/*
Copyright 2015 The Kubernetes 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 create

import (
	"github.com/spf13/cobra"

	"k8s.io/cli-runtime/pkg/genericclioptions"
	cmdutil "k8s.io/kubectl/pkg/cmd/util"
	"k8s.io/kubectl/pkg/generate"
	generateversioned "k8s.io/kubectl/pkg/generate/versioned"
	"k8s.io/kubectl/pkg/util/i18n"
	"k8s.io/kubectl/pkg/util/templates"
)

// NewCmdCreateSecret groups subcommands to create various types of secrets
func NewCmdCreateSecret(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "secret",
		Short: i18n.T("Create a secret using specified subcommand"),
		Long:  i18n.T("Create a secret using specified subcommand."),
		Run:   cmdutil.DefaultSubCommandRun(ioStreams.ErrOut),
	}
	cmd.AddCommand(NewCmdCreateSecretDockerRegistry(f, ioStreams))
	cmd.AddCommand(NewCmdCreateSecretTLS(f, ioStreams))
	cmd.AddCommand(NewCmdCreateSecretGeneric(f, ioStreams))

	return cmd
}

var (
	secretLong = templates.LongDesc(i18n.T(`
		Create a secret based on a file, directory, or specified literal value.

		A single secret may package one or more key/value pairs.

		When creating a secret based on a file, the key will default to the basename of the file, and the value will
		default to the file content. If the basename is an invalid key or you wish to chose your own, you may specify
		an alternate key.

		When creating a secret based on a directory, each file whose basename is a valid key in the directory will be
		packaged into the secret. Any directory entries except regular files are ignored (e.g. subdirectories,
		symlinks, devices, pipes, etc).`))

	secretExample = templates.Examples(i18n.T(`
	  # Create a new secret named my-secret with keys for each file in folder bar
	  kubectl create secret generic my-secret --from-file=path/to/bar

	  # Create a new secret named my-secret with specified keys instead of names on disk
	  kubectl create secret generic my-secret --from-file=ssh-privatekey=path/to/id_rsa --from-file=ssh-publickey=path/to/id_rsa.pub

	  # Create a new secret named my-secret with key1=supersecret and key2=topsecret
	  kubectl create secret generic my-secret --from-literal=key1=supersecret --from-literal=key2=topsecret

	  # Create a new secret named my-secret using a combination of a file and a literal
	  kubectl create secret generic my-secret --from-file=ssh-privatekey=path/to/id_rsa --from-literal=passphrase=topsecret

	  # Create a new secret named my-secret from an env file
	  kubectl create secret generic my-secret --from-env-file=path/to/bar.env`))
)

// SecretGenericOpts holds the options for 'create secret' sub command
type SecretGenericOpts struct {
	CreateSubcommandOptions *CreateSubcommandOptions
}

// NewCmdCreateSecretGeneric is a command to create generic secrets from files, directories, or literal values
func NewCmdCreateSecretGeneric(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	options := &SecretGenericOpts{
		CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
	}

	cmd := &cobra.Command{
		Use:                   "generic NAME [--type=string] [--from-file=[key=]source] [--from-literal=key1=value1] [--dry-run=server|client|none]",
		DisableFlagsInUseLine: true,
		Short:                 i18n.T("Create a secret from a local file, directory or literal value"),
		Long:                  secretLong,
		Example:               secretExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(options.Complete(f, cmd, args))
			cmdutil.CheckErr(options.Run())
		},
	}

	options.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)

	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddGeneratorFlags(cmd, generateversioned.SecretV1GeneratorName)
	cmd.Flags().StringSlice("from-file", []string{}, "Key files can be specified using their file path, in which case a default name will be given to them, or optionally with a name and file path, in which case the given name will be used.  Specifying a directory will iterate each named file in the directory that is a valid secret key.")
	cmd.Flags().StringArray("from-literal", []string{}, "Specify a key and literal value to insert in secret (i.e. mykey=somevalue)")
	cmd.Flags().String("from-env-file", "", "Specify the path to a file to read lines of key=val pairs to create a secret (i.e. a Docker .env file).")
	cmd.Flags().String("type", "", i18n.T("The type of secret to create"))
	cmd.Flags().Bool("append-hash", false, "Append a hash of the secret to its name.")
	cmdutil.AddFieldManagerFlagVar(cmd, &options.CreateSubcommandOptions.FieldManager, "kubectl-create")
	return cmd
}

