astro/dist/core/cache/runtime/utils.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

/**
* Generate default cache response headers from CacheOptions.
* Used when the provider doesn't supply its own `setHeaders()`.
*/
export function defaultSetHeaders(options) {
	const headers = new Headers();
	// CDN-Cache-Control
	const directives = [];
	if (options.maxAge !== undefined) {
		directives.push(`max-age=${options.maxAge}`);
	}
	if (options.swr !== undefined) {
		directives.push(`stale-while-revalidate=${options.swr}`);
	}
	if (directives.length > 0) {
		headers.set("CDN-Cache-Control", directives.join(", "));
	}
	// Cache-Tag
	if (options.tags && options.tags.length > 0) {
		headers.set("Cache-Tag", options.tags.join(", "));
	}
	// Last-Modified
	if (options.lastModified) {
		headers.set("Last-Modified", options.lastModified.toUTCString());
	}
	// ETag
	if (options.etag) {
		headers.set("ETag", options.etag);
	}
	return headers;
}
export function isCacheHint(value) {
	return value != null && typeof value === "object" && "tags" in value;
}
export function isLiveDataEntry(value) {
	return value != null && typeof value === "object" && "id" in value && "data" in value && "cacheHint" in value;
}