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middleware-plugin.ts
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middleware-plugin.ts
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import type {
AssetBinding,
EdgeMiddlewareMeta,
} from '../loaders/get-module-build-info'
import type { EdgeSSRMeta } from '../loaders/get-module-build-info'
import { getNamedMiddlewareRegex } from '../../../shared/lib/router/utils/route-regex'
import { getModuleBuildInfo } from '../loaders/get-module-build-info'
import { getSortedRoutes } from '../../../shared/lib/router/utils'
import { webpack, sources, webpack5 } from 'next/dist/compiled/webpack/webpack'
import {
EDGE_RUNTIME_WEBPACK,
EDGE_UNSUPPORTED_NODE_APIS,
MIDDLEWARE_BUILD_MANIFEST,
FLIGHT_MANIFEST,
MIDDLEWARE_MANIFEST,
MIDDLEWARE_REACT_LOADABLE_MANIFEST,
NEXT_CLIENT_SSR_ENTRY_SUFFIX,
} from '../../../shared/lib/constants'
export interface EdgeFunctionDefinition {
env: string[]
files: string[]
name: string
page: string
regexp: string
wasm?: AssetBinding[]
assets?: AssetBinding[]
}
export interface MiddlewareManifest {
version: 1
sortedMiddleware: string[]
middleware: { [page: string]: EdgeFunctionDefinition }
functions: { [page: string]: EdgeFunctionDefinition }
}
interface EntryMetadata {
edgeMiddleware?: EdgeMiddlewareMeta
edgeApiFunction?: EdgeMiddlewareMeta
edgeSSR?: EdgeSSRMeta
env: Set<string>
wasmBindings: Map<string, string>
assetBindings: Map<string, string>
}
const NAME = 'MiddlewarePlugin'
const middlewareManifest: MiddlewareManifest = {
sortedMiddleware: [],
middleware: {},
functions: {},
version: 1,
}
export default class MiddlewarePlugin {
dev: boolean
constructor({ dev }: { dev: boolean }) {
this.dev = dev
}
apply(compiler: webpack5.Compiler) {
compiler.hooks.compilation.tap(NAME, (compilation, params) => {
const { hooks } = params.normalModuleFactory
/**
* This is the static code analysis phase.
*/
const codeAnalyzer = getCodeAnalizer({
dev: this.dev,
compiler,
compilation,
})
hooks.parser.for('javascript/auto').tap(NAME, codeAnalyzer)
hooks.parser.for('javascript/dynamic').tap(NAME, codeAnalyzer)
hooks.parser.for('javascript/esm').tap(NAME, codeAnalyzer)
/**
* Extract all metadata for the entry points in a Map object.
*/
const metadataByEntry = new Map<string, EntryMetadata>()
compilation.hooks.afterOptimizeModules.tap(
NAME,
getExtractMetadata({
compilation,
compiler,
dev: this.dev,
metadataByEntry,
})
)
/**
* Emit the middleware manifest.
*/
compilation.hooks.processAssets.tap(
{
name: 'NextJsMiddlewareManifest',
stage: (webpack as any).Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
},
getCreateAssets({ compilation, metadataByEntry })
)
})
}
}
export async function handleWebpackExtenalForEdgeRuntime({
request,
context,
contextInfo,
getResolve,
}: {
request: string
context: string
contextInfo: any
getResolve: () => any
}) {
if (contextInfo.issuerLayer === 'middleware' && isNodeJsModule(request)) {
// allows user to provide and use their polyfills, as we do with buffer.
try {
await getResolve()(context, request)
} catch {
return `root globalThis.__import_unsupported('${request}')`
}
}
}
function getCodeAnalizer(params: {
dev: boolean
compiler: webpack5.Compiler
compilation: webpack5.Compilation
}) {
return (parser: webpack5.javascript.JavascriptParser) => {
const {
dev,
compiler: { webpack: wp },
compilation,
} = params
const { hooks } = parser
/**
* For an expression this will check the graph to ensure it is being used
* by exports. Then it will store in the module buildInfo a boolean to
* express that it contains dynamic code and, if it is available, the
* module path that is using it.
*/
const handleExpression = () => {
if (!isInMiddlewareLayer(parser)) {
return
}
wp.optimize.InnerGraph.onUsage(parser.state, (used = true) => {
const buildInfo = getModuleBuildInfo(parser.state.module)
if (buildInfo.usingIndirectEval === true || used === false) {
return
}
if (!buildInfo.usingIndirectEval || used === true) {
buildInfo.usingIndirectEval = used
return
}
buildInfo.usingIndirectEval = new Set([
...Array.from(buildInfo.usingIndirectEval),
...Array.from(used),
])
})
}
/**
* This expression handler allows to wrap a dynamic code expression with a
* function call where we can warn about dynamic code not being allowed
* but actually execute the expression.
