Add Cloudflare Worker for internal URL rewriting

Introduces a Cloudflare Worker (cloudflare-worker.js) that transparently rewrites requests from dataplat.dbatools.io to dataplat.github.io, handling redirects and removing headers that could expose the upstream host. Adds wrangler.toml configuration for deployment and routing.

Author: potatoqualitee

cloudflare-worker.js

@@ -0,0 +1,91 @@
+/**
+ * Cloudflare Worker for Internal URL Rewriting
+ *
+ * This worker rewrites requests from dataplat.dbatools.io to dataplat.github.io
+ * internally without exposing the upstream host to users.
+ *
+ * Route: dataplat.dbatools.io/*
+ */
+
+addEventListener('fetch', event => {
+  event.respondWith(handleRequest(event.request))
+})
+
+async function handleRequest(request) {
+  // Parse the request URL
+  const url = new URL(request.url)
+
+  // Only process requests for dataplat.dbatools.io
+  if (url.hostname !== 'dataplat.dbatools.io') {
+    // Pass through all other traffic unchanged
+    return fetch(request)
+  }
+
+  // Create a new URL with the GitHub Pages hostname
+  const rewrittenUrl = new URL(request.url)
+  rewrittenUrl.hostname = 'dataplat.github.io'
+
+  // Create a new request with the rewritten URL
+  // Preserve the original method, headers, and body
+  const modifiedRequest = new Request(rewrittenUrl.toString(), {
+    method: request.method,
+    headers: request.headers,
+    body: request.body,
+    redirect: 'manual' // Important: Handle redirects manually to prevent GitHub Pages redirects
+  })
+
+  try {
+    // Fetch from the GitHub Pages URL
+    const response = await fetch(modifiedRequest)
+
+    // Handle GitHub Pages redirects internally
+    if (response.status >= 300 && response.status < 400) {
+      const location = response.headers.get('Location')
+      if (location) {
+        // If GitHub Pages tries to redirect, modify the Location header
+        const redirectUrl = new URL(location, rewrittenUrl.toString())
+        if (redirectUrl.hostname === 'dataplat.github.io') {
+          redirectUrl.hostname = 'dataplat.dbatools.io'
+        }
+
+        // Create a new response with the corrected Location header
+        const newResponse = new Response(response.body, {
+          status: response.status,
+          statusText: response.statusText,
+          headers: response.headers
+        })
+        newResponse.headers.set('Location', redirectUrl.toString())
+        return newResponse
+      }
+    }
+
+    // Create a new response to ensure we can modify headers if needed
+    const newResponse = new Response(response.body, {
+      status: response.status,
+      statusText: response.statusText,
+      headers: response.headers
+    })
+
+    // Remove any headers that might expose the upstream host
+    newResponse.headers.delete('server')
+    newResponse.headers.delete('x-github-request-id')
+
+    // Set CORS headers if needed (optional, depending on your requirements)
+    newResponse.headers.set('Access-Control-Allow-Origin', '*')
+
+    return newResponse
+
+  } catch (error) {
+    // Log error for debugging (visible in Cloudflare dashboard)
+    console.error('Worker error:', error)
+
+    // Return a generic error response
+    return new Response('Service temporarily unavailable', {
+      status: 503,
+      headers: {
+        'Content-Type': 'text/plain',
+        'Cache-Control': 'no-cache'
+      }
+    })
+  }
+}

wrangler.toml

@@ -0,0 +1,11 @@
+name = "dataplat-url-rewriter"
+main = "cloudflare-worker.js"
+compatibility_date = "2024-12-01"
+
+# Optional: Set the account ID if you have multiple Cloudflare accounts
+# account_id = "your-account-id-here"
+
+# Route configuration (can also be set in Cloudflare dashboard)
+[[routes]]
+pattern = "dataplat.dbatools.io/*"
+zone_name = "dbatools.io"