main.py

#main.py

import base64
import streamlit as st
import streamlit.components.v1 as components

from threat_model import create_threat_model_prompt, get_threat_model, get_threat_model_azure, get_threat_model_google, get_threat_model_mistral, json_to_markdown, get_image_analysis, create_image_analysis_prompt
from attack_tree import create_attack_tree_prompt, get_attack_tree, get_attack_tree_azure, get_attack_tree_mistral
from mitigations import create_mitigations_prompt, get_mitigations, get_mitigations_azure, get_mitigations_google, get_mitigations_mistral
from test_cases import create_test_cases_prompt, get_test_cases, get_test_cases_azure, get_test_cases_google, get_test_cases_mistral
from dread import create_dread_assessment_prompt, get_dread_assessment, get_dread_assessment_azure, get_dread_assessment_google, get_dread_assessment_mistral, dread_json_to_markdown

# ------------------ Helper Functions ------------------ #

# Function to get user input for the application description and key details
def get_input():
       input_text = st.text_area(
           label="Describe the application to be modelled",
           placeholder="Enter your application details...",
           height=150,
           key="app_desc",
           help="Please provide a detailed description of the application, including the purpose of the application, the technologies used, and any other relevant information.",
       )

       st.session_state['app_input'] = input_text

       return input_text

# Function to render Mermaid diagram
def mermaid(code: str, height: int = 500) -> None:
    components.html(
        f"""
        <pre class="mermaid" style="height: {height}px;">
            {code}
        </pre>

        <script type="module">
            import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
            mermaid.initialize({{ startOnLoad: true }});
        </script>
        """,
        height=height,
    )


# ------------------ Streamlit UI Configuration ------------------ #

st.set_page_config(
    page_title="STRIDE GPT",
    page_icon=":shield:",
    layout="wide",
    initial_sidebar_state="expanded",
)

# ------------------ Sidebar ------------------ #

st.sidebar.image("logo.png")

# Add instructions on how to use the app to the sidebar
st.sidebar.header("How to use STRIDE GPT")

with st.sidebar:
    # Add model selection input field to the sidebar
    model_provider = st.selectbox(
        "Select your preferred model provider:",
        ["OpenAI API", "Azure OpenAI Service", "Google AI API", "Mistral API"],
        key="model_provider",
        help="Select the model provider you would like to use. This will determine the models available for selection.",
    )

    if model_provider == "OpenAI API":
        st.markdown(
        """
    1. Enter your [OpenAI API key](https://platform.openai.com/account/api-keys) and chosen model below 🔑
    2. Provide details of the application that you would like to threat model  📝
    3. Generate a threat list, attack tree and/or mitigating controls for your application 🚀
    """
    )
        # Add OpenAI API key input field to the sidebar
        openai_api_key = st.text_input(
            "Enter your OpenAI API key:",
            type="password",
            help="You can find your OpenAI API key on the [OpenAI dashboard](https://platform.openai.com/account/api-keys).",
        )

        # Add model selection input field to the sidebar
        selected_model = st.selectbox(
            "Select the model you would like to use:",
            ["gpt-4o", "gpt-4-turbo", "gpt-4", "gpt-3.5-turbo"],
            key="selected_model",
            help="OpenAI have moved to continuous model upgrades so `gpt-3.5-turbo`, `gpt-4` and `gpt-4-turbo` point to the latest available version of each model.",
        )

    if model_provider == "Azure OpenAI Service":
        st.markdown(
        """
    1. Enter your Azure OpenAI API key, endpoint and deployment name below 🔑
    2. Provide details of the application that you would like to threat model  📝
    3. Generate a threat list, attack tree and/or mitigating controls for your application 🚀
    """
    )

        # Add Azure OpenAI API key input field to the sidebar
        azure_api_key = st.text_input(
            "Azure OpenAI API key:",
            type="password",
            help="You can find your Azure OpenAI API key on the [Azure portal](https://portal.azure.com/).",
        )
        