*/
const handleWrapExpression = (expr: any) => {
if (!isInMiddlewareLayer(parser)) {
return
}
if (dev) {
const { ConstDependency } = wp.dependencies
const dep1 = new ConstDependency(
'__next_eval__(function() { return ',
expr.range[0]
)
dep1.loc = expr.loc
parser.state.module.addPresentationalDependency(dep1)
const dep2 = new ConstDependency('})', expr.range[1])
dep2.loc = expr.loc
parser.state.module.addPresentationalDependency(dep2)
}
handleExpression()
return true
}
/**
* This expression handler allows to wrap a WebAssembly.compile invocation with a
* function call where we can warn about WASM code generation not being allowed
* but actually execute the expression.
*/
const handleWrapWasmCompileExpression = (expr: any) => {
if (!isInMiddlewareLayer(parser)) {
return
}
if (dev) {
const { ConstDependency } = wp.dependencies
const dep1 = new ConstDependency(
'__next_webassembly_compile__(function() { return ',
expr.range[0]
)
dep1.loc = expr.loc
parser.state.module.addPresentationalDependency(dep1)
const dep2 = new ConstDependency('})', expr.range[1])
dep2.loc = expr.loc
parser.state.module.addPresentationalDependency(dep2)
}
handleExpression()
}
/**
* This expression handler allows to wrap a WebAssembly.instatiate invocation with a
* function call where we can warn about WASM code generation not being allowed
* but actually execute the expression.
*
* Note that we don't update `usingIndirectEval`, i.e. we don't abort a production build
* since we can't determine statically if the first parameter is a module (legit use) or
* a buffer (dynamic code generation).
*/
const handleWrapWasmInstantiateExpression = (expr: any) => {
if (!isInMiddlewareLayer(parser)) {
return
}
if (dev) {
const { ConstDependency } = wp.dependencies
const dep1 = new ConstDependency(
'__next_webassembly_instantiate__(function() { return ',
expr.range[0]
)
dep1.loc = expr.loc
parser.state.module.addPresentationalDependency(dep1)
const dep2 = new ConstDependency('})', expr.range[1])
dep2.loc = expr.loc
parser.state.module.addPresentationalDependency(dep2)
}
}
/**
* Declares an environment variable that is being used in this module
* through this static analysis.
*/
const addUsedEnvVar = (envVarName: string) => {
const buildInfo = getModuleBuildInfo(parser.state.module)
if (buildInfo.nextUsedEnvVars === undefined) {
buildInfo.nextUsedEnvVars = new Set()
}
buildInfo.nextUsedEnvVars.add(envVarName)
}
/**
* A handler for calls to `process.env` where we identify the name of the
* ENV variable being assigned and store it in the module info.
*/
const handleCallMemberChain = (_: unknown, members: string[]) => {
if (members.length >= 2 && members[0] === 'env') {
addUsedEnvVar(members[1])
if (!isInMiddlewareLayer(parser)) {
return true
}
}
}
/**
* A handler for calls to `new Response()` so we can fail if user is setting the response's body.
*/
const handleNewResponseExpression = (node: any) => {
const firstParameter = node?.arguments?.[0]
if (
isInMiddlewareFile(parser) &&
firstParameter &&
!isNullLiteral(firstParameter) &&
!isUndefinedIdentifier(firstParameter)
) {
const error = buildWebpackError({
message: `Middleware is returning a response body (line: ${node.loc.start.line}), which is not supported.
Learn more: https://nextjs.org/docs/messages/returning-response-body-in-middleware`,
compilation,
parser,
...node,
})
if (dev) {
compilation.warnings.push(error)
} else {
compilation.errors.push(error)
}
}
}
/**
* Handler to store original source location of static and dynamic imports into module's buildInfo.
*/
const handleImport = (node: any) => {
if (isInMiddlewareLayer(parser) && node.source?.value && node?.loc) {
const { module, source } = parser.state
const buildInfo = getModuleBuildInfo(module)
if (!buildInfo.importLocByPath) {
buildInfo.importLocByPath = new Map()
}
const importedModule = node.source.value?.toString()!
buildInfo.importLocByPath.set(importedModule, {
sourcePosition: {
...node.loc.start,
source: module.identifier(),
},
sourceContent: source.toString(),
})
if (!dev && isNodeJsModule(importedModule)) {
compilation.warnings.push(
buildWebpackError({
message: `A Node.js module is loaded ('${importedModule}' at line ${node.loc.start.line}) which is not supported in the Edge Runtime.
