app.py

import gradio as gr
import json
import os
import boto3

from doc2json import process_docx

dump_controls = False
log_to_console = False


def add_text(history, text):
    history = history + [(text, None)]
    return history, gr.Textbox(value="", interactive=False)


def add_file(history, file):
    if file.name.endswith(".docx"):
        content = process_docx(file.name)
    else:
        with open(file.name, mode="rb") as f:
            content = f.read()

            if isinstance(content, bytes):
                content = content.decode('utf-8', 'replace')
            else:
                content = str(content)

    fn = os.path.basename(file.name)
    history = history + [(f'```{fn}\n{content}\n```', None)]

    gr.Info(f"File added as {fn}")

    return history

def submit_text(txt_value):
    return add_text([chatbot, txt_value], [chatbot, txt_value])

def undo(history):
    history.pop()
    return history

def dump(history):
    return str(history)

def load_settings():  
    # Dummy Python function, actual loading is done in JS  
    pass  

def save_settings(acc, sec, prompt, temp):  
    # Dummy Python function, actual saving is done in JS  
    pass  

def process_values_js():
    return """

    () => {

        return ["access_key", "secret_key", "token"];

    }

    """

def bot(message, history, aws_access, aws_secret, aws_token, temperature, max_tokens, model, region):
    try:
        prompt = "\n\n"
        for human, assi in history:
            if prompt is not None:
                prompt += f"Human: {human}\n\n"
            if assi is not None:
                prompt += f"Assistant: {assi}\n\n"
        if message:
            prompt += f"Human: {message}\n\n"
        prompt += f"Assistant:"

        if log_to_console:
            print(f"br_prompt: {str(prompt)}")

        body = json.dumps({
            "prompt": prompt,
            "max_tokens_to_sample": max_tokens,
            "temperature": temperature,
        })

        sess = boto3.Session(
            aws_access_key_id=aws_access,
            aws_secret_access_key=aws_secret,
            aws_session_token=aws_token,
            region_name=region)
        br = sess.client(service_name="bedrock-runtime")

        response = br.invoke_model(body=body, modelId=f"anthropic.{model}",
                                accept="application/json", contentType="application/json")
        response_body = json.loads(response.get('body').read())
        br_result = response_body.get('completion')

        history[-1][1] = br_result
        if log_to_console:
            print(f"br_result: {str(history)}")

    except Exception as e:
        raise gr.Error(f"Error: {str(e)}")

    return "", history


def import_history(history, file):
    with open(file.name, mode="rb") as f:
        content = f.read()

        if isinstance(content, bytes):
            content = content.decode('utf-8', 'replace')
        else:
            content = str(content)

    # Deserialize the JSON content to history
    history = json.loads(content)
    # The history is returned and will be set to the chatbot component
    return history

with gr.Blocks() as demo:
    gr.Markdown("# Amazon™️ Bedrock™️ Chat™️ (Nils' Version™️) feat. Anthropic™️ Claude-2™️")

    with gr.Accordion("Settings"):
        aws_access = gr.Textbox(label="AWS Access Key", elem_id="aws_access")
        aws_secret = gr.Textbox(label="AWS Secret Key", elem_id="aws_secret")
        aws_token = gr.Textbox(label="AWS Session Token", elem_id="aws_token")
        model = gr.Dropdown(label="Model", value="claude-v2:1", allow_custom_value=True, elem_id="model",
                            choices=["claude-v2:1", "claude-v2"])
        region = gr.Dropdown(label="Region", value="eu-central-1", allow_custom_value=True, elem_id="region",
                            choices=["eu-central-1", "us-east-1", "us-west-1"])
        temp = gr.Slider(0, 1, label="Temperature", elem_id="temp", value=1)
        max_tokens = gr.Slider(1, 200000, label="Max. Tokens", elem_id="max_tokens", value=4000)
        save_button = gr.Button("Save Settings")  
        load_button = gr.Button("Load Settings")  

        load_button.click(load_settings, js="""  

            () => {  

                let elems = ['#aws_access textarea', '#aws_secret textarea', '#aws_token textarea', '#temp input', '#max_tokens input', '#model', '#region'];

                elems.forEach(elem => {

                    let item = document.querySelector(elem);

                    let event = new InputEvent('input', { bubbles: true });

                    item.value = localStorage.getItem(elem.split(" ")[0].slice(1)) || '';

                    item.dispatchEvent(event);

                });

