SubtitleTranslate - DeepL.as

/*
	real time subtitle translate for PotPlayer using DeepL API
*/

// void OnInitialize()
// void OnFinalize()
// string GetTitle() 														-> get title for UI
// string GetVersion														-> get version for manage
// string GetDesc()															-> get detail information
// string GetLoginTitle()													-> get title for login dialog
// string GetLoginDesc()													-> get desc for login dialog
// string GetUserText()														-> get user text for login dialog
// string GetPasswordText()													-> get password text for login dialog
// string ServerLogin(string User, string Pass)								-> login
// string ServerLogout()													-> logout
//------------------------------------------------------------------------------------------------
// array<string> GetSrcLangs() 												-> get source language
// array<string> GetDstLangs() 												-> get target language
// string Translate(string Text, string &in SrcLang, string &in DstLang) 	-> do translate !!

string JsonParseNew(string json)
{
	JsonReader Reader;
	JsonValue Root;
	string ret = "";	
	
	if (Reader.parse(json, Root))
	{
        JsonValue translations = Root["translations"];
        
        if (translations.isArray())
        {
            for (int j = 0, len = translations.size(); j < len; j++)
            {		
                JsonValue child1 = translations[j];
                
                if (child1.isObject())
                {
                    JsonValue translatedText = child1["text"];
            
                    if (!ret.empty()) ret = ret + "\n";
                    if (translatedText.isString()) ret = ret + translatedText.asString();
                }
            }
        }
	} 
	return ret;
}

array<string> LangTable = 
{
	"en-US",
    "en-GB",
    "zh"
};

string UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36";

string GetTitle()
{
	return "{$CP950=DeepL 翻譯$}{$CP0=DeepL translate$}";
}

string GetVersion()
{
	return "1";
}

string GetDesc()
{
	return "https://www.deepl.com/";
}

string GetLoginTitle()
{
	return "Input deepl API key";
}

string GetLoginDesc()
{
	return "Input deepl API key";
}

string GetUserText()
{
	return "API key:";
}

string GetPasswordText()
{
	return "";
}

string api_key = "";

string ServerLogin(string User, string Pass)
{
	api_key = User;
	if (api_key.empty()) return "fail";
	return "200 ok";
}

void ServerLogout()
{
	api_key = "";
}

array<string> GetSrcLangs()
{
	array<string> ret = LangTable;
	
	ret.insertAt(0, ""); // empty is auto
	return ret;
}

array<string> GetDstLangs()
{
	array<string> ret = LangTable;
	
	return ret;
}

string Translate(string Text, string &in SrcLang, string &in DstLang)
{
//HostOpenConsole();	// for debug
//HostPrintUTF8(Text);
//HostPrintUTF8(DstLang);
	string ret = "ERR";
	
//	if (SrcLang.length() <= 0) SrcLang = "auto";
//	SrcLang.MakeLower();
	
	string enc = HostUrlEncode(Text);
	
//	by new API	
	if (api_key.length() > 0)
	{
		string url = "https://api-free.deepl.com/v2/translate?text=" + enc + "&target_lang=" + DstLang;
	//	if (!SrcLang.empty() && SrcLang != "auto") url = url + "&source=" + SrcLang;
		url = url + "&auth_key=" + api_key;
		//HostPrintUTF8(url);
		string text = HostUrlGetString(url, UserAgent);
		//HostPrintUTF8(text);
		string ret = JsonParseNew(text);		
		if (ret.length() > 0)
		{
			SrcLang = "UTF8";
			DstLang = "UTF8";
			return ret;
		}	    
	}
	
	return ret;
}