{"version":3,"sources":["../../src/exact/v1/facilitator/scheme.ts"],"sourcesContent":["import {\n COMPUTE_BUDGET_PROGRAM_ADDRESS,\n parseSetComputeUnitLimitInstruction,\n parseSetComputeUnitPriceInstruction,\n} from \"@solana-program/compute-budget\";\nimport {\n parseTransferCheckedInstruction as parseTransferCheckedInstructionToken,\n TOKEN_PROGRAM_ADDRESS,\n} from \"@solana-program/token\";\nimport {\n findAssociatedTokenPda,\n parseTransferCheckedInstruction as parseTransferCheckedInstruction2022,\n TOKEN_2022_PROGRAM_ADDRESS,\n} from \"@solana-program/token-2022\";\nimport {\n decompileTransactionMessage,\n getCompiledTransactionMessageDecoder,\n type Address,\n} from \"@solana/kit\";\nimport type {\n PaymentPayload,\n PaymentRequirements,\n SchemeNetworkFacilitator,\n SettleResponse,\n VerifyResponse,\n} from \"@payai/x402/types\";\nimport type { PaymentPayloadV1, PaymentRequirementsV1 } from \"@payai/x402/types/v1\";\nimport {\n LIGHTHOUSE_PROGRAM_ADDRESS,\n MAX_COMPUTE_UNIT_LIMIT,\n MAX_COMPUTE_UNIT_PRICE_MICROLAMPORTS,\n MAX_REQUIRED_SIGNATURES,\n MEMO_PROGRAM_ADDRESS,\n} from \"../../../constants\";\nimport { SettlementCache } from \"../../../settlement-cache\";\nimport type { FacilitatorSvmSigner } from \"../../../signer\";\nimport type { ExactSvmPayloadV1 } from \"../../../types\";\nimport {\n decodeTransactionFromPayload,\n getTokenPayerFromTransaction,\n transactionMessageHash,\n} from \"../../../utils\";\n\n/**\n * SVM facilitator implementation for the Exact payment scheme (V1).\n */\nexport class ExactSvmSchemeV1 implements SchemeNetworkFacilitator {\n readonly scheme = \"exact\";\n readonly caipFamily = \"solana:*\";\n\n private readonly settlementCache: SettlementCache;\n\n /**\n * Creates a new ExactSvmFacilitatorV1 instance.\n *\n * @param signer - The SVM RPC client for facilitator operations\n * @param settlementCache - Optional shared settlement cache (one is created if omitted)\n * @returns ExactSvmFacilitatorV1 instance\n */\n constructor(\n private readonly signer: FacilitatorSvmSigner,\n settlementCache?: SettlementCache,\n ) {\n this.settlementCache = settlementCache ?? new SettlementCache();\n }\n\n /**\n * Get mechanism-specific extra data for the supported kinds endpoint.\n * For SVM, this includes a randomly selected fee payer address.\n * Random selection distributes load across multiple signers.\n *\n * @param _ - The network identifier (unused for SVM)\n * @returns Extra data with feePayer address\n */\n getExtra(_: string): Record | undefined {\n // Randomly select from available signers to distribute load\n const addresses = this.signer.getAddresses();\n const randomIndex = Math.floor(Math.random() * addresses.length);\n\n return {\n feePayer: addresses[randomIndex],\n };\n }\n\n /**\n * Get signer addresses used by this facilitator.\n * For SVM, returns all available fee payer addresses.\n *\n * @param _ - The network identifier (unused for SVM)\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 (V1).\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 const requirementsV1 = requirements as unknown as PaymentRequirementsV1;\n const payloadV1 = payload as unknown as PaymentPayloadV1;\n const exactSvmPayload = payload.payload as ExactSvmPayloadV1;\n\n // Step 1: Validate Payment Requirements\n if (payloadV1.scheme !== \"exact\" || requirements.scheme !== \"exact\") {\n return {\n isValid: false,\n invalidReason: \"unsupported_scheme\",\n payer: \"\",\n };\n }\n\n if (payloadV1.network !== requirements.network) {\n return {\n isValid: false,\n invalidReason: \"network_mismatch\",\n payer: \"\",\n };\n }\n\n if (!requirementsV1.extra?.feePayer || typeof requirementsV1.extra.feePayer !