Learn More: https://nextjs.org/docs/messages/node-module-in-edge-runtime`,
compilation,
parser,
...node,
})
)
}
}
}
/**
* A noop handler to skip analyzing some cases.
* Order matters: for it to work, it must be registered first
*/
const skip = () => (isInMiddlewareLayer(parser) ? true : undefined)
for (const prefix of ['', 'global.']) {
hooks.expression.for(`${prefix}Function.prototype`).tap(NAME, skip)
hooks.expression.for(`${prefix}Function.bind`).tap(NAME, skip)
hooks.call.for(`${prefix}eval`).tap(NAME, handleWrapExpression)
hooks.call.for(`${prefix}Function`).tap(NAME, handleWrapExpression)
hooks.new.for(`${prefix}Function`).tap(NAME, handleWrapExpression)
hooks.expression.for(`${prefix}eval`).tap(NAME, handleExpression)
hooks.expression.for(`${prefix}Function`).tap(NAME, handleExpression)
hooks.call
.for(`${prefix}WebAssembly.compile`)
.tap(NAME, handleWrapWasmCompileExpression)
hooks.call
.for(`${prefix}WebAssembly.instantiate`)
.tap(NAME, handleWrapWasmInstantiateExpression)
}
hooks.new.for('Response').tap(NAME, handleNewResponseExpression)
hooks.new.for('NextResponse').tap(NAME, handleNewResponseExpression)
hooks.callMemberChain.for('process').tap(NAME, handleCallMemberChain)
hooks.expressionMemberChain.for('process').tap(NAME, handleCallMemberChain)
hooks.importCall.tap(NAME, handleImport)
hooks.import.tap(NAME, handleImport)
/**
* Support static analyzing environment variables through
* destructuring `process.env` or `process["env"]`:
*
* const { MY_ENV, "MY-ENV": myEnv } = process.env
* ^^^^^^ ^^^^^^
*/
hooks.declarator.tap(NAME, (declarator) => {
if (
declarator.init?.type === 'MemberExpression' &&
isProcessEnvMemberExpression(declarator.init) &&
declarator.id?.type === 'ObjectPattern'
) {
for (const property of declarator.id.properties) {
if (property.type === 'RestElement') continue
if (
property.key.type === 'Literal' &&
typeof property.key.value === 'string'
) {
addUsedEnvVar(property.key.value)
} else if (property.key.type === 'Identifier') {
addUsedEnvVar(property.key.name)
}
}
if (!isInMiddlewareLayer(parser)) {
return true
}
}
})
if (!dev) {
// do not issue compilation warning on dev: invoking code will provide details
registerUnsupportedApiHooks(parser, compilation)
}
}
}
function getExtractMetadata(params: {
compilation: webpack5.Compilation
compiler: webpack5.Compiler
dev: boolean
metadataByEntry: Map<string, EntryMetadata>
}) {
const { dev, compilation, metadataByEntry, compiler } = params
const { webpack: wp } = compiler
return () => {
metadataByEntry.clear()
for (const [entryName, entryData] of compilation.entries) {
if (entryData.options.runtime !== EDGE_RUNTIME_WEBPACK) {
// Only process edge runtime entries
continue
}
const { moduleGraph } = compilation
const entryModules = new Set<webpack5.Module>()
const addEntriesFromDependency = (dependency: any) => {
const module = moduleGraph.getModule(dependency)
if (module) {
entryModules.add(module)
}
}
entryData.dependencies.forEach(addEntriesFromDependency)
entryData.includeDependencies.forEach(addEntriesFromDependency)
const entryMetadata: EntryMetadata = {
env: new Set<string>(),
wasmBindings: new Map(),
assetBindings: new Map(),
}
for (const entryModule of entryModules) {
const buildInfo = getModuleBuildInfo(entryModule)
/**
* When building for production checks if the module is using `eval`
* and in such case produces a compilation error. The module has to
* be in use.
