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

Typescript conversion of Deep Thought Services (formerly providers)

import {HTTPMethod,DTRequest,DTService} from './DTService'
import {DTVerifier} from './DTVerifier'

export class DTRESTService extends DTService{
  protected performAction(action?){
		let obj = this.handleREST(action,this.request.method)
		let str = this.response.objectAsRenderable(obj,this.$public)
    this.setResponse(str)
  }

  protected isMultipleObjects(a){
    return Array.isArray(a)
  }

  protected handleREST(action?:string,method:HTTPMethod="GET"){
    // because OAuth doesn't sign DELETE requests, and doesn't support PATCH,
		// we use POST... we need to map this back to the appropriate logic
		// (see mapping in DTOAuth1Delegate)
		if(action=="actionremove"){
			method="DELETE";
			action = undefined;
		}
		if(action=="actionupsert"){
			method="PATCH";
			action = undefined;
		}

		if(this.actionExists(action)){ // we're already defined, just do it
			this.recordRequest(action);
			return this[action]();
		}

		this.recordRequest(method); // we're using the method to infer the action
		// determine whether this is a collection or individual entity
		const id = this.request.params[this.lookup_column]
		let is_collection = typeof(this.request.params["id"]) === 'undefined' || this.request.params["id"] == ''
		switch(method){
			case "GET":
				if(is_collection)
					return this.actionList();
				else
					return this.actionGet();
			case "DELETE": // delete a resource
				if(is_collection)
					return this.actionRemoveMany();
				else
					return this.actionRemove();
			case "POST": // non-idempotent
				if(is_collection)
					return this.actionCreate();
				else
					return this.actionUpdate();
			case "PUT": // idempotent, full-resource setter
				if(is_collection){
					this.actionRemoveMany();
					return this.actionCreateMany();
				}else{
					this.actionRemove();
					return this.actionCreate();
				}
			case "PATCH": // filter-based upsert
				if(typeof this.request.params["dt_items"] !== 'undefined')
					return this.actionUpsertMany(); // patch-many requires a special param
				else
					return this.actionUpsert();
			default: // e.g. OPTIONS, HEAD
				return null;
		}
		this.response.error(400);
  }
}