@chainbound/payflow-sdk/dist/index.cjs.map

Payflow SDK

{"version":3,"sources":["../src/index.ts"],"sourcesContent":["import type { ServerOptions } from '@modelcontextprotocol/sdk/server/index.js';\nimport type { RequestHandlerExtra } from '@modelcontextprotocol/sdk/shared/protocol.js';\nimport { McpServer, type RegisteredTool, type ToolCallback } from '@modelcontextprotocol/sdk/server/mcp.js';\nimport type {\n  CallToolResult,\n  Implementation,\n  ServerNotification,\n  ServerRequest,\n  ToolAnnotations,\n} from '@modelcontextprotocol/sdk/types.js';\nimport { z, type ZodRawShape, type ZodTypeAny } from 'zod';\nimport debug from 'debug';\nimport type { Network, PaymentPayload, PaymentRequirements, SettleResponse, VerifyResponse } from 'x402/types';\nimport { ErrorReasons } from 'x402/types';\nimport { useFacilitator } from 'x402/verify';\nimport { createFacilitatorConfig } from '@coinbase/x402';\nimport { exact } from 'x402/schemes';\nimport { findMatchingPaymentRequirements, processPriceToAtomicAmount } from 'x402/shared';\n\n/**\n * Options for a paid tool.\n */\nexport type PaymentOptions = {\n  /**\n   * The price of the tool in the given asset.\n   */\n  price: number;\n  /**\n   * The recipient of the payment.\n   */\n  recipient: string;\n  /**\n   * The asset to use for the tool.\n   */\n  asset?: string;\n  /**\n   * The network to settle the payment on.\n   */\n  network?: number | string;\n};\n\ntype PayflowOptions = {\n  x402?: {\n    /**\n     * The version of the x402 protocol to use.\n     */\n    version?: number;\n    /**\n     * The API key ID for the Coinbase X402 facilitator.\n     */\n    keyId?: string;\n    /**\n     * The API key secret for the Coinbase X402 facilitator.\n     */\n    keySecret?: string;\n  };\n};\n\nexport type PayflowMcpServerOptions = ServerOptions & PayflowOptions;\n\n/**\n * An extended MCP server that supports paid tools.\n */\nexport class PayflowMcpServer extends McpServer {\n  private readonly log: debug.Debugger;\n  private readonly options: PayflowOptions;\n  private readonly verify: (\n    payload: PaymentPayload,\n    paymentRequirements: PaymentRequirements\n  ) => Promise<VerifyResponse>;\n  private readonly settle: (\n    payload: PaymentPayload,\n    paymentRequirements: PaymentRequirements\n  ) => Promise<SettleResponse>;\n  /**\n   * Creates a new PayflowMcpServer instance.\n   *\n   * @param serverInfo - The server implementation details including name and version\n   * @param options - Optional configuration for the server including x402 payment settings\n   *\n   * @example\n   * ```typescript\n   * const server = new PayflowMcpServer({\n   *   name: 'my-paid-server',\n   *   version: '1.0.0'\n   * }, {\n   *   x402: {\n   *     version: 1,\n   *     keyId: 'your-api-key-id',\n   *     keySecret: 'your-api-key-secret'\n   *   }\n   * });\n   * ```\n   */\n  constructor(serverInfo: Implementation, options?: PayflowMcpServerOptions) {\n    super(serverInfo, options);\n    this.log = debug('payflow-sdk');\n\n    // Define default x402 options\n    const defaultX402Options = {\n      version: 1,\n      keyId: process.env.CDP_API_KEY_ID,\n      keySecret: process.env.CDP_API_KEY_SECRET,\n    };\n\n    // Merge user options with defaults\n    this.options = {\n      x402: {\n        ...defaultX402Options,\n        ...(options?.x402 || {}),\n      },\n    };\n\n    const { verify, settle } = useFacilitator(\n      createFacilitatorConfig(this.options.x402?.keyId, this.options.x402?.keySecret)\n    );\n    this.verify = verify;\n    this.settle = settle;\n  }\n\n  private generateRequirements(\n    payload: PaymentPayload,\n    tool: string,\n    price: number,\n    recipient: string,\n    network: Network\n  ): PaymentRequirements {\n    // TODO: support other assets\n    const atomicAmountForAsset = processPriceToAtomicAmount(price, network);\n    if ('error' in atomicAmountForAsset) {\n      throw new Error(atomicAmountForAsset.error);\n    }\n\n    const { maxAmountRequired, asset } = atomicAmountForAsset;\n\n    const paymentRequirements: PaymentRequirements[] = [\n      {\n        scheme: 'exact',\n        network: network,\n        maxAmountRequired,\n        resource: tool,\n        // TODO: support description through arguments\n        description: '',\n        // TODO: support other mime types through arguments\n        mimeType: 'text/plain',\n        payTo: recipient,\n        maxTimeoutSeconds: 60,\n        asset: asset.address,\n        outputSchema: undefined,\n        extra: {\n          name: asset.eip712.name,\n          version: asset.eip712.version,\n        },\n      },\n    ];\n\n    // NOTE: This ONLY finds matches on the scheme and the network. Nothing else!