A community based topic aggregation platform built on atproto
bretton.dev
1package communities
2
3import (
4 "bytes"
5 "context"
6 "encoding/json"
7 "fmt"
8 "io"
9 "log"
10 "net/http"
11 "regexp"
12 "strings"
13 "time"
14)
15
16// Community handle validation regex (DNS-valid handle: name.communities.instance.com)
17// Matches standard DNS hostname format (RFC 1035)
18var communityHandleRegex = regexp.MustCompile(`^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$`)
19
20type communityService struct {
21 repo Repository
22 provisioner *PDSAccountProvisioner
23 pdsURL string
24 instanceDID string
25 instanceDomain string
26 pdsAccessToken string
27}
28
29// NewCommunityService creates a new community service
30func NewCommunityService(repo Repository, pdsURL, instanceDID, instanceDomain string, provisioner *PDSAccountProvisioner) Service {
31 return &communityService{
32 repo: repo,
33 pdsURL: pdsURL,
34 instanceDID: instanceDID,
35 instanceDomain: instanceDomain,
36 provisioner: provisioner,
37 }
38}
39
40// SetPDSAccessToken sets the PDS access token for authentication
41// This should be called after creating a session for the Coves instance DID on the PDS
42func (s *communityService) SetPDSAccessToken(token string) {
43 s.pdsAccessToken = token
44}
45
46// CreateCommunity creates a new community via write-forward to PDS
47// V2 Flow:
48// 1. Service creates PDS account for community (PDS generates signing keypair)
49// 2. Service writes community profile to COMMUNITY's own repository
50// 3. Firehose emits event
51// 4. Consumer indexes to AppView DB
52//
53// V2 Architecture:
54// - Community owns its own repository (at://community_did/social.coves.community.profile/self)
55// - PDS manages the signing keypair (we never see it)
56// - We store PDS credentials to act on behalf of the community
57// - Community can migrate to other instances (future V2.1 with rotation keys)
58func (s *communityService) CreateCommunity(ctx context.Context, req CreateCommunityRequest) (*Community, error) {
59 // Apply defaults before validation
60 if req.Visibility == "" {
61 req.Visibility = "public"
62 }
63
64 // Validate request
65 if err := s.validateCreateRequest(req); err != nil {
66 return nil, err
67 }
68
69 // V2: Provision a real PDS account for this community
70 // This calls com.atproto.server.createAccount internally
71 // The PDS will:
72 // 1. Generate a signing keypair (stored in PDS, we never see it)
73 // 2. Create a DID (did:plc:xxx)
74 // 3. Return credentials (DID, tokens)
75 pdsAccount, err := s.provisioner.ProvisionCommunityAccount(ctx, req.Name)
76 if err != nil {
77 return nil, fmt.Errorf("failed to provision PDS account for community: %w", err)
78 }
79
80 // Validate the atProto handle
81 if validateErr := s.ValidateHandle(pdsAccount.Handle); validateErr != nil {
82 return nil, fmt.Errorf("generated atProto handle is invalid: %w", validateErr)
83 }
84
85 // Build community profile record
86 profile := map[string]interface{}{
87 "$type": "social.coves.community.profile",
88 "handle": pdsAccount.Handle, // atProto handle (e.g., gaming.communities.coves.social)
89 "name": req.Name, // Short name for !mentions (e.g., "gaming")
90 "visibility": req.Visibility,
91 "hostedBy": s.instanceDID, // V2: Instance hosts, community owns
92 "createdBy": req.CreatedByDID,
93 "createdAt": time.Now().Format(time.RFC3339),
94 "federation": map[string]interface{}{
95 "allowExternalDiscovery": req.AllowExternalDiscovery,
96 },
97 }
98
99 // Add optional fields
100 if req.DisplayName != "" {
101 profile["displayName"] = req.DisplayName
102 }
103 if req.Description != "" {
104 profile["description"] = req.Description
105 }
106 if len(req.Rules) > 0 {
107 profile["rules"] = req.Rules
108 }
109 if len(req.Categories) > 0 {
110 profile["categories"] = req.Categories
111 }
112 if req.Language != "" {
113 profile["language"] = req.Language
114 }
115
116 // Initialize counts
117 profile["memberCount"] = 0
118 profile["subscriberCount"] = 0
119
120 // TODO: Handle avatar and banner blobs
121 // For now, we'll skip blob uploads. This would require:
122 // 1. Upload blob to PDS via com.atproto.repo.uploadBlob
123 // 2. Get blob ref (CID)
124 // 3. Add to profile record
125
126 // V2: Write to COMMUNITY's own repository (not instance repo!)
