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server.ts
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server.ts
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import type {
BatchAdapter,
BatchResponseObject,
BatchServerOptions,
LFSFile,
LFSObject
} from './types.ts';
import {parseAuthorization} from './authorization.ts';
import {parseRequest, parseVerify} from './request.ts';
import {BatchStore} from './store.ts';
import {acceptError, joinURL, jsonResponse, methodError, validateId} from './utils.ts';
/**
* Git LFS server clas
*/
export class BatchServer {
#store: BatchStore;
#adapter: BatchAdapter;
#fsRoot: URL;
#url: URL;
#origin: URL;
#username: string;
#password: string;
constructor(options: BatchServerOptions) {
this.#adapter = options.adapter;
this.#username = options.username ?? '';
this.#password = options.password ?? '';
this.#store = new BatchStore();
this.#url = options.url;
// Differs if behind HTTPS proxy
this.#origin = new URL(options.origin ?? options.url);
// Runtime entry must validate `fsRoot` directory
this.#fsRoot = new URL(`file://${options.fsRoot}`);
console.info(
`+----------`,
`\n+ Local: ${this.#url.href}`,
`\n+ Origin: ${this.#origin.href}`,
`\n+----------`
);
}
async handle(request: Request): Promise<Response> {
// Validate URL (bad adapter)
const url = URL.parse(request.url);
if (!url) {
return new Response(null, {status: 400});
}
// Modify request for reverse proxies
if (this.#origin.href !== this.#url.href) {
if (request.headers.has('x-forwarded-host')) {
url.host = request.headers.get('x-forwarded-host') ?? '';
}
if (request.headers.has('x-forwarded-proto')) {
url.protocol = request.headers.get('x-forwarded-proto') ?? '';
}
request = new Request(url, {
method: request.method,
headers: request.headers,
body: request.body
});
if (this.#origin.hostname !== url.hostname || this.#origin.protocol !== url.protocol) {
return new Response(null, {status: 404});
}
}
// Handle Batch API
const batchPathname = '/:repo([a-zA-Z0-9._-]+)/objects/batch';
const batchMatch = new URLPattern({pathname: batchPathname}).exec(url);
if (batchMatch) {
const repo = batchMatch.pathname.groups.repo!;
return this.#batch(request, repo);
}
// Handle transfer operations
const repoPathname = '/:repo([a-zA-Z0-9._-]+)/:operation/:uuid([0-9a-f-]{36})';
const repoMatch = new URLPattern({pathname: repoPathname}).exec(request.url);
if (repoMatch) {
const {repo, operation, uuid} = repoMatch.pathname.groups;
const key = `${operation}/${uuid}`;
const valid = validateId(uuid!) && this.#store.has(key);
if (repo && valid) {
switch (operation) {
case 'download':
return this.#download(request, repo, key);
case 'upload':
return this.#upload(request, repo, key);
case 'verify':
return this.#verify(request, repo, key);
}
}
}
return new Response(null, {status: 404});
}
/** Return object with file path */
#getFile(object: LFSObject, repo: string): LFSFile {
const {oid, size} = object;
const {pathname} = joinURL(`${repo}/${object.oid}`, this.#fsRoot);
return {
oid,
pathname,
repo,
size
};
}
/** Handle requests to `/objects/batch` */
async #batch(request: Request, repo: string): Promise<Response> {
const methodErr = methodError(request, 'POST');
if (methodErr) return methodErr;
const acceptErr = acceptError(request);
if (acceptErr) return acceptErr;
// Validate basic HTTP auth
const credentials = parseAuthorization(request);
if (credentials?.username !== this.#username || credentials?.password !== this.#password) {
return jsonResponse(401, {message: 'Invalid credentials'});
}
// Parse request payload
const body = await parseRequest(request);
if (!body) {
return jsonResponse(422, {message: 'Invalid objects'});
}
if (!['download', 'upload'].includes(body?.operation)) {
return jsonResponse(400, {message: 'Unknown operation'});
}
// Generate response payload
const json = this.#store.respond(body, joinURL(repo, this.#origin));
// Replace missing download objects with error
if (body.operation === 'download') {
const checks: Array<Promise<void>> = [];
for (let i = 0; i < json.objects.length; i++) {
const {oid, size, pathname} = this.#getFile(json.objects[i], repo);
checks.push(
this.#adapter.check({oid, size, pathname, repo}).then((exists) => {
if (exists) return;
json.objects[i] = {
oid,
size,
error: {
code: 404,
message: 'Object does not exist'
}
// @todo fix forced type
} as BatchResponseObject;
})
);
}
await Promise.all(checks);
}
return jsonResponse(200, json);
}
/** Handle requests to `/download/:uuid` */
#download(request: Request, repo: string, key: string): Promise<Response> | Response {
const methodErr = methodError(request, 'GET');
if (methodErr) return methodErr;
const transfer = this.#store.get(key)!;
this.#store.delete(key);
// Check bearer token in header
if (
request.headers.get('authorization') !== transfer.actions?.download?.header?.['authorization']
) {
return jsonResponse(401, {message: 'Invalid token'});
}
return this.#adapter.download(this.#getFile(transfer, repo), request);
}
/** Handle requests to `/upload/:uuid` */
#upload(request: Request, repo: string, key: string): Promise<Response> | Response {
const methodErr = methodError(request, 'PUT');
if (methodErr) return methodErr;
const transfer = this.#store.get(key)!;
this.#store.delete(key);
// Check bearer token in header
if (
request.headers.get('authorization') !== transfer.actions?.upload?.header?.['authorization']
) {
return jsonResponse(401, {message: 'Invalid token'});
}
// Check content length matches
if (!request.body || request.headers.get('content-length') !== transfer.size.toString()) {
return jsonResponse(400, {message: 'Invalid upload'});
}
return this.#adapter.upload(this.#getFile(transfer, repo), request);
}
/** Handle requests to `/verify/:uuid` */
async #verify(request: Request, repo: string, key: string): Promise<Response> {
const methodErr = methodError(request, 'POST');
if (methodErr) return methodErr;
const acceptErr = acceptError(request);
if (acceptErr) return acceptErr;
const transfer = this.#store.get(key)!;
this.#store.delete(key);
// Check bearer token in header
if (
request.headers.get('authorization') !== transfer.actions?.verify?.header?.['authorization']
) {
return jsonResponse(401, {message: 'Invalid token'});
}
// Parse request payload
const object = await parseVerify(request);
if (!object) {
return jsonResponse(422, {message: 'Invalid object'});
}
if (await this.#adapter.check(this.#getFile(transfer, repo))) {
return new Response(null, {status: 200});
}
return jsonResponse(404, {message: 'Object not found'});
}
}