== \"string\") {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_missing_fee_payer\",\n payer: \"\",\n };\n }\n\n // Verify that the requested feePayer is managed by this facilitator\n const signerAddresses = this.signer.getAddresses().map(addr => addr.toString());\n if (!signerAddresses.includes(requirementsV1.extra.feePayer)) {\n return {\n isValid: false,\n invalidReason: \"fee_payer_not_managed_by_facilitator\",\n payer: \"\",\n };\n }\n\n // Step 2: Parse and Validate Transaction Structure\n let transaction;\n try {\n transaction = decodeTransactionFromPayload(exactSvmPayload);\n } catch {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_transaction_could_not_be_decoded\",\n payer: \"\",\n };\n }\n\n const compiled = getCompiledTransactionMessageDecoder().decode(transaction.messageBytes);\n const decompiled = decompileTransactionMessage(compiled);\n const instructions = decompiled.instructions ?? [];\n\n // Security check: Verify signer count to prevent multi-sig spam attacks\n // Typical x402 flow requires only 2 signatures (payer + fee payer)\n //\n // NOTE:\n // Different `@solana/kit` major versions expose different header field names.\n // - newer: `numRequiredSignatures` (canonical Solana name)\n // - older: `numSignerAccounts`\n // We support both to avoid dependency/version drift in downstream wrappers.\n const header = compiled.header as unknown as {\n numRequiredSignatures?: number;\n numSignerAccounts?: number;\n };\n const numRequiredSignatures = header.numRequiredSignatures ?? header.numSignerAccounts;\n if (\n typeof numRequiredSignatures === \"number\" &&\n numRequiredSignatures > MAX_REQUIRED_SIGNATURES\n ) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_excessive_signers\",\n payer: \"\",\n };\n }\n\n // Allow 3-6 instructions:\n // - 3 instructions: ComputeLimit + ComputePrice + TransferChecked\n // - 4 instructions: ComputeLimit + ComputePrice + TransferChecked + Lighthouse or Memo\n // - 5 instructions: ComputeLimit + ComputePrice + TransferChecked + Lighthouse + Lighthouse or Memo\n // - 6 instructions: ComputeLimit + ComputePrice + TransferChecked + Lighthouse + Lighthouse + Memo\n // See: https://github.com/x402-foundation/x402/issues/828\n if (instructions.length < 3 || instructions.length > 6) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_transaction_instructions_length\",\n payer: \"\",\n };\n }\n\n // Step 3: Verify Compute Budget Instructions\n try {\n this.verifyComputeLimitInstruction(instructions[0] as never);\n this.verifyComputePriceInstruction(instructions[1] as never);\n } catch (error) {\n const errorMessage = error instanceof Error ? error.message : String(error);\n return {\n isValid: false,\n invalidReason: errorMessage,\n payer: \"\",\n };\n }\n\n const payer = getTokenPayerFromTransaction(transaction);\n if (!payer) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_no_transfer_instruction\",\n payer: \"\",\n };\n }\n\n // Step 4: Verify Transfer Instruction\n const transferIx = instructions[2];\n const programAddress = transferIx.programAddress.toString();\n\n if (\n programAddress !== TOKEN_PROGRAM_ADDRESS.toString() &&\n programAddress !== TOKEN_2022_PROGRAM_ADDRESS.toString()\n ) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_no_transfer_instruction\",\n payer,\n };\n }\n\n // Parse the transfer instruction using the appropriate library helper\n let parsedTransfer;\n try {\n if (programAddress === TOKEN_PROGRAM_ADDRESS.toString()) {\n parsedTransfer = parseTransferCheckedInstructionToken(transferIx as never);\n } else {\n parsedTransfer = parseTransferCheckedInstruction2022(transferIx as never);\n }\n } catch {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_no_transfer_instruction\",\n payer,\n };\n }\n\n // Verify that the facilitator's signers are not transferring their own funds\n // SECURITY: Prevent facilitator from signing away their own tokens\n const authorityAddress = parsedTransfer.accounts.authority.address.toString();\n if (signerAddresses.includes(authorityAddress)) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_transaction_fee_payer_transferring_funds\",\n payer,\n };\n }\n\n // Verify mint address matches requirements\n const mintAddress = parsedTransfer.accounts.mint.address.toString();\n if (mintAddress !