1 files changed, 63 insertions, 0 deletions
diff --git a/packages/astro/src/assets/utils/remotePattern.ts b/packages/astro/src/assets/utils/remotePattern.ts
new file mode 100644
index 000000000..7708b42e7
--- /dev/null
+++ b/packages/astro/src/assets/utils/remotePattern.ts
@@ -0,0 +1,63 @@
+export type RemotePattern = {
+	hostname?: string;
+	pathname?: string;
+	protocol?: string;
+	port?: string;
+};
+
+export function matchPattern(url: URL, remotePattern: RemotePattern) {
+	return (
+		matchProtocol(url, remotePattern.protocol) &&
+		matchHostname(url, remotePattern.hostname, true) &&
+		matchPort(url, remotePattern.port) &&
+		matchPathname(url, remotePattern.pathname, true)
+	);
+}
+
+export function matchPort(url: URL, port?: string) {
+	return !port || port === url.port;
+}
+
+export function matchProtocol(url: URL, protocol?: string) {
+	return !protocol || protocol === url.protocol.slice(0, -1);
+}
+
+export function matchHostname(url: URL, hostname?: string, allowWildcard?: boolean) {
+	if (!hostname) {
+		return true;
+	} else if (!allowWildcard || !hostname.startsWith('*')) {
+		return hostname === url.hostname;
+	} else if (hostname.startsWith('**.')) {
+		const slicedHostname = hostname.slice(2); // ** length
+		return slicedHostname !== url.hostname && url.hostname.endsWith(slicedHostname);
+	} else if (hostname.startsWith('*.')) {
+		const slicedHostname = hostname.slice(1); // * length
+		const additionalSubdomains = url.hostname
+			.replace(slicedHostname, '')
+			.split('.')
+			.filter(Boolean);
+		return additionalSubdomains.length === 1;
+	}
+
+	return false;
+}
+
+export function matchPathname(url: URL, pathname?: string, allowWildcard?: boolean) {
+	if (!pathname) {
+		return true;
+	} else if (!allowWildcard || !pathname.endsWith('*')) {
+		return pathname === url.pathname;
+	} else if (pathname.endsWith('/**')) {
+		const slicedPathname = pathname.slice(0, -2); // ** length
+		return slicedPathname !== url.pathname && url.pathname.startsWith(slicedPathname);
+	} else if (pathname.endsWith('/*')) {
+		const slicedPathname = pathname.slice(0, -1); // * length
+		const additionalPathChunks = url.pathname
+			.replace(slicedPathname, '')
+			.split('/')
+			.filter(Boolean);
+		return additionalPathChunks.length === 1;
+	}
+
+	return false;
+}