@sgnl-ai/set-transmitter
Version:
HTTP transmission library for Security Event Tokens (SET) with CAEP/SSF support
1 lines • 22.4 kB
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interface TransmitOptions {\n authToken?: string;\n headers?: Record<string, string>;\n timeout?: number;\n retry?: RetryConfig;\n parseResponse?: boolean;\n validateStatus?: (status: number) => boolean;\n}\n\nexport interface RetryConfig {\n maxAttempts?: number;\n retryableStatuses?: number[];\n backoffMs?: number;\n maxBackoffMs?: number;\n backoffMultiplier?: number;\n}\n\nexport interface TransmitResult {\n status: 'success' | 'failed';\n statusCode: number;\n body: string | Record<string, unknown>;\n headers: Record<string, string>;\n error?: string;\n retryable?: boolean;\n}\n\nexport interface TransmitterConfig {\n defaultOptions?: TransmitOptions;\n}\n\nexport const DEFAULT_RETRY_CONFIG: Required<RetryConfig> = {\n maxAttempts: 3,\n retryableStatuses: [429, 502, 503, 504],\n backoffMs: 1000,\n maxBackoffMs: 10000,\n backoffMultiplier: 2,\n};\n\nexport const DEFAULT_OPTIONS: TransmitOptions = {\n timeout: 30000,\n parseResponse: true,\n validateStatus: (status) => status < 400,\n retry: DEFAULT_RETRY_CONFIG,\n};\n","export const EventTypes = {\n SESSION_REVOKED: 'https://schemas.openid.net/secevent/caep/event-type/session-revoked',\n TOKEN_CLAIMS_CHANGE: 'https://schemas.openid.net/secevent/caep/event-type/token-claims-change',\n CREDENTIAL_CHANGE: 'https://schemas.openid.net/secevent/caep/event-type/credential-change',\n ASSURANCE_LEVEL_CHANGE:\n 'https://schemas.openid.net/secevent/caep/event-type/assurance-level-change',\n DEVICE_COMPLIANCE_CHANGE:\n 'https://schemas.openid.net/secevent/caep/event-type/device-compliance-change',\n} as const;\n\nexport type EventType = (typeof EventTypes)[keyof typeof EventTypes];\n\nexport const CONTENT_TYPE_SET = 'application/secevent+jwt';\nexport const CONTENT_TYPE_JSON = 'application/json';\nexport const DEFAULT_USER_AGENT = 'SGNL-Action-Framework/1.0';\n","export class TransmissionError extends Error {\n constructor(\n message: string,\n public readonly statusCode?: number,\n public readonly retryable: boolean = false,\n public readonly responseBody?: string,\n public readonly responseHeaders?: Record<string, string>,\n ) {\n super(message);\n this.name = 'TransmissionError';\n Object.setPrototypeOf(this, TransmissionError.prototype);\n }\n}\n\nexport class TimeoutError extends TransmissionError {\n constructor(message: string, timeout: number) {\n super(`${message} (timeout: ${timeout}ms)`, undefined, true);\n this.name = 'TimeoutError';\n Object.setPrototypeOf(this, TimeoutError.prototype);\n }\n}\n\nexport class NetworkError extends TransmissionError {\n public cause?: Error;\n\n constructor(message: string, cause?: Error) {\n super(message, undefined, true);\n this.name = 'NetworkError';\n if (cause) {\n this.cause = cause;\n }\n Object.setPrototypeOf(this, NetworkError.prototype);\n }\n}\n\nexport class ValidationError extends Error {\n constructor(message: string) {\n super(message);\n this.name = 'ValidationError';\n Object.setPrototypeOf(this, ValidationError.prototype);\n }\n}\n","import { RetryConfig } from './types';\n\nexport function calculateBackoff(\n attempt: number,\n config: Required<RetryConfig>,\n retryAfterMs?: number,\n): number {\n // If Retry-After header is present, use it\n if (retryAfterMs !== undefined && retryAfterMs > 0) {\n return Math.min(retryAfterMs, config.maxBackoffMs);\n }\n\n // Calculate exponential backoff with jitter\n const exponentialDelay = config.backoffMs * Math.pow(config.backoffMultiplier, attempt - 1);\n const clampedDelay = Math.min(exponentialDelay, config.maxBackoffMs);\n\n // Add jitter (±25% randomization)\n const jitter = clampedDelay * 0.25;\n const minDelay = clampedDelay - jitter;\n const maxDelay = clampedDelay + jitter;\n\n return Math.floor(Math.random() * (maxDelay - minDelay) + minDelay);\n}\n\nexport function parseRetryAfter(retryAfterHeader: string | undefined): number | undefined {\n if (!retryAfterHeader) {\n return undefined;\n }\n\n // If it's a number, assume it's delay in seconds\n