test.py

from fastapi import FastAPI, Depends , Request,WebSocket
from fastapi.security import OAuth2PasswordBearer
import requests
from jose import jwt
import webbrowser
import base64
import logging
import time
import asyncio
import PyPDF2
from docx import Document
from PIL import Image
import pytesseract
import io

app = FastAPI()
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")





# Replace these with your own values from the Google Developer Console
# GOOGLE_CLIENT_ID = ""
# GOOGLE_CLIENT_SECRET = ""
# GOOGLE_REDIRECT_URI = ""

GOOGLE_CLIENT_ID = "485753721652-5uta3e18va2g6cnkldib2d68q39t4vod.apps.googleusercontent.com"
GOOGLE_CLIENT_SECRET = "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"
GOOGLE_REDIRECT_URI = "https://omkar008-receipt-radar-test.hf.space/auth/google"
# Configure the logger
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)


@app.get("/")
async def login_google():
    # oauth_url = f"https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={GOOGLE_CLIENT_ID}&redirect_uri={GOOGLE_REDIRECT_URI}&scope=openid%20profile%20email&access_type=offline"
    
    #Below is the URL to prompt the user to login to his specified gmail account and also give a readonly access to his gmail
    oauth_url = f"https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={GOOGLE_CLIENT_ID}&redirect_uri={GOOGLE_REDIRECT_URI}&scope=openid%20profile%20email%20https://www.googleapis.com/auth/gmail.readonly&access_type=offline"
    oauth_url_hr = f"https://accounts.google.com/o/oauth2/auth?response_type=code&client_id={GOOGLE_CLIENT_ID}&redirect_uri={GOOGLE_REDIRECT_URI}&scope=openid%20profile%20email%20https://www.googleapis.com/auth/gmail.readonly&access_type=offline&state=receipts"
    webbrowser.open(oauth_url)
    return {
        "url_hr": oauth_url_hr
    }

@app.post("/auth/google")
async def auth_google(request: Request):

    data = await request.json()
    code = data.get("access_token")
    print("Printing the access token")
    print(code)
    if not code:
        raise HTTPException(status_code=400, detail="Authorization code not provided")
    access_token_new = code

    user_info = requests.get("https://www.googleapis.com/oauth2/v1/userinfo", headers={"Authorization": f"Bearer {access_token_new}"})
    page_token = None
    messages = []
    jobs_query = "subject:receipt OR subject:receipts has:attachment "

    while True:
        # Construct Gmail API request with pageToken
        gmail_url = f"https://www.googleapis.com/gmail/v1/users/me/messages?q={jobs_query}"
        if page_token:
            gmail_url += f"&pageToken={page_token}"

        gmail_response = requests.get(gmail_url, headers={"Authorization": f"Bearer {access_token_new}"})
        gmail_data = gmail_response.json()
        
        # Check if there are messages in the response
        if "messages" in gmail_data:
            messages.extend(gmail_data["messages"])

        # Check if there are more pages
        if "nextPageToken" in gmail_data:
            page_token = gmail_data["nextPageToken"]
        else:
            break  # No more pages, exit the loop

    attachments = []
    attachment_no = 0
    data_new = {}
    for i,message in enumerate(messages) :
        # print(i)
        # print(message)

        if message:
            message_id = message.get("id")
            print(message_id)
            if message_id:
                message_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}"
                message_response = requests.get(message_url, headers={"Authorization": f"Bearer {access_token_new}"})
                message_data = message_response.json()

                # Check for parts in the message payload
                if "payload" in message_data and "parts" in message_data["payload"]:
                    for part in message_data["payload"]["parts"]:
                        if "body" in part and "attachmentId" in part["body"]:
                            attachment_id = part["body"]["attachmentId"]
                            attachment_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}/attachments/{attachment_id}"
                            attachment_response = requests.get(attachment_url, headers={"Authorization": f"Bearer {access_token_new}"})
                            attachment_data = attachment_response.json()
                            data = attachment_data.get("data")
                            filename = part.get("filename", "untitled.txt")

