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/utf_string_conversions.h"
  16 #include "base/values.h"
  17 #include "chrome/common/chrome_switches.h"
  18 #include "chrome/common/web_application_info.h"
  19 #include "grit/common_resources.h"
  20 #include "grit/generated_resources.h"
  21 #include "third_party/WebKit/public/platform/WebString.h"
  22 #include "third_party/WebKit/public/platform/WebURL.h"
  23 #include "third_party/WebKit/public/web/WebDocument.h"
  24 #include "third_party/WebKit/public/web/WebElement.h"
  25 #include "third_party/WebKit/public/web/WebFrame.h"
  26 #include "third_party/WebKit/public/web/WebNode.h"
  27 #include "third_party/WebKit/public/web/WebNodeList.h"
  28 #include "ui/base/l10n/l10n_util.h"
  29 #include "ui/base/resource/resource_bundle.h"
  30 #include "ui/gfx/size.h"
  31 #include "url/gurl.h"
  32
  33 using blink::WebDocument;
  34 using blink::WebElement;
  35 using blink::WebFrame;
  36 using blink::WebNode;
  37 using blink::WebNodeList;
  38 using blink::WebString;
  39
  40 namespace web_apps {
  41 namespace {
  42
  43 // Sizes a single size (the width or height) from a 'sizes' attribute. A size
  44 // matches must match the following regex: [1-9][0-9]*.
  45 int ParseSingleIconSize(const base::string16& text) {
  46   // Size must not start with 0, and be between 0 and 9.
  47   if (text.empty() || !(text[0] >= L'1' && text[0] <= L'9'))
  48     return 0;
  49
  50   // Make sure all chars are from 0-9.
  51   for (size_t i = 1; i < text.length(); ++i) {
  52     if (!(text[i] >= L'0' && text[i] <= L'9'))
  53       return 0;
  54   }
  55   int output;
  56   if (!base::StringToInt(text, &output))
  57     return 0;
  58   return output;
  59 }
  60
  61 // Parses an icon size. An icon size must match the following regex:
  62 // [1-9][0-9]*x[1-9][0-9]*.
  63 // If the input couldn't be parsed, a size with a width/height == 0 is returned.
  64 gfx::Size ParseIconSize(const base::string16& text) {
  65   std::vector<base::string16> sizes;
  66   base::SplitStringDontTrim(text, L'x', &sizes);
  67   if (sizes.size() != 2)
  68     return gfx::Size();
  69
  70   return gfx::Size(ParseSingleIconSize(sizes[0]),
  71                    ParseSingleIconSize(sizes[1]));
  72 }
  73
  74 void AddInstallIcon(const WebElement& link,
  75                     std::vector<WebApplicationInfo::IconInfo>* icons) {
  76   WebString href = link.getAttribute("href");
  77   if (href.isNull() || href.isEmpty())
  78     return;
  79
  80   // Get complete url.
  81   GURL url = link.document().completeURL(href);
  82   if (!url.is_valid())
  83     return;
  84
  85   WebApplicationInfo::IconInfo icon_info;
  86   bool is_any = false;
  87   std::vector<gfx::Size> icon_sizes;
  88   if (link.hasAttribute("sizes") &&
  89       ParseIconSizes(link.getAttribute("sizes"), &icon_sizes, &is_any) &&
  90       !is_any &&
  91       icon_sizes.size() == 1) {
  92     icon_info.width = icon_sizes[0].width();
  93     icon_info.height = icon_sizes[0].height();
  94   }
  95   icon_info.url = url;
  96   icons->push_back(icon_info);
  97 }
  98
  99 }  // namespace
 100
 101 bool ParseIconSizes(const base::string16& text,
 102                     std::vector<gfx::Size>* sizes,
 103                     bool* is_any) {
 104   *is_any = false;
 105   std::vector<base::string16> size_strings;
 106   base::SplitStringAlongWhitespace(text, &size_strings);
 107   for (size_t i = 0; i < size_strings.size(); ++i) {
 108     if (EqualsASCII(size_strings[i], "any")) {
 109       *is_any = true;
 110     } else {
 111       gfx::Size size = ParseIconSize(size_strings[i]);
 112       if (size.width() <= 0 || size.height() <= 0)
 113         return false;  // Bogus size.
 114       sizes->push_back(size);
 115     }
 116   }
 117   if (*is_any && !sizes->empty()) {
 118     // If is_any is true, it must occur by itself.
 119     return false;
 120   }
 121   return (*is_any || !sizes->empty());
 122 }
 123
 124 bool ParseWebAppFromWebDocument(WebFrame* frame,
 125                                 WebApplicationInfo* app_info,
 126                                 base::string16* error) {
 127   WebDocument document = frame->document();
 128   if (document.isNull())
 129     return true;
 130
 131   WebElement head = document.head();
 132   if (head.isNull())
 133     return true;
 134
 135   GURL document_url = document.url();
 136   WebNodeList children = head.childNodes();
 137   for (unsigned i = 0; i < children.length(); ++i) {
 138     WebNode child = children.item(i);
 139     if (!child.isElementNode())
 140       continue;
 141     WebElement elem = child.to<WebElement>();
 142
 143     if (elem.hasTagName("link")) {
 144       std::string rel = elem.getAttribute("rel").utf8();
 145       // "rel" attribute may use either "icon" or "shortcut icon".
 146       // see also
 147       //   <http://en.wikipedia.org/wiki/Favicon>
 148       //   <http://dev.w3.org/html5/spec/Overview.html#rel-icon>
 149       //
 150       // Streamlined Hosted Apps also support "apple-touch-icon" and
 151       // "apple-touch-icon-precomposed".
 152       if (LowerCaseEqualsASCII(rel, "icon") ||
 153           LowerCaseEqualsASCII(rel, "shortcut icon") ||
 154           (CommandLine::ForCurrentProcess()->
 155               HasSwitch(switches::kEnableStreamlinedHostedApps) &&
 156             (LowerCaseEqualsASCII(rel, "apple-touch-icon") ||
 157              LowerCaseEqualsASCII(rel, "apple-touch-icon-precomposed")))) {
 158         AddInstallIcon(elem, &app_info->icons);
 159       }
 160     } else if (elem.hasTagName("meta") && elem.hasAttribute("name")) {
 161       std::string name = elem.getAttribute("name").utf8();
 162       WebString content = elem.getAttribute("content");
 163       if (name == "application-name") {
 164         app_info->title = content;
 165       } else if (name == "description") {
 166         app_info->description = content;
 167       } else if (name == "application-url") {
 168         std::string url = content.utf8();
 169         app_info->app_url = document_url.is_valid() ?
 170             document_url.Resolve(url) : GURL(url);
 171         if (!app_info->app_url.is_valid())
 172           app_info->app_url = GURL();
 173       }
 174     }
 175   }
 176
 177   return true;
 178 }
 179
 180 }  // namespace web_apps