127 // Repository: at://COMMUNITY_DID/social.coves.community.profile/self
128 // Authenticate using community's access token
129 recordURI, recordCID, err := s.createRecordOnPDSAs(
130 ctx,
131 pdsAccount.DID, // repo = community's DID (community owns its repo!)
132 "social.coves.community.profile",
133 "self", // canonical rkey for profile
134 profile,
135 pdsAccount.AccessToken, // authenticate as the community
136 )
137 if err != nil {
138 return nil, fmt.Errorf("failed to create community profile record: %w", err)
139 }
140
141 // Build Community object with PDS credentials AND cryptographic keys
142 community := &Community{
143 DID: pdsAccount.DID, // Community's DID (owns the repo!)
144 Handle: pdsAccount.Handle, // atProto handle (e.g., gaming.communities.coves.social)
145 Name: req.Name,
146 DisplayName: req.DisplayName,
147 Description: req.Description,
148 OwnerDID: pdsAccount.DID, // V2: Community owns itself
149 CreatedByDID: req.CreatedByDID,
150 HostedByDID: req.HostedByDID,
151 PDSEmail: pdsAccount.Email,
152 PDSPassword: pdsAccount.Password,
153 PDSAccessToken: pdsAccount.AccessToken,
154 PDSRefreshToken: pdsAccount.RefreshToken,
155 PDSURL: pdsAccount.PDSURL,
156 Visibility: req.Visibility,
157 AllowExternalDiscovery: req.AllowExternalDiscovery,
158 MemberCount: 0,
159 SubscriberCount: 0,
160 CreatedAt: time.Now(),
161 UpdatedAt: time.Now(),
162 RecordURI: recordURI,
163 RecordCID: recordCID,
164 // V2: Cryptographic keys for portability (will be encrypted by repository)
165 RotationKeyPEM: pdsAccount.RotationKeyPEM, // CRITICAL: Enables DID migration
166 SigningKeyPEM: pdsAccount.SigningKeyPEM, // For atproto operations
167 }
168
169 // CRITICAL: Persist PDS credentials immediately to database
170 // The Jetstream consumer will eventually index the community profile from the firehose,
171 // but it won't have the PDS credentials. We must store them now so we can:
172 // 1. Update the community profile later (using its own credentials)
173 // 2. Re-authenticate if access tokens expire
174 _, err = s.repo.Create(ctx, community)
175 if err != nil {
176 return nil, fmt.Errorf("failed to persist community with credentials: %w", err)
177 }
178
179 return community, nil
180}
181
182// GetCommunity retrieves a community from AppView DB
183// identifier can be either a DID or handle
184func (s *communityService) GetCommunity(ctx context.Context, identifier string) (*Community, error) {
185 if identifier == "" {
186 return nil, ErrInvalidInput
187 }
188
189 // Determine if identifier is DID or handle
190 if strings.HasPrefix(identifier, "did:") {
191 return s.repo.GetByDID(ctx, identifier)
192 }
193
194 if strings.HasPrefix(identifier, "!") {
195 return s.repo.GetByHandle(ctx, identifier)
196 }
197
198 return nil, NewValidationError("identifier", "must be a DID or handle")
199}
200
201// UpdateCommunity updates a community via write-forward to PDS
202func (s *communityService) UpdateCommunity(ctx context.Context, req UpdateCommunityRequest) (*Community, error) {
203 if req.CommunityDID == "" {
204 return nil, NewValidationError("communityDid", "required")
205 }
206
207 if req.UpdatedByDID == "" {
208 return nil, NewValidationError("updatedByDid", "required")
209 }
210
211 // Get existing community
212 existing, err := s.repo.GetByDID(ctx, req.CommunityDID)
213 if err != nil {
214 return nil, err
215 }
216
217 // Authorization: verify user is the creator
218 // TODO(Communities-Auth): Add moderator check when moderation system is implemented
219 if existing.CreatedByDID != req.UpdatedByDID {
220 return nil, ErrUnauthorized
221 }
222
223 // Build updated profile record (start with existing)
224 profile := map[string]interface{}{
225 "$type": "social.coves.community.profile",
226 "handle": existing.Handle,
227 "name": existing.Name,
228 "owner": existing.OwnerDID,
229 "createdBy": existing.CreatedByDID,
