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import { getSignedUrl } from "@aws-sdk/s3-request-presigner";
import { APIGatewayEvent } from "aws-lambda";
import { response } from "libs/handler-lib";
import { getDomain } from "libs/utils";
import {
getAttachmentErrorMessage,
isAttachmentNotFoundError,
isLegacyAttachmentUnavailableError,
} from "../attachment-archive/attachment-errors";
import {
createAttachmentBucketClientFactory,
getAttachmentBucketMap,
resolveTargetBucket as resolveMappedBucket,
} from "../attachment-archive/bucket-routing";
import { getStateFilter } from "../libs/api/auth/user";
import { getPackage, getPackageChangelog } from "../libs/api/package";
import { handleOpensearchError } from "./utils";
function getClient(bucket: string) {
return createAttachmentBucketClientFactory({
region: process.env.region || process.env.AWS_REGION,
legacyS3AccessRoleArn: process.env.legacyS3AccessRoleArn,
})(bucket);
}
class AttachmentUnavailableError extends Error {
statusCode = 410;
constructor(message: string) {
super(message);
this.name = "AttachmentUnavailableError";
}
}
function logRemapApplied({
packageId,
sourceBucket,
destinationBucket,
key,
filename,
}: {
packageId: string;
sourceBucket: string;
destinationBucket: string;
key: string;
filename: string;
}) {
console.info(
JSON.stringify({
event: "legacy_attachment_remap_applied",
packageId,
sourceBucket,
destinationBucket,
key,
filename,
}),
);
}
function logRemapMissingMapping({
packageId,
sourceBucket,
key,
filename,
}: {
packageId: string;
sourceBucket: string;
key: string;
filename: string;
}) {
console.warn(
JSON.stringify({
event: "legacy_attachment_remap_missing_mapping",
packageId,
sourceBucket,
key,
filename,
}),
);
}
function logRemapFallback({
packageId,
sourceBucket,
destinationBucket,
key,
filename,
reason,
}: {
packageId: string;
sourceBucket: string;
destinationBucket: string;
key: string;
filename: string;
reason: string;
}) {
console.warn(
JSON.stringify({
event: "legacy_attachment_remap_fallback",
packageId,
sourceBucket,
destinationBucket,
key,
filename,
reason,
}),
);
}
function logAttachmentUnavailable({
packageId,
sourceBucket,
destinationBucket,
key,
filename,
reason,
}: {
packageId: string;
sourceBucket: string;
destinationBucket?: string;
key: string;
filename: string;
reason: string;
}) {
console.warn(
JSON.stringify({
event: "legacy_attachment_unavailable",
packageId,
sourceBucket,
destinationBucket,
key,
filename,
reason,
}),
);
}
function resolveTargetBucket(
packageId: string,
sourceBucket: string,
key: string,
filename: string,
): { sourceBucket: string; destinationBucket: string; remapped: boolean } {
const attachmentBucketMap = getAttachmentBucketMap(
process.env.LEGACY_ATTACHMENT_BUCKET_MAP,
(message) =>
console.warn(
JSON.stringify({
event: "legacy_attachment_bucket_map_invalid",
message,
}),
),
);
const bucketResolution = resolveMappedBucket(sourceBucket, attachmentBucketMap);
if (bucketResolution.remapped) {
logRemapApplied({
packageId,
sourceBucket,
destinationBucket: bucketResolution.destinationBucket,
key,
filename,
});
return bucketResolution;
}
Eif (sourceBucket.startsWith("uploads")) {
logRemapMissingMapping({
packageId,
sourceBucket,
key,
filename,
});
}
return {
sourceBucket: bucketResolution.sourceBucket,
destinationBucket: bucketResolution.destinationBucket,
remapped: bucketResolution.remapped,
};
}
// Handler function to get Seatool data
export const handler = async (event: APIGatewayEvent) => {
try {
getDomain();
} catch (error) {
return response({
statusCode: 500,
body: { message: `ERROR: ${error?.message || error}` },
});
}
if (!event.body) {
return response({
statusCode: 400,
body: { message: "Event body required" },
});
}
try {
const body = JSON.parse(event.body);
const mainResult = await getPackage(body.id);
if (!mainResult || !mainResult.found) {
return response({
statusCode: 404,
body: { message: "No record found for the given id" },
});
}
const stateFilter = await getStateFilter(event);
