the outbound Accept.
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db.Insert(&models.FederationActivity{ //nolint:errcheck
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ActorAPID: localActor.APID,
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Type: "Accept",
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ObjectJSON: mustJSON(accept),
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Direction: "outbound",
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RemoteActor: followerAPID,
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Published: time.Now().UTC(),
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})
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log.Printf("federation: accepted Follow from %s", followerAPID)
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}()
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return nil
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}
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func handleAccept(db *xorm.Engine, localActor *models.FederationActor, activity map[string]any) {
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// A remote actor accepted our Follow. Nothing to store beyond the inbox entry.
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log.Printf("federation: received Accept for actor %s", localActor.APID)
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}
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func handleUndo(db *xorm.Engine, localActor *models.FederationActor, activity map[string]any) {
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// Common case: undo a Follow (unfollow).
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obj, _ := activity["object"].(map[string]any)
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if obj == nil {
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return
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}
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if t, _ := obj["type"].(string); t == "Follow" {
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log.Printf("federation: received Undo(Follow) for actor %s", localActor.APID)
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}
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}
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func mustJSON(v any) string {
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b, _ := json.Marshal(v)
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return string(b)
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}
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func extractInstanceURL(apid string) string {
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// apid is like "https://example.com/users/alice"
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// Return "https://example.com"
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parts := strings.SplitN(apid, "/", 4)
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if len(parts) >= 3 {
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return parts[0] + "//" + parts[2]
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}
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return apid
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}
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