| 1 | package community |
| 2 | |
| 3 | // Agent grant requests are deliberately ordinary NIP-22 comments. The |
| 4 | // request describes a narrow change to the current grant; the operator's |
| 5 | // signed 30392 replacement remains the authority. |
| 6 | |
| 7 | import ( |
| 8 | "context" |
| 9 | "database/sql" |
| 10 | "encoding/json" |
| 11 | "errors" |
| 12 | "fmt" |
| 13 | "io" |
| 14 | "reflect" |
| 15 | "slices" |
| 16 | "strings" |
| 17 | "unicode/utf8" |
| 18 | |
| 19 | "github.com/FelineStateMachine/tinyrelay/internal/event" |
| 20 | ) |
| 21 | |
| 22 | const agentGrantReasonMax = 500 |
| 23 | |
| 24 | type grantRequestReader interface { |
| 25 | QueryRowContext(context.Context, string, ...any) *sql.Row |
| 26 | QueryContext(context.Context, string, ...any) (*sql.Rows, error) |
| 27 | } |
| 28 | |
| 29 | func grantRequestOpen(ctx context.Context, db grantRequestReader, request event.Event, now int64) error { |
| 30 | if expires := event.Expiration(request); expires != 0 && expires <= now { |
| 31 | return errors.New("conflict: grant request has expired" ) |
| 32 | } |
| 33 | rows, err := db.QueryContext(ctx, `SELECT json_extract(raw,'$.content') FROM events AS reaction |
| 34 | WHERE kind=7 AND pubkey=? AND (expires=0 OR expires>?) AND EXISTS( |
| 35 | SELECT 1 FROM tags WHERE event_id=reaction.id AND name='e' AND value=?)`, event.Tag(request, "p"), now, request.ID) |
| 36 | if err != nil { |
| 37 | return err |
| 38 | } |
| 39 | defer rows.Close() |
| 40 | for rows.Next() { |
| 41 | var content string |
| 42 | if err := rows.Scan(&content); err != nil { |
| 43 | return err |
| 44 | } |
| 45 | if strings.TrimSpace(content) == "-" { |
| 46 | return errors.New("conflict: grant request was denied" ) |
| 47 | } |
| 48 | } |
| 49 | return rows.Err() |
| 50 | } |
| 51 | |
| 52 | type AgentGrantChanges struct { |
| 53 | Kinds []int `json:"kinds,omitempty"` |
| 54 | Rooms []string `json:"rooms,omitempty"` |
| 55 | Repos []AgentRepo `json:"repos,omitempty"` |
| 56 | Sites []AgentSite `json:"sites,omitempty"` |
| 57 | Wiki *string `json:"wiki,omitempty"` |
| 58 | Jobs *string `json:"jobs,omitempty"` |
| 59 | Rate *int `json:"rate,omitempty"` |
| 60 | } |
| 61 | |
| 62 | type AgentGrantRequest struct { |
| 63 | Base string `json:"base"` |
| 64 | Changes AgentGrantChanges `json:"changes"` |
| 65 | } |
| 66 | |
| 67 | type AgentGrantReview struct { |
| 68 | RequestID string `json:"request_id"` |
| 69 | Base string `json:"base"` |
| 70 | Agent string `json:"agent"` |
| 71 | Operator string `json:"operator"` |
| 72 | Before AgentGrant `json:"before"` |
| 73 | After AgentGrant `json:"after"` |
| 74 | Unsigned event.Event `json:"unsigned"` |
| 75 | } |
| 76 | |
| 77 | func IsAgentGrantRequest(e event.Event) bool { |
| 78 | return e.Kind == 1111 && event.Tag(e, "request" ) == "grant" |
| 79 | } |
| 80 | |
| 81 | func decodeGrantRequest(e event.Event) (AgentGrantRequest, error) { |
| 82 | if !IsAgentGrantRequest(e) { |
| 83 | return AgentGrantRequest{}, errors.New("invalid: not an agent grant request" ) |
| 84 | } |
| 85 | if strings.TrimSpace(e.Content) == "" || len([]rune(e.Content)) > agentGrantReasonMax { |
| 86 | return AgentGrantRequest{}, fmt.Errorf("invalid: grant request rationale must be 1 to %d characters" , agentGrantReasonMax) |
| 87 | } |
| 88 | if !utf8.ValidString(e.Content) { |