        # Add Azure OpenAI endpoint input field to the sidebar
        azure_api_endpoint = st.text_input(
            "Azure OpenAI endpoint:",
            help="Example endpoint: https://YOUR_RESOURCE_NAME.openai.azure.com/",
        )

        # Add Azure OpenAI deployment name input field to the sidebar
        azure_deployment_name = st.text_input(
            "Deployment name:",
        )
        
        st.info("Please note that you must use an 1106-preview model deployment.")

        azure_api_version = '2023-12-01-preview' # Update this as needed

        st.write(f"Azure API Version: {azure_api_version}")

    if model_provider == "Google AI API":
        st.markdown(
        """
    1. Enter your [Google AI API key](https://makersuite.google.com/app/apikey) and chosen model below 🔑
    2. Provide details of the application that you would like to threat model  📝
    3. Generate a threat list, attack tree and/or mitigating controls for your application 🚀
    """
    )
        # Add OpenAI API key input field to the sidebar
        google_api_key = st.text_input(
            "Enter your Google AI API key:",
            type="password",
            help="You can generate a Google AI API key in the [Google AI Studio](https://makersuite.google.com/app/apikey).",
        )

        # Add model selection input field to the sidebar
        google_model = st.selectbox(
            "Select the model you would like to use:",
            ["gemini-1.5-pro-latest"],
            key="selected_model",
        )

    if model_provider == "Mistral API":
        st.markdown(
        """
    1. Enter your [Mistral API key](https://console.mistral.ai/api-keys/) and chosen model below 🔑
    2. Provide details of the application that you would like to threat model  📝
    3. Generate a threat list, attack tree and/or mitigating controls for your application 🚀
    """
    )
        # Add OpenAI API key input field to the sidebar
        mistral_api_key = st.text_input(
            "Enter your Mistral API key:",
            type="password",
            help="You can generate a Mistral API key in the [Mistral console](https://console.mistral.ai/api-keys/).",
        )

        # Add model selection input field to the sidebar
        mistral_model = st.selectbox(
            "Select the model you would like to use:",
            ["mistral-large-latest", "mistral-small-latest"],
            key="selected_model",
        )

    st.markdown("""---""")

# Add "About" section to the sidebar
st.sidebar.header("About")

with st.sidebar:
    st.markdown(
        "Welcome to STRIDE GPT, an AI-powered tool designed to help teams produce better threat models for their applications."
    )
    st.markdown(
        "Threat modelling is a key activity in the software development lifecycle, but is often overlooked or poorly executed. STRIDE GPT aims to help teams produce more comprehensive threat models by leveraging the power of Large Language Models (LLMs) to generate a threat list, attack tree and/or mitigating controls for an application based on the details provided."
    )
    st.markdown("Created by [Matt Adams](https://www.linkedin.com/in/matthewrwadams/).")
    # Add "Star on GitHub" link to the sidebar
    st.sidebar.markdown(
        "⭐ Star on GitHub: [![Star on GitHub](https://img.shields.io/github/stars/mrwadams/stride-gpt?style=social)](https://github.com/mrwadams/stride-gpt)"
    )
    st.markdown("""---""")


# Add "Example Application Description" section to the sidebar
st.sidebar.header("Example Application Description")

with st.sidebar:
    st.markdown(
        "Below is an example application description that you can use to test STRIDE GPT:"
    )
    st.markdown(
        "> A web application that allows users to create, store, and share personal notes. The application is built using the React frontend framework and a Node.js backend with a MongoDB database. Users can sign up for an account and log in using OAuth2 with Google or Facebook. The notes are encrypted at rest and are only accessible by the user who created them. The application also supports real-time collaboration on notes with other users."
    )
    st.markdown("""---""")

