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import { gitlab, GitLabApiError } from '../../utils/gitlab-api';
import { getGitLabBaseUrl } from '../../utils/gitlab-base-url';
import { normalizeProjectId } from '../../utils/projectIdentifier';
import { encodeApiSegment } from '../../utils/api-path';
import { parseRetryAfterSeconds } from '../../utils/retry-after';
import { BODY_TIMEOUT_MS } from '../../config';
import { StructuredToolError, type ArtifactReadRefusal } from '../../utils/error-handler';
import { currentMcpAbortSignal } from '../../mcp-server-context';
import { encodeArtifactPath, ARTIFACT_MAX_BYTES, ARTIFACT_MAX_OFFSET } from './artifact-path';
import { readArtifactWindow, ArtifactReadError } from './artifact-window';
interface ArtifactInput {
project_id: string;
job_id: string;
artifact_path: string;
byte_offset: number;
byte_limit: number;
}
/** Validate a provider redirect before connecting, without retaining invalid signed URL data. */
export function resolveArtifactRedirect(target: URL, location: string): URL {
let next: URL;
try {
next = new URL(location, target);
} catch {
throw new Error('Artifact server returned an invalid redirect URL');
}
if (
!['http:', 'https:'].includes(next.protocol) ||
next.username ||
next.password ||
next.hash ||
(target.protocol === 'https:' && next.protocol !== 'https:')
) {
throw new Error('Artifact server returned an unsafe redirect');
}
return next;
}
/** A browser link is derived from GitLab's job URL, not from a signed storage URL. */
export function artifactViewUrl(jobUrl: string, encodedPath: string): string {
let view: URL;
try {
view = new URL(jobUrl);
} catch {
throw new Error('GitLab returned an invalid artifact-view URL');
}
if (!['http:', 'https:'].includes(view.protocol) || view.username || view.password) {
throw new Error('GitLab returned an invalid artifact-view URL');
}
view.pathname += `/artifacts/file/${encodedPath}`;
view.search = '';
view.hash = '';
return view.toString();
}
/** The configured GitLab supplies download locations; a caller never supplies an origin. */
async function artifactResponse(url: string, offset: number, limit: number) {
let target = new URL(url);
const origin = target.origin;
let external = false;
// Fetch's redirect limit: https://fetch.spec.whatwg.org/#http-redirect-fetch
for (let redirects = 0; redirects <= 20; redirects++) {
const response = await enhancedFetch(target.toString(), {
rawBody: true,
redirect: 'manual',
skipAuth: external,
redactQuery: true,
signal: currentMcpAbortSignal(),
rateLimitBaseUrl: external ? target.origin : getGitLabBaseUrl(),
rateLimit: !external,
headers: {
Accept: '*/*',
'Accept-Encoding': 'identity',
Range: `bytes=${offset}-${offset + limit + 3}`,
},
});
if (![301, 302, 303, 307, 308].includes(response.status)) return { response, external };
const location = response.headers.get('location');
// Each redirect depends on this response; finish cancellation before following its Location.
await response.body?.cancel();
if (!location) throw new Error('Artifact redirect has no Location');
const next = resolveArtifactRedirect(target, location);
external ||= next.origin !== origin;
target = next;
}
throw new Error('Artifact server exceeded the redirect limit');
}
/** Read only the requested artifact file, retaining bytes for one UTF-8 window. */
export async function readArtifactFile(input: ArtifactInput) {
const { project_id, job_id, artifact_path, byte_offset, byte_limit } = input;
const encodedPath = encodeArtifactPath(artifact_path);
const project = normalizeProjectId(project_id);
const job = encodeApiSegment(job_id);
const url = `${getGitLabBaseUrl()}/api/v4/projects/${project}/jobs/${job}/artifacts/${encodedPath}`;
const { response, external } = await artifactResponse(url, byte_offset, byte_limit);
try {
assertDownloadStatus(response, external, input);
return {
project_id,
job_id,
artifact_path,
...(await readArtifactWindow(response, byte_offset, byte_limit)),
};
} catch (error) {
if (error instanceof Error && 'code' in error && error.code === 'UND_ERR_BODY_TIMEOUT') {
throw new GitLabTimeoutError('body', BODY_TIMEOUT_MS, error);
}
if (error instanceof ArtifactReadError) {
await discardUnreadBody(response);
let viewUrl: string | undefined;
if (error.reason === 'not_text') {
// Resolve a canonical browser link only for the refusal, not for every successful window.
const metadata = await gitlab.get<{ web_url: string }>(`projects/${project}/jobs/${job}`);
viewUrl = artifactViewUrl(metadata.web_url, encodedPath);
}
throw refusal(input, error.reason, error.message, {
...(viewUrl !== undefined && { artifact_view_url: viewUrl }),
});
}
throw error;
} finally {
await discardUnreadBody(response);
}
}
async function discardUnreadBody(response: Response): Promise<void> {
if (!response.bodyUsed && !response.body?.locked) await response.body?.cancel();
}
function assertDownloadStatus(response: Response, external: boolean, input: ArtifactInput): void {
if (response.ok || response.status === 416) return;
if (external) {
throw refusal(
input,
'storage_http_error',
`Artifact storage returned HTTP ${response.status}`,
{ http_status: response.status },
);
}
const wait =
response.status === 429
? parseRetryAfterSeconds(response.headers.get('retry-after'), Date.now())
: null;
throw new GitLabApiError(
response.status,
'',
`GitLab API error: ${response.status} ${response.statusText}`,
wait === null ? undefined : Math.ceil(wait),
);
}
function refusal(
input: ArtifactInput,
reason: string,
message: string,
details: Pick<ArtifactReadRefusal, 'artifact_view_url' | 'http_status'>,
): StructuredToolError {
return new StructuredToolError({
error_code: 'ARTIFACT_READ_REFUSED',
reason,
message,
tool: 'browse_pipelines',
action: 'artifact_file',
project_id: input.project_id,
job_id: input.job_id,
artifact_path: input.artifact_path,
max_window_bytes: ARTIFACT_MAX_BYTES,
max_prefix_bytes: ARTIFACT_MAX_OFFSET,
...details,
});
}
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