UA / URLでの判定でリダイレクト

alternateLink.js

/*
 * alternate-link.js
 * v0.1.0-alpha
 * 2014 MIT
 */
;(function() {
"use strict";

var alternateLink = this.alternateLink || {};

// Constant
var SP_DIR = 'sp';
var SP_UA = 'iphone|android';
var COOKIE_KEY_NAME = '_sp_pc_';
var EXPIRES = (1 / 24) * 8; // day
var AUTO_INSERT_BUTTONS = true;
var BUTTON_INSERT_TARGET_FOR_PC = 'body';
var BUTTON_FOR_PC = '<a href="#" class="sp_header" data-alternate-link="sp">スマートフォン版はこちら</a>';
var BUTTON_INSERT_TARGET_FOR_SP = '#footer';
var BUTTON_FOR_SP = '<div class="pc_button"><a href="#" data-alternate-link="pc">PC版はこちら</a></div>';

// Variable
var location;
var host;
var pathname;
var query;
var hash;
var path;
var pcPath;
var isSpFromUrl;
var isSpFromUa;


alternateLink.getInfo = function() {
	location = window.location;
	host = location.origin;
	pathname = '/' + location.pathname.replace(/^\//, '');
	query = location.search;
	hash = location.hash;
	path = pathname + query + hash;
	pcPath = path.replace(new RegExp('^/' + SP_DIR), '');
	isSpFromUrl = new RegExp('^/' + SP_DIR + '[\/\s]?').test(pathname);
	isSpFromUa = new RegExp(SP_UA, 'ig').test(navigator.userAgent);
	// debugger;
};

alternateLink.isSpFromUrl = function() {
	alternateLink.getInfo();
	return isSpFromUrl;
};

alternateLink.isSpFromUa = function() {
	alternateLink.getInfo();
	return isSpFromUa;
};

alternateLink.redirect = function() {
	alternateLink.getInfo();
	if (isSpFromUa && !isSpFromUrl) {
		location.href = host + '/' + SP_DIR + pcPath;
		return;
	}
	if (!isSpFromUa && isSpFromUrl) {
		location.href = host + pcPath;
		return;
	}
};

alternateLink.forceLinkToPC = function() {
	$.cookie(COOKIE_KEY_NAME, '1', {
		path: '/',
		expires: EXPIRES
	});
	location.href = host + pcPath;
	return;
}

alternateLink.forceLinkToSP = function() {
	$.removeCookie(COOKIE_KEY_NAME, {
		path: '/'
	});
	location.href = host + '/' + SP_DIR + pcPath;
	return;
}

alternateLink.autoRedirect = function() {
	var cookie = !!$.cookie(COOKIE_KEY_NAME);
	if (cookie) {
		alternateLink.getInfo();
		if (isSpFromUa && isSpFromUrl) {
			location.href = host + pcPath;
			return;
		}
	} else {
		alternateLink.redirect();
	}
}

alternateLink.autoRedirect();

$(function() {
	$('[data-alternate-link]').live('click', function() {
		var $this = $(this);
		var al = $this.data('alternate-link');
		switch (al) {
			case 'sp':
				alternateLink.forceLinkToSP();
				break;
			case 'pc':
				alternateLink.forceLinkToPC();
				break;
		}
		return false;
	});

	// insert buttons
	if (AUTO_INSERT_BUTTONS) {
		alternateLink.getInfo();
		if (isSpFromUa && !isSpFromUrl) {
			$(BUTTON_FOR_PC).prependTo(BUTTON_INSERT_TARGET_FOR_PC);
		}
		if (isSpFromUrl) {
			$(BUTTON_FOR_SP).prependTo(BUTTON_INSERT_TARGET_FOR_SP);
		}
	}
});

this.alternateLink = alternateLink;

}).call(this);