Nginx configuration to cache transcoded media

docker/nginx/conf.dev

@@ -26,23 +26,59 @@ http {
     keepalive_timeout  65;
 
     #gzip  on;
+    proxy_cache_path /tmp/funkwhale-transcode levels=1:2 keys_zone=transcode:10m max_size=1g inactive=24h use_temp_path=off;
 
     server {
         listen 6001;
         charset     utf-8;
         client_max_body_size 20M;
+
+        # global proxy pass config
+        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;
+        proxy_set_header X-Forwarded-Host   localhost:8080;
+        proxy_set_header X-Forwarded-Port   8080;
+        proxy_redirect off;
+
         location /_protected/media {
             internal;
             alias   /protected/media;
         }
-        location / {
-            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;
+        location = /transcode-auth {
+            # needed so we can authenticate transcode requests, but still
+            # cache the result
+            internal;
+            set $query '';
+            # ensure we actually pass the jwt to the underlytin auth url
+            if ($request_uri ~* "[^\?]+\?(.*)$") {
+                set $query $1;
+            }
             proxy_set_header X-Forwarded-Host   localhost:8080;
             proxy_set_header X-Forwarded-Port   8080;
-            proxy_redirect off;
+            proxy_pass http://api:12081/api/v1/trackfiles/viewable/?$query;
+            proxy_pass_request_body off;
+            proxy_set_header        Content-Length "";
+        }
+
+        location /api/v1/trackfiles/transcode/ {
+            # this block deals with authenticating and caching transcoding
+            # requests. Caching is heavily recommended as transcoding
+            # is a CPU intensive process.
+            auth_request /transcode-auth;
+            if ($args ~ (.*)jwt=[^&]*(.*)) {
+                set $cleaned_args $1$2;
+            }
+            proxy_cache_key "$scheme$request_method$host$uri$is_args$cleaned_args";
+            proxy_cache transcode;
+            proxy_cache_valid 200 7d;
+            proxy_ignore_headers "Set-Cookie";
+            proxy_hide_header "Set-Cookie";
+            add_header X-Cache-Status $upstream_cache_status;
+            proxy_pass http://api:12081;
+        }
+        location / {
             proxy_pass   http://api:12081/;
         }
     }