/**
 * ES256 key pair used for DPoP (Demonstrating Proof-of-Possession) operations.
 *
 * DPoP requires an ES256 (ECDSA using P-256 and SHA-256) key pair to generate
 * cryptographic proofs that bind access tokens to the client's private key.
 * This prevents token theft and replay attacks.
 * Generate keys outside constructor for better performance
 *
 * @example Generating a key pair
 * ```typescript
 * import { generateKeyPair } from "oauth4webapi";
 *
 * const dpopKeyPair = await generateKeyPair("ES256");
 *
 * const auth0 = new Auth0Client({
 *   useDPoP: true,
 *   dpopKeyPair
 * });
 * ```
 *
 * @example Loading from environment variables
 * ```typescript
 * // Set in .env.local:
 * // AUTH0_DPOP_PUBLIC_KEY="-----BEGIN PUBLIC KEY-----..."
 * // AUTH0_DPOP_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----..."
 *
 * const auth0 = new Auth0Client({
 *   useDPoP: true
 *   // Keys will be loaded automatically from environment
 * });
 * ```
 */
export interface DpopKeyPair {
    /** ES256 private key used to sign DPoP proofs */
    privateKey: CryptoKey;
    /** ES256 public key included in DPoP proofs for verification */
    publicKey: CryptoKey;
}
/**
 * Configuration options for DPoP (Demonstrating Proof-of-Possession) timing validation.
 *
 * These options configure how the SDK validates DPoP proof timing using oauth4webapi.
 * Proper timing configuration is crucial for security while allowing for reasonable
 * clock differences between client and server.
 *
 * @example Basic configuration
 * ```typescript
 * const auth0 = new Auth0Client({
 *   useDPoP: true,
 *   dpopOptions: {
 *     clockTolerance: 60, // Allow 60 seconds clock difference
 *     clockSkew: 0,       // No clock skew adjustment
 *     retry: {
 *       delay: 200,       // 200ms delay before retry
 *       jitter: true      // Add randomness to prevent thundering herd
 *     }
 *   }
 * });
 * ```
 *
 * @example Environment variable configuration
 * ```bash
 * # In .env.local
 * AUTH0_DPOP_CLOCK_SKEW=0
 * AUTH0_DPOP_CLOCK_TOLERANCE=30
 * AUTH0_RETRY_DELAY=100
 * AUTH0_RETRY_JITTER=true
 * ```
 */
export interface DpopOptions {
    /**
     * Clock skew adjustment in seconds. Use to adjust the assumed current time.
     *
     * - Positive values: Use when local clock is behind the server
     * - Negative values: Use when local clock is ahead of the server
     * - Zero (default): No adjustment needed
     *
     * Maps to oauth4webapi's clockSkew symbol.
     *
     * @default 0
     * @example
     * ```typescript
     * // If server time is 30 seconds ahead of client
     * dpopOptions: {
     *   clockSkew: 30  // Adjust client time forward by 30 seconds
     * }
     * ```
     */
    clockSkew?: number;
    /**
     * Clock tolerance in seconds for DateTime JWT claims validation.
     *
     * Allows for clock differences between client and server during DPoP proof validation.
     * Higher values are more permissive but may weaken security by allowing replay attacks
     * within a wider time window.
     *
     * Maps to oauth4webapi's clockTolerance symbol.
     *
     * @default 30
     *
     * @example Basic configuration
     * ```typescript
     * dpopOptions: {
     *   clockTolerance: 60  // Allow 60 seconds difference
     * }
     * ```
     *
     * @warning Values above 300 seconds may significantly weaken DPoP security
     */
    clockTolerance?: number;
    /**
     * Configuration for DPoP nonce error retry behavior.
     *
     * When a server responds with a DPoP nonce error, the SDK will retry the request
     * once with the new nonce. This configuration controls the retry timing.
     */
    retry?: RetryConfig;
}
/**
 * Configuration options for DPoP nonce error retry behavior.
 *
 * Since DPoP nonce errors are retried only once (to prevent infinite loops),
 * this configuration focuses on timing the single retry attempt for optimal
 * performance and server load distribution.
 *
 * @example Basic retry configuration
 * ```typescript
 * retry: {
 *   delay: 100,    // Wait 100ms before retry
 *   jitter: true   // Add randomness (50-100ms actual delay)
 * }
 * ```
 *
 * @example Disable jitter for predictable timing
 * ```typescript
 * retry: {
 *   delay: 200,    // Exactly 200ms delay
 *   jitter: false  // No randomness
 * }
 * ```
 */
export interface RetryConfig {
    /**
     * Delay in milliseconds before retrying on DPoP nonce error.
     *
     * A small delay helps prevent overwhelming the authorization server
     * with rapid retry attempts while keeping response times reasonable.
     *
     * @default 100
     * @example
     * ```typescript
     * retry: {
     *   delay: 250  // Wait 250ms before retry
     * }
     * ```
     */
    delay?: number;
    /**
     * Whether to add jitter (randomness) to retry delay to prevent thundering herd.
     *
     * When enabled, the actual delay will be 50-100% of the configured delay.
     * This helps distribute retry attempts over time when multiple clients
     * encounter nonce errors simultaneously.
     *
     * @default true
     * @example
     * ```typescript
     * retry: {
     *   delay: 100,
     *   jitter: true   // Actual delay: 50-100ms
     * }
     *
     * retry: {
     *   delay: 100,
     *   jitter: false  // Actual delay: exactly 100ms
     * }
     * ```
     */
    jitter?: boolean;
}