{"version":3,"sources":["../../src/eip2612-gas-sponsoring/server.ts","../../src/eip2612-gas-sponsoring/client.ts","../../src/eip2612-gas-sponsoring/facilitator.ts"],"sourcesContent":["/**\n * EIP-2612 Gas Sponsoring Extension Server-Side Implementation\n *\n * Provides functions for servers to declare gas sponsoring requirements,\n * parse client headers, and validate permit payloads.\n */\n\nimport type {\n Eip2612GasSponsorExtension,\n Eip2612GasSponsorExtensionInfo,\n Eip2612GasSponsorPayload,\n DeclareEip2612GasSponsorOptions,\n ValidateEip2612GasSponsorOptions,\n Eip2612GasSponsorValidationResult,\n} from \"./types.js\";\n\n/**\n * JSON Schema for EIP-2612 gas sponsor payload validation.\n */\nconst EIP2612_GAS_SPONSOR_SCHEMA = {\n type: \"object\",\n required: [\"network\", \"permitSignature\", \"owner\", \"spender\", \"value\", \"deadline\", \"v\", \"r\", \"s\"],\n properties: {\n network: { type: \"string\" },\n permitSignature: { type: \"string\" },\n owner: { type: \"string\" },\n spender: { type: \"string\" },\n value: { type: \"string\" },\n deadline: { type: \"number\" },\n v: { type: \"number\" },\n r: { type: \"string\" },\n s: { type: \"string\" },\n },\n};\n\n/**\n * Declares an EIP-2612 gas sponsor extension for server responses.\n *\n * @param options - Extension declaration options\n * @returns Gas sponsor extension object ready for response\n *\n * @example\n * ```typescript\n * const extension = declareEip2612GasSponsorExtension({\n * sponsoredNetworks: [\"eip155:8453\", \"eip155:42161\"],\n * maxAmount: \"1000000000\",\n * sponsorAddress: \"0xFacilitator...\",\n * });\n * ```\n */\nexport function declareEip2612GasSponsorExtension(\n options: DeclareEip2612GasSponsorOptions,\n): Eip2612GasSponsorExtension {\n const info: Eip2612GasSponsorExtensionInfo = {\n sponsoredNetworks: options.sponsoredNetworks,\n maxAmount: options.maxAmount,\n permitDeadline: options.permitDeadline ?? 300,\n sponsorAddress: options.sponsorAddress,\n };\n\n return {\n info,\n schema: EIP2612_GAS_SPONSOR_SCHEMA,\n };\n}\n\n/**\n * Parses an EIP-2612 gas sponsor header from client request.\n *\n * The header format is base64-encoded JSON.\n *\n * @param header - Base64-encoded gas sponsor header value\n * @returns Parsed gas sponsor payload\n * @throws Error if header is invalid\n *\n * @example\n * ```typescript\n * const payload = parseEip2612GasSponsorHeader(\n * request.headers['x-t402-eip2612-gas-sponsoring']\n * );\n * ```\n */\nexport function parseEip2612GasSponsorHeader(header: string): Eip2612GasSponsorPayload {\n if (!header) {\n throw new Error(\"Missing EIP-2612 gas sponsor header\");\n }\n\n try {\n const decoded = Buffer.from(header, \"base64\").toString(\"utf-8\");\n const payload = JSON.parse(decoded) as Eip2612GasSponsorPayload;\n\n const required = [\n \"network\",\n \"permitSignature\",\n \"owner\",\n \"spender\",\n \"value\",\n \"deadline\",\n \"v\",\n \"r\",\n \"s\",\n ];\n for (const field of required) {\n if (!(field in payload)) {\n throw new Error(`Missing required field: ${field}`);\n }\n }\n\n return payload;\n } catch (error) {\n if (error instanceof SyntaxError) {\n throw new Error(\"Invalid EIP-2612 gas sponsor header: malformed JSON\");\n }\n throw error;\n }\n}\n\n/**\n * Validates an EIP-2612 gas sponsor payload against server extension info.