230 "hostedBy": existing.HostedByDID,
231 "createdAt": existing.CreatedAt.Format(time.RFC3339),
232 }
233
234 // Apply updates
235 if req.DisplayName != nil {
236 profile["displayName"] = *req.DisplayName
237 } else {
238 profile["displayName"] = existing.DisplayName
239 }
240
241 if req.Description != nil {
242 profile["description"] = *req.Description
243 } else {
244 profile["description"] = existing.Description
245 }
246
247 if req.Visibility != nil {
248 profile["visibility"] = *req.Visibility
249 } else {
250 profile["visibility"] = existing.Visibility
251 }
252
253 if req.AllowExternalDiscovery != nil {
254 profile["federation"] = map[string]interface{}{
255 "allowExternalDiscovery": *req.AllowExternalDiscovery,
256 }
257 } else {
258 profile["federation"] = map[string]interface{}{
259 "allowExternalDiscovery": existing.AllowExternalDiscovery,
260 }
261 }
262
263 if req.ModerationType != nil {
264 profile["moderationType"] = *req.ModerationType
265 }
266
267 if len(req.ContentWarnings) > 0 {
268 profile["contentWarnings"] = req.ContentWarnings
269 }
270
271 // Preserve counts
272 profile["memberCount"] = existing.MemberCount
273 profile["subscriberCount"] = existing.SubscriberCount
274
275 // V2: Community profiles always use "self" as rkey
276 // (No need to extract from URI - it's always "self" for V2 communities)
277
278 // V2 CRITICAL FIX: Write-forward using COMMUNITY's own DID and credentials
279 // Repository: at://COMMUNITY_DID/social.coves.community.profile/self
280 // Authenticate as the community (not as instance!)
281 if existing.PDSAccessToken == "" {
282 return nil, fmt.Errorf("community %s missing PDS credentials - cannot update", existing.DID)
283 }
284
285 recordURI, recordCID, err := s.putRecordOnPDSAs(
286 ctx,
287 existing.DID, // repo = community's own DID (V2!)
288 "social.coves.community.profile",
289 "self", // V2: always "self"
290 profile,
291 existing.PDSAccessToken, // authenticate as the community
292 )
293 if err != nil {
294 return nil, fmt.Errorf("failed to update community on PDS: %w", err)
295 }
296
297 // Return updated community representation
298 // Actual AppView DB update happens via Jetstream consumer
299 updated := *existing
300 if req.DisplayName != nil {
301 updated.DisplayName = *req.DisplayName
302 }
303 if req.Description != nil {
304 updated.Description = *req.Description
305 }
306 if req.Visibility != nil {
307 updated.Visibility = *req.Visibility
308 }
309 if req.AllowExternalDiscovery != nil {
310 updated.AllowExternalDiscovery = *req.AllowExternalDiscovery
311 }
312 if req.ModerationType != nil {
313 updated.ModerationType = *req.ModerationType
314 }
315 if len(req.ContentWarnings) > 0 {
316 updated.ContentWarnings = req.ContentWarnings
317 }
318 updated.RecordURI = recordURI
319 updated.RecordCID = recordCID
320 updated.UpdatedAt = time.Now()
321
322 return &updated, nil
323}
324
325// ListCommunities queries AppView DB for communities with filters
326func (s *communityService) ListCommunities(ctx context.Context, req ListCommunitiesRequest) ([]*Community, int, error) {
327 // Set defaults
328 if req.Limit <= 0 || req.Limit > 100 {
329 req.Limit = 50
330 }
331
332 return s.repo.List(ctx, req)
333}
334
335// SearchCommunities performs fuzzy search in AppView DB
336func (s *communityService) SearchCommunities(ctx context.Context, req SearchCommunitiesRequest) ([]*Community, int, error) {
337 if req.Query == "" {
338 return nil, 0, NewValidationError("query", "search query is required")
339 }
340
341 // Set defaults
342 if req.Limit <= 0 || req.Limit > 100 {
343 req.Limit = 50
344 }
345
346 return s.repo.Search(ctx, req)
347}
348
349// SubscribeToCommunity creates a subscription via write-forward to PDS
350func (s *communityService) SubscribeToCommunity(ctx context.Context, userDID, communityIdentifier string) (*Subscription, error) {
351 if userDID == "" {
