Merge branch 'feld-varnish' into 'develop'

Add example Varnish VCL

See merge request pleroma/pleroma!77

installation/pleroma.vcl

@@ -0,0 +1,132 @@
+vcl 4.0;
+import std;
+
+backend default {
+    .host = "127.0.0.1";
+    .port = "4000";
+}
+
+# ACL for IPs that are allowed to PURGE data from the cache
+acl purge {
+    "127.0.0.1";
+}
+
+sub vcl_recv {
+    # Redirect HTTP to HTTPS
+    if (std.port(server.ip) != 443) {
+        set req.http.x-redir = "https://" + req.http.host + req.url;
+        return (synth(750, ""));
+    }
+
+    # Pipe if WebSockets request is coming through
+    if (req.http.upgrade ~ "(?i)websocket") {
+        return (pipe);
+    }
+
+    # Allow purging of the cache
+    if (req.method == "PURGE") {
+        if (!client.ip ~ purge) {
+          return(synth(405,"Not allowed."));
+        }
+        return(purge);
+    }
+
+    # Pleroma MediaProxy - strip headers that will affect caching
+    if (req.url ~ "^/proxy/") {
+        unset req.http.Cookie;
+        unset req.http.Authorization;
+        unset req.http.Accept;
+        return (hash);
+    }
+
+    # Hack to enable a Terms of Service page missing from Pleroma
+    if (req.url ~ "^/about/more$") {
+        set req.http.x-redir = "https://" + req.http.host + "/static/terms-of-service.html";
+        return (synth(750, ""));
+    }
+
+    # Strip headers that will affect caching from all other static content
+    # This also permits caching of individual toots and AP Activities
+    if ((req.url ~ "^/(media|notice|objects|static)/") ||
+    (req.url ~ "^/(activities/|api/v1/statuses/\d+$)") ||
+    (req.url ~ "^/(activities/|api/v1/statuses/\d+/card$)") ||
+    (req.url ~ "(?i)\.(html|js|css|jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|svg|swf|ttf|pdf|woff|woff2)$"))
+    {
+      unset req.http.Cookie;
+      unset req.http.Authorization;
+      return (hash);
+    }
+
+    # Everything else should just be piped to Pleroma
+    return (pipe);
+}
+
+sub vcl_backend_response {
+    # gzip text content
+    if (beresp.http.content-type ~ "(text|text/css|application/x-javascript|application/javascript)") {
+      set beresp.do_gzip = true;
+    }
+
+    # etags are bad
+    unset beresp.http.etag;
+
+    # Don't cache objects that require authentication
+    if (beresp.http.Authorization && !beresp.http.Cache-Control ~ "public") {
+      set beresp.uncacheable = true;
+      return (deliver);
+    }
+
+    # Default object caching of 86400s;
+    set beresp.ttl = 86400s;
+    # Allow serving cached content for 6h in case backend goes down
+    set beresp.grace = 6h;
+
+    # Do not cache 5xx responses
+    if (beresp.status == 500 || beresp.status == 502 || beresp.status == 503 || beresp.status == 504) {
+      set beresp.uncacheable = true;
+      return (abandon);
+    }
+
+    # Do not cache redirects and errors
+    if ((beresp.status >= 300) && (beresp.status < 500)) {
+        set beresp.uncacheable = true;
+        set beresp.ttl = 30s;
+        return (deliver);
+    }
+
+    # Pleroma MediaProxy internally sets headers properly
+    if (bereq.url ~ "^/proxy/") {
+      return (deliver);
+    }
+
+    # Strip cache-restricting headers from Pleroma on static content that we want to cache
+    # Also enable streaming of cached content to clients (no waiting for Varnish to complete backend fetch)
+    if ((bereq.url ~ "^/(notice|objects)/") ||
+    (bereq.url ~ "^/(activities/|api/v1/statuses/\d+$)") ||
+    (bereq.url ~ "^/(activities/|api/v1/statuses/\d+/card$)") ||
+    (bereq.url ~ "(?i)\.(js|css|jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|svg|swf|ttf|pdf|woff|woff2)$"))
+    {
+      unset beresp.http.set-cookie;
+      unset beresp.http.Cache-Control;
+      unset beresp.http.x-request-id;
+      set beresp.http.Cache-Control = "public, max-age=86400";
+      set beresp.do_stream = true;
+    }
+}
+
+# The synthetic response for 301 redirects
+sub vcl_synth {
+    if (resp.status == 750) {
+      set resp.status = 301;
+      set resp.http.Location = req.http.x-redir;
+      return(deliver);
+    }
+}
+
+# Ensure WebSockets through the pipe do not close prematurely
+sub vcl_pipe {
+    if (req.http.upgrade) {
+        set bereq.http.upgrade = req.http.upgrade;
+        set bereq.http.connection = req.http.connection;
+    }
+}