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Client and server OAuth support

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/*
 * Copyright (c) 2014 ICM Uniwersytet Warszawski All rights reserved.
 * See LICENCE.txt file for licensing information.
 */
package pl.edu.icm.unity.oauth.as.webauthz;

import io.imunity.vaadin.endpoint.common.EopException;
import jakarta.servlet.http.HttpServletResponse;
import org.apache.logging.log4j.Logger;
import pl.edu.icm.unity.base.utils.Log;
import pl.edu.icm.unity.engine.api.utils.FreemarkerAppHandler;

import java.io.IOException;
import java.io.PrintWriter;

/**
 * Allows to show a plain error page, if error can not be returned to the requester. 
 * 
 * @author K. Benedyczak
 */
public class ErrorHandler
{
	private Logger log = Log.getLogger(Log.U_SERVER_OAUTH, ErrorHandler.class);
	private FreemarkerAppHandler freemarker;
	
	public ErrorHandler(FreemarkerAppHandler freemarker)
	{
		this.freemarker = freemarker;
	}

	public void showErrorPage(String error, String errorReason, HttpServletResponse response) 
			throws IOException, EopException
	{
		log.info("OAuth error is going to be shown to the user redirected to Unity by the " +
				"OAuth client: " + error + " " + (errorReason == null ? "" : errorReason));
		response.setContentType("text/html; charset=utf-8");
		PrintWriter w = response.getWriter();
		freemarker.printAppErrorPage(w, "OAuth", "Authorization Server got an invalid request.", error, errorReason);
		throw new EopException();
	}
}