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// Copyright 2015 The appc 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 types
import (
"encoding/json"
"fmt"
"regexp"
)
var (
envPattern = regexp.MustCompile("^[A-Za-z_][A-Za-z_0-9]*$")
)
type Environment []EnvironmentVariable
type environment Environment
type EnvironmentVariable struct {
Name string `json:"name"`
Value string `json:"value"`
}
func (ev EnvironmentVariable) assertValid() error {
if len(ev.Name) == 0 {
return fmt.Errorf(`environment variable name must not be empty`)
}
if !envPattern.MatchString(ev.Name) {
return fmt.Errorf(`environment variable does not have valid identifier %q`, ev.Name)
}
return nil
}
func (e Environment) assertValid() error {
seen := map[string]bool{}
for _, env := range e {
if err := env.assertValid(); err != nil {
return err
}
_, ok := seen[env.Name]
if ok {
return fmt.Errorf(`duplicate environment variable of name %q`, env.Name)
}
seen[env.Name] = true
}
return nil
}
func (e Environment) MarshalJSON() ([]byte, error) {
if err := e.assertValid(); err != nil {
return nil, err
}
return json.Marshal(environment(e))
}
func (e *Environment) UnmarshalJSON(data []byte) error {
var je environment
if err := json.Unmarshal(data, &je); err != nil {
return err
}
ne := Environment(je)
if err := ne.assertValid(); err != nil {
return err
}
*e = ne
return nil
}
// Retrieve the value of an environment variable by the given name from
// Environment, if it exists.
func (e Environment) Get(name string) (value string, ok bool) {
for _, env := range e {
if env.Name == name {
return env.Value, true
}
}
return "", false
}
// Set sets the value of an environment variable by the given name,
// overwriting if one already exists.
func (e *Environment) Set(name string, value string) {
for i, env := range *e {
if env.Name == name {
(*e)[i] = EnvironmentVariable{
Name: name,
Value: value,
}
return
}
}
env := EnvironmentVariable{
Name: name,
Value: value,
}
*e = append(*e, env)
}
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