前段时间忙于CanTK 2.0的开发，所以博客一直没有更新。CanTK 2.0主要增强了游戏和富媒体的开发，现在编码和测试基本完成了，等文档完成了再正式发布，里面有不少激动人心的功能，等发布时再一一细说吧。
最近同事用CanTK开发了一个基于微信的贺卡制作APP，我虽然没有参与开发，但是提供CanTK和GameBuilder的技术支持，觉得有些东西比较有意思，写几篇博客和大家分享吧。这个贺卡APP完全开源，有需要的朋友可以随意修改和发布。
CanTK(Canvas ToolKit)是一个开源的游戏引擎和APP框架，是开发HTML5游戏和APP的利器，如果你喜欢它，请在github上给它加星，您的支持是我们努力的动力：https://github.com/drawapp8/cantk
0.先Show一下最终成果:
在线运行：http://gamebuilder.duapp.com/apprun.php?appid=osgames1-821423377846894
在线编辑：http://gamebuilder.duapp.com/gamebuilder.php?appid=osgames1-821423377846894
微信扫码：
1.生成微信JS SDK配置
生成微信JS SDK配置的资料，网上已经不少，我们拿来时做些几点改进：
- 缓存放到临时目录，而不是当前目录。
- 过期时间改成3600秒，而不是官方的两个小时。
- 把它做成一个服务，APP通过AJAX来生成当前URL需要的配置，方便CanTK的调用。
代码如下：
<?php
class JSSDK {
private $appId;
private $appSecret;
public function __construct($appId, $appSecret) {
$this->appId = $appId;
$this->appSecret = $appSecret;
}
public function getSignPackage($url) {
$jsapiTicket = $this->getJsApiTicket();
if(!$url) {
$url = "http://$_SERVER[HTTP_HOST]" . '/weixin/demo/index.html';
}
$timestamp = time();
$nonceStr = $this->createNonceStr();
// 这里参数的顺序要按照 key 值 ASCII 码升序排序
$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr×tamp=$timestamp&url=$url";
$signature = sha1($string);
$signPackage = array(
"appId" => $this->appId,
"nonceStr" => $nonceStr,
"timestamp" => $timestamp,
"url" => $url,
"signature" => $signature,
"rawString" => $string
);
return $signPackage;
}
private function createNonceStr($length = 16) {
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$str = "";
for ($i = 0; $i < $length; $i++) {
$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
return $str;
} private function getFileName($name) {
$fileName = sys_get_temp_dir() . "/weixin-" . $name;
return $fileName;
} private function saveData($name, $content) {
$fileName = $this->getFileName($name); $fp = fopen($fileName, "wb+");
if($fp) {
fwrite($fp, $content);
fclose($fp);
} return;
} private function loadData($name, $defaultContent) {
$fileName = $this->getFileName($name);
$content = file_get_contents($fileName); if($content) {
return $content;
}
else {
return $defaultContent;
} return;
} private function getJsApiTicket() {
$data = json_decode($this->loadData("jsapi_ticket.json", '{"jsapi_ticket":"", "expire_time":0}'));
if ($data->expire_time < time()) {
$accessToken = $this->getAccessToken();
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
$res = json_decode($this->httpGet($url));
$ticket = $res->ticket;
if ($ticket) {
$data->expire_time = time() + 3600;
$data->jsapi_ticket = $ticket;
$this->saveData("jsapi_ticket.json", json_encode($data));
}
} else {
$ticket = $data->jsapi_ticket;
}
return $ticket;
}
private function getAccessToken() {
$data = json_decode($this->loadData("access_token.json", '{"access_token":"", "expire_time": 0}'));
if ($data->expire_time < time()) {
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
$res = json_decode($this->httpGet($url));
if(!isset($res->access_token)) {
print_r($res);
exit;
} $access_token = $res->access_token;
if ($access_token) {
$data->expire_time = time() + 3000;
$data->access_token = $access_token;
$this->saveData("access_token.json", json_encode($data));
}
} else {
$access_token = $data->access_token;
}
return $access_token;
}
private function httpGet($url) {
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 500);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_URL, $url);
$res = curl_exec($curl);
curl_close($curl);
return $res;
}
} session_start();
if(!isset($_REQUEST['url'])) {
echo "invalid arguments";
exit;
} $appID = "xxxxx";
$appSecret = "xxxxx"; $url = $_REQUEST['url'];
$url = base64_decode($url); $jssdk = new JSSDK($appID, $appSecret);
$signPackage = $jssdk->getSignPackage($url);
$signPackage['jsApiList'] = [
'checkJsApi',
'chooseImage',
'previewImage',
'uploadImage',
'downloadImage',
'getNetworkType'
]; echo json_encode($signPackage);
?>