# All files / lib/messages DlcSign.ts

79.46% Statements 89/112
35.42% Branches 17/48
80% Functions 16/20
79.28% Lines 88/111

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     import { BufferReader, BufferWriter } from '@node-dlc/bufio';
    import secp256k1 from 'secp256k1';

    import { MessageType, PROTOCOL_VERSION } from '../MessageType';
    import { deserializeTlv } from '../serialize/deserializeTlv';
    import { getTlv } from '../serialize/getTlv';
    import { BatchFundingGroup } from './BatchFundingGroup';
    import {
      CetAdaptorSignatures,
      ICetAdaptorSignaturesJSON,
    } from './CetAdaptorSignatures';
    import { IDlcMessage } from './DlcMessage';
    import { FundingSignatures, IFundingSignaturesJSON } from './FundingSignatures';
    import { ScriptWitnessV0 } from './ScriptWitnessV0';

    /**
     * DlcSign gives all of the initiator's signatures, which allows the
     * receiver to broadcast the funding transaction with both parties being
     * fully committed to all closing transactions.
     * Updated to support dlcspecs PR #163 format.
     */
    export class DlcSign implements IDlcMessage {
      public static type = MessageType.DlcSign;

      /**
       * Creates a DlcSign from JSON data (e.g., from test vectors)
       * Handles both our internal format and external test vector formats
       * @param json JSON object representing a DLC sign
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): DlcSign {
        const instance = new DlcSign();

        // Helper function to parse DER-encoded signature and extract raw r,s values (64 bytes total)
        const parseDerSignature = (hexSig: string): Buffer => {
          const sigBuffer = Buffer.from(hexSig, 'hex');

          // If it's already 64 bytes, assume it's raw
          Iif (sigBuffer.length === 64) {
            return sigBuffer;
          }

          // Use secp256k1.signatureImport to parse DER signature
          try {
            const rawSig = secp256k1.signatureImport(sigBuffer);
            return Buffer.from(rawSig);
          } catch (ex) {
            throw new Error(`Invalid DER signature: ${ex.message}`);
          }
        };

        // Handle both internal and external field naming conventions
        instance.protocolVersion =
          json.protocolVersion || json.protocol_version || PROTOCOL_VERSION;
        instance.contractId = Buffer.from(
          json.contractId || json.contract_id,
          'hex',
        );

        // Parse CET adaptor signatures
        instance.cetAdaptorSignatures = DlcSign.parseCetAdaptorSignaturesFromJSON(
          json.cetAdaptorSignatures || json.cet_adaptor_signatures,
        );

        // Parse refund signature - handle DER encoding
        const refundSigHex = json.refundSignature || json.refund_signature;
        instance.refundSignature = parseDerSignature(refundSigHex);

        // Parse funding signatures
        instance.fundingSignatures = DlcSign.parseFundingSignaturesFromJSON(
          json.fundingSignatures || json.funding_signatures,
        );

        return instance;
      }

      /**
       * Parses CetAdaptorSignatures from JSON
       * @param cetSigsJson JSON object representing CET adaptor signatures
       */
      private static parseCetAdaptorSignaturesFromJSON(
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        cetSigsJson: any,
      ): CetAdaptorSignatures {
        const instance = new CetAdaptorSignatures();

        Eif (
          cetSigsJson.ecdsaAdaptorSignatures ||
          cetSigsJson.ecdsa_adaptor_signatures
        ) {
          const ecdsaSigs =
            cetSigsJson.ecdsaAdaptorSignatures ||
            cetSigsJson.ecdsa_adaptor_signatures;
          // eslint-disable-next-line @typescript-eslint/no-explicit-any
          instance.sigs = ecdsaSigs.map((sig: any) => {
            // The test vectors use 'signature' field, but our internal format uses encryptedSig/dleqProof
            // For now, we'll parse the signature as encryptedSig and leave dleqProof empty
            const sigBuffer = Buffer.from(sig.signature, 'hex');
            return {
              encryptedSig: sigBuffer.slice(0, 65), // First 65 bytes
              dleqProof:
                sigBuffer.length > 65 ? sigBuffer.slice(65, 162) : Buffer.alloc(97), // Next 97 bytes or empty
            };
          });
        }

        return instance;
      }

      /**
       * Parses FundingSignatures from JSON
       * @param fundingSigsJson JSON object representing funding signatures
       */
      private static parseFundingSignaturesFromJSON(
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        fundingSigsJson: any,
      ): FundingSignatures {
        const instance = new FundingSignatures();

