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"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.TargetFile = exports.MetaFile = void 0;
const crypto_1 = __importDefault(require("crypto"));
const util_1 = __importDefault(require("util"));
const error_1 = require("../error");
const guard_1 = require("../utils/guard");
// A container with information about a particular metadata file.
//
// This class is used for Timestamp and Snapshot metadata.
class MetaFile {
constructor(opts) {
if (opts.version <= 0) {
throw new error_1.ValueError('Metafile version must be at least 1');
}
if (opts.length !== undefined) {
validateLength(opts.length);
}
this.version = opts.version;
this.length = opts.length;
this.hashes = opts.hashes;
this.unrecognizedFields = opts.unrecognizedFields || {};
}
equals(other) {
if (!(other instanceof MetaFile)) {
return false;
}
return (this.version === other.version &&
this.length === other.length &&
util_1.default.isDeepStrictEqual(this.hashes, other.hashes) &&
util_1.default.isDeepStrictEqual(this.unrecognizedFields, other.unrecognizedFields));
}
verify(data) {
// Verifies that the given data matches the expected length.
if (this.length !== undefined) {
if (data.length !== this.length) {
throw new error_1.LengthOrHashMismatchError(`Expected length ${this.length} but got ${data.length}`);
}
}
// Verifies that the given data matches the supplied hashes.
if (this.hashes) {
Object.entries(this.hashes).forEach(([key, value]) => {
let hash;
try {
hash = crypto_1.default.createHash(key);
}
catch (e) {
throw new error_1.LengthOrHashMismatchError(`Hash algorithm ${key} not supported`);
}
const observedHash = hash.update(data).digest('hex');
if (observedHash !== value) {
throw new error_1.LengthOrHashMismatchError(`Expected hash ${value} but got ${observedHash}`);
}
});
}
}
toJSON() {
const json = {
version: this.version,
...this.unrecognizedFields,
};
if (this.length !== undefined) {
json.length = this.length;
}
if (this.hashes) {
json.hashes = this.hashes;
}
return json;
}
static fromJSON(data) {
const { version, length, hashes, ...rest } = data;
if (typeof version !== 'number') {
throw new TypeError('version must be a number');
}
if ((0, guard_1.isDefined)(length) && typeof length !== 'number') {
throw new TypeError('length must be a number');
}
if ((0, guard_1.isDefined)(hashes) && !(0, guard_1.isStringRecord)(hashes)) {
throw new TypeError('hashes must be string keys and values');
}
return new MetaFile({
version,
length,
hashes,
unrecognizedFields: rest,
});
}
}
exports.MetaFile = MetaFile;
// Container for info about a particular target file.
//
// This class is used for Target metadata.
class TargetFile {
constructor(opts) {
validateLength(opts.length);
this.length = opts.length;
this.path = opts.path;
this.hashes = opts.hashes;
this.unrecognizedFields = opts.unrecognizedFields || {};
}
get custom() {
const custom = this.unrecognizedFields['custom'];
if (!custom || Array.isArray(custom) || !(typeof custom === 'object')) {
return {};
}
return custom;
}
equals(other) {
if (!(other instanceof TargetFile)) {
return false;
}
return (this.length === other.length &&
this.path === other.path &&
util_1.default.isDeepStrictEqual(this.hashes, other.hashes) &&
util_1.default.isDeepStrictEqual(this.unrecognizedFields, other.unrecognizedFields));
}
async verify(stream) {
let observedLength = 0;
// Create a digest for each hash algorithm
const digests = Object.keys(this.hashes).reduce((acc, key) => {
try {
acc[key] = crypto_1.default.createHash(key);
}
catch (e) {
throw new error_1.LengthOrHashMismatchError(`Hash algorithm ${key} not supported`);
}
return acc;
}, {});
// Read stream chunk by chunk
for await (const chunk of stream) {
// Keep running tally of stream length
observedLength += chunk.length;
// Append chunk to each digest
Object.values(digests).forEach((digest) => {
digest.update(chunk);
});
}
// Verify length matches expected value
if (observedLength !== this.length) {
throw new error_1.LengthOrHashMismatchError(`Expected length ${this.length} but got ${observedLength}`);
}
// Verify each digest matches expected value
Object.entries(digests).forEach(([key, value]) => {
const expected = this.hashes[key];
const actual = value.digest('hex');
if (actual !== expected) {
throw new error_1.LengthOrHashMismatchError(`Expected hash ${expected} but got ${actual}`);
}
});
}
toJSON() {
return {
length: this.length,
hashes: this.hashes,
...this.unrecognizedFields,
};
}
static fromJSON(path, data) {
const { length, hashes, ...rest } = data;
if (typeof length !== 'number') {
throw new TypeError('length must be a number');
}
if (!(0, guard_1.isStringRecord)(hashes)) {
throw new TypeError('hashes must have string keys and values');
}
return new TargetFile({
length,
path,
hashes,
unrecognizedFields: rest,
});
}
}
exports.TargetFile = TargetFile;
// Check that supplied length if valid
function validateLength(length) {
if (length < 0) {
throw new error_1.ValueError('Length must be at least 0');
}
}
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