ui flags replaced in index.html (#2617)

Signed-off-by: andreas-unleash <andreas@getunleash.ai>

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This PR puts the ui flags in the index.html in a meta tag. This makes
them accessible without logging in and allows us to track user signups
with invite links
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Signed-off-by: andreas-unleash <andreas@getunleash.ai>

frontend/index.html

@@ -6,6 +6,7 @@
         <meta http-equiv="X-UA-Compatible" content="IE=edge" />
         <meta name="baseUriPath" content="::baseUriPath::" />
         <meta name="cdnPrefix" content="::cdnPrefix::" />
+        <meta name="uiFlags" content="::uiFlags::" />
         <meta name="viewport" content="width=device-width, initial-scale=1" />
         <meta name="description" content="unleash" />
         <title>Unleash</title>

frontend/src/component/providers/PlausibleProvider/PlausibleProvider.tsx

@@ -11,8 +11,25 @@ export const PlausibleProvider: FC = ({ children }) => {
     const [context, setContext] = useState<ReturnType<typeof Plausible> | null>(
         null
     );
+
+    const getUIFlags = () => {
+        try {
+            const uiFlagsStr =
+                (
+                    document.querySelector(
+                        'meta[name="uiFlags"]'
+                    ) as HTMLMetaElement
+                )?.content || '{}';
+            return JSON.parse(uiFlagsStr);
+        } catch (e) {
+            return {};
+        }
+    };
+
+    const uiFlags = getUIFlags();
+
     const { uiConfig } = useUiConfig();
-    const isEnabled = Boolean(uiConfig?.flags?.T || LOCAL_TESTING);
+    const isEnabled = Boolean(uiConfig?.flags?.T || uiFlags.T || LOCAL_TESTING);
 
     useEffect(() => {
         if (isEnabled) {

src/lib/util/load-index-html.ts

@@ -9,6 +9,7 @@ export async function loadIndexHTML(
     publicFolder: string,
 ): Promise<string> {
     const { cdnPrefix, baseUriPath = '' } = config.server;
+    const uiFlags = JSON.stringify(config.ui.flags);
 
     let indexHTML: string;
     if (cdnPrefix) {
@@ -20,5 +21,5 @@ export async function loadIndexHTML(
             .toString();
     }
 
-    return rewriteHTML(indexHTML, baseUriPath, cdnPrefix);
+    return rewriteHTML(indexHTML, baseUriPath, cdnPrefix, uiFlags);
 }

src/lib/util/rewriteHTML.ts

@@ -2,6 +2,7 @@ export const rewriteHTML = (
     input: string,
     rewriteValue: string,
     cdnPrefix?: string,
+    uiFlags?: string,
 ): string => {
     let result = input;
     result = result.replace(/::baseUriPath::/gi, rewriteValue);
@@ -10,6 +11,8 @@ export const rewriteHTML = (
     const faviconPrefix = cdnPrefix ? 'https://cdn.getunleash.io' : '';
     result = result.replace(/::faviconPrefix::/gi, faviconPrefix);
 
+    result = result.replace(/::uiFlags::/gi, uiFlags);
+
     result = result.replace(
         /\/static/gi,
         `${cdnPrefix || rewriteValue}/static`,