@expressive-analytics/deep-thought-service/src/DTResponse.ts

Typescript conversion of Deep Thought Services (formerly providers)

import {DTModel} from '@expressive-analytics/deep-thought-js'

export enum DTErr {
  NONE = 0,
  INVALID_KEY,
  FAILED_QUERY,
  PROHIBITED_ACTION,
  UNAUTHORIZED_TOKEN,
	OAUTH_CONSUMER_KEY_REFUSED
}

export class DTResponse{
	public obj;
	protected err = 0;
	public as_proxy = false;
  rsp

	constructor(rsp,obj?,err=0){
		this.obj = obj;
		this.err = err;
    this.rsp = rsp
	}

	sendHeader(header:string){
		//this.rsp.setHeader(header)
		this.rsp.writeHead(header)
	}

	setResponse(obj){
		this.obj = obj;
	}

	error(code?){
		if(code!==undefined)
			this.err = parseInt(code);
		return this.err;
	}

	/** Converts the +obj+ to a form it can be rendered.
		For DTModels, these are only the public properties. */
	objectAsRenderable(obj?,$public?){
		if(obj===null)
			return null
		let renderable
		if(obj instanceof DTModel){
			if($public===undefined)
				renderable = obj.toJson();
			else
				renderable = obj.to($public)
		} else if(Array.isArray(obj)){
      renderable = []
      for(let v of obj)
        renderable.push(this.objectAsRenderable(v,$public))
    } else if (typeof obj === 'object'){
      renderable = {}
      Object.entries(obj).forEach(([k,v],index)=>{
        renderable[k] = this.objectAsRenderable(v);
      })
    } else
			renderable = obj;
		return renderable;
	}

//===================
//! Rendering Methods
//===================
	renderAsDTR(){
		let response = {"fmt":"DTR","err":this.err,"obj":this.objectAsRenderable(this.obj)};
		this.render(JSON.stringify(response));
	}

	renderAsJSON(){
		this.render(JSON.stringify(this.objectAsRenderable(this.obj)));
	}

	render(str){
		this.rsp.end(str);
	}

	respond(params={}){
    const fmt = (typeof params["fmt"] === 'undefined')?"dtr":params["fmt"]
		if(this.err >= 400) // put this in the header
			this.rsp.sendStatus(this.err);
		else{
			switch(fmt){
				case "json":
					this.renderAsJSON();
					break;
				default:
					this.renderAsDTR();
			}
		}
	}
}