fix: enhance authorization handling with improved logging for missing and invalid headers

CollabTableAndroid/app/src/main/java/com/collabtable/app/data/api/ApiClient.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import com.collabtable.app.data.preferences.PreferencesManager
 import android.os.Build
 import android.net.Uri
+import com.collabtable.app.utils.Logger
 import okhttp3.Interceptor
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
@@ -32,7 +33,7 @@ object ApiClient {
             val newRequest =
                 if (!password.isNullOrBlank()) {
                     request.newBuilder()
-                        .header("Authorization", "Bearer $password")
+                        .header("Authorization", "Bearer ${'$'}password")
                         .build()
                 } else {
                     request
@@ -101,11 +102,17 @@ object ApiClient {
         this.context = context.applicationContext
         val prefs = PreferencesManager.getInstance(context)
         baseUrl = normalizeForAndroidEmulator(prefs.getServerUrl())
+        try {
+            Logger.i("HTTP", "API base URL initialized to $baseUrl")
+        } catch (_: Exception) { }
         retrofit = buildRetrofit()
     }
 
     fun setBaseUrl(url: String) {
         baseUrl = normalizeForAndroidEmulator(url)
+        try {
+            Logger.i("HTTP", "API base URL set to $baseUrl")
+        } catch (_: Exception) { }
         retrofit = buildRetrofit()
     }
 

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/ServerSetupViewModel.kt

@@ -41,7 +41,7 @@ class ServerSetupViewModel(
 
     fun validateAndSaveServerUrl(
         url: String,
-        password: String,
+    password: String,
     ) {
         viewModelScope.launch {
             _isValidating.value = true
@@ -85,8 +85,9 @@ class ServerSetupViewModel(
                 // Ensure it ends with /
                 normalizedUrl = if (normalizedUrl.endsWith("/")) normalizedUrl else "$normalizedUrl/"
 
-                // Validate password is not empty
-                if (password.isBlank()) {
+                // Validate password is not empty (trim leading/trailing spaces)
+                val trimmedPassword = password.trim()
+                if (trimmedPassword.isBlank()) {
                     _validationError.value = "Password cannot be empty"
                     _isValidating.value = false
                     return@launch
@@ -178,7 +179,7 @@ class ServerSetupViewModel(
                     val authRequest =
                         Request.Builder()
                             .url(testUrl)
-                            .header("Authorization", "Bearer $password")
+                            .header("Authorization", "Bearer ${'$'}trimmedPassword")
                             .get()
                             .build()
 
@@ -191,7 +192,7 @@ class ServerSetupViewModel(
                     if (authResponse.isSuccessful) {
                         // Password is valid, save both URL and password
                         preferencesManager.setServerUrl(finalUrl)
-                        preferencesManager.setServerPassword(password)
+                        preferencesManager.setServerPassword(trimmedPassword)
                         // Reset sync baseline for a fresh initial sync on new server
                         preferencesManager.clearSyncState()
                         preferencesManager.setIsFirstRun(false)

CollabTableServer/src/middleware/auth.ts

@@ -18,6 +18,12 @@ export const authenticatePassword = (req: Request, res: Response, next: NextFunc
   const authHeader = req.headers.authorization;
   
   if (!authHeader) {
+    // Log diagnostic info to help trace intermittent 401s
+    console.warn('[AUTH] Missing Authorization header', {
+      path: req.path,
+      method: req.method,
+      ip: req.ip,
+    });
     return res.status(401).json({ 
       error: 'Unauthorized', 
       message: 'No authorization header provided' 
@@ -27,6 +33,13 @@ export const authenticatePassword = (req: Request, res: Response, next: NextFunc
   // Parse the authorization header
   const parts = authHeader.split(' ');
   if (parts.length !== 2 || parts[0] !== 'Bearer') {
+    console.warn('[AUTH] Invalid authorization header format', {
+      path: req.path,
+      method: req.method,
+      ip: req.ip,
+      // Do not log full header to avoid leaking secrets; include prefix only
+      headerPreview: authHeader.substring(0, Math.min(authHeader.length, 20)) + '...'
+    });
     return res.status(401).json({ 
       error: 'Unauthorized', 
       message: 'Invalid authorization header format. Expected: Bearer <password>' 
@@ -37,6 +50,14 @@ export const authenticatePassword = (req: Request, res: Response, next: NextFunc
 
   // Validate password
   if (providedPassword !== serverPassword) {
+    // Avoid logging the full password; log only length and a small preview
+    const safePreview = providedPassword ? `${providedPassword.substring(0, 2)}…(${providedPassword.length})` : 'null';
+    console.warn('[AUTH] Invalid password', {
+      path: req.path,
+      method: req.method,
+      ip: req.ip,
+      providedPreview: safePreview,
+    });
     return res.status(401).json({ 
       error: 'Unauthorized', 
       message: 'Invalid password'