*/
if (
!dev &&
buildInfo.usingIndirectEval &&
isUsingIndirectEvalAndUsedByExports({
entryModule: entryModule,
moduleGraph: moduleGraph,
runtime: wp.util.runtime.getEntryRuntime(compilation, entryName),
usingIndirectEval: buildInfo.usingIndirectEval,
wp,
})
) {
const id = entryModule.identifier()
if (/node_modules[\\/]regenerator-runtime[\\/]runtime\.js/.test(id)) {
continue
}
compilation.errors.push(
buildWebpackError({
message: `Dynamic Code Evaluation (e. g. 'eval', 'new Function', 'WebAssembly.compile') not allowed in Edge Runtime ${
typeof buildInfo.usingIndirectEval !== 'boolean'
? `\nUsed by ${Array.from(buildInfo.usingIndirectEval).join(
', '
)}`
: ''
}`,
entryModule,
compilation,
})
)
}
/**
* The entry module has to be either a page or a middleware and hold
* the corresponding metadata.
*/
if (buildInfo?.nextEdgeSSR) {
entryMetadata.edgeSSR = buildInfo.nextEdgeSSR
} else if (buildInfo?.nextEdgeMiddleware) {
entryMetadata.edgeMiddleware = buildInfo.nextEdgeMiddleware
} else if (buildInfo?.nextEdgeApiFunction) {
entryMetadata.edgeApiFunction = buildInfo.nextEdgeApiFunction
}
/**
* If there are env vars found in the module, append them to the set
* of env vars for the entry.
*/
if (buildInfo?.nextUsedEnvVars !== undefined) {
for (const envName of buildInfo.nextUsedEnvVars) {
entryMetadata.env.add(envName)
}
}
/**
* If the module is a WASM module we read the binding information and
* append it to the entry wasm bindings.
*/
if (buildInfo?.nextWasmMiddlewareBinding) {
entryMetadata.wasmBindings.set(
buildInfo.nextWasmMiddlewareBinding.name,
buildInfo.nextWasmMiddlewareBinding.filePath
)
}
if (buildInfo?.nextAssetMiddlewareBinding) {
entryMetadata.assetBindings.set(
buildInfo.nextAssetMiddlewareBinding.name,
buildInfo.nextAssetMiddlewareBinding.filePath
)
}
/**
* Append to the list of modules to process outgoingConnections from
* the module that is being processed.
*/
for (const conn of moduleGraph.getOutgoingConnections(entryModule)) {
if (conn.module) {
entryModules.add(conn.module)
}
}
}
metadataByEntry.set(entryName, entryMetadata)
}
}
}
/**
* Checks the value of usingIndirectEval and when it is a set of modules it
* check if any of the modules is actually being used. If the value is
* simply truthy it will return true.
*/
function isUsingIndirectEvalAndUsedByExports(args: {
entryModule: webpack5.Module
moduleGraph: webpack5.ModuleGraph
runtime: any
usingIndirectEval: true | Set<string>
wp: typeof webpack5
}): boolean {
const { moduleGraph, runtime, entryModule, usingIndirectEval, wp } = args
if (typeof usingIndirectEval === 'boolean') {
return usingIndirectEval
}
const exportsInfo = moduleGraph.getExportsInfo(entryModule)
for (const exportName of usingIndirectEval) {
if (exportsInfo.getUsed(exportName, runtime) !== wp.UsageState.Unused) {
return true
}
}
return false
}
function getCreateAssets(params: {
compilation: webpack5.Compilation
metadataByEntry: Map<string, EntryMetadata>
}) {
const { compilation, metadataByEntry } = params
return (assets: any) => {
for (const entrypoint of compilation.entrypoints.values()) {
if (!entrypoint.name) {
continue
}
// There should always be metadata for the entrypoint.
