Fix: cannot edit file in remote server / Modify: separate preview and text-file content controller

pkg/request/request.go

@@ -151,6 +151,7 @@ func (resp *Response) CheckHTTPResponse(status int) *Response {
 
 type nopRSCloser struct {
 	body io.ReadCloser
+	size int64
 }
 
 // GetRSCloser 返回带有空seeker的body reader
@@ -161,6 +162,7 @@ func (resp *Response) GetRSCloser() (response.RSCloser, error) {
 
 	return nopRSCloser{
 		body: resp.Response.Body,
+		size: resp.Response.ContentLength,
 	}, resp.Err
 }
 
@@ -174,7 +176,16 @@ func (instance nopRSCloser) Close() error {
 	return instance.body.Close()
 }
 
-// 实现 nopRSCloser seeker
+// 实现 nopRSCloser seeker, 只实现seek开头/结尾以便http.ServeContent用于确定正文大小
 func (instance nopRSCloser) Seek(offset int64, whence int) (int64, error) {
+	if offset == 0 {
+		switch whence {
+		case io.SeekStart:
+			return 0, nil
+		case io.SeekEnd:
+			return instance.size, nil
+		}
+	}
 	return 0, errors.New("未实现")
+
 }

pkg/request/request_test.go

@@ -156,14 +156,20 @@ func TestResponse_GetRSCloser(t *testing.T) {
 	// 正常
 	{
 		resp := Response{
-			Response: &http.Response{Body: ioutil.NopCloser(strings.NewReader("123"))},
+			Response: &http.Response{ContentLength: 3, Body: ioutil.NopCloser(strings.NewReader("123"))},
 		}
 		res, err := resp.GetRSCloser()
 		asserts.NoError(err)
 		content, err := ioutil.ReadAll(res)
 		asserts.NoError(err)
 		asserts.Equal("123", string(content))
-		_, err = res.Seek(0, 0)
+		offset, err := res.Seek(0, 0)
+		asserts.NoError(err)
+		asserts.Equal(int64(0), offset)
+		offset, err = res.Seek(0, 2)
+		asserts.NoError(err)
+		asserts.Equal(int64(3), offset)
+		_, err = res.Seek(1, 2)
 		asserts.Error(err)
 		asserts.NoError(res.Close())
 	}

pkg/request/slave_test.go

@@ -26,7 +26,7 @@ func TestRemoteCallback(t *testing.T) {
 			"http://test/test/url",
 			testMock.Anything,
 			testMock.Anything,
-		).Return(Response{
+		).Return(&Response{
 			Err: nil,
 			Response: &http.Response{
 				StatusCode: 200,