46 lines
1.7 KiB
TypeScript
46 lines
1.7 KiB
TypeScript
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export function registerEscapeHandler(outsideContainer: HTMLElement | null, cb: () => void) {
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if (!outsideContainer) return
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function click(this: HTMLElement, e: HTMLElementEventMap["click"]) {
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if (e.target !== this) return
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e.preventDefault()
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e.stopPropagation()
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cb()
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}
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function esc(e: HTMLElementEventMap["keydown"]) {
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if (!e.key.startsWith("Esc")) return
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e.preventDefault()
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cb()
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}
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outsideContainer?.addEventListener("click", click)
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window.addCleanup(() => outsideContainer?.removeEventListener("click", click))
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document.addEventListener("keydown", esc)
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window.addCleanup(() => document.removeEventListener("keydown", esc))
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}
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export function removeAllChildren(node: HTMLElement) {
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while (node.firstChild) {
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node.removeChild(node.firstChild)
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}
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}
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// AliasRedirect emits HTML redirects which also have the link[rel="canonical"]
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// containing the URL it's redirecting to.
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// Extracting it here with regex is _probably_ faster than parsing the entire HTML
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// with a DOMParser effectively twice (here and later in the SPA code), even if
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// way less robust - we only care about our own generated redirects after all.
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const canonicalRegex = /<link rel="canonical" href="([^"]*)">/
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export async function fetchCanonical(url: URL): Promise<Response> {
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const res = await fetch(`${url}`)
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if (!res.headers.get("content-type")?.startsWith("text/html")) {
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return res
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}
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// reading the body can only be done once, so we need to clone the response
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// to allow the caller to read it if it's was not a redirect
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const text = await res.clone().text()
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const [_, redirect] = text.match(canonicalRegex) ?? []
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return redirect ? fetch(redirect) : res
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}
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