Ported Image operations + some cleanup

src/core/operations/ExtractEXIF.mjs

@@ -0,0 +1,56 @@
+/**
+ * @author tlwr [toby@toby.codes]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ */
+
+import ExifParser from "exif-parser";
+import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
+
+/**
+ * Extract EXIF operation
+ */
+class ExtractEXIF extends Operation {
+
+    /**
+     * ExtractEXIF constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Extract EXIF";
+        this.module = "Image";
+        this.description = "Extracts EXIF data from an image.\n<br><br>\nEXIF data is metadata embedded in images (JPEG, JPG, TIFF) and audio files.\n<br><br>\nEXIF data from photos usually contains information about the image file itself as well as the device used to create it.";
+        this.inputType = "ArrayBuffer";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        try {
+            const parser = ExifParser.create(input);
+            const result = parser.parse();
+
+            const lines = [];
+            for (const tagName in result.tags) {
+                const value = result.tags[tagName];
+                lines.push(`${tagName}: ${value}`);
+            }
+
+            const numTags = lines.length;
+            lines.unshift(`Found ${numTags} tags.\n`);
+            return lines.join("\n");
+        } catch (err) {
+            throw new OperationError(`Could not extract EXIF data from image: ${err}`);
+        }
+    }
+
+}
+
+export default ExtractEXIF;