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import {
Either,
FourOhFourActivityImpl,
HealthCheckActivityImpl,
type HealthChecker,
HealthCheckOutput,
type IFourOhFourActivity,
type IHealthCheckActivity,
type ITraceable,
PenguenoRequest,
PenguenoResponse,
Server,
type ServerTrace,
} from '@emprespresso/pengueno';
import { Storage } from '../storage/index.js';
import {
TokenGenerateActivityImpl,
WebhookActivityImpl,
type ITokenGenerateActivity,
type IWebhookActivity,
} from '../activity/index.js';
import { TokenSigner } from '../token/index.js';
const defaultHealthCheck: HealthChecker = async (input) => {
void input.get();
return Either.right(HealthCheckOutput.YAASSSLAYQUEEN);
};
type CorsOriginRule =
| { kind: 'origin'; origin: string }
| { kind: 'host'; host: string; port?: string }
| { kind: 'wildcard-host'; suffix: string };
type AllowedCorsOrigins = '*' | CorsOriginRule[];
const parseAllowedCorsOrigins = (raw: string): AllowedCorsOrigins => {
const trimmed = raw.trim();
if (trimmed === '' || trimmed === '*') {
return '*';
}
const rules = trimmed
.split(',')
.map((entry) => entry.trim())
.filter((entry) => entry.length > 0)
.flatMap<CorsOriginRule>((entry) => {
// Full origin (scheme + host [+ port])
if (entry.includes('://')) {
try {
const parsed = new URL(entry);
return [{ kind: 'origin', origin: parsed.origin }];
} catch {
return [];
}
}
// Wildcard hostname (matches any subdomain, not apex)
if (entry.startsWith('*.')) {
const suffix = entry.slice(2).toLowerCase();
return suffix.length > 0 ? [{ kind: 'wildcard-host', suffix }] : [];
}
// Hostname (optionally with :port)
const hostPortMatch = entry.match(/^(.+?)(?::(\d+))?$/);
if (!hostPortMatch) {
return [];
}
const host = hostPortMatch[1]!.toLowerCase();
const port = hostPortMatch[2];
if (host.length === 0) {
return [];
}
return [{ kind: 'host', host, port }];
});
return rules.length === 0 ? '*' : rules;
};
export class PosthookServer implements Server {
constructor(
storage: Storage,
signer: TokenSigner,
corsOriginsRaw: string = '*',
healthCheck: HealthChecker = defaultHealthCheck,
private readonly healthCheckActivity: IHealthCheckActivity = new HealthCheckActivityImpl(healthCheck),
private readonly webhookActivity: IWebhookActivity = new WebhookActivityImpl(storage, signer),
private readonly tokenGenerateActivity: ITokenGenerateActivity = new TokenGenerateActivityImpl(storage, signer),
private readonly fourOhFourActivity: IFourOhFourActivity = new FourOhFourActivityImpl(),
private readonly corsOrigins: AllowedCorsOrigins = parseAllowedCorsOrigins(corsOriginsRaw),
) {}
private corsHeaders(origin: string | undefined): Record<string, string> {
if (origin === undefined) {
return {};
}
// Special case: allow everything (including http origins).
if (this.corsOrigins === '*') {
return {
'Access-Control-Allow-Origin': '*',
};
}
let parsed: URL;
try {
parsed = new URL(origin);
} catch {
return {};
}
// If we're restricting origins, only allow https.
if (parsed.protocol !== 'https:') {
return {};
}
const candidateOrigin = parsed.origin;
const hostname = parsed.hostname.toLowerCase();
const port = parsed.port;
const allowed = this.corsOrigins.some((rule) => {
if (rule.kind === 'origin') {
return candidateOrigin === rule.origin;
}
if (rule.kind === 'host') {
if (hostname !== rule.host) {
return false;
}
return rule.port === undefined ? true : rule.port === port;
}
// wildcard-host
if (hostname === rule.suffix) {
return false;
}
return hostname.endsWith(`.${rule.suffix}`);
});
if (!allowed) {
return {};
}
return {
'Access-Control-Allow-Origin': candidateOrigin,
};
}
private corsPreflightHeaders(requestedHeaders: string | undefined): Record<string, string> {
const allowHeaders =
requestedHeaders?.trim() ?? 'Content-Type, X-CSRF-Token, H-Captcha-Response, Authorization, Accept, Origin';
return {
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': allowHeaders,
'Access-Control-Max-Age': '86400',
};
}
private applyCorsHeaders(res: PenguenoResponse, headers: Record<string, string>) {
for (const [key, value] of Object.entries(headers)) {
res.headers[key] = value;
}
}
public async serve(req: ITraceable<PenguenoRequest, ServerTrace>): Promise<PenguenoResponse> {
const penguenoReq = req.get().req;
const method = penguenoReq.method;
const requestHeaders = penguenoReq.header();
const origin = requestHeaders['origin'];
const corsHeaders = this.corsHeaders(origin);
// Handle CORS preflight.
if (method === 'OPTIONS' && origin !== undefined && Object.keys(corsHeaders).length > 0) {
return new PenguenoResponse(req, '', {
status: 204,
statusText: 'No Content',
headers: {
...corsHeaders,
...this.corsPreflightHeaders(requestHeaders['access-control-request-headers']),
},
});
}
const url = new URL(penguenoReq.url);
const { pathname } = url;
let result: Promise<PenguenoResponse>;
// === Public Routes (/) ===
if (pathname === '/health') {
result = this.healthCheckActivity.checkHealth(req);
} else {
// Token generation endpoint - /hook/{routeName}/token
const tokenMatch = pathname.match(/^\/hook\/([^/]+)\/token$/);
if (tokenMatch && method === 'GET') {
const routeName = tokenMatch[1];
result = this.tokenGenerateActivity.generateToken(routeName)(req);
} else {
// Dynamic webhook endpoints - /hook/{routeName}
const hookMatch = pathname.match(/^\/hook\/([^/]+)$/);
if (hookMatch && method === 'POST') {
const routeName = hookMatch[1];
result = this.webhookActivity.processWebhook(routeName)(req);
} else {
// 404 for everything else
result = this.fourOhFourActivity.fourOhFour(req);
}
}
}
const response = await result;
if (Object.keys(corsHeaders).length > 0) {
this.applyCorsHeaders(response, corsHeaders);
}
return response;
}
}
|
