app.py

import os
import shutil


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

app = Flask(__name__)
app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0

@app.route('/',methods = ['GET', 'POST'])
def index():
    if request.method == 'POST':
        if 'file' not in request.files:
            flash('No files selected')
            return redirect('/')
        try:
            shutil.rmtree('./images')
        except:
            pass
        os.mkdir('./images')
        files = request.files.getlist("file")
        for f in files:
            f.save(os.path.join('./images', f.filename))
        for (dirpath, dirnames, filenames) in os.walk(app.config["IMAGES"]):
            files = filenames
            break
        app.config["FILES"] = files
        return redirect('/tagger', code=302)
    else:
        return render_template('index.html')

@app.route('/tagger')
def tagger():
    if (app.config["HEAD"] == len(app.config["FILES"])):
        return redirect(url_for('final'))
    directory = app.config["IMAGES"]
    image = app.config["FILES"][app.config["HEAD"]]
    labels = app.config["LABELS"]
    not_end = not(app.config["HEAD"] == len(app.config["FILES"]) - 1)
    print(not_end)
    return render_template('tagger.html', not_end=not_end, directory=directory, 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
    with open(app.config["OUT"],'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):
    images = app.config["IMAGES"]
    return send_file(images +'/'+f)

@app.route('/download')
def download():
    shutil.copyfile('out.csv', 'images/annotations.csv')
    shutil.make_archive('final', 'zip', 'images')
    return send_file('final.zip',
                     mimetype='text/csv',
                     attachment_filename='final.zip',
                     as_attachment=True)

if __name__ == "__main__":
    app.config["IMAGES"] = 'images'
    app.config["LABELS"] = []
    app.config["HEAD"] = 0
    app.config["OUT"] = "out.csv"
    with open("out.csv",'w') as f:
        f.write("image,id,name,xMin,xMax,yMin,yMax\n")
    app.run(debug="True")