@payai/x402/dist/esm/facilitator/index.mjs.map

PayAI-distributed wrapper for @x402/core v2

{"version":3,"sources":["../../../src/facilitator/x402Facilitator.ts"],"sourcesContent":["import { x402Version } from \"..\";\nimport { SettleResponse, VerifyResponse } from \"../types/facilitator\";\nimport { FacilitatorExtension } from \"../types/extensions\";\nimport { SchemeNetworkFacilitator, FacilitatorContext } from \"../types/mechanisms\";\nimport { PaymentPayload, PaymentRequirements } from \"../types/payments\";\nimport { Network } from \"../types\";\nimport { type SchemeData } from \"../utils\";\n\n/**\n * Facilitator Hook Context Interfaces\n */\n\nexport interface FacilitatorVerifyContext {\n  paymentPayload: PaymentPayload;\n  requirements: PaymentRequirements;\n}\n\nexport interface FacilitatorVerifyResultContext extends FacilitatorVerifyContext {\n  result: VerifyResponse;\n}\n\nexport interface FacilitatorVerifyFailureContext extends FacilitatorVerifyContext {\n  error: Error;\n}\n\nexport interface FacilitatorSettleContext {\n  paymentPayload: PaymentPayload;\n  requirements: PaymentRequirements;\n}\n\nexport interface FacilitatorSettleResultContext extends FacilitatorSettleContext {\n  result: SettleResponse;\n}\n\nexport interface FacilitatorSettleFailureContext extends FacilitatorSettleContext {\n  error: Error;\n}\n\n/**\n * Facilitator Hook Type Definitions\n */\n\nexport type FacilitatorBeforeVerifyHook = (\n  context: FacilitatorVerifyContext,\n) => Promise<void | { abort: true; reason: string }>;\n\nexport type FacilitatorAfterVerifyHook = (context: FacilitatorVerifyResultContext) => Promise<void>;\n\nexport type FacilitatorOnVerifyFailureHook = (\n  context: FacilitatorVerifyFailureContext,\n) => Promise<void | { recovered: true; result: VerifyResponse }>;\n\nexport type FacilitatorBeforeSettleHook = (\n  context: FacilitatorSettleContext,\n) => Promise<void | { abort: true; reason: string }>;\n\nexport type FacilitatorAfterSettleHook = (context: FacilitatorSettleResultContext) => Promise<void>;\n\nexport type FacilitatorOnSettleFailureHook = (\n  context: FacilitatorSettleFailureContext,\n) => Promise<void | { recovered: true; result: SettleResponse }>;\n\n/**\n * Facilitator client for the x402 payment protocol.\n * Manages payment scheme registration, verification, and settlement.\n */\nexport class x402Facilitator {\n  private readonly registeredFacilitatorSchemes: Map<\n    number,\n    SchemeData<SchemeNetworkFacilitator>[] // Array to support multiple facilitators per version\n  > = new Map();\n  private readonly extensions: Map<string, FacilitatorExtension> = new Map();\n\n  private beforeVerifyHooks: FacilitatorBeforeVerifyHook[] = [];\n  private afterVerifyHooks: FacilitatorAfterVerifyHook[] = [];\n  private onVerifyFailureHooks: FacilitatorOnVerifyFailureHook[] = [];\n  private beforeSettleHooks: FacilitatorBeforeSettleHook[] = [];\n  private afterSettleHooks: FacilitatorAfterSettleHook[] = [];\n  private onSettleFailureHooks: FacilitatorOnSettleFailureHook[] = [];\n\n  /**\n   * Registers a scheme facilitator for the current x402 version.\n   * Networks are stored and used for getSupported() - no need to specify them later.\n   *\n   * @param networks - Single network or array of networks this facilitator supports\n   * @param facilitator - The scheme network facilitator to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  register(networks: Network | Network[], facilitator: SchemeNetworkFacilitator): x402Facilitator {\n    const networksArray = Array.isArray(networks) ? networks : [networks];\n    return this._registerScheme(x402Version, networksArray, facilitator);\n  }\n\n  /**\n   * Registers a scheme facilitator for x402 version 1.\n   * Networks are stored and used for getSupported() - no need to specify them later.\n   *\n   * @param networks - Single network or array of networks this facilitator supports\n   * @param facilitator - The scheme network facilitator to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  registerV1(\n    networks: Network | Network[],\n    facilitator: SchemeNetworkFacilitator,\n  ): x402Facilitator {\n    const networksArray = Array.isArray(networks) ? networks : [networks];\n    return this._registerScheme(1, networksArray, facilitator);\n  }\n\n  /**\n   * Registers a protocol extension.\n   *\n   * @param extension - The extension object to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  registerExtension(extension: FacilitatorExtension): x402Facilitator {\n    this.extensions.set(extension.key, extension);\n    return this;\n  }\n\n  /**\n   * Gets the list of registered extension keys.\n   *\n   * @returns Array of extension key strings\n   */\n  getExtensions(): string[] {\n    return Array.from(this.extensions.keys());\n  }\n\n  /**\n   * Gets a registered extension by key.