internal/httpd/routes.go
171 lines · 8101 bytes
1package httpd
2
3import (
4 "fmt"
5 "net"
6 "net/http"
7 "strings"
8)
9
10// Route is one entry in the explicit route table. The view-only guarantee is
11// structural: Handler() consults web.mode when building the table, and the
12// route test asserts no mutating route exists in view_only mode.
13type Route struct {
14 Method string
15 Pattern string // without method prefix
16 // Mutating marks routes that can change server state. The git transport
17 // POSTs are not mutating: upload-pack is a pure read, and the
18 // receive-pack endpoint is a static refusal that writes nothing.
19 Mutating bool
20 Handler http.HandlerFunc
21}
22
23// Routes returns the route table for the configured web.mode.
24func (s *Server) Routes() []Route {
25 // Git smart transport (anonymous, public repos only).
26 routes := []Route{
27 {Method: "GET", Pattern: "/{owner}/{repo}/info/refs", Handler: s.infoRefs},
28 {Method: "POST", Pattern: "/{owner}/{repo}/git-upload-pack", Handler: s.uploadPack},
29 {Method: "POST", Pattern: "/{owner}/{repo}/git-receive-pack", Handler: s.receivePackRefusal},
30 }
31
32 // Web UI, read-only. These exist in every mode.
33 routes = append(routes,
34 Route{Method: "GET", Pattern: "/{$}", Handler: s.index},
35 Route{Method: "GET", Pattern: "/explore", Handler: s.explore},
36 Route{Method: "GET", Pattern: "/privacy", Handler: s.privacy},
37 Route{Method: "GET", Pattern: "/static/style.css", Handler: s.stylesheet},
38 Route{Method: "GET", Pattern: "/favicon.svg", Handler: s.favicon},
39 Route{Method: "GET", Pattern: "/{owner}", Handler: s.ownerPage},
40 Route{Method: "GET", Pattern: "/{owner}/{repo}", Handler: s.repoHome},
41 Route{Method: "GET", Pattern: "/{owner}/{repo}/tree/{ref}/{path...}", Handler: s.tree},
42 Route{Method: "GET", Pattern: "/{owner}/{repo}/blob/{ref}/{path...}", Handler: s.blob},
43 Route{Method: "GET", Pattern: "/{owner}/{repo}/blame/{ref}/{path...}", Handler: s.blame},
44 Route{Method: "GET", Pattern: "/{owner}/{repo}/search", Handler: s.search},
45 Route{Method: "GET", Pattern: "/{owner}/{repo}/milestones", Handler: s.milestones},
46 Route{Method: "GET", Pattern: "/{owner}/{repo}/wiki", Handler: s.wiki},
47 Route{Method: "GET", Pattern: "/{owner}/{repo}/wiki/_raw/{path...}", Handler: s.wikiRaw},
48 Route{Method: "GET", Pattern: "/{owner}/{repo}/wiki/{page}", Handler: s.wiki},
49 Route{Method: "GET", Pattern: "/{owner}/{repo}/releases", Handler: s.releases},
50 Route{Method: "GET", Pattern: "/{owner}/{repo}/releases/download/{tag}/{name}", Handler: s.releaseAsset},
51 Route{Method: "GET", Pattern: "/{owner}/{repo}/raw/{ref}/{path...}", Handler: s.raw},
52 Route{Method: "GET", Pattern: "/{owner}/{repo}/log", Handler: s.log},
53 Route{Method: "GET", Pattern: "/{owner}/{repo}/log/{ref}", Handler: s.log},
54 Route{Method: "GET", Pattern: "/{owner}/{repo}/commit/{sha}", Handler: s.commit},
55 Route{Method: "GET", Pattern: "/{owner}/{repo}/refs", Handler: s.refs},
56 Route{Method: "GET", Pattern: "/{owner}/{repo}/archive/{file}", Handler: s.archive},
57 Route{Method: "GET", Pattern: "/{owner}/{repo}/issues", Handler: s.issues},
58 Route{Method: "GET", Pattern: "/{owner}/{repo}/issues/{n}", Handler: s.issue},
59 Route{Method: "GET", Pattern: "/{owner}/{repo}/mrs", Handler: s.mrs},
60 Route{Method: "GET", Pattern: "/{owner}/{repo}/mrs/{n}", Handler: s.mr},
61 )
62
63 // The JSON API is its own opt-in surface, independent of web.mode.
64 if s.cfg.API.Enabled {
65 routes = append(routes,
66 Route{Method: "POST", Pattern: "/api/v1/cmd", Mutating: true, Handler: s.apiCmd},
67 )
68 }
69
70 // Account-mode routes exist only when web.mode = "accounts". In
71 // view_only they are never registered — the structural guarantee.
72 if s.cfg.Web.Mode == "accounts" {
73 routes = append(routes,
74 Route{Method: "GET", Pattern: "/login", Handler: s.login, Mutating: true}, // consumes a one-time token
75 Route{Method: "POST", Pattern: "/logout", Mutating: true,
76 Handler: s.checkOrigin(s.logout)},
77 Route{Method: "GET", Pattern: "/new", Handler: s.requireUser(s.newRepoForm)},
78 )
79 // Web signup fronts the same registration path as SSH register,
80 // so it exists only when registration is open or invite.
