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OfficeFloor plug-in for Web
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/*
 * OfficeFloor - http://www.officefloor.net
 * Copyright (C) 2005-2018 Daniel Sagenschneider
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package net.officefloor.web.route;

import java.util.Map;

import net.officefloor.frame.api.build.Indexed;
import net.officefloor.frame.api.function.ManagedFunctionContext;
import net.officefloor.server.http.HttpHeaderName;
import net.officefloor.server.http.HttpHeaderValue;
import net.officefloor.server.http.HttpMethod;
import net.officefloor.server.http.HttpMethod.HttpMethodEnum;
import net.officefloor.server.http.HttpRequest;
import net.officefloor.server.http.HttpResponse;
import net.officefloor.server.http.HttpStatus;
import net.officefloor.server.http.ServerHttpConnection;
import net.officefloor.web.build.HttpValueLocation;
import net.officefloor.web.state.HttpArgument;

/**
 * Leaf {@link WebRouteNode} that services the {@link HttpRequest}.
 * 
 * @author Daniel Sagenschneider
 */
public class LeafWebRouteNode implements WebRouteNode {

	/**
	 * Allow {@link HttpHeaderName}.
	 */
	private static final HttpHeaderName ALLOW = new HttpHeaderName("allow");

	/**
	 * {@link LeafWebRouteHandling} instances by their {@link HttpMethod}.
	 */
	private final Map handlers;

	/**
	 * Allow {@link HttpHeaderValue}.
	 */
	private final HttpHeaderValue allowedMethods;

	/**
	 * Instantiate.
	 * 
	 * @param allowedMethods
	 *            Allowed {@link HttpMethod} names.
	 * @param handlers
	 *            {@link LeafWebRouteHandling} instances by their
	 *            {@link HttpMethod}.
	 */
	public LeafWebRouteNode(String[] allowedMethods, Map handlers) {
		this.handlers = handlers;

		// Create the allow value
		StringBuilder value = new StringBuilder();
		boolean isFirst = true;
		for (String allowedMethod : allowedMethods) {
			if (!isFirst) {
				value.append(", ");
			}
			isFirst = false;
			value.append(allowedMethod);
		}
		this.allowedMethods = new HttpHeaderValue(value.toString());
	}

	/*
	 * ================= WebRouteNode =================
	 */

	@Override
	public boolean handle(HttpMethod method, String path, int index, HttpArgument headPathArgument,
			ServerHttpConnection connection, ManagedFunctionContext context) {

		// Determine if end of path
		boolean isFurtherChecks;
		boolean isEnd = false;
		do {
			isFurtherChecks = false;
			if (path.length() == index) {
				// No further characters, so end of path
				isEnd = true;

			} else {
				// Determine if end of path
				char character = path.charAt(index);
				switch (character) {
				case '?':
				case '#':
					// Path end, as starting query string or fragment
					isEnd = true;
					break;

				case '/':
					// Determine if optional ending slash
					index++; // move past '/'
					isFurtherChecks = true;
					break;
				}
			}
		} while (isFurtherChecks);

		// Determine if end
		if (!isEnd) {
			return false; // not end, so not handled
		}

		// Obtain the handler
		WebRouteHandler handler = null;
		LeafWebRouteHandling handling = this.handlers.get(method.getEnum());
		if (handling != null) {
			handler = handling.handlerFactory.apply(method);
		}

		// Undertake handling
		if (handler != null) {

			// Obtain the named path arguments
			HttpArgument namedArguments = null;
			String[] parameterNames = handling.parameterNamesFactory.apply(method);
			if (parameterNames.length > 0) {

				// Load the last parameter
				String name = parameterNames[parameterNames.length - 1];
				namedArguments = new HttpArgument(name, headPathArgument.value, HttpValueLocation.PATH);
				headPathArgument = headPathArgument.next;

				// Load the remaining parameters
				for (int i = parameterNames.length - 2; i >= 0; i--) {
					name = parameterNames[i];

					// Add in the parameter
					HttpArgument nextArgument = new HttpArgument(name, headPathArgument.value, HttpValueLocation.PATH);
					nextArgument.next = namedArguments;
					namedArguments = nextArgument;

					// Move to next argument
					headPathArgument = headPathArgument.next;
				}
			}

			// Handle request
			handler.handle(namedArguments, connection, context);

		} else {
			// Method not allowed
			HttpResponse response = connection.getResponse();
			response.setStatus(HttpStatus.METHOD_NOT_ALLOWED);
			response.getHeaders().addHeader(ALLOW, this.allowedMethods);
		}

		// Handled
		return true;
	}

}