Proxy support for several media types

closes #615
closes #635

http/response/builder.go

@@ -12,6 +12,8 @@ import (
 	"net/http"
 	"strings"
 	"time"
+
+	"miniflux.app/logger"
 )
 
 const compressionThreshold = 1024
@@ -88,7 +90,10 @@ func (b *Builder) Write() {
 	case io.Reader:
 		// Compression not implemented in this case
 		b.writeHeaders()
-		io.Copy(b.w, v)
+		_, err := io.Copy(b.w, v)
+		if err != nil {
+			logger.Error("%v", err)
+		}
 	}
 }
 

http/response/html/html.go

@@ -72,3 +72,16 @@ func NotFound(w http.ResponseWriter, r *http.Request) {
 func Redirect(w http.ResponseWriter, r *http.Request, uri string) {
 	http.Redirect(w, r, uri, http.StatusFound)
 }
+
+// RequestedRangeNotSatisfiable sends a range not satisfiable error to the client.
+func RequestedRangeNotSatisfiable(w http.ResponseWriter, r *http.Request, contentRange string) {
+	logger.Error("[HTTP:Range Not Satisfiable] %s", r.URL)
+
+	builder := response.New(w, r)
+	builder.WithStatus(http.StatusRequestedRangeNotSatisfiable)
+	builder.WithHeader("Content-Type", "text/html; charset=utf-8")
+	builder.WithHeader("Cache-Control", "no-cache, max-age=0, must-revalidate, no-store")
+	builder.WithHeader("Content-Range", contentRange)
+	builder.WithBody("Range Not Satisfiable")
+	builder.Write()
+}

http/response/html/html_test.go

@@ -210,3 +210,32 @@ func TestRedirectResponse(t *testing.T) {
 		t.Fatalf(`Unexpected redirect location, got %q instead of %q`, actualResult, expectedResult)
 	}
 }
+
+func TestRequestedRangeNotSatisfiable(t *testing.T) {
+	r, err := http.NewRequest("GET", "/", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	w := httptest.NewRecorder()
+
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		RequestedRangeNotSatisfiable(w, r, "bytes */12777")
+	})
+
+	handler.ServeHTTP(w, r)
+
+	resp := w.Result()
+	defer resp.Body.Close()
+
+	expectedStatusCode := http.StatusRequestedRangeNotSatisfiable
+	if resp.StatusCode != expectedStatusCode {
+		t.Fatalf(`Unexpected status code, got %d instead of %d`, resp.StatusCode, expectedStatusCode)
+	}
+
+	expectedContentRangeHeader := "bytes */12777"
+	actualContentRangeHeader := resp.Header.Get("Content-Range")
+	if actualContentRangeHeader != expectedContentRangeHeader {
+		t.Fatalf(`Unexpected content range header, got %q instead of %q`, actualContentRangeHeader, expectedContentRangeHeader)
+	}
+}