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const { Agent } = require('http');
const superagent = require('superagent');
const { DataTypes } = require('general-mq/lib/constants');
const keepAliveAgent = new Agent({ keepAlive: true });
/**
* Options of the HTTP client `Client` that contains OAuth2 information.
*
* @typedef {Object} ClientOptions
* @property {string} authBase `sylvia-iot-auth` base path with scheme. For example
* `http://localhost:1080/auth`.
* @property {string} coremgrBase `sylvia-iot-coremgr` base path with scheme. For example
* `http://localhost:1080/coremgr`.
* @property {string} clientId Client ID.
* @property {string} clientSecret Client secret.
*/
/**
* The HTTP client to request Sylvia-IoT APIs. With this client, you do not need to handle 401
* refresh token flow.
*
* @class Client
*/
class Client {
/**
* Create an instance.
*
* @param {ClientOptions} opts
* @throws {Error} Wrong arguments.
*/
constructor(opts) {
if (!opts || typeof opts !== DataTypes.Object || Array.isArray(opts)) {
throw Error('`opts` is not an object');
} else if (!opts.authBase || typeof opts.authBase !== DataTypes.String) {
throw Error('`opts.authBase` is not a string');
} else if (!opts.coremgrBase || typeof opts.coremgrBase !== DataTypes.String) {
throw Error('`opts.coremgrBase` is not a string');
} else if (!opts.clientId || typeof opts.clientId !== DataTypes.String) {
throw Error('`opts.clientId` is not a string');
} else if (!opts.clientSecret || typeof opts.clientSecret !== DataTypes.String) {
throw Error('`opts.clientSecret` is not a string');
}
this.#authBase = opts.authBase;
this.#coremgrBase = opts.coremgrBase;
this.#clientId = opts.clientId;
this.#clientSecret = opts.clientSecret;
}
/**
* Execute a Sylvia-IoT API request.
*
* @param {string} method
* @param {string} apiPath The relative path (of the coremgr base) the API with query string. For
* example: `/api/v1/user/list?contains=word`, the client will do a request with
`http://coremgr-host/coremgr/api/v1/user/list?contains=word` URL.
* @param {Object} [body]
* @param {function} callback
* @param {?Error} callback.err
* @param {number} callback.status
* @param {Object|Array} callback.body
* @throws {Error} Wrong arguments.
*/
request(method, apiPath, body, callback) {
if (!method || typeof method !== DataTypes.String) {
throw Error('`method` is not a string');
} else if (!apiPath || typeof apiPath !== DataTypes.String) {
throw Error('`apiPath` is not a string');
}
if (typeof body === DataTypes.Function) {
callback = body;
body = undefined;
}
if (body !== undefined && (!body || typeof body !== DataTypes.Object)) {
throw Error('`body` is not an object');
}
if (typeof callback !== DataTypes.Function) {
throw Error('`callback` is not a function');
}
let retry = 1;
let retStatus = 0;
let retBody = null;
const self = this;
(function innerRequest() {
Iif (retry < 0) {
return void callback(null, retStatus, retBody);
}
if (!self.#accessToken) {
return void self.#authToken((err, token) => {
if (err) {
return void callback(err);
}
self.#accessToken = token;
retry--;
innerRequest();
});
}
superagent(method, `${self.#coremgrBase}${apiPath}`)
.agent(keepAliveAgent)
.set('Authorization', `Bearer ${self.#accessToken}`)
.send(body)
.buffer(false)
.end((err, res) => {
if (!res) {
return void callback(err || Error(JSON.stringify({ code: 'err_rsc' })));
}
let body = res.body;
Iif (res.body.length > 0) {
// Try to parse JSON body.
try {
body = JSON.parse(res.body.toString());
} catch (e) {}
}
retStatus = res.statusCode;
retBody = body;
Iif (res.statusCode === 401) {
return void self.#authToken((err, token) => {
if (err) {
return void callback(err);
}
self.#accessToken = token;
retry--;
innerRequest();
});
}
callback(null, retStatus, retBody);
});
})();
}
/**
* To authorize the client and get access token/refresh token.
*
* @param {function} callback
* @param {?Error} callback.err
* @param {string} callback.token The access token.
* @throws {Error} Wrong arguments.
*/
#authToken(callback) {
Iif (typeof callback !== DataTypes.Function) {
throw Error('`callback` is not a function');
}
const url = `${this.#authBase}/oauth2/token`;
const body = { grant_type: 'client_credentials' };
superagent
.agent(keepAliveAgent)
.post(url)
.auth(this.#clientId, this.#clientSecret)
.type('form')
.accept('application/json')
.send(body)
.redirects(0)
.end((err, res) => {
if (!res) {
const body = {
code: 'err_rsc',
message: `${err}`,
};
return void callback(Error(JSON.stringify(body)));
} else if (res.statusCode !== 200) {
return void callback(Error(JSON.stringify(res.body)));
}
callback(null, res.body.access_token);
});
}
/**
* `sylvia-iot-auth` base path.
*
* @type {string}
*/
#authBase;
/**
* `sylvia-iot-coremgr` base path.
*
* @type {string}
*/
#coremgrBase;
/**
* Client ID.
*
* @type {string}
*/
#clientId;
/**
* Client secret.
*
* @type {string}
*/
#clientSecret;
/**
* The access token.
*
* @type {string}
*/
#accessToken;
}
module.exports = {
Client,
};
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