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// Copyright 2015 go-swagger maintainers
//
// 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 runtime
import (
"bytes"
"encoding"
"errors"
"fmt"
"io"
"reflect"
"github.com/go-openapi/swag"
)
// TextConsumer creates a new text consumer
func TextConsumer() Consumer {
return ConsumerFunc(func(reader io.Reader, data interface{}) error {
if reader == nil {
return errors.New("TextConsumer requires a reader") // early exit
}
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(reader)
if err != nil {
return err
}
b := buf.Bytes()
// If the buffer is empty, no need to unmarshal it, which causes a panic.
if len(b) == 0 {
return nil
}
if tu, ok := data.(encoding.TextUnmarshaler); ok {
err := tu.UnmarshalText(b)
if err != nil {
return fmt.Errorf("text consumer: %v", err)
}
return nil
}
t := reflect.TypeOf(data)
if data != nil && t.Kind() == reflect.Ptr {
v := reflect.Indirect(reflect.ValueOf(data))
if t.Elem().Kind() == reflect.String {
v.SetString(string(b))
return nil
}
}
return fmt.Errorf("%v (%T) is not supported by the TextConsumer, %s",
data, data, "can be resolved by supporting TextUnmarshaler interface")
})
}
// TextProducer creates a new text producer
func TextProducer() Producer {
return ProducerFunc(func(writer io.Writer, data interface{}) error {
if writer == nil {
return errors.New("TextProducer requires a writer") // early exit
}
if data == nil {
return errors.New("no data given to produce text from")
}
if tm, ok := data.(encoding.TextMarshaler); ok {
txt, err := tm.MarshalText()
if err != nil {
return fmt.Errorf("text producer: %v", err)
}
_, err = writer.Write(txt)
return err
}
if str, ok := data.(error); ok {
_, err := writer.Write([]byte(str.Error()))
return err
}
if str, ok := data.(fmt.Stringer); ok {
_, err := writer.Write([]byte(str.String()))
return err
}
v := reflect.Indirect(reflect.ValueOf(data))
if t := v.Type(); t.Kind() == reflect.Struct || t.Kind() == reflect.Slice {
b, err := swag.WriteJSON(data)
if err != nil {
return err
}
_, err = writer.Write(b)
return err
}
if v.Kind() != reflect.String {
return fmt.Errorf("%T is not a supported type by the TextProducer", data)
}
_, err := writer.Write([]byte(v.String()))
return err
})
}