# All files / lib/messages DlcInput.ts

94.44% Statements 51/54
85% Branches 17/20
100% Functions 8/8
94.44% Lines 51/54

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

    import { MessageType } from '../MessageType';
    import { IDlcMessage } from './DlcMessage';

    /**
     * DlcInput contains information about a DLC input to be used in a funding transaction.
     * Contains the local and remote funding public keys and the contract ID of the DLC input.
     * Matches rust-dlc DlcInput struct.
     */
    export class DlcInput implements IDlcMessage {
      public static type = MessageType.DlcInput;

      /**
       * Creates a DlcInput from JSON data
       * @param json JSON object representing DLC input
       */
      // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-explicit-any
      public static fromJSON(json: any): DlcInput {
        const instance = new DlcInput();

        // Parse local funding public key
        const localFundPubkey = json.localFundPubkey || json.local_fund_pubkey;
        Eif (typeof localFundPubkey === 'string') {
          instance.localFundPubkey = Buffer.from(localFundPubkey, 'hex');
        } else {
          throw new Error('localFundPubkey is required');
        }

        // Parse remote funding public key
        const remoteFundPubkey = json.remoteFundPubkey || json.remote_fund_pubkey;
        Eif (typeof remoteFundPubkey === 'string') {
          instance.remoteFundPubkey = Buffer.from(remoteFundPubkey, 'hex');
        } else {
          throw new Error('remoteFundPubkey is required');
        }

        // Parse contract ID (32 bytes)
        const contractId = json.contractId || json.contract_id;
        Eif (typeof contractId === 'string') {
          instance.contractId = Buffer.from(contractId, 'hex');
        } else {
          throw new Error('contractId is required');
        }

        return instance;
      }

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

        reader.readBigSize(); // read type
        instance.length = reader.readBigSize();

        // Read local funding public key (33 bytes)
        instance.localFundPubkey = reader.readBytes(33);

        // Read remote funding public key (33 bytes)
        instance.remoteFundPubkey = reader.readBytes(33);

        // Read contract ID (32 bytes)
        instance.contractId = reader.readBytes(32);

        return instance;
      }

      /**
       * Deserializes a dlc_input without TLV wrapper (for use in FundingInput)
       * @param buf
       */
      public static deserializeBody(buf: Buffer): DlcInput {
        const instance = new DlcInput();
        const reader = new BufferReader(buf);

        // Read local funding public key (33 bytes)
        instance.localFundPubkey = reader.readBytes(33);

        // Read remote funding public key (33 bytes)
        instance.remoteFundPubkey = reader.readBytes(33);

        // Read contract ID (32 bytes)
        instance.contractId = reader.readBytes(32);

        return instance;
      }

      /**
       * The type for dlc_input message. dlc_input = 42773
       */
      public type = DlcInput.type;

      public length: bigint;

      public localFundPubkey: Buffer;

      public remoteFundPubkey: Buffer;

      public contractId: Buffer;

      /**
       * Validates correctness of all fields
       * @throws Will throw an error if validation fails
       */
      public validate(): void {
        if (!this.localFundPubkey) {
          throw new Error('localFundPubkey is required');
        }
        if (!this.remoteFundPubkey) {
          throw new Error('remoteFundPubkey is required');
        }
        if (!this.contractId || this.contractId.length !== 32) {
          throw new Error('contractId must be a 32-byte buffer');
        }
      }

      /**
       * Converts dlc_input to JSON
       */
      public toJSON(): IDlcInputJSON {
        return {
          localFundPubkey: this.localFundPubkey.toString('hex'),
          remoteFundPubkey: this.remoteFundPubkey.toString('hex'),
          contractId: this.contractId.toString('hex'),
        };
      }

      /**
       * Serializes the dlc_input message into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();
        writer.writeBigSize(this.type);

        const dataWriter = new BufferWriter();
        dataWriter.writeBytes(this.localFundPubkey);
        dataWriter.writeBytes(this.remoteFundPubkey);
        dataWriter.writeBytes(this.contractId);

        writer.writeBigSize(dataWriter.size);
        writer.writeBytes(dataWriter.toBuffer());

        return writer.toBuffer();
      }

      /**
       * Serializes dlc_input body without TLV wrapper (for embedding in FundingInput)
       */
      public serializeBody(): Buffer {
        const writer = new BufferWriter();
        writer.writeBytes(this.localFundPubkey);
        writer.writeBytes(this.remoteFundPubkey);
        writer.writeBytes(this.contractId);

        return writer.toBuffer();
      }
    }

    export interface IDlcInputJSON {
      localFundPubkey: string;
      remoteFundPubkey: string;
      contractId: string;
    }