smartproxy/ts/smartproxy.classes.networkproxy.ts

import * as plugins from './smartproxy.plugins.js';
import { ProxyRouter } from './smartproxy.classes.router.js';

export interface INetworkProxyOptions {
  port: number;
}

export class NetworkProxy {
  // INSTANCE
  public options: INetworkProxyOptions;
  public proxyConfigs: plugins.tsclass.network.IReverseProxyConfig[] = [];
  public httpsServer: plugins.https.Server;
  public router = new ProxyRouter();
  public socketMap = new plugins.lik.ObjectMap<plugins.net.Socket>();
  public defaultHeaders: { [key: string]: string } = {};

  public alreadyAddedReverseConfigs: {
    [hostName: string]: plugins.tsclass.network.IReverseProxyConfig;
  } = {};

  constructor(optionsArg: INetworkProxyOptions) {
    this.options = optionsArg;
  }

  /**
   * starts the proxyInstance
   */
  public async start() {
    this.httpsServer = plugins.https.createServer(
      // ================
      // Spotted this keypair in the code?
      // Don't get exited:
      // It is an invalid default keypair.
      // For proper requests custom domain level keypairs are used that are provided in the reverse config
      // ================
      {
        key: `-----BEGIN PRIVATE KEY-----
MIIJRQIBADANBgkqhkiG9w0BAQEFAASCCS8wggkrAgEAAoICAQDi2F/0kQr96mhe
3yEWvy2mRHOZoSSBtIqg6Bre4ZcMu901/cHNIjFnynNGFl9Se61yZbW2F3PfCt7+
kQlHug1Cx+LFssvz+hLlB5cqJQZfRKx92DhbROygtxG9r7UBmx/fwx+JQ+HOHX9R
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RbYse/quzAednVnY/+BuGVn8SEb2EVVFnBEsOxxYpy5ZzGR48O3YnWkM2oPpJhrp
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NAnoAPua683MD2ZZd4eovEww/imSZvui3NlisSSh1SomABDFxiEaHpewI98n8P1E
3vfg4lyCV5VcUjwrPjnkfEJbX1c1/PXqTtPqSqFn/pI4FuTES6qDugS2EA/XT1ln
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p8Y3j9QVjZ3m7K3NuGjFCG75kE5x7PHCkl+Ea4zV4EFNWLS5/cD1Vz8pEiRHhlKn
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AR54wNuSBDLCIylTIn016oD37DpjeoVvYBADTu/HMQKCAQEA1rFuajrVrWnMpo98
pNC7xOLQM9DwwToOMtwH2np0ZiiAj+ENXgx+R1+95Gsiu79k5Cn6oZsqNhPkP+Bb
fba69M1EDnInmGloLyYDIbbFlsMwWhn7cn+lJYpfVJ9TK+0lMWoD1yAkUa4+DVDz
z2naf466wKWfnRvnEAVJcu+hqizxrqySzlH4GDNUhn7P/UJkGFkx+yUSGFUZdLsM
orfBWUCPXSzPttmXBJbO+Nr+rP+86KvgdI/AT0vYFNdINomEjxsfpaxjOAaW0wfz
8jCyWKoZ0gJNEeK32GO5UA7dcgBHD3vQWa3lijo8COsznboaJe7M6PQpa/2S2H3+
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h+7fBVO49PLL0NWy+8GT8y7a04calFfLvZEA2UMaunBis3dE1KMFfJL/0JO+sKnF
2TkK01XDDJURK5Lhuvc7WrK2rSJ/fK+0GA==
-----END PRIVATE KEY-----
    `,
        cert: `-----BEGIN CERTIFICATE-----
MIIEljCCAn4CCQDY+ZbC9FASVjANBgkqhkiG9w0BAQsFADANMQswCQYDVQQGEwJE
RTAeFw0xOTA5MjAxNjAxNDRaFw0yMDA5MTkxNjAxNDRaMA0xCzAJBgNVBAYTAkRF
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA4thf9JEK/epoXt8hFr8t
pkRzmaEkgbSKoOga3uGXDLvdNf3BzSIxZ8pzRhZfUnutcmW1thdz3wre/pEJR7oN
QsfixbLL8/oS5QeXKiUGX0Ssfdg4W0TsoLcRva+1AZsf38MfiUPhzh1/UW/rMywW
asazQwRZdkkXb4nKJ2IFZx22qnAD4/5Sug+sfeKoFBF/rzI2yK7rognt7kW2LHv6
rswHnZ1Z2P/gbhlZ/EhG9hFVRZwRLDscWKcuWcxkePDt2J1pDNqD6SYa6ZjGC3AE
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BR+rz98/VDZLZqcbZ2UpOuz4+kAKmbYE9GplxKQZZO7wWEox7Mid/uUdcqEo4QKn
no6ujOuzQzn5a2oOS0k5Hk3uHapNJWlW9YI3LHtfADpYH+6cOR+/c3JWBzQJ6AD7
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qytAsPAILuyL1o1jh28JHcq+v+WYn/FEhjUlH6emhGKGlsAjhUPjzK8MEshNolhj
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JNj2Dr5H0XoLFFnvuvzcRbhlJ9J67JzR+7g=
-----END CERTIFICATE-----
    `,
      },
      async (req, res) => {
        /**
         * endRequest function
         * can be used to prematurely end a request
         */
        const endRequest = (
          statusArg: number = 404,
          messageArg: string = 'This route is not available on this server.',
          headers: plugins.http.OutgoingHttpHeaders = {}
        ) => {
          res.writeHead(statusArg, messageArg);
          res.end(messageArg);
        };

