chrome/browser/resources/local_ntp/most_visited_util.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5
   6 /**
   7  * @fileoverview Utilities for rendering most visited thumbnails and titles.
   8  */
   9
  10 <include src="instant_iframe_validation.js">
  11
  12 /**
  13  * The different types of events that are logged from the NTP.  This enum is
  14  * used to transfer information from the NTP javascript to the renderer and is
  15  * not used as a UMA enum histogram's logged value.
  16  * Note: Keep in sync with common/ntp_logging_events.h
  17  * @enum {number}
  18  * @const
  19  */
  20 var NTP_LOGGING_EVENT_TYPE = {
  21   // The suggestion is coming from the server.
  22   NTP_SERVER_SIDE_SUGGESTION: 0,
  23   // The suggestion is coming from the client.
  24   NTP_CLIENT_SIDE_SUGGESTION: 1,
  25   // Indicates a tile was rendered, no matter if it's a thumbnail, a gray tile
  26   // or an external tile.
  27   NTP_TILE: 2,
  28   // The tile uses a local thumbnail image.
  29   NTP_THUMBNAIL_TILE: 3,
  30   // Used when no thumbnail is specified and a gray tile with the domain is used
  31   // as the main tile.
  32   NTP_GRAY_TILE: 4,
  33   // The visuals of that tile are handled externally by the page itself.
  34   NTP_EXTERNAL_TILE: 5,
  35   // There was an error in loading both the thumbnail image and the fallback
  36   // (if it was provided), resulting in a grey tile.
  37   NTP_THUMBNAIL_ERROR: 6,
  38   // Used a gray tile with the domain as the fallback for a failed thumbnail.
  39   NTP_GRAY_TILE_FALLBACK: 7,
  40   // The visuals of that tile's fallback are handled externally.
  41   NTP_EXTERNAL_TILE_FALLBACK: 8,
  42   // The user moused over an NTP tile or title.
  43   NTP_MOUSEOVER: 9
  44 };
  45
  46 /**
  47  * Type of the impression provider for a generic client-provided suggestion.
  48  * @type {string}
  49  * @const
  50  */
  51 var CLIENT_PROVIDER_NAME = 'client';
  52
  53 /**
  54  * Type of the impression provider for a generic server-provided suggestion.
  55  * @type {string}
  56  * @const
  57  */
  58 var SERVER_PROVIDER_NAME = 'server';
  59
  60 /**
  61  * Parses query parameters from Location.
  62  * @param {string} location The URL to generate the CSS url for.
  63  * @return {Object} Dictionary containing name value pairs for URL.
  64  */
  65 function parseQueryParams(location) {
  66   var params = Object.create(null);
  67   var query = location.search.substring(1);
  68   var vars = query.split('&');
  69   for (var i = 0; i < vars.length; i++) {
  70     var pair = vars[i].split('=');
  71     var k = decodeURIComponent(pair[0]);
  72     if (k in params) {
  73       // Duplicate parameters are not allowed to prevent attackers who can
  74       // append things to |location| from getting their parameter values to
  75       // override legitimate ones.
  76       return Object.create(null);
  77     } else {
  78       params[k] = decodeURIComponent(pair[1]);
  79     }
  80   }
  81   return params;
  82 }
  83
  84
  85 /**
  86  * Creates a new most visited link element.
  87  * @param {Object} params URL parameters containing styles for the link.
  88  * @param {string} href The destination for the link.
  89  * @param {string} title The title for the link.
  90  * @param {string|undefined} text The text for the link or none.
  91  * @param {string|undefined} ping If specified, a location relative to the
  92  *     referrer of this iframe, to ping when the link is clicked. Only works if
  93  *     the referrer is HTTPS.
  94  * @param {string|undefined} provider A provider name (max 8 alphanumeric
  95  *     characters) used for logging. Undefined if suggestion is not coming from
  96  *     the server.
  97  * @return {HTMLAnchorElement} A new link element.
  98  */
  99 function createMostVisitedLink(params, href, title, text, ping, provider) {
 100   var styles = getMostVisitedStyles(params, !!text);
 101   var link = document.createElement('a');
 102   link.style.color = styles.color;
 103   link.style.fontSize = styles.fontSize + 'px';
 104   if (styles.fontFamily)
 105     link.style.fontFamily = styles.fontFamily;
 106   link.href = href;
 107   if ('pos' in params && isFinite(params.pos)) {
 108     link.ping = '/log.html?pos=' + params.pos;
 109     if (provider)
 110       link.ping += '&pr=' + provider;
 111     // If a ping parameter was specified, add it to the list of pings, relative
 112     // to the referrer of this iframe, which is the default search provider.
