import debug from 'debug';
import * as fs from 'fs-extra';
import * as path from 'path';
import * as semver from 'semver';
import * as sumchecker from 'sumchecker';
import { getArtifactFileName, getArtifactRemoteURL, getArtifactVersion } from './artifact-utils';
import { Cache } from './Cache';
import { getDownloaderForSystem } from './downloader-resolver';
import { initializeProxy } from './proxy';
import { withTempDirectoryIn, getHostArch, getNodeArch, ensureIsTruthyString, isOfficialLinuxIA32Download, } from './utils';
export { getHostArch } from './utils';
export { initializeProxy } from './proxy';
const d = debug('@electron/get:index');
if (process.env.ELECTRON_GET_USE_PROXY) {
    initializeProxy();
}
async function validateArtifact(artifactDetails, downloadedAssetPath, _downloadArtifact) {
    return await withTempDirectoryIn(artifactDetails.tempDirectory, async (tempFolder) => {
        // Don't try to verify the hash of the hash file itself
        // and for older versions that don't have a SHASUMS256.txt
        if (!artifactDetails.artifactName.startsWith('SHASUMS256') &&
            !artifactDetails.unsafelyDisableChecksums &&
            semver.gte(artifactDetails.version, '1.3.2')) {
            let shasumPath;
            const checksums = artifactDetails.checksums;
            if (checksums) {
                shasumPath = path.resolve(tempFolder, 'SHASUMS256.txt');
                const fileNames = Object.keys(checksums);
                if (fileNames.length === 0) {
                    throw new Error('Provided "checksums" object is empty, cannot generate a valid SHASUMS256.txt');
                }
                const generatedChecksums = fileNames
                    .map(fileName => `${checksums[fileName]} *${fileName}`)
                    .join('\n');
                await fs.writeFile(shasumPath, generatedChecksums);
            }
            else {
                shasumPath = await _downloadArtifact({
                    isGeneric: true,
                    version: artifactDetails.version,
                    artifactName: 'SHASUMS256.txt',
                    force: artifactDetails.force,
                    downloadOptions: artifactDetails.downloadOptions,
                    cacheRoot: artifactDetails.cacheRoot,
                    downloader: artifactDetails.downloader,
                    mirrorOptions: artifactDetails.mirrorOptions,
                });
            }
            // For versions 1.3.2 - 1.3.4, need to overwrite the `defaultTextEncoding` option:
            // https://github.com/electron/electron/pull/6676#discussion_r75332120
            if (semver.satisfies(artifactDetails.version, '1.3.2 - 1.3.4')) {
                const validatorOptions = {};
                validatorOptions.defaultTextEncoding = 'binary';
                const checker = new sumchecker.ChecksumValidator('sha256', shasumPath, validatorOptions);
                await checker.validate(path.dirname(downloadedAssetPath), path.basename(downloadedAssetPath));
            }
            else {
                await sumchecker('sha256', shasumPath, path.dirname(downloadedAssetPath), [
                    path.basename(downloadedAssetPath),
                ]);
            }
        }
    });
}
/**
 * Downloads an artifact from an Electron release and returns an absolute path
 * to the downloaded file.
 *
 * @param artifactDetails - The information required to download the artifact
 */
export async function downloadArtifact(_artifactDetails) {
    const artifactDetails = Object.assign({}, _artifactDetails);
    if (!_artifactDetails.isGeneric) {
        const platformArtifactDetails = artifactDetails;
        if (!platformArtifactDetails.platform) {
            d('No platform found, defaulting to the host platform');
            platformArtifactDetails.platform = process.platform;
        }
        if (platformArtifactDetails.arch) {
            platformArtifactDetails.arch = getNodeArch(platformArtifactDetails.arch);
        }
        else {
            d('No arch found, defaulting to the host arch');
            platformArtifactDetails.arch = getHostArch();
        }
    }
    ensureIsTruthyString(artifactDetails, 'version');
    artifactDetails.version = getArtifactVersion(artifactDetails);
    const fileName = getArtifactFileName(artifactDetails);
    const url = await getArtifactRemoteURL(artifactDetails);
    const cache = new Cache(artifactDetails.cacheRoot);
    // Do not check if the file exists in the cache when force === true
    if (!artifactDetails.force) {
        d(`Checking the cache (${artifactDetails.cacheRoot}) for ${fileName} (${url})`);
        const cachedPath = await cache.getPathForFileInCache(url, fileName);
        if (cachedPath === null) {
            d('Cache miss');
        }
        else {
            d('Cache hit');
            try {
                await validateArtifact(artifactDetails, cachedPath, downloadArtifact);
                return cachedPath;
            }
            catch (err) {
                d("Artifact in cache didn't match checksums", err);
                d('falling back to re-download');
            }
        }
    }
    if (!artifactDetails.isGeneric &&
        isOfficialLinuxIA32Download(artifactDetails.platform, artifactDetails.arch, artifactDetails.version, artifactDetails.mirrorOptions)) {
        console.warn('Official Linux/ia32 support is deprecated.');
        console.warn('For more info: https://electronjs.org/blog/linux-32bit-support');
    }
    return await withTempDirectoryIn(artifactDetails.tempDirectory, async (tempFolder) => {
        const tempDownloadPath = path.resolve(tempFolder, getArtifactFileName(artifactDetails));
        const downloader = artifactDetails.downloader || (await getDownloaderForSystem());
        d(`Downloading ${url} to ${tempDownloadPath} with options: ${JSON.stringify(artifactDetails.downloadOptions)}`);
        await downloader.download(url, tempDownloadPath, artifactDetails.downloadOptions);
        await validateArtifact(artifactDetails, tempDownloadPath, downloadArtifact);
        return await cache.putFileInCache(url, tempDownloadPath, fileName);
    });
}
/**
 * Downloads a specific version of Electron and returns an absolute path to a
 * ZIP file.
 *
 * @param version - The version of Electron you want to download
 */
export function download(version, options) {
    return downloadArtifact(Object.assign(Object.assign({}, options), { version, platform: process.platform, arch: process.arch, artifactName: 'electron' }));
}
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