From d90994408fed47a8fb7a2d82e2f751d8da7067e4 Mon Sep 17 00:00:00 2001
From: Grégoire Duchêne <gduchene@awhk.org>
Date: Sat, 4 Jun 2022 16:20:04 +0100
Subject: Generate destinations with a regular expression

---
 main.go      |  3 ++-
 resp.go      | 20 ++++++++------------
 resp_test.go | 25 ++-----------------------
 3 files changed, 12 insertions(+), 36 deletions(-)

diff --git a/main.go b/main.go
index 71d40de..10e1703 100644
--- a/main.go
+++ b/main.go
@@ -13,6 +13,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"regexp"
 	"time"
 
 	"golang.org/x/sys/unix"
@@ -33,7 +34,7 @@ func main() {
 	done := make(chan os.Signal, 1)
 	signal.Notify(done, os.Interrupt, unix.SIGTERM)
 
-	srv := http.Server{Handler: &redirector{*from, *to, *vcs}}
+	srv := http.Server{Handler: &redirector{regexp.MustCompile(*from), *to, *vcs}}
 	go func() {
 		ln, err := listenSD()
 		if err != nil {
diff --git a/resp.go b/resp.go
index 2bbe434..b213f58 100644
--- a/resp.go
+++ b/resp.go
@@ -8,7 +8,7 @@ import (
 	"log"
 	"net/http"
 	"path"
-	"strings"
+	"regexp"
 	"text/template"
 )
 
@@ -21,9 +21,11 @@ var (
 
 type bodyData struct{ Package, Repository, VCS string }
 
-type redirector struct{ from, to, vcs string }
-
-var _ http.Handler = &redirector{}
+type redirector struct {
+	re   *regexp.Regexp
+	repl string
+	vcs  string
+}
 
 func (h *redirector) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	if req.Method != http.MethodGet {
@@ -38,17 +40,11 @@ func (h *redirector) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		w.WriteHeader(http.StatusFound)
 		return
 	}
-	dest := h.getRepo(pkg)
+
+	dest := h.re.ReplaceAllString(pkg, h.repl)
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	w.WriteHeader(http.StatusOK)
 	if err := body.Execute(w, bodyData{pkg, dest, h.vcs}); err != nil {
 		log.Println(err)
 	}
 }
-
-func (h *redirector) getRepo(pkg string) string {
-	from := strings.TrimRight(h.from, "/")
-	to := strings.TrimRight(h.to, "/")
-	path := strings.TrimLeft(strings.TrimPrefix(pkg, from), "/")
-	return to + "/" + strings.Split(path, "/")[0]
-}
diff --git a/resp_test.go b/resp_test.go
index 2185403..1f8c458 100644
--- a/resp_test.go
+++ b/resp_test.go
@@ -7,11 +7,12 @@ import (
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"regexp"
 	"testing"
 )
 
 func TestRedirector_ServeHTTP(t *testing.T) {
-	r := &redirector{"src.example.com/x", "https://example.com/git", "git"}
+	r := &redirector{regexp.MustCompile(`src\.example\.com/x`), "https://example.com/git", "git"}
 
 	t.Run("GoVisit", func(t *testing.T) {
 		req := httptest.NewRequest(http.MethodGet, "https://src.example.com/x/foo?go-get=1", nil)
@@ -56,25 +57,3 @@ func TestRedirector_ServeHTTP(t *testing.T) {
 		}
 	})
 }
-
-func TestRedirector_getRepo(t *testing.T) {
-	r := &redirector{"src.example.com/x/", "https://example.com/git/", "git"}
-	for _, tc := range []struct{ pkg, expected string }{
-		{"src.example.com/x/foo", "https://example.com/git/foo"},
-		{"src.example.com/x/foo/bar", "https://example.com/git/foo"},
-	} {
-		if actual := r.getRepo(tc.pkg); actual != tc.expected {
-			t.Errorf("expected %q, got %q", tc.expected, actual)
-		}
-	}
-
-	r = &redirector{"src.example.com/x", "https://example.com/git", "git"}
-	for _, tc := range []struct{ pkg, expected string }{
-		{"src.example.com/x/foo", "https://example.com/git/foo"},
-		{"src.example.com/x/foo/bar", "https://example.com/git/foo"},
-	} {
-		if actual := r.getRepo(tc.pkg); actual != tc.expected {
-			t.Errorf("expected %q, got %q", tc.expected, actual)
-		}
-	}
-}
-- 
cgit v1.2.3-70-g09d2