including-modules

node_modules/next/dist/server/route-modules/app-route/helpers/auto-implement-methods.js

@@ -0,0 +1,85 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+Object.defineProperty(exports, "autoImplementMethods", {
+    enumerable: true,
+    get: function() {
+        return autoImplementMethods;
+    }
+});
+const _http = require("../../../web/http");
+const AUTOMATIC_ROUTE_METHODS = [
+    'HEAD',
+    'OPTIONS'
+];
+function handleMethodNotAllowedResponse() {
+    return new Response(null, {
+        status: 405
+    });
+}
+function autoImplementMethods(handlers) {
+    // Loop through all the HTTP methods to create the initial methods object.
+    // Each of the methods will be set to the 405 response handler.
+    const methods = _http.HTTP_METHODS.reduce((acc, method)=>({
+            ...acc,
+            // If the userland module implements the method, then use it. Otherwise,
+            // use the 405 response handler.
+            [method]: handlers[method] ?? handleMethodNotAllowedResponse
+        }), {});
+    // Get all the methods that could be automatically implemented that were not
+    // implemented by the userland module.
+    const implemented = new Set(_http.HTTP_METHODS.filter((method)=>handlers[method]));
+    const missing = AUTOMATIC_ROUTE_METHODS.filter((method)=>!implemented.has(method));
+    // Loop over the missing methods to automatically implement them if we can.
+    for (const method of missing){
+        // If the userland module doesn't implement the HEAD method, then
+        // we'll automatically implement it by calling the GET method (if it
+        // exists).
+        if (method === 'HEAD') {
+            if (handlers.GET) {
+                // Implement the HEAD method by calling the GET method.
+                methods.HEAD = handlers.GET;
+                // Mark it as implemented.
+                implemented.add('HEAD');
+            }
+            continue;
+        }
+        // If OPTIONS is not provided then implement it.
+        if (method === 'OPTIONS') {
+            // TODO: check if HEAD is implemented, if so, use it to add more headers
+            // Get all the methods that were implemented by the userland module.
+            const allow = [
+                'OPTIONS',
+                ...implemented
+            ];
+            // If the list of methods doesn't include HEAD, but it includes GET, then
+            // add HEAD as it's automatically implemented.
+            if (!implemented.has('HEAD') && implemented.has('GET')) {
+                allow.push('HEAD');
+            }
+            // Sort and join the list with commas to create the `Allow` header. See:
+            // https://httpwg.org/specs/rfc9110.html#field.allow
+            const headers = {
+                Allow: allow.sort().join(', ')
+            };
+            // Implement the OPTIONS method by returning a 204 response with the
+            // `Allow` header.
+            methods.OPTIONS = ()=>new Response(null, {
+                    status: 204,
+                    headers
+                });
+            // Mark this method as implemented.
+            implemented.add('OPTIONS');
+            continue;
+        }
+        throw Object.defineProperty(new Error(`Invariant: should handle all automatic implementable methods, got method: ${method}`), "__NEXT_ERROR_CODE", {
+            value: "E211",
+            enumerable: false,
+            configurable: true
+        });
+    }
+    return methods;
+}
+
+//# sourceMappingURL=auto-implement-methods.js.map