@solomonai/cache/dist/middleware.mjs.map

<div align="center"> <h1 align="center">@solomonai/cache</h1> <h5>Cache all the things</h5> </div>

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store, metrics });\n  }\n  return { wrap };\n}\n\nclass StoreWithMetrics<TNamespace extends string, TValue> implements Store<TNamespace, TValue> {\n  public name: string;\n  private readonly store: Store<TNamespace, TValue>;\n\n  private readonly metrics: Metrics;\n\n  constructor(opts: {\n    store: Store<TNamespace, TValue>;\n    metrics: Metrics;\n  }) {\n    this.name = opts.store.name;\n    this.store = opts.store;\n    this.metrics = opts.metrics;\n  }\n\n  public async get(\n    namespace: TNamespace,\n    key: string,\n  ): Promise<Result<Entry<TValue> | undefined, CacheError>> {\n    const start = performance.now();\n    const res = await this.store.get(namespace, key);\n\n    const now = Date.now();\n\n    this.metrics.emit({\n      metric: \"metric.cache.read\",\n      hit: typeof res.val !== \"undefined\",\n      status: res.val\n        ? now <= res.val.freshUntil\n          ? \"fresh\"\n          : now <= res.val.staleUntil\n            ? \"stale\"\n            : 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string {\n    return [key, this.encryptionKeyHash].join(\"/\");\n  }\n\n  public async get(\n    namespace: TNamespace,\n    key: string,\n  ): Promise<Result<Entry<TValue> | undefined, CacheError>> {\n    const res = await this.store.get(namespace, this.buildCacheKey(key));\n\n    if (res.err) {\n      return res;\n    }\n    if (!res.val) {\n      return res;\n    }\n    try {\n      const { iv, ciphertext } = res.val.value as { iv: string; ciphertext: string };\n      const decrypted = await this.decrypt(iv, ciphertext);\n\n      res.val.value = SuperJSON.parse(decrypted);\n    } catch (e) {\n      return Err(new CacheError({ tier: this.name, key, message: (e as Error).message }));\n    }\n\n    return res;\n  }\n\n  public async set(\n    namespace: TNamespace,\n    key: string,\n    value: Entry<TValue>,\n  ): Promise<Result<void, CacheError>> {\n    const { iv, ciphertext } = await this.encrypt(SuperJSON.stringify(value.value));\n    // @ts-expect-error\n    value.value = { iv, ciphertext };\n\n    const res = await this.store.set(namespace, this.buildCacheKey(key), value);\n\n    return res;\n  }\n\n  public async remove(namespace: TNamespace, key: string): Promise<Result<void, CacheError>> {\n    const res = this.store.remove(namespace, this.buildCacheKey(key));\n\n    return res;\n  }\n\n  private async encrypt(secret: string): Promise<{ iv: string; ciphertext: string }> {\n    const iv = crypto.getRandomValues(new Uint8Array(32));\n    const ciphertext = await crypto.subtle.encrypt(\n      {\n        name: \"AES-GCM\",\n        iv,\n      },\n      this.encryptionKey,\n      new TextEncoder().encode(secret),\n    );\n    return { iv: encode(iv), ciphertext: encode(ciphertext) };\n  }\n\n  private async decrypt(iv: string, ciphertext: string): Promise<string> {\n    const decryptedBuffer = await crypto.subtle.decrypt(\n      {\n        name: \"AES-GCM\",\n        iv: decode(iv),\n      },\n      this.encryptionKey,\n      decode(ciphertext),\n    );\n\n    return new