fchost_handler.cc

// Copyright (c) 2013 The Chromium Embedded Framework 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 "fchost_handler.h"

#include <sstream>
#include <string>
#include <fstream>

#include "include/base/cef_bind.h"
#include "include/base/cef_callback.h"
#include "include/cef_app.h"
#include "include/cef_parser.h"
#include "include/views/cef_browser_view.h"
#include "include/views/cef_window.h"
#include "include/wrapper/cef_closure_task.h"
#include "include/wrapper/cef_helpers.h"

namespace {

FCHostHandler* g_instance = NULL;

// Returns a data: URI with the specified contents.
std::string GetDataURI(const std::string& data, const std::string& mime_type) {
    return "data:" + mime_type + ";base64," +
        CefURIEncode(CefBase64Encode(data.data(), data.size()), false)
        .ToString();
}

}  // namespace

FCHostHandler::FCHostHandler(bool use_views)
    : use_views_(use_views), is_closing_(false) {
  DCHECK(!g_instance);
  g_instance = this;
}

FCHostHandler::~FCHostHandler() {
  g_instance = NULL;
}

// static
FCHostHandler* FCHostHandler::GetInstance() {
  return g_instance;
}

void FCHostHandler::OnTitleChange(CefRefPtr<CefBrowser> browser,
                                  const CefString& title) {
  CEF_REQUIRE_UI_THREAD();

  if (use_views_) {
    // Set the title of the window using the Views framework.
    CefRefPtr<CefBrowserView> browser_view =
        CefBrowserView::GetForBrowser(browser);
    if (browser_view) {
      CefRefPtr<CefWindow> window = browser_view->GetWindow();
      if (window)
        window->SetTitle(title);
    }
  } else {
    // Set the title of the window using platform APIs.
    PlatformTitleChange(browser, title);
  }
}

static std::string DateTime()
{
	time_t rawtime;
	struct tm* timeInfo;
	char buffer[80];

	time(&rawtime);
	timeInfo = localtime(&rawtime);

	strftime(buffer, 80, "%Y-%m-%d %I:%M:%S", timeInfo);

	return std::string(buffer);
}

bool FCHostHandler::OnConsoleMessage(CefRefPtr<CefBrowser> browser, cef_log_severity_t level,
									 const CefString& message, const CefString& source, int line)
{
	std::ofstream s("console.log", std::ios_base::app);
	s << DateTime() << " - ";
    if (!source.empty()) {
        s << source.c_str();
    } else {
        s << "Unknown Source";
    }
    s << ":" << line << ": " << message.c_str() << "\n";

	return false;
}

void FCHostHandler::OnAfterCreated(CefRefPtr<CefBrowser> browser) {
  CEF_REQUIRE_UI_THREAD();

  // Add to the list of existing browsers.
  browser_list_.push_back(browser);
}

bool FCHostHandler::DoClose(CefRefPtr<CefBrowser> browser) {
  CEF_REQUIRE_UI_THREAD();

  // Closing the main window requires special handling. See the DoClose()
  // documentation in the CEF header for a detailed destription of this
  // process.
  if (browser_list_.size() == 1) {
    // Set a flag to indicate that the window close should be allowed.
    is_closing_ = true;
  }

  // Allow the close. For windowed browsers this will result in the OS close
  // event being sent.
  return false;
}

void FCHostHandler::OnBeforeClose(CefRefPtr<CefBrowser> browser) {
  CEF_REQUIRE_UI_THREAD();

  // Remove from the list of existing browsers.
  BrowserList::iterator bit = browser_list_.begin();
  for (; bit != browser_list_.end(); ++bit) {
    if ((*bit)->IsSame(browser)) {
      browser_list_.erase(bit);
      break;
    }
  }

  if (browser_list_.empty()) {
    // All browser windows have closed. Quit the application message loop.
    CefQuitMessageLoop();
  }
}

void FCHostHandler::OnLoadError(CefRefPtr<CefBrowser> browser,
                                CefRefPtr<CefFrame> frame,
                                ErrorCode errorCode,
                                const CefString& errorText,
                                const CefString& failedUrl) {
  CEF_REQUIRE_UI_THREAD();

  // Don't display an error for downloaded files.
  if (errorCode == ERR_ABORTED)
    return;

  // Display a load error message.
  std::stringstream ss;
  ss << "<html><body bgcolor=\"white\">"
        "<h2>Failed to load URL "
     << std::string(failedUrl) << " with error " << std::string(errorText)
     << " (" << errorCode << ").</h2></body></html>";

  frame->LoadURL(GetDataURI(ss.str(), "text/html"));
}

void FCHostHandler::OnLoadEnd(CefRefPtr<CefBrowser> browser,
                              CefRefPtr<CefFrame> frame,
                              int httpStatusCode) {
    CEF_REQUIRE_UI_THREAD();