\n   *\n   * @param key - The extension key to look up\n   * @returns The extension object, or undefined if not registered\n   */\n  getExtension<T extends FacilitatorExtension = FacilitatorExtension>(key: string): T | undefined {\n    return this.extensions.get(key) as T | undefined;\n  }\n\n  /**\n   * Register a hook to execute before facilitator payment verification.\n   * Can abort verification by returning { abort: true, reason: string }\n   *\n   * @param hook - The hook function to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  onBeforeVerify(hook: FacilitatorBeforeVerifyHook): x402Facilitator {\n    this.beforeVerifyHooks.push(hook);\n    return this;\n  }\n\n  /**\n   * Register a hook to execute after successful facilitator payment verification (isValid: true).\n   * This hook is NOT called when verification fails (isValid: false) - use onVerifyFailure for that.\n   *\n   * @param hook - The hook function to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  onAfterVerify(hook: FacilitatorAfterVerifyHook): x402Facilitator {\n    this.afterVerifyHooks.push(hook);\n    return this;\n  }\n\n  /**\n   * Register a hook to execute when facilitator payment verification fails.\n   * Called when: verification returns isValid: false, or an exception is thrown during verification.\n   * Can recover from failure by returning { recovered: true, result: VerifyResponse }\n   *\n   * @param hook - The hook function to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  onVerifyFailure(hook: FacilitatorOnVerifyFailureHook): x402Facilitator {\n    this.onVerifyFailureHooks.push(hook);\n    return this;\n  }\n\n  /**\n   * Register a hook to execute before facilitator payment settlement.\n   * Can abort settlement by returning { abort: true, reason: string }\n   *\n   * @param hook - The hook function to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  onBeforeSettle(hook: FacilitatorBeforeSettleHook): x402Facilitator {\n    this.beforeSettleHooks.push(hook);\n    return this;\n  }\n\n  /**\n   * Register a hook to execute after successful facilitator payment settlement.\n   *\n   * @param hook - The hook function to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  onAfterSettle(hook: FacilitatorAfterSettleHook): x402Facilitator {\n    this.afterSettleHooks.push(hook);\n    return this;\n  }\n\n  /**\n   * Register a hook to execute when facilitator payment settlement fails.\n   * Can recover from failure by returning { recovered: true, result: SettleResponse }\n   *\n   * @param hook - The hook function to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  onSettleFailure(hook: FacilitatorOnSettleFailureHook): x402Facilitator {\n    this.onSettleFailureHooks.push(hook);\n    return this;\n  }\n\n  /**\n   * Gets supported payment kinds, extensions, and signers.\n   * Uses networks registered during register() calls - no parameters needed.\n   * Returns flat array format for backward compatibility with V1 clients.\n   *\n   * @returns Supported response with kinds as array (with version in each element), extensions, and signers\n   */\n  getSupported(): {\n    kinds: Array<{\n      x402Version: number;\n      scheme: string;\n      network: string;\n      extra?: Record<string, unknown>;\n    }>;\n    extensions: string[];\n    signers: Record<string, string[]>;\n  } {\n    const kinds: Array<{\n      x402Version: number;\n      scheme: string;\n      network: string;\n      extra?: Record<string, unknown>;\n    }> = [];\n    const signersByFamily: Record<string, Set<string>> = {};\n\n    // Iterate over registered scheme data (array supports multiple facilitators per version)\n    for (const [version, schemeDataArray] of this.registeredFacilitatorSchemes) {\n      for (const schemeData of schemeDataArray) {\n        const { facilitator, networks } = schemeData;\n        const scheme = facilitator.scheme;\n\n        // Iterate over stored concrete networks\n        for (const network of networks) {\n          const extra = facilitator.getExtra(network);\n          kinds.push({\n            x402Version: version,\n            scheme,\n            network,\n            ...(extra && { extra }),\n          });\n\n          // Collect signers by CAIP family for this network\n          const family = facilitator.caipFamily;\n          if (!signersByFamily[family]) {\n            signersByFamily[family] = new Set();\n          }\n          facilitator.getSigners(network).forEach(signer => signersByFamily[family].add(signer));\n        }\n      }\n    }\n\n    // Convert signer sets to arrays\n    const signers: Record<string, string[]> = {};\n    for (const [family, signerSet] of Object.entries(signersByFamily)) {\n      signers[family] = Array.from(signerSet);\n    }\n\n    return {\n      kinds,\n      extensions: this.getExtensions(),\n      signers,\n    };\n  }\n\n  /**\n   * Verifies a payment payload against requirements.