Move all backends into backend directory

backend/yandex/api/api_upload.go

@@ -0,0 +1,34 @@
+package src
+
+//from  yadisk
+
+import (
+	"io"
+	"net/http"
+)
+
+//RootAddr is the base URL for Yandex Disk API.
+const RootAddr = "https://cloud-api.yandex.com" //also https://cloud-api.yandex.net and https://cloud-api.yandex.ru
+
+func (c *Client) setRequestScope(req *http.Request) {
+	req.Header.Add("Accept", "application/json")
+	req.Header.Add("Content-Type", "application/json")
+	req.Header.Add("Authorization", "OAuth "+c.token)
+}
+
+func (c *Client) scopedRequest(method, urlPath string, body io.Reader) (*http.Request, error) {
+	fullURL := RootAddr
+	if urlPath[:1] != "/" {
+		fullURL += "/" + urlPath
+	} else {
+		fullURL += urlPath
+	}
+
+	req, err := http.NewRequest(method, fullURL, body)
+	if err != nil {
+		return req, err
+	}
+
+	c.setRequestScope(req)
+	return req, nil
+}