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login.go
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login.go
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package cmd
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/capeprivacy/cli/sdk"
"github.com/avast/retry-go"
"github.com/lestrrat-go/jwx/v2/jwt"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
type DeviceCodeResponse struct {
VerificationURIComplete string `json:"verification_uri_complete"`
UserCode string `json:"user_code"`
DeviceCode string `json:"device_code"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
}
type TokenResponse struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
IDToken string `json:"id_token"`
TokenType string `json:"token_type"`
ExpiresIn int `json:"expires_in"`
}
var loginCmd = &cobra.Command{
Use: "login",
Short: "Authenticate to Cape",
Long: `Authenticate to Cape.
Authentication is a web-based browser flow. After completion,
an authentication token will be stored internally.
`,
RunE: login,
}
func init() {
rootCmd.AddCommand(loginCmd)
loginCmd.PersistentFlags().String("link-aws-account", "", "aws account to link with github account in Cape")
}
func login(cmd *cobra.Command, args []string) error {
deviceCodeResponse, err := newDeviceCode()
if err != nil {
return err
}
var tokenResponse *TokenResponse
err = retry.Do(
func() error {
response, err := getToken(deviceCodeResponse.DeviceCode)
tokenResponse = response
return err
},
retry.Attempts(uint(deviceCodeResponse.ExpiresIn/deviceCodeResponse.Interval)),
retry.DelayType(retry.FixedDelay),
retry.Delay(time.Duration(deviceCodeResponse.Interval)*time.Second),
)
if err != nil {
return err
}
err = persistTokenResponse(tokenResponse)
if err != nil {
return err
}
keyReq, err := GetKeyRequest([]string{})
if err != nil {
return err
}
_, err = sdk.Key(keyReq)
if err != nil {
fmt.Println("Unable to fetch cape key, try running 'cape key' after login")
}
authToken, err := getAuthToken()
if err != nil {
return err
}
customerID, _ := cmd.Flags().GetString("link-aws-account")
if customerID != "" {
err = sdk.LinkAWSAccount(C.EnclaveHost, authToken, customerID)
if err != nil {
return err
}
}
fmt.Println("Congratulations, you're all set!")
return nil
}
func newDeviceCode() (*DeviceCodeResponse, error) {
deviceCodeURL := fmt.Sprintf("%s/oauth/device/code", C.AuthHost)
payloadStr := fmt.Sprintf("client_id=%s&scope=openid%%20profile%%20email%%20offline_access&audience=%s", C.ClientID, C.Audience)
req, err := http.NewRequest("POST", deviceCodeURL, strings.NewReader(payloadStr))
if err != nil {
return nil, err
}
req.Header.Add("content-type", "application/x-www-form-urlencoded")
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
body, err := io.ReadAll(res.Body)
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
log.Errorf("unable to login to cape, error: %s", res.Status)
}
response := DeviceCodeResponse{}
err = json.Unmarshal(body, &response)
if err != nil {
return nil, err
}
if len(response.VerificationURIComplete) == 0 {
return nil, errors.New("unknown response detected")
}
fmt.Printf("Your CLI confirmation code is: %s\n", response.UserCode)
fmt.Printf("Visit this URL to complete the login process: %s\n", response.VerificationURIComplete)
// Since we're printing the URL, we can safely ignore any error attempting to open the browser
_ = openbrowser(response.VerificationURIComplete)
return &response, nil
}
func getToken(deviceCode string) (*TokenResponse, error) {
tokenURL := fmt.Sprintf("%s/oauth/token", C.AuthHost)
payload := strings.NewReader(fmt.Sprintf("grant_type=urn%%3Aietf%%3Aparams%%3Aoauth%%3Agrant-type%%3Adevice_code&device_code=%s&client_id=%s", deviceCode, C.ClientID))
req, _ := http.NewRequest("POST", tokenURL, payload)
req.Header.Add("content-type", "application/x-www-form-urlencoded")
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
body, err := io.ReadAll(res.Body)
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
return nil, errors.New("authorization pending")
}
response := TokenResponse{}
err = json.Unmarshal(body, &response)
if err != nil {
return nil, err
}
return &response, nil
}
func persistTokenResponse(response *TokenResponse) error {
authJSON, err := json.MarshalIndent(response, "", " ")
if err != nil {
return err
}
err = sdk.PersistFile(C.LocalConfigDir, C.LocalAuthFileName, authJSON)
if err != nil {
return err
}
return nil
}
func getTokenResponse() (*TokenResponse, error) {
authFile, err := os.Open(filepath.Join(C.LocalConfigDir, C.LocalAuthFileName))
if err != nil {
return nil, err
}
defer authFile.Close()
byteValue, err := io.ReadAll(authFile)
if err != nil {
return nil, err
}
var response TokenResponse
err = json.Unmarshal(byteValue, &response)
if err != nil {
return nil, err
}
return &response, nil
}
func defaultGetAccessTokenVerifyAndParse() (jwt.Token, error) {
tokenResponse, err := getTokenResponse()
if err != nil {
return nil, err
}
set, err := jwk.Fetch(context.Background(), fmt.Sprintf("%s/.well-known/jwks.json", C.AuthHost))
if err != nil {
return nil, fmt.Errorf("failed to parse JWKS %w", err)
}
return jwt.Parse([]byte(tokenResponse.AccessToken), jwt.WithKeySet(set))
}
var getAccessTokenVerifyAndParse = defaultGetAccessTokenVerifyAndParse
// Based on GIST: https://gist.github.com/hyg/9c4afcd91fe24316cbf0
func openbrowser(url string) error {
switch runtime.GOOS {
case "linux":
return exec.Command("xdg-open", url).Start()
case "windows":
return exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
case "darwin":
return exec.Command("open", url).Start()
}
return fmt.Errorf("unsupported platform")
}