 113     if (ping) {
 114       var parentUrl = document.createElement('a');
 115       parentUrl.href = document.referrer;
 116       if (parentUrl.protocol == 'https:') {
 117         link.ping += ' ' + parentUrl.origin + '/' + ping;
 118       }
 119     }
 120   }
 121   link.title = title;
 122   link.target = '_top';
 123   // Exclude links from the tab order.  The tabIndex is added to the thumbnail
 124   // parent container instead.
 125   link.tabIndex = '-1';
 126   if (text)
 127     link.textContent = text;
 128   link.addEventListener('mouseover', function() {
 129     var ntpApiHandle = chrome.embeddedSearch.newTabPage;
 130     ntpApiHandle.logEvent(NTP_LOGGING_EVENT_TYPE.NTP_MOUSEOVER);
 131   });
 132   return link;
 133 }
 134
 135
 136 /**
 137  * Decodes most visited styles from URL parameters.
 138  * - f: font-family
 139  * - fs: font-size as a number in pixels.
 140  * - c: A hexadecimal number interpreted as a hex color code.
 141  * @param {Object.<string, string>} params URL parameters specifying style.
 142  * @param {boolean} isTitle if the style is for the Most Visited Title.
 143  * @return {Object} Styles suitable for CSS interpolation.
 144  */
 145 function getMostVisitedStyles(params, isTitle) {
 146   var styles = {
 147     color: '#777',
 148     fontFamily: '',
 149     fontSize: 11
 150   };
 151   var apiHandle = chrome.embeddedSearch.newTabPage;
 152   var themeInfo = apiHandle.themeBackgroundInfo;
 153   if (isTitle && themeInfo && !themeInfo.usingDefaultTheme) {
 154     styles.color = convertArrayToRGBAColor(themeInfo.textColorRgba) ||
 155         styles.color;
 156   } else if ('c' in params) {
 157     styles.color = convertToHexColor(parseInt(params.c, 16)) || styles.color;
 158   }
 159   if ('f' in params && /^[-0-9a-zA-Z ,]+$/.test(params.f))
 160     styles.fontFamily = params.f;
 161   if ('fs' in params && isFinite(parseInt(params.fs, 10)))
 162     styles.fontSize = parseInt(params.fs, 10);
 163   return styles;
 164 }
 165
 166
 167 /**
 168  * @param {string} location A location containing URL parameters.
 169  * @param {function(Object, Object)} fill A function called with styles and
 170  *     data to fill.
 171  */
 172 function fillMostVisited(location, fill) {
 173   var params = parseQueryParams(document.location);
 174   params.rid = parseInt(params.rid, 10);
 175   if (!isFinite(params.rid) && !params.url)
 176     return;
 177   // Log whether the suggestion was obtained from the server or the client.
 178   chrome.embeddedSearch.newTabPage.logEvent(params.url ?
 179       NTP_LOGGING_EVENT_TYPE.NTP_SERVER_SIDE_SUGGESTION :
 180       NTP_LOGGING_EVENT_TYPE.NTP_CLIENT_SIDE_SUGGESTION);
 181   var data = {};
 182   if (params.url) {
 183     // Means that the suggestion data comes from the server. Create data object.
 184     data.url = params.url;
 185     data.thumbnailUrl = params.tu || '';
 186     data.title = params.ti || '';
 187     data.direction = params.di || '';
 188     data.domain = params.dom || '';
 189     data.ping = params.ping || '';
 190     data.provider = params.pr || SERVER_PROVIDER_NAME;
 191
 192     // Log the fact that suggestion was obtained from the server.
 193     var ntpApiHandle = chrome.embeddedSearch.newTabPage;
 194     ntpApiHandle.logEvent(NTP_LOGGING_EVENT_TYPE.NTP_SERVER_SIDE_SUGGESTION);
 195   } else {
 196     var apiHandle = chrome.embeddedSearch.searchBox;
 197     data = apiHandle.getMostVisitedItemData(params.rid);
 198     if (!data)
 199       return;
 200     data.provider = CLIENT_PROVIDER_NAME;
 201     delete data.ping;
 202   }
 203   if (/^javascript:/i.test(data.url) ||
 204       /^javascript:/i.test(data.thumbnailUrl) ||
 205       !/^[a-z0-9]{0,8}$/i.test(data.provider))
 206     return;
 207   if (data.direction)
 208     document.body.dir = data.direction;
 209   fill(params, data);
 210 }