initial commit (app returns google/startpage results)
This commit is contained in:
odweta
+676
@@ -0,0 +1,676 @@
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'use strict'
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const {
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safeHTTPMethods,
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pathHasQueryOrFragment,
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hasSafeIterator,
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isValidHTTPToken
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} = require('../core/util')
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const { serializePathWithQuery } = require('../core/util')
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const MAX_DELTA_SECONDS = 2147483647
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const RESTRICTIVE_DIRECTIVE_NAMES = ['no-store', 'private', 'no-cache']
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const kInvalidCacheControlDirectives = Symbol('invalid cache-control directives')
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function trimOWS (value) {
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return value.replace(/^[\t ]+|[\t ]+$/g, '')
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}
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function arrayIncludes (array, value) {
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for (let i = 0; i < array.length; i++) {
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if (array[i] === value) {
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return true
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}
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}
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return false
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}
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function trimOWSStart (value) {
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return value.replace(/^[\t ]+/, '')
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}
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function trimOWSEnd (value) {
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return value.replace(/[\t ]+$/, '')
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}
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function findUnescapedQuote (value, start) {
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let escaped = false
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for (let i = start; i < value.length; i++) {
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if (escaped) {
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escaped = false
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} else if (value[i] === '\\') {
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escaped = true
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} else if (value[i] === '"') {
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return i
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}
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}
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return -1
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}
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function splitCacheControlHeaderValue (value) {
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const directives = []
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let start = 0
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let quoteStart = -1
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let inQuote = false
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let escaped = false
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for (let i = 0; i < value.length; i++) {
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if (inQuote) {
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if (escaped) {
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escaped = false
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} else if (value[i] === '\\') {
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escaped = true
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} else if (value[i] === '"') {
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inQuote = false
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quoteStart = -1
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}
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} else if (value[i] === '"') {
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inQuote = true
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quoteStart = i
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} else if (value[i] === ',') {
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directives.push({ value: value.substring(start, i), fromMalformedQuote: false })
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start = i + 1
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}
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}
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if (!inQuote) {
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directives.push({ value: value.substring(start), fromMalformedQuote: false })
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return directives
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}
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const tail = value.substring(start)
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const quoteOffset = quoteStart - start
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let tailStart = 0
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for (let i = 0; i < tail.length; i++) {
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if (tail[i] === ',') {
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directives.push({
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value: tail.substring(tailStart, i),
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fromMalformedQuote: tailStart > quoteOffset
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})
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tailStart = i + 1
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}
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}
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directives.push({
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value: tail.substring(tailStart),
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fromMalformedQuote: tailStart > quoteOffset
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})
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return directives
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}
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function markInvalidCacheControlDirective (directives, key) {
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let invalidDirectives = directives[kInvalidCacheControlDirectives]
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if (invalidDirectives === undefined) {
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invalidDirectives = new Set()
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Object.defineProperty(directives, kInvalidCacheControlDirectives, {
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value: invalidDirectives
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})
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}
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invalidDirectives.add(key)
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}
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function hasInvalidCacheControlDirective (directives, key) {
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return directives[kInvalidCacheControlDirectives]?.has(key) === true
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}
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function getMalformedRestrictiveDirectiveName (key) {
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for (const directiveName of RESTRICTIVE_DIRECTIVE_NAMES) {
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if (
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key.startsWith(directiveName) &&
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key.length > directiveName.length &&
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!isValidHTTPToken(key[directiveName.length])
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) {
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return directiveName
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}
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}
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let tokenOnlyKey = ''
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let hasInvalidTokenChar = false
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for (let i = 0; i < key.length; i++) {
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if (isValidHTTPToken(key[i])) {
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tokenOnlyKey += key[i]
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} else {
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hasInvalidTokenChar = true
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}
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}
