haibu-ishiki/lib/proxy.js

Node deployment server - wrapper for haibu, http-proxy and carapace with permissions and automatic node versions

/*
 The MIT License

 Copyright (c) 2013 Hadrien Jouet https://github.com/grownseed

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */

var http_proxy = require('http-proxy'),
  proxyModel = require('../models/proxy');

var Proxy = exports.Proxy = function(app, haibu) {
  var self = this;

  this.proxies = {};

  //small proxy api
  app.router.path('/proxies', function() {
    //return all proxy routes for all ports
    this.get(function() {
      var proxies = {};

      Object.keys(self.proxies).forEach(function(port) {
        if (!proxies[port])
          proxies[port] = {};

        proxies[port] = self.getBy(port);
      });

      haibu.sendResponse(this.res, 200, proxies);
    });

    //return all proxy routes for a given port
    this.get('/:port', function(port) {
      if (self.proxies[port])
        haibu.sendResponse(this.res, 200, self.getBy(port));
      else
        haibu.sendResponse(this.res, 500, {'message': 'No proxy on port ' + port});
    });

    //start a proxy on a given port
    this.post('/:port', function(port) {
      if (self.start(port))
        haibu.sendResponse(this.res, 200, {message: 'Proxy started on ' + port});
      else
        haibu.sendResponse(this.res, 500, {message: 'Could not start proxy on ' + port});
    });

    //set an arbitrary proxy route
    this.post('/:port/set', function(port) {
      if (self.proxies[port]) {
        var pkg = {
          host: this.req.body.host,
          port: this.req.body.port
        };

        var route_message = this.req.body.domain + ':' + port + ' > ' + pkg.host + ':' + pkg.port;

        if (self.set(port, pkg, this.req.body.domain, true))
          haibu.sendResponse(this.res, 200, {message: 'Proxy route added: ' + route_message});
        else
          haibu.sendResponse(this.res, 500, {message: 'Could not create route: ' + route_message});
      }else{
        haibu.sendResponse(this.res, 500, {message: 'No proxy on port ' + port});
      }
    });

    //delete proxy on a given port
    this.post('/:port/delete_proxy', function(port) {
      if (self.clean(port)) {
        haibu.sendResponse(this.res, 200, {message: 'Proxy no longer running on ' + port});
      }else{
        haibu.sendResponse(this.res, 500, {message: 'No proxy on port ' + port});
      }
    });

    //delete all routes on a given port matching the provided filters
    this.post('/:port/delete_route', function(port) {
      if (self.proxies[port]) {
        if (this.req.body.domain) {
          var domain = this.req.body.domain.trim();

          result = self.delete(port, domain);

          message = (result ? 'Route deleted' : 'No route found') + ' for ' + domain + ' on port ' + port;
        }else{
          var match = this.req.body || {},
            filters = [];

          result = self.deleteBy(port, match);

          message = (result ? 'Routes deleted' : 'No routes found') + ' for ';

          Object.keys(match).forEach(function(key) {
            filters.push(key + ' ' + match[key]);
          });

          message += filters.join(', ') + ' on port ' + port;
        }

        if (result)
          haibu.sendResponse(this.res, 200, {message: message});
        else
          haibu.sendResponse(this.res, 500, {message: message});
      }else{
        haibu.sendResponse(this.res, 500, {message: 'No proxy on port ' + port});
      }
    });

    //get proxy routes for given port and user
    this.get('/:port/:userid', function(port, userid) {
      haibu.sendResponse(this.res, 200, self.getBy(port, {user: userid}));
    });

    //get proxy routes for given port, user and app
    this.get('/:port/:userid/:appid', function(port, userid, appid) {
      haibu.sendResponse(this.res, 200, self.getBy(port, {user: userid, appid: appid}));
    });

    //delete proxy routes for given port, user and app
    this.post('/:port/:userid/:appid/delete', function(port, userid, appid) {
      var message = 'routes for user ' + userid + ', app ' + appid + ' on  port ' + port;

      if (self.deleteBy(port, {user: userid, appid: appid}))
        haibu.sendResponse(this.res, 200, {message: 'Deleted ' + message});
      else
        haibu.sendResponse(this.res, 500, {message: 'Could not delete ' + message});
    });
  });
};

