复制外链图片, 下载到本地

https://github.com/leanote/desktop-app/issues/65

node_modules/file.js

@@ -589,8 +589,27 @@ var File = {
 				}
 			});
 		}
-
 	},
+
+	// 复制外站图片
+	copyOtherSiteImage: function(src, callback) {
+		var me = this;
+		me.downloadImg(src, function (filePath) {
+			if (filePath) {
+				me._addImage(Common.objectId(), filePath, function(file) {
+					if (file) {
+						callback(Evt.getImageLocalUrl(file.FileId));
+					}
+					else {
+						callback(false);
+					}
+				});
+			}
+			else {
+				callback(false);
+			}
+		});
+	}
 };
 
 module.exports = File;