\n    const selectedPaymentRequirements = findMatchingPaymentRequirements(paymentRequirements, payload);\n    if (!selectedPaymentRequirements) {\n      throw new Error('No matching payment requirements found');\n    }\n\n    return selectedPaymentRequirements;\n  }\n\n  private async verifyPayment(payload: PaymentPayload, requirements: PaymentRequirements) {\n    const verifyResponse = await this.verify(payload, requirements);\n\n    if (!verifyResponse.isValid) {\n      throw enrichVerificationError(requirements, verifyResponse.invalidReason);\n    }\n  }\n\n  private async settlePayment(\n    payload: PaymentPayload,\n    paymentRequirements: PaymentRequirements\n  ): Promise<SettleResponse> {\n    const settleResponse = await this.settle(payload, paymentRequirements);\n    if (!settleResponse.success) {\n      throw new Error(settleResponse.errorReason);\n    }\n\n    return settleResponse;\n  }\n\n  private createPaidCallback<ArgsSchema extends ZodTypeAny>(\n    name: string,\n    price: number,\n    recipient: string,\n    schema: ArgsSchema,\n    cb: ToolCallback\n  ): (\n    args: z.infer<ArgsSchema> & { payment: string },\n    context: RequestHandlerExtra<ServerRequest, ServerNotification>\n  ) => Promise<any> {\n    return async (args, context) => {\n      this.log('Called paid tool:', name, args);\n\n      // Validate args using the schema (excluding payment)\n      const { payment, ...toolArgs } = args;\n      schema.parse(toolArgs); // throws if invalid\n\n      // Step 0: Decode the payment.\n      const payload = exact.evm.decodePayment(payment);\n      payload.x402Version = this.options.x402?.version ?? 1;\n\n      let requirements: PaymentRequirements;\n      try {\n        requirements = this.generateRequirements(payload, name, price, recipient, 'base');\n      } catch (error) {\n        this.log('Error generating requirements:', error);\n        return {\n          content: [{ type: 'text', text: error instanceof Error ? error.message : String(error), isError: true }],\n        };\n      }\n\n      // Step 1: Verify the payment.\n      try {\n        await this.verifyPayment(payload, requirements);\n      } catch (error) {\n        this.log('Error verifying payment:', error);\n        return {\n          content: [{ type: 'text', text: error instanceof Error ? error.message : String(error), isError: true }],\n        };\n      }\n\n      // Step 2: Handle the tool call.\n      let result: CallToolResult;\n      try {\n        if (cb.length > 1) {\n          // Callback expects (args, context)\n          result = await (cb as any)(toolArgs, context);\n        } else {\n          // Callback expects only (context)\n          result = await cb(context);\n        }\n      } catch (error) {\n        this.log('Error in tool call:', error);\n        return {\n          content: [{ type: 'text', text: error instanceof Error ? error.message : String(error), isError: true }],\n        };\n      }\n\n      // Step 3: Settle the payment.\n      let settleResponse: SettleResponse;\n      try {\n        settleResponse = await this.settlePayment(payload, requirements);\n      } catch (error) {\n        this.log('Error settling payment:', error);\n        return {\n          content: [{ type: 'text', text: error instanceof Error ? error.message : String(error), isError: true }],\n        };\n      }\n\n      // Add the payment reference to the existing result.\n      result.content.push({\n        type: 'text',\n        text: `Payment: ${settleResponse.transaction}`,\n      });\n\n      // Step 4: Return the result.\n      return result;\n    };\n  }\n\n  // Overload signatures\n  public paidTool(name: string, options: PaymentOptions, cb: ToolCallback): RegisteredTool;\n  public paidTool(name: string, description: string, options: PaymentOptions, cb: ToolCallback): RegisteredTool;\n  public paidTool<Args extends ZodRawShape>(\n    name: string,\n    options: PaymentOptions,\n    paramsSchema: Args,\n    cb: ToolCallback<Args>\n  ): RegisteredTool;\n  public paidTool<Args extends ZodRawShape>(\n    name: string,\n    description: string,\n    options: PaymentOptions,\n    paramsSchema: Args,\n    cb: ToolCallback<Args>\n  ): RegisteredTool;\n  public paidTool<Args extends ZodRawShape>(\n    name: string,\n    options: PaymentOptions,\n    paramsSchema: Args,\n    annotations: ToolAnnotations,\n    cb: ToolCallback<Args>\n  ): RegisteredTool;\n  public paidTool<Args extends ZodRawShape>(\n    name: string,\n    description: string,\n    options: PaymentOptions,\n    paramsSchema: Args,\n    annotations: ToolAnnotations,\n    cb: ToolCallback<Args>\n  ): RegisteredTool;\n\n  /**\n   * paidTool() implementation. Parses and processes the argument defined in the overloaded signatures.