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All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\nimport * as Protocol from '../../../generated/protocol.js';\nimport type {RenderBlocking, SyntheticNetworkRequest} from '../types/TraceEvents.js';\n\n// Important: we purposefully treat `potentially_blocking` as\n// non-render-blocking here because:\n// 1. An async script can run on the main thread at any point, including before\n//    the page is loaded\n// 2. An async script will never block the parsing and rendering process of the\n//    browser.\n// 3. Therefore, from a developer's point of view, there is nothing more they\n//    can do if they've put `async` on, and within the context of Insights, we\n//    shouldn't report an async script as render blocking.\n// In the future we may want to consider suggesting the use of `defer` over\n// `async`, as it doesn't have this concern, but for now we'll allow `async`\n// and not report it as an issue.\nconst NON_RENDER_BLOCKING_VALUES = new Set<RenderBlocking>([\n  'non_blocking',\n  'dynamically_injected_non_blocking',\n  'potentially_blocking',\n]);\n\nexport function isSyntheticNetworkRequestEventRenderBlocking(event: SyntheticNetworkRequest): boolean {\n  return !NON_RENDER_BLOCKING_VALUES.has(event.args.data.renderBlocking);\n}\n\nconst HIGH_NETWORK_PRIORITIES = new Set<Protocol.Network.ResourcePriority>([\n  Protocol.Network.ResourcePriority.VeryHigh,\n  Protocol.Network.ResourcePriority.High,\n  Protocol.Network.ResourcePriority.Medium,\n]);\n\nexport function isSyntheticNetworkRequestHighPriority(event: SyntheticNetworkRequest): boolean {\n  return HIGH_NETWORK_PRIORITIES.has(event.args.data.priority);\n}\n\nexport interface CacheControl {\n  'max-age'?: number;\n  'no-cache'?: boolean;\n  'no-store'?: boolean;\n  'must-revalidate'?: boolean;\n  // eslint-disable-next-line @stylistic/quote-props\n  'private'?: boolean;\n}\n\nexport const CACHEABLE_STATUS_CODES = new Set([200, 203, 206]);\n\n/** @type {Set<LH.Crdp.Network.ResourceType>} */\nexport const STATIC_RESOURCE_TYPES = new Set([\n  Protocol.Network.ResourceType.Font,\n  Protocol.Network.ResourceType.Image,\n  Protocol.Network.ResourceType.Media,\n  Protocol.Network.ResourceType.Script,\n  Protocol.Network.ResourceType.Stylesheet,\n]);\n\nexport const NON_NETWORK_SCHEMES = [\n  'blob',        // @see https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL\n  'data',        // @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs\n  'intent',      // @see https://developer.chrome.com/docs/multidevice/android/intents/\n  'file',        // @see https://en.wikipedia.org/wiki/File_URI_scheme\n  'filesystem',  // @see https://developer.mozilla.org/en-US/docs/Web/API/FileSystem\n  'chrome-extension',\n];\n\n/**\n * Parses Cache-Control directives based on https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control\n * eg. 'no-cache, no-store, max-age=0, no-transform, private' will return\n * {no-cache: true, no-store: true, max-age: 0, no-transform: true, private: true}\n */\nexport function parseCacheControl(header: string|null): CacheControl|null {\n  if (!header) {\n    return null;\n  }\n\n  const directives = header.split(',').map(directive => directive.trim());\n  const cacheControlOptions: CacheControl = {};\n\n  for (const directive of directives) {\n    const [key, value] = directive.split('=').map(part => part.trim());\n\n    switch (key) {\n      case 'max-age': {\n        const maxAge = parseInt(value, 10);\n        if (!isNaN(maxAge)) {\n          cacheControlOptions['max-age'] = maxAge;\n        }\n        break;\n      }\n      case 'no-cache':\n        cacheControlOptions['no-cache'] = true;\n        break;\n      case 'no-store':\n        cacheControlOptions['no-store'] = true;\n        break;\n      case 'must-revalidate':\n        cacheControlOptions['must-revalidate'] = true;\n        break;\n      case 'private':\n        cacheControlOptions['private'] = true;\n        break;\n      default:\n        // Ignore unknown directives\n        break;\n    }\n  }\n\n  return cacheControlOptions;\n}\n\nconst SECURE_LOCALHOST_DOMAINS = ['localhost', '127.0.0.1'];\n\n/**\n * Is the host localhost-enough to satisfy the \"secure context\" definition\n * https://github.com/GoogleChrome/lighthouse/pull/11766#discussion_r582340683\n */\nexport function isSyntheticNetworkRequestLocalhost(event: SyntheticNetworkRequest): boolean {\n  try {\n    const hostname = new URL(event.args.data.url).hostname;\n    // Any hostname terminating in `.localhost` is considered to be local.\n    // https://w3c.github.io/webappsec-secure-contexts/#localhost\n    // This method doesn't consider IPs that resolve to loopback, IPv6 or other loopback edgecases\n    return SECURE_LOCALHOST_DOMAINS.includes(hostname) || hostname.endsWith('.localhost');\n  } catch {\n    return false;\n  }\n}\n"]}