微信签约

前段时间，由于业务需要接入微信代扣功能。 做代扣功能之前。用户需要调用微信客户端 进行免密代扣的签约。

大概流程如下：

在生成签约url后，调不起来微信webview问题整理如下：

1、微信代扣文档：https://pay.weixin.qq.com/wiki/doc/api/pap_jt_v2.php?chapter=19_1&index=2

      

2、微信官方文档中之处需要对notify_url 进行url编码，并且IOS编码两次。   当url编码后发现IOS端还是调不起来微信 webview。

•      后来经过，不断尝试，发现当我们contract_display_account为中文时，同样需要两次url encode；
•      同时生产签约参数的notify_url ，contract_display_account不能进行url编码

3、签约部分的代码逻辑如下：

private String generateSignInfo(WithholdContractRecordDO withholdContractRecordDO,  PayChnlInfoDO payChnlInfoDO) throws Exception {
        Map<String, String> signInfo = new HashMap<>();
        signInfo.put("appid", payChnlInfoDO.getChnlAppId());
        signInfo.put("contract_code", withholdContractRecordDO.getContractNo());
        signInfo.put("contract_display_account",  withholdContractRecordDO.getContractUserName());
        signInfo.put("mch_id", payChnlInfoDO.getChnlMchtCd());
        signInfo.put("notify_url", wechatProperty.getSignNotifyUrl());
        signInfo.put("plan_id", payChnlInfoDO.getPlanId());
        signInfo.put("request_serial", DateUtils.format(new Date(), "yyMMddHHmmss") + withholdContractRecordDO.getId());
        signInfo.put("timestamp",String.valueOf(System.currentTimeMillis()).substring(0,10));
        signInfo.put("version", "1.0");
        if (PayServiceConstant.ReturnType.BACK.getCode().equals(withholdContractRecordDO.getReturnApp())) {
            signInfo.put("return_app", "3");
        }
        if (PayServiceConstant.ReturnType.BACK.getCode().equals(withholdContractRecordDO.getReturnWeb())) {
            signInfo.put("return_web", "1");
        }

        String sign = WXPayUtil.generateSignature(signInfo, payChnlInfoDO.getChnlMchtKey(), WXPayConstants.SignType.MD5);
        StringBuffer result = new StringBuffer("https://api.mch.weixin.qq.com/papay/entrustweb?")
                .append("appid=" + signInfo.get("appid"))
                .append("&contract_code=" + signInfo.get("contract_code"))
                .append("&mch_id=" + signInfo.get("mch_id"))
                .append("&plan_id=" + signInfo.get("plan_id"))
                .append("&request_serial=" + signInfo.get("request_serial"))
                .append("&timestamp=" + signInfo.get("timestamp"))
                .append("&version=" + signInfo.get("version"))
                .append("&sign=" + sign);

        URLEncoder urlEncoder = new URLEncoder();
        String notifyUrl = urlEncoder.encode(signInfo.get("notify_url"), Charset.forName("UTF-8"));
        String contractDisplayAccount = urlEncoder.encode(signInfo.get("contract_display_account"), Charset.forName("UTF-8"));
        if ("IOS".equals(withholdContractRecordDO.getMobileType())) {
            notifyUrl = urlEncoder.encode(notifyUrl, Charset.forName("UTF-8"));
            contractDisplayAccount = urlEncoder.encode(contractDisplayAccount, Charset.forName("UTF-8"));
        }

        result.append("&notify_url=" + notifyUrl);
        result.append("&contract_display_account=" + contractDisplayAccount);
        if (StringUtils.isNotBlank(signInfo.get("return_app"))) {
            result.append("&return_app=" + signInfo.get("return_app"));
        }

        if (StringUtils.isNotBlank(signInfo.get("return_web"))) {
            result.append("&return_web=" + signInfo.get("return_web"));
        }
        return result.toString();
    }