1package web
2
3import (
4 "net/http"
5 "net/url"
6 "path"
7 "text/template"
8
9 "github.com/charmbracelet/log/v2"
10 "github.com/charmbracelet/soft-serve/pkg/backend"
11 "github.com/charmbracelet/soft-serve/pkg/config"
12 "github.com/charmbracelet/soft-serve/pkg/utils"
13 "github.com/gorilla/mux"
14 "github.com/prometheus/client_golang/prometheus"
15 "github.com/prometheus/client_golang/prometheus/promauto"
16)
17
18var goGetCounter = promauto.NewCounterVec(prometheus.CounterOpts{
19 Namespace: "soft_serve",
20 Subsystem: "http",
21 Name: "go_get_total",
22 Help: "The total number of go get requests",
23}, []string{"repo"})
24
25var repoIndexHTMLTpl = template.Must(template.New("index").Parse(`<!DOCTYPE html>
26<html lang="en">
27<head>
28 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
29 <meta http-equiv="refresh" content="0; url=https://godoc.org/{{ .ImportRoot }}/{{.Repo}}">
30 <meta name="go-import" content="{{ .ImportRoot }}/{{ .Repo }} git {{ .Config.HTTP.PublicURL }}/{{ .Repo }}.git">
31</head>
32<body>
33Redirecting to docs at <a href="https://godoc.org/{{ .ImportRoot }}/{{ .Repo }}">godoc.org/{{ .ImportRoot }}/{{ .Repo }}</a>...
34</body>
35</html>
36`))
37
38// GoGetHandler handles go get requests.
39func GoGetHandler(w http.ResponseWriter, r *http.Request) {
40 ctx := r.Context()
41 cfg := config.FromContext(ctx)
42 be := backend.FromContext(ctx)
43 logger := log.FromContext(ctx)
44 repo := mux.Vars(r)["repo"]
45
46 // Handle go get requests.
47 // This handler is only reached when ?go-get=1 is present due to route matcher.
48 //
49 // Always return a 200 status code, even if the repo path doesn't exist.
50 // It will try to find the repo by walking up the path until it finds one.
51 // If it can't find one, it will return a 404.
52 //
53 // https://golang.org/cmd/go/#hdr-Remote_import_paths
54 // https://go.dev/ref/mod#vcs-branch
55
56 importRoot, err := url.Parse(cfg.HTTP.PublicURL)
57 if err != nil {
58 http.Error(w, err.Error(), http.StatusInternalServerError)
59 return
60 }
61
62 // find the repo
63 for {
64 if _, err := be.Repository(ctx, repo); err == nil {
65 break
66 }
67
68 if repo == "" || repo == "." || repo == "/" {
69 renderNotFound(w, r)
70 return
71 }
72
73 repo = path.Dir(repo)
74 }
75
76 if err := repoIndexHTMLTpl.Execute(w, struct {
77 Repo string
78 Config *config.Config
79 ImportRoot string
80 }{
81 Repo: utils.SanitizeRepo(repo),
82 Config: cfg,
83 ImportRoot: importRoot.Host,
84 }); err != nil {
85 logger.Debug("failed to render go get template", "err", err)
86 renderInternalServerError(w, r)
87 return
88 }
89
90 goGetCounter.WithLabelValues(repo).Inc()
91}