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 "tangled.org/core/knotmirror/models"
17)
18
19var mirrorToKnotNSID = map[string]string{
20 tangled.GitTempListBranchesNSID: tangled.RepoBranchesNSID,
21 tangled.GitTempListTagsNSID: tangled.RepoTagsNSID,
22 tangled.GitTempListCommitsNSID: tangled.RepoLogNSID,
23 tangled.GitTempGetTreeNSID: tangled.RepoTreeNSID,
24 tangled.GitTempGetBranchNSID: tangled.RepoBranchNSID,
25 tangled.GitTempGetBlobNSID: tangled.RepoBlobNSID,
26 tangled.GitTempGetTagNSID: tangled.RepoTagNSID,
27 tangled.GitTempGetArchiveNSID: tangled.RepoArchiveNSID,
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 if repo.State != models.RepoStatePending && repo.State != models.RepoStateResyncing {
51 go func() {
52 if err := db.UpdateRepoState(context.Background(), x.db, repo.Did, repo.Rkey, models.RepoStatePending); err != nil {
53 x.logger.Error("failed to mark repo for resync after proxy", "err", err)
54 }
55 }()
56 }
57 knotURL := repo.KnotDomain
58 if !strings.Contains(repo.KnotDomain, "://") {
59 if host, _ := db.GetHost(ctx, x.db, repo.KnotDomain); host != nil {
60 knotURL = host.URL()
61 } else {
62 x.logger.Warn("repo is from unknown knot")
63 if x.cfg.KnotUseSSL {
64 knotURL = "https://" + knotURL
65 } else {
66 knotURL = "http://" + knotURL
67 }
68 }
69 }
70 return &knotInfo{baseURL: knotURL, didSlashRepo: repo.DidSlashRepo()}, nil
71 }
72
73 owner, err := x.resolver.ResolveIdent(ctx, repoAt.Authority().String())
74 if err != nil {
75 return nil, fmt.Errorf("resolving repo owner: %w", err)
76 }
77
78 xrpcc := indigoxrpc.Client{Host: owner.PDSEndpoint()}
79 out, err := atproto.RepoGetRecord(ctx, &xrpcc, "", tangled.RepoNSID, repoAt.Authority().String(), repoAt.RecordKey().String())
80 if err != nil {
81 return nil, fmt.Errorf("fetching repo record from PDS: %w", err)
82 }
83
84 record := out.Value.Val.(*tangled.Repo)
85 knotURL := record.Knot
86 if !strings.Contains(record.Knot, "://") {
87 if host, _ := db.GetHost(ctx, x.db, record.Knot); host != nil {
88 knotURL = host.URL()
89 } else {
90 x.logger.Warn("repo is from unknown knot")
91 if x.cfg.KnotUseSSL {
92 knotURL = "https://" + knotURL
93 } else {
94 knotURL = "http://" + knotURL
95 }
96 }
97 }
98
99 return &knotInfo{
100 baseURL: knotURL,
101 didSlashRepo: fmt.Sprintf("%s/%s", owner.DID, record.Name),
102 }, nil
103}
104
105func (x *Xrpc) proxyToKnot(w http.ResponseWriter, r *http.Request, repoAt syntax.ATURI) bool {
106 mirrorNSID := strings.TrimPrefix(r.URL.Path, "/xrpc/")
107 knotNSID, ok := mirrorToKnotNSID[mirrorNSID]
108 if !ok {
109 return false
110 }
111
112 knot, err := x.resolveKnot(r.Context(), repoAt)
113 if err != nil {
114 x.logger.Warn("proxy: failed to resolve knot", "repo", repoAt, "err", err)
115 return false
116 }
117
118 params := make(url.Values)
119 for k, v := range r.URL.Query() {
120 params[k] = v
121 }
122 params.Set("repo", knot.didSlashRepo)
123
124 target := fmt.Sprintf("%s/xrpc/%s?%s", knot.baseURL, knotNSID, params.Encode())
125
126 req, err := http.NewRequestWithContext(r.Context(), http.MethodGet, target, nil)
127 if err != nil {
128 x.logger.Warn("proxy: failed to build request", "target", target, "err", err)
129 return false
130 }
131
132 resp, err := x.httpClient.Do(req)
133 if err != nil {
134 x.logger.Warn("proxy: knot request failed", "target", target, "err", err)
135 return false
136 }
137 defer resp.Body.Close()
138
139 for k, vv := range resp.Header {
140 if hopByHopHeaders[k] {
141 continue
142 }
143 for _, v := range vv {
144 w.Header().Add(k, v)
145 }
146 }
147 w.WriteHeader(resp.StatusCode)
148 if _, err := io.Copy(w, resp.Body); err != nil {
149 x.logger.Warn("proxy: response copy interrupted", "target", target, "err", err)
150 }
151
152 x.logger.Info("proxy: served from knot", "repo", repoAt, "knot", knot.baseURL, "status", resp.StatusCode)
153 return true
154}