| 89 | return AgentGrantRequest{}, errors.New("invalid: grant request rationale is not valid UTF-8" ) |
| 90 | } |
| 91 | var req AgentGrantRequest |
| 92 | dec := json.NewDecoder(strings.NewReader(event.Tag(e, "grant" ))) |
| 93 | dec.DisallowUnknownFields() |
| 94 | if err := dec.Decode(&req); err != nil || req.Base == "" { |
| 95 | return AgentGrantRequest{}, errors.New("invalid: grant request needs a base and changes" ) |
| 96 | } |
| 97 | var extra any |
| 98 | if err := dec.Decode(&extra); err != io.EOF { |
| 99 | return AgentGrantRequest{}, errors.New("invalid: grant request JSON has trailing data" ) |
| 100 | } |
| 101 | allowed := map[string]bool{"request" : true, "grant" : true, "E" : true, "K" : true, "P" : true, "e" : true, "k" : true, "p" : true, "subject" : true, "expiration" : true} |
| 102 | seen := map[string]bool{} |
| 103 | for _, tag := range e.Tags { |
| 104 | if len(tag) == 0 || !allowed[tag[0]] { |
| 105 | return AgentGrantRequest{}, errors.New("invalid: grant request contains an unsupported tag" ) |
| 106 | } |
| 107 | if seen[tag[0]] { |
| 108 | return AgentGrantRequest{}, errors.New("invalid: grant request contains duplicate tags" ) |
| 109 | } |
| 110 | seen[tag[0]] = true |
| 111 | } |
| 112 | if req.Changes.Kinds == nil && req.Changes.Rooms == nil && req.Changes.Repos == nil && req.Changes.Sites == nil && req.Changes.Wiki == nil && req.Changes.Jobs == nil && req.Changes.Rate == nil { |
| 113 | return AgentGrantRequest{}, errors.New("invalid: grant request has no changes" ) |
| 114 | } |
| 115 | if err := validateGrantChanges(req.Changes); err != nil { |
| 116 | return AgentGrantRequest{}, err |
| 117 | } |
| 118 | return req, nil |
| 119 | } |
| 120 | |
| 121 | func validateGrantChanges(changes AgentGrantChanges) error { |
| 122 | for _, room := range changes.Rooms { |
| 123 | if !ValidRoomID(room) { |
| 124 | return errors.New("invalid: grant request room" ) |
| 125 | } |
| 126 | } |
| 127 | repos, sites := map[string]bool{}, map[string]bool{} |
| 128 | for _, repo := range changes.Repos { |
| 129 | key := repo.Owner + ":" + repo.Identifier |
| 130 | if repos[key] { |
| 131 | return errors.New("invalid: repeated repository in grant request" ) |
| 132 | } |
| 133 | repos[key] = true |
| 134 | } |
| 135 | for _, site := range changes.Sites { |
| 136 | if sites[site.Label] || site.TTLDays < 0 { |
| 137 | return errors.New("invalid: duplicate site or negative TTL in grant request" ) |
| 138 | } |
| 139 | sites[site.Label] = true |
| 140 | } |
| 141 | return nil |
| 142 | } |
| 143 | |
| 144 | func (s *Service) ReviewAgentGrantRequest(ctx context.Context, e event.Event, now int64) (AgentGrantReview, error) { |
| 145 | req, err := decodeGrantRequest(e) |
| 146 | if err != nil { |
| 147 | return AgentGrantReview{}, err |
| 148 | } |
| 149 | if err := grantRequestOpen(ctx, s.store.DB(), e, now); err != nil { |
| 150 | return AgentGrantReview{}, err |
| 151 | } |
| 152 | operator := event.Tag(e, "p" ) |
| 153 | if req.Base != event.Tag(e, "E" ) || req.Base != event.Tag(e, "e" ) { |
| 154 | return AgentGrantReview{}, errors.New("invalid: grant request base must match its NIP-22 references" ) |
| 155 | } |
| 156 | if len(event.TagValues(e, "p" )) != 1 || operator == "" { |
| 157 | return AgentGrantReview{}, errors.New("invalid: grant request needs exactly one operator" ) |
| 158 | } |