TextDecoder().decode(decryptedBuffer);\n  }\n\n  static async fromBase64Key<TNamespace extends string, TValue>(\n    base64EncodedKey: string,\n  ): Promise<{ wrap: (store: Store<TNamespace, TValue>) => Store<TNamespace, TValue> }> {\n    const cryptoKey = await crypto.subtle.importKey(\n      \"raw\",\n      decode(base64EncodedKey),\n      { name: \"AES-GCM\", length: 256 },\n      false,\n      [\"encrypt\", \"decrypt\"],\n    );\n\n    const hash = encode(await crypto.subtle.digest(\"SHA-256\", decode(base64EncodedKey)));\n\n    return {\n      wrap: (store) =>\n        new EncryptedStore({ store, encryptionKey: cryptoKey, encryptionKeyHash: hash }),\n    };\n  }\n}\n\nconst base64abc = [\n  \"A\",\n  \"B\",\n  \"C\",\n  \"D\",\n  \"E\",\n  \"F\",\n  \"G\",\n  \"H\",\n  \"I\",\n  \"J\",\n  \"K\",\n  \"L\",\n  \"M\",\n  \"N\",\n  \"O\",\n  \"P\",\n  \"Q\",\n  \"R\",\n  \"S\",\n  \"T\",\n  \"U\",\n  \"V\",\n  \"W\",\n  \"X\",\n  \"Y\",\n  \"Z\",\n  \"a\",\n  \"b\",\n  \"c\",\n  \"d\",\n  \"e\",\n  \"f\",\n  \"g\",\n  \"h\",\n  \"i\",\n  \"j\",\n  \"k\",\n  \"l\",\n  \"m\",\n  \"n\",\n  \"o\",\n  \"p\",\n  \"q\",\n  \"r\",\n  \"s\",\n  \"t\",\n  \"u\",\n  \"v\",\n  \"w\",\n  \"x\",\n  \"y\",\n  \"z\",\n  \"0\",\n  \"1\",\n  \"2\",\n  \"3\",\n  \"4\",\n  \"5\",\n  \"6\",\n  \"7\",\n  \"8\",\n  \"9\",\n  \"+\",\n  \"/\",\n];\n\n/**\n * CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727\n * Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation\n * @param data\n */\nfunction encode(data: ArrayBuffer | string): string {\n  const uint8 =\n    typeof data === \"string\"\n      ? new TextEncoder().encode(data)\n      : data instanceof Uint8Array\n        ? data\n        : new Uint8Array(data);\n  let result = \"\";\n  let i: number;\n  const l = uint8.length;\n  for (i = 2; i < l; i += 3) {\n    result += base64abc[uint8[i - 2] >> 2];\n    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];\n    result += base64abc[((uint8[i - 1] & 0x0f) << 2) | (uint8[i] >> 6)];\n    result += base64abc[uint8[i] & 0x3f];\n  }\n  if (i === l + 1) {\n    // 1 octet yet to write\n    result += base64abc[uint8[i - 2] >> 2];\n    result += base64abc[(uint8[i - 2] & 0x03) << 4];\n    result += \"==\";\n  }\n  if (i === l) {\n    // 2 octets yet to write\n    result += base64abc[uint8[i - 2] >> 2];\n    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];\n    result += base64abc[(uint8[i - 1] & 0x0f) << 2];\n    result += \"=\";\n  }\n  return result.replaceAll(\"+\", \"-\").replaceAll(\"/\", \"_\").replaceAll(\"=\", \"\");\n}\n\n/**\n * Decodes a given RFC4648 base64 encoded string\n * @param b64\n */\nfunction decode(b64: string): Uint8Array {\n  const paddedLength = b64.length + ((4 - (b64.length % 4)) % 4);\n  const binString = atob(b64.replaceAll(\"-\", \"+\").replaceAll(\"_\", \"/\").padEnd(paddedLength, \"=\"));\n  const size = binString.length;\n  const bytes = new Uint8Array(size);\n  for (let i = 0; i < size; i++) {\n    bytes[i] = binString.charCodeAt(i);\n  }\n  return bytes;\n}\n\nexport async function withEncryption<TNamespace extends string, TValue = any>(\n  base64Key: string,\n): Promise<StoreMiddleware<TNamespace, TValue>> {\n  return await EncryptedStore.fromBase64Key(base64Key);\n}\n"]}