124 lines
3.0 KiB
Go
124 lines
3.0 KiB
Go
package command
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import (
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"fmt"
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"io/ioutil"
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"os"
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"github.com/hashicorp/go-multierror"
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"github.com/hashicorp/hcl"
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"github.com/hashicorp/hcl/hcl/ast"
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"github.com/mitchellh/go-homedir"
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)
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const (
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// DefaultConfigPath is the default path to the configuration file
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DefaultConfigPath = "~/.vault"
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// ConfigPathEnv is the environment variable that can be used to
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// override where the Vault configuration is.
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ConfigPathEnv = "VAULT_CONFIG_PATH"
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)
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// Config is the CLI configuration for Vault that can be specified via
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// a `$HOME/.vault` file which is HCL-formatted (therefore HCL or JSON).
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type DefaultConfig struct {
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// TokenHelper is the executable/command that is executed for storing
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// and retrieving the authentication token for the Vault CLI. If this
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// is not specified, then vault's internal token store will be used, which
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// stores the token on disk unencrypted.
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TokenHelper string `hcl:"token_helper"`
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}
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// Config loads the configuration and returns it. If the configuration
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// is already loaded, it is returned.
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func Config() (*DefaultConfig, error) {
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var err error
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config, err := LoadConfig("")
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if err != nil {
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return nil, err
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}
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return config, nil
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}
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// LoadConfig reads the configuration from the given path. If path is
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// empty, then the default path will be used, or the environment variable
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// if set.
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func LoadConfig(path string) (*DefaultConfig, error) {
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if path == "" {
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path = DefaultConfigPath
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}
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if v := os.Getenv(ConfigPathEnv); v != "" {
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path = v
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}
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// NOTE: requires HOME env var to be set
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path, err := homedir.Expand(path)
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if err != nil {
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return nil, fmt.Errorf("Error expanding config path %s: %s", path, err)
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}
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contents, err := ioutil.ReadFile(path)
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if err != nil && !os.IsNotExist(err) {
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return nil, err
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}
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return ParseConfig(string(contents))
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}
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// ParseConfig parses the given configuration as a string.
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func ParseConfig(contents string) (*DefaultConfig, error) {
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root, err := hcl.Parse(contents)
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if err != nil {
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return nil, err
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}
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// Top-level item should be the object list
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list, ok := root.Node.(*ast.ObjectList)
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if !ok {
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return nil, fmt.Errorf("Failed to parse config: does not contain a root object")
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}
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valid := []string{
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"token_helper",
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}
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if err := checkHCLKeys(list, valid); err != nil {
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return nil, err
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}
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var c DefaultConfig
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if err := hcl.DecodeObject(&c, list); err != nil {
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return nil, err
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}
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return &c, nil
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}
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func checkHCLKeys(node ast.Node, valid []string) error {
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var list *ast.ObjectList
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switch n := node.(type) {
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case *ast.ObjectList:
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list = n
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case *ast.ObjectType:
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list = n.List
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default:
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return fmt.Errorf("cannot check HCL keys of type %T", n)
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}
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validMap := make(map[string]struct{}, len(valid))
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for _, v := range valid {
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validMap[v] = struct{}{}
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}
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var result error
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for _, item := range list.Items {
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key := item.Keys[0].Token.Value().(string)
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if _, ok := validMap[key]; !ok {
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result = multierror.Append(result, fmt.Errorf(
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"invalid key '%s' on line %d", key, item.Assign.Line))
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}
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}
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return result
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}
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