Pass an image buffer into the native functions instead of a URL

utils/image-runner.js

@@ -1,30 +1,36 @@
 const magick = require("../build/Release/image.node");
 const { isMainThread, parentPort, workerData } = require("worker_threads");
+const fetch = require("node-fetch");
 
 exports.run = object => {
   return new Promise((resolve, reject) => {
     // If the image has a path, it must also have a type
+    let promise = new Promise((resolveTest) => { resolveTest(); }); // no-op
     if (object.path) {
       if (object.type !== "image/gif" && object.onlyGIF) resolve({
         buffer: Buffer.alloc(0),
         fileExtension: "nogif"
       });
+      promise = fetch(object.path).then(res => res.buffer());
     }
     // Convert from a MIME type (e.g. "image/png") to something ImageMagick understands (e.g. "png").
     // Don't set `type` directly on the object we are passed as it will be read afterwards.
     // If no image type is given (say, the command generates its own image), make it a PNG.
     const fileExtension = object.type ? object.type.split("/")[1] : "png";
-    const objectWithFixedType = Object.assign({}, object, {type: fileExtension});
-    try {
-      const result = magick[object.cmd](objectWithFixedType);
-      const returnObject = {
-        buffer: result.data,
-        fileExtension: result.type
-      };
-      resolve(returnObject);
-    } catch (e) {
-      reject(e);
-    }
+    promise.then(buf => {
+      object.data = buf;
+      const objectWithFixedType = Object.assign({}, object, {type: fileExtension});
+      try {
+        const result = magick[object.cmd](objectWithFixedType);
+        const returnObject = {
+          buffer: result.data,
+          fileExtension: result.type
+        };
+        resolve(returnObject);
+      } catch (e) {
+        reject(e);
+      }
+    });
   });
 };