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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/web_apps.h"
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/json/json_reader.h"
#include "base/strings/string16.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/web_application_info.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/platform/WebURL.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebNode.h"
#include "third_party/WebKit/public/web/WebNodeList.h"
#include "ui/gfx/size.h"
#include "url/gurl.h"
using blink::WebDocument;
using blink::WebElement;
using blink::WebFrame;
using blink::WebNode;
using blink::WebNodeList;
using blink::WebString;
namespace web_apps {
namespace {
// Sizes a single size (the width or height) from a 'sizes' attribute. A size
// matches must match the following regex: [1-9][0-9]*.
int ParseSingleIconSize(const base::string16& text) {
// Size must not start with 0, and be between 0 and 9.
if (text.empty() || !(text[0] >= L'1' && text[0] <= L'9'))
return 0;
// Make sure all chars are from 0-9.
for (size_t i = 1; i < text.length(); ++i) {
if (!(text[i] >= L'0' && text[i] <= L'9'))
return 0;
}
int output;
if (!base::StringToInt(text, &output))
return 0;
return output;
}
// Parses an icon size. An icon size must match the following regex:
// [1-9][0-9]*x[1-9][0-9]*.
// If the input couldn't be parsed, a size with a width/height == 0 is returned.
gfx::Size ParseIconSize(const base::string16& text) {
std::vector<base::string16> sizes;
base::SplitStringDontTrim(text, L'x', &sizes);
if (sizes.size() != 2)
return gfx::Size();
return gfx::Size(ParseSingleIconSize(sizes[0]),
ParseSingleIconSize(sizes[1]));
}
void AddInstallIcon(const WebElement& link,
std::vector<WebApplicationInfo::IconInfo>* icons) {
WebString href = link.getAttribute("href");
if (href.isNull() || href.isEmpty())
return;
// Get complete url.
GURL url = link.document().completeURL(href);
if (!url.is_valid())
return;
WebApplicationInfo::IconInfo icon_info;
bool is_any = false;
std::vector<gfx::Size> icon_sizes;
if (link.hasAttribute("sizes") &&
ParseIconSizes(link.getAttribute("sizes"), &icon_sizes, &is_any) &&
!is_any &&
icon_sizes.size() == 1) {
icon_info.width = icon_sizes[0].width();
icon_info.height = icon_sizes[0].height();
}
icon_info.url = url;
icons->push_back(icon_info);
}
} // namespace
bool ParseIconSizes(const base::string16& text,
std::vector<gfx::Size>* sizes,
bool* is_any) {
*is_any = false;
std::vector<base::string16> size_strings;
base::SplitStringAlongWhitespace(text, &size_strings);
for (size_t i = 0; i < size_strings.size(); ++i) {
if (EqualsASCII(size_strings[i], "any")) {
*is_any = true;
} else {
gfx::Size size = ParseIconSize(size_strings[i]);
if (size.width() <= 0 || size.height() <= 0)
return false; // Bogus size.
sizes->push_back(size);
}
}
if (*is_any && !sizes->empty()) {
// If is_any is true, it must occur by itself.
return false;
}
return (*is_any || !sizes->empty());
}
bool ParseWebAppFromWebDocument(WebFrame* frame,
WebApplicationInfo* app_info,
base::string16* error) {
WebDocument document = frame->document();
if (document.isNull())
return true;
WebElement head = document.head();
if (head.isNull())
return true;
GURL document_url = document.url();
WebNodeList children = head.childNodes();
for (unsigned i = 0; i < children.length(); ++i) {
WebNode child = children.item(i);
if (!child.isElementNode())
continue;
WebElement elem = child.to<WebElement>();
if (elem.hasHTMLTagName("link")) {
std::string rel = elem.getAttribute("rel").utf8();
// "rel" attribute may use either "icon" or "shortcut icon".
// see also
// <http://en.wikipedia.org/wiki/Favicon>
// <http://dev.w3.org/html5/spec/Overview.html#rel-icon>
//
// Streamlined Hosted Apps also support "apple-touch-icon" and
// "apple-touch-icon-precomposed".
if (LowerCaseEqualsASCII(rel, "icon") ||
LowerCaseEqualsASCII(rel, "shortcut icon") ||
(CommandLine::ForCurrentProcess()->
HasSwitch(switches::kEnableStreamlinedHostedApps) &&
(LowerCaseEqualsASCII(rel, "apple-touch-icon") ||
LowerCaseEqualsASCII(rel, "apple-touch-icon-precomposed")))) {
AddInstallIcon(elem, &app_info->icons);
}
} else if (elem.hasHTMLTagName("meta") && elem.hasAttribute("name")) {
std::string name = elem.getAttribute("name").utf8();
WebString content = elem.getAttribute("content");
if (name == "application-name") {
app_info->title = content;
} else if (name == "description") {
app_info->description = content;
} else if (name == "application-url") {
std::string url = content.utf8();
app_info->app_url = document_url.is_valid() ?
document_url.Resolve(url) : GURL(url);
if (!app_info->app_url.is_valid())
app_info->app_url = GURL();
}
}
}
return true;
}
} // namespace web_apps
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