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envvars.go
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envvars.go
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// Copyright 2019 Google LLC
//
// 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
//
// https://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 cloudrunci
import (
"fmt"
"regexp"
"sort"
"strings"
)
// EnvVars is a collection of environment variables.
type EnvVars map[string]string
func (e EnvVars) String() string {
s := make([]string, len(e))
i := 0
for k := range e {
s[i] = e.Variable(k)
i++
}
sort.Strings(s)
return strings.Join(s, ",")
}
// Variable retrieves an environment variable assignment as a string.
func (e EnvVars) Variable(k string) string {
return fmt.Sprintf("%s=%s", strings.TrimSpace(k), strings.TrimSpace(e[k]))
}
// KeyString converts the environment variables names to a comma-delimited list.
func (e EnvVars) KeyString() string {
s := make([]string, len(e))
i := 0
for k := range e {
s[i] = k
i++
}
sort.Strings(s)
return strings.Join(s, ",")
}
// keyRegex defines valid environment variable name.
// Regex arranged so the first submatch will have the name without whitespace.
// https://stackoverflow.com/questions/2821043/allowed-characters-in-linux-environment-variable-names
var keyRegex = regexp.MustCompile(`^\s*([a-zA-Z_]+\w*)\s*$`)
// Validate confirms all environment variables are valid.
func (e EnvVars) Validate() error {
broken := EnvVars{}
for k := range e {
match := keyRegex.FindStringSubmatch(k)
if len(match) == 0 {
broken[k] = ""
}
}
if len(broken) > 0 {
return fmt.Errorf("invalid environment variable names: %s", broken.KeyString())
}
return nil
}