# Add "FAQs" section to the sidebar
st.sidebar.header("FAQs")

with st.sidebar:
    st.markdown(
        """
    ### **What is STRIDE?**
    STRIDE is a threat modeling methodology that helps to identify and categorise potential security risks in software applications. It stands for **S**poofing, **T**ampering, **R**epudiation, **I**nformation Disclosure, **D**enial of Service, and **E**levation of Privilege.
    """
    )
    st.markdown(
        """
    ### **How does STRIDE GPT work?**
    When you enter an application description and other relevant details, the tool will use a GPT model to generate a threat model for your application. The model uses the application description and details to generate a list of potential threats and then categorises each threat according to the STRIDE methodology.
    """
    )
    st.markdown(
        """
    ### **Do you store the application details provided?**
    No, STRIDE GPT does not store your application description or other details. All entered data is deleted after you close the browser tab.
    """
    )
    st.markdown(
        """
    ### **Why does it take so long to generate a threat model?**
    If you are using a free OpenAI API key, it will take a while to generate a threat model. This is because the free API key has strict rate limits. To speed up the process, you can use a paid API key.
    """
    )
    st.markdown(
        """
    ### **Are the threat models 100% accurate?**
    No, the threat models are not 100% accurate. STRIDE GPT uses GPT Large Language Models (LLMs) to generate its output. The GPT models are powerful, but they sometimes makes mistakes and are prone to 'hallucinations' (generating irrelevant or inaccurate content). Please use the output only as a starting point for identifying and addressing potential security risks in your applications.
    """
    )
    st.markdown(
        """
    ### **How can I improve the accuracy of the threat models?**
    You can improve the accuracy of the threat models by providing a detailed description of the application and selecting the correct application type, authentication methods, and other relevant details. The more information you provide, the more accurate the threat models will be.
    """
    )


# ------------------ Main App UI ------------------ #

tab1, tab2, tab3, tab4, tab5 = st.tabs(["Threat Model", "Attack Tree", "Mitigations", "DREAD", "Test Cases"])

with tab1:
    st.markdown("""
A threat model helps identify and evaluate potential security threats to applications / systems. It provides a systematic approach to 
understanding possible vulnerabilities and attack vectors. Use this tab to generate a threat model using the STRIDE methodology.
""")
    st.markdown("""---""")
    
    # Two column layout for the main app content
    col1, col2 = st.columns([1, 1])

    # If model provider is OpenAI API and the model is gpt-4-turbo
    with col1:
        if model_provider == "OpenAI API" and selected_model in ["gpt-4-turbo", "gpt-4o"]:
            uploaded_file = st.file_uploader("Upload architecture diagram", type=["jpg", "jpeg", "png"])

            if uploaded_file is not None:
                if not openai_api_key:
                    st.error("Please enter your OpenAI API key to analyse the image.")
                else:
                    if 'uploaded_file' not in st.session_state or st.session_state.uploaded_file != uploaded_file:
                        st.session_state.uploaded_file = uploaded_file
                        with st.spinner("Analysing the uploaded image..."):
                            def encode_image(uploaded_file):
                                return base64.b64encode(uploaded_file.read()).decode('utf-8')

                            base64_image = encode_image(uploaded_file)

                            image_analysis_prompt = create_image_analysis_prompt()

                            try:
                                image_analysis_output = get_image_analysis(openai_api_key, selected_model, image_analysis_prompt, base64_image)
                                if image_analysis_output and 'choices' in image_analysis_output and image_analysis_output['choices'][0]['message']['content']:
                                    image_analysis_content = image_analysis_output['choices'][0]['message']['content']
                                    st.session_state.image_analysis_content = image_analysis_content
                                else:
                                    st.error("Failed to analyze the image. Please check the API key and try again.")
                            except KeyError as e:
                                st.error("Failed to analyze the image. Please check the API key and try again.")
                                print(f"Error: {e}")
                            except Exception as e:
                                st.error("An unexpected error occurred while analyzing the image.")
                                print(f"Error: {e}")

