nodejs实现百度舆情接口应用示例

 const URL = require('url'); const http = require('http'); const https = require('https'); const qs = require('querystring'); let trends = exports; trends.getInstance = function () { return new Trends; } function Trends() { this.expireTime = 1800; this.accessKey = 'xxxxxxxx'; this.secretKey = 'xxxxxxxx'; this.userKey = 'xxxxxxxx'; this.userSecret = 'xxxxxxxx'; this.host = 'trends.baidubce.com'; this.timestamp = _.time(); this.utcTimestamp = _.utcTime(); } Trends.prototype.request = async function (method, uri, params) { method = method.toUpperCase(); let token = this.getToken(); let headers = this.getHeaders(method, uri); params = Object.assign({}, params || {}, { 'user_key': this.userKey, 'token': token, 'timestamp': this.timestamp }); let url = `http://${this.host}${uri}`; return await this.httpRequest(method, url, params, headers); } Trends.prototype.getHeaders = function (method, uri) { let authorization = this.getAuthorization(method, uri); return { 'Content-Type': 'application/x-www-form-urlencoded', 'Host': this.host, 'x-bce-date': this.utcTimestamp, 'Authorization': authorization, }; } Trends.prototype.getAuthorization = function (method, uri) { let authString = `bce-auth-v1/${this.accessKey}/${this.utcTimestamp}/${this.expireTime}`; let signinKey = _.hmac(authString, this.secretKey, 'sha256'); let header = { 'host': this.host, 'x-bce-date': _.urlencode(this.utcTimestamp) }; let headerArr = []; for (let name in header) { let val = header[name]; headerArr.push(`${name}:${val}`); } let headerKeyStr = Object.keys(header).sort().join(';'); let requestStr = `${method}\n${uri}\n\n${headerArr.join('\n')}`; let signautre = _.hmac(requestStr, signinKey, 'sha256'); return `${authString}/${headerKeyStr}/${signautre}`; } Trends.prototype.getToken = function () { return _.hmac(this.userKey + this.timestamp, this.userSecret); } Trends.prototype.httpRequest = async function (method, url, params, headers) { let urlObj = URL.parse(url); let protocol = urlObj.protocol; let options = { hostname: urlObj.hostname, port: urlObj.port, path: urlObj.path, method: method, headers: headers, timeout: 10000, }; let postData = qs.stringify(params || {}); return new Promise((resolve, reject) => { let req = (protocol == 'http:' ? http : https).request(options, (res) => { let chunks = []; res.on('data', (data) => { chunks.push(data); }); res.on('end', () => { let buffer = Buffer.concat(chunks); let encoding = res.headers['content-encoding']; if (encoding == 'gzip') { zlib.unzip(buffer, function (err, decoded) { resolve(decoded.toString()); }); } else if (encoding == 'deflate') { zlib.inflate(buffer, function (err, decoded) { resolve(decoded.toString()); }); } else { resolve(buffer.toString()); } }); }); req.on('error', (e) => { _.error('request error', method, url, params, e); resolve(''); }); req.on("timeout", (e) => { _.error('request timeout', method, url, params, e); resolve(''); }) if (method.toUpperCase() == 'POST') { req.write(postData); } req.end(); }); } 

 module.exports = function () { return new Script; } function Script() {} Script.prototype.run = async function () { let rst = this.getTaskList(); console.log(rst); } Script.prototype.getTaskList = async function () { let params = {}; let method = 'post'; let uri = '/openapi/getTasklist'; let rst = await _.trends.getInstance().request(method, uri, params); return rst; }