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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/browser/ui/webui/screenshot_source.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/file_util.h"
#include "base/memory/ref_counted_memory.h"
#include "base/message_loop.h"
#include "base/path_service.h"
#include "base/string16.h"
#include "base/string_util.h"
#include "chrome/browser/download/download_prefs.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/url_constants.h"
#include "googleurl/src/url_canon.h"
#include "googleurl/src/url_util.h"
#if defined(OS_CHROMEOS)
#include "ash/shell.h"
#include "ash/shell_delegate.h"
#include "content/public/browser/browser_thread.h"
#endif
static const char kCurrentScreenshotFilename[] = "current";
#if defined(OS_CHROMEOS)
static const char kSavedScreenshotsBasePath[] = "saved/";
#endif
ScreenshotSource::ScreenshotSource(
std::vector<unsigned char>* current_screenshot)
: DataSource(chrome::kChromeUIScreenshotPath, MessageLoop::current()) {
// Setup the last screenshot taken.
if (current_screenshot)
current_screenshot_.reset(new ScreenshotData(*current_screenshot));
else
current_screenshot_.reset(new ScreenshotData());
}
ScreenshotSource::~ScreenshotSource() {}
void ScreenshotSource::StartDataRequest(const std::string& path, bool,
int request_id) {
SendScreenshot(path, request_id);
}
std::string ScreenshotSource::GetMimeType(const std::string&) const {
// We need to explicitly return a mime type, otherwise if the user tries to
// drag the image they get no extension.
return "image/png";
}
ScreenshotDataPtr ScreenshotSource::GetCachedScreenshot(
const std::string& screenshot_path) {
std::map<std::string, ScreenshotDataPtr>::iterator pos;
std::string path = screenshot_path.substr(
0, screenshot_path.find_first_of("?"));
if ((pos = cached_screenshots_.find(path)) != cached_screenshots_.end()) {
return pos->second;
} else {
return ScreenshotDataPtr(new ScreenshotData);
}
}
void ScreenshotSource::SendScreenshot(const std::string& screenshot_path,
int request_id) {
// Strip the query param value - we only use it as a hack to ensure our
// image gets reloaded instead of being pulled from the browser cache
std::string path = screenshot_path.substr(
0, screenshot_path.find_first_of("?"));
if (path == kCurrentScreenshotFilename) {
CacheAndSendScreenshot(path, request_id, current_screenshot_);
#if defined(OS_CHROMEOS)
} else if (path.compare(0, strlen(kSavedScreenshotsBasePath),
kSavedScreenshotsBasePath) == 0) {
using content::BrowserThread;
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&ScreenshotSource::SendSavedScreenshot,
base::Unretained(this), path,
request_id));
#endif
} else {
CacheAndSendScreenshot(
path, request_id, ScreenshotDataPtr(new ScreenshotData()));
}
}
#if defined(OS_CHROMEOS)
void ScreenshotSource::SendSavedScreenshot(const std::string& screenshot_path,
int request_id) {
ScreenshotDataPtr read_bytes(new ScreenshotData);
std::string filename = screenshot_path.substr(
strlen(kSavedScreenshotsBasePath));
url_canon::RawCanonOutputT<char16> decoded;
url_util::DecodeURLEscapeSequences(
filename.data(), filename.size(), &decoded);
// Screenshot filenames don't use non-ascii characters.
std::string decoded_filename = UTF16ToASCII(string16(
decoded.data(), decoded.length()));
int64 file_size = 0;
DownloadPrefs* download_prefs = DownloadPrefs::FromBrowserContext(
ash::Shell::GetInstance()->delegate()->GetCurrentBrowserContext());
FilePath file = download_prefs->download_path().Append(decoded_filename);
if (!file_util::GetFileSize(file, &file_size)) {
CacheAndSendScreenshot(screenshot_path, request_id, read_bytes);
return;
}
read_bytes->resize(file_size);
if (!file_util::ReadFile(file, reinterpret_cast<char*>(&read_bytes->front()),
static_cast<int>(file_size)))
read_bytes->clear();
CacheAndSendScreenshot(screenshot_path, request_id, read_bytes);
}
#endif
void ScreenshotSource::CacheAndSendScreenshot(
const std::string& screenshot_path,
int request_id,
ScreenshotDataPtr bytes) {
cached_screenshots_[screenshot_path] = bytes;
SendResponse(request_id, new base::RefCountedBytes(*bytes));
}
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