diff --git a/machines/web01/linkal/default.nix b/machines/web01/linkal/default.nix
index e67fb89..dbd9364 100644
--- a/machines/web01/linkal/default.nix
+++ b/machines/web01/linkal/default.nix
@@ -1,6 +1,26 @@
-_:
-
+{ lib, pkgs, sources, metisProviders, ...}:
 let
+  metisConf = pkgs.runCommandLocal "linkal-metis.json" {} ''
+    # jq dark magic
+    cat << EOF > script.jq
+    .sources |
+    ${lib.concatStringsSep " |\n"
+        (lib.mapAttrsToList (name: value:
+          ".\"${name}\" |= (
+                            to_entries |
+                            map({(\"https://${value}/remote.php/dav/public-calendars/\" + .key): .value}) |
+                            add
+          )"
+        ) metisProviders)
+    } |
+    to_entries |
+    map(.value) |
+    add |
+    { calendars: . }
+    EOF
+
+    ${pkgs.jq}/bin/jq -f script.jq > $out < ${sources.metis}/data/calendars.json
+    '';
   host = "cal.dgnum.eu";
 
   calendarGroups = {
@@ -19,6 +39,10 @@ let
         };
       };
     };
+    ens = {
+      port = 8445;
+      config = metisConf;
+    };
   };
 in {
   imports = [ ./module.nix ];
diff --git a/machines/web01/linkal/module.nix b/machines/web01/linkal/module.nix
index 63da24a..e35e6ee 100644
--- a/machines/web01/linkal/module.nix
+++ b/machines/web01/linkal/module.nix
@@ -1,7 +1,7 @@
 { config, lib, pkgs, sources, ... }:
 
 let
-  inherit (lib) mapAttrs' mkEnableOption mkIf mkOption nameValuePair types;
+  inherit (lib) mapAttrs mapAttrs' mkEnableOption mkIf mkOption nameValuePair types;
 
   package = import sources.linkal { inherit pkgs; };
 
@@ -20,20 +20,26 @@ in {
     domain = mkOption { type = types.str; };
 
     calendarGroups = mkOption {
-      type = let inherit (types) attrsOf port submodule;
-      in attrsOf (submodule {
+      type = let inherit (types) attrsOf port submodule path;
+      in attrsOf (submodule ({ config, ... }: {
         options = {
           port = mkOption { type = port; };
           calendars = mkOption { inherit (jsonFormat) type; };
+          config = mkOption {
+            type = path;
+            default = jsonFormat.generate "linkal-config.json" { inherit (config) calendars; };
+            internal = true;
+          };
         };
-      });
+      }));
       default = { };
     };
   };
 
   config = mkIf cfg.enable {
+
     systemd.services = mapAttrs' (name:
-      { port, calendars }:
+      { port, config, ... }:
       nameValuePair "linkal-${name}" {
         description = "Linkal - ${name}";
         wantedBy = [ "multi-user.target" ];
@@ -42,7 +48,7 @@ in {
           ExecStart = "${cfg.package}/bin/linkal --port ${
               builtins.toString port
             } --calendar-file ${
-              jsonFormat.generate "linkal-${name}.json" { inherit calendars; }
+              config
             }";
         };
       }) cfg.calendarGroups;
diff --git a/machines/web01/metis/default.nix b/machines/web01/metis/default.nix
index 5ccdd77..dbe523c 100644
--- a/machines/web01/metis/default.nix
+++ b/machines/web01/metis/default.nix
@@ -1,30 +1,23 @@
-{ lib, pkgs, sources, ... }:
+{ lib, pkgs, sources, metisProviders, ... }:
 
 let
   package = (import sources.metis { inherit pkgs; }).production;
 
-  providers = {
-    klub-reseau = "nuage.beta.rz.ens.wtf";
-    eleves-ens = "cloud.eleves.ens.fr";
-    frama-agenda = "framagenda.org";
-  };
 
   nginxConf = {
     enableACME = true;
     forceSSL = true;
     root = package;
 
-    locations = lib.mapAttrs' (name: attrs:
+    locations = lib.mapAttrs' (name: value:
       lib.nameValuePair "/cal/${name}/" {
         extraConfig = ''
           proxy_set_header X-Forwarded-Host $host;
           proxy_set_header X-Forwarded-Server $host;
           proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-          proxy_pass https://${
-            providers.${name}
-          }/remote.php/dav/public-calendars/;
+          proxy_pass https://${value}/remote.php/dav/public-calendars/;
         '';
-      }) providers;
+      }) metisProviders;
 
     extraConfig = ''
       rewrite ^/calendrier(.*)$ $1 permanent;
@@ -32,6 +25,11 @@ let
   };
 
 in {
+  _module.args.metisProviders = {
+    klub-reseau = "nuage.beta.rz.ens.wtf";
+    eleves-ens = "cloud.eleves.ens.fr";
+    frama-agenda = "framagenda.org";
+  };
   services.nginx.virtualHosts = {
     "calendrier.eleves.ens.fr" = nginxConf;
     "calendrier.dgnum.eu" = nginxConf;