222 lines
8.5 KiB
TypeScript
222 lines
8.5 KiB
TypeScript
import { createHash, randomUUID } from 'node:crypto';
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import { open, rename, rm } from 'node:fs/promises';
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import { basename, dirname, extname, join } from 'node:path';
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import type { LearningProjectDetail } from '../../shared/learning';
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import type { WorksSquareAccountBinding } from './works-square-session';
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const PROJECT_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._-]{0,127}$/;
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const SHA256_PATTERN = /^[0-9a-f]{64}$/;
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const ARCHIVE_MIME_TYPES = new Set([
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'application/octet-stream',
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'application/x-zip-compressed',
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'application/zip',
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]);
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const REDIRECT_STATUSES = new Set([301, 302, 303, 307, 308]);
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export const LEARNING_PROJECT_DOWNLOAD_MAX_REDIRECTS = 5;
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export class LearningProjectDownloadError extends Error {
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constructor(
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readonly status: number,
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readonly code: string,
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message: string,
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) {
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super(message);
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this.name = 'LearningProjectDownloadError';
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}
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}
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export function safeLearningProjectArchiveFileName(value: string, projectId: string): string {
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const fallbackId = projectId.replace(/[^A-Za-z0-9_-]+/g, '-').slice(0, 48) || 'project';
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const normalized = [...basename(value.trim().replace(/\\/g, '/'))]
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.map((character) => character.charCodeAt(0) < 32 ? '-' : character)
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.join('')
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.replace(/[<>:"/\\|?*]/g, '-')
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.replace(/[. ]+$/g, '')
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.slice(0, 120);
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if (!normalized || extname(normalized).toLowerCase() !== '.zip') {
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return `Makelore-${fallbackId}.zip`;
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}
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return normalized;
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}
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function assertCurrentAccount(
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binding: WorksSquareAccountBinding,
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isCurrentAccountBinding: (value: WorksSquareAccountBinding) => boolean,
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): void {
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if (!isCurrentAccountBinding(binding)) {
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throw new LearningProjectDownloadError(409, 'LEARNING_ACCOUNT_CHANGED', '登录账号已更改，请重新下载');
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}
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}
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function validateProject(project: LearningProjectDetail): void {
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if (!PROJECT_ID_PATTERN.test(project.id)
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|| !SHA256_PATTERN.test(project.archiveSha256)) {
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throw new LearningProjectDownloadError(502, 'LEARNING_PROJECT_INVALID', '项目下载信息无效');
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}
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}
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async function followRedirects(input: {
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response: Response;
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initialUrl: string;
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apiOrigin: string;
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fetchImpl: typeof fetch;
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binding: WorksSquareAccountBinding;
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isCurrentAccountBinding: (value: WorksSquareAccountBinding) => boolean;
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}): Promise<Response> {
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let response = input.response;
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let currentUrl = new URL(input.initialUrl).href;
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const visited = new Set([currentUrl]);
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for (let hop = 0; REDIRECT_STATUSES.has(response.status); hop += 1) {
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if (hop >= LEARNING_PROJECT_DOWNLOAD_MAX_REDIRECTS) {
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await response.body?.cancel().catch(() => undefined);
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throw new LearningProjectDownloadError(502, 'LEARNING_DOWNLOAD_REDIRECT_LIMIT', '项目下载重定向次数过多');
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}
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const location = response.headers.get('location');
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await response.body?.cancel().catch(() => undefined);
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if (!location) {
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throw new LearningProjectDownloadError(502, 'LEARNING_DOWNLOAD_REDIRECT_INVALID', '项目下载地址无效');
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}
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let target: URL;
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try {
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target = new URL(location, currentUrl);
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} catch {
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throw new LearningProjectDownloadError(502, 'LEARNING_DOWNLOAD_REDIRECT_INVALID', '项目下载地址无效');
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}
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if (!['http:', 'https:'].includes(target.protocol)
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|| target.origin !== input.apiOrigin
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|| Boolean(target.username || target.password)
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|| visited.has(target.href)) {
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throw new LearningProjectDownloadError(502, 'LEARNING_DOWNLOAD_REDIRECT_INVALID', '项目下载地址不安全');
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}
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visited.add(target.href);
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assertCurrentAccount(input.binding, input.isCurrentAccountBinding);
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response = await input.fetchImpl(target, {
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method: 'GET',
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headers: { Accept: 'application/zip' },
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redirect: 'manual',
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});
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currentUrl = target.href;
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}
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return response;
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}
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async function writeVerifiedArchive(input: {
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response: Response;
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temporaryPath: string;
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project: LearningProjectDetail;
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binding: WorksSquareAccountBinding;
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isCurrentAccountBinding: (value: WorksSquareAccountBinding) => boolean;
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}): Promise<void> {
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if (!input.response.body) {
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throw new LearningProjectDownloadError(502, 'LEARNING_DOWNLOAD_EMPTY', '项目压缩包内容为空');
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}
