main repo

node_modules/next/dist/esm/server/web/sandbox/context.js

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+import { AsyncLocalStorage } from "async_hooks";
+import { decorateServerError, getServerError } from "next/dist/compiled/@next/react-dev-overlay/dist/middleware";
+import { COMPILER_NAMES, EDGE_UNSUPPORTED_NODE_APIS } from "../../../shared/lib/constants";
+import { EdgeRuntime } from "next/dist/compiled/edge-runtime";
+import { readFileSync, promises as fs } from "fs";
+import { validateURL } from "../utils";
+import { pick } from "../../../lib/pick";
+import { fetchInlineAsset } from "./fetch-inline-assets";
+import { runInContext } from "vm";
+import BufferImplementation from "node:buffer";
+import EventsImplementation from "node:events";
+import AssertImplementation from "node:assert";
+import UtilImplementation from "node:util";
+import AsyncHooksImplementation from "node:async_hooks";
+/**
+ * A Map of cached module contexts indexed by the module name. It allows
+ * to have a different cache scoped per module name or depending on the
+ * provided module key on creation.
+ */ const moduleContexts = new Map();
+const pendingModuleCaches = new Map();
+/**
+ * For a given path a context, this function checks if there is any module
+ * context that contains the path with an older content and, if that's the
+ * case, removes the context from the cache.
+ */ export async function clearModuleContext(path) {
+    const handleContext = (key, cache, context)=>{
+        if (cache == null ? void 0 : cache.paths.has(path)) {
+            context.delete(key);
+        }
+    };
+    for (const [key, cache] of moduleContexts){
+        handleContext(key, cache, moduleContexts);
+    }
+    for (const [key, cache] of pendingModuleCaches){
+        handleContext(key, await cache, pendingModuleCaches);
+    }
+}
+async function loadWasm(wasm) {
+    const modules = {};
+    await Promise.all(wasm.map(async (binding)=>{
+        const module = await WebAssembly.compile(await fs.readFile(binding.filePath));
+        modules[binding.name] = module;
+    }));
+    return modules;
+}
+function buildEnvironmentVariablesFrom() {
+    const pairs = Object.keys(process.env).map((key)=>[
+            key,
+            process.env[key]
+        ]);
+    const env = Object.fromEntries(pairs);
+    env.NEXT_RUNTIME = "edge";
+    return env;
+}
+function throwUnsupportedAPIError(name) {
+    const error = new Error(`A Node.js API is used (${name}) which is not supported in the Edge Runtime.
+Learn more: https://nextjs.org/docs/api-reference/edge-runtime`);
+    decorateServerError(error, COMPILER_NAMES.edgeServer);
+    throw error;
+}
+function createProcessPolyfill() {
+    const processPolyfill = {
+        env: buildEnvironmentVariablesFrom()
+    };
+    const overridenValue = {};
+    for (const key of Object.keys(process)){
+        if (key === "env") continue;
+        Object.defineProperty(processPolyfill, key, {
+            get () {
+                if (overridenValue[key] !== undefined) {
+                    return overridenValue[key];
+                }
+                if (typeof process[key] === "function") {
+                    return ()=>throwUnsupportedAPIError(`process.${key}`);
+                }
+                return undefined;
+            },
+            set (value) {
+                overridenValue[key] = value;
+            },
+            enumerable: false
+        });
+    }
+    return processPolyfill;
+}
+function addStub(context, name) {
+    Object.defineProperty(context, name, {
+        get () {
+            return function() {
+                throwUnsupportedAPIError(name);
+            };
+        },
+        enumerable: false
+    });
+}
+function getDecorateUnhandledError(runtime) {
+    const EdgeRuntimeError = runtime.evaluate(`Error`);
+    return (error)=>{
+        if (error instanceof EdgeRuntimeError) {
+            decorateServerError(error, COMPILER_NAMES.edgeServer);
+        }
+    };
+}
+function getDecorateUnhandledRejection(runtime) {
+    const EdgeRuntimeError = runtime.evaluate(`Error`);
+    return (rejected)=>{
+        if (rejected.reason instanceof EdgeRuntimeError) {
+            decorateServerError(rejected.reason, COMPILER_NAMES.edgeServer);
+        }
+    };
+}
+const NativeModuleMap = (()=>{
+    const mods = {
+        "node:buffer": pick(BufferImplementation, [
+            "constants",
+            "kMaxLength",
+            "kStringMaxLength",
+            "Buffer",
+            "SlowBuffer"
+        ]),
+        "node:events": pick(EventsImplementation, [
+            "EventEmitter",
+            "captureRejectionSymbol",
+            "defaultMaxListeners",
+            "errorMonitor",
+            "listenerCount",
+            "on",
+            "once"
+        ]),
+        "node:async_hooks": pick(AsyncHooksImplementation, [
+            "AsyncLocalStorage",
+            "AsyncResource"
+        ]),
+        "node:assert": pick(AssertImplementation, [
+            "AssertionError",
+            "deepEqual",
+            "deepStrictEqual",
+            "doesNotMatch",
+            "doesNotReject",
+            "doesNotThrow",
+            "equal",
+            "fail",
+            "ifError",
+            "match",
+            "notDeepEqual",
+            "notDeepStrictEqual",
+            "notEqual",
+            "notStrictEqual",
+            "ok",
+            "rejects",
+            "strict",
+            "strictEqual",
+            "throws"
+        ]),
+        "node:util": pick(UtilImplementation, [
+            "_extend",
+            "callbackify",
+            "format",
+            "inherits",
+            "promisify",
+            "types"
+        ])
+    };
+    return new Map(Object.entries(mods));
+})();
+/**
+ * Create a module cache specific for the provided parameters. It includes
+ * a runtime context, require cache and paths cache.