const delaySeconds = parseInt(retryAfterHeader, 10);\n if (!isNaN(delaySeconds)) {\n return delaySeconds * 1000;\n }\n\n // If it's a date, calculate the delay\n const retryDate = new Date(retryAfterHeader);\n if (!isNaN(retryDate.getTime())) {\n const delayMs = retryDate.getTime() - Date.now();\n return delayMs > 0 ? delayMs : undefined;\n }\n\n return undefined;\n}\n\nexport function isRetryableStatus(statusCode: number, retryableStatuses: number[]): boolean {\n return retryableStatuses.includes(statusCode);\n}\n\nexport function shouldRetry(\n statusCode: number | undefined,\n attempt: number,\n config: Required<RetryConfig>,\n): boolean {\n if (attempt >= config.maxAttempts) {\n return false;\n }\n\n if (statusCode === undefined) {\n // Network errors are retryable\n return true;\n }\n\n return isRetryableStatus(statusCode, config.retryableStatuses);\n}\n\nexport async function delay(ms: number): Promise<void> {\n return new Promise((resolve) => setTimeout(resolve, ms));\n}\n","export function isValidSET(jwt: string): boolean {\n if (typeof jwt !== 'string') {\n return false;\n }\n\n // Basic JWT format validation: header.payload.signature\n const parts = jwt.split('.');\n if (parts.length !== 3) {\n return false;\n }\n\n // Check that each part is base64url encoded\n const base64urlRegex = /^[A-Za-z0-9_-]+$/;\n return parts.every((part) => base64urlRegex.test(part));\n}\n\nexport function normalizeAuthToken(token?: string): string | undefined {\n if (!token) {\n return undefined;\n }\n\n // If token already starts with \"Bearer \", return as is\n if (token.startsWith('Bearer ')) {\n return token;\n }\n\n // Otherwise, add \"Bearer \" prefix\n return `Bearer ${token}`;\n}\n\nexport function mergeHeaders(\n defaultHeaders: Record<string, string>,\n customHeaders?: Record<string, string>,\n): Record<string, string> {\n return {\n ...defaultHeaders,\n ...customHeaders,\n };\n}\n\nexport function parseResponseHeaders(headers: Headers): Record<string, string> {\n const result: Record<string, string> = {};\n headers.forEach((value, key) => {\n result[key] = value;\n });\n return result;\n}\n\nexport async function parseResponseBody(\n response: Response,\n parseJson: boolean,\n): Promise<string | Record<string, unknown>> {\n const text = await response.text();\n\n if (!parseJson || !text) {\n return text;\n }\n\n // Try to parse as JSON if content-type indicates JSON\n const contentType = response.headers.get('content-type');\n if (contentType?.includes('application/json')) {\n try {\n return JSON.parse(text) as Record<string, unknown>;\n } catch {\n // If parsing fails, return as text\n return text;\n }\n }\n\n return text;\n}\n","import {\n TransmitOptions,\n TransmitResult,\n DEFAULT_OPTIONS,\n DEFAULT_RETRY_CONFIG,\n RetryConfig,\n} from './types';\nimport { CONTENT_TYPE_SET, CONTENT_TYPE_JSON, DEFAULT_USER_AGENT } from './constants';\nimport { TransmissionError, TimeoutError, NetworkError, ValidationError } from './errors';\nimport { calculateBackoff, parseRetryAfter, shouldRetry, delay } from './retry';\nimport {\n isValidSET,\n normalizeAuthToken,\n mergeHeaders,\n parseResponseHeaders,\n parseResponseBody,\n} from './utils';\n\nexport async function transmitSET(\n jwt: string,\n url: string,\n options: TransmitOptions = {},\n): Promise<TransmitResult> {\n // Validate JWT format\n if (!isValidSET(jwt)) {\n throw new ValidationError('Invalid SET format: JWT must be in format header.payload.signature');\n }\n\n // Validate URL\n let parsedUrl: URL;\n try {\n parsedUrl = new URL(url);\n } catch {\n throw new ValidationError(`Invalid URL: ${url}`);\n }\n\n // Merge options with defaults\n const mergedOptions = {\n authToken: options.authToken,\n headers: options.headers || {},\n timeout: options.timeout ?? DEFAULT_OPTIONS.timeout!,\n parseResponse: options.parseResponse ?? DEFAULT_OPTIONS.parseResponse!,\n validateStatus: options.validateStatus ?? DEFAULT_OPTIONS.validateStatus!,\n retry: {\n ...DEFAULT_RETRY_CONFIG,\n ...