{"version":3,"sources":["../../../../src/exact/facilitator/scheme.ts"],"sourcesContent":["import { AccountAddress, Deserializer, Ed25519PublicKey, PublicKey } from \"@aptos-labs/ts-sdk\";\nimport type {\n PaymentPayload,\n PaymentRequirements,\n SchemeNetworkFacilitator,\n SettleResponse,\n VerifyResponse,\n} from \"@bankofai/x402-core/types\";\nimport type { FacilitatorAptosSigner } from \"../../signer\";\nimport type { ExactAptosPayload } from \"../../types\";\nimport { createAptosClient, deserializeAptosPayment } from \"../../utils\";\nimport { getAptosChainId, MAX_GAS_AMOUNT } from \"../../constants\";\n\n/**\n * Aptos facilitator implementation for the Exact payment scheme.\n */\nexport class ExactAptosScheme implements SchemeNetworkFacilitator {\n readonly scheme = \"exact\";\n readonly caipFamily = \"aptos:*\";\n\n /**\n * Creates a new ExactAptosFacilitator instance.\n *\n * @param signer - The Aptos facilitator signer for transaction submission\n * @param sponsorTransactions - Whether to sponsor transactions (pay gas fees). Defaults to true.\n */\n constructor(\n private readonly signer: FacilitatorAptosSigner,\n private readonly sponsorTransactions: boolean = true,\n ) {}\n\n /**\n * Get mechanism-specific extra data for the supported kinds endpoint.\n *\n * @param _ - The network identifier (unused)\n * @returns Extra data with fee payer address, or undefined if sponsorship is disabled\n */\n getExtra(_: string): Record | undefined {\n if (!this.sponsorTransactions) {\n return undefined;\n }\n const addresses = this.signer.getAddresses();\n const randomIndex = Math.floor(Math.random() * addresses.length);\n return { feePayer: addresses[randomIndex] };\n }\n\n /**\n * Get signer addresses used by this facilitator.\n *\n * @param _ - The network identifier (unused)\n * @returns Array of fee payer addresses\n */\n getSigners(_: string): string[] {\n return [...this.signer.getAddresses()];\n }\n\n /**\n * Verifies a payment payload.\n *\n * @param payload - The payment payload to verify\n * @param requirements - The payment requirements\n * @returns Promise resolving to verification response\n */\n async verify(\n payload: PaymentPayload,\n requirements: PaymentRequirements,\n ): Promise {\n try {\n const aptosPayload = payload.payload as ExactAptosPayload;\n const signerAddresses = this.signer.getAddresses();\n const isSponsored = typeof requirements.extra?.feePayer === \"string\";\n\n // Step 2: Verify x402Version is 2\n if (payload.x402Version !== 2) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_unsupported_version\",\n payer: \"\",\n };\n }\n\n // Step 3: Verify the network matches\n if (payload.accepted.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n return { isValid: false, invalidReason: \"unsupported_scheme\", payer: \"\" };\n }\n\n if (payload.accepted.network !== requirements.network) {\n return { isValid: false, invalidReason: \"network_mismatch\", payer: \"\" };\n }\n\n // If sponsored, verify the fee payer is managed by this facilitator\n if (isSponsored && !signerAddresses.includes(requirements.extra.feePayer as string)) {\n return { isValid: false, invalidReason: \"fee_payer_not_managed_by_facilitator\", payer: \"\" };\n }\n\n // Step 4: Deserialize the BCS-encoded transaction and verify the signature\n const { transaction, senderAuthenticator, entryFunction } = deserializeAptosPayment(\n aptosPayload.transaction,\n );\n const senderAddress = transaction.rawTransaction.sender.toString();\n\n // Verify chain ID matches expected network\n const expectedChainId = getAptosChainId(requirements.network);\n const txChainId = Number(transaction.rawTransaction.chain_id.chainId);\n if (txChainId !== expectedChainId) {\n return {\n isValid: false,\n invalidReason: `invalid_exact_aptos_payload_chain_id_mismatch: expected ${expectedChainId}, got ${txChainId}`,\n payer: senderAddress,\n };\n }\n\n // Verify sender matches authenticator public key (for Ed25519 accounts)\n // Note: SingleKey and MultiKey authenticators are validated during simulation (step 11)\n if (senderAuthenticator.isEd25519()) {\n const pubKey = senderAuthenticator.public_key as Ed25519PublicKey;\n const derivedAddress = AccountAddress.from(pubKey.authKey().derivedAddress());\n if (!derivedAddress.equals(transaction.rawTransaction.sender)) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_sender_authenticator_mismatch\",\n payer: senderAddress,\n };\n }\n }\n\n // For sponsored transactions, verify max gas to prevent gas draining\n if (isSponsored) {\n const maxGasAmount = BigInt(transaction.rawTransaction.max_gas_amount);\n if (maxGasAmount > MAX_GAS_AMOUNT) {\n return {\n isValid: false,\n invalidReason: `invalid_exact_aptos_payload_gas_too_high: ${maxGasAmount} > ${MAX_GAS_AMOUNT}`,\n payer: senderAddress,\n };\n }\n }\n\n // For sponsored transactions, verify fee payer address matches\n if (isSponsored) {\n const expectedFeePayer = AccountAddress.from(requirements.extra.feePayer as string);\n if (!transaction.feePayerAddress || !expectedFeePayer.equals(transaction.feePayerAddress)) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_fee_payer_mismatch\",\n payer: senderAddress,\n };\n }\n }\n\n // SECURITY (reference implementation): Prevent facilitator from signing away their own tokens\n if (isSponsored && signerAddresses.includes(senderAddress)) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_fee_payer_transferring_funds\",\n payer: senderAddress,\n };\n }\n\n // Step 5: Verify the transaction has not expired\n const EXPIRATION_BUFFER_SECONDS = 5;\n const expirationTimestamp = Number(transaction.rawTransaction.expiration_timestamp_secs);\n if (expirationTimestamp < Math.floor(Date.now() / 1000) + EXPIRATION_BUFFER_SECONDS) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_transaction_expired\",\n payer: senderAddress,\n };\n }\n\n // Step 6: Verify the transaction contains a fungible asset transfer operation\n // We accept both primary_fungible_store::transfer and fungible_asset::transfer:\n // - primary_fungible_store::transfer operates on primary stores (the default store for each asset)\n // and automatically creates the recipient's store if it doesn't exist\n // - fungible_asset::transfer is a lower-level function for arbitrary store-to-store transfers\n // and is more gas efficient when stores already exist\n if (!entryFunction) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_missing_entry_function\",\n payer: senderAddress,\n };\n }\n\n const moduleAddress = entryFunction.module_name.address;\n const moduleName = entryFunction.module_name.name.identifier;\n const functionName = entryFunction.function_name.identifier;\n\n const isPrimaryFungibleStore =\n AccountAddress.ONE.equals(moduleAddress) &&\n moduleName === \"primary_fungible_store\" &&\n functionName === \"transfer\";\n\n const isFungibleAsset =\n 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\"invalid_exact_aptos_payload_asset_mismatch\",\n payer: senderAddress,\n };\n }\n\n // Step 8: Verify the transfer amount matches\n const amount = new Deserializer(amountArg.bcsToBytes()).deserializeU64().toString(10);\n if (amount !== requirements.amount) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_amount_mismatch\",\n payer: senderAddress,\n };\n }\n\n // Step 9: Verify the transfer recipient matches\n const recipientAddress = AccountAddress.from(recipientAddressArg.bcsToBytes());\n if (!recipientAddress.equals(AccountAddress.from(requirements.payTo))) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_recipient_mismatch\",\n payer: senderAddress,\n };\n }\n\n // Step 10: Verify the sender has sufficient balance\n const aptos = createAptosClient(requirements.network);\n const balance = await aptos.getCurrentFungibleAssetBalances({\n options: {\n where: {\n owner_address: { _eq: senderAddress },\n asset_type: { _eq: requirements.asset },\n },\n },\n });\n const currentBalance = BigInt(balance[0]?.amount ?? 0);\n if (currentBalance < BigInt(requirements.amount)) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_aptos_payload_insufficient_balance\",\n payer: senderAddress,\n };\n }\n\n // Step 11: Simulate the transaction\n let publicKey: PublicKey | undefined;\n if (senderAuthenticator.isEd25519()) {\n publicKey = senderAuthenticator.public_key;\n } else if (senderAuthenticator.isSingleKey()) {\n publicKey = senderAuthenticator.public_key;\n } else if (senderAuthenticator.isMultiKey()) {\n publicKey = senderAuthenticator.public_keys;\n }\n\n const simulationResult = (\n await aptos.transaction.simulate.simple({ signerPublicKey: publicKey, transaction })\n )[0];\n\n if (!simulationResult.success) {\n return {\n isValid: false,\n invalidReason: `invalid_exact_aptos_payload_simulation_failed: ${simulationResult.vm_status}`,\n payer: senderAddress,\n };\n }\n\n return { isValid: true, invalidReason: undefined, payer: senderAddress };\n } catch (error) {\n const errorMessage = error instanceof Error ? error.message : String(error);\n return {\n isValid: false,\n invalidReason: `invalid_exact_aptos_payload_verification_error: ${errorMessage}`,\n payer: \"\",\n };\n }\n }\n\n /**\n * Settles a payment by submitting the transaction.\n *\n * @param payload - The payment payload to settle\n * @param requirements - The payment requirements\n * @returns Promise resolving to settlement response\n */\n async settle(\n payload: PaymentPayload,\n requirements: PaymentRequirements,\n ): Promise {\n const aptosPayload = payload.payload as ExactAptosPayload;\n\n const valid = await this.verify(payload, requirements);\n if (!valid.isValid) {\n return {\n success: false,\n network: payload.accepted.network,\n transaction: \"\",\n errorReason: valid.invalidReason ?? \"verification_failed\",\n payer: valid.payer || \"\",\n };\n }\n\n try {\n const { transaction, senderAuthenticator } 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