    /* CEF doesn't implement a native '<input type=color>' handler, so we just hack one into the javascript after the page is loaded.  If this ever gets fixed upstream in CEF, we can lose all this code.
     * We'll initialize tinyColorPicker, attach a mutation observer to the entire document, and anytime a new color input is added, we'll steal its events and connect it to TCP.
     * Note that this copy of TCP is slightly modified to avoid event loops since we need to fire onChange events in the render callback for FC itself, so don't blindly try to update it. */
    frame->ExecuteJavaScript(
        "if (!window.FCHostColorMutationObserver) {\
            /*! tinyColorPicker - v1.1.1 2016-08-30 */\
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c,e,k,q=b||p,r=v,s=o.options,t=l,u=q.RND,w=\"\",x=\"\",y={hsl:\"hsv\",rgb:a},z=u.rgb;if(\"alpha\"!==a){for(var A in t)if(!t[A][A]){a!==A&&(x=y[A]||\"rgb\",q[A]=r[x+\"2\"+A](q[x])),u[A]||(u[A]={}),c=q[A];for(w in c)u[A][w]=n(c[w]*t[A][w][1])}z=u.rgb,q.HEX=r.RGB2HEX(z),q.equivalentGrey=s.grey.r*q.rgb.r+s.grey.g*q.rgb.g+s.grey.b*q.rgb.b,q.webSave=e=f(z,51),q.webSmart=k=f(z,17),q.saveColor=z.r===e.r&&z.g===e.g&&z.b===e.b?\"web save\":z.r===k.r&&z.g===k.g&&z.b===k.b?\"web smart\":\"\",q.hueRGB=v.hue2RGB(q.hsv.h),b&&(q.background=d(z,q.rgb,q.alpha))}var B,C,D,E=q.rgb,F=q.alpha,G=\"luminance\",H=q.background;return 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c=a>=b?(a+.05)/(b+.05):(b+.05)/(a+.05),n(100*c)/100}function k(a,b,c){return a>c?c:b>a?b:a}var l={rgb:{r:[0,255],g:[0,255],b:[0,255]},hsv:{h:[0,360],s:[0,100],v:[0,100]},hsl:{h:[0,360],s:[0,100],l:[0,100]},alpha:{alpha:[0,1]},HEX:{HEX:[0,16777215]}},m=a.Math,n=m.round,o={},p={},q={r:.298954,g:.586434,b:.114612},r={r:.2126,g:.7152,b:.0722},s=function(a){this.colors={RND:{}},this.options={color:\"rgba(0,0,0,0)\",grey:q,luminance:r,valueRanges:l},t(this,a||{})},t=function(a,d){var e,f=a.options;u(a);for(var g in d)d[g]!==b&&(f[g]=d[g]);e=f.customBG,f.customBG=\"string\"==typeof e?v.txt2color(e).rgb:e,p=c(a.colors,f.color,b,!0)},u=function(a){o!==a&&(o=a,p=a.colors)};s.prototype.setColor=function(a,d,f){return u(this),a?c(this.colors,a,d,b,f):(f!==b&&(this.colors.alpha=k(f,0,1)),e(d))},s.prototype.setCustomBackground=function(a){return u(this),this.options.customBG=\"string\"==typeof a?v.txt2color(a).rgb:a,c(this.colors,b,\"rgb\")},s.prototype.saveAsBackground=function(){return 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d=b(this),f=d.offset(),h=b(a),k=r.gap;c?(s=g(d),s._colorMode=s.data(\"colorMode\"),p.$trigger=d,(t||i()).css(r.positionCallback.call(p,d)||{left:(t._left=f.left)-((t._left+=t._width-(h.scrollLeft()+h.width()))+k>0?t._left+k:0),top:(t._top=f.top+d.outerHeight())-((t._top+=t._height-(h.scrollTop()+h.height()))+k>0?t._top+k:0)}).show(r.animationSpeed,function(){c!==!0&&(y.toggle(!!r.opacity)._width=y.width(),v._width=v.width(),v._height=v.height(),u._height=u.height(),q.setColor(e(s[0])),n(!0))}).off(\".tcp\").on(D,\".cp-xy-slider,.cp-z-slider,.cp-alpha\",j)):p.$trigger&&b(t).hide(r.animationSpeed,function(){n(!1),p.$trigger=null}).off(\".tcp\")}function i(){return b(\"head\")[r.cssPrepend?\"prepend\":\"append\"]('<style type=\"text/css\" 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a=e(this),d=a.split(\"(\"),f=g(b(this));f.data(\"colorMode\",d[1]?d[0].substr(0,3):\"HEX\").attr(\"readonly\",r.preventFocus),c.doRender&&f.css({\"background-color\":a,color:function(){return q.setColor(a).rgbaMixBGMixCustom.luminance>.22?c.dark:c.light}})})},b.fn.colorPicker.destroy=function(){b(\"*\").off(\".tcp\"),p.toggle(!1),B=b()}});\
            window.FCHostColorMutationObserver = new MutationObserver((mutationList) => { \
                $('input[type=color]').colorPicker({doRender: false, renderCallback: function ($elm, toggled) { const evt = new Event('change', {target:$elm[0], bubbles:false}); $elm[0].dispatchEvent(evt); }});\
            });\
            window.FCHostColorMutationObserver.observe(document.body.parentElement, {childList: true, subtree: true});\
        }", frame->GetURL(), 0);
}

