alice.pds.demo.boltless.dev
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1package xrpc
2
3import (
4 "context"
5 "fmt"
6 "io"
7 "net/http"
8 "net/url"
9 "strings"
10
11 "github.com/bluesky-social/indigo/api/atproto"
12 "github.com/bluesky-social/indigo/atproto/syntax"
13 indigoxrpc "github.com/bluesky-social/indigo/xrpc"
14 "tangled.org/core/api/tangled"
15 "tangled.org/core/knotmirror/db"
16)
17
18var mirrorToKnotNSID = map[string]string{
19 tangled.GitTempListBranchesNSID: tangled.RepoBranchesNSID,
20 tangled.GitTempListTagsNSID: tangled.RepoTagsNSID,
21 tangled.GitTempListCommitsNSID: tangled.RepoLogNSID,
22 tangled.GitTempGetTreeNSID: tangled.RepoTreeNSID,
23 tangled.GitTempGetBranchNSID: tangled.RepoBranchNSID,
24 tangled.GitTempGetBlobNSID: tangled.RepoBlobNSID,
25 tangled.GitTempGetTagNSID: tangled.RepoTagNSID,
26 tangled.GitTempGetArchiveNSID: tangled.RepoArchiveNSID,
27 tangled.RepoBlobNSID: tangled.RepoBlobNSID,
28 tangled.GitTempListLanguagesNSID: tangled.RepoLanguagesNSID,
29}
30
31var hopByHopHeaders = map[string]bool{
32 "Connection": true,
33 "Keep-Alive": true,
34 "Transfer-Encoding": true,
35 "Te": true,
36 "Trailer": true,
37 "Upgrade": true,
38 "Proxy-Authorization": true,
39 "Proxy-Authenticate": true,
40}
41
42type knotInfo struct {
43 baseURL string
44 didSlashRepo string
45}
46
47func (x *Xrpc) resolveKnot(ctx context.Context, repoAt syntax.ATURI) (*knotInfo, error) {
48 repo, err := db.GetRepoByAtUri(ctx, x.db, repoAt)
49 if err == nil && repo != nil {
50 knotURL := repo.KnotDomain
51 if !strings.Contains(repo.KnotDomain, "://") {
52 if host, _ := db.GetHost(ctx, x.db, repo.KnotDomain); host != nil {
53 knotURL = host.URL()
54 } else {
55 x.logger.Warn("repo is from unknown knot")
56 if x.cfg.KnotUseSSL {
57 knotURL = "https://" + knotURL
58 } else {
59 knotURL = "http://" + knotURL
60 }
61 }
62 }
63 return &knotInfo{baseURL: knotURL, didSlashRepo: repo.DidSlashRepo()}, nil
64 }
65
66 owner, err := x.resolver.ResolveIdent(ctx, repoAt.Authority().String())
67 if err != nil {
68 return nil, fmt.Errorf("resolving repo owner: %w", err)
69 }
70
71 xrpcc := indigoxrpc.Client{Host: owner.PDSEndpoint()}
72 out, err := atproto.RepoGetRecord(ctx, &xrpcc, "", tangled.RepoNSID, repoAt.Authority().String(), repoAt.RecordKey().String())
73 if err != nil {
74 return nil, fmt.Errorf("fetching repo record from PDS: %w", err)
75 }
76
77 record := out.Value.Val.(*tangled.Repo)
78 knotURL := record.Knot
79 if !strings.Contains(record.Knot, "://") {
80 if host, _ := db.GetHost(ctx, x.db, record.Knot); host != nil {
81 knotURL = host.URL()
82 } else {
83 x.logger.Warn("repo is from unknown knot")
84 if x.cfg.KnotUseSSL {
85 knotURL = "https://" + knotURL
86 } else {
87 knotURL = "http://" + knotURL
88 }
89 }
90 }
91
92 return &knotInfo{
93 baseURL: knotURL,
94 didSlashRepo: fmt.Sprintf("%s/%s", owner.DID, record.Name),
95 }, nil
96}
97
98func (x *Xrpc) proxyToKnot(w http.ResponseWriter, r *http.Request, repoAt syntax.ATURI) bool {
99 mirrorNSID := strings.TrimPrefix(r.URL.Path, "/xrpc/")
100 knotNSID, ok := mirrorToKnotNSID[mirrorNSID]
101 if !ok {
102 return false
103 }
104
105 knot, err := x.resolveKnot(r.Context(), repoAt)
106 if err != nil {
107 x.logger.Warn("proxy: failed to resolve knot", "repo", repoAt, "err", err)
108 return false
109 }
110
111 params := make(url.Values)
112 for k, v := range r.URL.Query() {
113 params[k] = v
114 }
115 params.Set("repo", knot.didSlashRepo)
116
117 target := fmt.Sprintf("%s/xrpc/%s?%s", knot.baseURL, knotNSID, params.Encode())
118
119 req, err := http.NewRequestWithContext(r.Context(), http.MethodGet, target, nil)
120 if err != nil {
121 x.logger.Warn("proxy: failed to build request", "target", target, "err", err)
122 return false
123 }
124
125 resp, err := x.httpClient.Do(req)
126 if err != nil {
127 x.logger.Warn("proxy: knot request failed", "target", target, "err", err)
128 return false
129 }
130 defer resp.Body.Close()
131
132 for k, vv := range resp.Header {
133 if hopByHopHeaders[k] {
134 continue
135 }
136 for _, v := range vv {
137 w.Header().Add(k, v)
138 }
139 }
140 w.WriteHeader(resp.StatusCode)
141 if _, err := io.Copy(w, resp.Body); err != nil {
142 x.logger.Warn("proxy: response copy interrupted", "target", target, "err", err)
143 }
144
145 x.logger.Info("proxy: served from knot", "repo", repoAt, "knot", knot.baseURL, "status", resp.StatusCode)
146 return true
147}