+ */ async function createModuleContext(options) {
+    const warnedEvals = new Set();
+    const warnedWasmCodegens = new Set();
+    const wasm = await loadWasm(options.edgeFunctionEntry.wasm ?? []);
+    const runtime = new EdgeRuntime({
+        codeGeneration: process.env.NODE_ENV !== "production" ? {
+            strings: true,
+            wasm: true
+        } : undefined,
+        extend: (context)=>{
+            context.process = createProcessPolyfill();
+            Object.defineProperty(context, "require", {
+                enumerable: false,
+                value: (id)=>{
+                    const value = NativeModuleMap.get(id);
+                    if (!value) {
+                        throw TypeError("Native module not found: " + id);
+                    }
+                    return value;
+                }
+            });
+            context.__next_eval__ = function __next_eval__(fn) {
+                const key = fn.toString();
+                if (!warnedEvals.has(key)) {
+                    const warning = getServerError(new Error(`Dynamic Code Evaluation (e. g. 'eval', 'new Function') not allowed in Edge Runtime
+Learn More: https://nextjs.org/docs/messages/edge-dynamic-code-evaluation`), COMPILER_NAMES.edgeServer);
+                    warning.name = "DynamicCodeEvaluationWarning";
+                    Error.captureStackTrace(warning, __next_eval__);
+                    warnedEvals.add(key);
+                    options.onWarning(warning);
+                }
+                return fn();
+            };
+            context.__next_webassembly_compile__ = function __next_webassembly_compile__(fn) {
+                const key = fn.toString();
+                if (!warnedWasmCodegens.has(key)) {
+                    const warning = getServerError(new Error(`Dynamic WASM code generation (e. g. 'WebAssembly.compile') not allowed in Edge Runtime.
+Learn More: https://nextjs.org/docs/messages/edge-dynamic-code-evaluation`), COMPILER_NAMES.edgeServer);
+                    warning.name = "DynamicWasmCodeGenerationWarning";
+                    Error.captureStackTrace(warning, __next_webassembly_compile__);
+                    warnedWasmCodegens.add(key);
+                    options.onWarning(warning);
+                }
+                return fn();
+            };
+            context.__next_webassembly_instantiate__ = async function __next_webassembly_instantiate__(fn) {
+                const result = await fn();
+                // If a buffer is given, WebAssembly.instantiate returns an object
+                // containing both a module and an instance while it returns only an
+                // instance if a WASM module is given. Utilize the fact to determine
+                // if the WASM code generation happens.
+                //
+                // https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiate#primary_overload_%E2%80%94_taking_wasm_binary_code
+                const instantiatedFromBuffer = result.hasOwnProperty("module");
+                const key = fn.toString();
+                if (instantiatedFromBuffer && !warnedWasmCodegens.has(key)) {
+                    const warning = getServerError(new Error(`Dynamic WASM code generation ('WebAssembly.instantiate' with a buffer parameter) not allowed in Edge Runtime.
