chore: import upstream snapshot with attribution

internal/util/http/http.go

@@ -0,0 +1,72 @@
+package http
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"go-micro.dev/v6/logger"
+	"go-micro.dev/v6/metadata"
+	"go-micro.dev/v6/registry"
+	"go-micro.dev/v6/selector"
+)
+
+// Write sets the status and body on a http ResponseWriter.
+func Write(w http.ResponseWriter, contentType string, status int, body string) {
+	w.Header().Set("Content-Length", fmt.Sprintf("%v", len(body)))
+	w.Header().Set("Content-Type", contentType)
+	w.WriteHeader(status)
+	fmt.Fprintf(w, `%v`, body)
+}
+
+// WriteBadRequestError sets a 400 status code.
+func WriteBadRequestError(w http.ResponseWriter, err error) {
+	rawBody, err := json.Marshal(map[string]string{
+		"error": err.Error(),
+	})
+	if err != nil {
+		WriteInternalServerError(w, err)
+		return
+	}
+	Write(w, "application/json", 400, string(rawBody))
+}
+
+// WriteInternalServerError sets a 500 status code.
+func WriteInternalServerError(w http.ResponseWriter, err error) {
+	rawBody, err := json.Marshal(map[string]string{
+		"error": err.Error(),
+	})
+	if err != nil {
+		logger.Log(logger.ErrorLevel, err)
+		return
+	}
+	Write(w, "application/json", 500, string(rawBody))
+}
+
+func NewRoundTripper(opts ...Option) http.RoundTripper {
+	options := Options{
+		Registry: registry.DefaultRegistry,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return &roundTripper{
+		rt:   http.DefaultTransport,
+		st:   selector.Random,
+		opts: options,
+	}
+}
+
+// RequestToContext puts the `Authorization` header bearer token into context
+// so calls to services will be authorized.
+func RequestToContext(r *http.Request) context.Context {
+	ctx := context.Background()
+	md := make(metadata.Metadata)
+	for k, v := range r.Header {
+		md[k] = strings.Join(v, ",")
+	}
+	return metadata.NewContext(ctx, md)
+}