@whatwg-node/router/index.mjs

Fetch API compliant HTTP Router

import * as DefaultFetchAPI from '@whatwg-node/fetch';
export { Response, URLPattern } from '@whatwg-node/fetch';
import { createServerAdapter } from '@whatwg-node/server';
export { useCORS, useErrorHandling } from '@whatwg-node/server';

const HTTP_METHODS = [
    'GET',
    'HEAD',
    'POST',
    'PUT',
    'DELETE',
    'CONNECT',
    'OPTIONS',
    'TRACE',
    'PATCH',
];
function createRouterBase({ fetchAPI: givenFetchAPI, base: basePath = '/', } = {}) {
    const fetchAPI = {
        ...givenFetchAPI,
        ...DefaultFetchAPI,
    };
    const routesByMethod = new Map();
    function addHandlersToMethod(method, path, ...handlers) {
        let methodPatternMaps = routesByMethod.get(method);
        if (!methodPatternMaps) {
            methodPatternMaps = new Map();
            routesByMethod.set(method, methodPatternMaps);
        }
        let fullPath = '';
        if (basePath === '/') {
            fullPath = path;
        }
        else if (path === '/') {
            fullPath = basePath;
        }
        else {
            fullPath = `${basePath}${path}`;
        }
        const pattern = new fetchAPI.URLPattern({ pathname: fullPath });
        methodPatternMaps.set(pattern, handlers);
    }
    async function handleRequest(request, context) {
        const method = request.method;
        let _parsedUrl;
        function getParsedUrl() {
            if (!_parsedUrl) {
                _parsedUrl = new fetchAPI.URL(request.url);
            }
            return _parsedUrl;
        }
        const methodPatternMaps = routesByMethod.get(method);
        if (methodPatternMaps) {
            const queryProxy = new Proxy({}, {
                get(_, prop) {
                    const parsedUrl = getParsedUrl();
                    const allQueries = parsedUrl.searchParams.getAll(prop.toString());
                    return allQueries.length === 1 ? allQueries[0] : allQueries;
                },
                has(_, prop) {
                    const parsedUrl = getParsedUrl();
                    return parsedUrl.searchParams.has(prop.toString());
                },
            });
            for (const [pattern, handlers] of methodPatternMaps) {
                const match = pattern.exec(request.url);
                if (match) {
                    const routerRequest = new Proxy(request, {
                        get(target, prop) {
                            if (prop === 'parsedUrl') {
                                return getParsedUrl();
                            }
                            if (prop === 'params') {
                                return new Proxy(match.pathname.groups, {
                                    get(_, prop) {
                                        const value = match.pathname.groups[prop.toString()];
                                        if (value != null) {
                                            return decodeURIComponent(value);
                                        }
                                        return value;
                                    },
                                });
                            }
                            if (prop === 'query') {
                                return queryProxy;
                            }
                            const targetProp = target[prop];
                            if (typeof targetProp === 'function') {
                                return targetProp.bind(target);
                            }
                            return targetProp;
                        },
                        has(target, prop) {
                            return (prop in target || prop === 'parsedUrl' || prop === 'params' || prop === 'query');
                        },
                    });
                    for (const handler of handlers) {
                        const result = await handler(routerRequest, context);
                        if (result) {
                            return result;
                        }
                    }
                }
            }
        }
    }
    return new Proxy({}, {
        get(_, prop) {
            if (prop === 'handle') {
                return handleRequest;
            }
            const method = prop.toString().toLowerCase();
            return function routeMethodKeyFn(path, ...handlers) {
                if (method === 'all') {
                    for (const httpMethod of HTTP_METHODS) {
                        addHandlersToMethod(httpMethod, path, ...handlers);
                    }
                }
                else {
                    addHandlersToMethod(method.toUpperCase(), path, ...handlers);
                }
                return this;
            };
        },
    });
}
function createRouter(options) {
    const routerBaseObject = createRouterBase(options);
    return createServerAdapter(routerBaseObject, options);
}

export { createRouter, createRouterBase };