| 159 | if len(event.Tag(e, "E" )) != 64 || event.Tag(e, "e" ) != event.Tag(e, "E" ) || event.Tag(e, "K" ) != "30392" || event.Tag(e, "k" ) != "30392" || event.Tag(e, "P" ) != operator || event.Tag(e, "p" ) != operator { |
| 160 | return AgentGrantReview{}, errors.New("invalid: grant request needs matching NIP-22 grant references" ) |
| 161 | } |
| 162 | var raw string |
| 163 | var currentID string |
| 164 | var paused int |
| 165 | var revokedAt int64 |
| 166 | if err := s.store.DB().QueryRowContext(ctx, `SELECT event_id,paused,revoked_at FROM agent_grants WHERE agent=?` , e.PubKey).Scan(¤tID, &paused, &revokedAt); err != nil || currentID != req.Base { |
| 167 | return AgentGrantReview{}, errors.New("conflict: grant request is no longer for the current grant" ) |
| 168 | } |
| 169 | if err := s.store.DB().QueryRowContext(ctx, `SELECT raw FROM events WHERE id=? AND kind=?` , req.Base, event.KIND_AGENT_GRANT).Scan(&raw); err != nil { |
| 170 | if err := s.store.DB().QueryRowContext(ctx, `SELECT raw FROM agent_grant_revisions WHERE event_id=?` , req.Base).Scan(&raw); err != nil { |
| 171 | return AgentGrantReview{}, errors.New("invalid: current agent grant not found" ) |
| 172 | } |
| 173 | } |
| 174 | var beforeEvent event.Event |
| 175 | if beforeEvent, err = event.Parse([]byte(raw)); err != nil { |
| 176 | return AgentGrantReview{}, err |
| 177 | } |
| 178 | review, err := s.reviewAgainstGrant(e, req, beforeEvent, now) |
| 179 | if err != nil { |
| 180 | return AgentGrantReview{}, err |
| 181 | } |
| 182 | review.Before.Paused = paused != 0 |
| 183 | review.Before.RevokedAt = revokedAt |
| 184 | if !review.Before.Active(now) { |
| 185 | return AgentGrantReview{}, errors.New("restricted: grant request is not for the agent's active current grant" ) |
| 186 | } |
| 187 | return review, nil |
| 188 | } |
| 189 | |
| 190 | func (s *Service) reviewAgainstGrant(e event.Event, req AgentGrantRequest, beforeEvent event.Event, now int64) (AgentGrantReview, error) { |
| 191 | operator := event.Tag(e, "p" ) |
| 192 | before, err := ParseAgentGrant(beforeEvent, now) |
| 193 | if err != nil { |
| 194 | return AgentGrantReview{}, err |
| 195 | } |
| 196 | if before.Agent != e.PubKey || before.Owner != operator || !before.Active(now) { |
| 197 | return AgentGrantReview{}, errors.New("restricted: grant request is not for the agent's active current grant" ) |
| 198 | } |
| 199 | afterEvent := beforeEvent |
| 200 | afterEvent.Tags = grantRequestTags(beforeEvent.Tags, req.Changes) |
| 201 | afterEvent.Tags = append(afterEvent.Tags, []string{"grant-request" , e.ID}, []string{"grant-base" , req.Base}, []string{"e" , e.ID, "" , "grant-request" }) |
| 202 | afterEvent.ID, afterEvent.Sig, afterEvent.CreatedAt = "" , "" , now |
| 203 | if afterEvent.CreatedAt <= beforeEvent.CreatedAt { |
| 204 | afterEvent.CreatedAt = beforeEvent.CreatedAt + 1 |
| 205 | } |
| 206 | after, err := ParseAgentGrant(afterEvent, now) |
| 207 | if err != nil { |
| 208 | return AgentGrantReview{}, err |
| 209 | } |
| 210 | if reflect.DeepEqual(after.Scope, before.Scope) { |
| 211 | return AgentGrantReview{}, errors.New("invalid: grant request changes nothing" ) |
| 212 | } |
| 213 | return AgentGrantReview{RequestID: e.ID, Base: req.Base, Agent: before.Agent, Operator: operator, Before: before, After: after, Unsigned: afterEvent}, nil |
