All files / src/data-package SignedDataPackage.ts

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import { Signature } from "ethers";
import {
  arrayify,
  base64,
  concat,
  joinSignature,
  splitSignature,
} from "ethers/lib/utils";
import { Serializable } from "../common/Serializable";
import { DataPackage, DataPackagePlainObj } from "./DataPackage";
import {
  SignedDataPackageLike,
  deserializeSignedPackage,
  recoverSignerAddress,
  recoverSignerPublicKey,
} from "./signed-package-deserializing";
 
export interface SignedDataPackagePlainObj extends DataPackagePlainObj {
  signature: string; // base64-encoded joined signature
}
 
export class SignedDataPackage
  extends Serializable
  implements SignedDataPackageLike
{
  public readonly signature: Signature;
 
  constructor(
    public readonly dataPackage: DataPackage,
    signature: Signature | string
  ) {
    super();
    if (typeof signature === "string") {
      this.signature = splitSignature(signature);
    } else {
      this.signature = signature;
    }
  }
 
  serializeSignatureToBytes(): Uint8Array {
    return arrayify(this.serializeSignatureToHex());
  }
 
  serializeSignatureToHex(): string {
    return joinSignature(this.signature);
  }
 
  recoverSignerPublicKey(): Uint8Array {
    return recoverSignerPublicKey(this);
  }
 
  recoverSignerAddress(): string {
    return recoverSignerAddress(this);
  }
 
  toBytes(): Uint8Array {
    return concat([
      this.dataPackage.toBytes(),
      this.serializeSignatureToBytes(),
    ]);
  }
 
  toObj(): SignedDataPackagePlainObj {
    const signatureHex = this.serializeSignatureToHex();
 
    return {
      ...this.dataPackage.toObj(),
      signature: base64.encode(signatureHex),
    };
  }
 
  public static fromObj(
    plainObject: SignedDataPackagePlainObj
  ): SignedDataPackage {
    return SignedDataPackage.fromObjLikeThis(
      deserializeSignedPackage(plainObject)
    );
  }
 
  private static fromObjLikeThis(object: SignedDataPackageLike) {
    return new SignedDataPackage(object.dataPackage, object.signature);
  }
}