"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getBucketLocation = getBucketLocation;
const aws4_1 = require("aws4");
const https_1 = require("https");
const awsCredentials_1 = require("./awsCredentials");
/**
* Resolves the AWS region for a bucket via the S3 GetBucketLocation API (SigV4-signed).
* Uses path-style endpoint so dotted bucket names pass TLS hostname validation.
* Credentials are resolved via the standard provider chain (env vars → ~/.aws/credentials).
* AWS returns an empty LocationConstraint element for us-east-1 (the implicit default region).
* Mirrors the behaviour of the `get-bucket-location` app-builder subcommand.
*/
function getBucketLocation(bucket) {
return new Promise((resolve, reject) => {
let settled = false;
const settle = (fn, v) => {
if (!settled) {
settled = true;
fn(v);
}
};
const opts = (0, aws4_1.sign)({
service: "s3",
region: "us-east-1",
method: "GET",
host: "s3.amazonaws.com",
path: `/${bucket}?location`,
}, (0, awsCredentials_1.resolveAwsCredentials)());
const req = (0, https_1.request)({
hostname: opts.host,
path: opts.path,
method: opts.method,
headers: opts.headers,
}, res => {
let body = "";
let bodySize = 0;
const MAX_BODY = 65536;
res.on("data", (chunk) => {
bodySize += chunk.length;
if (bodySize > MAX_BODY) {
req.destroy();
settle(reject, new Error("GetBucketLocation response too large"));
return;
}
body += chunk;
});
res.on("end", () => {
if (res.statusCode !== 200) {
settle(reject, new Error(`GetBucketLocation failed (HTTP ${res.statusCode}): ${body}`));
return;
}
// Response: <LocationConstraint>us-west-2</LocationConstraint> or empty element for us-east-1
const match = body.match(/<LocationConstraint[^>]*>([^<]*)<\/LocationConstraint>/);
const rawRegion = (match === null || match === void 0 ? void 0 : match[1]) || "";
// "EU" is the only non-standard token GetBucketLocation ever returns — a legacy alias
// for eu-west-1 used by buckets created before August 2014. Simple lowercasing is not
// sufficient because "eu" is not a valid region identifier.
const region = rawRegion === "EU" ? "eu-west-1" : rawRegion;
if (region !== "" && !/^[a-z][a-z0-9-]+$/.test(region)) {
settle(reject, new Error(`GetBucketLocation returned unexpected region: ${region}`));
return;
}
settle(resolve, region || "us-east-1");
});
});
req.on("error", e => settle(reject, e));
req.end();
});
}
//# sourceMappingURL=bucketLocation.js.map