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* Git LFS access over the Artifactory batch API.
*
* Hydrates (downloads) and uploads the V1 CSS LFS objects for the gitcore drop.
* Auth is HTTP Basic sourced from the local `git credential` helper. The service
* is deliberately secret-safe: credentials, action headers, signed URLs, and raw
* HTTP response bodies are never logged or embedded in thrown errors.
*
* LFS terms used below: an *object* is the real file content, addressed by its
* SHA-256 (*oid*); a *pointer* is the small text stub committed to git in its
* place; the *batch API* negotiates per-object upload/download URLs.
*/
import { createHash } from 'node:crypto';
import { execa } from 'execa';
import { DEFAULT_GIT_LFS_BATCH_ENDPOINT, DEFAULT_GIT_LFS_CREDENTIAL_HOST } from '../config.js';
import type { Logger } from '../utils/logger.js';
export type GitLfsPointer = {
oid: string;
size: number;
};
type Credentials = {
username: string;
password: string;
};
type UploadObject = { oid: string; size: number; content: Buffer };
// Dedupe by oid and re-verify each object: oid must be the SHA-256 of its bytes
// and size must match. A repeated oid with different bytes is a hard conflict.
// Shared by uploadObjects and queryObjects so both enforce the same invariants.
function validateAndDeduplicateObjects(objects: UploadObject[]): Map<string, UploadObject> {
const unique = new Map<string, UploadObject>();
for (const object of objects) {
const existing = unique.get(object.oid);
if (existing && (existing.size !== object.size || !existing.content.equals(object.content))) {
throw new Error(`Git LFS object conflict for ${object.oid}`);
}
if (!existing) unique.set(object.oid, object);
}
for (const object of unique.values()) {
const oid = createHash('sha256').update(object.content).digest('hex');
if (
!/^[a-f0-9]{64}$/.test(object.oid) ||
!Number.isSafeInteger(object.size) ||
object.size < 0 ||
object.content.length !== object.size ||
oid !== object.oid
) {
throw new Error('Invalid Git LFS upload object');
}
}
return unique;
}
// Validate the batch response and index it by oid: one entry per requested
// object, matching oid + size, no per-object error. Parse failures and shape
// violations collapse to a generic message so no response body leaks.
async function parseBatchResponse(
response: Response,
requested: Map<string, UploadObject>,
): Promise<Map<string, Record<string, unknown>>> {
let batch: unknown;
try {
batch = await response.json();
} catch {
throw new Error('Unexpected Git LFS batch response');
}
if (
!isRecord(batch) ||
(batch.transfer !== undefined && batch.transfer !== 'basic') ||
!Array.isArray(batch.objects) ||
batch.objects.length !== requested.size
) {
throw new Error('Unexpected Git LFS batch response');
}
const responseObjects = new Map<string, Record<string, unknown>>();
for (const object of batch.objects) {
if (!isRecord(object) || typeof object.oid !== 'string' || responseObjects.has(object.oid)) {
throw new Error('Unexpected Git LFS batch response');
}
const input = requested.get(object.oid);
if (!input || object.size !== input.size || object.error) {
throw new Error('Unexpected Git LFS batch response');
}
responseObjects.set(object.oid, object);
}
return responseObjects;
}
// Strictly parse the canonical 3-line LFS pointer (version / oid sha256 / size,
// trailing newline). Anything else throws.
export function parseLfsPointer(content: Buffer): GitLfsPointer {
const match = content
.toString('utf8')
.match(
/^version https:\/\/git-lfs\.github\.com\/spec\/v1\noid sha256:([a-f0-9]{64})\nsize (0|[1-9][0-9]*)\n$/,
);
const size = match ? Number(match[2]) : Number.NaN;
if (!match || !Number.isSafeInteger(size)) {
throw new Error('Invalid Git LFS pointer');
}
return { oid: match[1], size };
}
export class GitLfsService {
// Caches hydrated objects by oid (keeping the declared size) so a repeated
// pointer is downloaded once; callers get a defensive copy.
private readonly cache = new Map<string, { size: number; content: Promise<Buffer> }>();
constructor(
private readonly logger: Logger,
private readonly batchEndpoint = DEFAULT_GIT_LFS_BATCH_ENDPOINT,
private readonly credentialHost = DEFAULT_GIT_LFS_CREDENTIAL_HOST,
private readonly fetchFn: typeof fetch = fetch,
private readonly execaFn: typeof execa = execa,
) {}
// Download the object a pointer refers to, verifying its size + SHA-256.
