rip.py

import os
import urllib.parse
from io import BytesIO
import textwrap

from flask import Flask, request, send_file, jsonify
from PIL import Image, ImageDraw, ImageFont

app = Flask(__name__)
base_url = 'https://ultra-rip.herokuapp.com/'
font = ImageFont.truetype("Slackey/Slackey-Regular.ttf", 25)

def gravestone_png(msg):
    msg = '\n'.join(textwrap.wrap(msg, 20))
    rip_img = Image.open('rip.png')

    canvas = ImageDraw.Draw(rip_img)

    center = rip_img.width//2 - 20
    text_width, _ = canvas.multiline_textsize(msg, font)

    canvas.multiline_text((center - text_width//2, 350), msg, 'black', font, align='center', )
    del canvas

    img_io = BytesIO()
    rip_img.save(img_io, 'PNG')
    img_io.seek(0)
    return img_io

@app.route('/rip', methods=['POST'])
def rip_cmd():
    img_query = urllib.parse.urlencode({'text': request.form['text']})
    return jsonify({
        'response_type': 'in_channel',
        'text': 'rip...',
        'attachments': [
            {
                'image_url': '{}/gen_img?{}'.format(base_url, img_query),
            }
        ]
    })

@app.route('/gen_img', methods=['GET'])
@app.route('/gen_img.png', methods=['GET'])
def gen_img():
    return send_file(gravestone_png(request.args.get('text', 'dead...')), mimetype='image/png')

def start_slack():
    port = int(os.environ.get('PORT', 5000))
    app.run(host='0.0.0.0', port=port, debug=True)

if __name__ == '__main__':
    start_slack()