// Complete completes all the required options
func (o *SecretGenericOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)
	if err != nil {
		return err
	}

	var generator generate.StructuredGenerator
	switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
	case generateversioned.SecretV1GeneratorName:
		generator = &generateversioned.SecretGeneratorV1{
			Name:           name,
			Type:           cmdutil.GetFlagString(cmd, "type"),
			FileSources:    cmdutil.GetFlagStringSlice(cmd, "from-file"),
			LiteralSources: cmdutil.GetFlagStringArray(cmd, "from-literal"),
			EnvFileSource:  cmdutil.GetFlagString(cmd, "from-env-file"),
			AppendHash:     cmdutil.GetFlagBool(cmd, "append-hash"),
		}
	default:
		return errUnsupportedGenerator(cmd, generatorName)
	}

	return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)
}

// Run calls the CreateSubcommandOptions.Run in SecretGenericOpts instance
func (o *SecretGenericOpts) Run() error {
	return o.CreateSubcommandOptions.Run()
}

var (
	secretForDockerRegistryLong = templates.LongDesc(i18n.T(`
		Create a new secret for use with Docker registries.

		Dockercfg secrets are used to authenticate against Docker registries.

		When using the Docker command line to push images, you can authenticate to a given registry by running:
			'$ docker login DOCKER_REGISTRY_SERVER --username=DOCKER_USER --password=DOCKER_PASSWORD --email=DOCKER_EMAIL'.

	That produces a ~/.dockercfg file that is used by subsequent 'docker push' and 'docker pull' commands to
		authenticate to the registry. The email address is optional.

		When creating applications, you may have a Docker registry that requires authentication.  In order for the
		nodes to pull images on your behalf, they have to have the credentials.  You can provide this information
		by creating a dockercfg secret and attaching it to your service account.`))

	secretForDockerRegistryExample = templates.Examples(i18n.T(`
		  # If you don't already have a .dockercfg file, you can create a dockercfg secret directly by using:
		  kubectl create secret docker-registry my-secret --docker-server=DOCKER_REGISTRY_SERVER --docker-username=DOCKER_USER --docker-password=DOCKER_PASSWORD --docker-email=DOCKER_EMAIL`))
)

// SecretDockerRegistryOpts holds the options for 'create secret docker-registry' sub command
type SecretDockerRegistryOpts struct {
	CreateSubcommandOptions *CreateSubcommandOptions
}

// NewCmdCreateSecretDockerRegistry is a macro command for creating secrets to work with Docker registries
func NewCmdCreateSecretDockerRegistry(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	options := &SecretDockerRegistryOpts{
		CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
	}

	cmd := &cobra.Command{
		Use:                   "docker-registry NAME --docker-username=user --docker-password=password --docker-email=email [--docker-server=string] [--from-literal=key1=value1] [--dry-run=server|client|none]",
		DisableFlagsInUseLine: true,
		Short:                 i18n.T("Create a secret for use with a Docker registry"),
		Long:                  secretForDockerRegistryLong,
		Example:               secretForDockerRegistryExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(options.Complete(f, cmd, args))
			cmdutil.CheckErr(options.Run())
		},
	}

	options.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)

	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddGeneratorFlags(cmd, generateversioned.SecretForDockerRegistryV1GeneratorName)
	cmd.Flags().String("docker-username", "", i18n.T("Username for Docker registry authentication"))
	cmd.Flags().String("docker-password", "", i18n.T("Password for Docker registry authentication"))
	cmd.Flags().String("docker-email", "", i18n.T("Email for Docker registry"))
	cmd.Flags().String("docker-server", "https://index.docker.io/v1/", i18n.T("Server location for Docker registry"))
	cmd.Flags().Bool("append-hash", false, "Append a hash of the secret to its name.")
	cmd.Flags().StringSlice("from-file", []string{}, "Key files can be specified using their file path, in which case a default name will be given to them, or optionally with a name and file path, in which case the given name will be used.  Specifying a directory will iterate each named file in the directory that is a valid secret key.")
	cmdutil.AddFieldManagerFlagVar(cmd, &options.CreateSubcommandOptions.FieldManager, "kubectl-create")

	return cmd
}

// Complete completes all the required options
func (o *SecretDockerRegistryOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)
	if err != nil {
		return err
	}

