Remove piexifjs dep and extract removeEXIF to lib module

package.json

@@ -80,7 +80,6 @@
     "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/lib/remove-exif.js

@@ -0,0 +1,163 @@
+/* piexifjs
+The MIT License (MIT)
+Copyright (c) 2014, 2015 hMatoba(https://github.com/hMatoba)
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+function bin2String(array) {
+  return String.fromCharCode.apply(String, array);
+}
+
+function string2Bin(str) {
+  var result = [];
+  for (var i = 0; i < str.length; i++) {
+    result.push(str.charCodeAt(i));
+  }
+  return result;
+}
+
+// Param jpeg should be a binaryArray
+function removeEXIF(jpeg) {
+  // Convert binaryArray to char string
+  jpeg = bin2String(jpeg);
+  if (jpeg.slice(0, 2) != "\xff\xd8") {
+    throw ("Given data is not jpeg.");
+  }
+
+  var segments = splitIntoSegments(jpeg);
+  if (segments[1].slice(0, 2) == "\xff\xe1" &&
+    segments[1].slice(4, 10) == "Exif\x00\x00") {
+    segments = [segments[0]].concat(segments.slice(2));
+  } else if (segments[2].slice(0, 2) == "\xff\xe1" &&
+    segments[2].slice(4, 10) == "Exif\x00\x00") {
+    segments = segments.slice(0, 2).concat(segments.slice(3));
+  } else {
+    throw ("Exif not found.");
+  }
+
+  var new_data = segments.join("");
+
+  // Convert back to binaryArray
+  new_data = string2Bin(new_data);
+
+  return new_data;
+};
+
+function splitIntoSegments(data) {
+  if (data.slice(0, 2) != "\xff\xd8") {
+    throw ("Given data isn't JPEG.");
+  }
+
+  var head = 2;
+  var segments = ["\xff\xd8"];
+  while (true) {
+    if (data.slice(head, head + 2) == "\xff\xda") {
+      segments.push(data.slice(head));
+      break;
+    } else {
+      var length = unpack(">H", data.slice(head + 2, head + 4))[0];
+      var endPoint = head + length + 2;
+      segments.push(data.slice(head, endPoint));
+      head = endPoint;
+    }
+
+    if (head >= data.length) {
+      throw ("Wrong JPEG data.");
+    }
+  }
+  return segments;
+}
+
+function unpack(mark, str) {
+  if (typeof(str) != "string") {
+    throw ("'unpack' error. Got invalid type argument.");
+  }
+  var l = 0;
+  for (var markPointer = 1; markPointer < mark.length; markPointer++) {
+    if (mark[markPointer].toLowerCase() == "b") {
+      l += 1;
+    } else if (mark[markPointer].toLowerCase() == "h") {
+      l += 2;
+    } else if (mark[markPointer].toLowerCase() == "l") {
+      l += 4;
+    } else {
+      throw ("'unpack' error. Got invalid mark.");
+    }
+  }
+
+  if (l != str.length) {
+    throw ("'unpack' error. Mismatch between symbol and string length. " + l + ":" + str.length);
+  }
+
+  var littleEndian;
+  if (mark[0] == "<") {
+    littleEndian = true;
+  } else if (mark[0] == ">") {
+    littleEndian = false;
+  } else {
+    throw ("'unpack' error.");
+  }
+  var unpacked = [];
+  var strPointer = 0;
+  var p = 1;
+  var val = null;
+  var c = null;
+  var length = null;
+  var sliced = "";
+
+  while (c = mark[p]) {
+    if (c.toLowerCase() == "b") {
+      length = 1;
+      sliced = str.slice(strPointer, strPointer + length);
+      val = sliced.charCodeAt(0);
+      if ((c == "b") && (val >= 0x80)) {
+        val -= 0x100;
+      }
+    } else if (c == "H") {
+      length = 2;
+      sliced = str.slice(strPointer, strPointer + length);
+      if (littleEndian) {
+        sliced = sliced.split("").reverse().join("");
+      }
+      val = sliced.charCodeAt(0) * 0x100 +
+        sliced.charCodeAt(1);
+    } else if (c.toLowerCase() == "l") {
+      length = 4;
+      sliced = str.slice(strPointer, strPointer + length);
+      if (littleEndian) {
+        sliced = sliced.split("").reverse().join("");
+      }
+      val = sliced.charCodeAt(0) * 0x1000000 +
+        sliced.charCodeAt(1) * 0x10000 +
+        sliced.charCodeAt(2) * 0x100 +
+        sliced.charCodeAt(3);
+      if ((c == "l") && (val >= 0x80000000)) {
+        val -= 0x100000000;
+      }
+    } else {
+      throw ("'unpack' error. " + c);
+    }
+
+    unpacked.push(val);
+    strPointer += length;
+    p += 1;
+  }
+
+  return unpacked;
+}
+
+export default removeEXIF;

src/core/operations/Image.js

@@ -1,5 +1,5 @@
 import * as ExifParser from "exif-parser";
-import * as Piexifjs from "piexifjs";
+import removeEXIF from "../lib/remove-exif.js";
 import Utils from "../Utils.js";
 import FileType from "./FileType.js";
 
@@ -56,13 +56,7 @@ const Image = {
      */
     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;
+            return removeEXIF(input);
         } catch (err) {
             // Simply return input if no EXIF data is found
             if (err === "Exif not found.") return input;