app-builder-lib
Version:
electron-builder lib
89 lines • 3.31 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.hashFileContents = exports.hashFile = exports.computeData = void 0;
const bluebird_lst_1 = require("bluebird-lst");
const crypto_1 = require("crypto");
const fs_1 = require("fs");
const promises_1 = require("fs/promises");
const path = require("path");
const asar_1 = require("./asar");
async function computeData({ resourcesPath, resourcesRelativePath }) {
// sort to produce constant result
const names = (await (0, promises_1.readdir)(resourcesPath)).filter(it => it.endsWith(".asar")).sort();
const checksums = await bluebird_lst_1.default.map(names, it => hashHeader(path.join(resourcesPath, it)));
const result = {};
for (let i = 0; i < names.length; i++) {
result[path.join(resourcesRelativePath, names[i])] = checksums[i];
}
return result;
}
exports.computeData = computeData;
async function hashHeader(file) {
const hash = (0, crypto_1.createHash)("sha256");
const { header } = await (0, asar_1.readAsarHeader)(file);
hash.update(header);
return {
algorithm: "SHA256",
hash: hash.digest("hex"),
};
}
function hashFile(file, blockSize = 4 * 1024 * 1024) {
return new Promise((resolve, reject) => {
const hash = (0, crypto_1.createHash)("sha256");
const blocks = new Array();
let blockBytes = 0;
let blockHash = (0, crypto_1.createHash)("sha256");
function updateBlockHash(chunk) {
let off = 0;
while (off < chunk.length) {
const toHash = Math.min(blockSize - blockBytes, chunk.length - off);
blockHash.update(chunk.slice(off, off + toHash));
off += toHash;
blockBytes += toHash;
if (blockBytes === blockSize) {
blocks.push(blockHash.digest("hex"));
blockHash = (0, crypto_1.createHash)("sha256");
blockBytes = 0;
}
}
}
(0, fs_1.createReadStream)(file)
.on("data", it => {
// Note that `it` is a Buffer anyway so this cast is a no-op
updateBlockHash(Buffer.from(it));
hash.update(it);
})
.on("error", reject)
.on("end", () => {
if (blockBytes !== 0) {
blocks.push(blockHash.digest("hex"));
}
resolve({
algorithm: "SHA256",
hash: hash.digest("hex"),
blockSize,
blocks,
});
});
});
}
exports.hashFile = hashFile;
function hashFileContents(contents, blockSize = 4 * 1024 * 1024) {
const buffer = Buffer.from(contents);
const hash = (0, crypto_1.createHash)("sha256");
hash.update(buffer);
const blocks = new Array();
for (let off = 0; off < buffer.length; off += blockSize) {
const blockHash = (0, crypto_1.createHash)("sha256");
blockHash.update(buffer.slice(off, off + blockSize));
blocks.push(blockHash.digest("hex"));
}
return {
algorithm: "SHA256",
hash: hash.digest("hex"),
blockSize,
blocks,
};
}
exports.hashFileContents = hashFileContents;
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