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if (hasInvalidTokenChar && arrayIncludes(RESTRICTIVE_DIRECTIVE_NAMES, tokenOnlyKey)) {
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return tokenOnlyKey
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}
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}
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/**
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* @param {import('../../types/dispatcher.d.ts').default.DispatchOptions} opts
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*/
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function makeCacheKey (opts) {
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if (!opts.origin) {
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throw new Error('opts.origin is undefined')
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}
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let fullPath = opts.path || '/'
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if (opts.query && !pathHasQueryOrFragment(fullPath)) {
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fullPath = serializePathWithQuery(fullPath, opts.query)
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}
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return {
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origin: opts.origin.toString(),
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method: opts.method,
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path: fullPath,
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headers: opts.headers
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}
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}
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function appendHeader (headers, key, val) {
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const headerName = key.toLowerCase()
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const current = headers[headerName]
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const values = Array.isArray(val) ? val : [val]
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if (current === undefined) {
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headers[headerName] = Array.isArray(val) ? val.slice() : val
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} else if (Array.isArray(current)) {
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current.push(...values)
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} else {
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headers[headerName] = [current, ...values]
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}
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}
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/**
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* @param {Record<string, string[] | string>}
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* @returns {Record<string, string[] | string>}
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*/
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function normalizeHeaders (opts) {
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let headers
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if (opts.headers == null) {
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headers = {}
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} else if (typeof opts.headers === 'object') {
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headers = {}
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if (hasSafeIterator(opts.headers)) {
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for (const x of opts.headers) {
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if (!Array.isArray(x)) {
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throw new Error('opts.headers is not a valid header map')
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}
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const [key, val] = x
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if (typeof key !== 'string' || typeof val !== 'string') {
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throw new Error('opts.headers is not a valid header map')
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}
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appendHeader(headers, key, val)
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}
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} else {
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for (const key of Object.keys(opts.headers)) {
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appendHeader(headers, key, opts.headers[key])
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}
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}
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} else {
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throw new Error('opts.headers is not an object')
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}
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return headers
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}
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/**
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* @param {any} key
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*/
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function assertCacheKey (key) {
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if (typeof key !== 'object') {
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throw new TypeError(`expected key to be object, got ${typeof key}`)
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}
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for (const property of ['origin', 'method', 'path']) {
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if (typeof key[property] !== 'string') {
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throw new TypeError(`expected key.${property} to be string, got ${typeof key[property]}`)
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}
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}
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if (key.headers !== undefined && typeof key.headers !== 'object') {
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throw new TypeError(`expected headers to be object, got ${typeof key}`)
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}
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}
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/**
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* @param {any} value
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*/
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function assertCacheValue (value) {
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if (typeof value !== 'object') {
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throw new TypeError(`expected value to be object, got ${typeof value}`)
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}
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for (const property of ['statusCode', 'cachedAt', 'staleAt', 'deleteAt']) {
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if (typeof value[property] !== 'number') {
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throw new TypeError(`expected value.${property} to be number, got ${typeof value[property]}`)
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}
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}
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if (typeof value.statusMessage !== 'string') {
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throw new TypeError(`expected value.statusMessage to be string, got ${typeof value.statusMessage}`)
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}
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if (value.headers != null && typeof value.headers !== 'object') {
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throw new TypeError(`expected value.rawHeaders to be object, got ${typeof value.headers}`)
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}
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if (value.vary !== undefined && typeof value.vary !== 'object') {
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throw new TypeError(`expected value.vary to be object, got ${typeof value.vary}`)
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}
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if (value.etag !== undefined && typeof value.etag !== 'string') {
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throw new TypeError(`expected value.etag to be string, got ${typeof value.etag}`)
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}
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}
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/**
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* @see https://www.rfc-editor.org/rfc/rfc9111.html#name-cache-control
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* @see https://www.iana.org/assignments/http-cache-directives/http-cache-directives.xhtml
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* @param {string | string[]} header
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* @returns {import('../../types/cache-interceptor.d.ts').default.CacheControlDirectives}
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*/
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function parseCacheControlHeader (header) {
