Initial QSfera import

Server/vendor/github.com/opensearch-project/opensearch-go/v4/request_builder.go

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// The OpenSearch Contributors require contributions made to
+// this file be licensed under the Apache-2.0 license or a
+// compatible open source license.
+//
+// Modifications Copyright OpenSearch Contributors. See
+// GitHub history for details.
+
+// 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 opensearch
+
+import (
+	"io"
+	"net/http"
+)
+
+const (
+	headerContentType = "Content-Type"
+)
+
+// BuildRequest is a helper function to build a http.Request
+func BuildRequest(method string, path string, body io.Reader, params map[string]string, headers http.Header) (*http.Request, error) {
+	//nolint:noctx // ctx gets appended when the requests gets executet
+	httpReq, err := http.NewRequest(method, path, body)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(params) > 0 {
+		q := httpReq.URL.Query()
+		for k, v := range params {
+			q.Set(k, v)
+		}
+
+		httpReq.URL.RawQuery = q.Encode()
+	}
+
+	if body != nil {
+		httpReq.Header[headerContentType] = []string{"application/json"}
+	}
+
+	if len(headers) > 0 {
+		if len(httpReq.Header) == 0 {
+			httpReq.Header = headers
+		} else {
+			for k, vv := range headers {
+				for _, v := range vv {
+					httpReq.Header.Add(k, v)
+				}
+			}
+		}
+	}
+	return httpReq, nil
+}