modules: services: matrix: remove sliding sync

The functionality has been folded into `synapse` itself, and the module
has been removed from the unstable branch.

This reverts commit b4c2cc581b.

hosts/nixos/porthos/services.nix

@@ -69,9 +69,6 @@ in
       mailConfigFile = secrets."matrix/mail".path;
       # Only necessary when doing the initial registration
       secretFile = secrets."matrix/secret".path;
-      slidingSync = {
-        secretFile = secrets."matrix/sliding-sync-secret".path;
-      };
     };
     mealie = {
       enable = true;

modules/nixos/services/matrix/default.nix

@@ -26,21 +26,6 @@ in
       description = "Shared secret to register users";
     };
 
-    slidingSync = {
-      port = mkOption {
-        type = types.port;
-        default = 8009;
-        example = 8084;
-        description = "Port used by sliding sync server";
-      };
-
-      secretFile = mkOption {
-        type = types.str;
-        example = "/var/lib/matrix/sliding-sync-secret-file.env";
-        description = "Secret file which contains SYNCV3_SECRET definition";
-      };
-    };
-
     mailConfigFile = mkOption {
       type = types.str;
       example = "/var/lib/matrix/email-config.yaml";
@@ -130,9 +115,6 @@ in
               "m.identity_server" = {
                 "base_url" = "https://vector.im";
               };
-              "org.matrix.msc3575.proxy" = {
-                "url" = "https://matrix-sync.${domain}";
-              };
             };
             showLabsSettings = true;
             defaultCountryCode = "FR"; # cocorico
@@ -152,10 +134,6 @@ in
       matrix-client = {
         port = clientPort.private;
       };
-      # Sliding sync
-      matrix-sync = {
-        inherit (cfg.slidingSync) port;
-      };
     };
 
     # Those are too complicated to use my wrapper...
@@ -178,11 +156,6 @@ in
 
             "/_matrix" = proxyToClientPort;
             "/_synapse/client" = proxyToClientPort;
-
-            # Sliding sync
-            "~ ^/(client/|_matrix/client/unstable/org.matrix.msc3575/sync)" = {
-              proxyPass = "http://${config.services.matrix-sliding-sync.settings.SYNCV3_BINDADDR}";
-            };
           };
 
         listen = [
@@ -228,7 +201,6 @@ in
             client = {
               "m.homeserver" = { "base_url" = "https://${matrixDomain}"; };
               "m.identity_server" = { "base_url" = "https://vector.im"; };
-              "org.matrix.msc3575.proxy" = { "url" = "https://matrix-sync.${domain}"; };
             };
             # ACAO required to allow element-web on any URL to request this json file
           in