//starts a new proxy on given port
Proxy.prototype.start = function(port) {
  if (!this.proxies[port]) {
    var self = this;

    this.proxies[port] = {routes: {}};

    this.proxies[port].proxy = http_proxy.createServer(function(req, res, proxy) {
      //find target associated to domain
      var host = req.headers.host.split(':'),
        port = host[1] || 80;

      host = host[0];

      if (self.proxies[port].routes[host]) {
        //forward request to target
        proxy.proxyRequest(req, res, self.proxies[port].routes[host]);
      }
    });

    this.proxies[port].proxy.on('error', function(err) {
      //if proxy failed to start, remove it
      console.log('Could not start proxy on ' + port, err);
      delete self.proxies[port];
    });

    this.proxies[port].proxy.listen(port);

    return true;
  }

  return false;
};

//stops proxy on given port
Proxy.prototype.stop = function(port) {
  if (this.proxies[port]) {
    this.proxies[port].proxy.close();

    return true;
  }

  return false;
};

//stops and removes proxy entirely
Proxy.prototype.clean = function(port) {
  if (this.stop(port)) {
    delete this.proxies[port];

    return true;
  }

  return false;
};

//sets domain target
Proxy.prototype.set = function(port, pkg, domain, persist) {
  if (domain.trim() != '' && this.proxies[port] && pkg.host) {
    var target_port = (pkg.env ? pkg.env.PORT : null) || pkg.port;

    if (target_port) {
      this.proxies[port].routes[domain] = {
        host: pkg.host,
        port: target_port,
        user: pkg.user,
        appid: pkg.name,
        persist: persist
      };

      //save to db if persistent
      if (persist)
        proxyModel.createOrUpdate({host: domain, port: port}, this.proxies[port].routes[domain], function(){});

      return true;
    }
  }

  return false;
};

//load all routes by key values
Proxy.prototype.getBy = function(port, match) {
  if (this.proxies[port]) {
    var match = match || {},
      keys = Object.keys(match),
      domains = Object.keys(this.proxies[port].routes),
      routes = {},
      self = this;

    domains.forEach(function(domain) {
      var matched = true;

      for (var i in keys) {
        if (!self.proxies[port].routes[domain][keys[i]] || self.proxies[port].routes[domain][keys[i]] != match[keys[i]]) {
          matched = false;
          break;
        }
      }

      if (matched) {
        routes[domain] = self.proxies[port].routes[domain];

        //json-unfriendly 'target' gets added by http-proxy
        if (routes[domain].target)
          delete routes[domain].target;
      }
    });

    return routes;
  }

  return false;
};

//delete domain target
Proxy.prototype.delete = function(port, domain) {
  if (this.proxies[port] && this.proxies[port].routes[domain]) {
    //remove from db if persistent
    if (this.proxies[port].routes[domain].persist)
      proxyModel.deleteBy({source: {host: domain, port: port}}, console.log);

    delete this.proxies[port].routes[domain];

    return true;
  }

  return false;
};

//delete by key values
Proxy.prototype.deleteBy = function(port, match) {
  var self = this;

  if (this.proxies[port]) {
    Object.keys(this.getBy(port, match)).forEach(function(domain) {
      self.delete(port, domain);
    });

    return true;
  }

  return false;
};

//load all the domains from a package
Proxy.prototype.load = function(port, pkg) {
  var self = this;

  if (this.proxies[port]) {
    ['domain', 'domains', 'subdomain', 'subdomains'].forEach(function(key) {
      if (pkg[key]) {
        var domains = pkg[key];

        if (typeof domains == 'string')
          domains = domains.split(' ');

        domains.forEach(function(domain) {
          self.set(port, pkg, domain);
        });
      }
    });

    return true;
  }

  return false;
};

//load all persistent routes from db
Proxy.prototype.autoload = function() {
  var self = this;

  proxyModel.get(function(err, routes) {
    if (err)
      return console.log(err);

    if (routes.length > 0) {
      routes.forEach(function(route) {
        //create proxy if it doesn't exist
        if (!self.proxies[route.source.port])
          self.start(route.source.port);

        self.set(route.source.port, route.target, route.source.host, true);
      });
    }
  });
};