// Returns a defensive copy; a cached oid with a conflicting size is rejected.
hydrate(pointerBytes: Buffer): Promise<Buffer> {
const pointer = parseLfsPointer(pointerBytes);
const cached = this.cache.get(pointer.oid);
if (cached) {
if (cached.size !== pointer.size) {
return Promise.reject(new Error(`Git LFS size mismatch for ${pointer.oid}`));
}
return cached.content.then((content) => Buffer.from(content));
}
const hydration = this.download(pointer).catch((error: unknown) => {
this.cache.delete(pointer.oid);
throw error;
});
this.cache.set(pointer.oid, { size: pointer.size, content: hydration });
return hydration.then((content) => Buffer.from(content));
}
// Upload the given objects, idempotently. The batch response's omitted upload
// action means the server already has that object (skip it); otherwise PUT the
// raw bytes and run any verify action. Uploads run concurrently but the result
// lists stay in input order. Safe to re-run: already-present objects are skipped.
async uploadObjects(objects: UploadObject[]): Promise<{ uploaded: string[]; alreadyPresent: string[] }> {
const unique = validateAndDeduplicateObjects(objects);
if (unique.size === 0) {
return { uploaded: [], alreadyPresent: [] };
}
// Enforce HTTPS before any credential is attached to a request.
const batchUrl = new URL(this.batchEndpoint);
Iif (batchUrl.protocol !== 'https:') {
throw new Error('Git LFS batch endpoint must use HTTPS');
}
const credentials = await this.credentials(batchUrl, this.credentialHost);
let batchResponse: Response;
try {
batchResponse = await this.fetchFn(this.batchEndpoint, {
method: 'POST',
headers: {
Accept: 'application/vnd.git-lfs+json',
'Content-Type': 'application/vnd.git-lfs+json',
Authorization: this.basicHeader(credentials),
},
body: JSON.stringify({
operation: 'upload',
transfers: ['basic'],
objects: Array.from(unique.values(), ({ oid, size }) => ({ oid, size })),
}),
});
} catch {
throw new Error('Git LFS batch request failed');
}
if (!batchResponse.ok) {
throw new Error(`Git LFS batch request failed with HTTP ${batchResponse.status}`);
}
const responseObjects = await parseBatchResponse(batchResponse, unique);
// Validate one upload/verify action: must be an HTTPS URL with string-only
// headers, else treated as absent/invalid.
const actionDetails = (
action: unknown,
): { url: URL; headers: Record<string, string> | undefined } | undefined => {
if (action === undefined) {
return undefined;
}
Iif (!isRecord(action) || typeof action.href !== 'string') {
return undefined;
}
let url: URL;
try {
url = new URL(action.href);
} catch {
return undefined;
}
const headers = action.header;
if (
url.protocol !== 'https:' ||
(headers !== undefined &&
(!isRecord(headers) || !Object.values(headers).every((value) => typeof value === 'string')))
) {
return undefined;
}
return { url, headers: headers as Record<string, string> | undefined };
};
const outcomes = await Promise.all(
Array.from(unique.values(), async (requested): Promise<'uploaded' | 'alreadyPresent'> => {
const object = responseObjects.get(requested.oid);
Iif (!object) {
throw new Error(`Unexpected Git LFS batch response for ${requested.oid}`);
}
const actions = object.actions;
Iif (actions !== undefined && !isRecord(actions)) {
throw new Error(`Unexpected Git LFS batch response for ${requested.oid}`);
}
const uploadAction = isRecord(actions) ? actions.upload : undefined;
if (uploadAction === undefined) {
return 'alreadyPresent';
}
const upload = actionDetails(uploadAction);
const verifyAction = isRecord(actions) ? actions.verify : undefined;
const verify = actionDetails(verifyAction);
if (!upload || (verifyAction !== undefined && !verify)) {
throw new Error(`Unexpected Git LFS batch response for ${requested.oid}`);
}
this.logger.step(`Upload Git LFS object ${requested.oid} (${requested.size} bytes)`);
// Use the action's own headers when given; otherwise fetch credentials
// scoped to the action URL (never reuse the batch host's credentials
// cross-host). Mandatory content headers are set last so an action header
// cannot override them.