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/**
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* @type {import('../../types/cache-interceptor.d.ts').default.CacheControlDirectives}
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*/
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const output = {}
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const invalidNumericDirectives = new Set()
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const invalidNoArgumentDirectives = new Set()
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const directives = splitCacheControlHeaderValue(Array.isArray(header) ? header.join(',') : header)
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for (let i = 0; i < directives.length; i++) {
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const directiveRecord = directives[i]
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const directive = directiveRecord.value.toLowerCase()
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const fromMalformedQuote = directiveRecord.fromMalformedQuote
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const keyValueDelimiter = directive.indexOf('=')
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let key
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let value
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let keyHasTrailingWhitespace = false
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let valueHasLeadingWhitespace = false
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if (keyValueDelimiter !== -1) {
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const rawKey = directive.substring(0, keyValueDelimiter)
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const rawValue = directive.substring(keyValueDelimiter + 1)
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keyHasTrailingWhitespace = trimOWSEnd(rawKey) !== rawKey
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valueHasLeadingWhitespace = trimOWSStart(rawValue) !== rawValue
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key = trimOWS(rawKey)
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value = trimOWSStart(rawValue)
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} else {
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key = trimOWS(directive)
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}
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const malformedRestrictiveDirectiveName = getMalformedRestrictiveDirectiveName(key)
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if (malformedRestrictiveDirectiveName !== undefined) {
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output[malformedRestrictiveDirectiveName] = true
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continue
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}
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switch (key) {
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case 'min-fresh':
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case 'max-stale':
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case 'max-age':
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case 's-maxage':
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case 'stale-while-revalidate':
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case 'stale-if-error': {
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if (fromMalformedQuote || invalidNumericDirectives.has(key)) {
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continue
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}
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if (value === undefined || keyHasTrailingWhitespace || valueHasLeadingWhitespace) {
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delete output[key]
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invalidNumericDirectives.add(key)
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markInvalidCacheControlDirective(output, key)
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continue
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}
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|
||||
if (
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value.length >= 2 &&
|
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value[0] === '"' &&
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||||
value[value.length - 1] === '"'
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||||
) {
|
||||
value = value.substring(1, value.length - 1)
|
||||
}
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||||
|
||||
if (!/^[0-9]+$/.test(value)) {
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||||
delete output[key]
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||||
invalidNumericDirectives.add(key)
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||||
markInvalidCacheControlDirective(output, key)
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||||
continue
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||||
}
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const parsedValue = Math.min(parseInt(value, 10), MAX_DELTA_SECONDS)
|
||||
|
||||
if (key === 'min-fresh') {
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if (!(key in output) || output[key] < parsedValue) {
|
||||
output[key] = parsedValue
|
||||
}
|
||||
} else if (!(key in output) || output[key] > parsedValue) {
|
||||
output[key] = parsedValue
|
||||
}
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||||
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||||
break
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}
|
||||
case 'private':
|
||||
case 'no-cache': {
|
||||
if (fromMalformedQuote) {
|
||||
output[key] = true
|
||||
break
|
||||
}
|
||||
|
||||
if (value !== undefined && value.length === 0) {
|
||||
output[key] = true
|
||||
break
|
||||
}
|
||||
|
||||
if (value) {
|
||||
// The private and no-cache directives can be unqualified (aka just
|
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// `private` or `no-cache`) or qualified (w/ a value). When they're
|
||||
// qualified, it's a list of headers like `no-cache=header1`,
|
||||
// `no-cache="header1"`, or `no-cache="header1, header2"`
|
||||
// If we're given multiple headers, the comma messes us up since
|
||||
// we split the full header by commas. So, let's loop through the
|
||||
// remaining parts in front of us until we find one that contains a
|
||||
// closing quote. We can then skip the consumed quoted-list fragments and
|
||||
// continue parsing like normal.
|
||||
// https://www.rfc-editor.org/rfc/rfc9111.html#name-no-cache-2
|
||||
if (value[0] === '"') {
|
||||
// Something like `no-cache="some-header"` OR `no-cache="some-header, another-header"`.
|
||||
value = trimOWSEnd(value)
|
||||
|
||||
let fieldList = ''
|
||||
let lastQuotedPart = i
|
||||
let foundEndingQuote = false
|
||||
const closingQuote = findUnescapedQuote(value, 1)
|
||||
|
||||
if (closingQuote !== -1) {
|
||||
fieldList = value.substring(1, closingQuote)
|
||||
foundEndingQuote = true
|
||||
} else {
|
||||
// Something like `no-cache="some-header, another-header"`
|
||||
// This can still be something invalid, e.g. `no-cache="some-header, ...`
|
||||
const fieldListParts = [value.substring(1)]
|
||||
|
||||
for (let j = i + 1; j < directives.length; j++) {
|
||||
const nextPart = trimOWS(directives[j].value)
|
||||
const closingQuote = findUnescapedQuote(nextPart, 0)
|
||||
|
||||
lastQuotedPart = j
|
||||
|
||||
if (closingQuote !== -1) {
|
||||
fieldListParts.push(nextPart.substring(0, closingQuote))
|
||||
foundEndingQuote = true
|
||||
break
|
||||
}
|
||||
|
||||
fieldListParts.push(nextPart)
|
||||
}
|
||||
|
||||
fieldList = fieldListParts.join(',')
|
||||
}
|
||||
|
||||
if (!foundEndingQuote) {
|
||||
output[key] = true
|
||||
break
|
||||
}
|
||||
|
||||
i = lastQuotedPart
|
||||
|
||||
const headers = fieldList.split(',')
|
||||
let validFieldNames = true
|
||||
for (let j = 0; j < headers.length; j++) {
|
||||
headers[j] = trimOWS(headers[j])
|
||||
if (!isValidHTTPToken(headers[j])) {
|
||||
validFieldNames = false
|
||||
}
|
||||
}
|
||||
|
||||
if (!validFieldNames) {
|
||||
output[key] = true
|
||||
} else if (output[key] !== true) {
|
||||
if (key in output) {
|
||||
output[key] = output[key].concat(headers)
|
||||
} else {
|
||||
output[key] = headers
|
||||
}
|
||||
}
|
||||
} else {
|
||||
// Something like `no-cache=some-header`
|
||||
const fieldName = trimOWS(value)
|
||||
|
||||
if (!isValidHTTPToken(fieldName)) {
|
||||
output[key] = true
|
||||
} else if (output[key] !== true) {
|
||||
if (key in output) {
|
||||
output[key] = output[key].concat(fieldName)
|
||||
} else {
|
||||
output[key] = [fieldName]
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
break
|
||||
}
|
||||
}
|
||||
// eslint-disable-next-line no-fallthrough
|
||||
case 'public':
|
||||
case 'must-revalidate':
|
||||
case 'proxy-revalidate':
|
||||
case 'immutable':
|
||||
case 'no-transform':
|
||||
case 'must-understand':
|
||||
case 'only-if-cached':
|
||||
if (fromMalformedQuote || invalidNoArgumentDirectives.has(key)) {
|
||||
continue
|
||||
}
|
||||
|
||||
if (value !== undefined) {
|
||||
// These are qualified (something like `public=...`) when they aren't
|
||||
// allowed to be, skip all instances of the malformed directive.