+Learn More: https://nextjs.org/docs/messages/edge-dynamic-code-evaluation`), COMPILER_NAMES.edgeServer);
+                    warning.name = "DynamicWasmCodeGenerationWarning";
+                    Error.captureStackTrace(warning, __next_webassembly_instantiate__);
+                    warnedWasmCodegens.add(key);
+                    options.onWarning(warning);
+                }
+                return result;
+            };
+            const __fetch = context.fetch;
+            context.fetch = async (input, init = {})=>{
+                var _init_headers_get;
+                const callingError = new Error("[internal]");
+                const assetResponse = await fetchInlineAsset({
+                    input,
+                    assets: options.edgeFunctionEntry.assets,
+                    distDir: options.distDir,
+                    context
+                });
+                if (assetResponse) {
+                    return assetResponse;
+                }
+                init.headers = new Headers(init.headers ?? {});
+                const prevs = ((_init_headers_get = init.headers.get(`x-middleware-subrequest`)) == null ? void 0 : _init_headers_get.split(":")) || [];
+                const value = prevs.concat(options.moduleName).join(":");
+                init.headers.set("x-middleware-subrequest", value);
+                if (!init.headers.has("user-agent")) {
+                    init.headers.set(`user-agent`, `Next.js Middleware`);
+                }
+                const response = typeof input === "object" && "url" in input ? __fetch(input.url, {
+                    ...pick(input, [
+                        "method",
+                        "body",
+                        "cache",
+                        "credentials",
+                        "integrity",
+                        "keepalive",
+                        "mode",
+                        "redirect",
+                        "referrer",
+                        "referrerPolicy",
+                        "signal"
+                    ]),
+                    ...init,
+                    headers: {
+                        ...Object.fromEntries(input.headers),
+                        ...Object.fromEntries(init.headers)
+                    }
+                }) : __fetch(String(input), init);
+                return await response.catch((err)=>{
+                    callingError.message = err.message;
+                    err.stack = callingError.stack;
+                    throw err;
+                });
+            };
+            const __Request = context.Request;
+            context.Request = class extends __Request {
+                constructor(input, init){
+                    const url = typeof input !== "string" && "url" in input ? input.url : String(input);
+                    validateURL(url);
+                    super(url, init);
+                    this.next = init == null ? void 0 : init.next;
+                }
+            };
+            const __redirect = context.Response.redirect.bind(context.Response);
+            context.Response.redirect = (...args)=>{
+                validateURL(args[0]);
+                return __redirect(...args);
+            };
+            for (const name of EDGE_UNSUPPORTED_NODE_APIS){
+                addStub(context, name);
+            }
+            Object.assign(context, wasm);
+            context.AsyncLocalStorage = AsyncLocalStorage;
+            return context;
+        }
+    });
+    const decorateUnhandledError = getDecorateUnhandledError(runtime);
+    runtime.context.addEventListener("error", decorateUnhandledError);
+    const decorateUnhandledRejection = getDecorateUnhandledRejection(runtime);
+    runtime.context.addEventListener("unhandledrejection", decorateUnhandledRejection);
+    return {
+        runtime,
+        paths: new Map(),
+        warnedEvals: new Set()
+    };
+}
+function getModuleContextShared(options) {
+    let deferredModuleContext = pendingModuleCaches.get(options.moduleName);
+    if (!deferredModuleContext) {
+        deferredModuleContext = createModuleContext(options);
+        pendingModuleCaches.set(options.moduleName, deferredModuleContext);
+    }
+    return deferredModuleContext;
+}
+/**
+ * For a given module name this function will get a cached module
+ * context or create it. It will return the module context along
+ * with a function that allows to run some code from a given
+ * filepath within the context.
+ */ export async function getModuleContext(options) {
+    let lazyModuleContext;
+    if (options.useCache) {
+        lazyModuleContext = moduleContexts.get(options.moduleName) || await getModuleContextShared(options);
+    }
+    if (!lazyModuleContext) {
+        lazyModuleContext = await createModuleContext(options);
+        moduleContexts.set(options.moduleName, lazyModuleContext);
+    }
+    const moduleContext = lazyModuleContext;
+    const evaluateInContext = (filepath)=>{
+        if (!moduleContext.paths.has(filepath)) {
+            const content = readFileSync(filepath, "utf-8");
+            try {
+                runInContext(content, moduleContext.runtime.context, {
+                    filename: filepath
+                });
+                moduleContext.paths.set(filepath, content);
+            } catch (error) {
+                if (options.useCache) {
+                    moduleContext == null ? void 0 : moduleContext.paths.delete(filepath);
+                }
+                throw error;
+            }
+        }
+    };
+    return {
+        ...moduleContext,
+        evaluateInContext
+    };
+}
+
+//# sourceMappingURL=context.js.map