forked from palantir/conjure-go-runtime
/
plain.go
85 lines (73 loc) · 2.2 KB
/
plain.go
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// Copyright (c) 2019 Palantir Technologies. All rights reserved.
//
// 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 codecs
import (
"encoding"
"io"
"io/ioutil"
"reflect"
werror "github.com/palantir/witchcraft-go-error"
)
const (
contentTypePlain = "text/plain"
)
// Plain implements a text/plain codec. Values used to marshal/unmarshal
// must be of type string or encoding.TextMarshaler/encoding.TextUnmarshaler.
var Plain Codec = codecPlain{}
type codecPlain struct{}
func (codecPlain) Accept() string {
return contentTypePlain
}
func (codecPlain) Decode(r io.Reader, v interface{}) error {
text, err := ioutil.ReadAll(r)
if err != nil {
return err
}
return Plain.Unmarshal(text, v)
}
func (codecPlain) Unmarshal(data []byte, v interface{}) error {
switch t := v.(type) {
case *string:
*t = string(data)
return nil
case encoding.TextUnmarshaler:
return t.UnmarshalText(data)
}
return werror.Error("unmarshal target must be a string or encoding.TextUnmarshaler", werror.SafeParam("type", reflect.TypeOf(v).String()))
}
func (codecPlain) ContentType() string {
return contentTypePlain
}
func (codecPlain) Encode(w io.Writer, v interface{}) error {
data, err := Plain.Marshal(v)
if err != nil {
return err
}
_, err = w.Write(data)
return err
}
func (codecPlain) Marshal(v interface{}) ([]byte, error) {
switch t := v.(type) {
case string:
return []byte(t), nil
case encoding.TextMarshaler:
return t.MarshalText()
default:
val := reflect.ValueOf(v)
if val.Kind() == reflect.Ptr {
return Plain.Marshal(val.Elem().Interface())
}
}
return nil, werror.Error("marshal target must be a string or encoding.TextMarshaler", werror.SafeParam("type", reflect.TypeOf(v).String()))
}