Initialize module and dependencies

vendor/github.com/sashabaranov/go-openai/internal/request_builder.go

@@ -0,0 +1,52 @@
+package openai
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"net/http"
+)
+
+type RequestBuilder interface {
+	Build(ctx context.Context, method, url string, body any, header http.Header) (*http.Request, error)
+}
+
+type HTTPRequestBuilder struct {
+	marshaller Marshaller
+}
+
+func NewRequestBuilder() *HTTPRequestBuilder {
+	return &HTTPRequestBuilder{
+		marshaller: &JSONMarshaller{},
+	}
+}
+
+func (b *HTTPRequestBuilder) Build(
+	ctx context.Context,
+	method string,
+	url string,
+	body any,
+	header http.Header,
+) (req *http.Request, err error) {
+	var bodyReader io.Reader
+	if body != nil {
+		if v, ok := body.(io.Reader); ok {
+			bodyReader = v
+		} else {
+			var reqBytes []byte
+			reqBytes, err = b.marshaller.Marshal(body)
+			if err != nil {
+				return
+			}
+			bodyReader = bytes.NewBuffer(reqBytes)
+		}
+	}
+	req, err = http.NewRequestWithContext(ctx, method, url, bodyReader)
+	if err != nil {
+		return
+	}
+	if header != nil {
+		req.Header = header
+	}
+	return
+}