\n *\n * @param payload - The gas sponsor payload from the client\n * @param extensionInfo - The server's gas sponsor extension info\n * @param options - Validation options\n * @returns Validation result\n *\n * @example\n * ```typescript\n * const result = validateEip2612GasSponsorPayload(payload, extension.info);\n * if (!result.valid) {\n * throw new Error(result.error);\n * }\n * ```\n */\nexport function validateEip2612GasSponsorPayload(\n payload: Eip2612GasSponsorPayload,\n extensionInfo: Eip2612GasSponsorExtensionInfo,\n options: ValidateEip2612GasSponsorOptions = {},\n): Eip2612GasSponsorValidationResult {\n const now = options.now ? options.now() : Date.now();\n const nowSeconds = Math.floor(now / 1000);\n\n // Validate network is in sponsoredNetworks\n if (!extensionInfo.sponsoredNetworks.includes(payload.network)) {\n return {\n valid: false,\n error: `Network ${payload.network} is not in sponsored networks: ${extensionInfo.sponsoredNetworks.join(\", \")}`,\n };\n }\n\n // Validate amount does not exceed maxAmount\n const payloadValue = BigInt(payload.value);\n const maxAmount = BigInt(extensionInfo.maxAmount);\n if (payloadValue > maxAmount) {\n return {\n valid: false,\n error: `Value ${payload.value} exceeds maximum amount ${extensionInfo.maxAmount}`,\n };\n }\n\n // Validate deadline is in the future\n if (payload.deadline <= nowSeconds) {\n return {\n valid: false,\n error: \"Permit deadline has expired\",\n };\n }\n\n // Validate deadline does not exceed permitDeadline seconds from now\n const maxDeadline = nowSeconds + extensionInfo.permitDeadline;\n if (payload.deadline > maxDeadline) {\n return {\n valid: false,\n error: `Permit deadline ${payload.deadline} exceeds maximum allowed deadline ${maxDeadline}`,\n };\n }\n\n // Validate spender matches sponsorAddress\n if (payload.spender.toLowerCase() !== extensionInfo.sponsorAddress.toLowerCase()) {\n return {\n valid: false,\n error: `Spender ${payload.spender} does not match sponsor address ${extensionInfo.sponsorAddress}`,\n };\n }\n\n // Validate permitSignature format (65 bytes = 130 hex chars)\n const sigHex = payload.permitSignature.startsWith(\"0x\")\n ? payload.permitSignature.slice(2)\n : payload.permitSignature;\n if (sigHex.length !== 130) {\n return {\n valid: false,\n error: `Invalid permit signature length: expected 130 hex chars, got ${sigHex.length}`,\n };\n }\n\n // Validate v is 27 or 28\n if (payload.v !== 27 && payload.v !== 28) {\n return {\n valid: false,\n error: `Invalid v value: expected 27 or 28, got ${payload.v}`,\n };\n }\n\n // Validate r format (32 bytes = 64 hex chars)\n const rHex = payload.r.startsWith(\"0x\") ? payload.r.slice(2) : payload.r;\n if (rHex.length !== 64) {\n return {\n valid: false,\n error: `Invalid r length: expected 64 hex chars, got ${rHex.length}`,\n };\n }\n\n // Validate s format (32 bytes = 64 hex chars)\n const sHex = payload.s.startsWith(\"0x\") ? payload.s.slice(2) : payload.s;\n if (sHex.length !== 64) {\n return {\n valid: false,\n error: `Invalid s length: expected 64 hex chars, got ${sHex.length}`,\n };\n }\n\n return { valid: true };\n}\n","/**\n * EIP-2612 Gas Sponsoring Extension Client-Side Implementation\n *\n * Provides functions for clients to create EIP-2612 permit signatures\n * and encode gas sponsor payloads for transmission.\n */\n\nimport type { Eip2612GasSponsorPayload, CreatePermitParams } from \"./types.js\";\n\n/**\n * Extension key for EIP-2612 gas sponsoring in payment requirements.\n */\nexport const EIP2612_GAS_SPONSOR_EXTENSION_KEY = \"eip2612GasSponsoring\";\n\n/**\n * HTTP header name for EIP-2612 gas sponsor payload.\n */\nexport const EIP2612_GAS_SPONSOR_HEADER_NAME = \"X-T402-EIP2612-Gas-Sponsoring\";\n\n/**\n * Creates an EIP-2612 permit signature using EIP-712 typed data signing.\n *\n * @param params - Permit signing parameters\n * @returns Permit data including the signature components\n *\n * @example\n * ```typescript\n * const permit = await createPermitSignature({\n * signer: wallet,\n * tokenAddress: \"0xUSDT...