play with a simple local module host

257/main.go

@@ -0,0 +1,63 @@
+// Play with a simple local module host.
+package main
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"path"
+)
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		switch path.Clean(req.URL.Path) {
+		case "/test/mod", "/test/mod/pkg":
+			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+			io.WriteString(w, `<meta name="go-import" content="localhost.localhost/test/mod mod https:">`)
+		case "/test/mod/@v/list":
+			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+			io.WriteString(w, "v0.0.0\n")
+		case "/test/mod/@v/v0.0.0.info":
+			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+			io.WriteString(w, "{\n\t\"Version\": \"v0.0.0\",\n\t\"Time\": \"2019-05-04T15:44:36Z\"\n}\n")
+		case "/test/mod/@v/v0.0.0.mod":
+			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+			io.WriteString(w, "module localhost.localhost/test/mod\n")
+		case "/test/mod/@v/v0.0.0.zip":
+			w.Header().Set("Content-Type", "application/zip")
+			z := zip.NewWriter(w)
+			defer z.Close()
+			for _, file := range []struct {
+				Name, Body string
+			}{
+				{"localhost.localhost/test/mod@v0.0.0/go.mod", "module localhost.localhost/test/mod\n"},
+				{"localhost.localhost/test/mod@v0.0.0/pkg.go", "package pkg\n\n// Life is the answer.\nconst Life = 42\n"},
+				{"localhost.localhost/test/mod@v0.0.0/pkg/pkg.go", "package pkg\n\n// Life is the answer.\nconst Life = 43\n"},
+			} {
+				f, err := z.Create(file.Name)
+				if err != nil {
+					panic(err)
+				}
+				_, err = f.Write([]byte(file.Body))
+				if err != nil {
+					panic(err)
+				}
+			}
+		default:
+			http.Error(w, "404 Not Found", http.StatusNotFound)
+		}
+	})
+
+	fmt.Println("starting HTTPS server")
+	err := http.ListenAndServeTLS("127.0.0.1:https", "localhost.localhost.pem", "localhost.localhost-key.pem", top{})
+	log.Fatalln(err)
+}
+
+type top struct{}
+
+func (top) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	fmt.Println(req.Method, req.URL)
+	http.DefaultServeMux.ServeHTTP(w, req)
+}