	fromFileFlag := cmdutil.GetFlagStringSlice(cmd, "from-file")
	if len(fromFileFlag) == 0 {
		requiredFlags := []string{"docker-username", "docker-password", "docker-server"}
		for _, requiredFlag := range requiredFlags {
			if value := cmdutil.GetFlagString(cmd, requiredFlag); len(value) == 0 {
				return cmdutil.UsageErrorf(cmd, "flag %s is required", requiredFlag)
			}
		}
	}

	var generator generate.StructuredGenerator
	switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
	case generateversioned.SecretForDockerRegistryV1GeneratorName:
		generator = &generateversioned.SecretForDockerRegistryGeneratorV1{
			Name:        name,
			Username:    cmdutil.GetFlagString(cmd, "docker-username"),
			Email:       cmdutil.GetFlagString(cmd, "docker-email"),
			Password:    cmdutil.GetFlagString(cmd, "docker-password"),
			Server:      cmdutil.GetFlagString(cmd, "docker-server"),
			AppendHash:  cmdutil.GetFlagBool(cmd, "append-hash"),
			FileSources: cmdutil.GetFlagStringSlice(cmd, "from-file"),
		}
	default:
		return errUnsupportedGenerator(cmd, generatorName)
	}

	return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)
}

// Run calls CreateSubcommandOptions.Run in SecretDockerRegistryOpts instance
func (o *SecretDockerRegistryOpts) Run() error {
	return o.CreateSubcommandOptions.Run()
}

var (
	secretForTLSLong = templates.LongDesc(i18n.T(`
		Create a TLS secret from the given public/private key pair.

		The public/private key pair must exist before hand. The public key certificate must be .PEM encoded and match
		the given private key.`))

	secretForTLSExample = templates.Examples(i18n.T(`
	  # Create a new TLS secret named tls-secret with the given key pair:
	  kubectl create secret tls tls-secret --cert=path/to/tls.cert --key=path/to/tls.key`))
)

// SecretTLSOpts holds the options for 'create secret tls' sub command
type SecretTLSOpts struct {
	CreateSubcommandOptions *CreateSubcommandOptions
}

// NewCmdCreateSecretTLS is a macro command for creating secrets to work with Docker registries
func NewCmdCreateSecretTLS(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	options := &SecretTLSOpts{
		CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
	}

	cmd := &cobra.Command{
		Use:                   "tls NAME --cert=path/to/cert/file --key=path/to/key/file [--dry-run=server|client|none]",
		DisableFlagsInUseLine: true,
		Short:                 i18n.T("Create a TLS secret"),
		Long:                  secretForTLSLong,
		Example:               secretForTLSExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(options.Complete(f, cmd, args))
			cmdutil.CheckErr(options.Run())
		},
	}

	options.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)

	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddGeneratorFlags(cmd, generateversioned.SecretForTLSV1GeneratorName)
	cmd.Flags().String("cert", "", i18n.T("Path to PEM encoded public key certificate."))
	cmd.Flags().String("key", "", i18n.T("Path to private key associated with given certificate."))
	cmd.Flags().Bool("append-hash", false, "Append a hash of the secret to its name.")
	cmdutil.AddFieldManagerFlagVar(cmd, &options.CreateSubcommandOptions.FieldManager, "kubectl-create")
	return cmd
}

// Complete completes all the required options
func (o *SecretTLSOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)
	if err != nil {
		return err
	}

	requiredFlags := []string{"cert", "key"}
	for _, requiredFlag := range requiredFlags {
		if value := cmdutil.GetFlagString(cmd, requiredFlag); len(value) == 0 {
			return cmdutil.UsageErrorf(cmd, "flag %s is required", requiredFlag)
		}
	}
	var generator generate.StructuredGenerator
	switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
	case generateversioned.SecretForTLSV1GeneratorName:
		generator = &generateversioned.SecretForTLSGeneratorV1{
			Name:       name,
			Key:        cmdutil.GetFlagString(cmd, "key"),
			Cert:       cmdutil.GetFlagString(cmd, "cert"),
			AppendHash: cmdutil.GetFlagBool(cmd, "append-hash"),
		}
	default:
		return errUnsupportedGenerator(cmd, generatorName)
	}

	return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)
}

// Run calls CreateSubcommandOptions.Run in the SecretTLSOpts instance
func (o *SecretTLSOpts) Run() error {
	return o.CreateSubcommandOptions.Run()
}