\",\n * tokenName: \"Tether USD\",\n * chainId: 8453,\n * spender: facilitatorAddress,\n * value: \"1000000\",\n * deadline: Math.floor(Date.now() / 1000) + 300,\n * });\n * ```\n */\nexport async function createPermitSignature(params: CreatePermitParams): Promise<{\n owner: string;\n spender: string;\n value: string;\n deadline: number;\n v: number;\n r: string;\n s: string;\n permitSignature: string;\n}> {\n const { signer, tokenAddress, tokenName, chainId, spender, value, deadline, nonce = 0 } = params;\n\n const domain = {\n name: tokenName,\n version: \"1\",\n chainId,\n verifyingContract: tokenAddress,\n };\n\n const types = {\n Permit: [\n { name: \"owner\", type: \"address\" },\n { name: \"spender\", type: \"address\" },\n { name: \"value\", type: \"uint256\" },\n { name: \"nonce\", type: \"uint256\" },\n { name: \"deadline\", type: \"uint256\" },\n ],\n };\n\n const message = {\n owner: signer.address,\n spender,\n value,\n nonce,\n deadline,\n };\n\n const signature = await signer.signTypedData({\n domain,\n types,\n primaryType: \"Permit\",\n message,\n });\n\n // Parse signature into components\n const sigHex = signature.startsWith(\"0x\") ? signature.slice(2) : signature;\n\n if (sigHex.length !== 130) {\n throw new Error(`Invalid signature length: expected 130 hex chars, got ${sigHex.length}`);\n }\n\n const r = \"0x\" + sigHex.slice(0, 64);\n const s = \"0x\" + sigHex.slice(64, 128);\n let v = parseInt(sigHex.slice(128, 130), 16);\n\n // Normalize v to 27 or 28\n if (v < 27) {\n v += 27;\n }\n\n return {\n owner: signer.address,\n spender,\n value,\n deadline,\n v,\n r,\n s,\n permitSignature: signature.startsWith(\"0x\") ? signature : \"0x\" + signature,\n };\n}\n\n/**\n * Creates a gas sponsor payload from permit data and network.\n *\n * @param permit - Permit signature data from createPermitSignature\n * @param permit.owner - Token owner address\n * @param permit.spender - Approved spender address\n * @param permit.value - Token amount in base units\n * @param permit.deadline - Unix timestamp for permit expiry\n * @param permit.v - Recovery parameter from signature\n * @param permit.r - Signature r component (32 bytes hex)\n * @param permit.s - Signature s component (32 bytes hex)\n * @param permit.permitSignature - Full hex-encoded permit signature\n * @param network - CAIP-2 network identifier (e.g., \"eip155:8453\")\n * @returns Gas sponsor payload ready for header encoding\n *\n * @example\n * ```typescript\n * const payload = createEip2612GasSponsorPayload(permit, \"eip155:8453\");\n * ```\n */\nexport function createEip2612GasSponsorPayload(\n permit: {\n owner: string;\n spender: string;\n value: string;\n deadline: number;\n v: number;\n r: string;\n s: string;\n permitSignature: string;\n },\n network: string,\n): Eip2612GasSponsorPayload {\n return {\n network,\n permitSignature: permit.permitSignature,\n owner: permit.owner,\n spender: permit.spender,\n value: permit.value,\n deadline: permit.deadline,\n v: permit.v,\n r: permit.r,\n s: permit.s,\n };\n}\n\n/**\n * Encodes a gas sponsor payload for transmission in HTTP header.\n *\n * @param payload - The gas sponsor payload to encode\n * @returns Base64-encoded JSON string\n *\n * @example\n * ```typescript\n * const header = encodeEip2612GasSponsorHeader(payload);\n * fetch(url, {\n * headers: { [EIP2612_GAS_SPONSOR_HEADER_NAME]: header }\n * });\n * ```\n */\nexport function encodeEip2612GasSponsorHeader(payload: Eip2612GasSponsorPayload): string {\n const json = JSON.stringify(payload);\n if (typeof Buffer !== \"undefined\") {\n return Buffer.from(json, \"utf-8\").toString(\"base64\");\n }\n return btoa(json);\n}\n","/**\n * EIP-2612 Gas Sponsoring Extension Facilitator-Side Implementation\n *\n * Provides functions for facilitators to extract permit data from payment\n * extensions, validate permits, and prepare on-chain submission.