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import { response } from "libs/handler-lib";
import { opensearch } from "shared-types";
import { sendAttachmentArchiveRebuildRequest } from "../attachment-archive/rebuild-queue";
import { getPackage, getPackageChangelog } from "../libs/api/package";
import { getRequestedAttachmentArchiveDownload } from "./attachmentArchive-lib";
import {
getActiveClient,
getExternalApiAuthConfig,
isClientAllowedForObject,
} from "./external-auth";
import { generatePresignedDownloadUrl, isS3ObjectAccessError } from "./presignedAttachmentUrl";
const DEFAULT_EXPIRATION_SECONDS = 60;
const MAX_EXPIRATION_SECONDS = 604800;
const DEFAULT_ARCHIVE_ERROR_MESSAGE = "Unable to prepare the attachment archive.";
type AttachmentRequestBody = {
bucket?: unknown;
key?: unknown;
objectName?: unknown;
filename?: unknown;
fileName?: unknown;
expiresIn?: unknown;
packageId?: unknown;
sectionId?: unknown;
section?: unknown;
};
type ParsedObjectRequest = {
mode: "object";
bucket: string;
key: string;
filename: string;
expiresIn: number;
};
type ParsedArchiveRequest = {
mode: "archive";
expiresIn: number;
packageId: string;
sectionId?: string;
};
type ParsedRequest = ParsedObjectRequest | ParsedArchiveRequest;
type ErrorResponse = ReturnType<typeof badRequest>;
function badRequest(message: string) {
return response({
statusCode: 400,
body: { message },
});
}
function defaultFilenameFromKey(key: string) {
const normalizedKey = key.replace(/\/+$/, "");
const keySegments = normalizedKey.split("/");
return keySegments[keySegments.length - 1] || normalizedKey;
}
function parseExpiresIn(expiresIn: unknown): number | ErrorResponse {
if (expiresIn === undefined) {
return DEFAULT_EXPIRATION_SECONDS;
}
if (
typeof expiresIn !== "number" ||
!Number.isInteger(expiresIn) ||
expiresIn < 1 ||
expiresIn > MAX_EXPIRATION_SECONDS
) {
return badRequest(`expiresIn must be an integer between 1 and ${MAX_EXPIRATION_SECONDS}.`);
}
return expiresIn;
}
function parseOptionalSectionId(body: AttachmentRequestBody): string | undefined | ErrorResponse {
const rawSectionId = body.sectionId;
const rawSection = body.section;
if (rawSectionId !== undefined && rawSection !== undefined && rawSectionId !== rawSection) {
return badRequest("section and sectionId must match when both are provided.");
}
const sectionValue = rawSectionId ?? rawSection;
if (sectionValue === undefined) {
return undefined;
}
Iif (typeof sectionValue !== "string" || sectionValue.trim() === "") {
return badRequest("sectionId must be a non-empty string when provided.");
}
return sectionValue.trim();
}
function isObjectLocatorFieldPresent(body: AttachmentRequestBody): boolean {
return [body.bucket, body.key, body.objectName, body.filename, body.fileName].some(
(value) => value !== undefined,
);
}
function parseObjectRequest(body: AttachmentRequestBody): ParsedObjectRequest | ErrorResponse {
if (typeof body.bucket !== "string" || body.bucket.trim() === "") {
return badRequest("bucket is required.");
}
const keyCandidate = body.key ?? body.objectName ?? body.filename ?? body.fileName;
if (typeof keyCandidate !== "string" || keyCandidate.trim() === "") {
return badRequest("key is required.");
}
const expiresIn = parseExpiresIn(body.expiresIn);
Iif (isErrorResponse(expiresIn)) {
return expiresIn;
}
const normalizedKey = keyCandidate.trim();
const rawFilename = body.filename ?? body.fileName;
let filename = defaultFilenameFromKey(normalizedKey);
if (rawFilename !== undefined) {
Iif (typeof rawFilename !== "string" || rawFilename.trim() === "") {
return badRequest("filename must be a non-empty string when provided.");
}
filename = rawFilename.trim();
}
return {
mode: "object",
bucket: body.bucket.trim(),
key: normalizedKey,
filename,
expiresIn,
};
}
function parseArchiveRequest(
body: AttachmentRequestBody,
sectionId: string | undefined,
): ParsedArchiveRequest | ErrorResponse {
if (typeof body.packageId !== "string" || body.packageId.trim() === "") {
return badRequest("packageId is required when requesting an archive.");
}
const expiresIn = parseExpiresIn(body.expiresIn);
if (isErrorResponse(expiresIn)) {
return expiresIn;
}
return {
mode: "archive",
expiresIn,
packageId: body.packageId.trim(),
...(sectionId ? { sectionId } : {}),
};
}
function parseRequestBody(event: APIGatewayProxyEvent): ParsedRequest | ErrorResponse {
if (!event.body) {
return badRequest("Request body is required.");
}
let body: AttachmentRequestBody;
try {
body = JSON.parse(event.body);
} catch {
return badRequest("Invalid JSON payload.");
}
const sectionId = parseOptionalSectionId(body);
if (isErrorResponse(sectionId)) {
return sectionId;
}
if (isObjectLocatorFieldPresent(body)) {
if (sectionId) {
return badRequest("sectionId cannot be combined with bucket/key attachment requests.");
}
return parseObjectRequest(body);
}
return parseArchiveRequest(body, sectionId);
}
function getClientIdFromAuthorizer(event: APIGatewayProxyEvent): string | null {
const authorizer = event.requestContext.authorizer;
Iif (!authorizer || typeof authorizer !== "object") {
return null;
}
const clientId = (authorizer as Record<string, unknown>).clientId;
return typeof clientId === "string" && clientId.trim() ? clientId : null;
}
function isErrorResponse(value: unknown): value is ErrorResponse {
return (
typeof value === "object" &&
value !== null &&
"statusCode" in value &&
typeof (value as { statusCode?: unknown }).statusCode === "number"
);
}
function getLatestChangelogTimestamp(changelog: Array<{ _source?: { timestamp?: number } }>) {
return changelog.reduce<number | undefined>((latest, item) => {
const timestamp = item._source?.timestamp;
Iif (typeof timestamp !== "number") {
return latest;
}
return latest === undefined ? timestamp : Math.max(latest, timestamp);
}, undefined);
}
function getKnownErrorResponse(error: unknown) {
const statusCode =
typeof error === "object" &&
error !== null &&
"statusCode" in error &&
typeof (error as { statusCode?: unknown }).statusCode === "number"
? (error as { statusCode: number }).statusCode
: undefined;
if (!statusCode) {
return undefined;
}
const rawMessage =
typeof error === "object" &&
error !== null &&
"message" in error &&
typeof (error as { message?: unknown }).message === "string"
? (error as { message: string }).message
: undefined;
Iif (!rawMessage) {
return response({
statusCode,
body: { message: "Request failed." },
});
}
try {
const parsed = JSON.parse(rawMessage) as { message?: string };
Eif (typeof parsed.message === "string" && parsed.message) {
return response({
statusCode,
body: { message: parsed.message },
});
}
} catch {
// Fall through to use the raw message.
