@aws-cdk/core
Version:
AWS Cloud Development Kit Core Library
88 lines • 12.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.fingerprint = void 0;
const crypto = require("crypto");
const fs = require("fs");
const path = require("path");
const options_1 = require("./options");
const utils_1 = require("./utils");
const BUFFER_SIZE = 8 * 1024;
const CTRL_SOH = '\x01';
const CTRL_SOT = '\x02';
const CTRL_ETX = '\x03';
/**
* Produces fingerprint based on the contents of a single file or an entire directory tree.
*
* The fingerprint will also include:
* 1. An extra string if defined in `options.extra`.
* 2. The set of exclude patterns, if defined in `options.exclude`
* 3. The symlink follow mode value.
*
* @param fileOrDirectory The directory or file to fingerprint
* @param options Fingerprinting options
*/
function fingerprint(fileOrDirectory, options = {}) {
const hash = crypto.createHash('sha256');
_hashField(hash, 'options.extra', options.extraHash || '');
const follow = options.follow || options_1.SymlinkFollowMode.EXTERNAL;
_hashField(hash, 'options.follow', follow);
const rootDirectory = fs.statSync(fileOrDirectory).isDirectory()
? fileOrDirectory
: path.dirname(fileOrDirectory);
const exclude = options.exclude || [];
if (exclude.length) {
_hashField(hash, 'options.exclude', JSON.stringify(exclude));
}
const isDir = fs.statSync(fileOrDirectory).isDirectory();
_processFileOrDirectory(fileOrDirectory, isDir);
return hash.digest('hex');
function _processFileOrDirectory(symbolicPath, isRootDir = false, realPath = symbolicPath) {
if (!isRootDir && utils_1.shouldExclude(exclude, symbolicPath)) {
return;
}
const stat = fs.lstatSync(realPath);
const relativePath = path.relative(fileOrDirectory, symbolicPath);
if (stat.isSymbolicLink()) {
const linkTarget = fs.readlinkSync(realPath);
const resolvedLinkTarget = path.resolve(path.dirname(realPath), linkTarget);
if (utils_1.shouldFollow(follow, rootDirectory, resolvedLinkTarget)) {
_processFileOrDirectory(symbolicPath, false, resolvedLinkTarget);
}
else {
_hashField(hash, `link:${relativePath}`, linkTarget);
}
}
else if (stat.isFile()) {
_hashField(hash, `file:${relativePath}`, _contentFingerprint(realPath, stat));
}
else if (stat.isDirectory()) {
for (const item of fs.readdirSync(realPath).sort()) {
_processFileOrDirectory(path.join(symbolicPath, item), false, path.join(realPath, item));
}
}
else {
throw new Error(`Unable to hash ${symbolicPath}: it is neither a file nor a directory`);
}
}
}
exports.fingerprint = fingerprint;
function _contentFingerprint(file, stat) {
const hash = crypto.createHash('sha256');
const buffer = Buffer.alloc(BUFFER_SIZE);
// eslint-disable-next-line no-bitwise
const fd = fs.openSync(file, fs.constants.O_DSYNC | fs.constants.O_RDONLY | fs.constants.O_SYNC);
try {
let read = 0;
while ((read = fs.readSync(fd, buffer, 0, BUFFER_SIZE, null)) !== 0) {
hash.update(buffer.slice(0, read));
}
}
finally {
fs.closeSync(fd);
}
return `${stat.size}:${hash.digest('hex')}`;
}
function _hashField(hash, header, value) {
hash.update(CTRL_SOH).update(header).update(CTRL_SOT).update(value).update(CTRL_ETX);
}
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An extra string if defined in `options.extra`.\n * 2. The set of exclude patterns, if defined in `options.exclude`\n * 3. The symlink follow mode value.\n *\n * @param fileOrDirectory The directory or file to fingerprint\n * @param options Fingerprinting options\n */\nexport function fingerprint(fileOrDirectory: string, options: FingerprintOptions = { }) {\n  const hash = crypto.createHash('sha256');\n  _hashField(hash, 'options.extra', options.extraHash || '');\n  const follow = options.follow || SymlinkFollowMode.EXTERNAL;\n  _hashField(hash, 'options.follow', follow);\n\n  const rootDirectory = fs.statSync(fileOrDirectory).isDirectory()\n    ? fileOrDirectory\n    : path.dirname(fileOrDirectory);\n  const exclude = options.exclude || [];\n  if (exclude.length) {\n    _hashField(hash, 'options.exclude', JSON.stringify(exclude));\n  }\n  const isDir = fs.statSync(fileOrDirectory).isDirectory();\n  _processFileOrDirectory(fileOrDirectory, isDir);\n\n  return hash.digest('hex');\n\n  function _processFileOrDirectory(symbolicPath: string, isRootDir: boolean = false, realPath = symbolicPath) {\n    if (!isRootDir && shouldExclude(exclude, symbolicPath)) {\n      return;\n    }\n\n    const stat = fs.lstatSync(realPath);\n    const relativePath = path.relative(fileOrDirectory, symbolicPath);\n\n    if (stat.isSymbolicLink()) {\n      const linkTarget = fs.readlinkSync(realPath);\n      const resolvedLinkTarget = path.resolve(path.dirname(realPath), linkTarget);\n      if (shouldFollow(follow, rootDirectory, resolvedLinkTarget)) {\n        _processFileOrDirectory(symbolicPath, false, resolvedLinkTarget);\n      } else {\n        _hashField(hash, `link:${relativePath}`, linkTarget);\n      }\n    } else if (stat.isFile()) {\n      _hashField(hash, `file:${relativePath}`, _contentFingerprint(realPath, stat));\n    } else if (stat.isDirectory()) {\n      for (const item of fs.readdirSync(realPath).sort()) {\n        _processFileOrDirectory(path.join(symbolicPath, item), false, path.join(realPath, item));\n      }\n    } else {\n      throw new Error(`Unable to hash ${symbolicPath}: it is neither a file nor a directory`);\n    }\n  }\n}\n\nfunction _contentFingerprint(file: string, stat: fs.Stats): string {\n  const hash = crypto.createHash('sha256');\n  const buffer = Buffer.alloc(BUFFER_SIZE);\n  // eslint-disable-next-line no-bitwise\n  const fd = fs.openSync(file, fs.constants.O_DSYNC | fs.constants.O_RDONLY | fs.constants.O_SYNC);\n  try {\n    let read = 0;\n    while ((read = fs.readSync(fd, buffer, 0, BUFFER_SIZE, null)) !== 0) {\n      hash.update(buffer.slice(0, read));\n    }\n  } finally {\n    fs.closeSync(fd);\n  }\n  return `${stat.size}:${hash.digest('hex')}`;\n}\n\nfunction _hashField(hash: crypto.Hash, header: string, value: string | Buffer | DataView) {\n  hash.update(CTRL_SOH).update(header).update(CTRL_SOT).update(value).update(CTRL_ETX);\n}\n"]}