feat(server/image-upload): add support for pdf upload

@@ -32,12 +32,26 @@ class FileController extends Context {
     _.each(files, file => {
       const types = file.type.split('/');
 
-      if (!types || types[0] !== 'image') {
-        errTip = '上传文件格式不正确！';
+      // add support for pdf
+      const isPdf = /pdf/i.test(file.type || '');
+      if (isPdf) {
+        // 5M
+        if (file.size > 5 * 1024 * 1024) {
+          errTip = '上传文件尺寸太大！';
+        }
+      } else {
+        if (!types || types[0] !== 'image') {
+          errTip = '上传文件格式不正确！';
+        }
+
+        // 10M
+        if (file.size > 10 * 1024 * 1024) {
+          errTip = '上传文件尺寸太大！';
+        }
       }
 
-      if (file.size > 10 * 1024 * 1024) {
-        errTip = '上传文件尺寸太大！';
+      if (errTip) {
+        return false; // return early
       }
       req.body.files.push(fs.createReadStream(file.path));
       req.body.files.push(file.name);
@@ -49,7 +63,7 @@ class FileController extends Context {
       });
     }
 
-    if (req.body.bucket === 'goodsimg') {
+    if (req.body.bucket === 'goodsimg' || req.body.bucket === 'invoice') {
       this.api
         .upload('http://upload.static.yohobuy.com', {
           fileData: req.body.files,