}
return response({
statusCode,
body: { message: rawMessage },
});
}
async function handleArchiveRequest({
client,
request,
}: {
client: NonNullable<ReturnType<typeof getActiveClient>>;
request: ParsedArchiveRequest;
}) {
const mainResult = await getPackage(request.packageId);
if (!mainResult || !mainResult.found) {
return response({
statusCode: 404,
body: { message: "No record found for the given packageId" },
});
}
const changelogResponse = await getPackageChangelog(request.packageId);
const changelog = changelogResponse.hits.hits as opensearch.changelog.ItemResult[];
const archiveResult = await getRequestedAttachmentArchiveDownload({
packageId: request.packageId,
scope: request.sectionId ? "section" : "all",
sectionId: request.sectionId,
changelog,
});
if (archiveResult.response.status === "FAILED") {
return response({
statusCode: 409,
body: {
message: archiveResult.response.message || DEFAULT_ARCHIVE_ERROR_MESSAGE,
},
});
}
if (archiveResult.response.status === "PENDING") {
Eif (archiveResult.needsRebuild) {
await sendAttachmentArchiveRebuildRequest({
packageId: request.packageId,
latestTimestamp: getLatestChangelogTimestamp(changelog),
source: "request",
});
}
return response({
statusCode: 200,
body: {
status: "PENDING",
pollAfterSeconds: archiveResult.response.pollAfterSeconds,
packageId: request.packageId,
...(request.sectionId ? { sectionId: request.sectionId } : {}),
},
});
}
if (
!isClientAllowedForObject(
client,
archiveResult.response.bucketName,
archiveResult.response.artifactKey,
)
) {
return response({
statusCode: 403,
body: { message: "Client is not allowed to access the requested object." },
});
}
const url = await generatePresignedDownloadUrl(
archiveResult.response.bucketName,
archiveResult.response.artifactKey,
archiveResult.response.filename,
request.expiresIn,
{
validateObjectAccess: true,
},
);
return response({
statusCode: 200,
body: {
status: "READY",
target: request.sectionId ? "sectionArchive" : "packageArchive",
filename: archiveResult.response.filename,
url,
expiresIn: request.expiresIn,
...(archiveResult.response.warningMessage
? { warningMessage: archiveResult.response.warningMessage }
: {}),
},
});
}
export const handler = async (event: APIGatewayProxyEvent) => {
const parsedRequest = parseRequestBody(event);
if (isErrorResponse(parsedRequest)) {
return parsedRequest;
}
const clientId = getClientIdFromAuthorizer(event);
if (!clientId) {
return response({
statusCode: 401,
body: { message: "Unauthorized" },
});
}
try {
const config = await getExternalApiAuthConfig();
const client = getActiveClient(config, clientId);
if (!client || !client.grants.includes("client_credentials")) {
return response({
statusCode: 403,
body: { message: "Client is not authorized for this endpoint." },
});
}
if (parsedRequest.mode === "archive") {
return await handleArchiveRequest({
client,
request: parsedRequest,
});
}
if (!isClientAllowedForObject(client, parsedRequest.bucket, parsedRequest.key)) {
return response({
statusCode: 403,
body: { message: "Client is not allowed to access the requested object." },
});
}
const url = await generatePresignedDownloadUrl(
parsedRequest.bucket,
parsedRequest.key,
parsedRequest.filename,
parsedRequest.expiresIn,
{
validateObjectAccess: true,
},
);
return response({
statusCode: 200,
body: {
status: "READY",
target: "object",
filename: parsedRequest.filename,
url,
expiresIn: parsedRequest.expiresIn,
},
});
} catch (error) {
if (isS3ObjectAccessError(error)) {
if (error.s3Status === 403) {
return response({
statusCode: 403,
body: { message: "Access to the requested S3 object is denied." },
});
}
Eif (error.s3Status === 404) {
return response({
statusCode: 404,
body: { message: "Requested S3 object was not found." },
});
}
}
const knownErrorResponse = getKnownErrorResponse(error);
if (knownErrorResponse) {
return knownErrorResponse;
}
return response({
statusCode: 500,
body: { message: "Internal server error." },
});
}
};
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