added error handling for incorrect keys

app.py

@@ -5,11 +5,26 @@ from openai import OpenAI
 
 
 def tts(text, model, voice, api_key):
+    if api_key == '':
+        raise gr.Error('Please enter your OpenAI API Key')
+    else:
+        try:
+            client = openai.OpenAI(api_key=api_key)
+
+            response = client.audio.speech.create(
+                model='tts-1', # "tts-1","tts-1-hd"
+                voice='alloy', # 'alloy', 'echo', 'fable', 'onyx', 'nova', 'shimmer'
+                input='input text',
+            )
+
+        except Exception as error:
+            # Handle any exception that occurs
+            raise gr.Error("An error occurred while generating speech. Please check your API key and try again.")
+            print(str(error))
 
-    client = OpenAI(api_key=api_key)
     response = client.audio.speech.create(
-        model=model, #"tts-1","tts-1-hd"
-        voice=voice, #'alloy', 'echo', 'fable', 'onyx', 'nova', 'shimmer'
+        model=model, # expected values: "tts-1","tts-1-hd"
+        voice=voice, # expected values: 'alloy', 'echo', 'fable', 'onyx', 'nova', 'shimmer'
         input=text,
     )
 
@@ -35,7 +50,7 @@ with gr.Blocks() as demo:
     btn = gr.Button("Text-To-Speech")
     output_audio = gr.Audio(label="Speech Output")
     
-    text.submit(fn=tts, inputs=[text, model, voice, api_key], outputs=output_audio, api_name="tts", concurrency_limit=None)
-    btn.click(fn=tts, inputs=[text, model, voice, api_key], outputs=output_audio, api_name="tts", concurrency_limit=None)
+    text.submit(fn=tts, inputs=[text, model, voice, api_key], outputs=output_audio, api_name="tts_enter_key", concurrency_limit=None)
+    btn.click(fn=tts, inputs=[text, model, voice, api_key], outputs=output_audio, api_name="tts_button", concurrency_limit=None)
 
-demo.launch()
+demo.launch()