fix(www): prevent build failure when NEXT_PUBLIC_APP_URL is missing

apps/www/app/(docs)/docs/[[...slug]]/page.tsx

@@ -53,9 +53,7 @@ export async function generateMetadata({
     return {}
   }
 
-  const url = process.env.NEXT_PUBLIC_APP_URL
-
-  const ogUrl = new URL(`${url}/og`)
+  const ogUrl = new URL(absoluteUrl("/og"))
   ogUrl.searchParams.set("title", doc.title ?? "")
   ogUrl.searchParams.set("description", doc.description ?? "")
 

apps/www/app/(marketing)/showcase/[...slug]/page.tsx

@@ -40,9 +40,7 @@ export async function generateMetadata({
     return {}
   }
 
-  const url = process.env.NEXT_PUBLIC_APP_URL
-
-  const ogUrl = new URL(`${url}/og`)
+  const ogUrl = new URL(absoluteUrl("/og"))
   ogUrl.searchParams.set("title", doc.title ?? "")
   ogUrl.searchParams.set("description", doc.description ?? "")
 

apps/www/lib/utils.ts

@@ -1,8 +1,10 @@
 import process from "process"
-import { Metadata } from "next"
+import type { Metadata } from "next"
 import clsx, { ClassValue } from "clsx"
 import { twMerge } from "tailwind-merge"
 
+import { siteConfig } from "@/config/site"
+
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
@@ -65,8 +67,28 @@ export const normalizeTag = (tag: unknown): string[] => {
     : [String(tag)]
 }
 
+const getBaseUrl = (): string => {
+  const configuredUrl = process.env.NEXT_PUBLIC_APP_URL?.trim()
+  if (!configuredUrl) {
+    return siteConfig.url
+  }
+
+  let url = configuredUrl.replace(/\/$/, "")
+  if (!/^https?:\/\//i.test(url)) {
+    url = `https://${url}`
+  }
+
+  try {
+    new URL(url)
+    return url
+  } catch {
+    return siteConfig.url
+  }
+}
+
 export function absoluteUrl(path: string) {
-  return `${process.env.NEXT_PUBLIC_APP_URL}${path}`
+  const normalizedPath = path.startsWith("/") ? path : `/${path}`
+  return new URL(normalizedPath, `${getBaseUrl()}/`).toString()
 }
 
 export function constructMetadata({