Write backend

.gitignore

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+__pycache__
+venv
+surprise.txt

Dockerfile

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+FROM xxx
+
+# Install flask and elm
+
+# Copy files
+
+# Compile elm
+
+# Run flask
+

README.md

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+# Surprise countdown
+
+This is a web application for revealing a surprise at a given time.
+
+
+

backend/app.py

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+import os
+import datetime
+import base64
+import random
+import string
+from dateutil import parser as dt_parser
+from toolz import compose
+from toolz.curried import map, filter
+from atomicwrites import atomic_write
+
+SURPRISE_TITLE = os.environ.get("SURPRISE_TITLE", "Surprise")
+print("SURPRISE_TITLE =", SURPRISE_TITLE)
+
+SURPRISE_STORE_FILE = os.environ.get("SURPRISE_STORE_FILE", "surprise.txt")
+print("SURPRISE_STORE_FILE =", SURPRISE_STORE_FILE)
+
+SURPRISE_SECRET = os.environ.get("SURPRISE_SECRET")
+print("SURPRISE_SECRET =", SURPRISE_SECRET)
+assert bool(SURPRISE_SECRET)
+
+SURPRISE_ASSET_DIR = os.environ.get("SURPRISE_ASSET_DIR", "../surprise-assets/gender-reveal")
+print("SURPRISE_ASSET_DIR =", SURPRISE_ASSET_DIR)
+assert os.path.isdir(SURPRISE_ASSET_DIR)
+
+SURPRISE_REVEAL_DATETIME = dt_parser.parse(
+    os.environ.get(
+        "SURPRISE_REVEAL_DATETIME",
+        (datetime.datetime.now() + datetime.timedelta(minutes=5)).isoformat()
+    )
+)
+print("SURPRISE_REVEAL_DATETIME =", SURPRISE_REVEAL_DATETIME)
+
+def _get_surprise_assets():
+    IMG_TYPES = (
+        '.png',
+        '.jpeg',
+        '.jpg',
+        '.svg',
+        '.apng',
+        '.gif',
+        '.webp',
+        '.avif'
+    )
+    _, _, files = next(os.walk(SURPRISE_ASSET_DIR))
+    surprise_assets = compose(
+        dict,            
+        map(lambda xy: (xy[0], os.path.join('/assets', ''.join(xy)))),
+        filter(lambda xy: xy[1] in IMG_TYPES),
+        map(lambda s: os.path.splitext(s)),
+        map(lambda s: s.lower().strip())
+    )(files)
+    if '_null' not in surprise_assets:
+        surprise_assets['_null'] = os.path.join('/static', '_null.png')
+    if '_secret' not in surprise_assets:
+        surprise_assets['_secret'] = os.path.join('/static', '_secret.png')
+    return surprise_assets
+
+SURPRISE_ASSETS = _get_surprise_assets()
+assert len(SURPRISE_ASSETS) >= 4
+print("SURPRISE_ASSETS =", SURPRISE_ASSETS)
+
+
+from flask import (
+    Flask, jsonify, send_from_directory, render_template, request, url_for,
+    redirect, flash
+)
+app = Flask(__name__)
+app.config['SECRET_KEY'] = ''.join(random.choice(string.ascii_lowercase) for i in range(20))
+
+@app.route('/')
+def index():
+    return render_template('index.html', title=SURPRISE_TITLE)
+
+@app.route('/assets/<path:path>')
+def assets(path):
+    return send_from_directory(SURPRISE_ASSET_DIR, path)
+
+@app.route('/get-surprise.json')
+def get_surprise_json():
+    diff = (SURPRISE_REVEAL_DATETIME - datetime.datetime.now()).total_seconds()
+    if os.path.isfile(SURPRISE_STORE_FILE):
+        if diff < 0:
+            with open(SURPRISE_STORE_FILE) as f:
+                surprise = f.read()
+        else:
+            surprise = '_secret'
+    else:
+        surprise = '_null'
+    return jsonify({
+        'diff_seconds': diff,
+        'surprise': surprise,
+        'asset': SURPRISE_ASSETS[surprise]
+    })
+
+@app.route('/set-surprise')
+def set_surprise():
+    enum = [v for v in SURPRISE_ASSETS.keys() if v not in ('_null', '_secret')]
+    return render_template('set_surprise.html', title=SURPRISE_TITLE, enum=enum)
+
+@app.route('/post-surprise', methods=['POST'])
+def post_surprise():
+    if request.form.get('password') != SURPRISE_SECRET:
+        flash("Password is wrong")
+        return redirect(url_for('set_surprise'))
+    value = request.form.get('surprise')
+    if value not in SURPRISE_ASSETS.keys():
+        flash("Invalid value '%s'" % value)
+        return redirect(url_for('set_surprise'))
+    with atomic_write(SURPRISE_STORE_FILE, overwrite=True) as f:
+        f.write(value)
+    flash("Value was successfully set to '%s'" % value)
+    return redirect(url_for('index'))
+

backend/requirements.pip

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+atomicwrites==1.4.0
+click==7.1.2
+Flask==1.1.2
+itsdangerous==1.1.0
+Jinja2==2.11.3
+MarkupSafe==1.1.1
+python-dateutil==2.8.1
+six==1.16.0
+toolz==0.11.1
+Werkzeug==1.0.1

backend/templates/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{ title }}</title>
+  </head>
+
+  <body>
+    {% with messages = get_flashed_messages() %}
+    {% if messages %}
+    <ul class="messages">
+      {% for message in messages %}
+      <li>{{ message }}</li>
+      {% endfor %}
+    </ul>
+    {% endif %}
+    {% endwith %}
+    <h1 style="color: blue">Hei</h1>
+    <p>TODO</p>
+  </body>
+</html>
+

backend/templates/set_surprise.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{ title }}</title>
+  </head>
+
+  <body>
+    {% with messages = get_flashed_messages() %}
+    {% if messages %}
+    <ul class="messages">
+      {% for message in messages %}
+      <li>{{ message }}</li>
+      {% endfor %}
+    </ul>
+    {% endif %}
+    {% endwith %}
+    <form class="form-signin" method="POST" action="/post-surprise">
+      <h2 class="form-signin-heading">Set surprise</h2>
+      {% for v in enum %}
+      <div>
+        <input type="radio" name="surprise" id="{{ v }}" value="{{ v }}">
+        <label for="{{ v }}">{{ v }}</label>
+      </div>
+      {% endfor %}
+      <div>
+        <input class="form-control" type="password" required name="password" placeholder="Password">
+      </div>
+      <div>
+        <button class="btn btn-lg btn-primary btn-block" type="submit">Set surprise</button>
+      </div>
+    </form>
+  </body>
+</html>
+
+