352 return nil, NewValidationError("userDid", "required")
353 }
354
355 // Resolve community identifier to DID
356 communityDID, err := s.ResolveCommunityIdentifier(ctx, communityIdentifier)
357 if err != nil {
358 return nil, err
359 }
360
361 // Verify community exists
362 community, err := s.repo.GetByDID(ctx, communityDID)
363 if err != nil {
364 return nil, err
365 }
366
367 // Check visibility - can't subscribe to private communities without invitation (TODO)
368 if community.Visibility == "private" {
369 return nil, ErrUnauthorized
370 }
371
372 // Build subscription record
373 subRecord := map[string]interface{}{
374 "$type": "social.coves.community.subscribe",
375 "community": communityDID,
376 }
377
378 // Write-forward: create subscription record in user's repo
379 recordURI, recordCID, err := s.createRecordOnPDS(ctx, userDID, "social.coves.community.subscribe", "", subRecord)
380 if err != nil {
381 return nil, fmt.Errorf("failed to create subscription on PDS: %w", err)
382 }
383
384 // Return subscription representation
385 subscription := &Subscription{
386 UserDID: userDID,
387 CommunityDID: communityDID,
388 SubscribedAt: time.Now(),
389 RecordURI: recordURI,
390 RecordCID: recordCID,
391 }
392
393 return subscription, nil
394}
395
396// UnsubscribeFromCommunity removes a subscription via PDS delete
397func (s *communityService) UnsubscribeFromCommunity(ctx context.Context, userDID, communityIdentifier string) error {
398 if userDID == "" {
399 return NewValidationError("userDid", "required")
400 }
401
402 // Resolve community identifier
403 communityDID, err := s.ResolveCommunityIdentifier(ctx, communityIdentifier)
404 if err != nil {
405 return err
406 }
407
408 // Get the subscription from AppView to find the record key
409 subscription, err := s.repo.GetSubscription(ctx, userDID, communityDID)
410 if err != nil {
411 return err
412 }
413
414 // Extract rkey from record URI (at://did/collection/rkey)
415 rkey := extractRKeyFromURI(subscription.RecordURI)
416 if rkey == "" {
417 return fmt.Errorf("invalid subscription record URI")
418 }
419
420 // Write-forward: delete record from PDS
421 if err := s.deleteRecordOnPDS(ctx, userDID, "social.coves.community.subscribe", rkey); err != nil {
422 return fmt.Errorf("failed to delete subscription on PDS: %w", err)
423 }
424
425 return nil
426}
427
428// GetUserSubscriptions queries AppView DB for user's subscriptions
429func (s *communityService) GetUserSubscriptions(ctx context.Context, userDID string, limit, offset int) ([]*Subscription, error) {
430 if limit <= 0 || limit > 100 {
431 limit = 50
432 }
433
434 return s.repo.ListSubscriptions(ctx, userDID, limit, offset)
435}
436
437// GetCommunitySubscribers queries AppView DB for community subscribers
438func (s *communityService) GetCommunitySubscribers(ctx context.Context, communityIdentifier string, limit, offset int) ([]*Subscription, error) {
439 communityDID, err := s.ResolveCommunityIdentifier(ctx, communityIdentifier)
440 if err != nil {
441 return nil, err
442 }
443
444 if limit <= 0 || limit > 100 {
445 limit = 50
446 }
447
448 return s.repo.ListSubscribers(ctx, communityDID, limit, offset)
449}
450
451// GetMembership retrieves membership info from AppView DB
452func (s *communityService) GetMembership(ctx context.Context, userDID, communityIdentifier string) (*Membership, error) {
453 communityDID, err := s.ResolveCommunityIdentifier(ctx, communityIdentifier)
454 if err != nil {
455 return nil, err
456 }
457
458 return s.repo.GetMembership(ctx, userDID, communityDID)
459}
460
461// ListCommunityMembers queries AppView DB for members
462func (s *communityService) ListCommunityMembers(ctx context.Context, communityIdentifier string, limit, offset int) ([]*Membership, error) {
463 communityDID, err := s.ResolveCommunityIdentifier(ctx, communityIdentifier)
464 if err != nil {