\n   *\n   * @param paymentPayload - The payment payload to verify\n   * @param paymentRequirements - The payment requirements to verify against\n   * @returns Promise resolving to the verification response\n   */\n  async verify(\n    paymentPayload: PaymentPayload,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<VerifyResponse> {\n    const context: FacilitatorVerifyContext = {\n      paymentPayload,\n      requirements: paymentRequirements,\n    };\n\n    // Execute beforeVerify hooks\n    for (const hook of this.beforeVerifyHooks) {\n      const result = await hook(context);\n      if (result && \"abort\" in result && result.abort) {\n        return {\n          isValid: false,\n          invalidReason: result.reason,\n        };\n      }\n    }\n\n    try {\n      const schemeDataArray = this.registeredFacilitatorSchemes.get(paymentPayload.x402Version);\n      if (!schemeDataArray) {\n        throw new Error(\n          `No facilitator registered for x402 version: ${paymentPayload.x402Version}`,\n        );\n      }\n\n      // Find matching facilitator from array\n      let schemeNetworkFacilitator: SchemeNetworkFacilitator | undefined;\n      for (const schemeData of schemeDataArray) {\n        if (schemeData.facilitator.scheme === paymentRequirements.scheme) {\n          // Check if network matches\n          if (schemeData.networks.has(paymentRequirements.network)) {\n            schemeNetworkFacilitator = schemeData.facilitator;\n            break;\n          }\n          // Try pattern matching\n          const patternRegex = new RegExp(\"^\" + schemeData.pattern.replace(\"*\", \".*\") + \"$\");\n          if (patternRegex.test(paymentRequirements.network)) {\n            schemeNetworkFacilitator = schemeData.facilitator;\n            break;\n          }\n        }\n      }\n\n      if (!schemeNetworkFacilitator) {\n        throw new Error(\n          `No facilitator registered for scheme: ${paymentRequirements.scheme} and network: ${paymentRequirements.network}`,\n        );\n      }\n\n      const facilitatorContext = this.buildFacilitatorContext();\n      const verifyResult = await schemeNetworkFacilitator.verify(\n        paymentPayload,\n        paymentRequirements,\n        facilitatorContext,\n      );\n\n      // Check if verification failed (isValid: false)\n      if (!verifyResult.isValid) {\n        const failureContext: FacilitatorVerifyFailureContext = {\n          ...context,\n          error: new Error(verifyResult.invalidReason || \"Verification failed\"),\n        };\n\n        // Execute onVerifyFailure hooks\n        for (const hook of this.onVerifyFailureHooks) {\n          const result = await hook(failureContext);\n          if (result && \"recovered\" in result && result.recovered) {\n            // If recovered, execute afterVerify hooks with recovered result\n            const recoveredContext: FacilitatorVerifyResultContext = {\n              ...context,\n              result: result.result,\n            };\n            for (const hook of this.afterVerifyHooks) {\n              await hook(recoveredContext);\n            }\n            return result.result;\n          }\n        }\n\n        return verifyResult;\n      }\n\n      // Execute afterVerify hooks only for successful verification\n      const resultContext: FacilitatorVerifyResultContext = {\n        ...context,\n        result: verifyResult,\n      };\n\n      for (const hook of this.afterVerifyHooks) {\n        await hook(resultContext);\n      }\n\n      return verifyResult;\n    } catch (error) {\n      const failureContext: FacilitatorVerifyFailureContext = {\n        ...context,\n        error: error as Error,\n      };\n\n      // Execute onVerifyFailure hooks\n      for (const hook of this.onVerifyFailureHooks) {\n        const result = await hook(failureContext);\n        if (result && \"recovered\" in result && result.recovered) {\n          return result.result;\n        }\n      }\n\n      throw error;\n    }\n  }\n\n  /**\n   * Settles a payment based on the payload and requirements.