Add a public web front end alongside the CLI

Extracts the CLI pipeline into a reusable Pipeline class and exposes it
via a dependency-free JDK HttpServer (upload form, bounded worker pool
with 503 on overload, per-request size/time limits, no persisted
uploads), plus nginx/systemd deploy templates and Impressum/Datenschutz
placeholders for public operation.

Change-Id: I6e8e7afa3c4b1082cdf9e82da0fae0b5b49470ad

1 files changed, 39 insertions, 0 deletions

diff --git a/deploy/nginx-aendggner.conf b/deploy/nginx-aendggner.conf
new file mode 100644
index 0000000..f4667fb
--- /dev/null
+++ b/deploy/nginx-aendggner.conf
@@ -0,0 +1,39 @@
+# Reverse-Proxy-Vorlage für den ÄndGgner-Webserver. Übernimmt TLS-Terminierung und
+# Rate-Limiting; der Java-Prozess selbst bindet nur an 127.0.0.1 (siehe aendggner-web.service).
+#
+# Vor dem Einsatz anpassen: server_name, ssl_certificate(_key) (z. B. via certbot).
+
+limit_req_zone $binary_remote_addr zone=aendggner:10m rate=10r/m;
+
+server {
+    listen 80;
+    listen [::]:80;
+    server_name aendggner.example.org;
+    return 301 https://$host$request_uri;
+}
+
+server {
+    listen 443 ssl http2;
+    listen [::]:443 ssl http2;
+    server_name aendggner.example.org;
+
+    ssl_certificate     /etc/letsencrypt/live/aendggner.example.org/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/aendggner.example.org/privkey.pem;
+
+    # Muss zum Upload-Limit von UploadHandler (MAX_BODY_BYTES, aktuell 40 MB) passen.
+    client_max_body_size 40m;
+
+    location / {
+        limit_req zone=aendggner burst=5 nodelay;
+
+        proxy_pass http://127.0.0.1:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # Etwas großzügiger als der 30s-Timeout der Anwendung, damit deren eigene
+        # 504-Antwort den Nutzer erreicht statt eines nginx-eigenen Timeouts.
+        proxy_read_timeout 35s;
+    }
+}