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index.js
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index.js
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/**
* weixin
* @doc http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
* @author ydr.me
* @create 2015-12-08 11:08
*/
'use strict';
var plan = require('blear.utils.plan');
var object = require('blear.utils.object');
var random = require('blear.utils.random');
var number = require('blear.utils.number');
var fun = require('blear.utils.function');
var encryption = require('blear.node.encryption');
var request = require('blear.node.request');
var reHash = /#.*$/;
var WEIXIN_TOKEN_URL = 'https://api.weixin.qq.com/cgi-bin/token';
var WEIXIN_TICKET_URL = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket';
var WEIXIN_ACCESS_TOKEN_URL = 'https://api.weixin.qq.com/sns/oauth2/access_token';
var WEIXIN_USER_INFO = 'https://api.weixin.qq.com/sns/userinfo';
var configs = {
debug: false,
appId: '',
secret: '',
// 指定 accessToken 请求地址
accessTokenURL: '',
// 指定 令牌
jsApiTicket: ''
};
/**
* 配置
* @param cf
*/
exports.config = function (cf) {
object.assign(configs, cf);
};
/**
* URL 微信 JSSDK 签名
* @param url
* @param callback
*/
exports.JSSDKSignature = function (url, callback) {
getJSSDKApiTicket(function (err, info) {
if (err) {
return callback(err);
}
callback(null, JSSDKSignature(info, url));
});
};
/**
* 根据 code 获取 authorization accessToken
* @param code
* @param callback
*/
exports.getAuthorizationAccessToken = function (code, callback) {
requestWeixin({
url: WEIXIN_ACCESS_TOKEN_URL,
query: {
appid: configs.appId,
secret: configs.secret,
code: code,
grant_type: 'authorization_code'
},
debug: configs.debug
}, callback);
};
/**
* 获取用户基本信息
* @param openId
* @param accessToken
* @param callback
*/
exports.getUserInfo = function (openId, accessToken, callback) {
requestWeixin({
url: WEIXIN_USER_INFO,
query: {
access_token: accessToken,
openid: openId,
lang: 'zh_CN'
},
debug: configs.debug
}, callback);
};
/**
* 请求微信
* @param options
* @param callback
*/
exports.request = requestWeixin;
/**
* 解析响应内容
* @type {parseResponseBody}
*/
exports.parseResponseBody = parseResponseBody;
// ===============================================
// 请求微信
function requestWeixin(options, callback) {
request(options, parseResponseCallback(callback));
}
// 获取微信 JSSDK jsapi_ticket
function getJSSDKApiTicket(callback) {
if (configs.jsApiTicket) {
return callback(null, {
ticket: configs.jsApiTicket,
expiresIn: -1
});
}
plan
.task(getJSSDKToken)
.task(function (next, ret) {
requestWeixin({
url: WEIXIN_TICKET_URL,
query: {
access_token: ret.accessToken,
type: 'jsapi'
},
debug: configs.debug
}, next);
})
.serial(callback);
}
/**
* 解析内容为 JSON 对象
* @param body
* @param callback
* @returns {*}
*/
function parseResponseBody(body, callback) {
var ret = {};
try {
ret = JSON.parse(body);
ret.errcode = ret.errcode || 0;
} catch (err) {
ret.errcode = -1;
ret.errmsg = '数据解析失败';
}
if (ret.errcode !== 0) {
return callback(new TypeError(ret.errmsg || '未知错误'));
}
if (ret.expires_in) {
ret.expires_in = ret.expires_in * 1000;
ret.expiresIn = ret.expires_in;
}
if (ret.access_token) {
ret.accessToken = ret.access_token;
}
if (ret.refresh_token) {
ret.refreshToken = ret.refresh_token;
}
if (ret.openid) {
ret.openId = ret.openid;
}
if (ret.unionid) {
ret.unionId = ret.unionid;
}
if (ret.headimgurl) {
ret.avatar = ret.headimgurl;
}
callback(null, ret);
}
/**
* 解析微信返回内容
* @param callback
*/
function parseResponseCallback(callback) {
callback = fun.noop(callback);
return function (err, body) {
if (err) {
return callback(err);
}
parseResponseBody(body, callback);
};
}
// 获取微信 JSSDK token
function getJSSDKToken(callback) {
if (configs.accessTokenURL) {
return requestWeixin({
url: configs.accessTokenURL,
query: {
appid: configs.appId,
secret: configs.secret,
debug: configs.debug
}
}, callback);
}
requestWeixin({
url: WEIXIN_TOKEN_URL,
query: {
grant_type: 'client_credential',
appid: configs.appId,
secret: configs.secret
},
debug: configs.debug
}, callback);
}
/**
* 签名算法
* @param info {String} 用于签名的 jsapi_ticket
* @param url {String} 用于签名的 url ,注意必须动态获取,不能 hardcode
* @returns {Object}
*/
function JSSDKSignature(info, url) {
var ret = {
jsapi_ticket: info.ticket,
nonceStr: random.string(),
timestamp: number.parseInt(Date.now() / 1000),
url: url.replace(reHash, '')
};
var keys = Object.keys(ret);
keys = keys.sort();
var list = [];
keys.forEach(function (key) {
list.push(key.toLowerCase() + '=' + ret[key]);
});
var str = list.join('&');
var signature = encryption.sha1(str);
return object.assign(ret, configs, {
jsApiTicket: info.ticket,
signature: signature,
state: random.string(),
expiresIn: info.expiresIn
});
}