        Eif (
          fundingSigsJson.fundingSignatures ||
          fundingSigsJson.funding_signatures
        ) {
          const fundingSigs =
            fundingSigsJson.fundingSignatures || fundingSigsJson.funding_signatures;
          // eslint-disable-next-line @typescript-eslint/no-explicit-any
          instance.witnessElements = fundingSigs.map((sig: any) =>
            (sig.witnessElements || sig.witness_elements || []).map(
              // eslint-disable-next-line @typescript-eslint/no-explicit-any
              (element: any) => {
                // Create a ScriptWitnessV0 instance for each witness element
                const witness = new ScriptWitnessV0();
                witness.witness = Buffer.from(element.witness || element, 'hex');
                return witness;
              },
            ),
          );
        }

        return instance;
      }

      /**
       * Deserializes a sign_dlc message
       * @param buf
       */
      public static deserialize(buf: Buffer): DlcSign {
        const instance = new DlcSign();
        const reader = new BufferReader(buf);

        reader.readUInt16BE(); // read type

        // New fields as per dlcspecs PR #163
        instance.protocolVersion = reader.readUInt32BE();
        instance.contractId = reader.readBytes(32);

        // Read CET adaptor signatures directly to match serialize format (no TLV wrapping)
        instance.cetAdaptorSignatures = CetAdaptorSignatures.deserialize(
          reader.buffer.subarray(reader.position),
        );

        // Skip past the CET adaptor signatures we just read
        const cetLength = instance.cetAdaptorSignatures.serialize().length;
        reader.position += cetLength;

        instance.refundSignature = reader.readBytes(64);

        // Read funding signatures directly to match serialize format (no TLV wrapping)
        instance.fundingSignatures = FundingSignatures.deserialize(
          reader.buffer.subarray(reader.position),
        );

        // Skip past the funding signatures we just read
        const fundingLength = instance.fundingSignatures.serialize().length;
        reader.position += fundingLength;

        // Parse TLV stream as per dlcspecs PR #163
        while (!reader.eof) {
          const buf = getTlv(reader);
          const tlvReader = new BufferReader(buf);
          const { type } = deserializeTlv(tlvReader);

          switch (Number(type)) {
            case MessageType.BatchFundingGroup:
              if (!instance.batchFundingGroups) {
                instance.batchFundingGroups = [];
              }
              instance.batchFundingGroups.push(BatchFundingGroup.deserialize(buf));
              break;
            default:
              // Store unknown TLVs for future compatibility
              if (!instance.unknownTlvs) {
                instance.unknownTlvs = [];
              }
              instance.unknownTlvs.push({ type: Number(type), data: buf });
              break;
          }
        }

        return instance;
      }

      /**
       * The type for sign_dlc message. sign_dlc = 42782
       */
      public type = DlcSign.type;

      // New fields as per dlcspecs PR #163
      public protocolVersion: number = PROTOCOL_VERSION; // Default to current protocol version

      // Existing fields
      public contractId: Buffer;

      public cetAdaptorSignatures: CetAdaptorSignatures;

      public refundSignature: Buffer;

      public fundingSignatures: FundingSignatures;

      public batchFundingGroups?: BatchFundingGroup[];

      // Store unknown TLVs for forward compatibility
      public unknownTlvs?: Array<{ type: number; data: Buffer }>;