|
||||
delete output[key]
|
||||
invalidNoArgumentDirectives.add(key)
|
||||
continue
|
||||
}
|
||||
|
||||
output[key] = true
|
||||
break
|
||||
case 'no-store':
|
||||
output[key] = true
|
||||
break
|
||||
default:
|
||||
// Ignore unknown directives as per https://www.rfc-editor.org/rfc/rfc9111.html#section-5.2.3-1
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
return output
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {string | string[]} varyHeader Vary header from the server
|
||||
* @returns {string[]}
|
||||
*/
|
||||
function splitVaryHeader (varyHeader) {
|
||||
const values = Array.isArray(varyHeader) ? varyHeader : [varyHeader]
|
||||
const output = []
|
||||
|
||||
for (let i = 0; i < values.length; i++) {
|
||||
const parts = values[i].split(',')
|
||||
for (let j = 0; j < parts.length; j++) {
|
||||
output.push(parts[j])
|
||||
}
|
||||
}
|
||||
|
||||
return output
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {string | string[]} varyHeader Vary header from the server
|
||||
* @returns {boolean}
|
||||
*/
|
||||
function hasVaryStar (varyHeader) {
|
||||
const values = splitVaryHeader(varyHeader)
|
||||
for (let i = 0; i < values.length; i++) {
|
||||
if (trimOWS(values[i]).indexOf('*') !== -1) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {string | string[]} varyHeader Vary header from the server
|
||||
* @param {Record<string, string | string[]>} headers Request headers
|
||||
* @returns {Record<string, string | string[] | null> | undefined}
|
||||
*/
|
||||
function parseVaryHeader (varyHeader, headers) {
|
||||
if (hasVaryStar(varyHeader)) {
|
||||
return headers
|
||||
}
|
||||
|
||||
const output = /** @type {Record<string, string | string[] | null>} */ ({})
|
||||
|
||||
const varyingHeaders = splitVaryHeader(varyHeader)
|
||||
|
||||
for (const header of varyingHeaders) {
|
||||
const trimmedHeader = trimOWS(header).toLowerCase()
|
||||
|
||||
if (trimmedHeader.length === 0) {
|
||||
continue
|
||||
}
|
||||
|
||||
if (!isValidHTTPToken(trimmedHeader)) {
|
||||
return undefined
|
||||
}
|
||||
|
||||
const headerValue = headers[trimmedHeader]
|
||||
output[trimmedHeader] = Array.isArray(headerValue) ? headerValue.slice() : headerValue ?? null
|
||||
}
|
||||
|
||||
return output
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {string | string[]} varyHeader Vary header from the server
|
||||
* @returns {boolean}
|
||||
*/
|
||||
function isInvalidOrWildcardVaryHeader (varyHeader) {
|
||||
return hasVaryStar(varyHeader) || parseVaryHeader(varyHeader, {}) === undefined
|
||||
}
|
||||
|
||||
/**
|
||||
* Note: this deviates from the spec a little. Empty etags ("", W/"") are valid,
|
||||
* however, including them in cached resposnes serves little to no purpose.