                        app_input = st.text_area(
                            label="Describe the application to be modelled",
                            value=st.session_state.get('image_analysis_content', ''),
                            key="app_input",
                            help="Please provide a detailed description of the application, including the purpose of the application, the technologies used, and any other relevant information.",
                        )
            else:
                if 'image_analysis_content' in st.session_state:
                    del st.session_state.image_analysis_content
                app_input = get_input()
        else:
            app_input = get_input()
            if 'app_input' not in st.session_state:
                st.session_state['app_input'] = app_input


        # Create input fields for additional details
        with col2:
            app_type = st.selectbox(
                label="Select the application type",
                options=[
                    "Web application",
                    "Mobile application",
                    "Desktop application",
                    "Cloud application",
                    "IoT application",
                    "Other",
                ],
                key="app_type",
            )

            sensitive_data = st.selectbox(
                label="What is the highest sensitivity level of the data processed by the application?",
                options=[
                    "Top Secret",
                    "Secret",
                    "Confidential",
                    "Restricted",
                    "Unclassified",
                    "None",
                ],
                key="sensitive_data",
            )

        # Create input fields for internet_facing and authentication
            internet_facing = st.selectbox(
                label="Is the application internet-facing?",
                options=["Yes", "No"],
                key="internet_facing",
            )

            authentication = st.multiselect(
                "What authentication methods are supported by the application?",
                ["SSO", "MFA", "OAUTH2", "Basic", "None"],
                key="authentication",
            )



    # ------------------ Threat Model Generation ------------------ #

    # Create a submit button for Threat Modelling
    threat_model_submit_button = st.button(label="Generate Threat Model")

    # If the Generate Threat Model button is clicked and the user has provided an application description
    if threat_model_submit_button and st.session_state.get('app_input'):
        app_input = st.session_state['app_input']  # Retrieve from session state
        # Generate the prompt using the create_prompt function
        threat_model_prompt = create_threat_model_prompt(app_type, authentication, internet_facing, sensitive_data, app_input)

        # Show a spinner while generating the threat model
        with st.spinner("Analysing potential threats..."):
            max_retries = 3
            retry_count = 0
            while retry_count < max_retries:
                try:
                    # Call the relevant get_threat_model function with the generated prompt
                    if model_provider == "Azure OpenAI Service":
                        model_output = get_threat_model_azure(azure_api_endpoint, azure_api_key, azure_api_version, azure_deployment_name, threat_model_prompt)
                    elif model_provider == "OpenAI API":
                        model_output = get_threat_model(openai_api_key, selected_model, threat_model_prompt)
                    elif model_provider == "Google AI API":
                        model_output = get_threat_model_google(google_api_key, google_model, threat_model_prompt)
                    elif model_provider == "Mistral API":
                        model_output = get_threat_model_mistral(mistral_api_key, mistral_model, threat_model_prompt)

                    # Access the threat model and improvement suggestions from the parsed content
                    threat_model = model_output.get("threat_model", [])
                    improvement_suggestions = model_output.get("improvement_suggestions", [])

                    # Save the threat model to the session state for later use in mitigations
                    st.session_state['threat_model'] = threat_model
                    break  # Exit the loop if successful
                except Exception as e:
                    retry_count += 1
                    if retry_count == max_retries:
                        st.error(f"Error generating threat model after {max_retries} attempts: {e}")
                        threat_model = []
                        improvement_suggestions = []
                    else:
                        st.warning(f"Error generating threat model. Retrying attempt {retry_count+1}/{max_retries}...")

        # Convert the threat model JSON to Markdown
        markdown_output = json_to_markdown(threat_model, improvement_suggestions)

        # Display the threat model in Markdown
        st.markdown(markdown_output)

        # Add a button to allow the user to download the output as a Markdown file
        st.download_button(
            label="Download Threat Model",
            data=markdown_output,  # Use the Markdown output
            file_name="stride_gpt_threat_model.md",
            mime="text/markdown",
       )

# If the submit button is clicked and the user has not provided an application description
if threat_model_submit_button and not st.session_state.get('app_input'):
    st.error("Please enter your application details before submitting.")



