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/*
Router class to handle routing of requests based on the request path.
@param {Request} request - the incoming request object
@param {Environment} environment - the environment object
@param {Context} context - the context object
@returns {Response} a new Response object
*/
export default class Router {
constructor(request, environment, context) {
this.request = request;
this.environment = environment;
this.context = context;
this.routes = new Map(); // Use Map for faster lookups
this.parameters = {}; // Store extracted route parameters
}
/*
Add a new route to the router.
@param {string} path - the path to match
@param {function} handler - the handler function to call if the path matches
@returns {Router} the router object
*/
add(path, handler) {
if (typeof path !== "string") {
throw new TypeError("Path must be a string");
}
if (typeof handler !== "function") {
throw new TypeError("Handler must be a function");
}
const normalizedPath = path.replace(/\/+$/, ""); // Normalize path
const pathRegex = new RegExp(
"^" +
normalizedPath
.replace(/:[^/]+/g, "([^/]+)") // Convert :param to regex group
.replace(/\//g, "\\/") +
"$"
);
this.routes.set(pathRegex, { handler, originalPath: normalizedPath });
return this;
}
/*
Helper function to respond with a JSON object.
@param {object} body - the JSON object to respond with
@returns {Response} a new Response object
*/
respond(body, status = 200) {
return new Response(JSON.stringify(body), {
status,
headers: {
"Access-Control-Allow-Origin": "*",
"Content-Type": "application/json",
},
});
}
/*
Route the request to the appropriate handler based on the request path.
@returns {Response} a new Response object
*/
route() {
try {
const url = new URL(this.request.url);
const normalizedPath = url.pathname.replace(/\/+$/, ""); // Remove trailing slashes
for (const [pathRegex, { handler, originalPath }] of this.routes) {
const match = normalizedPath.match(pathRegex);
if (match) {
// Extract parameters
const paramNames = [...originalPath.matchAll(/:([^/]+)/g)].map(
(m) => m[1]
);
this.parameters = paramNames.reduce((params, name, index) => {
params[name] = match[index + 1];
return params;
}, {});
return handler(this.request, this.environment, this.context);
}
}
// Return 404 if route not found
return this.respond(
{
error: `Route not found: ${normalizedPath}`,
},
404
);
} catch (error) {
// Handle unexpected errors
return this.respond(
{
error: `Internal Server Error: ${error.message}`,
},
500
);
}
}
}
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