test(gw): add t0115-gateway-dir-listing.sh to sharness

This adds proper end-to-end tests for directory listing on Gateway port
that protects us against regressions oni each gw type:
- path gateway
- subdomain gateway
- dnslink website gateway

Tests cover:
- etag/unicode support
- breadcrumbs
- file name column
- hash column


This commit was moved from ipfs/kubo@3ed46d9

gateway/core/corehttp/gateway_handler.go

@@ -405,10 +405,6 @@ func (i *gatewayHandler) getOrHeadHandler(w http.ResponseWriter, r *http.Request
 		Hash:        hash,
 	}
 
-	// TODO: remove logging below
-	// tplDataJSON, _ := json.MarshalIndent(tplData, "", " ")
-	// fmt.Println(string(tplDataJSON))
-
 	err = listingTemplate.Execute(w, tplData)
 	if err != nil {
 		internalWebError(w, err)

gateway/core/corehttp/gateway_indexPage.go

@@ -82,8 +82,8 @@ func shortHash(hash string) string {
 // (when hostname from gwURL is matching /ipns/<fqdn> in path)
 func hasDNSLinkOrigin(gwURL string, path string) bool {
 	if gwURL != "" {
-		dnslinkRoot := strings.Replace(gwURL, "//", "/ipns/", 1)
-		return strings.HasPrefix(path, dnslinkRoot)
+		fqdn := stripPort(strings.TrimPrefix(gwURL, "//"))
+		return strings.HasPrefix(path, "/ipns/"+fqdn)
 	}
 	return false
 }

gateway/core/corehttp/gateway_test.go

@@ -393,6 +393,8 @@ func TestIPNSHostnameRedirect(t *testing.T) {
 
 // Test directory listing on DNSLink website
 // (scenario when Host header is the same as URL hostname)
+// This is basic regression test: additional end-to-end tests
+// can be found in test/sharness/t0115-gateway-dir-listing.sh
 func TestIPNSHostnameBacklinks(t *testing.T) {
 	ns := mockNamesys{}
 	ts, api, ctx := newTestServerAndNode(t, ns)
@@ -439,7 +441,7 @@ func TestIPNSHostnameBacklinks(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	// expect correct backlinks
+	// expect correct links
 	body, err := ioutil.ReadAll(res.Body)
 	if err != nil {
 		t.Fatalf("error reading response: %s", err)
@@ -456,6 +458,10 @@ func TestIPNSHostnameBacklinks(t *testing.T) {
 	if !strings.Contains(s, "<a href=\"/foo%3F%20%23%3C%27/file.txt\">") {
 		t.Fatalf("expected file in directory listing")
 	}
+	if !strings.Contains(s, "<a class=\"ipfs-hash\" href=\"https://cid.ipfs.io/#") {
+		// https://github.com/ipfs/dir-index-html/issues/42
+		t.Fatalf("expected links to cid.ipfs.io in CID column when on DNSLink website")
+	}
 	if !strings.Contains(s, k2.Cid().String()) {
 		t.Fatalf("expected hash in directory listing")
 	}
@@ -489,6 +495,10 @@ func TestIPNSHostnameBacklinks(t *testing.T) {
 	if !strings.Contains(s, "<a href=\"/file.txt\">") {
 		t.Fatalf("expected file in directory listing")
 	}
+	if !strings.Contains(s, "<a class=\"ipfs-hash\" href=\"https://cid.ipfs.io/#") {
+		// https://github.com/ipfs/dir-index-html/issues/42
+		t.Fatalf("expected links to cid.ipfs.io in CID column when on DNSLink website")
+	}
 	if !strings.Contains(s, k.Cid().String()) {
 		t.Fatalf("expected hash in directory listing")
 	}