refactor: helper method for register swagger api (#12955)

* refactor: helper method for register swagger api

* updates swagger.yaml

* `make update-swagger-docs`

server/api/server.go

@@ -20,9 +20,6 @@ import (
 	"github.com/cosmos/cosmos-sdk/server/config"
 	"github.com/cosmos/cosmos-sdk/telemetry"
 	grpctypes "github.com/cosmos/cosmos-sdk/types/grpc"
-
-	// unnamed import of statik for swagger UI support
-	_ "github.com/cosmos/cosmos-sdk/client/docs/statik"
 )
 
 // Server defines the server's API interface.

server/swagger.go

@@ -0,0 +1,29 @@
+package server
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/gorilla/mux"
+	"github.com/rakyll/statik/fs"
+
+	_ "github.com/cosmos/cosmos-sdk/client/docs/statik"
+)
+
+// RegisterSwaggerAPI provides a common function which registers swagger route with API Server
+func RegisterSwaggerAPI(_ client.Context, rtr *mux.Router, swaggerEnabled bool) error {
+	if !swaggerEnabled {
+		return nil
+	}
+
+	statikFS, err := fs.New()
+	if err != nil {
+		return fmt.Errorf("failed to create filesystem: %w", err)
+	}
+
+	staticServer := http.FileServer(statikFS)
+	rtr.PathPrefix("/swagger/").Handler(http.StripPrefix("/swagger/", staticServer))
+
+	return nil
+}