feat(libhttp): move into the Portainer repository EE-5475 (#10231)

pkg/libhttp/response/response.go

@@ -0,0 +1,45 @@
+// Package response provides convenience functions to write into a http.ResponseWriter.
+package response
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+
+	httperror "github.com/portainer/portainer/pkg/libhttp/error"
+)
+
+// JSON encodes data to rw in JSON format. Returns a pointer to a
+// HandlerError if encoding fails.
+func JSON(rw http.ResponseWriter, data interface{}) *httperror.HandlerError {
+	rw.Header().Set("Content-Type", "application/json")
+
+	err := json.NewEncoder(rw).Encode(data)
+	if err != nil {
+		return httperror.InternalServerError("Unable to write JSON response", err)
+	}
+
+	return nil
+}
+
+// JSON encodes data to rw in YAML format. Returns a pointer to a
+// HandlerError if encoding fails.
+func YAML(rw http.ResponseWriter, data interface{}) *httperror.HandlerError {
+	rw.Header().Set("Content-Type", "text/yaml")
+
+	strData, ok := data.(string)
+	if !ok {
+		return httperror.InternalServerError("Unable to write YAML response", errors.New("failed to convert input to string"))
+	}
+
+	fmt.Fprint(rw, strData)
+
+	return nil
+}
+
+// Empty merely sets the response code to NoContent (204).
+func Empty(rw http.ResponseWriter) *httperror.HandlerError {
+	rw.WriteHeader(http.StatusNoContent)
+	return nil
+}