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const contentType = input.response.headers.get('content-type')?.split(';', 1)[0]?.trim().toLowerCase();
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if (!contentType || !ARCHIVE_MIME_TYPES.has(contentType)) {
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await input.response.body.cancel().catch(() => undefined);
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throw new LearningProjectDownloadError(502, 'LEARNING_ARCHIVE_MIME_INVALID', '项目压缩包类型无效');
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}
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const handle = await open(input.temporaryPath, 'wx');
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const hash = createHash('sha256');
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const signature: number[] = [];
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const reader = input.response.body.getReader();
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try {
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while (true) {
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const { done, value } = await reader.read();
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if (done) break;
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assertCurrentAccount(input.binding, input.isCurrentAccountBinding);
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for (const byte of value.subarray(0, Math.max(0, 4 - signature.length))) signature.push(byte);
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hash.update(value);
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await handle.write(value);
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}
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} finally {
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reader.releaseLock();
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await handle.close();
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}
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if (signature.length < 4 || signature[0] !== 0x50 || signature[1] !== 0x4b
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|| !((signature[2] === 0x03 && signature[3] === 0x04)
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|| (signature[2] === 0x05 && signature[3] === 0x06)
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|| (signature[2] === 0x07 && signature[3] === 0x08))) {
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throw new LearningProjectDownloadError(502, 'LEARNING_ARCHIVE_INVALID', '项目压缩包不是有效的 ZIP 文件');
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}
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if (hash.digest('hex') !== input.project.archiveSha256) {
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throw new LearningProjectDownloadError(502, 'LEARNING_ARCHIVE_HASH_MISMATCH', '项目压缩包完整性校验失败');
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}
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}
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export async function saveLearningProjectArchive(input: {
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project: LearningProjectDetail;
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destinationPath: string;
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binding: WorksSquareAccountBinding;
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fetchImpl: typeof fetch;
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getAccessToken: (options?: { fetchImpl?: typeof fetch; forceRefresh?: boolean }) => Promise<string | null>;
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isCurrentAccountBinding: (value: WorksSquareAccountBinding) => boolean;
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apiBaseUrl: string;
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}): Promise<void> {
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validateProject(input.project);
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assertCurrentAccount(input.binding, input.isCurrentAccountBinding);
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const apiBaseUrl = input.apiBaseUrl.replace(/\/+$/, '');
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const archiveUrl = `${apiBaseUrl}/api/learning/projects/${encodeURIComponent(input.project.id)}/archive`;
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const request = (accessToken: string) => input.fetchImpl(archiveUrl, {
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method: 'GET',
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headers: {
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Accept: 'application/zip',
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Authorization: `Bearer ${accessToken}`,
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},
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redirect: 'manual',
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});
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const token = await input.getAccessToken({ fetchImpl: input.fetchImpl });
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assertCurrentAccount(input.binding, input.isCurrentAccountBinding);
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if (!token) {
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throw new LearningProjectDownloadError(401, 'LEARNING_AUTH_REQUIRED', '请先登录');
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}
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let response = await request(token);
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if (response.status === 401) {
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await response.body?.cancel().catch(() => undefined);
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const refreshed = await input.getAccessToken({ fetchImpl: input.fetchImpl, forceRefresh: true });
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assertCurrentAccount(input.binding, input.isCurrentAccountBinding);
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if (!refreshed) {
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throw new LearningProjectDownloadError(401, 'LEARNING_AUTH_REQUIRED', '请先登录');
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}
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response = await request(refreshed);
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}
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response = await followRedirects({
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response,
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initialUrl: archiveUrl,
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apiOrigin: new URL(apiBaseUrl).origin,
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fetchImpl: input.fetchImpl,
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binding: input.binding,
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isCurrentAccountBinding: input.isCurrentAccountBinding,
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});
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if (!response.ok) {
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await response.body?.cancel().catch(() => undefined);
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throw new LearningProjectDownloadError(
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response.status >= 400 && response.status <= 599 ? response.status : 502,
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'LEARNING_DOWNLOAD_FAILED',
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'项目下载失败，请稍后重试',
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);
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}
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const temporaryPath = join(
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dirname(input.destinationPath),
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`.${basename(input.destinationPath)}.${randomUUID()}.download`,
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);
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try {
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await writeVerifiedArchive({
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response,
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temporaryPath,
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project: input.project,
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binding: input.binding,
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isCurrentAccountBinding: input.isCurrentAccountBinding,
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});
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assertCurrentAccount(input.binding, input.isCurrentAccountBinding);
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await rename(temporaryPath, input.destinationPath);
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} catch (error) {
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await rm(temporaryPath, { force: true }).catch(() => undefined);
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if (error instanceof LearningProjectDownloadError) throw error;
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throw new LearningProjectDownloadError(500, 'LEARNING_SAVE_FAILED', '项目保存失败，请重新选择位置后重试');
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}
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}
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