# ------------------ Attack Tree Generation ------------------ #

with tab2:
    st.markdown("""
Attack trees are a structured way to analyse the security of a system. They represent potential attack scenarios in a hierarchical format, 
with the ultimate goal of an attacker at the root and various paths to achieve that goal as branches. This helps in understanding system 
vulnerabilities and prioritising mitigation efforts.
""")
    st.markdown("""---""")
    if model_provider == "Google AI API":
        st.warning("⚠️ Google's safety filters prevent the reliable generation of attack trees. Please use a different model provider.")
    else:
        if model_provider == "Mistral API" and mistral_model == "mistral-small-latest":
            st.warning("⚠️ Mistral Small doesn't reliably generate syntactically correct Mermaid code. Please use the Mistral Large model for generating attack trees, or select a different model provider.")
        
        # Create a submit button for Attack Tree
        attack_tree_submit_button = st.button(label="Generate Attack Tree")
        
        # If the Generate Attack Tree button is clicked and the user has provided an application description
        if attack_tree_submit_button and st.session_state.get('app_input'):
            app_input = st.session_state.get('app_input')
            # Generate the prompt using the create_attack_tree_prompt function
            attack_tree_prompt = create_attack_tree_prompt(app_type, authentication, internet_facing, sensitive_data, app_input)

            # Show a spinner while generating the attack tree
            with st.spinner("Generating attack tree..."):
                try:
                    # Call the relevant get_attack_tree function with the generated prompt
                    if model_provider == "Azure OpenAI Service":
                        mermaid_code = get_attack_tree_azure(azure_api_endpoint, azure_api_key, azure_api_version, azure_deployment_name, attack_tree_prompt)
                    elif model_provider == "OpenAI API":
                        mermaid_code = get_attack_tree(openai_api_key, selected_model, attack_tree_prompt)
                    elif model_provider == "Mistral API":
                        mermaid_code = get_attack_tree_mistral(mistral_api_key, mistral_model, attack_tree_prompt)

                    # Display the generated attack tree code
                    st.write("Attack Tree Code:")
                    st.code(mermaid_code)

                    # Visualise the attack tree using the Mermaid custom component
                    st.write("Attack Tree Diagram Preview:")
                    mermaid(mermaid_code)
                    
                    col1, col2, col3, col4, col5 = st.columns([1,1,1,1,1])
                    
                    with col1:              
                        # Add a button to allow the user to download the Mermaid code
                        st.download_button(
                            label="Download Diagram Code",
                            data=mermaid_code,
                            file_name="attack_tree.md",
                            mime="text/plain",
                            help="Download the Mermaid code for the attack tree diagram."
                        )

                    with col2:
                        # Add a button to allow the user to open the Mermaid Live editor
                        mermaid_live_button = st.link_button("Open Mermaid Live", "https://mermaid.live")
                    
                    with col3:
                        # Blank placeholder
                        st.write("")
                    
                    with col4:
                        # Blank placeholder
                        st.write("")
                    
                    with col5:
                        # Blank placeholder
                        st.write("")

                except Exception as e:
                    st.error(f"Error generating attack tree: {e}")


# ------------------ Mitigations Generation ------------------ #

with tab3:
    st.markdown("""
Use this tab to generate potential mitigations for the threats identified in the threat model. Mitigations are security controls or
countermeasures that can help reduce the likelihood or impact of a security threat. The generated mitigations can be used to enhance
the security posture of the application and protect against potential attacks.
""")
    st.markdown("""---""")
    