      /**
       * Validates correctness of all fields
       * Updated validation rules as per dlcspecs PR #163
       * @throws Will throw an error if validation fails
       */
      public validate(): void {
        // 1. Type is set automatically in class
        // 2. protocol_version validation
        if (this.protocolVersion !== PROTOCOL_VERSION) {
          throw new Error(
            `Unsupported protocol version: ${this.protocolVersion}, expected: ${PROTOCOL_VERSION}`,
          );
        }

        // 3. contract_id must be 32 bytes
        if (!this.contractId || this.contractId.length !== 32) {
          throw new Error('contractId must be 32 bytes');
        }

        // 4. Other validations would depend on specific business logic
        // TODO: Add more specific validation rules as needed
      }

      /**
       * Converts sign_dlc to JSON (canonical rust-dlc format)
       */
      public toJSON(): IDlcSignJSON {
        // Convert raw signature back to DER format for canonical rust-dlc JSON
        const derRefundSignature = secp256k1.signatureExport(this.refundSignature);

        return {
          protocolVersion: this.protocolVersion,
          contractId: this.contractId.toString('hex'),
          cetAdaptorSignatures: this.cetAdaptorSignatures.toJSON(),
          refundSignature: Buffer.from(derRefundSignature).toString('hex'),
          fundingSignatures: this.fundingSignatures.toJSON(),
        };
      }

      /**
       * Serializes the sign_dlc message into a Buffer
       * Updated serialization format as per dlcspecs PR #163
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeUInt16BE(this.type);

        // New fields as per dlcspecs PR #163
        writer.writeUInt32BE(this.protocolVersion);
        writer.writeBytes(this.contractId);
        writer.writeBytes(this.cetAdaptorSignatures.serialize());
        writer.writeBytes(this.refundSignature);
        writer.writeBytes(this.fundingSignatures.serialize());

        // TLV stream as per dlcspecs PR #163
        Iif (this.batchFundingGroups)
          this.batchFundingGroups.forEach((fundingInfo) =>
            writer.writeBytes(fundingInfo.serialize()),
          );

        // Write unknown TLVs for forward compatibility
        Iif (this.unknownTlvs) {
          this.unknownTlvs.forEach((tlv) => {
            writer.writeBytes(tlv.data);
          });
        }

        return writer.toBuffer();
      }
    }

    export interface IDlcSignJSON {
      protocolVersion: number;
      contractId: string;
      cetAdaptorSignatures: ICetAdaptorSignaturesJSON;
      refundSignature: string;
      fundingSignatures: IFundingSignaturesJSON;
    }

    export class DlcSignContainer {
      private signs: DlcSign[] = [];

      /**
       * Adds a DlcSign to the container.
       * @param sign The DlcSign to add.
       */
      public addSign(sign: DlcSign): void {
        this.signs.push(sign);
      }

      /**
       * Returns all DlcSigns in the container.
       * @returns An array of DlcSign instances.
       */
      public getSigns(): DlcSign[] {
        return this.signs;
      }

      /**
       * Serializes all DlcSigns in the container to a Buffer.
       * @returns A Buffer containing the serialized DlcSigns.
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        // Write the number of signs in the container first.
        writer.writeBigSize(this.signs.length);
        // Serialize each sign and write it.
        this.signs.forEach((sign) => {
          const serializedSign = sign.serialize();
          // Optionally, write the length of the serialized sign for easier deserialization.
          writer.writeBigSize(serializedSign.length);
          writer.writeBytes(serializedSign);
        });
        return writer.toBuffer();
      }

      /**
       * Deserializes a Buffer into a DlcSignContainer with DlcSigns.
       * @param buf The Buffer to deserialize.
       * @returns A DlcSignContainer instance.
       */
      public static deserialize(buf: Buffer): DlcSignContainer {
        const reader = new BufferReader(buf);
        const container = new DlcSignContainer();
        const signsCount = reader.readBigSize();
        for (let i = 0; i < signsCount; i++) {
          // Optionally, read the length of the serialized sign if it was written during serialization.
          const signLength = reader.readBigSize();
          const signBuf = reader.readBytes(Number(signLength));
          const sign = DlcSign.deserialize(signBuf);
          container.addSign(sign);
        }
        return container;
      }
    }