Adding WTForms to validate basic form input

backend/requirements.txt

@@ -3,3 +3,4 @@ cryptography
 flask
 gunicorn
 ldap3
+wtforms

backend/src/app.py

@@ -1,9 +1,19 @@
 import logging
 from flask import Flask, render_template
+from forms import UserLookupForm
 
 app = Flask(__name__)
 app.logger.setLevel(logging.INFO)
 
 @app.route('/')
 def index():
-    return render_template('landing.html')
+    if request.method == 'POST':
+        form = UserLookupForm(request.form)
+        if form.validate():
+            email = form.email.data
+        else:
+            app.logger.warn('Form validation failed')
+    else:
+        form = UserLookupForm(request.args)
+
+    return render_template('landing.html', form=form)

backend/src/forms.py

@@ -0,0 +1,4 @@
+from wtforms import Form, StringField, validators
+
+class UserLookupForm(Form):
+    email = StringField('Email Address', [validators.Email()])

backend/src/templates/landing.html

@@ -4,5 +4,12 @@
   <h1>FileDrop App</h1>
   <div>
     Form to select and upload files will go here.
+    <form method="POST">
+      <dl>
+        <dt>{{ form.email.label }}</dt>
+        <dd>{{ form.email()|safe }}</dd>
+      </dl>
+      <button type="submit">Next</button>
+    </form>
   </div>
 {% endblock %}