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微信支付APIv3的Nodejs版SDK，让开发变得简单不再繁琐
source link: https://thenorthmemory.github.io/post/an-amazing-nodejs-sdk-of-the-wechatpay-apiv3/
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微信支付APIv3的Nodejs版SDK，让开发变得简单不再繁琐
在向云端推送这个 wechatpay-axios-plugin 业务实现时，发现0.1系列还不够好用，还需要进行更多层级的包裹包装，遂再次做了重大更新，让SDK使用起来更简单、飘逸。
先看官方文档，每一个接口，文档都至少标示了请求URL 请求方式 请求参数 返回参数 这几个要素，URL 可以拆分成 Base 及 URI，按照这种思路，封装SDK其实完全就可以不用动脑，即，对URI资源的 POST 或 GET 请求(条件带上参数)，取得返回参数。
更近一步，我们设想一下，如果把众多接口的URI按照斜线(/ slash)分割，然后组织在一起，是不是就可以构建出一颗树，这颗树的每个节点(实体Entity)都存在有若干个方法(HTTP METHODs)，这是不是就能把接口SDK实现更简单化了?!
- /v3/certificates
- /v3/bill/tradebill
- /v3/ecommerce/fund/withdraw
- /v3/ecommerce/profitsharing/orders
- /v3/marketing/busifavor/users/{openid}/coupons/{coupon_code}/appids/{appid}
树形化即：
v3
├── certificates
├── bill
│ └── tradebill
├── ecommerce
│ ├── fund
│ │ └── withdraw
│ └── profitsharing
│ └── orders
└── marketing
└── busifavor
└── users
└── {openid}
└── coupons
└── {coupon_code}
└── appids
└── {appid}按照这种树形构想，我们来看下需要做的封装实现工作：
- 把实体对象，按照实体的排列顺序，映射出请求的URI；
- 每个对象实体，包含有若干操作方法，其中可选带参数发起RPC请求；
- 随官方放出更多的接口，SDK需要能够弹性扩容；
wechatpay-axios-plugin~0.2.0 版本实现了上述这3个目标，我们用伪代码来校验看一下这个封装实现：
require('util').inspect.defaultOptions.depth = 10;
const { Wechatpay } = require('wechatpay-axios-plugin');
const wxpay = new Wechatpay({mchid: '1', serial: '2', privateKey: '3', certs: {'4': '5'}});
wxpay.v3.certificates;
wxpay.v3.bill.tradebill;
wxpay.v3.ecommerce.fund.withdraw;
wxpay.v3.marketing.busifavor.users['{openid}'].coupons.$coupon_code$.appids['wx233544546545989'];
console.info(wxpay);
//以下是输出内容
{
entities: [],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
v3: {
entities: [ 'v3' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
certificates: {
entities: [ 'v3', 'certificates' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload]
},
bill: {
entities: [ 'v3', 'bill' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
tradebill: {
entities: [ 'v3', 'bill', 'tradebill' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload]
}
},
ecommerce: {
entities: [ 'v3', 'ecommerce' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
fund: {
entities: [ 'v3', 'ecommerce', 'fund' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
withdraw: {
entities: [ 'v3', 'ecommerce', 'fund', 'withdraw' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload]
}
}
},
marketing: {
entities: [ 'v3', 'marketing' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
busifavor: {
entities: [ 'v3', 'marketing', 'busifavor' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
users: {
entities: [ 'v3', 'marketing', 'busifavor', 'users' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
'{openid}': {
entities: [ 'v3', 'marketing', 'busifavor', 'users', '{openid}' ],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
coupons: {
entities: [
'v3',
'marketing',
'busifavor',
'users',
'{openid}',
'coupons'
],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
'$coupon_code$': {
entities: [
'v3',
'marketing',
'busifavor',
'users',
'{openid}',
'coupons',
'{coupon_code}'
],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
appids: {
entities: [
'v3',
'marketing',
'busifavor',
'users',
'{openid}',
'coupons',
'{coupon_code}',
'appids'
],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload],
wx233544546545989: {
entities: [
'v3',
'marketing',
'busifavor',
'users',
'{openid}',
'coupons',
'{coupon_code}',
'appids',
'wx233544546545989'
],
withEntities: [Function: withEntities],
get: [AsyncFunction: get],
post: [AsyncFunction: post],
upload: [AsyncFunction: upload]
}
}
}
}
}
}
}
}
}
}
注： API树实体节点，存储在每个 entities 属性上，方便后续的get, post 抑或 upload 方法调用调用前，反构成最终请求的URI；特别地，对于动态树实体节点来说，每个实体节点均提供了 withEntities 方法，用来在最终请求前，把动态实体节点替换成实际的值。
正常用法示例如下：
const {Wechatpay} = require('wechatpay-axios-plugin');
const wxpay = new Wechatpay({/*初始化参数，README有*/}, {/*可选调整axios的参数*/});
//拿证书
wxpay.v3.certificates.get();
//带参申请交易账单
wxpay.v3.bill.tradebill.get({params: {bill_date}});
//带参发起账户余额提现
wxpay.v3.ecommerce.fund.withdraw.post({sub_mchid, out_request_no, amount, remark, bank_memo});
//查询用户单张券详情
wxpay.v3.marketing.busifavor.users['{openid}'].coupons.$coupon_code$.appids['wx233544546545989'].withEntities({openid, coupon_code}).get();
请求APIv3是不是就“*丧心病狂*”般的简单了？！
详细功能说明及用法示例，npmjs及github的README均有。
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