| 1 | package docs |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "net/http" |
| 7 | "strconv" |
| 8 | "time" |
| 9 | |
| 10 | "amadan.net/oficina/home/roster" |
| 11 | "amadan.net/rastrillo/rastrillo" |
| 12 | "gorm.io/gorm" |
| 13 | ) |
| 14 | |
| 15 | func (s *Store) rememberResponse(ctx context.Context, p permission, docs ...*Document) { |
| 16 | if s.team == nil { |
| 17 | return |
| 18 | } |
| 19 | a, ok := ctx.Value(accessContextKey{}).(*requestAccess) |
| 20 | if !ok || a == nil || a.runtime != s.team { |
| 21 | return |
| 22 | } |
| 23 | if a.responseDocs == nil { |
| 24 | a.responseDocs = map[int64]permission{} |
| 25 | } |
| 26 | a.responseStore = s |
| 27 | for _, doc := range docs { |
| 28 | if prior, ok := a.responseDocs[doc.ID]; !ok || p > prior { |
| 29 | a.responseDocs[doc.ID] = p |
| 30 | } |
| 31 | } |
| 32 | } |
| 33 | func (a *requestAccess) checkResponse(ctx context.Context) error { |
| 34 | if a.responseStore == nil { |
| 35 | return errTeamUnavailable |
| 36 | } |
| 37 | if len(a.responseDocs) == 0 && a.state() == roster.Unknown { |
| 38 | return errTeamUnavailable |
| 39 | } |
| 40 | for id, p := range a.responseDocs { |
| 41 | if e := a.responseStore.checkPermission(ctx, a.responseStore.db.WithContext(ctx), a.actor, id, p); e != nil { |
| 42 | return e |
| 43 | } |
| 44 | } |
| 45 | return nil |
| 46 | } |
| 47 | |
| 48 | // writeGuardedBody checks each bounded chunk after rendering has completed. |
| 49 | // Once headers are sent, refusal must abort the transport rather than produce |
| 50 | // a successful short body with a sequence number for bytes never received. |
| 51 | func writeGuardedBody(w http.ResponseWriter, r *http.Request, status int, parts ...[]byte) error { |
| 52 | a, team := r.Context().Value(accessContextKey{}).(*requestAccess) |
| 53 | if !team || a == nil { |
| 54 | if status != 0 { |
| 55 | w.WriteHeader(status) |
| 56 | } |
| 57 | for _, part := range parts { |
| 58 | if _, e := w.Write(part); e != nil { |
| 59 | return e |
| 60 | } |
| 61 | } |
| 62 | return nil |
| 63 | } |
| 64 | fail := func(e error) { |
| 65 | w.Header().Del("Docs-Seq") |
| 66 | w.Header().Del("Content-Disposition") |
| 67 | w.Header().Del("Content-Length") |
| 68 | code := http.StatusServiceUnavailable |
| 69 | key := "docs.error.generic" |
| 70 | if errors.Is(e, gorm.ErrRecordNotFound) { |
| 71 | code = http.StatusNotFound |
| 72 | key = "docs.error.notfound" |
| 73 | } |
| 74 | http.Error(w, rastrillo.T(r, key), code) |
| 75 | } |
| 76 | controller := http.NewResponseController(w) |
| 77 | prepare := func() error { |
| 78 | remaining := defaultStreamWriteDeadline |
| 79 | if a.state() == roster.Member { |
| 80 | lease := a.decision.Lease.Remaining() |
| 81 | if lease <= 0 { |
| 82 | return errTeamUnavailable |
| 83 | } |
| 84 | if lease < remaining { |
| 85 | remaining = lease |
| 86 | } |
| 87 | } |
| 88 | deadline := time.Now().Add(remaining) |
| 89 | ctx, cancel := context.WithDeadline(r.Context(), deadline) |
| 90 | defer cancel() |
| 91 | if e := a.checkResponse(ctx); e != nil { |
| 92 | return e |
| 93 | } |
| 94 | if ctx.Err() != nil { |
| 95 | return errTeamUnavailable |
| 96 | } |
| 97 | if e := controller.SetWriteDeadline(deadline); e != nil { |
| 98 | return errTeamUnavailable |
| 99 | } |
| 100 | return nil |
| 101 | } |
| 102 | if e := prepare(); e != nil { |
| 103 | fail(e) |
| 104 | return nil |
| 105 | } |
| 106 | total := 0 |
| 107 | for _, part := range parts { |
| 108 | total += len(part) |
| 109 | } |
| 110 | w.Header().Set("Content-Length", strconv.Itoa(total)) |
| 111 | if status == 0 { |
| 112 | status = http.StatusOK |
| 113 | } |
| 114 | w.WriteHeader(status) |
| 115 | defer controller.SetWriteDeadline(time.Time{}) |
| 116 | for _, part := range parts { |
| 117 | for len(part) > 0 { |
| 118 | if e := prepare(); e != nil { |
| 119 | panic(http.ErrAbortHandler) |
| 120 | } |
| 121 | n := min(len(part), 64<<10) |
| 122 | wrote, e := w.Write(part[:n]) |
| 123 | if e != nil || wrote != n { |
| 124 | panic(http.ErrAbortHandler) |
| 125 | } |
| 126 | part = part[n:] |
| 127 | } |
| 128 | } |
| 129 | return nil |
| 130 | } |
| 131 | |
amadan