                            if data:
                                data_new[filename]=data
                                attachment_content = base64.urlsafe_b64decode(data.encode("UTF-8"))
                                attachment_no+=1

    return {"attachment_count":attachment_no,"attachment_content":data_new}


async def send_chunked_data(websocket: WebSocket, filename: str, data: str):
    chunk_size = 1024  # Set an appropriate chunk size
    for i in range(0, len(data), chunk_size):
        await websocket.send_json({"filename": filename, "data_chunk": data[i:i + chunk_size]})
        await asyncio.sleep(0.4)
    await websocket.send_text("FinishedThisAttachment")


async def extract_text_from_pdf(pdf_data):
    with io.BytesIO(pdf_data) as pdf_file:
        pdf_reader = PyPDF2.PdfReader(pdf_file)
        text = ""
        for page_num in range(len(pdf_reader.pages)):
            page = pdf_reader.pages[page_num]
            text += page.extract_text()
        return text

async def extract_text_from_docx(docx_data):
    doc = Document(io.BytesIO(docx_data))
    text = ""
    for para in doc.paragraphs:
        text += para.text + "\n"
    return text

async def extract_text_from_attachment(filename, data):
    if filename.endswith('.pdf'):
        return await extract_text_from_pdf(data)
    elif filename.endswith('.docx'):
        return await extract_text_from_docx(data)
    else:
        # Add handling for other document types if needed
        return "Unsupported document type"



@app.websocket("/ws")
async def test_websocket(websocket: WebSocket):
    await websocket.accept()
    logger.info("Hi hi succefull in connecting !!")

    data = await websocket.receive_text()
    logger.info("Received JSON data: %s", data)


    
    def get_messages(code:str):
  
        logging.info("entered into the get_messages")
        access_token = code
        print("printing access_token")
        print(access_token)
        page_token = None
        messages = []
        jobs_query = "subject:receipt OR subject:receipts has:attachment"

        while True:
            # Construct Gmail API request with pageToken
            print("into the gmail")
            gmail_url = f"https://www.googleapis.com/gmail/v1/users/me/messages?q={jobs_query}"

            if page_token:
                gmail_url += f"&pageToken={page_token}"

            gmail_response = requests.get(gmail_url, headers={"Authorization": f"Bearer {access_token}"})
            logging.info(f"{gmail_response}")
            print(gmail_response)
            gmail_data = gmail_response.json()
            
            # Check if there are messages in the response
            if "messages" in gmail_data:
                messages.extend(gmail_data["messages"])

            # Check if there are more pages
            if "nextPageToken" in gmail_data:
                page_token = gmail_data["nextPageToken"]
            else:
                break  # No more pages, exit the loop
        print("returning the messages")

        unique_thread_ids = set()

        filtered_data_list = []

        for entry in messages:
            thread_id = entry['threadId']
            if thread_id not in unique_thread_ids:
                unique_thread_ids.add(thread_id)
                filtered_data_list.append(entry)
        

        return filtered_data_list
    
    async def event_generator(code:str):
        
        logging.info("entered into the event_generator")

        access_token = code
        messages=get_messages(access_token)
        print(len(messages))

        attachments = []
        prev_data=""
        data_new={}
        attachment_no=0
        batch_size = 5
        prev_filename = None

        for i,message in enumerate(messages) :
            print(i)
            logging.info(f"{i}")
            logging.info(f"{message}")

            print(message)

            if message:
                message_id = message.get("id")
                thread_id = message.get("threadId")
                print(message_id)
                if message_id:
                    message_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}"
                    message_response = requests.get(message_url, headers={"Authorization": f"Bearer {access_token}"})
                    message_data = message_response.json()

                    
                    # Check for parts in the message payload
                    if "payload" in message_data and "parts" in message_data["payload"]:
                        for part in message_data["payload"]["parts"]:
                            if "body" in part and "attachmentId" in part["body"]:
                                attachment_id = part["body"]["attachmentId"]
                                print(attachment_id)
                                attachment_url = f"https://www.googleapis.com/gmail/v1/users/me/messages/{message_id}/attachments/{attachment_id}"
                                attachment_response = requests.get(attachment_url, headers={"Authorization": f"Bearer {access_token}"})
                                attachment_data = attachment_response.json()
                                data = attachment_data.get("data",{})
                                filename = part.get("filename", "untitled.txt")
                                if data:
                                    data_new[filename]=str(data[:10])
                                    attachment_content = base64.urlsafe_b64decode(data)
                                    logging.info(filename)
                                    extracted_text = await extract_text_from_attachment(filename, attachment_content)
                                    logging.info(extracted_text)
                                    await send_chunked_data(websocket, filename, data)

                                    attachment_no+=1

        await websocket.send_text("CompletedFetchingMessages")

    await event_generator(data)
    logging.info("Closing connection")
    await websocket.close()
    
@app.get("/token")
async def get_token(token: str = Depends(oauth2_scheme)):
    return jwt.decode(token, GOOGLE_CLIENT_SECRET, algorithms=["HS256"])