Add remove EXIF operation

package.json

@@ -80,6 +80,7 @@
     "lodash": "^4.17.4",
     "moment": "^2.17.1",
     "moment-timezone": "^0.5.11",
+    "piexifjs": "^1.0.3",
     "sladex-blowfish": "^0.8.1",
     "sortablejs": "^1.5.1",
     "split.js": "^1.2.0",

src/core/config/Categories.js

@@ -210,6 +210,7 @@ const Categories = [
             "XPath expression",
             "CSS selector",
             "Extract EXIF",
+            "Remove EXIF",
         ]
     },
     {

src/core/config/OperationConfig.js

@@ -3388,6 +3388,19 @@ const OperationConfig = {
             }
         ]
     },
+    "Remove EXIF": {
+        description: [
+            "Removes EXIF data from an image.",
+            "<br><br>",
+            "EXIF data is metadata embedded in images (JPEG, JPG, TIFF) and audio files.",
+            "<br><br>",
+            "EXIF data from photos usually contains information about the image file itself as well as the device used to create it.",
+        ].join("\n"),
+        run: Image.removeEXIF,
+        inputType: "byteArray",
+        outputType: "byteArray",
+        args: [],
+    },
 };
 
 export default OperationConfig;

src/core/operations/Image.js

@@ -1,4 +1,5 @@
 import * as ExifParser from "exif-parser";
+import * as Piexifjs from "piexifjs";
 import Utils from "../Utils.js";
 import FileType from "./FileType.js";
 
@@ -43,6 +44,31 @@ const Image = {
         }
     },
 
+    /**
+     * Remove EXIF operation.
+     *
+     * Removes EXIF data from a byteArray, representing a JPG.
+     *
+     * @author David Moodie [davidmoodie12@gmail.com]
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    removeEXIF(input, args) {
+        try {
+            // Piexifjs seems to work best with base64 input
+            const base64 = "data:image/jpeg;base64," + Utils.toBase64(input);
+            const newImageB64 = Piexifjs.remove(base64);
+
+            // Convert the base64 back to byteArray
+            const newImage = Utils.fromBase64(newImageB64.split(",")[1], null, "byteArray");
+            return newImage;
+        } catch (err) {
+            // Simply return input if no EXIF data is found
+            if (err == "Exif not found.") return input;
+            throw "Could not remove EXIF data from image: " + err;
+        }
+    },
 
     /**
      * @constant