Fix pdf

main.go

@@ -99,6 +99,7 @@ func endpoints(foo http.HandlerFunc) http.HandlerFunc {
 				fmt.Fprintln(w, err.Error())
 			}
 		} else {
+			setContentTypeIfMedia(w, r)
 			foo(w, r)
 		}
 	}
@@ -201,3 +202,59 @@ func toRealPath(p string) string {
 	d := path.Join(fs.Get("d").GetString())
 	return path.Join(d, p)
 }
+
+func setContentTypeIfMedia(w http.ResponseWriter, r *http.Request) {
+	ext := strings.ToLower(path.Ext(r.URL.Path))
+	if i := strings.LastIndex(ext, "."); i != -1 {
+		ext = ext[i:]
+	}
+	k := "Content-Type"
+	v := ""
+	switch ext {
+	case ".mp4":
+		v = "video/mp4"
+	case ".mkv":
+		v = "video/x-matroska"
+	case ".mp3":
+		v = "audio/mpeg3"
+	case ".epub", ".mobi":
+		k = "Content-Disposition"
+		v = "attachment"
+	case ".jpg", ".jpeg":
+		v = "image/jpeg"
+	case ".gif":
+		v = "image/gif"
+	case ".png":
+		v = "image/png"
+	case ".ico":
+		v = "image/x-icon"
+	case ".svg":
+		v = "image/svg+xml"
+	case ".css":
+		v = "text/css"
+	case ".js":
+		v = "text/javascript"
+	case ".json":
+		v = "application/json"
+	case ".html", ".htm":
+		v = "text/html"
+	case ".pdf":
+		w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", path.Base(r.URL.Path)))
+		v = "application/pdf"
+	case ".webm":
+		v = "video/webm"
+	case ".weba":
+		v = "audio/webm"
+	case ".webp":
+		v = "image/webp"
+	case ".zip":
+		v = "application/zip"
+	case ".7z":
+		v = "application/x-7z-compressed"
+	case ".tar":
+		v = "application/x-tar"
+	default:
+		return
+	}
+	w.Header().Set(k, v)
+}

main_test.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+)
+
+func TestSetContentType(t *testing.T) {
+	t.Parallel()
+
+	cases := map[string]struct {
+		path string
+		want string
+	}{
+		"css with multi .": {
+			path: "/static/css/main.2145ce41.chunk.css",
+			want: "text/css",
+		},
+	}
+
+	for name, d := range cases {
+		c := d
+		t.Run(name, func(t *testing.T) {
+			r := &http.Request{URL: &url.URL{Path: c.path}}
+			w := httptest.NewRecorder()
+			setContentTypeIfMedia(w, r)
+			if ct := w.Header().Get("Content-Type"); ct != c.want {
+				t.Errorf("wrong content type: want %q, got %q", c.want, ct)
+			}
+		})
+	}
+}