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      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
    183