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Copy pathbytes.go
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bytes.go
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// Copyright 2018 Philipp Brüll <[email protected]>
//
// 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 env
import (
"encoding/hex"
"os"
)
// BytesField implements a string field.
type BytesField struct {
*field
defaultValue []byte
}
// Bytes registers a field of the provided name.
func Bytes(name string, defaultValue []byte, opts ...Option) *BytesField {
field := &BytesField{
field: newField("Bytes", name, opts),
defaultValue: defaultValue,
}
RegisterField(field)
return field
}
// Value returns the field's value.
func (bf *BytesField) Value() string {
return hex.EncodeToString(bf.Get())
}
// DefaultValue returns the field's default value.
func (bf *BytesField) DefaultValue() string {
return hex.EncodeToString(bf.defaultValue)
}
// Description returns the field's description.
func (bf *BytesField) Description() string {
return bf.description(bf.DefaultValue())
}
// Get returns the field value or the default value.
func (bf *BytesField) Get() []byte {
text := os.Getenv(bf.Name())
if text == "" {
if bf.options.required {
requiredError(bf)
}
return bf.defaultValue
}
if !bf.options.isAllowedValue(text) {
unallowedError(bf, text, bf.options.allowedValues)
return bf.defaultValue
}
value, err := hex.DecodeString(text)
if err != nil {
parseError(bf, "bytes", text)
return bf.defaultValue
}
return value
}