feat: Add GetInstance endpoint (#9452)

proto/zitadel/instance/v2/instance.proto

@@ -0,0 +1,52 @@
+syntax = "proto3";
+
+import "protoc-gen-openapiv2/options/annotations.proto";
+import "zitadel/object/v2/object.proto";
+
+package zitadel.instance.v2;
+
+option go_package = "github.com/zitadel/zitadel/pkg/grpc/instance/v2;instance";
+
+message Instance {
+  string id = 1 [
+      (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+          example: "\"69629023906488334\""
+      }
+  ];
+  zitadel.object.v2.Details details = 2;
+  State state = 3 [
+      (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+          description: "current state of the instance";
+      }
+  ];
+  string name = 4 [
+      (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+          example: "\"ZITADEL\"";
+      }
+  ];
+  string version = 5 [
+      (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+          example: "\"1.0.0\"";
+      }
+  ];
+  repeated Domain domains = 6;
+}
+
+enum State {
+    STATE_UNSPECIFIED = 0;
+    STATE_CREATING = 1;
+    STATE_RUNNING = 2;
+    STATE_STOPPING = 3;
+    STATE_STOPPED = 4;
+}
+
+message Domain {
+    zitadel.object.v2.Details details = 1;
+    string domain = 2 [
+        (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+            example: "\"zitadel.com\""
+        }
+    ];
+    bool primary = 3;
+    bool generated = 4;
+}

proto/zitadel/instance/v2/instance_service.proto

@@ -4,6 +4,8 @@ package zitadel.instance.v2;
 
 import "validate/validate.proto";
 import "zitadel/object/v2/object.proto";
+import "zitadel/instance/v2/instance.proto";
+import "google/protobuf/empty.proto";
 import "protoc-gen-openapiv2/options/annotations.proto";
 import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
@@ -115,6 +117,10 @@ message DeleteInstanceResponse {
   zitadel.object.v2.Details details = 1;
 }
 
+message GetInstanceResponse {
+  zitadel.instance.v2.Instance instance = 1;
+}
+
 service InstanceService {
 
   // DeleteInstance deletes an instance with the given ID.
@@ -148,10 +154,39 @@ service InstanceService {
       }
     };
   }
+
+  // GetInstance returns the instance for the current context.
+  rpc GetInstance(google.protobuf.Empty) returns (GetInstanceResponse) {
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      description: "Gets the instance associated to the current context";
+      tags: "Instance";
+      responses: {
+        key: "200";
+        value: {
+          description: "The instance of the context.";
+          schema: {
+            json_schema: {
+              ref: "#/definitions/GetInstanceResponse";
+            }
+          };
+        }
+      };
+    };
+
+    option (google.api.http) = {
+      get: "/v2/instances/current"
+    };
+
+    option (zitadel.protoc_gen_zitadel.v2.options) = {
+      auth_option: {
+        permission: "instance.get"
+      }
+    };
+  }
+
 }
 
 // UpdateInstance
-// GetInstance
 // ListInstances
 // DeleteInstance