| 214 | } |
| 215 | |
| 216 | func (s *Service) ValidateAgentGrantReplacement(ctx context.Context, e event.Event, now int64) error { |
| 217 | return s.validateGrantReplacement(ctx, s.store.DB(), e, now) |
| 218 | } |
| 219 | |
| 220 | func (s *Service) validateGrantReplacement(ctx context.Context, tx grantRequestReader, e event.Event, now int64) error { |
| 221 | requestID := event.Tag(e, "grant-request" ) |
| 222 | baseID := event.Tag(e, "grant-base" ) |
| 223 | if requestID == "" || baseID == "" || !slices.Contains(event.TagValues(e, "e" ), requestID) { |
| 224 | return errors.New("invalid: grant replacement needs grant request provenance" ) |
| 225 | } |
| 226 | var raw string |
| 227 | if err := tx.QueryRowContext(ctx, `SELECT raw FROM events WHERE id=? AND kind=1111` , requestID).Scan(&raw); err != nil { |
| 228 | return errors.New("invalid: grant request is not stored" ) |
| 229 | } |
| 230 | request, err := event.Parse([]byte(raw)) |
| 231 | if err != nil { |
| 232 | return err |
| 233 | } |
| 234 | if err := grantRequestOpen(ctx, tx, request, now); err != nil { |
| 235 | return err |
| 236 | } |
| 237 | var grantRaw string |
| 238 | if err := tx.QueryRowContext(ctx, `SELECT raw FROM events WHERE id=? AND kind=?` , baseID, event.KIND_AGENT_GRANT).Scan(&grantRaw); err != nil { |
| 239 | if err := tx.QueryRowContext(ctx, `SELECT raw FROM agent_grant_revisions WHERE event_id=?` , baseID).Scan(&grantRaw); err != nil { |
| 240 | return errors.New("invalid: current agent grant not found" ) |
| 241 | } |
| 242 | } |
| 243 | grantEvent, err := event.Parse([]byte(grantRaw)) |
| 244 | if err != nil { |
| 245 | return err |
| 246 | } |
| 247 | req, err := decodeGrantRequest(request) |
| 248 | if err != nil { |
| 249 | return err |
| 250 | } |
| 251 | review, err := s.reviewAgainstGrant(request, req, grantEvent, now) |
| 252 | if err != nil || review.Base != baseID || review.Operator != e.PubKey || review.Agent != event.Tag(e, "d" ) { |
| 253 | return errors.New("restricted: grant replacement does not match the reviewed request" ) |
| 254 | } |
| 255 | var paused int |
| 256 | var revokedAt int64 |
| 257 | if err := tx.QueryRowContext(ctx, `SELECT paused,revoked_at FROM agent_grants WHERE agent=?` , review.Agent).Scan(&paused, &revokedAt); err != nil { |
| 258 | return errors.New("conflict: agent grant is no longer current" ) |
| 259 | } |
| 260 | if paused != 0 || revokedAt != 0 || review.After.ExpiresAt <= now { |
| 261 | return errors.New("restricted: grant request is no longer active" ) |
| 262 | } |
| 263 | got, err := ParseAgentGrant(e, now) |
| 264 | if err != nil { |
| 265 | return err |
| 266 | } |
| 267 | if !reflect.DeepEqual(got.Scope, review.After.Scope) || got.ExpiresAt != review.After.ExpiresAt || got.Agent != review.After.Agent || got.Owner != review.After.Owner || got.Name != review.After.Name || e.Content != grantEvent.Content { |
| 268 | return errors.New("invalid: grant replacement scope differs from the reviewed request" ) |
| 269 | } |
| 270 | if !reflect.DeepEqual(e.Tags, review.Unsigned.Tags) { |
| 271 | return errors.New("invalid: grant replacement tags differ from the reviewed request" ) |
| 272 | } |
| 273 | var current string |
| 274 | if err := tx.QueryRowContext(ctx, `SELECT event_id FROM agent_grants WHERE agent=?` , got.Agent).Scan(¤t); err != nil || current != baseID { |
