Flask app progress

docker/router-dash/app/action_apply_upstream_dns.py

@@ -0,0 +1,39 @@
+from flask import Blueprint, request, redirect, flash
+from auth import require_level
+from config_utils import load_core, save_core, verify_core_hash, apply_msg
+import sanitize
+
+bp = Blueprint('action_apply_upstream_dns', __name__)
+
+
+
+@bp.route('/action/apply_upstream_dns', methods=['POST'])
+@require_level('administrator')
+def apply_upstream_dns():
+    strict_order     = 'strict_order' in request.form
+    cache_size_raw   = request.form.get('cache_size', '').strip()
+    upstream_servers = [sanitize.ip(s) for s in request.form.getlist('upstream_servers') if s.strip()]
+    upstream_servers = [s for s in upstream_servers if s]
+
+    try:
+        cache_size = int(cache_size_raw)
+        if cache_size < 0:
+            raise ValueError
+    except (ValueError, TypeError):
+        flash('Cache Size must be a non-negative integer.', 'error')
+        return redirect('/view/view_upstream_dns')
+
+    if not verify_core_hash(request.form.get('config_hash', '')):
+        flash('Configuration was modified by another session. Please refresh and try again.', 'error')
+        return redirect('/view/view_upstream_dns')
+
+    core = load_core()
+    core.setdefault('upstream_dns', {}).update({
+        'strict_order':    strict_order,
+        'cache_size':      cache_size,
+        'upstream_servers': upstream_servers,
+    })
+    save_core(core)
+
+    flash(apply_msg(), 'success')
+    return redirect('/view/view_upstream_dns')