微信公众号js接口，实现图片的上传（拍照+本地相册）

     今天测试了一把在微信公众号里边的调用JSSDK接口，从而实现在微信公众号里边进行图片的上传（可以选择拍照，也可以选择本地的相册），但是在做的过程中发现给的技术接口文档是真坑，一点都不详细，网上的资源也不多，所以做起来感觉十分的费劲。不过经过一个下午的琢磨，中终于实现的该项功能。

      大致流程就是，点击上传的图片，开始调用chooseImage()接口，选择拍照或者相册，选定图片，之后调用uploadImage()接口进行图片的上传，上传完成之后调用downloadImage()将图片数据下载到本地，通过本地的id，调用getLocalImgData()获取图片的数据，该数据是base64数据，可以直接使用img标签显示，也可以将base64数据转换成图片文件。

主要实现代码：

demo.php

GetSignPackage();
?>


上传


    
    

    
appId = $appId;
        $this->appSecret = $appSecret;
    }

    public function getSignPackage() {
        $jsapiTicket = $this->getJsApiTicket();

        // 注意 URL 一定要动态获取，不能 hardcode.
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

        $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 getJsApiTicket() {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = @json_decode(file_get_contents("./jsapi_ticket.json"));
        //$data = @json_decode(file_get_contents("./jsapi_ticket.json"),true);//如果这是加true的话，将按照数组来处理，不加的将会是数组对象
//        echo "jsapi_ticket";
//        echo gettype($data);
        if ($data->expire_time < time()) {

            $accessToken = $this->getAccessToken();
            // 如果是企业号用以下 URL 获取 ticket
            // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $res = json_decode($this->httpGet($url));

            $ticket = $res->ticket;
            if ($ticket) {
                @$data->expire_time = time() + 7000;
                @$data->jsapi_ticket = $ticket;
                $fp = fopen("./jsapi_ticket.json", "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $ticket = $data->jsapi_ticket;
        }

        return $ticket;
    }

    private function getAccessToken() {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = @json_decode(file_get_contents("./access_token.json"));
//        echo "access_token";
//        echo gettype($data);
        if (@$data->expire_time < time()) {
            // 如果是企业号用以下URL获取access_token
            // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this->httpGet($url));
            $access_token = $res->access_token;
            if ($access_token) {
                @$data->expire_time = time() + 7000;
                @$data->access_token = $access_token;
                $fp = fopen("./access_token.json", "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } 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;
    }
}

base64数据转换图片 demodeal.php

'0001','localData' => $localData],JSON_UNESCAPED_UNICODE);
            exit(0);
        }else{
            echo json_encode(['code'=>'0002' ,'localData'=>$localData],JSON_UNESCAPED_UNICODE);
            exit(0);
        }
    }