Backed out changeset 1008f5b88e6b (bug 1270742) for failing browser_ext_browserAction_context.js. r=backout

browser/components/extensions/ext-utils.js

@@ -8,21 +8,138 @@ XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
                                   "resource://gre/modules/PrivateBrowsingUtils.jsm");
 
 Cu.import("resource://gre/modules/ExtensionUtils.jsm");
+Cu.import("resource://gre/modules/AddonManager.jsm");
 Cu.import("resource://gre/modules/AppConstants.jsm");
 
 const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-
+const INTEGER = /^[1-9]\d*$/;
 // Minimum time between two resizes.
 const RESIZE_TIMEOUT = 100;
 
 var {
   EventManager,
+  instanceOf,
 } = ExtensionUtils;
 
 // This file provides some useful code for the |tabs| and |windows|
 // modules. All of the code is installed on |global|, which is a scope
 // shared among the different ext-*.js scripts.
 
+
+// Manages icon details for toolbar buttons in the |pageAction| and
+// |browserAction| APIs.
+global.IconDetails = {
+  // Normalizes the various acceptable input formats into an object
+  // with icon size as key and icon URL as value.
+  //
+  // If a context is specified (function is called from an extension):
+  // Throws an error if an invalid icon size was provided or the
+  // extension is not allowed to load the specified resources.
+  //
+  // If no context is specified, instead of throwing an error, this
+  // function simply logs a warning message.
+  normalize(details, extension, context = null) {
+    let result = {};
+
+    try {
+      if (details.imageData) {
+        let imageData = details.imageData;
+
+        // The global might actually be from Schema.jsm, which
+        // normalizes most of our arguments. In that case it won't have
+        // an ImageData property. But Schema.jsm doesn't normalize
+        // actual ImageData objects, so they will come from a global
+        // with the right property.
+        if (instanceOf(imageData, "ImageData")) {
+          imageData = {"19": imageData};
+        }
+
+        for (let size of Object.keys(imageData)) {
+          if (!INTEGER.test(size)) {
+            throw new Error(`Invalid icon size ${size}, must be an integer`);
+          }
+          result[size] = this.convertImageDataToPNG(imageData[size], context);
+        }
+      }
+
+      if (details.path) {
+        let path = details.path;
+        if (typeof path != "object") {
+          path = {"19": path};
+        }
+
+        let baseURI = context ? context.uri : extension.baseURI;
+
+        for (let size of Object.keys(path)) {
+          if (!INTEGER.test(size)) {
+            throw new Error(`Invalid icon size ${size}, must be an integer`);
+          }
+
+          let url = baseURI.resolve(path[size]);
+
+          // The Chrome documentation specifies these parameters as
+          // relative paths. We currently accept absolute URLs as well,
+          // which means we need to check that the extension is allowed
+          // to load them. This will throw an error if it's not allowed.
+          Services.scriptSecurityManager.checkLoadURIStrWithPrincipal(
+            extension.principal, url,
+            Services.scriptSecurityManager.DISALLOW_SCRIPT);
+
+          result[size] = url;
+        }
+      }
+    } catch (e) {
+      // Function is called from extension code, delegate error.
+      if (context) {
+        throw e;
+      }
+      // If there's no context, it's because we're handling this
+      // as a manifest directive. Log a warning rather than
+      // raising an error.
+      extension.manifestError(`Invalid icon data: ${e}`);
+    }
+
+    return result;
+  },
+
+  // Returns the appropriate icon URL for the given icons object and the
+  // screen resolution of the given window.
+  getURL(icons, window, extension, size = 16) {
+    const DEFAULT = "chrome://browser/content/extension.svg";
+
+    size *= window.devicePixelRatio;
+
+    let bestSize = null;
+    if (icons[size]) {
+      bestSize = size;
+    } else if (icons[2 * size]) {
+      bestSize = 2 * size;
+    } else {
+      let sizes = Object.keys(icons)
+                        .map(key => parseInt(key, 10))
+                        .sort((a, b) => a - b);
+
+      bestSize = sizes.find(candidate => candidate > size) || sizes.pop();
+    }
+
+    if (bestSize) {
+      return {size: bestSize, icon: icons[bestSize]};
+    }
+
+    return {size, icon: DEFAULT};
+  },
+
+  convertImageDataToPNG(imageData, context) {
+    let document = context.contentWindow.document;
+    let canvas = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
+    canvas.width = imageData.width;
+    canvas.height = imageData.height;
+    canvas.getContext("2d").putImageData(imageData, 0, 0);
+
+    return canvas.toDataURL("image/png");
+  },
+};
+
 global.makeWidgetId = id => {
   id = id.toLowerCase();
   // FIXME: This allows for collisions.