nodejs实现百度舆情接口应用示例

本文实例讲述了nodejs实现百度舆情接口。分享给大家供大家参考，具体如下：

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;
}

希望本文所述对大家node.js程序设计有所帮助。