Ionic 2 Rest Provider

rest.js

import { Injectable } from '@angular/core';
import { Http, Headers } from '@angular/http';
import 'rxjs/add/operator/map';

const BASEURL = "BASEURL";

@Injectable()
export class RestProvider {

	constructor(public http: Http) {
		console.log('Hello RestProvider Provider');
	}

	headers(authenticated: boolean = false){
		let headers = new Headers();

	  	headers.append('Content-Type', 'application/json');
	  	headers.append('Accept', 'application/json');

	  	if(authenticated){
	  		let token = this.retrieve('token');
			headers.append('Authorization', 'Bearer ' + token);
	  	}

	  	return headers;
	}


	get(url: string, authenticated: boolean = false){

		let headers = this.headers(authenticated);

		return this.http.get(BASEURL + url, { headers: headers}).map(res => res.json());

	}

	post(url: string, data: any = null, authenticated: boolean = false){
		let headers = this.headers(authenticated);

		return this.http.post(BASEURL + url, data, { headers: headers}).map(res => res.json());
	}

	put(url: string, data: any = null, authenticated: boolean = false){
		let headers = this.headers(authenticated);

		return this.http.put(BASEURL + url, data, { headers: headers}).map(res => res.json());
	}

	delete(url: string, authenticated: boolean = false){
		let headers = this.headers(authenticated);

		return this.http.delete(BASEURL + url, { headers: headers}).map(res => res.json());
	}

	store(key: string, value: any){
		localStorage.setItem(key, value);
	}

	remove(key){
		localStorage.removeItem(key);
	}

	retrieve(key: string){
		return localStorage.getItem(key);
	}

	destroyStorage(){
		localStorage.clear();
	}
}