        console.log(`got request: ${req.headers.host}${plugins.url.parse(req.url).path}`);
        const destinationConfig = this.router.routeReq(req);

        if (!destinationConfig) {
          console.log(`${req.headers.host} can't be routed properly. Terminating request.`);
          endRequest();
          return;
        }

        // authentication
        if (destinationConfig.authentication) {
          const authInfo = destinationConfig.authentication;
          switch (authInfo.type) {
            case 'Basic':
              const authHeader = req.headers.authorization;
              if (authHeader) {
                if (!authHeader.includes('Basic ')) {
                  return endRequest(401, 'Authentication required', {
                    'WWW-Authenticate': 'Basic realm="Access to the staging site", charset="UTF-8"',
                  });
                }
                const authStringBase64 = req.headers.authorization.replace('Basic ', '');
                const authString: string = plugins.smartstring.base64.decode(authStringBase64);
                const userPassArray = authString.split(':');
                const user = userPassArray[0];
                const pass = userPassArray[1];
                if (user === authInfo.user && pass === authInfo.pass) {
                  console.log('request successfully authenticated');
                } else {
                  return endRequest(403, 'Forbidden: Wrong credentials');
                }
              }
              break;
            default:
              return endRequest(
                403,
                'Forbidden: unsupported authentication method configured. Please report to the admin.'
              );
          }
        }

        let destinationUrl: string;
        if (destinationConfig) {
          destinationUrl = `http://${destinationConfig.destinationIp}:${destinationConfig.destinationPort}${req.url}`;
        } else {
          return endRequest();
        }
        console.log(destinationUrl);
        const response = await plugins.smartrequest.request(
          destinationUrl,
          {
            method: req.method,
            headers: req.headers,
            keepAlive: true,
          },
          true, // lets make this streaming
          (request) => {
            req.on('data', (data) => {
              request.write(data);
            });
            req.on('end', (data) => {
              request.end();
            });
          }
        );
        res.statusCode = response.statusCode;
        console.log(response.statusCode);
        for (const defaultHeader of Object.keys(this.defaultHeaders)) {
          res.setHeader(defaultHeader, this.defaultHeaders[defaultHeader]);
        }
        for (const header of Object.keys(response.headers)) {
          res.setHeader(header, response.headers[header]);
        }
        response.on('data', (data) => {
          res.write(data);
        });
        response.on('end', () => {
          res.end();
        });
        response.on('error', () => {
          res.end();
        });
        response.on('close', () => {
          res.end();
        });
        response.on('timeout', () => {
          res.end();
        });
      }
    );