    # Create a submit button for Mitigations
    mitigations_submit_button = st.button(label="Suggest Mitigations")

    # If the Suggest Mitigations button is clicked and the user has identified threats
    if mitigations_submit_button:
        # Check if threat_model data exists
        if 'threat_model' in st.session_state and st.session_state['threat_model']:
            # Convert the threat_model data into a Markdown list
            threats_markdown = json_to_markdown(st.session_state['threat_model'], [])
            # Generate the prompt using the create_mitigations_prompt function
            mitigations_prompt = create_mitigations_prompt(threats_markdown)

            # Show a spinner while suggesting mitigations
            with st.spinner("Suggesting mitigations..."):
                max_retries = 3
                retry_count = 0
                while retry_count < max_retries:
                    try:
                        # Call the relevant get_mitigations function with the generated prompt
                        if model_provider == "Azure OpenAI Service":
                            mitigations_markdown = get_mitigations_azure(azure_api_endpoint, azure_api_key, azure_api_version, azure_deployment_name, mitigations_prompt)
                        elif model_provider == "OpenAI API":
                            mitigations_markdown = get_mitigations(openai_api_key, selected_model, mitigations_prompt)
                        elif model_provider == "Google AI API":
                            mitigations_markdown = get_mitigations_google(google_api_key, google_model, mitigations_prompt)
                        elif model_provider == "Mistral API":
                            mitigations_markdown = get_mitigations_mistral(mistral_api_key, mistral_model, mitigations_prompt)

                        # Display the suggested mitigations in Markdown
                        st.markdown(mitigations_markdown)
                        break  # Exit the loop if successful
                    except Exception as e:
                        retry_count += 1
                        if retry_count == max_retries:
                            st.error(f"Error suggesting mitigations after {max_retries} attempts: {e}")
                            mitigations_markdown = ""
                        else:
                            st.warning(f"Error suggesting mitigations. Retrying attempt {retry_count+1}/{max_retries}...")
            
            st.markdown("")

            # Add a button to allow the user to download the mitigations as a Markdown file
            st.download_button(
                label="Download Mitigations",
                data=mitigations_markdown,
                file_name="mitigations.md",
                mime="text/markdown",
            )
        else:
            st.error("Please generate a threat model first before suggesting mitigations.")

# ------------------ DREAD Risk Assessment Generation ------------------ #
with tab4:
    st.markdown("""
DREAD is a method for evaluating and prioritising risks associated with security threats. It assesses threats based on **D**amage potential, 
**R**eproducibility, **E**xploitability, **A**ffected users, and **D**iscoverability. This helps in determining the overall risk level and 
focusing on the most critical threats first. Use this tab to perform a DREAD risk assessment for your application / system.
""")
    st.markdown("""---""")
    
    # Create a submit button for DREAD Risk Assessment
    dread_assessment_submit_button = st.button(label="Generate DREAD Risk Assessment")
    # If the Generate DREAD Risk Assessment button is clicked and the user has identified threats
    if dread_assessment_submit_button:
        # Check if threat_model data exists
        if 'threat_model' in st.session_state and st.session_state['threat_model']:
            # Convert the threat_model data into a Markdown list
            threats_markdown = json_to_markdown(st.session_state['threat_model'], [])
            # Generate the prompt using the create_dread_assessment_prompt function
            dread_assessment_prompt = create_dread_assessment_prompt(threats_markdown)
            # Show a spinner while generating DREAD Risk Assessment
            with st.spinner("Generating DREAD Risk Assessment..."):
                max_retries = 3
                retry_count = 0
                while retry_count < max_retries:
                    try:
                        # Call the relevant get_dread_assessment function with the generated prompt
                        if model_provider == "Azure OpenAI Service":
                            dread_assessment = get_dread_assessment_azure(azure_api_endpoint, azure_api_key, azure_api_version, azure_deployment_name, dread_assessment_prompt)
                        elif model_provider == "OpenAI API":
                            dread_assessment = get_dread_assessment(openai_api_key, selected_model, dread_assessment_prompt)
                        elif model_provider == "Google AI API":
                            dread_assessment = get_dread_assessment_google(google_api_key, google_model, dread_assessment_prompt)
                        elif model_provider == "Mistral API":
                            dread_assessment = get_dread_assessment_mistral(mistral_api_key, mistral_model, dread_assessment_prompt)
                        # Save the DREAD assessment to the session state for later use in test cases
                        st.session_state['dread_assessment'] = dread_assessment
                        break  # Exit the loop if successful
                    except Exception as e:
                        retry_count += 1
                        if retry_count == max_retries:
                            st.error(f"Error generating DREAD risk assessment after {max_retries} attempts: {e}")
                            dread_assessment = []
                        else:
                            st.warning(f"Error generating DREAD risk assessment. Retrying attempt {retry_count+1}/{max_retries}...")
            # Convert the DREAD assessment JSON to Markdown
            dread_assessment_markdown = dread_json_to_markdown(dread_assessment)
            # Display the DREAD assessment in Markdown
            st.markdown(dread_assessment_markdown)
            # Add a button to allow the user to download the test cases as a Markdown file
            st.download_button(
                label="Download DREAD Risk Assessment",
                data=dread_assessment_markdown,
                file_name="dread_assessment.md",
                mime="text/markdown",
            )
        else:
            st.error("Please generate a threat model first before requesting a DREAD risk assessment.")


