respond: Add http.ServeFile and http.ServeContent wrappers

respond/file.go

@@ -0,0 +1,55 @@
+// Copyright 2020 Google LLC
+//
+// 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 respond
+
+import (
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/Jille/convreq/internal"
+)
+
+type respondFile struct {
+	name string
+}
+
+// Respond implements convreq.HttpResponse.
+func (rf respondFile) Respond(w http.ResponseWriter, r *http.Request) error {
+	http.ServeFile(w, r, rf.name)
+	return nil
+}
+
+// ServeFile uses http.ServeFile() to serve a file.
+func ServeFile(name string) internal.HttpResponse {
+	return respondFile{name}
+}
+
+type respondContent struct {
+	name    string
+	modtime time.Time
+	content io.ReadSeeker
+}
+
+// Respond implements convreq.HttpResponse.
+func (rc respondContent) Respond(w http.ResponseWriter, r *http.Request) error {
+	http.ServeContent(w, r, rc.name, rc.modtime, rc.content)
+	return nil
+}
+
+// ServeContent uses http.ServeContent() to serve content.
+func ServeContent(name string, modtime time.Time, content io.ReadSeeker) internal.HttpResponse {
+	return respondContent{name, modtime, content}
+}