void FCHostHandler::OnBeforeDownload(CefRefPtr<CefBrowser> browser,
									 CefRefPtr<CefDownloadItem> download_item,
									 const CefString& suggested_name,
									 CefRefPtr< CefBeforeDownloadCallback > callback)
{
	CEF_REQUIRE_UI_THREAD();

	callback->Continue(suggested_name, true);
}

bool FCHostHandler::OnPreKeyEvent(CefRefPtr<CefBrowser> browser,
	const CefKeyEvent& event,
	CefEventHandle os_event,
	bool* is_keyboard_shortcut)
{
	CEF_REQUIRE_UI_THREAD();

	// for nonwindows platforms, we need to know the windows equivalent keycode, because CEF will convert to them for us
	const int key_f = 0x46;
	const int key_j = 0x4A;
	const int key_plus = 0xBB;
	const int key_numpad_plus = 0x6B;
	const int key_minus = 0xBD;
	const int key_numpad_minus = 0x6D;

	if (event.type == cef_key_event_type_t::KEYEVENT_RAWKEYDOWN)
	{
		// CTRL+SHIFT+J - bring up the Javascript debugger
		if ((event.modifiers == (cef_event_flags_t::EVENTFLAG_CONTROL_DOWN | cef_event_flags_t::EVENTFLAG_SHIFT_DOWN)) && event.windows_key_code == key_j)
		{
			CefWindowInfo windowInfo;
			CefBrowserSettings settings;
			CefPoint point;
  #if defined (OS_WIN)
			windowInfo.SetAsPopup(browser->GetHost()->GetWindowHandle(), "DevTools");
  #elif defined(OS_LINUX)
			windowInfo.SetAsChild(browser->GetHost()->GetWindowHandle(), CefRect(100, 100, 800, 600));
  #else
			#error "Platform-specific code required"
  #endif
			browser->GetHost()->ShowDevTools(windowInfo, browser->GetHost()->GetClient(), settings, point);

			return true;
		}
		// CTRL+F - bring up Find In Page
		else if (event.modifiers == cef_event_flags_t::EVENTFLAG_CONTROL_DOWN && event.windows_key_code == key_f)
		{
			// probably can do this at some point by ripping off code from the full-fat cefclient, but damn there's a lot of it...
			// return true;
		}
		// CTRL++ - zoom in
		else if (event.modifiers == cef_event_flags_t::EVENTFLAG_CONTROL_DOWN && (event.windows_key_code == key_plus || event.windows_key_code == key_numpad_plus))
		{
			double curZoom = browser->GetHost()->GetZoomLevel();
			browser->GetHost()->SetZoomLevel(curZoom + 1.0);
		}
		// CTRL+- - zoom out
		else if (event.modifiers == cef_event_flags_t::EVENTFLAG_CONTROL_DOWN && (event.windows_key_code == key_minus || event.windows_key_code == key_numpad_minus))
		{
			double curZoom = browser->GetHost()->GetZoomLevel();
			browser->GetHost()->SetZoomLevel(curZoom - 1.0);
		}
	}

	return false;
}


void FCHostHandler::CloseAllBrowsers(bool force_close) {
  if (!CefCurrentlyOn(TID_UI)) {
    // Execute on the UI thread.
    CefPostTask(TID_UI, base::BindOnce(&FCHostHandler::CloseAllBrowsers, this,
                                   force_close));
    return;
  }

  if (browser_list_.empty())
    return;

  BrowserList::const_iterator it = browser_list_.begin();
  for (; it != browser_list_.end(); ++it)
    (*it)->GetHost()->CloseBrowser(force_close);
}