Add basic response factories and helpers

src/http/lifecycle/Request.ts

@@ -5,7 +5,7 @@ import {HTTPCookieJar} from "../kernel/HTTPCookieJar";
 import {TLSSocket} from "tls";
 import * as url from "url";
 import {Response} from "./Response";
-import {ActivatedRoute} from "../routing/ActivatedRoute";
+import * as Negotiator from "negotiator";
 
 // FIXME - add others?
 export type HTTPMethod = 'post' | 'get' | 'patch' | 'put' | 'delete' | 'unknown';
@@ -41,6 +41,7 @@ export class Request extends ScopedContainer {
     public readonly isXHR: boolean;
     public readonly address: HTTPSourceAddress;
     public readonly response: Response;
+    public readonly mediaTypes: string[];
 
     constructor(
         protected clientRequest: IncomingMessage,
@@ -98,6 +99,7 @@ export class Request extends ScopedContainer {
             port
         }
 
+        this.mediaTypes = (new Negotiator(clientRequest)).mediaTypes()
         this.response = new Response(this, serverResponse)
     }
 
@@ -115,10 +117,33 @@ export class Request extends ScopedContainer {
         }
     }
 
-    // session
-    // route
-    // respond
-    // body
+    accepts(type: string) {
+        if ( type === 'json' ) type = 'application/json'
+        else if ( type === 'xml' ) type = 'application/xml'
+        else if ( type === 'html' ) type = 'text/html'
+
+        type = type.toLowerCase()
+
+        const possible = [
+            type,
+            type.split('/')[0] + '/*',
+            '*/*'
+        ]
+
+        return this.mediaTypes.some(media => possible.includes(media.toLowerCase()))
+    }
+
+    wants(): 'html' | 'json' | 'xml' | 'unknown' {
+        const jsonIdx = this.mediaTypes.indexOf('application/json') ?? this.mediaTypes.indexOf('application/*') ?? this.mediaTypes.indexOf('*/*')
+        const xmlIdx = this.mediaTypes.indexOf('application/xml') ?? this.mediaTypes.indexOf('application/*') ?? this.mediaTypes.indexOf('*/*')
+        const htmlIdx = this.mediaTypes.indexOf('text/html') ?? this.mediaTypes.indexOf('text/*') ?? this.mediaTypes.indexOf('*/*')
+
+        if ( htmlIdx >= 0 && htmlIdx <= jsonIdx && htmlIdx <= xmlIdx ) return 'html'
+        if ( jsonIdx >= 0 && jsonIdx <= htmlIdx && jsonIdx <= xmlIdx ) return 'json'
+        if ( xmlIdx >= 0 && xmlIdx <= jsonIdx && xmlIdx <= htmlIdx ) return 'xml'
+        return 'unknown'
+    }
+
     // hostname
 
     /*
@@ -127,8 +152,7 @@ export class Request extends ScopedContainer {
     fresh/stale - cache
     remote ips (proxy)
     signedCookies
-    accepts content type, charsets, encodings, languages
-    is content type (wants)
+    accepts charsets, encodings, languages
     range header parser
      */
 }