Harden OAuth provider icon loading

src/components/ui/icon.tsx

@@ -1,6 +1,15 @@
 import { useEffect, useState } from "react"
 
 type SVGProps = React.ComponentPropsWithoutRef<"svg">
+type IconMarkupState =
+    | { status: "ready"; icon: ParsedIconMarkup }
+    | { status: "missing" }
+
+type ParsedIconMarkup = {
+    title?: string
+    viewBox: string
+    path: string
+}
 
 const simpleIconModules = import.meta.glob("/node_modules/simple-icons/icons/*.svg", {
     query: "?raw",
@@ -14,7 +23,7 @@ const iconLoadersBySlug = Object.fromEntries(
     ]),
 )
 
-const iconMarkupCache = new Map<string, string | null>()
+const iconMarkupCache = new Map<string, IconMarkupState>()
 
 function toProviderSlug(provider: string) {
     return provider.trim().replace(/[^a-z0-9]+/gi, "").toLowerCase()
@@ -25,15 +34,30 @@ function loadProviderIconMarkup(provider: string) {
     return loader ? loader() : null
 }
 
-function getSvgViewBox(markup: string) {
-    return markup.match(/viewBox="([^"]+)"/i)?.[1] ?? "0 0 24 24"
+function parseIconMarkup(markup: string): ParsedIconMarkup | null {
+    const viewBox = markup.match(/viewBox="([^"]+)"/i)?.[1] ?? "0 0 24 24"
+    const title = markup.match(/<title>([^<]*)<\/title>/i)?.[1]
+    const path = markup.match(/<path d="([^"]+)"/i)?.[1]
+
+    if (!path) {
+        return null
     }
 
-function getSvgInnerMarkup(markup: string) {
-    return markup
-        .replace(/^<svg[^>]*>/i, "")
-        .replace(/<\/svg>\s*$/i, "")
-        .trim()
+    return { title, viewBox, path }
+}
+
+async function loadProviderIcon(provider: string): Promise<IconMarkupState> {
+    const markup = await loadProviderIconMarkup(provider)
+    if (!markup) {
+        return { status: "missing" }
+    }
+
+    const parsed = parseIconMarkup(markup)
+    if (!parsed) {
+        return { status: "missing" }
+    }
+
+    return { status: "ready", icon: parsed }
 }
 
 export function OAuthProviderIcon({
@@ -42,35 +66,28 @@ export function OAuthProviderIcon({
     ...props
 }: SVGProps & { provider: string; title?: string }) {
     const providerSlug = toProviderSlug(provider)
-    const [iconMarkup, setIconMarkup] = useState<string | null>(() => {
+    const [iconState, setIconState] = useState<IconMarkupState | null>(() => {
         return iconMarkupCache.get(providerSlug) ?? null
     })
 
     useEffect(() => {
-        const cached = iconMarkupCache.get(providerSlug)
-        if (cached !== undefined) {
-            setIconMarkup(cached)
-            return
-        }
-
-        const loadPromise = loadProviderIconMarkup(provider)
-        if (!loadPromise) {
-            iconMarkupCache.set(providerSlug, null)
-            setIconMarkup(null)
+        if (iconMarkupCache.has(providerSlug)) {
+            setIconState(iconMarkupCache.get(providerSlug) ?? null)
             return
         }
 
         let cancelled = false
-        loadPromise
-            .then((markup) => {
+        loadProviderIcon(provider)
+            .then((result) => {
                 if (cancelled) return
-                iconMarkupCache.set(providerSlug, markup)
-                setIconMarkup(markup)
+                iconMarkupCache.set(providerSlug, result)
+                setIconState(result)
             })
             .catch(() => {
                 if (cancelled) return
-                iconMarkupCache.set(providerSlug, null)
-                setIconMarkup(null)
+                const missingState = { status: "missing" } as const
+                iconMarkupCache.set(providerSlug, missingState)
+                setIconState(missingState)
             })
 
         return () => {
@@ -78,20 +95,22 @@ export function OAuthProviderIcon({
         }
     }, [provider, providerSlug])
 
-    if (!iconMarkup) {
+    if (!iconState || iconState.status !== "ready") {
         return null
     }
 
+    const iconTitle = title ?? iconState.icon.title
+
     return (
         <svg
-            viewBox={getSvgViewBox(iconMarkup)}
+            viewBox={iconState.icon.viewBox}
             fill="currentColor"
-            aria-hidden={title ? undefined : "true"}
-            role={title ? "img" : undefined}
+            aria-hidden={iconTitle ? undefined : "true"}
+            role={iconTitle ? "img" : undefined}
             {...props}
         >
-            {title ? <title>{title}</title> : null}
-            <g dangerouslySetInnerHTML={{ __html: getSvgInnerMarkup(iconMarkup) }} />
+            {iconTitle ? <title>{iconTitle}</title> : null}
+            <path d={iconState.icon.path} />
         </svg>
     )
 }