81 if s.cfg.Registration.Mode != "closed" {
82 routes = append(routes,
83 Route{Method: "GET", Pattern: "/register", Handler: s.signupForm},
84 Route{Method: "POST", Pattern: "/register", Mutating: true,
85 Handler: s.checkOrigin(s.signupSubmit)},
86 )
87 }
88 routes = append(routes,
89 Route{Method: "POST", Pattern: "/new", Mutating: true,
90 Handler: s.checkOrigin(s.requireUser(s.newRepoSubmit))},
91 Route{Method: "POST", Pattern: "/{owner}/{repo}/pin", Mutating: true,
92 Handler: s.checkOrigin(s.requireUser(s.pinToggle))},
93 Route{Method: "GET", Pattern: "/{owner}/{repo}/issues/new",
94 Handler: s.requireUser(s.issueCreateForm)},
95 Route{Method: "POST", Pattern: "/{owner}/{repo}/issues/new", Mutating: true,
96 Handler: s.checkOrigin(s.requireUser(s.issueCreateSubmit))},
97 Route{Method: "POST", Pattern: "/{owner}/{repo}/issues/{n}/comment", Mutating: true,
98 Handler: s.checkOrigin(s.requireUser(s.issueCommentSubmit))},
99 Route{Method: "POST", Pattern: "/{owner}/{repo}/issues/{n}/edit", Mutating: true,
100 Handler: s.checkOrigin(s.requireUser(s.issueEditSubmit))},
101 Route{Method: "POST", Pattern: "/{owner}/{repo}/mrs/{n}/edit", Mutating: true,
102 Handler: s.checkOrigin(s.requireUser(s.mrEditSubmit))},
103 Route{Method: "POST", Pattern: "/{owner}/{repo}/mrs/{n}/comment", Mutating: true,
104 Handler: s.checkOrigin(s.requireUser(s.mrCommentSubmit))},
105 Route{Method: "GET", Pattern: "/{owner}/{repo}/edit/{ref}/{path...}",
106 Handler: s.requireUser(s.editForm)},
107 Route{Method: "POST", Pattern: "/{owner}/{repo}/edit/{ref}/{path...}", Mutating: true,
108 Handler: s.checkOrigin(s.requireUser(s.editSubmit))},
109 )
110 }
111 return routes
112}
113
114func (s *Server) Handler() http.Handler {
115 mux := http.NewServeMux()
116 for _, r := range s.Routes() {
117 mux.HandleFunc(r.Method+" "+r.Pattern, r.Handler)
118 }
119 var h http.Handler = mux
120 if len(s.cfg.GoImport) > 0 {
121 h = s.goImportHandler(mux)
122 }
123 return s.securityHeaders(h)
124}
125
126// securityHeaders sets defensive response headers on every reply. The CSP
127// is strict where it can be: no scripts at all (the UI needs none), no
128// plugins, no embedding. Inline styles are allowed because chroma emits
129// inline style attributes on highlighted code and label chips carry their
130// color inline. Images may load from anywhere so external README images
131// still render; they are the one thing a reader-facing forge can't police
132// without a proxy.
133func (s *Server) securityHeaders(next http.Handler) http.Handler {
134 const csp = "default-src 'self'; script-src 'none'; style-src 'self' 'unsafe-inline'; " +
135 "img-src * data:; object-src 'none'; base-uri 'none'; form-action 'self'; frame-ancestors 'none'"
136 return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
137 hd := w.Header()
138 hd.Set("Content-Security-Policy", csp)
139 hd.Set("X-Frame-Options", "DENY")
140 hd.Set("X-Content-Type-Options", "nosniff")
141 hd.Set("Referrer-Policy", "no-referrer")
142 hd.Set("Cross-Origin-Opener-Policy", "same-origin")
143 if s.cfg.HTTP.TLS != "off" {
144 hd.Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
145 }
146 next.ServeHTTP(w, r)
147 })
148}
149
150func (s *Server) goImportHandler(mux http.Handler) http.Handler {
151 // Vanity Go modules: ?go-get=1 requests under a configured module
152 // path answer with the go-import meta tag before normal routing.
153 return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
154 if r.URL.Query().Get("go-get") == "1" {
155 host := r.Host
156 if h, _, err := net.SplitHostPort(host); err == nil {
157 host = h
158 }
159 requested := host + strings.TrimSuffix(r.URL.Path, "/")
160 for module, repo := range s.cfg.GoImport {
161 if requested == module || strings.HasPrefix(requested, module+"/") {
162 w.Header().Set("Content-Type", "text/html; charset=utf-8")
163 fmt.Fprintf(w, `<!DOCTYPE html><html><head><meta name="go-import" content="%s git %s/%s.git"></head><body>%s</body></html>`,
164 module, s.cfg.Server.SiteURL, repo, module)
165 return
166 }
167 }
168 }
169 mux.ServeHTTP(w, r)
170 })
171}