465 return nil, err
466 }
467
468 if limit <= 0 || limit > 100 {
469 limit = 50
470 }
471
472 return s.repo.ListMembers(ctx, communityDID, limit, offset)
473}
474
475// ValidateHandle checks if a community handle is valid
476func (s *communityService) ValidateHandle(handle string) error {
477 if handle == "" {
478 return NewValidationError("handle", "required")
479 }
480
481 if !communityHandleRegex.MatchString(handle) {
482 return ErrInvalidHandle
483 }
484
485 return nil
486}
487
488// ResolveCommunityIdentifier converts a handle or DID to a DID
489func (s *communityService) ResolveCommunityIdentifier(ctx context.Context, identifier string) (string, error) {
490 if identifier == "" {
491 return "", ErrInvalidInput
492 }
493
494 // If it's already a DID, return it
495 if strings.HasPrefix(identifier, "did:") {
496 return identifier, nil
497 }
498
499 // If it's a handle, look it up in AppView DB
500 if strings.HasPrefix(identifier, "!") {
501 community, err := s.repo.GetByHandle(ctx, identifier)
502 if err != nil {
503 return "", err
504 }
505 return community.DID, nil
506 }
507
508 return "", NewValidationError("identifier", "must be a DID or handle")
509}
510
511// Validation helpers
512
513func (s *communityService) validateCreateRequest(req CreateCommunityRequest) error {
514 if req.Name == "" {
515 return NewValidationError("name", "required")
516 }
517
518 // DNS label limit: 63 characters per label
519 // Community handle format: {name}.communities.{instanceDomain}
520 // The first label is just req.Name, so it must be <= 63 chars
521 if len(req.Name) > 63 {
522 return NewValidationError("name", "must be 63 characters or less (DNS label limit)")
523 }
524
525 // Name can only contain alphanumeric and hyphens
526 // Must start and end with alphanumeric (not hyphen)
527 nameRegex := regexp.MustCompile(`^[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$`)
528 if !nameRegex.MatchString(req.Name) {
529 return NewValidationError("name", "must contain only alphanumeric characters and hyphens")
530 }
531
532 if req.Description != "" && len(req.Description) > 3000 {
533 return NewValidationError("description", "must be 3000 characters or less")
534 }
535
536 // Visibility should already be set with default in CreateCommunity
537 if req.Visibility != "public" && req.Visibility != "unlisted" && req.Visibility != "private" {
538 return ErrInvalidVisibility
539 }
540
541 if req.CreatedByDID == "" {
542 return NewValidationError("createdByDid", "required")
543 }
544
545 if req.HostedByDID == "" {
546 return NewValidationError("hostedByDid", "required")
547 }
548
549 return nil
550}
551
552// PDS write-forward helpers
553
554func (s *communityService) createRecordOnPDS(ctx context.Context, repoDID, collection, rkey string, record map[string]interface{}) (string, string, error) {
555 endpoint := fmt.Sprintf("%s/xrpc/com.atproto.repo.createRecord", strings.TrimSuffix(s.pdsURL, "/"))
556
557 payload := map[string]interface{}{
558 "repo": repoDID,
559 "collection": collection,
560 "record": record,
561 }
562
563 if rkey != "" {
564 payload["rkey"] = rkey
565 }
566
567 return s.callPDS(ctx, "POST", endpoint, payload)
568}
569
570// createRecordOnPDSAs creates a record with a specific access token (for V2 community auth)
571func (s *communityService) createRecordOnPDSAs(ctx context.Context, repoDID, collection, rkey string, record map[string]interface{}, accessToken string) (string, string, error) {
572 endpoint := fmt.Sprintf("%s/xrpc/com.atproto.repo.createRecord", strings.TrimSuffix(s.pdsURL, "/"))
573
574 payload := map[string]interface{}{
575 "repo": repoDID,
576 "collection": collection,
577 "record": record,
578 }
579
580 if rkey != "" {
581 payload["rkey"] = rkey
582 }
583
584 return s.callPDSWithAuth(ctx, "POST", endpoint, payload, accessToken)
585}
586
587// putRecordOnPDSAs updates a record with a specific access token (for V2 community auth)
