feat: add config flag to hash-password tool (#2047)

This change implements a --config flag for the hash-password which parses the config and validates it just as it would at run-time. The values specified in the config replace those specified as parameters.

* feat(cmd): add config flag to hash-password tool
* fix(cmd): fix linting issue

Closes: #1709.

docs/configuration/authentication/file.md

@@ -69,7 +69,7 @@ resetting their passwords.
 ### path
 <div markdown="1">
 type: string (path)
-{: .label .label-config .label-purple } 
+{: .label .label-config .label-purple }
 required: yes
 {: .label .label-config .label-red }
 </div>
@@ -80,7 +80,7 @@ required: yes
 #### algorithm
 <div markdown="1">
 type: string
-{: .label .label-config .label-purple } 
+{: .label .label-config .label-purple }
 default: argon2id
 {: .label .label-config .label-blue }
 required: no
@@ -108,7 +108,7 @@ When using `sha512` the minimum is 1000, and 50000 is the recommended value.
 #### salt_length
 <div markdown="1">
 type: integer
-{: .label .label-config .label-purple } 
+{: .label .label-config .label-purple }
 default: 16
 {: .label .label-config .label-blue }
 required: no
@@ -122,7 +122,7 @@ and there is no documented reason why you'd set it to anything other than this,
 #### parallelism
 <div markdown="1">
 type: integer
-{: .label .label-config .label-purple } 
+{: .label .label-config .label-purple }
 default: 8
 {: .label .label-config .label-blue }
 required: no
@@ -158,6 +158,8 @@ For instance to generate a hash with the docker image just run:
     $ docker run authelia/authelia:latest authelia hash-password 'yourpassword'
     Password hash: $argon2id$v=19$m=65536$3oc26byQuSkQqksq$zM1QiTvVPrMfV6BVLs2t4gM+af5IN7euO0VB6+Q8ZFs
 
+You may also use the `--config` flag to point to your existing configuration. When used, the values defined in the config will be used instead.
+
 Full CLI Help Documentation:
 
 ```

internal/commands/hash.go

@@ -7,6 +7,7 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/authelia/authelia/v4/internal/authentication"
+	"github.com/authelia/authelia/v4/internal/configuration"
 	"github.com/authelia/authelia/v4/internal/configuration/schema"
 	"github.com/authelia/authelia/v4/internal/logging"
 )
@@ -27,11 +28,14 @@ func NewHashPasswordCmd() (cmd *cobra.Command) {
 	cmd.Flags().IntP("parallelism", "p", schema.DefaultPasswordConfiguration.Parallelism, "[argon2id] set the parallelism param")
 	cmd.Flags().IntP("key-length", "k", schema.DefaultPasswordConfiguration.KeyLength, "[argon2id] set the key length param")
 	cmd.Flags().IntP("salt-length", "l", schema.DefaultPasswordConfiguration.SaltLength, "set the auto-generated salt length")
+	cmd.Flags().StringSliceP("config", "c", []string{}, "Configuration files")
 
 	return cmd
 }
 
 func cmdHashPasswordRun(cmd *cobra.Command, args []string) {
+	logger := logging.Logger()
+
 	sha512, _ := cmd.Flags().GetBool("sha512")
 	iterations, _ := cmd.Flags().GetInt("iterations")
 	salt, _ := cmd.Flags().GetString("salt")
@@ -39,6 +43,25 @@ func cmdHashPasswordRun(cmd *cobra.Command, args []string) {
 	saltLength, _ := cmd.Flags().GetInt("salt-length")
 	memory, _ := cmd.Flags().GetInt("memory")
 	parallelism, _ := cmd.Flags().GetInt("parallelism")
+	configs, _ := cmd.Flags().GetStringSlice("config")
+
+	if len(configs) > 0 {
+		val := schema.NewStructValidator()
+
+		_, config, err := configuration.Load(val, configuration.NewDefaultSources(configs, configuration.DefaultEnvPrefix, configuration.DefaultEnvDelimiter)...)
+		if err != nil {
+			logger.Fatalf("Error occurred loading configuration: %v", err)
+		}
+
+		if config.AuthenticationBackend.File != nil && config.AuthenticationBackend.File.Password != nil {
+			sha512 = config.AuthenticationBackend.File.Password.Algorithm == "sha512"
+			iterations = config.AuthenticationBackend.File.Password.Iterations
+			keyLength = config.AuthenticationBackend.File.Password.KeyLength
+			saltLength = config.AuthenticationBackend.File.Password.SaltLength
+			memory = config.AuthenticationBackend.File.Password.Memory
+			parallelism = config.AuthenticationBackend.File.Password.Parallelism
+		}
+	}
 
 	var (
 		hash      string