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{ createHmac } from 'crypto';\n\nimport type {\n DecodedData,\n SignaturOptions,\n SignaturReturnError,\n UnknownRecord,\n} from './custom_typings.js';\n\nexport class SignaturError extends Error {\n public type: string;\n\n constructor(type: string, message: string) {\n super();\n\n this.name = 'SignaturError';\n this.message = message;\n this.type = type;\n }\n\n public toJSON(): SignaturReturnError {\n return {\n error: {\n type: this.type,\n message: this.message,\n },\n };\n }\n}\n\nfunction urlSafeBase64(s: string) {\n return s.replace(/\\+/gi, '-').replace(/\\//gi, '_').replace(/=/gi, '');\n}\n\nexport function signSync<T = UnknownRecord>(\n data: T,\n secret: string,\n options?: SignaturOptions\n) {\n const { separator = '.' }: SignaturOptions = options || {};\n\n if (null == data) {\n throw new TypeError(\n `Expected 'data' to be defined, but received '${JSON.stringify(data)}'`);\n }\n\n if ('string' !== typeof(secret) || !secret.length) {\n throw new TypeError(`Expected 'secret' to be defined, but received '${secret}'`);\n }\n\n const stringData = JSON.stringify({ data });\n const encoded = Buffer.from(stringData, 'utf8').toString('base64');\n const signature = createHmac('sha256', secret).update(stringData).digest('base64');\n\n return urlSafeBase64(`${encoded}${separator}${signature}`);\n}\n\nexport function unsignSync<T = UnknownRecord>(\n signature: string,\n secret: string,\n options?: SignaturOptions\n): T {\n const { separator = '.' } = options || {} as SignaturOptions;\n\n if ('string' !== typeof(signature) || !signature.length) {\n throw new TypeError(`Expected 'signature' to be defined, but received '${signature}'`);\n }\n\n if ('string' !== typeof(secret) || !secret.length) {\n throw new TypeError(`Expected 'secret' to be defined, but received '${secret}'`);\n }\n\n const [hash, enc] = signature.split(separator, 2);\n const decoded = Buffer.from(\n (hash + '==='.slice((hash.length + 3) % 4))\n .replace(/\\-/gi, '+')\n .replace(/_/gi, '/'), 'base64')\n .toString('utf8');\n const signedDecoded = urlSafeBase64(\n createHmac('sha256', secret).update(decoded).digest('base64'));\n\n if (enc !== signedDecoded) {\n throw new SignaturError('invalid_signature', 'Signature not match');\n }\n\n return (JSON.parse(decoded) as DecodedData<T>).data;\n}\n\nexport async function sign<T = UnknownRecord>(\n data: T,\n secret: string,\n options?: SignaturOptions\n) {\n return signSync<T>(data, secret, options);\n}\n\nexport async function unsign<T = UnknownRecord>(\n signature: string,\n secret: string,\n options?: SignaturOptions\n): Promise<T> {\n return unsignSync<T>(signature, secret, options);\n}\n"]} |