| 275 | return errors.New("conflict: agent grant changed since the request" ) |
| 276 | } |
| 277 | return nil |
| 278 | } |
| 279 | |
| 280 | func grantRequestTags(tags [][]string, changes AgentGrantChanges) [][]string { |
| 281 | replaceRepo := map[string]bool{} |
| 282 | for _, repo := range changes.Repos { |
| 283 | replaceRepo[repo.Owner+":" +repo.Identifier] = true |
| 284 | } |
| 285 | replaceSite := map[string]bool{} |
| 286 | for _, site := range changes.Sites { |
| 287 | replaceSite[site.Label] = true |
| 288 | } |
| 289 | copyTags := make([][]string, 0, len(tags)+len(changes.Kinds)+len(changes.Rooms)) |
| 290 | seenKinds := map[string]bool{} |
| 291 | seenRooms := map[string]bool{} |
| 292 | remove := map[string]bool{} |
| 293 | if changes.Wiki != nil { |
| 294 | remove["wiki" ] = true |
| 295 | } |
| 296 | if changes.Jobs != nil { |
| 297 | remove["jobs" ] = true |
| 298 | } |
| 299 | if changes.Rate != nil { |
| 300 | remove["rate" ] = true |
| 301 | } |
| 302 | for _, tag := range tags { |
| 303 | skip := false |
| 304 | if len(tag) > 1 && tag[0] == "repo" { |
| 305 | parts := strings.SplitN(tag[1], ":" , 3) |
| 306 | skip = len(parts) == 3 && replaceRepo[parts[0]+":" +parts[1]] |
| 307 | } |
| 308 | if len(tag) > 1 && tag[0] == "sites" { |
| 309 | skip = replaceSite[tag[1]] |
| 310 | } |
| 311 | if len(tag) > 0 && !remove[tag[0]] && !skip && tag[0] != "grant-request" && tag[0] != "grant-base" && !(tag[0] == "e" && len(tag) > 3 && tag[3] == "grant-request" ) { |
| 312 | copyTags = append(copyTags, append([]string(nil), tag...)) |
| 313 | if len(tag) > 1 && tag[0] == "k" { |
| 314 | seenKinds[tag[1]] = true |
| 315 | } |
| 316 | if len(tag) > 1 && tag[0] == "room" { |
| 317 | seenRooms[tag[1]] = true |
| 318 | } |
| 319 | } |
| 320 | } |
| 321 | // Changes are patches: retain the old entries and add or replace only the |
| 322 | // requested keys. Reconstructing these fields also gives deterministic |
| 323 | // output when a request repeats an existing value. |
| 324 | for _, k := range changes.Kinds { |
| 325 | value := fmt.Sprint(k) |
| 326 | if !seenKinds[value] { |
| 327 | copyTags = append(copyTags, []string{"k" , value}) |
| 328 | seenKinds[value] = true |
| 329 | } |
| 330 | } |
| 331 | for _, room := range changes.Rooms { |
| 332 | if !seenRooms[room] { |
| 333 | copyTags = append(copyTags, []string{"room" , room}) |
| 334 | seenRooms[room] = true |
| 335 | } |
| 336 | } |
| 337 | for _, repo := range changes.Repos { |
| 338 | copyTags = append(copyTags, []string{"repo" , repo.Owner + ":" + repo.Identifier + ":" + repo.Level}) |
| 339 | } |
| 340 | for _, site := range changes.Sites { |
| 341 | tag := []string{"sites" , site.Label} |
| 342 | if site.TTLDays > 0 { |
| 343 | tag = append(tag, fmt.Sprintf("ttl=%d" , site.TTLDays)) |
| 344 | } |
| 345 | if site.Encrypted { |
| 346 | tag = append(tag, "encrypted" ) |
| 347 | } |
| 348 | copyTags = append(copyTags, tag) |
| 349 | } |
| 350 | if changes.Wiki != nil { |
| 351 | copyTags = append(copyTags, []string{"wiki" , *changes.Wiki}) |
| 352 | } |
| 353 | if changes.Jobs != nil { |
| 354 | copyTags = append(copyTags, []string{"jobs" , *changes.Jobs}) |
| 355 | } |
| 356 | if changes.Rate != nil { |
| 357 | copyTags = append(copyTags, []string{"rate" , fmt.Sprint(*changes.Rate)}) |
| 358 | } |
| 359 | return copyTags |
| 360 | } |