90 lines
2.2 KiB
JavaScript
90 lines
2.2 KiB
JavaScript
import defu from 'defu';
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const DefaultOptions = {
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statusCode: 404,
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skipUnknown: false,
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cacheHeaders: true,
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placeholderHeader: true,
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handlers: {
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".css": "css",
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".html": "html",
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".htm": "html",
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".png": "image",
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".jpg": "image",
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".jpeg": "image",
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".gif": "image",
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".svg": "image",
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".webp": "image",
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".bmp": "image",
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".ico": "image",
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".js": "js",
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".json": "json",
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".map": "map",
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".txt": "plain",
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".text": "plain",
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".md": "plain"
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},
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placeholders: {
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css: "/* style not found */",
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default: void 0,
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html: "<!-- page not found -->",
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image: "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",
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js: "/* script not found */",
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json: "{}",
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map: '{"version": "3", "sources": [], "mappings": "" }',
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plain: ""
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},
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mimes: {
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css: "text/css",
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default: void 0,
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html: "text/html",
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js: "application/javascript",
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json: "application/json",
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image: "image/gif",
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map: "application/json",
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plain: "text/plain"
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}
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};
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const EXT_REGEX = /\.[a-zA-Z0-9]+$/;
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function servePlaceholder(_options = {}) {
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const options = defu(_options, DefaultOptions);
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return function servePlaceholderMiddleware(req, res, next) {
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if (res.writableEnded) {
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return;
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}
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const url = req.url.split("?")[0];
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const ext = (url.match(EXT_REGEX) || [])[0] || "";
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let handler = options.handlers[ext];
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if (handler === false) {
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return next();
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}
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if (typeof handler === "undefined") {
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if (options.skipUnknown) {
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return next();
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} else {
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handler = "default";
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}
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}
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if (options.statusCode) {
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res.statusCode = options.statusCode;
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}
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const mime = options.mimes[handler];
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if (mime) {
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res.setHeader("Content-Type", mime);
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}
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if (options.cacheHeaders) {
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res.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
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res.setHeader("Pragma", "no-cache");
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res.setHeader("Expires", "0");
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}
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if (options.placeholderHeader) {
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res.setHeader("X-Placeholder", handler);
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}
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const placeholder = options.placeholders[handler];
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res.end(placeholder);
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};
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}
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export { servePlaceholder };
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