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services/cover/resizer.js

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+const sharp = require("sharp");
+const fs = require("fs");
+
+
+/*
+  RADIO COVER
+*/
+const radio_cover_sizes = [
+  { width: 128, height: 128, fit: "cover" },
+  { width: 64, height: 64, fit: "cover" },
+  { width: 32, height: 32, fit: "cover" }
+];
+exports.resize_image_for_radio = function (image, callback) {
+  resizer(image, radio_cover_sizes, callback);
+};
+
+/*
+  ALBUM COVER
+*/
+const album_cover_sizes = [
+  { width: 256, height: 256, fit: "cover" },
+  { width: 128, height: 128, fit: "cover" },
+  { width: 64, height: 64, fit: "cover" },
+  { width: 32, height: 32, fit: "cover" }
+];
+exports.resize_image_for_album = function (image, callback) {
+  if (typeof image === 'string') {
+    let data = fs.readFileSync(image);
+    resizer(data, album_cover_sizes, callback);
+  } else {
+    resizer(image, album_cover_sizes, callback);
+  }
+};
+
+/*
+  ARTIST COVER
+*/
+const artist_cover_sizes = [
+  { width: 1024, height: 512, fit: "cover" },
+  { width: 512, height: 256, fit: "cover" },
+  { width: 256, height: 128, fit: "cover" },
+  { width: 128, height: 64, fit: "cover" },
+  { width: 64, height: 32, fit: "cover" }
+];
+exports.resize_image_for_artist = function (image, callback) {
+  if (typeof image === 'string') {
+    console.log("resizing: " + image);
+    let data = fs.readFileSync(image);
+    resizer(data, artist_cover_sizes, callback);
+  } else {
+    resizer(image, artist_cover_sizes, callback);
+  }
+};
+
+/*
+  BOX COVER
+*/
+const box_cover_sizes = [
+  { width: 256, height: 362, fit: "cover" },
+  { width: 128, height: 181, fit: "cover" },
+  { width: 64, height: 90, fit: "cover" },
+  { width: 32, height: 45, fit: "cover" }
+];
+exports.resize_image_for_box = function (image, callback) {
+  if (typeof image === 'string') {
+    let data = fs.readFileSync(image);
+    resizer(data, box_cover_sizes, callback);
+  } else {
+    resizer(image, box_cover_sizes, callback);
+  }
+};
+
+
+function resizer(image, array, callback) {
+  let result = {}
+  let runner = (image, index) => {
+    if (index < array.length) {
+      let size = array[index];
+      sharp(image)
+        .resize(size)
+        .png()
+        .toBuffer()
+        .then(data => {
+          result["cover" + size.width] = "data:image/png;base64, " + Buffer.from(data).toString("base64");
+          runner(data, ++index);
+        }).catch(err=>{
+          console.log(err);
+        });
+    } else {
+      if (callback) {
+        callback(result);
+      }
+    }
+  }
+  runner(image, 0);
+}