\n */\n\nimport type {\n Eip2612GasSponsorPayload,\n Eip2612GasSponsorExtensionInfo,\n Eip2612GasSponsorValidationResult,\n} from \"./types.js\";\nimport { EIP2612_GAS_SPONSOR_EXTENSION_KEY } from \"./client.js\";\nimport { validateEip2612GasSponsorPayload } from \"./server.js\";\n\n/**\n * Extracts the EIP-2612 gas sponsor payload from payment extensions.\n *\n * @param extensions - The extensions map from a PaymentPayload\n * @returns The gas sponsor payload if present, or null\n *\n * @example\n * ```typescript\n * const permit = extractEip2612GasSponsorPayload(paymentPayload.extensions);\n * if (permit) {\n * // Submit permit tx then settle via Permit2\n * }\n * ```\n */\nexport function extractEip2612GasSponsorPayload(\n extensions: Record | undefined,\n): Eip2612GasSponsorPayload | null {\n if (!extensions) {\n return null;\n }\n\n const raw = extensions[EIP2612_GAS_SPONSOR_EXTENSION_KEY];\n if (!raw || typeof raw !== \"object\") {\n return null;\n }\n\n const payload = raw as Record;\n\n // Validate required fields are present\n const required = [\n \"network\",\n \"permitSignature\",\n \"owner\",\n \"spender\",\n \"value\",\n \"deadline\",\n \"v\",\n \"r\",\n \"s\",\n ];\n for (const field of required) {\n if (!(field in payload)) {\n return null;\n }\n }\n\n return {\n network: payload.network as string,\n permitSignature: payload.permitSignature as string,\n owner: payload.owner as string,\n spender: payload.spender as string,\n value: payload.value as string,\n deadline: payload.deadline as number,\n v: payload.v as number,\n r: payload.r as string,\n s: payload.s as string,\n };\n}\n\n/**\n * Validates and extracts the EIP-2612 gas sponsor payload in one step.\n *\n * This is a convenience function for facilitators that combines extraction\n * and validation against the server's extension info.\n *\n * @param extensions - The extensions map from a PaymentPayload\n * @param extensionInfo - The server's gas sponsor extension info\n * @returns Validation result with the extracted payload if valid\n *\n * @example\n * ```typescript\n * const result = validateAndExtractPermit(\n * paymentPayload.extensions,\n * extensionInfo\n * );\n * if (result.valid && result.payload) {\n * // Submit permit() on token contract, then settle via Permit2\n * }\n * ```\n */\nexport function validateAndExtractPermit(\n extensions: Record | undefined,\n extensionInfo: Eip2612GasSponsorExtensionInfo,\n): Eip2612GasSponsorValidationResult & { payload?: Eip2612GasSponsorPayload } {\n const payload = extractEip2612GasSponsorPayload(extensions);\n\n if (!payload) {\n return {\n valid: false,\n error: `Missing or invalid ${EIP2612_GAS_SPONSOR_EXTENSION_KEY} extension in payment`,\n };\n }\n\n const result = validateEip2612GasSponsorPayload(payload, extensionInfo);\n\n if (!result.valid) {\n return result;\n }\n\n return { valid: true, payload };\n}\n\n/**\n * Builds the EIP-2612 permit function call data for on-chain submission.\n *\n * Returns the ABI-encoded parameters needed to call `permit(owner, spender, value, deadline, v, r, s)`\n * on the token contract.\n *\n * @param payload - The validated gas sponsor payload\n * @returns Object with the permit call parameters\n *\n * @example\n * ```typescript\n * const permitCall = buildPermitCallData(payload);\n * // Use permitCall with your preferred web3 library to submit the tx\n * ```\n */\nexport function buildPermitCallData(payload: Eip2612GasSponsorPayload): {\n owner: string;\n spender: string;\n value: string;\n deadline: number;\n v: number;\n r: string;\n s: string;\n} {\n return {\n owner: payload.owner,\n spender: payload.spender,\n value: payload.value,\n deadline: payload.deadline,\n v: payload.v,\n r: payload.r,\n s: payload.s,\n 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