Initial QSfera import

Server/vendor/github.com/libregraph/lico/utils/json.go

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2017-2019 Kopano and its licensors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package utils
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+const (
+	defaultJSONContentType = "application/json; encoding=utf-8"
+)
+
+// WriteJSON marshals the provided data as JSON and writes it to the provided
+// http.ResponseWriter using the provided HTTP status code and content-type. the
+// nature of this function is that it always writes a HTTP response header. Thus
+// it makes no sense to write another header on error. Resulting errors should
+// be logged and the connection should be closes as it is non-functional.
+func WriteJSON(rw http.ResponseWriter, code int, data interface{}, contentType string) error {
+	if contentType == "" {
+		rw.Header().Set("Content-Type", defaultJSONContentType)
+	} else {
+		rw.Header().Set("content-Type", contentType)
+	}
+
+	rw.WriteHeader(code)
+
+	enc := json.NewEncoder(rw)
+	enc.SetIndent("", "  ")
+
+	return enc.Encode(data)
+}