Add ErrorConsole UI for Extension Install Warnings

chrome/browser/resources/extensions/extension_error.js

+// Copyright 2013 The Chromium Authors. All rights reserved.

[Yoyo Zhou, 2013/08/16 00:17:26]

P.S. You might want to find a qualified Javascript reviewer for this.

[Devlin, 2013/08/16 18:07:49]

Yep :)  I'm gonna run c/b/r/e and c/b/ui/webui by OWNERS; just making sure that
nothing needs to be completely restructured first.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+cr.define('extensions', function() {
+  'use strict';
+
+  /**
+   * Returns whether or not a given |link| is associated with an extension.

[Yoyo Zhou, 2013/08/16 00:17:26]

Why use 'link' here when you are referring to URLs? 'url' would be clearer.

[Devlin, 2013/08/16 18:07:49]

My thinking was that things like "manifest.json" or even "event_bindings" aren't
really urls.  But I guess "link" isn't any better.  Changed.

+   * @param {string} link The link to examine.
+   * @param {string} extensionUrl The url of the extension.
+   * @return {boolean} Whether or not the link is prefixed by the prefix.
+   */
+  function isExtensionLink(link, extensionUrl) {
+    return link.substring(0, extensionUrl.length) === extensionUrl;
+  }
+
+  /**
+   * Get the link relative to the main extension url. If the link is
+   * unassociated with the extension, this will be the full link.
+   * @param {link} The link to make relative.
+   * @param {extensionUrl} The host for which the link is relative.
+   * @return {string} The link relative to the host.
+   */
+  function getRelativeLink(link, extensionUrl) {

[Yoyo Zhou, 2013/08/16 00:17:26]

Same here - I would call this getRelativePath(url, extensionUrl)

[Devlin, 2013/08/16 18:07:49]

Done.

+    return isExtensionLink(link, extensionUrl) ?
+        link.substring(extensionUrl.length) : link;
+  }
+
+  /**
+   * Clone a template within the extension error template collection.
+   * @param {string} templateName The class name of the template to clone.
+   * @return {HTMLElement} The clone of the template.
+   */
+  function cloneTemplate(templateName) {
+    return $('template-collection-extension-error')
+        .querySelector(templateName).cloneNode(true);
+  }
+
+  /**
+   * Creates a new ExtensionError HTMLElement.
+   * @param {Object} error The error the element should represent.
+   * @return {HTMLElement} The created error element.
+   */
+  function ExtensionError(error) {
+    var div = document.createElement('div');
+    div.__proto__ = ExtensionError.prototype;
+    div.className = 'extension-error-simple-wrapper';
+    div.error_ = error;
+    div.decorate();
+    return div;
+  }
+
+  ExtensionError.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    /** @override */
+    decorate: function() {
+      var metadata = cloneTemplate('.extension-error-metadata');
+
+      // Set an icon for the level of severity...
+      var iconNode = metadata.querySelector('img');
+      iconNode.className =
+          this.error_.level == 0 ? 'extension-error-icon-log' :
+          this.error_.level == 1 ? 'extension-error-icon-warn' :
+                                   'extension-error-icon-error';
+
+      // Add a property for the extension's base url in order to determine if
+      // a link belongs to the extension.
+      this.extensionUrl_ =
+          'chrome-extension://' + this.error_.extensionId + '/';
+
+      // The error message...
+      metadata.querySelector('.extension-error-message').innerText =
+          this.error_.message;
+
+      // The error source...
+      metadata.querySelector('.extension-error-source').innerText =
+          '(' + getRelativeLink(this.error_.source, this.extensionUrl_) + ')';
+
+      this.appendChild(metadata);
+      this.addViewLinkToNode_(this, this.error_.source);
+    },
+
+    /**
+     * Add a "view" link to the given node, if a user can view the source of the
+     * specified link.
+     * @param {HTMLElement} node The node to which we append the view link.
+     * @param {string} link The link to the resource to view.
+     */
+    addViewLinkToNode_: function(node, link) {
+      if (this.canViewSource_(link))
+        node.appendChild(this.getViewSourceLink_(link));
+    },
+
+    /**
+     * Determine whether we can view the source of a given link.
+     * @param {string} link The link to the resource to view.
+     * @return {boolean} Whether or not we can view the source for the link.
+     */
+    canViewSource_: function(link) {
+      return isExtensionLink(link, this.extensionUrl_) ||
+             link === 'manifest.json';
+    },
+
+    /**
+     * Create a clickable node to view the source for the given link.
+     * @param {string} link The link t othe resource to view.
+     * @return {HTMLElement} The clickable node to view the source.
+     */
+    getViewSourceLink_: function(link) {
+      var node = document.createElement('a');
+      node.innerText = loadTimeData.getString('extensionErrorViewSource');
+
+      var relativeLink = getRelativeLink(link, this.extensionUrl_);
+      node.addEventListener('click', function(e) {
+        chrome.send('extensionErrorRequestFileSource',
+                    [{
+                        'extensionId': this.error_.extensionId,
+                        'errorMessage': this.error_.message,
+                        'fileType': 'manifest',
+                        'pathSuffix': relativeLink,
+                        'feature': this.error_.manifestKey,
+                        'specific': this.error_.manifestSpecific
+                     }]);
+      }.bind(this));
+      return node;
+    }
+  };
+
+  function ExtensionErrorList(errors) {
+    var div = cloneTemplate('.extension-error-list');
+    div.__proto__ = ExtensionErrorList.prototype;
+    div.errors_ = errors;
+    div.decorate();
+    return div;
+  }
+
+  ExtensionErrorList.prototype = {
+    __proto__: HTMLDivElement.prototype,
+
+    kMaxErrorsToShow_: 3,
+
+    /** @override */
+    decorate: function() {
+      this.contents_ = this.querySelector('.extension-error-list-contents');
+      this.errors_.forEach(function(error) {
+        this.contents_.appendChild(document.createElement('li')).appendChild(
+            new ExtensionError(error));
+      }.bind(this));
+
+      if (this.contents_.children.length > this.kMaxErrorsToShow_) {
+        for (var i = this.kMaxErrorsToShow_;
+             i < this.contents_.children.length; ++i)
+          this.contents_.children[i].hidden = true;
+        this.initShowMoreButton_();
+      }
+    },
+
+    initShowMoreButton_: function() {
+      var button = this.querySelector('.extension-error-list-show-more')
+                       .querySelector('a');
+      button.hidden = false;
+      button.isShowingAll = false;
+      button.addEventListener('click', function(e) {
+        if (button.isShowingAll) {
+          for (var i = this.kMaxErrorsToShow_;
+               i < this.contents_.children.length; ++i) {
+            this.contents_.children[i].hidden = true;
+          }
+          button.innerText = loadTimeData.getString('extensionErrorsShowMore');
+        } else {
+          for (var i = this.kMaxErrorsToShow_;
+               i < this.contents_.children.length; ++i) {
+            this.contents_.children[i].hidden = false;
+          }
+          button.innerText = loadTimeData.getString('extensionErrorsShowFewer');
+        }
+
+        button.isShowingAll = !button.isShowingAll;
+      }.bind(this));
+    }
+  };
+
+  return {
+    ExtensionErrorList: ExtensionErrorList
+  };
+});