library-ts/node/users/RequestHandler.ts

import { RJLog } from "../log/RJLog";
import { RequestRequirement } from "./requirements/RequestRequirement";
import { UserManagementServer } from "./UserManagementServer";
import { FastifyRequest, FastifyReply } from 'fastify';
import { Message } from "../../browser/messages/Message";
import { UserData } from "./UserData";
import { UAParser } from 'ua-parser-js';
import { LocationData } from "./location/LocationData";
import { className } from "../../browser/tools/TypeUtilities";

export enum RequestType
{
  GET,
  POST
}

export abstract class RequestHandler
{

  _ums:UserManagementServer;
  
  get ums(){ return this._ums; };

  _type:RequestType;
  _url:string;


  requirements:RequestRequirement[] = [];

  get app(){ return this._ums.app };
  get userDB(){ return this._ums.userDB; }

  constructor( rt:RequestType, url:string, requirements:RequestRequirement[] = [] )
  {
    this._url = url;
    this._type = rt;
    this.requirements = requirements;
  }


  async initialize( ums:UserManagementServer ):Promise<void>
  {
    this._ums = ums;
    
    await this._initialize();

    await this._register();

    for ( let r of this.requirements )
    {
      await r.initialize( this );
    }

    return Promise.resolve();
  }

  protected _register():Promise<void>
  {
    RJLog.log( RequestType[ this._type ], this._url ); 

    if ( RequestType.GET == this._type )
    {      
      this.app.get( this._url, ( request, reply ) => { this.handle( request, reply ); } );
    }
    else if ( RequestType.POST == this._type )
    {
      this.app.post( this._url, ( request, reply ) => { this.handle( request, reply ); } );
    }

    return Promise.resolve();
  }

  protected _currentRequest:FastifyRequest;
  protected _currentReply:FastifyReply;

  async handle( request:FastifyRequest, reply:FastifyReply ):Promise<void>
  {
    if ( ! request || ! reply )
    {
      RJLog.warn( "Aborting request:", "Request:", ! request, "Reply:", ! reply );
      return Promise.resolve();
    }

    this._currentRequest = request;
    this._currentReply = reply;

    RJLog.log( "Processing request:", "Request:", request.url, request.ip );

    for ( let r of this._ums.globalRequirements )
    {
      let messages = await r.handle( request, reply );

      if ( Message.hasError( messages ) )
      {
        RJLog.log( "Global Requirement not fullfilled: ", className( r ), messages.map( m => JSON.stringify( m ) ).join( ", " ) );

        return this.sendError( "Error during global requirements check" );
      }
    }   

    for ( let r of this.requirements )
    {
      let messages = await r.handle( request, reply );

      if ( Message.hasError( messages ) )
      {
        RJLog.log( messages[ 0 ].content );
        RJLog.log( "Requirement not fullfilled: ", className( r ), messages.map( m => JSON.stringify( m ) ).join( ", " ) );

        return this.sendError( "Error during requirements check" );
      }
    }    
    
   
    await this._handle( request, reply );

    this._currentRequest = null;
    this._currentReply = null;

    return Promise.resolve();
  }

  protected _initialize():Promise<void>
  {
    return Promise.resolve();
  };

  protected abstract _handle( request:FastifyRequest, reply:FastifyReply ):Promise<void>;


  
  get ip()
  {
    return this._currentRequest.ip;
  }


  get userAgent()
  {
    return this._currentRequest.headers[ "user-agent" ];
  }

  getLocation():Promise<LocationData>
  {
    return this._ums.location.getLocation( this.ip );
  }

  protected sendJSON( obj:any ):Promise<void>
  {
    this._currentReply.send( obj );
    return Promise.resolve();
  }

  getUser():Promise<UserData>
  {    
    let request = this._currentRequest;
    let requestBody = request.body;
    let tokenData = requestBody as { token:string };
    let tokenID = tokenData.token;

    let session = this._ums._sessions.get( tokenID );
    return this._ums.userDB.byID( session.userID );
  }

  protected sendInfo( info:string ):Promise<void>
  {
    RJLog.log( info );
    return this.sendJSON( Message.Info( info ) );
  }

  protected sendError( error:string, with400ErrorCode:boolean = true ):Promise<void>
  {
    RJLog.log( error );

    if ( with400ErrorCode ) 
    {
      this._currentReply.code( 400 );
    }

    return this.sendJSON( Message.Error( error ) ); 
  }

  protected sendEmail( to:string, title:string, message:string )
  {
    this._ums.sendEmail( to, title, message );
  }

  protected sendDataInfo( info:string, data:any )
  {
    let json = Message.Info( info ) as any;
    json.data = data;
    return this.sendJSON( json );
  }
}