Add possibility to disable stacktraces on HTTP 500 error responses

app/src/main/java/io/bartek/ttsserver/core/web/server/WebServer.kt

@@ -41,9 +41,15 @@ class WebServer(
 
          throw WebException(BAD_REQUEST, "Unknown error")
       } catch (e: WebException) {
-         return newFixedLengthResponse(e.status, MIME_JSON, e.json)
+         return handleWebException(e)
       } catch (e: Exception) {
-         return newFixedLengthResponse(INTERNAL_ERROR, MIME_PLAINTEXT, e.toString())
+         return handleUnknownException(e)
+      }
+   }
+
+   private fun assertThatTTSIsReady() {
+      if (tts.status != TTSStatus.READY) {
+         throw WebException(NOT_ACCEPTABLE, "Server is not ready yet")
       }
    }
 
@@ -57,10 +63,16 @@ class WebServer(
       }
    }
 
-   private fun assertThatTTSIsReady() {
-      if (tts.status != TTSStatus.READY) {
-         throw WebException(NOT_ACCEPTABLE, "Server is not ready yet")
+   private fun handleWebException(e: WebException) =
+      newFixedLengthResponse(e.status, MIME_JSON, e.json)
+
+   private fun handleUnknownException(e: Exception): Response {
+      val stacktrace = when (preferences.getBoolean(PreferenceKey.ENABLE_HTTP_DEBUG, false)) {
+         true -> e.toString()
+         false -> ""
       }
+
+      return newFixedLengthResponse(INTERNAL_ERROR, MIME_PLAINTEXT, stacktrace)
    }
 
    private fun say(session: IHTTPSession): Response {

app/src/main/java/io/bartek/ttsserver/ui/preference/Preference.kt

@@ -3,6 +3,7 @@ package io.bartek.ttsserver.ui.preference
 
 object PreferenceKey {
    const val PORT = "preference_port"
+   const val ENABLE_HTTP_DEBUG = "preference_http_debug"
    const val ENABLE_SAY_ENDPOINT = "preference_enable_say_endpoint"
    const val ENABLE_WAVE_ENDPOINT = "preference_enable_wave_endpoint"
    const val ENABLE_SONOS_ENDPOINT = "preference_enable_sonos_endpoint"

app/src/main/java/io/bartek/ttsserver/ui/preference/PreferencesFragment.kt

@@ -20,6 +20,7 @@ class PreferencesFragment : PreferenceFragmentCompat() {
    private lateinit var sayEndpointPreference: SwitchPreference
    private lateinit var waveEndpointPreference: SwitchPreference
    private lateinit var sonosEndpointPreference: SwitchPreference
+   private lateinit var httpDebugPreference: SwitchPreference
    private lateinit var ttsEnginePreference: Preference
    private lateinit var clearSonosCachePreference: Preference
 
@@ -55,6 +56,7 @@ class PreferencesFragment : PreferenceFragmentCompat() {
       setPreferencesFromResource(R.xml.preferences, rootKey)
       portPreference = findPreference(PreferenceKey.PORT)!!
       portPreference.setOnBindEditTextListener { it.inputType = InputType.TYPE_CLASS_NUMBER }
+      httpDebugPreference = findPreference(PreferenceKey.ENABLE_HTTP_DEBUG)!!
       sayEndpointPreference = findPreference(PreferenceKey.ENABLE_SAY_ENDPOINT)!!
       waveEndpointPreference = findPreference(PreferenceKey.ENABLE_WAVE_ENDPOINT)!!
       sonosEndpointPreference = findPreference(PreferenceKey.ENABLE_SONOS_ENDPOINT)!!

app/src/main/res/values/strings.xml

@@ -23,12 +23,15 @@
     <string name="preference_enable_wave_endpoint_title">Enable /wave endpoint</string>
     <string name="preference_enable_sonos_endpoint_summary">Allow HTTP clients to use /sonos endpoint which enables them to send TTS messages directly to Sonos devices</string>
     <string name="preference_enable_sonos_endpoint_title">Enable /sonos endpoint</string>
+    <string name="preference_http_debug_summary">Attach the stacktrace to each error HTTP response if available</string>
+    <string name="preference_http_debug_title">Enable HTTP debugging</string>
     <string name="preference_tts_summary">Go to platform\'s TTS engine settings and adjust its parameters</string>
     <string name="preference_tts_title">TTS engine settings</string>
     <string name="preference_invalidate_sonos_cache_summary">Clear application cache directory from already generated Sonos TTS data for given sentences. You typically want to do it when you change the TTS engine\'s voice settings.</string>
     <string name="preference_invalidate_sonos_cache_title">Invalidate Sonos cache</string>
-    <string name="preference_category_tts">TTS engine</string>
     <string name="preference_category_server">Server</string>
+    <string name="preference_category_features">Features</string>
+    <string name="preference_category_tts">TTS engine</string>
     <string name="preference_category_sonos">Sonos</string>
     <string name="preference_invalidate_sonos_cache_toast">Sonos cache has been invalidated</string>
 

app/src/main/res/xml/preferences.xml

@@ -9,7 +9,15 @@
             android:summary="@string/preference_port_summary"
             android:title="@string/preference_port_title"
             app:iconSpaceReserved="false" />
+        <SwitchPreference
+            android:defaultValue="false"
+            android:key="preference_http_debug"
+            android:summary="@string/preference_http_debug_summary"
+            android:title="@string/preference_http_debug_title"
+            app:iconSpaceReserved="false" />
+    </PreferenceCategory>
 
+    <PreferenceCategory android:title="@string/preference_category_features" app:iconSpaceReserved="false">
         <SwitchPreference
             android:defaultValue="true"
             android:key="preference_enable_say_endpoint"
@@ -30,7 +38,6 @@
             android:summary="@string/preference_enable_sonos_endpoint_summary"
             android:title="@string/preference_enable_sonos_endpoint_title"
             app:iconSpaceReserved="false" />
-
     </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/preference_category_tts" app:iconSpaceReserved="false">