makehash.js

const crypto = require("crypto");
const fs = require("fs");
const { fasttest } = require("./config");
const path = require("path");
const itemstore = require("./storemgr/itemstore");

function createSha256(plainstring) {

    var h = crypto.createHash("sha256", {encoding:"binary" });

  h.update(plainstring);

  return h.digest("base64");
}

async function HashItem(db, storeitem, location, original = false) {
  try {
    itemstore.InitDB(db);

    var filename = path.join(location, storeitem.FileNameOnServer);

    var digest = createSha256FromFile(filename);

    var succ = await itemstore.setHash(storeitem.Id, digest, original);

    return {
      success: succ,
      item: storeitem,
      location: location,
      hash: digest,
      err: null,
    };
  } catch (err) {
    return {
      success: false,
      item: storeitem,
      location: location,
      hash: null,
      err: err,
    };
  }
}

function createSha256FromFile(filename) {
  var h = crypto.createHash("sha256",undefined);

  var src = fs.openSync(filename, "r");

  var buf = Buffer.alloc(1024, 0);

  var i = fs.readSync(src, buf, 0, 1024);

  while (i > 0) {
    if (i < 1024) {
      h.update(buf.subarray(0, i - 1));
    } else {
      h.update(buf);
    }

    i = fs.readSync(src, buf, 0, 1024);
  }

  fs.closeSync(src);

  return h.digest("base64");
}

function checkHash(hash, file) {
  var hash2 = createSha256FromFile(file);

  return hash2 == hash;
}

module.exports = {
  HashItem,
  HashItem,
  CreateSha256: createSha256,
  CreateSha256FromFile: createSha256FromFile,
  checkHash: checkHash,
};
const crypto = require("crypto");
const fs = require("fs");
const { fasttest } = require("./config");
const path = require("path");
const itemstore = require("./storemgr/itemstore");

function createSha256(plainstring) {

    var h = crypto.createHash("sha256", {encoding:"binary" });

  h.update(plainstring);

  return h.digest("base64");
}

async function HashItem(db, storeitem, location, original = false) {
  try {
    itemstore.InitDB(db);

    var filename = path.join(location, storeitem.FileNameOnServer);

    var digest = createSha256FromFile(filename);

    var succ = await itemstore.setHash(storeitem.Id, digest, original);

    return {
      success: succ,
      item: storeitem,
      location: location,
      hash: digest,
      err: null,
    };
  } catch (err) {
    return {
      success: false,
      item: storeitem,
      location: location,
      hash: null,
      err: err,
    };
  }
}

function createSha256FromFile(filename) {
  var h = crypto.createHash("sha256",undefined);

  var src = fs.openSync(filename, "r");

  var buf = Buffer.alloc(1024, 0);

  var i = fs.readSync(src, buf, 0, 1024);

  while (i > 0) {
    if (i < 1024) {
      h.update(buf.subarray(0, i - 1));
    } else {
      h.update(buf);
    }

    i = fs.readSync(src, buf, 0, 1024);
  }

  fs.closeSync(src);

  return h.digest("base64");
}

function checkHash(hash, file) {
  var hash2 = createSha256FromFile(file);

  return hash2 == hash;
}

module.exports = {
  HashItem,
  HashItem,
  CreateSha256: createSha256,
  CreateSha256FromFile: createSha256FromFile,
  checkHash: checkHash,
};