Add "Extract EXIF" operation

src/core/operations/Image.js

@@ -0,0 +1,36 @@
+import * as ExifParser from "exif-parser";
+import Utils from "../Utils.js";
+
+
+/**
+ * Image operations.
+ *
+ * @author tlwr [toby@toby.codes]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ *
+ * @namespace
+ */
+const Image = {
+    runEXIF(input, args) {
+        try {
+            let bytes = Uint8Array.from(input);
+            let parser = ExifParser.create(bytes.buffer);
+            let result = parser.parse();
+
+            let lines = [];
+            for (let tagName in result.tags) {
+                let value = result.tags[tagName];
+                lines.push(`${tagName}: ${value}`);
+            }
+
+            let numTags = lines.length;
+            lines.unshift(`Found ${numTags} tags.\n`);
+            return lines.join("\n");
+        } catch (err) {
+            throw "Could not EXIF data from image: " + err;
+        }
+    },
+};
+
+export default Image;