| 1 | package workspacestate |
| 2 | |
| 3 | import ( |
| 4 | "crypto/sha256" |
| 5 | "encoding/hex" |
| 6 | "encoding/json" |
| 7 | ) |
| 8 | |
| 9 | // ReadVersions contains only immutable invalidation tokens. It does not grant |
| 10 | // execution authority or retain a second mutable copy of registry records. |
| 11 | // Construct once per verified publication, then query only visible identities. |
| 12 | type ReadVersions struct { |
| 13 | sources map[string]string |
| 14 | sessions map[string]string |
| 15 | } |
| 16 | |
| 17 | type sourceReadBinding struct { |
| 18 | Mapping SourceMapping |
| 19 | State SessionState |
| 20 | } |
| 21 | |
| 22 | func readVersion(value any) string { |
| 23 | body, _ := json.Marshal(value) |
| 24 | digest := sha256.Sum256(body) |
| 25 | return hex.EncodeToString(digest[:]) |
| 26 | } |
| 27 | |
| 28 | // NewReadVersions reads the supplied snapshot without retaining or changing its |
| 29 | // mutable fields. Source aliases are resolved once per distinct saved path. |
| 30 | func NewReadVersions(state State) *ReadVersions { |
| 31 | v := &ReadVersions{sources: map[string]string{}, sessions: map[string]string{}} |
| 32 | byPath := map[string]map[string]sourceReadBinding{} |
| 33 | bySession := map[string]map[string]SourceMapping{} |
| 34 | pathKeys := map[string]string{} |
| 35 | for key, mapping := range state.SourceMappings { |
| 36 | pathKey, known := pathKeys[mapping.Path] |
| 37 | if !known { |
| 38 | pathKey, _ = sourcePathKey(mapping.Path) |
| 39 | pathKeys[mapping.Path] = pathKey |
| 40 | } |
| 41 | if pathKey != "" { |
| 42 | if byPath[pathKey] == nil { |
| 43 | byPath[pathKey] = map[string]sourceReadBinding{} |
| 44 | } |
| 45 | byPath[pathKey][key] = sourceReadBinding{mapping, state.SessionStates[mapping.SessionID]} |
| 46 | } |
| 47 | if bySession[mapping.SessionID] == nil { |
| 48 | bySession[mapping.SessionID] = map[string]SourceMapping{} |
| 49 | } |
| 50 | bySession[mapping.SessionID][key] = mapping |
| 51 | } |
| 52 | for path, bindings := range byPath { |
| 53 | v.sources[path] = readVersion(bindings) |
| 54 | } |
| 55 | for id, status := range state.SessionStates { |
| 56 | v.sessions[id] = readVersion([]any{status, bySession[id]}) |
| 57 | } |
| 58 | // Preserve mapping-only identities as well. Older registries can omit the |
| 59 | // explicit lifecycle entry until their first owned mutation. |
| 60 | for id, mappings := range bySession { |
| 61 | if _, exists := v.sessions[id]; !exists { |
| 62 | v.sessions[id] = readVersion([]any{SessionState{}, mappings}) |
| 63 | } |
| 64 | } |
| 65 | return v |
| 66 | } |
| 67 | |
| 68 | func (v *ReadVersions) Source(path string) (string, error) { |
| 69 | if len(v.sources) == 0 { |
| 70 | return "", nil |
| 71 | } |
| 72 | key, err := sourcePathKey(path) |
| 73 | if err != nil { |
| 74 | return "", err |
| 75 | } |
| 76 | return v.sources[key], nil |
| 77 | } |
| 78 | |
| 79 | func (v *ReadVersions) Session(id string) string { return v.sessions[id] } |
| 80 | |
| 81 | func (r *ReadSnapshot) ReadVersions() *ReadVersions { return r.versions } |
| 82 |