post.go

// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 cmd

import (
	"context"
	"encoding/base64"
	"fmt"
	"log"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"google.golang.org/grpc"

	tpb "github.com/google/keytransparency/core/api/type/type_go_proto"
	"github.com/google/tink/go/tink"
)

var (
	data string
)

// postCmd represents the post command
var postCmd = &cobra.Command{
	Use:   "post [user email] -d {base64 key data}",
	Short: "Update the account with the given profile",
	Long: `Post replaces the current key-set with the provided key-set,
and verifies that both the previous and current key-sets are accurate. eg:

./keytransparency-client post foobar@example.com -d "dGVzdA=="

User email MUST match the OAuth account used to authorize the update.
`,

	PreRun: func(cmd *cobra.Command, args []string) {
		handle, err := readKeysetFile(keysetFile, masterPassword)
		if err != nil {
			log.Fatal(err)
		}
		keyset = handle
	},
	RunE: func(cmd *cobra.Command, args []string) error {
		// Validate input.
		if len(args) < 1 {
			return fmt.Errorf("user email needs to be provided")
		}
		if data == "" {
			return fmt.Errorf("no key data provided")
		}
		if !viper.IsSet("client-secret") {
			return fmt.Errorf("no client secret provided")
		}
		profileData, err := base64.StdEncoding.DecodeString(data)
		if err != nil {
			return fmt.Errorf("hex.Decode(%v): %v", data, err)
		}
		userID := args[0]
		timeout := viper.GetDuration("timeout")
		ctx, cancel := context.WithTimeout(context.Background(), timeout)
		defer cancel()

		// Create client.
		userCreds, err := userCreds(ctx)
		if err != nil {
			return err
		}
		c, err := GetClient(ctx)
		if err != nil {
			return fmt.Errorf("error connecting: %v", err)
		}

		// Update.
		authorizedKeys, err := keyset.Public()
		if err != nil {
			return fmt.Errorf("store.PublicKeys() failed: %v", err)
		}
		if err != nil {
			return fmt.Errorf("updateKeys() failed: %v", err)
		}
		u := &tpb.User{
			DirectoryId:    viper.GetString("directory"),
			UserId:         userID,
			PublicKeyData:  profileData,
			AuthorizedKeys: authorizedKeys.Keyset(),
		}
		if _, err := c.Update(ctx, u, []*tink.KeysetHandle{keyset},
			grpc.PerRPCCredentials(userCreds)); err != nil {
			return fmt.Errorf("update failed: %v", err)
		}
		fmt.Printf("New key for %v: %x\n", userID, data)
		return nil
	},
}

func init() {
	RootCmd.AddCommand(postCmd)

	postCmd.PersistentFlags().StringVarP(&masterPassword, "password", "p", "", "The master key to the local keyset")
	postCmd.PersistentFlags().StringP("secret", "s", "", "Path to client secret json")
	if err := viper.BindPFlag("client-secret", postCmd.PersistentFlags().Lookup("secret")); err != nil {
		log.Fatalf("%v", err)
	}

	postCmd.PersistentFlags().StringVarP(&data, "data", "d", "", "hex encoded key data")
}