== requirements.asset) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_mint_mismatch\",\n payer,\n };\n }\n\n // Verify destination ATA matches expected ATA for payTo address\n const destATA = parsedTransfer.accounts.destination.address.toString();\n try {\n const [expectedDestATA] = await findAssociatedTokenPda({\n mint: requirements.asset as Address,\n owner: requirements.payTo as Address,\n tokenProgram:\n programAddress === TOKEN_PROGRAM_ADDRESS.toString()\n ? (TOKEN_PROGRAM_ADDRESS as Address)\n : (TOKEN_2022_PROGRAM_ADDRESS as Address),\n });\n\n if (destATA !== expectedDestATA.toString()) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_recipient_mismatch\",\n payer,\n };\n }\n } catch {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_recipient_mismatch\",\n payer,\n };\n }\n\n // Verify transfer amount exactly matches requirements\n const amount = parsedTransfer.data.amount;\n if (amount !== BigInt(requirementsV1.maxAmountRequired)) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_amount_mismatch\",\n payer,\n };\n }\n\n // Step 5: Verify optional instructions (if present)\n // Allowed optional programs: Lighthouse (wallet protection) and Memo (uniqueness)\n const optionalInstructions = instructions.slice(3);\n const invalidReasonByIndex = [\n \"invalid_exact_svm_payload_unknown_fourth_instruction\",\n \"invalid_exact_svm_payload_unknown_fifth_instruction\",\n \"invalid_exact_svm_payload_unknown_sixth_instruction\",\n ];\n\n for (let i = 0; i < optionalInstructions.length; i += 1) {\n const programAddress = optionalInstructions[i].programAddress.toString();\n if (\n programAddress === LIGHTHOUSE_PROGRAM_ADDRESS ||\n programAddress === MEMO_PROGRAM_ADDRESS\n ) {\n continue;\n }\n\n return {\n isValid: false,\n invalidReason:\n invalidReasonByIndex[i] ?? \"invalid_exact_svm_payload_unknown_optional_instruction\",\n payer,\n };\n }\n\n // Step 5b: Verify memo content matches extra.memo when present\n const expectedMemo = requirementsV1.extra?.memo as string | undefined;\n if (expectedMemo) {\n const memoInstructions = optionalInstructions.filter(\n ix => ix.programAddress.toString() === MEMO_PROGRAM_ADDRESS,\n );\n if (memoInstructions.length !== 1) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_memo_count\",\n payer,\n };\n }\n const memoData = memoInstructions[0].data;\n const actualMemo = memoData ? new TextDecoder().decode(new Uint8Array(memoData)) : \"\";\n if (actualMemo !== expectedMemo) {\n return {\n isValid: false,\n invalidReason: \"invalid_exact_svm_payload_memo_mismatch\",\n payer,\n };\n }\n }\n\n // Step 6: Sign and Simulate Transaction\n // CRITICAL: Simulation proves transaction will succeed (catches insufficient balance, invalid accounts, etc)\n try {\n const feePayer = requirementsV1.extra.feePayer as Address;\n\n // Sign transaction with the feePayer's signer\n const fullySignedTransaction = await this.signer.signTransaction(\n exactSvmPayload.transaction,\n feePayer,\n requirements.network,\n );\n\n // Simulate to verify transaction would succeed\n await this.signer.simulateTransaction(fullySignedTransaction, requirements.network);\n } catch (error) {\n const errorMessage = error instanceof Error ? error.message : String(error);\n return {\n isValid: false,\n invalidReason: \"transaction_simulation_failed\",\n invalidMessage: errorMessage,\n payer,\n };\n }\n\n return {\n isValid: true,\n invalidReason: undefined,\n payer,\n };\n }\n\n /**\n * Settles a payment by submitting the transaction (V1).\n * Ensures the correct signer is used based on the feePayer specified in requirements.\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 payloadV1 = payload as unknown as PaymentPayloadV1;\n const exactSvmPayload = payload.payload as ExactSvmPayloadV1;\n\n const valid = await this.verify(payload, requirements);\n if (!valid.isValid) {\n return {\n success: false,\n network: payloadV1.network,\n transaction: \"\",\n errorReason: valid.invalidReason ?? \"verification_failed\",\n errorMessage: valid.invalidMessage,\n payer: valid.payer || \"\",\n };\n }\n\n // Decode the transaction to compute the message hash used as the cache key.\n // Must remain synchronous (before any await) so concurrent settle calls for\n // the same payment are caught before any async work begins.