微信簽約

前段時間，由於業務需要接入微信代扣功能。 做代扣功能之前。用戶需要調用微信客戶端 進行免密代扣的簽約。

大概流程如下：

在生成簽約url后，調不起來微信webview問題整理如下：

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

      

2、微信官方文檔中之處需要對notify_url 進行url編碼，並且IOS編碼兩次。   當url編碼后發現IOS端還是調不起來微信 webview。

•      后來經過，不斷嘗試，發現當我們contract_display_account為中文時，同樣需要兩次url encode；
•      同時生產簽約參數的notify_url ，contract_display_account不能進行url編碼

3、簽約部分的代碼邏輯如下：

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();
    }