const metadata = metadataByEntry.get(entrypoint.name)
const page =
metadata?.edgeMiddleware?.page ||
metadata?.edgeSSR?.page ||
metadata?.edgeApiFunction?.page
if (!page) {
continue
}
const { namedRegex } = getNamedMiddlewareRegex(page, {
catchAll: !metadata.edgeSSR && !metadata.edgeApiFunction,
})
const regexp = metadata?.edgeMiddleware?.matcherRegexp || namedRegex
const edgeFunctionDefinition: EdgeFunctionDefinition = {
env: Array.from(metadata.env),
files: getEntryFiles(entrypoint.getFiles(), metadata),
name: entrypoint.name,
page: page,
regexp,
wasm: Array.from(metadata.wasmBindings, ([name, filePath]) => ({
name,
filePath,
})),
assets: Array.from(metadata.assetBindings, ([name, filePath]) => ({
name,
filePath,
})),
}
if (metadata.edgeApiFunction || metadata.edgeSSR) {
middlewareManifest.functions[page] = edgeFunctionDefinition
} else {
middlewareManifest.middleware[page] = edgeFunctionDefinition
}
}
middlewareManifest.sortedMiddleware = getSortedRoutes(
Object.keys(middlewareManifest.middleware)
)
assets[MIDDLEWARE_MANIFEST] = new sources.RawSource(
JSON.stringify(middlewareManifest, null, 2)
)
}
}
function getEntryFiles(entryFiles: string[], meta: EntryMetadata) {
const files: string[] = []
if (meta.edgeSSR) {
if (meta.edgeSSR.isServerComponent) {
files.push(`server/${FLIGHT_MANIFEST}.js`)
files.push(
...entryFiles
.filter(
(file) =>
file.startsWith('pages/') && !file.endsWith('.hot-update.js')
)
.map(
(file) =>
'server/' +
file.replace('.js', NEXT_CLIENT_SSR_ENTRY_SUFFIX + '.js')
)
)
}
files.push(
`server/${MIDDLEWARE_BUILD_MANIFEST}.js`,
`server/${MIDDLEWARE_REACT_LOADABLE_MANIFEST}.js`
)
}
files.push(
...entryFiles
.filter((file) => !file.endsWith('.hot-update.js'))
.map((file) => 'server/' + file)
)
return files
}
function registerUnsupportedApiHooks(
parser: webpack5.javascript.JavascriptParser,
compilation: webpack5.Compilation
) {
for (const expression of EDGE_UNSUPPORTED_NODE_APIS) {
const warnForUnsupportedApi = (node: any) => {
if (!isInMiddlewareLayer(parser)) {
return
}
compilation.warnings.push(
buildUnsupportedApiError({
compilation,
parser,
apiName: expression,
...node,
})
)
return true
}
parser.hooks.call.for(expression).tap(NAME, warnForUnsupportedApi)
parser.hooks.expression.for(expression).tap(NAME, warnForUnsupportedApi)
parser.hooks.callMemberChain
.for(expression)
.tap(NAME, warnForUnsupportedApi)
parser.hooks.expressionMemberChain
.for(expression)
.tap(NAME, warnForUnsupportedApi)
}
const warnForUnsupportedProcessApi = (node: any, [callee]: string[]) => {
if (!isInMiddlewareLayer(parser) || callee === 'env') {
return
}
compilation.warnings.push(
buildUnsupportedApiError({
compilation,
parser,
apiName: `process.${callee}`,
...node,
})
)
return true
}
parser.hooks.callMemberChain
.for('process')
.tap(NAME, warnForUnsupportedProcessApi)
parser.hooks.expressionMemberChain
.for('process')
.tap(NAME, warnForUnsupportedProcessApi)
}
function buildUnsupportedApiError({
apiName,
loc,
...rest
}: {
apiName: string
loc: any
compilation: webpack5.Compilation
parser: webpack5.javascript.JavascriptParser
}) {
return buildWebpackError({
message: `A Node.js API is used (${apiName} at line: ${loc.start.line}) which is not supported in the Edge Runtime.
Learn more: https://nextjs.org/docs/api-reference/edge-runtime`,
loc,
...rest,
})
}
function buildWebpackError({
message,
loc,
compilation,
entryModule,
parser,
}: {
message: string
loc?: any
compilation: webpack5.Compilation
entryModule?: webpack5.Module
parser?: webpack5.javascript.JavascriptParser
}) {
const error = new compilation.compiler.webpack.WebpackError(message)
error.name = NAME
const module = entryModule ?? parser?.state.current
if (module) {
error.module = module
}
error.loc = loc
return error
}
function isInMiddlewareLayer(parser: webpack5.javascript.JavascriptParser) {
return parser.state.module?.layer === 'middleware'
}
function isInMiddlewareFile(parser: webpack5.javascript.JavascriptParser) {
return (
parser.state.current?.layer === 'middleware' &&
/middleware\.\w+$/.test(parser.state.current?.rawRequest)
)
}
function isNullLiteral(expr: any) {
return expr.value === null
}
function isUndefinedIdentifier(expr: any) {
return expr.name === 'undefined'
}
function isProcessEnvMemberExpression(memberExpression: any): boolean {
return (
memberExpression.object?.type === 'Identifier' &&
memberExpression.object.name === 'process' &&
((memberExpression.property?.type === 'Literal' &&
memberExpression.property.value === 'env') ||
(memberExpression.property?.type === 'Identifier' &&
memberExpression.property.name === 'env'))
)
}
function isNodeJsModule(moduleName: string) {
return require('module').builtinModules.includes(moduleName)
}