add downloading challenge link

nerochan/routes/auth.py

@@ -1,5 +1,7 @@
-from flask import Blueprint, render_template
-from flask import flash, redirect, url_for
+from datetime import datetime
+
+from flask import Blueprint, render_template, request
+from flask import flash, redirect, url_for, Response
 from flask_login import logout_user, current_user
 
 from nerochan.forms import UserForm, UserRegistration, UserChallenge
@@ -67,6 +69,14 @@ def challenge(handle):
         flash('Already logged in.')
         return redirect(url_for('main.index'))
 
+    if request.args.get('download'):
+        fn = int(datetime.utcnow().timestamp())
+        return Response(
+            user.challenge,
+            mimetype='text/plain',
+            headers={'Content-Disposition': f'attachment;filename=challenge_{fn}.txt'}
+        )
+
     if form.validate_on_submit():
         data = {
             'data': user.challenge,

nerochan/templates/auth/challenge.html

@@ -6,7 +6,7 @@
     <div class="row">
         <h1>challenge</h1>
         <p>Handle: {{ user.handle }}</p>
-        <p>Challenge: <span class="walletAddress">{{ user.challenge }}</span></p>
+        <p>Challenge: <span class="walletAddress">{{ user.challenge }}</span> (<a href="?download=1" style="text-decoration-style: dashed;">download</a>)</p>
         <p>Wallet Address: <span class="walletAddress">{{ user.wallet_address }}</span></p>
         {% include 'includes/form.html' %}
     </div>