            }  

        """)

        save_button.click(save_settings, [aws_access, aws_secret, aws_token, temp, max_tokens, model, region], js="""  

            (acc, sec, tok, prompt, temp, ntok, model, region) => {  

                localStorage.setItem('aws_access', acc);  

                localStorage.setItem('aws_secret', sec);  

                localStorage.setItem('aws_token', tok);  

                localStorage.setItem('temp', document.querySelector('#temp input').value);  

                localStorage.setItem('max_tokens', document.querySelector('#max_tokens input').value);  

                localStorage.setItem('model', model);  

                localStorage.setItem('region', region);  

            }  

        """) 

    chatbot = gr.Chatbot(
        [],
        elem_id="chatbot",
        show_copy_button=True,
        height=350
    )

    with gr.Row():
        txt = gr.TextArea(
            scale=4,
            show_label=False,
            placeholder="Enter text and press enter, or upload a file",
            container=False,
            lines=3,            
        )
        submit_btn = gr.Button("🚀 Send", scale=0)
        submit_click = submit_btn.click(add_text, [chatbot, txt], [chatbot, txt], queue=False).then(
            bot, [txt, chatbot, aws_access, aws_secret, aws_token, temp, max_tokens, model, region], [txt, chatbot],
        )
        submit_click.then(lambda: gr.Textbox(interactive=True), None, [txt], queue=False)

    with gr.Row():
        btn = gr.UploadButton("📁 Upload", size="sm")
        undo_btn = gr.Button("↩️ Undo")
        undo_btn.click(undo, inputs=[chatbot], outputs=[chatbot])

        clear = gr.ClearButton(chatbot, value="🗑️ Clear")

    if dump_controls:
        with gr.Row():
            dmp_btn = gr.Button("Dump")
            txt_dmp = gr.Textbox("Dump")
            dmp_btn.click(dump, inputs=[chatbot], outputs=[txt_dmp])

    with gr.Accordion("Import/Export", open = False):
        import_button = gr.UploadButton("History Import")
        export_button = gr.Button("History Export")
        export_button.click(lambda: None, [chatbot], js="""

            (chat_history) => {

                // Convert the chat history to a JSON string

                const history_json = JSON.stringify(chat_history);

                // Create a Blob from the JSON string

                const blob = new Blob([history_json], {type: 'application/json'});

                // Create a download link

                const url = URL.createObjectURL(blob);

                const a = document.createElement('a');

                a.href = url;

                a.download = 'chat_history.json';

                document.body.appendChild(a);

                a.click();

                document.body.removeChild(a);

                URL.revokeObjectURL(url);

            }

            """)
        dl_button = gr.Button("File download")
        dl_button.click(lambda: None, [chatbot], js="""

            (chat_history) => {

                // Attempt to extract content enclosed in backticks with an optional filename

                const contentRegex = /```(\\S*\\.(\\S+))?\\n?([\\s\\S]*?)```/;

                const match = contentRegex.exec(chat_history[chat_history.length - 1][1]);

                if (match && match[3]) {

                    // Extract the content and the file extension

                    const content = match[3];

                    const fileExtension = match[2] || 'txt'; // Default to .txt if extension is not found

                    const filename = match[1] || `download.${fileExtension}`;

                    // Create a Blob from the content

                    const blob = new Blob([content], {type: `text/${fileExtension}`});

                    // Create a download link for the Blob

                    const url = URL.createObjectURL(blob);

                    const a = document.createElement('a');

                    a.href = url;

                    // If the filename from the chat history doesn't have an extension, append the default

                    a.download = filename.includes('.') ? filename : `${filename}.${fileExtension}`;

                    document.body.appendChild(a);

                    a.click();

                    document.body.removeChild(a);

                    URL.revokeObjectURL(url);

                } else {

                    // Inform the user if the content is malformed or missing

                    alert('Sorry, the file content could not be found or is in an unrecognized format.');

                }

            }

        """)
        import_button.upload(import_history, inputs=[chatbot, import_button], outputs=[chatbot])

    txt_msg = txt.submit(add_text, [chatbot, txt], [chatbot, txt], queue=False).then(
        bot, [txt, chatbot, aws_access, aws_secret, aws_token, temp, max_tokens, model, region], [txt, chatbot],
    )
    txt_msg.then(lambda: gr.Textbox(interactive=True), None, [txt], queue=False)
    file_msg = btn.upload(add_file, [chatbot, btn], [chatbot], queue=False, postprocess=False)

demo.queue().launch()