app.py

import os
import shutil
import uuid
import logging

from flask import Flask, redirect, url_for, request, flash, session
from flask import render_template
from flask import send_file

logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO)

UPLOAD_FOLDER = '/app/images'
OUT_FOLDER = '/app/anno'

app = Flask(__name__)
app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0
app.config["SECRET_KEY"] = '#thaistartsfirst!'
app.config["IMAGES"] = UPLOAD_FOLDER
app.config["OUT"] = OUT_FOLDER
app.config["LABELS"] = []
app.config["HEAD"] = 0
app.config["SESSION_PERMANENT"] = False

# Ensure the upload directory exists
if not os.path.exists(UPLOAD_FOLDER):
    os.makedirs(UPLOAD_FOLDER)
if not os.path.exists(OUT_FOLDER):
    os.makedirs(OUT_FOLDER)


def get_anno_path(user_id):
    return os.path.join(OUT_FOLDER, f'{user_id}.csv')


def get_images_directory(user_id):
    return os.path.join(UPLOAD_FOLDER, f'{user_id}')


@app.route('/', methods=['GET', 'POST'])
def index():
    user_id = session.get('_id')
    # user_id = request.cookies.get('session')
    if user_id is None:
        user_id = uuid.uuid4()
        session['_id'] = user_id
        logger.info(user_id)
        anno_path = get_anno_path(user_id)
        with open(anno_path, 'w') as f:
            f.write("image,id,name,xMin,xMax,yMin,yMax\n")

    if request.method == 'POST':
        if 'file' not in request.files:
            flash('No files selected')
            return redirect('/')
        img_dir = get_images_directory(user_id)
        try:
            os.makedirs(img_dir)
        except FileExistsError:
            logger.info('user already has an active session')
        files = request.files.getlist("file")
        filenames = []
        for f in files:
            f.save(os.path.join(img_dir, f.filename))
            filenames.append(f.filename)
        app.config["FILES"] = filenames
        # logger.info(app.config["FILES"], app.config["HEAD"])
        return redirect('/tagger', code=302)
    else:
        return render_template('index.html')


@app.route('/tagger')
def tagger():
    if (app.config["HEAD"] == len(app.config["FILES"])):
        # done annotating the batch of images
        app.config["HEAD"] = 0
        return redirect(url_for('final'))
    user_id = session.get('_id')
    img_dir = get_images_directory(user_id)  # app.config["IMAGES"] + f'/{user_id}'
    image = app.config["FILES"][app.config["HEAD"]]
    labels = app.config["LABELS"]
    not_end = not(app.config["HEAD"] == len(app.config["FILES"]) - 1)
    return render_template('tagger.html', not_end=not_end, directory=img_dir, image=image, labels=labels, head=app.config["HEAD"] + 1, len=len(app.config["FILES"]))


@app.route('/next')
def next():
    image = app.config["FILES"][app.config["HEAD"]]
    app.config["HEAD"] = app.config["HEAD"] + 1
    user_id = session.get("_id")
    anno_path = get_anno_path(user_id)
    with open(anno_path, 'a+') as f:
        for label in app.config["LABELS"]:
            f.write(image + "," +
            label["id"] + "," +
            label["name"] + "," +
            str(round(float(label["xMin"]))) + "," +
            str(round(float(label["xMax"]))) + "," +
            str(round(float(label["yMin"]))) + "," +
            str(round(float(label["yMax"]))) + "\n")
    app.config["LABELS"] = []
    return redirect(url_for('tagger'))

@app.route("/final")
def final():
    return render_template('final.html')

@app.route('/add/<id>')
def add(id):
    xMin = request.args.get("xMin")
    xMax = request.args.get("xMax")
    yMin = request.args.get("yMin")
    yMax = request.args.get("yMax")
    app.config["LABELS"].append({"id":id, "name":"", "xMin":xMin, "xMax":xMax, "yMin":yMin, "yMax":yMax})
    return redirect(url_for('tagger'))

@app.route('/remove/<id>')
def remove(id):
    index = int(id) - 1
    del app.config["LABELS"][index]
    for label in app.config["LABELS"][index:]:
        label["id"] = str(int(label["id"]) - 1)
    return redirect(url_for('tagger'))

@app.route('/label/<id>')
def label(id):
    name = request.args.get("name")
    app.config["LABELS"][int(id) - 1]["name"] = name
    return redirect(url_for('tagger'))

@app.route('/image/<f>')
def images(f):
    user_id = session.get('_id')
    img_dir = get_images_directory(user_id)
    img_path = os.path.join(img_dir, f'{f}')
    return send_file(img_path)

@app.route('/download')
def download():
    user_id = session.get('_id')
    anno_path = get_anno_path(user_id)
    img_dir = get_images_directory(user_id)
    shutil.copyfile(anno_path, f'{img_dir}/annotations_pascal_voc.csv')
    shutil.make_archive('final', 'zip', img_dir)
    return send_file('final.zip',
                     mimetype='text/csv',
                     download_name='final.zip',
                     as_attachment=True)

if __name__ == "__main__":
    app.run(debug="True")