image_upload/upload.py

import os
from flask import Flask, render_template, redirect, request
from flask_wtf import FlaskForm
from flask_wtf.file import FileAllowed, FileField
from wtforms import (
    SubmitField,
)

# config me here
APP = Flask(__name__, static_folder="static")
APP.config["IMAGE_FOLDER"] = "static/images"
ALLOWED_FILES = ["jpg", "png", "gif", "webp"]

# don't config these lines
APP.config["SECRET_KEY"] = os.urandom(24)


class ImageUploadForm(FlaskForm):
    """Image upload form."""
    allowed = ", ".join(ALLOWED_FILES)
    image = FileField(
        "image:",
        validators=[
            FileAllowed(
                ALLOWED_FILES,
                f"Images only, please use any of the following file extensions: {allowed}",
            )
        ],
    )
    submit = SubmitField("Submit")


def saveimage(image):
    """Save the image to the folder"""
    image.save(os.path.join(APP.config["IMAGE_FOLDER"], image.filename))


@APP.route("/", methods=["GET", "POST"])
def index():
    """Upload route, a page to upload an image"""
    imageuploadform = ImageUploadForm()

    if request.method == "POST":
        if imageuploadform.validate_on_submit():
            saveimage(imageuploadform.image.data)

    uploaded_files = sorted(
        [
            os.path.join(APP.config["IMAGE_FOLDER"], file)
            for file in os.listdir(APP.config["IMAGE_FOLDER"])
        ],
        key=os.path.getctime,
    )

    return render_template(
        "upload.html",
        imageuploadform=imageuploadform,
        uploaded_files=uploaded_files
    )


if __name__ == "__main__":
    APP.debug = True
    APP.run(port=5000)