Add password reset request view.

app/auth/views.py

 from flask import flash, redirect, render_template, request, url_for
 from flask_login import login_required, login_user, logout_user
 from . import auth
-from .forms import LoginForm
+from .forms import LoginForm, PasswordResetRequestForm
+from ..email import send_email
 from ..models import User
 
 
@@ -31,3 +32,18 @@ def logout():
 @auth.route('/register', methods=['GET', 'POST'])
 def register():
     return render_template('auth/register.html.j2')
+
+
+@auth.route('/reset', methods=['GET', 'POST'])
+def password_reset_request():
+    form = PasswordResetRequestForm()
+    if form.validate_on_submit():
+        user = User.query.filter_by(email=form.email.data.lower()).first()
+        if user:
+            token = user.generate_reset_token()
+            send_email(user.email, 'Reset Your Password',
+                       'auth/email/reset_password',
+                       user=user, token=token)
+        flash('An email with instructions to reset your password has been '
+              'sent to you.')
+        return redirect(url_for('auth.login'))