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axios from \"axios\";\nimport { ethers } from \"ethers\";\nimport { bls12_381 as bls } from \"@noble/curves/bls12-381.js\";\nimport {\n BLSConfig,\n BLSNode,\n BLSSignatureData,\n CumulativeT2SignatureData,\n CumulativeT3SignatureData,\n} from \"./types\";\n\nexport class BLSManager {\n private config: BLSConfig;\n\n constructor(config: BLSConfig) {\n this.config = config;\n }\n\n /**\n * Discover available BLS nodes from seed nodes (Gossip network)\n */\n async getAvailableNodes(): Promise {\n const { seedNodes, discoveryTimeout = 5000 } = this.config;\n\n for (const seedEndpoint of seedNodes) {\n try {\n // Try to get peers from gossip endpoint\n const response = await axios.get(`${seedEndpoint}/gossip/peers`, {\n timeout: discoveryTimeout,\n });\n\n const peers = response.data.peers || [];\n\n // Filter active nodes with proper structure\n const activeNodes: BLSNode[] = peers\n .filter((p: any) => p.status === \"active\" && p.apiEndpoint && p.publicKey)\n .map((p: any, index: number) => ({\n index: index + 1, // 1-based index likely expected by contract if using bitmap\n nodeId: p.nodeId,\n nodeName: p.nodeName,\n apiEndpoint: p.apiEndpoint,\n status: \"active\",\n publicKey: p.publicKey,\n }));\n\n if (activeNodes.length > 0) {\n return activeNodes;\n }\n } catch {\n // Try next seed node\n continue;\n }\n }\n\n return [];\n }\n\n /**\n * Helper to pack the full signature for ERC-4337 UserOp\n * Format: [nodeIdsLength][nodeIds...][blsSignature][messagePoint][aaSignature][messagePointSignature]\n */\n packSignature(data: BLSSignatureData): string {\n if (!data.nodeIds || !data.aaSignature || !data.messagePointSignature) {\n throw new Error(\"Missing required signature components\");\n }\n\n const nodeIdsLength = ethers.solidityPacked([\"uint256\"], [data.nodeIds.length]);\n const nodeIdsBytes = ethers.solidityPacked(\n Array(data.nodeIds.length).fill(\"bytes32\"),\n data.nodeIds\n );\n\n return ethers.solidityPacked(\n [\"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\"],\n [\n nodeIdsLength,\n nodeIdsBytes,\n data.signature,\n data.messagePoint,\n data.aaSignature,\n data.messagePointSignature,\n ]\n );\n }\n\n /**\n * Calculate the MessagePoint G2 point for a given message (UserOpHash)\n */\n async generateMessagePoint(message: string | Uint8Array): Promise {\n const messageBytes = typeof message === \"string\" ? ethers.getBytes(message) : message;\n const DST = \"BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_POP_\";\n\n const messagePointBLS = await bls.G2.hashToCurve(messageBytes, { DST });\n const messageG2EIP = this.encodeG2Point(messagePointBLS);\n\n return \"0x\" + Buffer.from(messageG2EIP).toString(\"hex\");\n }\n\n /**\n * Encode G2 Point to bytes for EIP-2537 format\n */\n private encodeG2Point(point: any): Uint8Array {\n const result = new Uint8Array(256);\n const affine = point.toAffine();\n\n const x0Bytes = this.hexToBytes(affine.x.c0.toString(16).padStart(96, \"0\"));\n const x1Bytes = this.hexToBytes(affine.x.c1.toString(16).padStart(96, \"0\"));\n const y0Bytes = this.hexToBytes(affine.y.c0.toString(16).padStart(96, \"0\"));\n const y1Bytes = this.hexToBytes(affine.y.c1.toString(16).padStart(96, \"0\"));\n\n result.set(x0Bytes, 16);\n result.set(x1Bytes, 80);\n result.set(y0Bytes, 144);\n result.set(y1Bytes, 208);\n return result;\n }\n\n private hexToBytes(hex: string): Uint8Array {\n if (hex.startsWith(\"0x\")) hex = hex.slice(2);\n const bytes = new Uint8Array(hex.length / 2);\n for (let i = 0; i < hex.length; i += 2) {\n bytes[i / 2] = parseInt(hex.substr(i, 2), 16);\n }\n return bytes;\n }\n\n /**\n * Pack cumulative Tier 2 signature (algId 0x04): P256 + BLS.\n *\n * Format:\n * [algId=0x04 (1)] [P256 r (32)] [P256 s (32)]\n * [nodeIdsLength (32)] [nodeIds (N×32)]\n * [blsAggregateSig (256)] [messagePoint (256)]\n * [messagePointECDSA (65)]\n */\n packCumulativeT2Signature(data: CumulativeT2SignatureData): string {\n const nodeIdsLength = ethers.solidityPacked([\"uint256\"], [data.nodeIds.length]);\n const nodeIdsBytes = ethers.solidityPacked(\n Array(data.nodeIds.length).fill(\"bytes32\"),\n data.nodeIds\n );\n\n return ethers.solidityPacked(\n [\"bytes1\", \"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\"],\n [\n \"0x04\",\n data.p256Signature,\n nodeIdsLength,\n nodeIdsBytes,\n data.blsSignature,\n data.messagePoint,\n data.messagePointSignature,\n ]\n );\n }\n\n /**\n * Pack cumulative Tier 3 signature (algId 0x05): P256 + BLS + Guardian.\n *\n * Format:\n * [algId=0x05 (1)] [P256 r (32)] [P256 s (32)]\n * [nodeIdsLength (32)] [nodeIds (N×32)]\n * [blsAggregateSig (256)] [messagePoint (256)]\n * [messagePointECDSA (65)] [guardianECDSA (65)]\n */\n packCumulativeT3Signature(data: CumulativeT3SignatureData): string {\n const nodeIdsLength = ethers.solidityPacked([\"uint256\"], [data.nodeIds.length]);\n const nodeIdsBytes = ethers.solidityPacked(\n Array(data.nodeIds.length).fill(\"bytes32\"),\n data.nodeIds\n );\n\n return ethers.solidityPacked(\n [\"bytes1\", \"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\", \"bytes\"],\n [\n \"0x05\",\n data.p256Signature,\n nodeIdsLength,\n nodeIdsBytes,\n data.blsSignature,\n data.messagePoint,\n data.messagePointSignature,\n data.guardianSignature,\n ]\n );\n }\n\n /**\n * Request signature from a single node\n */\n async requestNodeSignature(\n node: BLSNode,\n message: string\n ): Promise<{ signature: string; publicKey: string }> {\n const response = await axios.post(`${node.apiEndpoint}/signature/sign`, {\n message,\n });\n\n const signatureEIP = response.data.signature;\n // Prefer compact if available, logic copied from legacy service\n const signature = response.data.signatureCompact || signatureEIP;\n\n return {\n signature: signature.startsWith(\"0x\") ? signature : `0x${signature}`,\n publicKey: response.data.publicKey,\n };\n }\n\n /**\n * Request aggregation from a node\n */\n async aggregateSignatures(node: BLSNode, signatures: string[]): Promise {\n const response = await axios.post(`${node.apiEndpoint}/signature/aggregate`, {\n signatures,\n });\n\n const sig = response.data.signature;\n return sig.startsWith(\"0x\") ? sig : `0x${sig}`;\n }\n}\n"]}