\n   */\n  public paidTool(name: string, ...rest: any[]): RegisteredTool {\n    let description: string | undefined;\n    let paymentOptions: PaymentOptions | undefined;\n    let inputSchema: ZodRawShape | undefined;\n    let annotations: ToolAnnotations | undefined;\n\n    // Check for description as first argument\n    if (rest.length >= 1 && typeof rest[0] === 'string') {\n      description = rest.shift();\n    }\n\n    // Check for PaymentOptions object\n    if (\n      rest.length >= 1 &&\n      typeof rest[0] === 'object' &&\n      rest[0] !== null &&\n      'price' in rest[0] &&\n      'recipient' in rest[0]\n    ) {\n      paymentOptions = rest.shift() as PaymentOptions;\n    }\n\n    // Check for input schema or annotations\n    if (rest.length >= 1) {\n      if (this.isZodRawShape(rest[0])) {\n        inputSchema = rest.shift();\n      } else if (typeof rest[0] === 'object' && rest[0] !== null && 'title' in rest[0]) {\n        annotations = rest.shift();\n      }\n    }\n\n    // Check for annotations if not found yet\n    if (rest.length >= 1 && typeof rest[0] === 'object' && rest[0] !== null && 'title' in rest[0]) {\n      annotations = rest.shift();\n    }\n\n    if (rest.length > 1) {\n      throw new Error('Too many arguments to paidTool()');\n    }\n\n    if (!paymentOptions) {\n      throw new Error('PaymentOptions are required for paidTool()');\n    }\n\n    const cb = rest[0] as ToolCallback;\n\n    // Create the schema that includes payment field\n    const paymentSchema = z.object({\n      payment: z.string().describe('The x402 payment header for the query.'),\n    });\n\n    let finalSchema: ZodRawShape;\n    if (inputSchema) {\n      // Merge the input schema with payment schema\n      finalSchema = {\n        ...inputSchema,\n        payment: paymentSchema.shape.payment,\n      };\n    } else {\n      finalSchema = paymentSchema.shape;\n    }\n\n    // Create the schema object for createPaidCallback\n    const schemaForCallback = inputSchema ? z.object(inputSchema) : z.object({});\n\n    // Create the paid callback\n    const paidCb = this.createPaidCallback(\n      name,\n      paymentOptions.price,\n      paymentOptions.recipient,\n      schemaForCallback,\n      cb\n    ) as any;\n\n    // Generate description\n    const toolDescription = description || `Paid tool ${name}`;\n    const fullDescription = `${toolDescription}\\nIMPORTANT: Payflow payment details:\\n-Price: ${paymentOptions.price}\\n- Recipient: ${paymentOptions.recipient}`;\n\n    // Register the tool\n    if (annotations) {\n      return this.tool(name, fullDescription, finalSchema, annotations, paidCb);\n    } else {\n      return this.tool(name, fullDescription, finalSchema, paidCb);\n    }\n  }\n\n  // Helper function from MCP SDK to check if an object is a Zod schema\n  private isZodRawShape(obj: unknown): obj is ZodRawShape {\n    if (typeof obj !== 'object' || obj === null) return false;\n    const isEmptyObject = Object.keys(obj).length === 0;\n    // Check if object is empty or at least one property is a ZodType instance\n    return isEmptyObject || Object.values(obj as object).some(this.isZodTypeLike);\n  }\n\n  private isZodTypeLike(value: unknown): value is ZodTypeAny {\n    return (\n      value !== null &&\n      typeof value === 'object' &&\n      'parse' in value &&\n      typeof value.parse === 'function' &&\n      'safeParse' in value &&\n      typeof value.safeParse === 'function'\n    );\n  }\n}\n\nfunction enrichVerificationError(requirements: PaymentRequirements, reason?: (typeof ErrorReasons)[number]): Error {\n  switch (reason) {\n    case 'insufficient_funds':\n      return new Error(`${reason}: Insufficient funds for payment. Required: ${requirements.maxAmountRequired}`);\n    case 'invalid_exact_evm_payload_authorization_valid_after':\n      return new Error(`${reason}: Invalid validAfter value in the payment`);\n    case 'invalid_exact_evm_payload_authorization_valid_before':\n      return new Error(`${reason}: Invalid validBefore value in the payment`);\n    case 'invalid_exact_evm_payload_authorization_value':\n      return new Error(\n        `${reason}: The value of the payment is incorrect, it should be ${requirements.maxAmountRequired}`\n      );\n    case 'invalid_exact_evm_payload_signature':\n      return new Error(`${reason}: Invalid signature in the payment`);\n    case 'invalid_exact_evm_payload_recipient_mismatch':\n      return new Error(`${reason}: Recipient mismatch in the payment. Pay to: ${requirements.payTo}`);\n    case 'invalid_network':\n      return new Error(`${reason}: Invalid network in the payment. Network: ${requirements.network}`);\n    default:\n      return new Error(`Payment verification failed: ${reason || 'unknown reason'}`);\n  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