# ------------------ Test Cases Generation ------------------ #

with tab5:
    st.markdown("""
Test cases are used to validate the security of an application and ensure that potential vulnerabilities are identified and 
addressed. This tab allows you to generate test cases using Gherkin syntax. Gherkin provides a structured way to describe application 
behaviours in plain text, using a simple syntax of Given-When-Then statements. This helps in creating clear and executable test 
scenarios.
""")
    st.markdown("""---""")
                
    # Create a submit button for Test Cases
    test_cases_submit_button = st.button(label="Generate Test Cases")

    # If the Generate Test Cases button is clicked and the user has identified threats
    if test_cases_submit_button:
        # Check if threat_model data exists
        if 'threat_model' in st.session_state and st.session_state['threat_model']:
            # Convert the threat_model data into a Markdown list
            threats_markdown = json_to_markdown(st.session_state['threat_model'], [])
            # Generate the prompt using the create_test_cases_prompt function
            test_cases_prompt = create_test_cases_prompt(threats_markdown)

            # Show a spinner while generating test cases
            with st.spinner("Generating test cases..."):
                max_retries = 3
                retry_count = 0
                while retry_count < max_retries:
                    try:
                        # Call to the relevant get_test_cases function with the generated prompt
                        if model_provider == "Azure OpenAI Service":
                            test_cases_markdown = get_test_cases_azure(azure_api_endpoint, azure_api_key, azure_api_version, azure_deployment_name, test_cases_prompt)
                        elif model_provider == "OpenAI API":
                            test_cases_markdown = get_test_cases(openai_api_key, selected_model, test_cases_prompt)
                        elif model_provider == "Google AI API":
                            test_cases_markdown = get_test_cases_google(google_api_key, google_model, test_cases_prompt)
                        elif model_provider == "Mistral API":
                            test_cases_markdown = get_test_cases_mistral(mistral_api_key, mistral_model, test_cases_prompt)

                        # Display the suggested mitigations in Markdown
                        st.markdown(test_cases_markdown)
                        break  # Exit the loop if successful
                    except Exception as e:
                        retry_count += 1
                        if retry_count == max_retries:
                            st.error(f"Error generating test cases after {max_retries} attempts: {e}")
                            test_cases_markdown = ""
                        else:
                            st.warning(f"Error generating test cases. Retrying attempt {retry_count+1}/{max_retries}...")
            
            st.markdown("")

            # Add a button to allow the user to download the test cases as a Markdown file
            st.download_button(
                label="Download Test Cases",
                data=test_cases_markdown,
                file_name="test_cases.md",
                mime="text/markdown",
            )
        else:
            st.error("Please generate a threat model first before requesting test cases.")