Add:Cover image cache, resize & use webp image #223

server/utils/resizeImage.js

@@ -1,13 +1,13 @@
 const sharp = require('sharp')
 const fs = require('fs')
 
-function resize(filePath, width, height) {
+function resize(filePath, width, height, format = 'webp') {
   const readStream = fs.createReadStream(filePath);
   let sharpie = sharp()
-  sharpie.toFormat('jpeg')
+  sharpie.toFormat(format)
 
   if (width || height) {
-    sharpie.resize(width, height)
+    sharpie.resize(width, height, { withoutEnlargement: true })
   }
 
   return readStream.pipe(sharpie)