index.ts

import { checkForSubFilter, preparePDF } from "./generalUtils";
import { extractSignature } from "./signatureUtils";
import { verify } from "./verify";

export const verifyPDF = (pdf: Buffer) => {
  const pdfBuffer = preparePDF(pdf);
  try {
    checkForSubFilter(pdfBuffer);
  } catch (error) {
    //SubFilter is only available if there is a sig in the pdf
    return null;
  }

  try {
    const { signatureStr, signedData, signatureMeta } =
      extractSignature(pdfBuffer);

    const signatures: any = signedData.map((_signed, index) => {
      return verify(signatureStr[index], signatureMeta[index]);
    });

    return {
      // authenticity: signatures.every((o) => o.authenticity === true),
      expired: signatures.some((o) => o.expired === true),
      signatures,
    };
  } catch (error) {
    return { verified: false, message: error.message, error };
  }
};