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79 lines
2.6 KiB
79 lines
2.6 KiB
// Copyright 2015 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package jsonhttp provides helper functions to write JSON responses to
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// http.ResponseWriter and read JSON bodies from http.Request.
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package jsonhttp
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import (
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"encoding/json"
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"io"
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"net/http"
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"github.com/coreos/clair/database"
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cerrors "github.com/coreos/clair/utils/errors"
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"github.com/coreos/clair/worker"
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)
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// MaxPostSize is the maximum number of bytes that ParseBody reads from an
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// http.Request.Body.
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var MaxPostSize int64 = 1048576
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// Render writes a JSON-encoded object to a http.ResponseWriter, as well as
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// a HTTP status code.
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func Render(w http.ResponseWriter, httpStatus int, v interface{}) {
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w.WriteHeader(httpStatus)
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if v != nil {
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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result, _ := json.Marshal(v)
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w.Write(result)
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}
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}
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// RenderError writes an error, wrapped in the Message field of a JSON-encoded
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// object to a http.ResponseWriter, as well as a HTTP status code.
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// If the status code is 0, RenderError tries to guess the proper HTTP status
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// code from the error type.
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func RenderError(w http.ResponseWriter, httpStatus int, err error) {
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if httpStatus == 0 {
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httpStatus = http.StatusInternalServerError
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// Try to guess the http status code from the error type
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if _, isBadRequestError := err.(*cerrors.ErrBadRequest); isBadRequestError {
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httpStatus = http.StatusBadRequest
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} else {
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switch err {
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case cerrors.ErrNotFound:
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httpStatus = http.StatusNotFound
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case database.ErrTransaction, database.ErrBackendException:
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httpStatus = http.StatusServiceUnavailable
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case worker.ErrParentUnknown, worker.ErrUnsupported:
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httpStatus = http.StatusBadRequest
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}
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}
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}
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Render(w, httpStatus, struct{ Message string }{Message: err.Error()})
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}
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// ParseBody reads a JSON-encoded body from a http.Request and unmarshals it
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// into the provided object.
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func ParseBody(r *http.Request, v interface{}) (int, error) {
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defer r.Body.Close()
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err := json.NewDecoder(io.LimitReader(r.Body, MaxPostSize)).Decode(v)
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if err != nil {
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return http.StatusUnsupportedMediaType, err
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}
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return 0, nil
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}
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