#208 enable custom Content-Type for SendFile

gorequest.go

@@ -734,10 +734,11 @@ func (s *SuperAgent) SendString(content string) *SuperAgent {
 type File struct {
 	Filename  string
 	Fieldname string
+	MimeType  string
 	Data      []byte
 }
 
-// SendFile function works only with type "multipart". The function accepts one mandatory and up to two optional arguments. The mandatory (first) argument is the file.
+// SendFile function works only with type "multipart". The function accepts one mandatory and up to three optional arguments. The mandatory (first) argument is the file.
 // The function accepts a path to a file as string:
 //
 //      gorequest.New().
@@ -784,10 +785,20 @@ type File struct {
 //        SendFile(b, "", "my_custom_fieldname"). // filename left blank, will become "example_file.ext"
 //        End()
 //
+// The third optional argument (fourth argument overall) is the mimetype request form-data part. It defaults to "application/octet-stream".
+//
+//      b, _ := ioutil.ReadFile("./example_file.ext")
+//      gorequest.New().
+//        Post("http://example.com").
+//        Type("multipart").
+//        SendFile(b, "filename", "my_custom_fieldname", "mime_type").
+//        End()
+//
 func (s *SuperAgent) SendFile(file interface{}, args ...string) *SuperAgent {
 
 	filename := ""
 	fieldname := "file"
+	fileType := "application/octet-stream"
 
 	if len(args) >= 1 && len(args[0]) > 0 {
 		filename = strings.TrimSpace(args[0])
@@ -798,6 +809,13 @@ func (s *SuperAgent) SendFile(file interface{}, args ...string) *SuperAgent {
 	if fieldname == "file" || fieldname == "" {
 		fieldname = "file" + strconv.Itoa(len(s.FileData)+1)
 	}
+	if len(args) >= 3 && len(args[2]) > 0 {
+		fileType = strings.TrimSpace(args[2])
+	}
+	if fileType == "" {
+		s.Errors = append(s.Errors, errors.New("The fourth SendFile method argument for MIME type cannot be an empty string"))
+		return s
+	}
 
 	switch v := reflect.ValueOf(file); v.Kind() {
 	case reflect.String:
@@ -817,6 +835,7 @@ func (s *SuperAgent) SendFile(file interface{}, args ...string) *SuperAgent {
 		s.FileData = append(s.FileData, File{
 			Filename:  filename,
 			Fieldname: fieldname,
+			MimeType:  fileType,
 			Data:      data,
 		})
 	case reflect.Slice:
@@ -827,6 +846,7 @@ func (s *SuperAgent) SendFile(file interface{}, args ...string) *SuperAgent {
 		f := File{
 			Filename:  filename,
 			Fieldname: fieldname,
+			MimeType:  fileType,
 			Data:      make([]byte, len(slice)),
 		}
 		for i := range slice {
@@ -837,9 +857,12 @@ func (s *SuperAgent) SendFile(file interface{}, args ...string) *SuperAgent {
 		if len(args) == 1 {
 			return s.SendFile(v.Elem().Interface(), args[0])
 		}
-		if len(args) >= 2 {
+		if len(args) == 2 {
 			return s.SendFile(v.Elem().Interface(), args[0], args[1])
 		}
+		if len(args) >= 3 {
+			return s.SendFile(v.Elem().Interface(), args[0], args[1], args[2])
+		}
 		return s.SendFile(v.Elem().Interface())
 	default:
 		if v.Type() == reflect.TypeOf(os.File{}) {
@@ -855,6 +878,7 @@ func (s *SuperAgent) SendFile(file interface{}, args ...string) *SuperAgent {
 			s.FileData = append(s.FileData, File{
 				Filename:  filename,
 				Fieldname: fieldname,
+				MimeType:  fileType,
 				Data:      data,
 			})
 			return s
@@ -1239,7 +1263,7 @@ func (s *SuperAgent) MakeRequest() (*http.Request, error) {
 		// add the files
 		if len(s.FileData) != 0 {
 			for _, file := range s.FileData {
-				fw, _ := mw.CreateFormFile(file.Fieldname, file.Filename)
+				fw, _ := CreateFormFile(mw, file.Fieldname, file.Filename, file.MimeType)
 				fw.Write(file.Data)
 			}
 			contentReader = buf
@@ -1299,6 +1323,23 @@ func (s *SuperAgent) MakeRequest() (*http.Request, error) {
 	return req, nil
 }
 