const uploadHeaders = upload.headers ?? {
Authorization: this.basicHeader(await this.credentials(upload.url)),
};
let uploadResponse: Response;
try {
uploadResponse = await this.fetchFn(upload.url.href, {
method: 'PUT',
body: requested.content as unknown as BodyInit,
headers: {
...uploadHeaders,
'Content-Type': 'application/octet-stream',
'Content-Length': String(requested.size),
},
});
} catch {
throw new Error('Git LFS upload failed');
}
if (uploadResponse.status < 200 || uploadResponse.status > 299) {
throw new Error(`Git LFS upload failed with HTTP ${uploadResponse.status}`);
}
if (verify) {
const verifyHeaders = verify.headers ?? {
Authorization: this.basicHeader(await this.credentials(verify.url)),
};
let verifyResponse: Response;
try {
verifyResponse = await this.fetchFn(verify.url.href, {
method: 'POST',
headers: {
Accept: 'application/vnd.git-lfs+json',
'Content-Type': 'application/vnd.git-lfs+json',
...verifyHeaders,
},
body: JSON.stringify({ oid: requested.oid, size: requested.size }),
});
} catch {
throw new Error('Git LFS verify failed');
}
if (!verifyResponse.ok) {
throw new Error(`Git LFS verify failed with HTTP ${verifyResponse.status}`);
}
}
this.logger.success(`Uploaded Git LFS object ${requested.oid} (${requested.size} bytes)`);
return 'uploaded';
}),
);
// Reassemble the uploaded / already-present lists in the original input order.
const ordered = Array.from(unique.keys());
const uploaded = ordered.filter((_, index) => outcomes[index] === 'uploaded');
const alreadyPresent = ordered.filter((_, index) => outcomes[index] === 'alreadyPresent');
return { uploaded, alreadyPresent };
}
// Read-only presence check used by dry-run: run the upload batch negotiation
// (which tells us which objects already exist) but never PUT anything.
async queryObjects(
objects: UploadObject[],
): Promise<{ uploadRequired: string[]; alreadyPresent: string[] }> {
const unique = validateAndDeduplicateObjects(objects);
Iif (unique.size === 0) return { uploadRequired: [], alreadyPresent: [] };
const batchUrl = new URL(this.batchEndpoint);
if (batchUrl.protocol !== 'https:') {
throw new Error('Git LFS batch endpoint must use HTTPS');
}
const credentials = await this.credentials(batchUrl, this.credentialHost);
let response: Response;
try {
response = await this.fetchFn(this.batchEndpoint, {
method: 'POST',
headers: {
Accept: 'application/vnd.git-lfs+json',
'Content-Type': 'application/vnd.git-lfs+json',
Authorization: this.basicHeader(credentials),
},
body: JSON.stringify({
operation: 'upload',
transfers: ['basic'],
objects: Array.from(unique.values(), ({ oid, size }) => ({ oid, size })),
}),
});
} catch {
throw new Error('Git LFS batch request failed');
}
Iif (!response.ok) throw new Error(`Git LFS batch request failed with HTTP ${response.status}`);
const responseObjects = await parseBatchResponse(response, unique);
const uploadRequired: string[] = [];
const alreadyPresent: string[] = [];
for (const requested of unique.values()) {
const object = responseObjects.get(requested.oid)!;
if (isRecord(object.actions) && object.actions.upload !== undefined) uploadRequired.push(requested.oid);
else alreadyPresent.push(requested.oid);
}
return { uploadRequired, alreadyPresent };
}
// Build the `git credential fill` query URL, optionally overriding the host
// (used so the batch request authenticates against the configured LFS host).
private credentialUrl(url: URL, hostOverride?: string): URL {
const credentialUrl = new URL(url);
if (hostOverride) {
credentialUrl.host = hostOverride;
}
return credentialUrl;
}
// Resolve Basic credentials via the local `git credential` helper for the
// given URL's protocol/host/path. On any failure, throw a host-only message —
// never surface the helper's output.