588func (s *communityService) putRecordOnPDSAs(ctx context.Context, repoDID, collection, rkey string, record map[string]interface{}, accessToken string) (string, string, error) {
589 endpoint := fmt.Sprintf("%s/xrpc/com.atproto.repo.putRecord", strings.TrimSuffix(s.pdsURL, "/"))
590
591 payload := map[string]interface{}{
592 "repo": repoDID,
593 "collection": collection,
594 "rkey": rkey,
595 "record": record,
596 }
597
598 return s.callPDSWithAuth(ctx, "POST", endpoint, payload, accessToken)
599}
600
601func (s *communityService) deleteRecordOnPDS(ctx context.Context, repoDID, collection, rkey string) error {
602 endpoint := fmt.Sprintf("%s/xrpc/com.atproto.repo.deleteRecord", strings.TrimSuffix(s.pdsURL, "/"))
603
604 payload := map[string]interface{}{
605 "repo": repoDID,
606 "collection": collection,
607 "rkey": rkey,
608 }
609
610 _, _, err := s.callPDS(ctx, "POST", endpoint, payload)
611 return err
612}
613
614func (s *communityService) callPDS(ctx context.Context, method, endpoint string, payload map[string]interface{}) (string, string, error) {
615 // Use instance's access token
616 return s.callPDSWithAuth(ctx, method, endpoint, payload, s.pdsAccessToken)
617}
618
619// callPDSWithAuth makes a PDS call with a specific access token (V2: for community authentication)
620func (s *communityService) callPDSWithAuth(ctx context.Context, method, endpoint string, payload map[string]interface{}, accessToken string) (string, string, error) {
621 jsonData, err := json.Marshal(payload)
622 if err != nil {
623 return "", "", fmt.Errorf("failed to marshal payload: %w", err)
624 }
625
626 req, err := http.NewRequestWithContext(ctx, method, endpoint, bytes.NewBuffer(jsonData))
627 if err != nil {
628 return "", "", fmt.Errorf("failed to create request: %w", err)
629 }
630 req.Header.Set("Content-Type", "application/json")
631
632 // Add authentication with provided access token
633 if accessToken != "" {
634 req.Header.Set("Authorization", "Bearer "+accessToken)
635 }
636
637 // Dynamic timeout based on operation type
638 // Write operations (createAccount, createRecord, putRecord) are slower due to:
639 // - Keypair generation
640 // - DID PLC registration
641 // - Database writes on PDS
642 timeout := 10 * time.Second // Default for read operations
643 if strings.Contains(endpoint, "createAccount") ||
644 strings.Contains(endpoint, "createRecord") ||
645 strings.Contains(endpoint, "putRecord") {
646 timeout = 30 * time.Second // Extended timeout for write operations
647 }
648
649 client := &http.Client{Timeout: timeout}
650 resp, err := client.Do(req)
651 if err != nil {
652 return "", "", fmt.Errorf("failed to call PDS: %w", err)
653 }
654 defer func() {
655 if closeErr := resp.Body.Close(); closeErr != nil {
656 log.Printf("Failed to close response body: %v", closeErr)
657 }
658 }()
659
660 body, err := io.ReadAll(resp.Body)
661 if err != nil {
662 return "", "", fmt.Errorf("failed to read response: %w", err)
663 }
664
665 if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
666 return "", "", fmt.Errorf("PDS returned status %d: %s", resp.StatusCode, string(body))
667 }
668
669 // Parse response to extract URI and CID
670 var result struct {
671 URI string `json:"uri"`
672 CID string `json:"cid"`
673 }
674 if err := json.Unmarshal(body, &result); err != nil {
675 // For delete operations, there might not be a response body
676 if method == "POST" && strings.Contains(endpoint, "deleteRecord") {
677 return "", "", nil
678 }
679 return "", "", fmt.Errorf("failed to parse PDS response: %w", err)
680 }
681
682 return result.URI, result.CID, nil
683}
684
685// Helper functions
686
687func extractRKeyFromURI(uri string) string {
688 // at://did/collection/rkey -> rkey
689 parts := strings.Split(uri, "/")
690 if len(parts) >= 4 {
691 return parts[len(parts)-1]
692 }
693 return ""
694}