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"""Authentication routes"""
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# pylint: disable=invalid-name
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import os
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import io
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import base64
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from urllib.parse import urlparse
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from PIL import Image
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from flask import Blueprint, render_template, session, redirect, url_for, \
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request, flash, current_app, abort, send_from_directory
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from app import db
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from app.models import Tile
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tiles_bp = Blueprint('tiles', __name__)
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def valid_tile(z, x, y):
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"""Returns true if the tile coordinates are valid"""
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# check z in [0, 22]
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if z < 0 or z > 22:
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return False
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# check x in [0, 2^zoom[
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if x < 0 or x >= 2**z:
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return False
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# check y in [0, 2^zoom[
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if y < 0 or y >= 2 ** z:
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return False
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return True
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@tiles_bp.route('/tiles/upload')
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def upload():
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"""Render an upload form"""
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return '''
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<!doctype html>
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<title>Upload new File</title>
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<h1>Upload new File</h1>
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<form action="/tiles/1/0/1" method=post enctype=multipart/form-data>
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<input type=file name=file>
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<input type=submit value=Upload>
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</form>
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'''
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@tiles_bp.route('/tiles/<int:z>/<int:x>/<int:y>', methods=['GET'])
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def get_tile(z, x, y):
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"""Serves a tile"""
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if not valid_tile(z, x, y):
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return abort(404)
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folder = current_app.config['UPLOAD_FOLDER']
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filename = f'{z}-{x}-{y}.png'
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if not os.path.isfile(os.path.join(folder, filename)):
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return send_from_directory('static', 'missing.png')
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return send_from_directory('../' + folder, filename)
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@tiles_bp.route('/tiles/<int:z>/<int:x>/<int:y>', methods=['POST'])
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def create_tile(z, x, y):
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if not valid_tile(z, x, y):
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return abort(404)
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image_bytes = None
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# try to read file from request.files (byte-stream)
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if 'file' in request.files:
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image_bytes = request.files['file'].stream
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# try to read file from form (base64 encoded dataURL)
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if image_bytes is None and ('file' in request.form):
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parsed_url = urlparse(request.form['file'])
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head, data = parsed_url.path.split(',', 1)
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image_bytes = io.BytesIO(base64.b64decode(data))
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if image_bytes is None:
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flash('No file part')
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return redirect(url_for('index'))
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try:
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image = Image.open(image_bytes)
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image = image.resize((256, 256))
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except OSError:
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flash('cannot read image')
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return redirect(url_for('index'))
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folder = current_app.config['UPLOAD_FOLDER']
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filename = f'{z}-{x}-{y}.png'
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image.save(os.path.join(folder, filename))
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flash('Uploaded tile successfully')
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return redirect(url_for('index'))
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