chrome/renderer/web_apps.cc

   1 // Copyright (c) 2012 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 #include "chrome/renderer/web_apps.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/command_line.h"
  11 #include "base/json/json_reader.h"
  12 #include "base/strings/string16.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/string_split.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/values.h"
  18 #include "chrome/common/chrome_switches.h"
  19 #include "chrome/common/web_application_info.h"
  20 #include "third_party/WebKit/public/platform/WebString.h"
  21 #include "third_party/WebKit/public/platform/WebURL.h"
  22 #include "third_party/WebKit/public/web/WebDocument.h"
  23 #include "third_party/WebKit/public/web/WebElement.h"
  24 #include "third_party/WebKit/public/web/WebFrame.h"
  25 #include "third_party/WebKit/public/web/WebNode.h"
  26 #include "third_party/WebKit/public/web/WebNodeList.h"
  27 #include "ui/gfx/size.h"
  28 #include "url/gurl.h"
  29
  30 using blink::WebDocument;
  31 using blink::WebElement;
  32 using blink::WebFrame;
  33 using blink::WebNode;
  34 using blink::WebNodeList;
  35 using blink::WebString;
  36
  37 namespace web_apps {
  38 namespace {
  39
  40 // Sizes a single size (the width or height) from a 'sizes' attribute. A size
  41 // matches must match the following regex: [1-9][0-9]*.
  42 int ParseSingleIconSize(const base::string16& text) {
  43   // Size must not start with 0, and be between 0 and 9.
  44   if (text.empty() || !(text[0] >= L'1' && text[0] <= L'9'))
  45     return 0;
  46
  47   // Make sure all chars are from 0-9.
  48   for (size_t i = 1; i < text.length(); ++i) {
  49     if (!(text[i] >= L'0' && text[i] <= L'9'))
  50       return 0;
  51   }
  52   int output;
  53   if (!base::StringToInt(text, &output))
  54     return 0;
  55   return output;
  56 }
  57
  58 // Parses an icon size. An icon size must match the following regex:
  59 // [1-9][0-9]*x[1-9][0-9]*.
  60 // If the input couldn't be parsed, a size with a width/height == 0 is returned.
  61 gfx::Size ParseIconSize(const base::string16& text) {
  62   std::vector<base::string16> sizes;
  63   base::SplitStringDontTrim(text, L'x', &sizes);
  64   if (sizes.size() != 2)
  65     return gfx::Size();
  66
  67   return gfx::Size(ParseSingleIconSize(sizes[0]),
  68                    ParseSingleIconSize(sizes[1]));
  69 }
  70
  71 void AddInstallIcon(const WebElement& link,
  72                     std::vector<WebApplicationInfo::IconInfo>* icons) {
  73   WebString href = link.getAttribute("href");
  74   if (href.isNull() || href.isEmpty())
  75     return;
  76
  77   // Get complete url.
  78   GURL url = link.document().completeURL(href);
  79   if (!url.is_valid())
  80     return;
  81
  82   WebApplicationInfo::IconInfo icon_info;
  83   bool is_any = false;
  84   std::vector<gfx::Size> icon_sizes;
  85   if (link.hasAttribute("sizes") &&
  86       ParseIconSizes(link.getAttribute("sizes"), &icon_sizes, &is_any) &&
  87       !is_any &&
  88       icon_sizes.size() == 1) {
  89     icon_info.width = icon_sizes[0].width();
  90     icon_info.height = icon_sizes[0].height();
  91   }
  92   icon_info.url = url;
  93   icons->push_back(icon_info);
  94 }
  95
  96 }  // namespace
  97
  98 bool ParseIconSizes(const base::string16& text,
  99                     std::vector<gfx::Size>* sizes,
 100                     bool* is_any) {
 101   *is_any = false;
 102   std::vector<base::string16> size_strings;
 103   base::SplitStringAlongWhitespace(text, &size_strings);
 104   for (size_t i = 0; i < size_strings.size(); ++i) {
 105     if (EqualsASCII(size_strings[i], "any")) {
 106       *is_any = true;
 107     } else {
 108       gfx::Size size = ParseIconSize(size_strings[i]);
 109       if (size.width() <= 0 || size.height() <= 0)
 110         return false;  // Bogus size.
 111       sizes->push_back(size);
 112     }
 113   }
 114   if (*is_any && !sizes->empty()) {
 115     // If is_any is true, it must occur by itself.
 116     return false;
 117   }
 118   return (*is_any || !sizes->empty());
 119 }
 120
 121 void ParseWebAppFromWebDocument(WebFrame* frame,
 122                                 WebApplicationInfo* app_info) {
 123   WebDocument document = frame->document();
 124   if (document.isNull())
 125     return;
 126
 127   WebElement head = document.head();
 128   if (head.isNull())
 129     return;
 130
 131   GURL document_url = document.url();
 132   WebNodeList children = head.childNodes();
 133   for (unsigned i = 0; i < children.length(); ++i) {
 134     WebNode child = children.item(i);
 135     if (!child.isElementNode())
 136       continue;
 137     WebElement elem = child.to<WebElement>();
 138
 139     if (elem.hasHTMLTagName("link")) {
 140       std::string rel = elem.getAttribute("rel").utf8();
 141       // "rel" attribute may use either "icon" or "shortcut icon".
 142       // see also
 143       //   <http://en.wikipedia.org/wiki/Favicon>
 144       //   <http://dev.w3.org/html5/spec/Overview.html#rel-icon>
 145       //
 146       // Streamlined Hosted Apps also support "apple-touch-icon" and
 147       // "apple-touch-icon-precomposed".
 148       if (LowerCaseEqualsASCII(rel, "icon") ||
 149           LowerCaseEqualsASCII(rel, "shortcut icon") ||
 150           (CommandLine::ForCurrentProcess()->
 151               HasSwitch(switches::kEnableStreamlinedHostedApps) &&
 152             (LowerCaseEqualsASCII(rel, "apple-touch-icon") ||
 153              LowerCaseEqualsASCII(rel, "apple-touch-icon-precomposed")))) {
 154         AddInstallIcon(elem, &app_info->icons);
 155       }
 156     } else if (elem.hasHTMLTagName("meta") && elem.hasAttribute("name")) {
 157       std::string name = elem.getAttribute("name").utf8();
 158       WebString content = elem.getAttribute("content");
 159       if (name == "application-name") {
 160         app_info->title = content;
 161       } else if (name == "description") {
 162         app_info->description = content;
 163       } else if (name == "application-url") {
 164         std::string url = content.utf8();
 165         app_info->app_url = document_url.is_valid() ?
 166             document_url.Resolve(url) : GURL(url);
 167         if (!app_info->app_url.is_valid())
 168           app_info->app_url = GURL();
 169       } else if (name == "mobile-web-app-capable" &&
 170                  LowerCaseEqualsASCII(content, "yes")) {
 171         app_info->mobile_capable = WebApplicationInfo::MOBILE_CAPABLE;
 172       } else if (name == "apple-mobile-web-app-capable" &&
 173                  LowerCaseEqualsASCII(content, "yes") &&
 174                  app_info->mobile_capable ==
 175                      WebApplicationInfo::MOBILE_CAPABLE_UNSPECIFIED) {
 176         app_info->mobile_capable = WebApplicationInfo::MOBILE_CAPABLE_APPLE;
 177       }
 178     }
 179   }
 180 }
 181
 182 }  // namespace web_apps