private async credentials(url: URL, hostOverride?: string): Promise<Credentials> {
const credentialUrl = this.credentialUrl(url, hostOverride);
const path = credentialUrl.pathname.replace(/^\//, '').replace(/\/objects\/batch\/?$/, '');
const input = [
`protocol=${credentialUrl.protocol.slice(0, -1)}`,
`host=${credentialUrl.host}`,
...(path ? [`path=${path}`] : []),
'',
'',
].join('\n');
let stdout: string;
try {
({ stdout } = await this.execaFn('git', ['credential', 'fill'], {
input,
}));
} catch {
throw new Error(`Git LFS credential unavailable for ${credentialUrl.host}`);
}
const fields = new Map<string, string>();
for (const line of stdout.split(/\r?\n/)) {
const separator = line.indexOf('=');
if (separator > 0) {
fields.set(line.slice(0, separator), line.slice(separator + 1));
}
}
const username = fields.get('username');
const password = fields.get('password');
if (!username || !password) {
throw new Error(`Git LFS credential unavailable for ${credentialUrl.host}`);
}
return { username, password };
}
private basicHeader(credentials: Credentials): string {
return `Basic ${Buffer.from(`${credentials.username}:${credentials.password}`).toString('base64')}`;
}
// Download path for one pointer: negotiate the batch download action, GET the
// bytes, then verify length and SHA-256 against the pointer before returning.
private async download(pointer: GitLfsPointer): Promise<Buffer> {
this.logger.step(`Hydrate Git LFS object ${pointer.oid}`);
const batchUrl = new URL(this.batchEndpoint);
if (batchUrl.protocol !== 'https:') {
throw new Error('Git LFS batch endpoint must use HTTPS');
}
const credentials = await this.credentials(batchUrl, this.credentialHost);
const authorization = this.basicHeader(credentials);
const batchResponse = await this.fetchFn(this.batchEndpoint, {
method: 'POST',
headers: {
Accept: 'application/vnd.git-lfs+json',
'Content-Type': 'application/vnd.git-lfs+json',
Authorization: authorization,
},
body: JSON.stringify({
operation: 'download',
transfers: ['basic'],
objects: [pointer],
}),
});
if (!batchResponse.ok) {
throw new Error(`Git LFS batch request failed with HTTP ${batchResponse.status}`);
}
const batch: unknown = await batchResponse.json();
Iif (!isRecord(batch)) {
throw new Error(`Unexpected Git LFS batch response for ${pointer.oid}`);
}
const objects = batch.objects;
const object = Array.isArray(objects) && objects.length === 1 ? objects[0] : undefined;
const actions = isRecord(object) && isRecord(object.actions) ? object.actions : undefined;
const action = actions && isRecord(actions.download) ? actions.download : undefined;
const actionHeaders = action?.header;
const headersValid =
actionHeaders === undefined ||
(isRecord(actionHeaders) && Object.values(actionHeaders).every((value) => typeof value === 'string'));
let actionUrl: URL | undefined;
if (action && typeof action.href === 'string') {
try {
actionUrl = new URL(action.href);
} catch {
actionUrl = undefined;
}
}
if (
(batch.transfer !== undefined && batch.transfer !== 'basic') ||
!isRecord(object) ||
object.oid !== pointer.oid ||
object.size !== pointer.size ||
object.error ||
!actionUrl ||
actionUrl.protocol !== 'https:' ||
!headersValid
) {
throw new Error(`Unexpected Git LFS batch response for ${pointer.oid}`);
}
const downloadHeaders =
actionHeaders === undefined
? { Authorization: this.basicHeader(await this.credentials(actionUrl)) }
: (actionHeaders as Record<string, string>);
const downloadResponse = await this.fetchFn(actionUrl.href, {
headers: downloadHeaders,
});
Iif (!downloadResponse.ok) {
throw new Error(`Git LFS download failed with HTTP ${downloadResponse.status}`);
}
const content = Buffer.from(await downloadResponse.arrayBuffer());
if (content.length !== pointer.size) {
throw new Error(`Git LFS size mismatch for ${pointer.oid}`);
}
const oid = createHash('sha256').update(content).digest('hex');
if (oid !== pointer.oid) {
throw new Error(`Git LFS SHA-256 mismatch for ${pointer.oid}`);
}
this.logger.success(`Hydrated Git LFS object ${pointer.oid} (${pointer.size} bytes)`);
return content;
}
}
function isRecord(value: unknown): value is Record<string, unknown> {
return typeof value === 'object' && value !== null && !Array.isArray(value);
}
|