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| 1 | +export interface HttpAdapter { |
| 2 | + listen( |
| 3 | + endpoint: string, |
| 4 | + handler: (req: any, res: any) => Promise<any>, |
| 5 | + ...args: any[] |
| 6 | + ): Promise<any> | any; |
| 7 | + |
| 8 | + getRequestBody(req: any): Promise<Uint8Array>; |
| 9 | +} |
| 10 | + |
| 11 | +export interface HttpAdapterRequest { |
| 12 | + method: string; |
| 13 | + url: string; |
| 14 | + headers: Record<string, string | string[]>; |
| 15 | +} |
| 16 | + |
| 17 | +export interface HttpAdapterSererResponse { |
| 18 | + headersSent: boolean; |
| 19 | + writeHead(status: number, headers?: Record<string, string>): void; |
| 20 | + end(chunk?: string): void; |
| 21 | +} |
| 22 | + |
| 23 | +class WorkerServerResponse implements HttpAdapterSererResponse { |
| 24 | + private statusCode = 200; |
| 25 | + private headers: Record<string, string> = {}; |
| 26 | + private chunks: Uint8Array<ArrayBuffer>[] = []; |
| 27 | + |
| 28 | + public headersSent: boolean = false; |
| 29 | + private resolved = false; |
| 30 | + private resolveResponsePromise?: () => void; |
| 31 | + |
| 32 | + writeHead(status: number, headers?: Record<string, string>) { |
| 33 | + if (this.headersSent) { |
| 34 | + throw new Error("Cannot modify headers after they have been sent."); |
| 35 | + } |
| 36 | + this.statusCode = status; |
| 37 | + if (headers) Object.assign(this.headers, headers); |
| 38 | + } |
| 39 | + |
| 40 | + end(chunk?: string) { |
| 41 | + if (this.headersSent) { |
| 42 | + throw new Error("Cannot send body after headers have been sent."); |
| 43 | + } |
| 44 | + if (chunk) this.chunks.push(new TextEncoder().encode(chunk)); |
| 45 | + this.headersSent = true; |
| 46 | + if (!this.resolved) { |
| 47 | + this.resolved = true; |
| 48 | + |
| 49 | + if (this.resolveResponsePromise) { |
| 50 | + this.resolveResponsePromise(); // promise revoled |
| 51 | + } |
| 52 | + } |
| 53 | + } |
| 54 | + |
| 55 | + toResponse(): Response { |
| 56 | + const body = this.chunks.length ? new Blob(this.chunks) : null; |
| 57 | + return new Response(body, { |
| 58 | + status: this.statusCode, |
| 59 | + headers: this.headers, |
| 60 | + }); |
| 61 | + } |
| 62 | + async waitForResponse(): Promise<void> { |
| 63 | + return new Promise((resolve) => { |
| 64 | + if (this.resolved) { |
| 65 | + resolve(); |
| 66 | + } else { |
| 67 | + this.resolveResponsePromise = resolve; // Resolve when end() is called |
| 68 | + } |
| 69 | + }); |
| 70 | + } |
| 71 | +} |
| 72 | + |
| 73 | +class WorkerIncomingMessage implements HttpAdapterRequest { |
| 74 | + headers: Record<string, string | string[]> = {}; |
| 75 | + url: string; |
| 76 | + method: string; |
| 77 | + constructor(private request: Request) { |
| 78 | + request.headers.get("test"); |
| 79 | + request.headers.forEach((value, key) => { |
| 80 | + this.headers[key] = value; |
| 81 | + }); |
| 82 | + /* |
| 83 | + * "https://domain.name/endpoint/endpoint1?query=124".split('/') => ["https", "", "endpoint", "endpoint2?query=123"] |
| 84 | + * .slice(3) => ["endpoint", "endpoint2"] |
| 85 | + * join('/') => endpoint/endpoint2?query=123 |
| 86 | + * "/" + endpoint/endpoint2?query=123 => /endpoint/endpoint2?query=123 |
| 87 | + */ |
| 88 | + this.url = "/" + request.url.split("/").slice(3).join("/"); |
| 89 | + this.method = request.method; |
| 90 | + this.request = request; |
| 91 | + } |
| 92 | + arrayBuffer(): Promise<ArrayBuffer> { |
| 93 | + return this.request.arrayBuffer(); |
| 94 | + } |
| 95 | +} |
| 96 | + |
| 97 | +/** |
| 98 | + * Adapter for using discord.https with Cloudflare Workers. |
| 99 | + * |
| 100 | + * This class implements the HttpAdapter interface and provides |
| 101 | + * methods to handle incoming requests and send responses in a |
| 102 | + * Cloudflare Worker environment. |
| 103 | + * |
| 104 | + * |
| 105 | + * |
| 106 | + * @example |
| 107 | + * const adapter = new CloudflareAdapter(); |
| 108 | + * |
| 109 | + * export default { |
| 110 | + * // Cloudflare Workers entry point |
| 111 | + * async fetch(request, env, ctx) { |
| 112 | + * const client = new Client({ |
| 113 | + * token: env.DISCORD_BOT_TOKEN, |
| 114 | + * publicKey: env.DISCORD_PUBLIC_KEY, |
| 115 | + * httpAdapter: adapter, |
| 116 | + * debug: true, |
| 117 | + * }); |
| 118 | + * |
| 119 | + * // Register your routes |
| 120 | + * client.register(UtilityRoute, HelloRoute); |
| 121 | + * |
| 122 | + * // Handle Discord interactions on the "/interactions" endpoint |
| 123 | + * return await client.listen("interactions", request); |
| 124 | + * } |
| 125 | + * } |
| 126 | + */ |
| 127 | + |
| 128 | +class CloudflareAdapter implements HttpAdapter { |
| 129 | + /** |
| 130 | + * |
| 131 | + * @internal |
| 132 | + * |
| 133 | + */ |
| 134 | + async listen( |
| 135 | + endpoint: string, |
| 136 | + handler: (req: any, res: any) => Promise<void>, |
| 137 | + request: Request |
| 138 | + ) { |
| 139 | + const req = new WorkerIncomingMessage(request); |
| 140 | + const res = new WorkerServerResponse(); |
| 141 | + |
| 142 | + // It took almost an entire hour to debug this... |
| 143 | + // Weirdly, although res.waitForResponse() is blocking execution and waiting for the handler, which was working outside the javascript event loop, |
| 144 | + // Cloudflare just cancels the request for some reason?? |
| 145 | + // Now, after adding await, it works? |
| 146 | + // Trust me, waitForResponse is blocking and will never allow execution to pass unless the .end() method from WorkerServerResponse is invoked. |
| 147 | + // Whatever, adding await to handler won't hurt... |
| 148 | + |
| 149 | + await handler(req, res); |
| 150 | + await res.waitForResponse(); |
| 151 | + return res.toResponse(); |
| 152 | + } |
| 153 | + |
| 154 | + /** |
| 155 | + * |
| 156 | + * Reads the request body as a Uint8Array. |
| 157 | + * @internal |
| 158 | + * |
| 159 | + */ |
| 160 | + async getRequestBody(req: WorkerIncomingMessage): Promise<Uint8Array> { |
| 161 | + return req.arrayBuffer().then((buffer) => new Uint8Array(buffer)); |
| 162 | + } |
| 163 | +} |
| 164 | +export default CloudflareAdapter; |
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