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cors.ts
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cors.ts
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import Context from './context.ts';
import Plugin from './plugin.ts';
export default class Cors implements Plugin {
#get: Map<string, string> = new Map();
#head: Map<string, string> = new Map();
#post: Map<string, string> = new Map();
#put: Map<string, string> = new Map();
#delete: Map<string, string> = new Map();
#connect: Map<string, string> = new Map();
#options: Map<string, string> = new Map();
#trace: Map<string, string> = new Map();
#patch: Map<string, string> = new Map();
#any: Map<string, string> = new Map();
get (path: string, origin: string) { this.#get.set(path, origin); return this; }
head (path: string, origin: string) { this.#head.set(path, origin); return this; }
post (path: string, origin: string) { this.#post.set(path, origin); return this; }
put (path: string, origin: string) { this.#put.set(path, origin); return this; }
delete (path: string, origin: string) { this.#delete.set(path, origin); return this; }
connect (path: string, origin: string) { this.#connect.set(path, origin); return this; }
options (path: string, origin: string) { this.#options.set(path, origin); return this; }
trace (path: string, origin: string) { this.#trace.set(path, origin); return this; }
patch (path: string, origin: string) { this.#patch.set(path, origin); return this; }
any (path: string, origin: string) { this.#any.set(path, origin); return this; }
handle (context: Context) {
const method = context.method;
const path = context.url.pathname;
let paths;
switch (method) {
case 'get': paths = this.#get; break;
case 'head': paths = this.#head; break;
case 'post': paths = this.#post; break;
case 'put': paths = this.#put; break;
case 'delete': paths = this.#delete; break;
case 'connect': paths = this.#connect; break;
case 'options': paths = this.#options; break;
case 'trace': paths = this.#trace; break;
case 'patch': paths = this.#patch; break;
default: throw new Error('Cors - not valid method');
}
if (!paths.has(path) && !paths.has('*') && !paths.has('/*') &&
!this.#any.has(path) && !this.#any.has('*') && !this.#any.has('/*')) return;
const origin =
paths.get(path) ?? paths.get('*') ?? paths.get('/*') ??
this.#any.get(path) ?? this.#any.get('*') ?? this.#any.get('/*');
if (!origin) throw new Error('Cors - origin not valid');
context.headers.append('Access-Control-Allow-Origin', origin);
}
}