(options.retry || {}),\n } as Required<RetryConfig>,\n };\n\n // Prepare headers\n const baseHeaders: Record<string, string> = {\n 'Content-Type': CONTENT_TYPE_SET,\n Accept: CONTENT_TYPE_JSON,\n 'User-Agent': DEFAULT_USER_AGENT,\n };\n\n // Add authorization header if provided\n const authToken = normalizeAuthToken(mergedOptions.authToken);\n if (authToken) {\n baseHeaders['Authorization'] = authToken;\n }\n\n // Merge custom headers\n const headers = mergeHeaders(baseHeaders, mergedOptions.headers);\n\n // Attempt transmission with retry logic\n let lastError: Error | undefined;\n let lastResponse: Response | undefined;\n\n for (let attempt = 1; attempt <= mergedOptions.retry.maxAttempts; attempt++) {\n try {\n // Create abort controller for timeout\n const controller = new AbortController();\n const timeoutId = setTimeout(() => controller.abort(), mergedOptions.timeout);\n\n try {\n // Make the request\n const response = await fetch(parsedUrl.toString(), {\n method: 'POST',\n headers,\n body: jwt,\n signal: controller.signal,\n });\n\n clearTimeout(timeoutId);\n lastResponse = response;\n\n // Parse response\n const responseHeaders = parseResponseHeaders(response.headers);\n const responseBody = await parseResponseBody(response, mergedOptions.parseResponse);\n\n // Check if status is successful\n const isSuccess = mergedOptions.validateStatus(response.status);\n\n if (isSuccess) {\n return {\n status: 'success',\n statusCode: response.status,\n body: responseBody,\n headers: responseHeaders,\n };\n }\n\n // Check if we should retry\n const canRetry = shouldRetry(response.status, attempt, mergedOptions.retry);\n if (!canRetry) {\n return {\n status: 'failed',\n statusCode: response.status,\n body: responseBody,\n headers: responseHeaders,\n error: `HTTP ${response.status}: ${response.statusText}`,\n retryable: mergedOptions.retry.retryableStatuses.includes(response.status),\n };\n }\n\n // Calculate backoff delay\n const retryAfterMs = parseRetryAfter(responseHeaders['retry-after']);\n const backoffMs = calculateBackoff(attempt, mergedOptions.retry, retryAfterMs);\n\n // Wait before retrying\n await delay(backoffMs);\n } catch (error) {\n clearTimeout(timeoutId);\n\n if (error instanceof Error) {\n if (error.name === 'AbortError') {\n lastError = new TimeoutError('Request timed out', mergedOptions.timeout);\n } else {\n lastError = new NetworkError(`Network error: ${error.message}`, error);\n }\n } else {\n lastError = new NetworkError('Unknown network error');\n }\n\n // Check if we should retry network errors\n if (!shouldRetry(undefined, attempt, mergedOptions.retry)) {\n throw lastError;\n }\n\n // Calculate backoff delay\n const backoffMs = calculateBackoff(attempt, mergedOptions.retry);\n await delay(backoffMs);\n }\n } catch (error) {\n // Re-throw if it's not a retryable error\n if (error instanceof ValidationError) {\n throw error;\n }\n lastError = error instanceof Error ? error : new Error(String(error));\n }\n }\n\n // If we've exhausted all retries\n if (lastResponse) {\n const responseHeaders = parseResponseHeaders(lastResponse.headers);\n // Body may have already been consumed, so handle the error\n let responseBody: string | Record<string, unknown> = '';\n try {\n responseBody = await parseResponseBody(lastResponse, mergedOptions.parseResponse);\n } catch {\n // Body already consumed, use empty string\n responseBody = '';\n }\n\n return {\n status: 'failed',\n statusCode: lastResponse.status,\n body: responseBody,\n headers: responseHeaders,\n error: lastError?.message || `HTTP ${lastResponse.status}: ${lastResponse.statusText}`,\n retryable: true,\n };\n }\n\n // Network error after all retries\n throw (\n lastError ||\n new TransmissionError('Failed to transmit SET after all retry attempts', undefined, true)\n );\n}\n\nexport function createTransmitter(\n defaultOptions?: TransmitOptions,\n): (jwt: string, url: string, options?: TransmitOptions) => Promise<TransmitResult> {\n return (jwt: string, url: string, options?: TransmitOptions) => {\n const mergedOptions = {\n ...defaultOptions,\n ...options,\n headers: {\n ...(defaultOptions?.headers || {}),\n ...(options?.headers || {}),\n },\n retry: {\n ...(defaultOptions?.retry || {}),\n ...(options?.retry || {}),\n },\n };\n return transmitSET(jwt, url, mergedOptions);\n };\n}\n"]}