+var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
+
+func escapeQuotes(s string) string {
+	return quoteEscaper.Replace(s)
+}
+
+// CreateFormFile is a convenience wrapper around CreatePart. It creates
+// a new form-data header with the provided field name and file name.
+func CreateFormFile(w *multipart.Writer, fieldname, filename string, contenttype string) (io.Writer, error) {
+	h := make(textproto.MIMEHeader)
+	h.Set("Content-Disposition",
+		fmt.Sprintf(`form-data; name="%s"; filename="%s"`,
+			escapeQuotes(fieldname), escapeQuotes(filename)))
+	h.Set("Content-Type", contenttype)
+	return w.CreatePart(h)
+}
+
 // AsCurlCommand returns a string representing the runnable `curl' command
 // version of the request.
 func (s *SuperAgent) AsCurlCommand() (string, error) {

gorequest_test.go

@@ -761,13 +761,15 @@ func TestMultipartRequest(t *testing.T) {
 	const case10b_send_file_by_path_pointer = "/send_file_by_path_pointer"
 	const case11_send_file_by_path_without_name = "/send_file_by_path_without_name"
 	const case12_send_file_by_path_without_name_but_with_fieldname = "/send_file_by_path_without_name_but_with_fieldname"
+	const case121_send_file_by_path_with_name_and_fieldname_and_mimetype = "/send_file_by_path_with_name_and_fieldname_and_mimetype"
 
 	const case13_send_file_by_content_without_name = "/send_file_by_content_without_name"
 	const case13a_send_file_by_content_without_name_pointer = "/send_file_by_content_without_name_pointer"
 	const case14_send_file_by_content_with_name = "/send_file_by_content_with_name"
 
 	const case15_send_file_by_content_without_name_but_with_fieldname = "/send_file_by_content_without_name_but_with_fieldname"
 	const case16_send_file_by_content_with_name_and_with_fieldname = "/send_file_by_content_with_name_and_with_fieldname"
+	const case161_send_file_by_content_with_name_and_fieldname_and_mimetype = "/send_file_by_content_with_name_and_fieldname_and_mimetype"
 
 	const case17_send_file_multiple_by_path_and_content_without_name = "/send_file_multiple_by_path_and_content_without_name"
 	const case18_send_file_multiple_by_path_and_content_with_name = "/send_file_multiple_by_path_and_content_with_name"
@@ -998,6 +1000,21 @@ func TestMultipartRequest(t *testing.T) {
 				t.Error("Expected Header:Content-Type:application/octet-stream", "| but got", r.MultipartForm.File["my_fieldname"][0].Header["Content-Type"])
 			}
 			checkFile(t, r.MultipartForm.File["my_fieldname"][0])
+		case case161_send_file_by_content_with_name_and_fieldname_and_mimetype, case121_send_file_by_path_with_name_and_fieldname_and_mimetype:
+			if len(r.MultipartForm.File) != 1 {
+				t.Error("Expected length of files:[] == 1", "| but got", len(r.MultipartForm.File))
+			}
+			if _, ok := r.MultipartForm.File["my_fieldname"]; !ok {
+				keys := reflect.ValueOf(r.MultipartForm.File).MapKeys()
+				t.Error("Expected Fieldname:my_fieldname", "| but got", keys)
+			}
+			if r.MultipartForm.File["my_fieldname"][0].Filename != "MY_LICENSE" {
+				t.Error("Expected Filename:MY_LICENSE", "| but got", r.MultipartForm.File["my_fieldname"][0].Filename)
+			}
+			if r.MultipartForm.File["my_fieldname"][0].Header["Content-Type"][0] != "application/octet-stream" {
+				t.Error("Expected Header:Content-Type:application/json", "| but got", r.MultipartForm.File["my_fieldname"][0].Header["Content-Type"])
+			}
+			checkFile(t, r.MultipartForm.File["my_fieldname"][0])
 		case case17_send_file_multiple_by_path_and_content_without_name:
 			if len(r.MultipartForm.File) != 2 {
 				t.Error("Expected length of files:[] == 2", "| but got", len(r.MultipartForm.File))
@@ -1208,6 +1225,11 @@ func TestMultipartRequest(t *testing.T) {
 		SendFile(fileByPath, "", "my_fieldname").
 		End()
 
+	New().Post(ts.URL+ case121_send_file_by_path_with_name_and_fieldname_and_mimetype).
+		Type("multipart").
+		SendFile(fileByPath, "MY_LICENSE", "my_fieldname", "application/json").
+		End()
+
 	b, _ := ioutil.ReadFile("./LICENSE")
 	New().Post(ts.URL + case13_send_file_by_content_without_name).
 		Type("multipart").
@@ -1234,6 +1256,11 @@ func TestMultipartRequest(t *testing.T) {
 		SendFile(b, "MY_LICENSE", "my_fieldname").
 		End()
 
+	New().Post(ts.URL+case12_send_file_by_content_with_name_and_fieldname_and_mimetype).
+		Type("multipart").
+		SendFile(b, "MY_LICENSE", "my_fieldname", "application/json").
+		End()
+
 	New().Post(ts.URL + case17_send_file_multiple_by_path_and_content_without_name).
 		Type("multipart").
 		SendFile("./LICENSE").