app.py

import flask
import os
import mypkg
from mypkg import draw
from mypkg.convert import Convert

app = flask.Flask(__name__, template_folder="./templates/")


@app.route('/')
def index():
    print('Route: /')
    return flask.render_template('index.html', mypkg_version=mypkg.__version__)

@app.route('/about')
def about():
    print('Route: /about')
    return flask.render_template('about.html')

@app.route('/user/<name>')
def user(name: str):
    print(f'Route: /user/{name}')
    return flask.render_template('user-name.html', name=name)

@app.route('/evaluate/<expression>')
def evaluate(expression: str):
    print(f'Route: /eval/{expression}')
    
    # You can do some processing here before rendering the template.
    result = eval(expression)
    print(f"\tResult: {result}")

    return flask.render_template('evaluate-expression.html', expression=expression, result=result)

@app.route('/show/circle')
def show_circle():
    img = draw.circle(width=500, height=500)
    image = Convert.cv_to_base64(img)
    return flask.render_template('show-image.html', image=image, imageLabel='Circle')

@app.route('/show/shapes')
def show_shapes():
    return flask.render_template('show-shapes.html')

@app.route('/draw', methods=['GET'])
def draw_target():
    """
    Try testing with:
        curl -X GET "localhost:5000/draw?target=blank"
        curl -X GET "localhost:5000/draw?target=circle"
        curl -X GET "localhost:5000/draw?target=rectangle"
    """
    # TODO: Call this from javascript for toggling between images.
    target = flask.request.args.get('target', default='blank', type=str)
    width = flask.request.args.get('width', default=500, type=int)
    height = flask.request.args.get('height', default=500, type=int)

    if target == 'blank':
        img = draw.blank(width=width, height=height)
    elif target == 'circle':
        img = draw.circle(width=width, height=height)
    elif target == 'rectangle':
        img = draw.rectangle(width=width, height=height)
    else:
        raise ValueError(f'Unsupported target: {target}')
    
    image = Convert.cv_to_base64(img)
    return flask.jsonify(
        isError=False,
        message='Success',
        statusCode=200,
        data=image
    )

@app.route('/echo', methods=['GET', 'POST'])
def echo():
    """
    Try testing with:
        curl -X GET "localhost:5000/echo?a=hello&b=world"
        curl -X POST "localhost:5000/echo?a=hello&b=world"
    """
    msg = 'Echo:'
    for key, val in flask.request.args.to_dict().items():
        msg += f'\n\t{key}={val}'
    if flask.request.method == 'GET':
        return flask.jsonify(
            isError=False,
            message='Success',
            statusCode=200,
            data=msg
        )
    else:
        print(msg)
        return flask.jsonify(
            isError=False,
            message='Success',
            statusCode=200,
            # data=msg
        )

@app.route('/debug/scrolling')
def debug_scrolling():
    return flask.render_template('scroll_debug.html')

if __name__ == '__main__':
    app.run(host='0.0.0.0',  port=int(os.environ.get('PORT', 7860)))