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// Project website: https://github.com/cztomczak/cefpython

#include "javascript_callback.h"

#include <map>

#include <sstream>

#include "DebugLog.h"

#include "v8utils.h"

#include "cefpython_app.h"

template<typename T>

inline std::string AnyToString(const T& value)

{

std::ostringstream oss;

oss << value;

return oss.str();

}

typedef std::map<int,

std::pair<CefRefPtr<CefFrame>, CefRefPtr<CefV8Value> > >

JavascriptCallbackMap;

JavascriptCallbackMap g_jsCallbackMap;

int g_jsCallbackMaxId = 0;

CefString PutJavascriptCallback(

CefRefPtr<CefFrame> frame, CefRefPtr<CefV8Value> jsCallback) {

// Returns a "####cefpython####" string followed by json encoded data.

// {"what":"javascript-callback","callbackId":123,

// "frameId":123,"functionName":"xx"}

int callbackId = ++g_jsCallbackMaxId;

int64 frameId = frame->GetIdentifier();

CefString functionName = jsCallback->GetFunctionName();

std::string strCallbackId = "####cefpython####";

strCallbackId.append("{");

// JSON format allows only for double quotes.

strCallbackId.append("\"what\":\"javascript-callback\"");

strCallbackId.append(",\"callbackId\":").append(AnyToString(callbackId));

strCallbackId.append(",\"frameId\":").append(AnyToString(frameId));

strCallbackId.append(",\"functionName\":\"").append(functionName) \

.append("\"");

strCallbackId.append("}");

g_jsCallbackMap.insert(std::make_pair(

callbackId,

std::make_pair(frame, jsCallback)));

return strCallbackId;

}

bool ExecuteJavascriptCallback(int callbackId, CefRefPtr<CefListValue> args) {

if (g_jsCallbackMap.empty()) {

DebugLog("Renderer: ExecuteJavascriptCallback() FAILED: " \

"callback map is empty");

return false;

}

JavascriptCallbackMap::const_iterator it = g_jsCallbackMap.find(

callbackId);

if (it == g_jsCallbackMap.end()) {

std::string logMessage = "Renderer: ExecuteJavascriptCallback() "

"FAILED: callback not found, id=";

logMessage.append(AnyToString(callbackId));

DebugLog(logMessage.c_str());

return false;

}

CefRefPtr<CefFrame> frame = it->second.first;

CefRefPtr<CefV8Value> callback = it->second.second;

CefRefPtr<CefV8Context> context = frame->GetV8Context();

context->Enter();

CefV8ValueList v8Arguments = CefListValueToCefV8ValueList(args);

CefRefPtr<CefV8Value> v8ReturnValue = callback->ExecuteFunction(

NULL, v8Arguments);

if (v8ReturnValue.get()) {

context->Exit();

return true;

} else {

context->Exit();

DebugLog("Renderer: ExecuteJavascriptCallback() FAILED: " \

"callback->ExecuteFunction() FAILED");

return false;

}

void RemoveJavascriptCallbacksForFrame(CefRefPtr<CefFrame> frame) {

if (g_jsCallbackMap.empty()) {

return;

}

JavascriptCallbackMap::iterator it = g_jsCallbackMap.begin();

int64 frameId = frame->GetIdentifier();

while (it != g_jsCallbackMap.end()) {

if (it->second.first->GetIdentifier() == frameId) {

// Pass current iterator and increment it after passing

// to the function, but before erase() is called, this

// is important for it to work in a loop. You can't do this:

// | if (..) erase(it);

// | ++it;

// This would cause an infinite loop.

g_jsCallbackMap.erase(it++);

DebugLog("Renderer: RemoveJavascriptCallbacksForFrame(): " \

"removed js callback from the map");

} else {

++it;

}

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