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{isBoolean, isNil, toString, castArray, toNumber, isString, padEnd} from \"lodash\";\nimport getArguments from \"function-arguments\";\nimport {APIConfig} from \"./APIConfig\";\nimport crypto from \"crypto\";\nimport slugify from \"slugify\";\nimport shortid from \"shortid\";\nimport {nanoid} from \"nanoid\";\nimport {encode, decode} from \"safe-base64\";\nimport isBuffer from \"lodash/isBuffer\";\n\nslugify.extend({\"/\": \":\"});\n\nexport type APIUtilsEncoding = BufferEncoding | \"urlsafe\";\n\nexport class APIUtils {\n\n static getRawTypeName(obj) {\n return Object.prototype.toString.call(obj).slice(8, -1);\n }\n\n static generateShortID() {\n return shortid.generate();\n }\n\n static generateLongID(length?: number) {\n return nanoid(length);\n }\n\n static slugify(text: string) {\n return slugify(text);\n }\n\n static convertToType(value: any, convertToType: string): any {\n\n if (isNil(convertToType)) {\n return value;\n }\n\n let convertedValue;\n let rawValueType = APIUtils.getRawTypeName(value);\n\n // No conversion needed\n if (rawValueType === convertToType) {\n return value;\n }\n\n // Objects and Arrays can only be converted to JSON strings\n if (rawValueType === \"Object\" || rawValueType === \"Array\") {\n if (convertToType === \"String\") {\n try {\n return JSON.stringify(value);\n } catch (e) {\n }\n }\n\n return undefined;\n }\n\n switch (convertToType) {\n case \"String\": {\n convertedValue = toString(value);\n break;\n }\n case \"Boolean\": {\n convertedValue = APIUtils.toBoolean(value);\n break;\n }\n case \"Number\": {\n convertedValue = toNumber(value);\n break;\n }\n case \"Array\": {\n convertedValue = castArray(value);\n break;\n }\n case \"Object\": {\n try {\n convertedValue = JSON.parse(value);\n } catch (e) {\n convertedValue = value;\n }\n }\n }\n\n return convertedValue;\n }\n\n static toBoolean(input: any) {\n if (isBoolean(input)) {\n return input;\n }\n\n return (/(1|true|yes)/i).test(input);\n }\n\n static coalesce(...inputArgs: any[]) {\n\n for (let inputArg of inputArgs) {\n\n // Consider an empty string as a null value\n if (isNil(inputArg) || (isString(inputArg) && inputArg === \"\")) {\n continue;\n }\n\n return inputArg;\n }\n\n return null;\n }\n\n static getFunctionParamNames(fn: Function): string[] {\n return getArguments(fn);\n }\n\n private static _IV_LENGTH = 16;\n private static _CRYPTO_ALG = 'aes-256-cbc';\n private static _HASH_ALG = 'sha256';\n\n static bufferToString(buffer: Buffer, encoding: APIUtilsEncoding): string {\n switch (encoding) {\n case \"urlsafe\": {\n return encode(buffer);\n }\n default: {\n return buffer.toString(encoding);\n }\n }\n }\n\n static stringToBuffer(theString: string, encoding: APIUtilsEncoding): Buffer {\n switch (encoding) {\n case \"urlsafe\": {\n return decode(theString);\n }\n default: {\n return Buffer.from(theString, encoding);\n }\n }\n }\n\n static encrypt(content: string | Buffer, password: string = APIConfig.ENCRYPTION_SECRET, encoding: APIUtilsEncoding = 'base64') {\n password = padEnd(password, 32, \"0\");\n\n let iv = crypto.randomBytes(this._IV_LENGTH);\n let cipher = crypto.createCipheriv(this._CRYPTO_ALG, Buffer.from(password), iv);\n let encrypted = cipher.update(content);\n\n const separator = encoding === \"urlsafe\" ? \"%3A\" : \":\";\n\n encrypted = Buffer.concat([encrypted, cipher.final()]);\n return APIUtils.bufferToString(iv, encoding) + separator + APIUtils.bufferToString(encrypted, encoding);\n }\n\n static decrypt(content: string | Buffer, password: string = APIConfig.ENCRYPTION_SECRET, encoding: APIUtilsEncoding = 'base64') {\n\n const separator = encoding === \"urlsafe\" ? \"%3A\" : \":\";\n\n if(isBuffer(content))\n {\n content = (content as Buffer).toString(\"utf8\");\n }\n\n let textParts = (content as string).split(separator);\n let iv = APIUtils.stringToBuffer(textParts.shift(), encoding);\n let encryptedText = APIUtils.stringToBuffer(textParts.join(separator), encoding);\n let decipher = crypto.createDecipheriv(this._CRYPTO_ALG, Buffer.from(password), iv);\n let decrypted = decipher.update(encryptedText);\n\n decrypted = Buffer.concat([decrypted, decipher.final()]);\n return decrypted.toString();\n }\n\n static hashString(text: string, encoding: APIUtilsEncoding = 'base64') {\n let shasum = crypto.createHash(this._HASH_ALG);\n shasum.update(text);\n return APIUtils.bufferToString(shasum.digest(), encoding);\n }\n\n static hashMD5(text: string, encoding: APIUtilsEncoding = 'base64') {\n let md5 = crypto.createHash('md5');\n md5.update(text);\n return APIUtils.bufferToString(md5.digest(), encoding);\n }\n\n /**\n * Creates an expiration date in seconds since UNIX epoch from now.\n * @param expirationInSeconds\n */\n static createExpirationInSeconds(expirationInSeconds: number): number {\n return Math.floor(Date.now() / 1000) + expirationInSeconds;\n }\n}"]} |