    // Enable websockets
    const wss = new plugins.ws.WebSocketServer({ server: this.httpsServer });
    wss.on('connection', (ws: plugins.wsDefault) => {
      console.log('got connection for wsc');
      const wscConnected = plugins.smartpromise.defer();

      const wsc = new plugins.wsDefault(this.router.routeWs(ws), {
        headers: {
          Host: ws.url,
        },
      });
      wsc.on('open', () => {
        wscConnected.resolve();
      });

      ws.on('message', async (message) => {
        await wscConnected.promise;
        wsc.emit('message', message);
      });
      wsc.on('message', (message) => {
        ws.emit('message', message);
      });

      // handle closing
      const cleanUp = () => {
        ws.removeAllListeners();
        ws.close();
        ws.terminate();
        wsc.removeAllListeners();
        wsc.close();
        wsc.terminate();
      };

      ws.on('close', (message) => {
        cleanUp();
      });
      wsc.on('close', (message) => {
        cleanUp();
      });
    });
    this.httpsServer.keepAliveTimeout = 61000;
    this.httpsServer.headersTimeout = 65000;

    this.httpsServer.on('connection', (connection: plugins.net.Socket) => {
      connection.setTimeout(10000);
      let destroyed = false;
      this.socketMap.add(connection);
      console.log(`added connection. now ${this.socketMap.getArray().length} sockets connected.`);
      const destroyConnection = () => {
        if (!destroyed) {
          destroyed = true;
          connection.destroy();
          console.log(`socket successfully destroyed.`);
          plugins.smartdelay.delayFor(1000).then(() => {
            connection.removeAllListeners();
          });
        }
      }
      const cleanupConnection = () => {
        if (this.socketMap.checkForObject(connection)) {
          this.socketMap.remove(connection);
          plugins.smartdelay.delayFor(200).then(() => {
            destroyConnection();
          });
          console.log(`removed connection. ${this.socketMap.getArray().length} sockets remaining.`);
          connection.end(() => {
            destroyConnection();
          });
        }
      };
      connection.on('close', () => {
        cleanupConnection();
      });
      connection.on('error', () => {
        cleanupConnection();
      });
      connection.on('end', () => {
        cleanupConnection();
      });
      connection.on('timeout', () => {
        cleanupConnection();
      });
    });

    this.httpsServer.listen(this.options.port);
    console.log(
      `ProxyWorker -> OK: now listening for new connections on port ${this.options.port}`
    );
  }

  public async updateProxyConfigs(proxyConfigsArg: plugins.tsclass.network.IReverseProxyConfig[]) {
    console.log(`got new proxy configs`);
    this.proxyConfigs = proxyConfigsArg;
    this.router.setNewProxyConfigs(proxyConfigsArg);
    for (const hostCandidate of this.proxyConfigs) {
      // console.log(hostCandidate);

      const existingHostNameConfig = this.alreadyAddedReverseConfigs[hostCandidate.hostName];

      if (!existingHostNameConfig) {
        this.alreadyAddedReverseConfigs[hostCandidate.hostName] = hostCandidate;
      } else {
        if (
          existingHostNameConfig.publicKey === hostCandidate.publicKey &&
          existingHostNameConfig.privateKey === hostCandidate.privateKey
        ) {
          continue;
        } else {
          this.alreadyAddedReverseConfigs[hostCandidate.hostName] = hostCandidate;
        }
      }

      this.httpsServer.addContext(hostCandidate.hostName, {
        cert: hostCandidate.publicKey,
        key: hostCandidate.privateKey,
      });
      this.httpsServer;
    }
  }

  public async addDefaultHeaders(headersArg: { [key: string]: string }) {
    for (const headerKey of Object.keys(headersArg)) {
      this.defaultHeaders[headerKey] = headersArg[headerKey];
    }
  }

  public async stop() {
    const done = plugins.smartpromise.defer();
    this.httpsServer.close(() => {
      done.resolve();
    });
    await this.socketMap.forEach(async (socket) => {
      socket.destroy();
    });
    await done.promise;
  }
}