forked from istio/istio
/
utils.go
54 lines (46 loc) · 1.63 KB
/
utils.go
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// Copyright 2018 Istio Authors
//
// 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 fw
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"net/http"
)
// RenderError outputs an error message
func RenderError(w http.ResponseWriter, statusCode int, err error) {
w.WriteHeader(statusCode)
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
_, _ = fmt.Fprintf(w, "%v", err)
}
// RenderHTML executes the given template, sending the output to the supplied response writer
func RenderHTML(w http.ResponseWriter, t *template.Template, data interface{}) {
b := &bytes.Buffer{}
if err := t.Execute(b, data); err != nil {
RenderError(w, http.StatusInternalServerError, err)
return
}
w.WriteHeader(http.StatusOK)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
_, _ = b.WriteTo(w)
}
// RenderJSON outputs the given data as JSON
func RenderJSON(w http.ResponseWriter, statusCode int, data interface{}) {
w.WriteHeader(statusCode)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if err := json.NewEncoder(w).Encode(data); err != nil {
RenderError(w, http.StatusInternalServerError, err)
}
}