Python API Security App – FastAPI + JWT + CustomTkinter GUI | FuzzuTech Project

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Code :


import customtkinter as ctk

import requests

from fastapi import FastAPI, Depends, HTTPException

from fastapi.security import OAuth2PasswordRequestForm

import threading

import uvicorn


# ==============================

# ⚡ FastAPI Backend (Embedded)

# ==============================


app = FastAPI()


valid_users = {

    "admin": "admin123",

    "user1": "pass123",

    "developer": "dev456"

}


@app.post("/token")

async def login(form_data: OAuth2PasswordRequestForm = Depends()):

    if valid_users.get(form_data.username) == form_data.password:

        return {"access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."}

    else:

        raise HTTPException(status_code=400, detail="Incorrect username or password")


def run_fastapi():

    uvicorn.run(app, host="127.0.0.1", port=8000)


# ==============================

# ✅ GUI Client Code

# ==============================


API_URL = "http://127.0.0.1:8000/token"


def authenticate_user(username, password):

    data = {"username": username, "password": password}

    try:

        response = requests.post(API_URL, data=data)

        return response.json()

    except Exception as e:

        return {"detail": f"Connection error: {str(e)}"}


class APISecurityApp(ctk.CTk):

    def __init__(self):

        super().__init__()

        self.title("🔐 API Security – JWT Auth + Rate Limiting")

        self.geometry("400x450")

        self.resizable(False, False)


        # Header

        self.label = ctk.CTkLabel(self, text="🌐 Secure API Authentication Client", font=("Arial", 20, "bold"))

        self.label.pack(pady=25)


        # Username Entry

        self.username_entry = ctk.CTkEntry(self, placeholder_text="Enter Username")

        self.username_entry.pack(pady=15, ipadx=10, ipady=8)


        # Password Entry

        self.password_entry = ctk.CTkEntry(self, placeholder_text="Enter Password", show="*")

        self.password_entry.pack(pady=15, ipadx=10, ipady=8)


        # Authenticate Button

        self.auth_button = ctk.CTkButton(self, text="Authenticate 🔑", command=self.authenticate)

        self.auth_button.pack(pady=25, ipadx=10, ipady=8)


        # Result Display

        self.result_label = ctk.CTkLabel(self, text="", wraplength=450, justify="center")

        self.result_label.pack(pady=15)


    def authenticate(self):

        username = self.username_entry.get().strip()

        password = self.password_entry.get().strip()


        if not username or not password:

            self.result_label.configure(text="❗ Please fill both Username & Password fields.", text_color="red")

            return


        result = authenticate_user(username, password)


        if "access_token" in result:

            self.result_label.configure(

                text=f"✅ Authentication Successful!\n\nAccess Token:\n{result['access_token']}",

                text_color="green"

            )

        else:

            self.result_label.configure(

                text=f"❌ Authentication Failed:\n{result.get('detail', 'Unknown error')}",

                text_color="red"

            )



# ==============================

# ✅ Run Everything

# ==============================


if __name__ == "__main__":

    # Start FastAPI in background thread

    threading.Thread(target=run_fastapi, daemon=True).start()


    # Set CTk Theme

    ctk.set_appearance_mode("Dark")       # Options: "System", "Light", "Dark"

    ctk.set_default_color_theme("blue")  # Options: "blue", "green", "dark-blue"


    # Start GUI

    app = APISecurityApp()

    app.mainloop()

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