\n const decodedTx = decodeTransactionFromPayload(exactSvmPayload);\n\n // Duplicate settlement check keyed on message hash (immune to mutable fee-payer sig at slot 0).\n const txKey = transactionMessageHash(decodedTx);\n if (this.settlementCache.isDuplicate(txKey)) {\n return {\n success: false,\n network: payloadV1.network,\n transaction: \"\",\n errorReason: \"duplicate_settlement\",\n payer: valid.payer || \"\",\n };\n }\n\n try {\n // Extract feePayer from requirements (already validated in verify)\n const feePayer = requirements.extra.feePayer as Address;\n\n // Sign transaction with the feePayer's signer\n const fullySignedTransaction = await this.signer.signTransaction(\n exactSvmPayload.transaction,\n feePayer,\n requirements.network,\n );\n\n // Send transaction to network\n const signature = await this.signer.sendTransaction(\n fullySignedTransaction,\n requirements.network,\n );\n\n // Wait for confirmation\n await this.signer.confirmTransaction(signature, requirements.network);\n\n return {\n success: true,\n transaction: signature,\n network: payloadV1.network,\n payer: valid.payer,\n };\n } catch (error) {\n console.error(\"Failed to settle transaction:\", error);\n return {\n success: false,\n errorReason: \"transaction_failed\",\n errorMessage: error instanceof Error ? error.message : String(error),\n transaction: \"\",\n network: payloadV1.network,\n payer: valid.payer || \"\",\n };\n }\n }\n\n /**\n * Verify compute limit instruction\n *\n * @param instruction - The compute limit instruction\n * @param instruction.programAddress - Program address\n * @param instruction.data - Instruction data bytes\n */\n private verifyComputeLimitInstruction(instruction: {\n programAddress: Address;\n data?: Readonly;\n }): void {\n const programAddress = instruction.programAddress.toString();\n\n if (\n programAddress !== COMPUTE_BUDGET_PROGRAM_ADDRESS.toString() ||\n !instruction.data ||\n instruction.data[0] !== 2\n ) {\n throw new Error(\n \"invalid_exact_svm_payload_transaction_instructions_compute_limit_instruction\",\n );\n }\n\n try {\n const parsedInstruction = parseSetComputeUnitLimitInstruction(instruction as never);\n\n // Security: Enforce compute unit limit upper bound to prevent gas amplification attacks.\n // Note: parsed instruction shape is { programAddress, data: { discriminator, units } }.\n const units = parsedInstruction.data.units;\n if (units > MAX_COMPUTE_UNIT_LIMIT) {\n throw new Error(\"invalid_exact_svm_payload_transaction_compute_limit_too_high\");\n }\n } catch (error) {\n if (error instanceof Error && error.message.includes(\"too_high\")) {\n throw error;\n }\n throw new Error(\n \"invalid_exact_svm_payload_transaction_instructions_compute_limit_instruction\",\n );\n }\n }\n\n /**\n * Verify compute price instruction\n *\n * @param instruction - The compute price instruction\n * @param instruction.programAddress - Program address\n * @param instruction.data - Instruction data bytes\n */\n private verifyComputePriceInstruction(instruction: {\n programAddress: Address;\n data?: Readonly;\n }): void {\n const programAddress = instruction.programAddress.toString();\n\n if (\n programAddress !== COMPUTE_BUDGET_PROGRAM_ADDRESS.toString() ||\n !instruction.data ||\n instruction.data[0] !== 3\n ) {\n throw new Error(\n \"invalid_exact_svm_payload_transaction_instructions_compute_price_instruction\",\n );\n }\n\n try {\n const parsedInstruction = parseSetComputeUnitPriceInstruction(instruction as never);\n\n // Check if price exceeds maximum (5 lamports per compute unit)\n const microLamports = parsedInstruction.data.microLamports;\n if (microLamports > BigInt(MAX_COMPUTE_UNIT_PRICE_MICROLAMPORTS)) {\n throw new Error(\n \"invalid_exact_svm_payload_transaction_instructions_compute_price_instruction_too_high\",\n );\n }\n } catch (error) {\n if (error instanceof Error && error.message.includes(\"too_high\")) {\n throw error;\n }\n throw new Error(\n \"invalid_exact_svm_payload_transaction_instructions_compute_price_instruction\",\n );\n }\n 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