\n   *\n   * @param paymentPayload - The payment payload to settle\n   * @param paymentRequirements - The payment requirements for settlement\n   * @returns Promise resolving to the settlement response\n   */\n  async settle(\n    paymentPayload: PaymentPayload,\n    paymentRequirements: PaymentRequirements,\n  ): Promise<SettleResponse> {\n    const context: FacilitatorSettleContext = {\n      paymentPayload,\n      requirements: paymentRequirements,\n    };\n\n    // Execute beforeSettle hooks\n    for (const hook of this.beforeSettleHooks) {\n      const result = await hook(context);\n      if (result && \"abort\" in result && result.abort) {\n        throw new Error(`Settlement aborted: ${result.reason}`);\n      }\n    }\n\n    try {\n      const schemeDataArray = this.registeredFacilitatorSchemes.get(paymentPayload.x402Version);\n      if (!schemeDataArray) {\n        throw new Error(\n          `No facilitator registered for x402 version: ${paymentPayload.x402Version}`,\n        );\n      }\n\n      // Find matching facilitator from array\n      let schemeNetworkFacilitator: SchemeNetworkFacilitator | undefined;\n      for (const schemeData of schemeDataArray) {\n        if (schemeData.facilitator.scheme === paymentRequirements.scheme) {\n          // Check if network matches\n          if (schemeData.networks.has(paymentRequirements.network)) {\n            schemeNetworkFacilitator = schemeData.facilitator;\n            break;\n          }\n          // Try pattern matching\n          const patternRegex = new RegExp(\"^\" + schemeData.pattern.replace(\"*\", \".*\") + \"$\");\n          if (patternRegex.test(paymentRequirements.network)) {\n            schemeNetworkFacilitator = schemeData.facilitator;\n            break;\n          }\n        }\n      }\n\n      if (!schemeNetworkFacilitator) {\n        throw new Error(\n          `No facilitator registered for scheme: ${paymentRequirements.scheme} and network: ${paymentRequirements.network}`,\n        );\n      }\n\n      const facilitatorContext = this.buildFacilitatorContext();\n      const settleResult = await schemeNetworkFacilitator.settle(\n        paymentPayload,\n        paymentRequirements,\n        facilitatorContext,\n      );\n\n      // Execute afterSettle hooks\n      const resultContext: FacilitatorSettleResultContext = {\n        ...context,\n        result: settleResult,\n      };\n\n      for (const hook of this.afterSettleHooks) {\n        await hook(resultContext);\n      }\n\n      return settleResult;\n    } catch (error) {\n      const failureContext: FacilitatorSettleFailureContext = {\n        ...context,\n        error: error as Error,\n      };\n\n      // Execute onSettleFailure hooks\n      for (const hook of this.onSettleFailureHooks) {\n        const result = await hook(failureContext);\n        if (result && \"recovered\" in result && result.recovered) {\n          return result.result;\n        }\n      }\n\n      throw error;\n    }\n  }\n\n  /**\n   * Builds a FacilitatorContext from the registered extensions map.\n   * Passed to mechanism verify/settle so they can access extension capabilities.\n   *\n   * @returns A FacilitatorContext backed by this facilitator's registered extensions\n   */\n  private buildFacilitatorContext(): FacilitatorContext {\n    const extensionsMap = this.extensions;\n    return {\n      getExtension<T extends FacilitatorExtension = FacilitatorExtension>(\n        key: string,\n      ): T | undefined {\n        return extensionsMap.get(key) as T | undefined;\n      },\n    };\n  }\n\n  /**\n   * Internal method to register a scheme facilitator.\n   *\n   * @param x402Version - The x402 protocol version\n   * @param networks - Array of concrete networks this facilitator supports\n   * @param facilitator - The scheme network facilitator to register\n   * @returns The x402Facilitator instance for chaining\n   */\n  private _registerScheme(\n    x402Version: number,\n    networks: Network[],\n    facilitator: SchemeNetworkFacilitator,\n  ): x402Facilitator {\n    if (!this.registeredFacilitatorSchemes.has(x402Version)) {\n      this.registeredFacilitatorSchemes.set(x402Version, []);\n    }\n    const schemeDataArray = this.registeredFacilitatorSchemes.get(x402Version)!;\n\n    // Add new scheme data (supports multiple facilitators with same scheme name)\n    schemeDataArray.push({\n      facilitator,\n      networks: new Set(networks),\n      pattern: this.derivePattern(networks),\n    });\n\n    return this;\n  }\n\n  /**\n   * Derives a wildcard pattern from an array of networks.\n   * If all networks share the same namespace, returns wildcard pattern.\n   * Otherwise returns the first network for exact matching.\n   *\n   * @param networks - Array of networks\n   * @returns Derived pattern for matching\n   */\n  private derivePattern(networks: Network[]): Network {\n    if (networks.length === 0) return \"\" as Network;\n    if (networks.length === 1) return networks[0];\n\n    // Extract namespaces (e.g., \"eip155\" from \"eip155:84532\")\n    const namespaces = networks.map(n => n.split(\":\")[0]);\n    const uniqueNamespaces = new Set(namespaces);\n\n    // If all same namespace, use wildcard\n    if (uniqueNamespaces.size === 1) {\n      return `${namespaces[0]}:*` as Network;\n    }\n\n    // Mixed namespaces - use first network for exact matching\n    return networks[0];\n  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