u/server/filter/method.ts


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import {
    Either,
    type ITraceable,
    LogLevel,
    PenguenoError,
    type PenguenoRequest,
    type RequestFilter,
    type ServerTrace,
    TraceUtil,
} from '@emprespresso/pengueno';

type HttpMethod = 'POST' | 'GET' | 'HEAD' | 'PUT' | 'DELETE' | 'CONNECT' | 'OPTIONS' | 'TRACE' | 'PATCH';

export const requireMethod =
    (methods: Array<HttpMethod>): RequestFilter<HttpMethod> =>
    (req: ITraceable<PenguenoRequest, ServerTrace>) =>
        req
            .bimap(TraceUtil.withFunctionTrace(requireMethod))
            .move(Promise.resolve(req.get()))
            .map(
                TraceUtil.promiseify((t) => {
                    const { method: _method } = t.get();
                    const method = <HttpMethod>_method;
                    if (!methods.includes(method)) {
                        const msg = "that's not how you pet me (⋟﹏⋞)~";
                        t.trace.addTrace(LogLevel.WARN).trace(msg);
                        return Either.left<PenguenoError, HttpMethod>(new PenguenoError(msg, 405));
                    }
                    return Either.right<PenguenoError, HttpMethod>(method);
                }),
            )
            .get();