1 files changed, 153 insertions, 0 deletions
diff --git a/dom/manifest/ImageObjectProcessor.jsm b/dom/manifest/ImageObjectProcessor.jsm
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+++ b/dom/manifest/ImageObjectProcessor.jsm
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+/*
+ * ImageObjectProcessor
+ * Implementation of Image Object processing algorithms from:
+ * http://www.w3.org/TR/appmanifest/#image-object-and-its-members
+ *
+ * This is intended to be used in conjunction with ManifestProcessor.jsm
+ *
+ * Creates an object to process Image Objects as defined by the
+ * W3C specification. This is used to process things like the
+ * icon member and the splash_screen member.
+ *
+ * Usage:
+ *
+ *   .process(aManifest, aBaseURL, aMemberName);
+ *
+ */
+/*exported EXPORTED_SYMBOLS*/
+/*globals Components */
+'use strict';
+const {
+  utils: Cu,
+  interfaces: Ci,
+  classes: Cc
+} = Components;
+
+Cu.importGlobalProperties(['URL']);
+const netutil = Cc['@mozilla.org/network/util;1']
+  .getService(Ci.nsINetUtil);
+
+function ImageObjectProcessor(aConsole, aExtractor) {
+  this.console = aConsole;
+  this.extractor = aExtractor;
+}
+
+// Static getters
+Object.defineProperties(ImageObjectProcessor, {
+  'decimals': {
+    get: function() {
+      return /^\d+$/;
+    }
+  },
+  'anyRegEx': {
+    get: function() {
+      return new RegExp('any', 'i');
+    }
+  }
+});
+
+ImageObjectProcessor.prototype.process = function(
+  aManifest, aBaseURL, aMemberName
+) {
+  const spec = {
+    objectName: 'manifest',
+    object: aManifest,
+    property: aMemberName,
+    expectedType: 'array',
+    trim: false
+  };
+  const extractor = this.extractor;
+  const images = [];
+  const value = extractor.extractValue(spec);
+  if (Array.isArray(value)) {
+    // Filter out images whose "src" is not useful.
+    value.filter(item => !!processSrcMember(item, aBaseURL))
+      .map(toImageObject)
+      .forEach(image => images.push(image));
+  }
+  return images;
+
+  function toImageObject(aImageSpec) {
+    return {
+      'src': processSrcMember(aImageSpec, aBaseURL),
+      'type': processTypeMember(aImageSpec),
+      'sizes': processSizesMember(aImageSpec),
+    };
+  }
+
+  function processTypeMember(aImage) {
+    const charset = {};
+    const hadCharset = {};
+    const spec = {
+      objectName: 'image',
+      object: aImage,
+      property: 'type',
+      expectedType: 'string',
+      trim: true
+    };
+    let value = extractor.extractValue(spec);
+    if (value) {
+      value = netutil.parseRequestContentType(value, charset, hadCharset);
+    }
+    return value || undefined;
+  }
+
+  function processSrcMember(aImage, aBaseURL) {
+    const spec = {
+      objectName: 'image',
+      object: aImage,
+      property: 'src',
+      expectedType: 'string',
+      trim: false
+    };
+    const value = extractor.extractValue(spec);
+    let url;
+    if (value && value.length) {
+      try {
+        url = new URL(value, aBaseURL).href;
+      } catch (e) {}
+    }
+    return url;
+  }
+
+  function processSizesMember(aImage) {
+    const sizes = new Set();
+    const spec = {
+      objectName: 'image',
+      object: aImage,
+      property: 'sizes',
+      expectedType: 'string',
+      trim: true
+    };
+    const value = extractor.extractValue(spec);
+    if (value) {
+      // Split on whitespace and filter out invalid values.
+      value.split(/\s+/)
+        .filter(isValidSizeValue)
+        .reduce((collector, size) => collector.add(size), sizes);
+    }
+    return (sizes.size) ? Array.from(sizes).join(" ") : undefined;
+    // Implementation of HTML's link@size attribute checker.
+    function isValidSizeValue(aSize) {
+      const size = aSize.toLowerCase();
+      if (ImageObjectProcessor.anyRegEx.test(aSize)) {
+        return true;
+      }
+      if (!size.includes('x') || size.indexOf('x') !== size.lastIndexOf('x')) {
+        return false;
+      }
+      // Split left of x for width, after x for height.
+      const widthAndHeight = size.split('x');
+      const w = widthAndHeight.shift();
+      const h = widthAndHeight.join('x');
+      const validStarts = !w.startsWith('0') && !h.startsWith('0');
+      const validDecimals = ImageObjectProcessor.decimals.test(w + h);
+      return (validStarts && validDecimals);
+    }
+  }
+};
+this.ImageObjectProcessor = ImageObjectProcessor; // jshint ignore:line
+this.EXPORTED_SYMBOLS = ['ImageObjectProcessor']; // jshint ignore:line