|
||||
*
|
||||
* @see https://www.rfc-editor.org/rfc/rfc9110.html#name-etag
|
||||
*
|
||||
* @param {string} etag
|
||||
* @returns {boolean}
|
||||
*/
|
||||
function isEtagUsable (etag) {
|
||||
if (etag.length <= 2) {
|
||||
// Shortest an etag can be is two chars (just ""). This is where we deviate
|
||||
// from the spec requiring a min of 3 chars however
|
||||
return false
|
||||
}
|
||||
|
||||
if (etag[0] === '"' && etag[etag.length - 1] === '"') {
|
||||
// ETag: ""asd123"" or ETag: "W/"asd123"", kinda undefined behavior in the
|
||||
// spec. Some servers will accept these while others don't.
|
||||
// ETag: "asd123"
|
||||
return !(etag[1] === '"' || etag.startsWith('"W/'))
|
||||
}
|
||||
|
||||
if (etag.startsWith('W/"') && etag[etag.length - 1] === '"') {
|
||||
// ETag: W/"", also where we deviate from the spec & require a min of 3
|
||||
// chars
|
||||
// ETag: for W/"", W/"asd123"
|
||||
return etag.length !== 4
|
||||
}
|
||||
|
||||
// Anything else
|
||||
return false
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {unknown} store
|
||||
* @returns {asserts store is import('../../types/cache-interceptor.d.ts').default.CacheStore}
|
||||
*/
|
||||
function assertCacheStore (store, name = 'CacheStore') {
|
||||
if (typeof store !== 'object' || store === null) {
|
||||
throw new TypeError(`expected type of ${name} to be a CacheStore, got ${store === null ? 'null' : typeof store}`)
|
||||
}
|
||||
|
||||
for (const fn of ['get', 'createWriteStream', 'delete']) {
|
||||
if (typeof store[fn] !== 'function') {
|
||||
throw new TypeError(`${name} needs to have a \`${fn}()\` function`)
|
||||
}
|
||||
}
|
||||
}
|
||||
/**
|
||||
* @param {unknown} methods
|
||||
* @returns {asserts methods is import('../../types/cache-interceptor.d.ts').default.CacheMethods[]}
|
||||
*/
|
||||
function assertCacheMethods (methods, name = 'CacheMethods') {
|
||||
if (!Array.isArray(methods)) {
|
||||
throw new TypeError(`expected type of ${name} needs to be an array, got ${methods === null ? 'null' : typeof methods}`)
|
||||
}
|
||||
|
||||
if (methods.length === 0) {
|
||||
throw new TypeError(`${name} needs to have at least one method`)
|
||||
}
|
||||
|
||||
for (const method of methods) {
|
||||
if (!arrayIncludes(safeHTTPMethods, method)) {
|
||||
throw new TypeError(`element of ${name}-array needs to be one of following values: ${safeHTTPMethods.join(', ')}, got ${method}`)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates a string key for request deduplication purposes.
|
||||
* This key is used to identify in-flight requests that can be shared.
|
||||
* @param {import('../../types/cache-interceptor.d.ts').default.CacheKey} cacheKey
|
||||
* @param {Set<string>} [excludeHeaders] Set of lowercase header names to exclude from the key
|
||||
* @returns {string}
|
||||
*/
|
||||
function makeDeduplicationKey (cacheKey, excludeHeaders) {
|
||||
// Use JSON.stringify to produce a collision-resistant key.
|
||||
// Previous format used `:` and `=` delimiters without escaping, which
|
||||
// allowed different header sets to produce identical keys (e.g.
|
||||
// {a:"x:b=y"} vs {a:"x", b:"y"}). See: https://github.com/nodejs/undici/issues/5012
|
||||
const headers = {}
|
||||
|
||||
if (cacheKey.headers) {
|
||||
const sortedHeaders = Object.keys(cacheKey.headers).sort()
|
||||
for (const header of sortedHeaders) {
|
||||
// Skip excluded headers
|
||||
if (excludeHeaders?.has(header.toLowerCase())) {
|
||||
continue
|
||||
}
|
||||
headers[header] = cacheKey.headers[header]
|
||||
}
|
||||
}
|
||||
|
||||
return JSON.stringify([cacheKey.origin, cacheKey.method, cacheKey.path, headers])
|
||||
}
|
||||
|
||||
module.exports = {
|
||||
makeCacheKey,
|
||||
normalizeHeaders,
|
||||
assertCacheKey,
|
||||
assertCacheValue,
|
||||
parseCacheControlHeader,
|
||||
hasInvalidCacheControlDirective,
|
||||
parseVaryHeader,
|
||||
hasVaryStar,
|
||||
isInvalidOrWildcardVaryHeader,
|
||||
isEtagUsable,
|
||||
assertCacheMethods,
|
||||
assertCacheStore,
|
||||
makeDeduplicationKey
|
||||
}
|
||||
Reference in New Issue
Block a user