Eif (stateFilter) {
const stateAccessAllowed = stateFilter?.terms.state.includes(
mainResult?._source?.state?.toLocaleLowerCase() || "",
);
if (!stateAccessAllowed) {
return response({
statusCode: 403,
body: { message: "state access not permitted for the given id" },
});
}
}
// add state
// Do we want to check
const changelogs = await getPackageChangelog(body.id);
const attachmentExists = changelogs.hits.hits.some((CL) => {
return CL._source.attachments?.some(
(ATT) => ATT.bucket === body.bucket && ATT.key === body.key,
);
});
if (!attachmentExists) {
return response({
statusCode: 500,
body: {
message: "Attachment details not found for given record id.",
},
});
}
const bucketResolution = resolveTargetBucket(body.id, body.bucket, body.key, body.filename);
const bucketToSign = await resolveDownloadBucket({
packageId: body.id,
sourceBucket: bucketResolution.sourceBucket,
destinationBucket: bucketResolution.destinationBucket,
remapped: bucketResolution.remapped,
key: body.key,
filename: body.filename,
});
// Now we can generate the presigned url
const url = await generatePresignedUrl(bucketToSign, body.key, body.filename, 60);
return response<unknown>({
statusCode: 200,
body: { url },
});
} catch (error) {
if (error instanceof AttachmentUnavailableError) {
return response({
statusCode: error.statusCode,
body: { message: error.message },
});
}
return response(handleOpensearchError(error));
}
};
async function resolveDownloadBucket({
packageId,
sourceBucket,
destinationBucket,
remapped,
key,
filename,
}: {
packageId: string;
sourceBucket: string;
destinationBucket: string;
remapped: boolean;
key: string;
filename: string;
}) {
if (remapped) {
try {
await assertObjectAccessible(destinationBucket, key);
return destinationBucket;
} catch (error) {
if (!isAttachmentNotFoundError(error)) {
throw error;
}
logRemapFallback({
packageId,
sourceBucket,
destinationBucket,
key,
filename,
reason: error instanceof Error ? error.message : String(error),
});
}
}
try {
await assertObjectAccessible(sourceBucket, key);
return sourceBucket;
} catch (error) {
const attachmentUnavailable =
isAttachmentNotFoundError(error) || isLegacyAttachmentUnavailableError(sourceBucket, error);
if (!attachmentUnavailable) {
throw error;
}
logAttachmentUnavailable({
packageId,
sourceBucket,
destinationBucket: remapped ? destinationBucket : undefined,
key,
filename,
reason: getAttachmentErrorMessage(error),
});
throw new AttachmentUnavailableError("This attachment is no longer available.");
}
}
async function assertObjectAccessible(bucket: string, key: string) {
const client = await getClient(bucket);
await client.send(
new HeadObjectCommand({
Bucket: bucket,
Key: key,
}),
);
}
function getAsciiFilename(filename: string) {
const sanitized = filename
.normalize("NFKD")
.replace(/[^\x20-\x7E]+/g, "_")
.replace(/["\\]/g, "_")
.trim();
return sanitized || "download";
}
function encodeContentDispositionFilename(filename: string) {
return encodeURIComponent(filename).replace(
/['()*]/g,
(char) => `%${char.charCodeAt(0).toString(16).toUpperCase()}`,
);
}
function buildResponseContentDisposition(filename: string) {
const asciiFilename = getAsciiFilename(filename);
const encodedFilename = encodeContentDispositionFilename(filename);
return `attachment; filename="${asciiFilename}"; filename*=UTF-8''${encodedFilename}`;
}
async function generatePresignedUrl(
bucket: string,
key: string,
filename: string,
expirationInSeconds: number,
) {
// Get an S3 client
const client = await getClient(bucket);
// Create a command to get the object (you can adjust this according to your use case)
const getObjectCommand = new GetObjectCommand({
Bucket: bucket,
Key: key,
ResponseContentDisposition: buildResponseContentDisposition(filename),
});
// Generate a presigned URL
const presignedUrl = await getSignedUrl(client, getObjectCommand, {
expiresIn: expirationInSeconds,
});
return presignedUrl;
}
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