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login.go
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login.go
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package features
import (
"errors"
"fmt"
"html"
"net"
"net/http"
"net/url"
"time"
"github.com/yolo-sh/cli/internal/config"
"github.com/yolo-sh/cli/internal/constants"
"github.com/yolo-sh/cli/internal/exceptions"
"github.com/yolo-sh/cli/internal/interfaces"
"golang.org/x/oauth2"
)
type LoginInput struct{}
type LoginResponseContent struct{}
type LoginResponse struct {
Error error
Content LoginResponseContent
}
type LoginPresenter interface {
PresentToView(LoginResponse)
}
type LoginFeature struct {
presenter LoginPresenter
logger interfaces.Logger
browser interfaces.BrowserManager
userConfig interfaces.UserConfigManager
sleeper interfaces.Sleeper
github interfaces.GitHubManager
}
func NewLoginFeature(
presenter LoginPresenter,
logger interfaces.Logger,
browser interfaces.BrowserManager,
config interfaces.UserConfigManager,
sleeper interfaces.Sleeper,
github interfaces.GitHubManager,
) LoginFeature {
return LoginFeature{
presenter: presenter,
logger: logger,
browser: browser,
userConfig: config,
sleeper: sleeper,
github: github,
}
}
func (l LoginFeature) Execute(input LoginInput) error {
handleError := func(err error) error {
l.presenter.PresentToView(LoginResponse{
Error: exceptions.ErrLoginError{
Reason: err.Error(),
},
})
return err
}
gitHubOAuthCbHandlerResp := struct {
Error error
AccessToken string
}{}
gitHubOauthCbHandlerDoneChan := make(chan struct{})
gitHubOAuthCbHandler := func(w http.ResponseWriter, r *http.Request) {
defer close(gitHubOauthCbHandlerDoneChan)
queryComponents, err := url.ParseQuery(r.URL.RawQuery)
if err != nil {
gitHubOAuthCbHandlerResp.Error = err
return
}
errorInQuery, hasErrorInQuery := queryComponents["error"]
if hasErrorInQuery {
msg := "<h1>Error!</h1>"
msg = msg + "<p>" + html.EscapeString(errorInQuery[0]) + "</p>"
w.WriteHeader(500)
w.Write([]byte(msg))
gitHubOAuthCbHandlerResp.Error = errors.New(errorInQuery[0])
return
}
accessTokenInQuery, hasAccessTokenInQuery := queryComponents["access_token"]
if !hasAccessTokenInQuery {
msg := "<h1>Error!</h1>"
msg = msg + "<p>An unknown error occured during GitHub connection. Please retry.</p>"
w.WriteHeader(500)
w.Write([]byte(msg))
gitHubOAuthCbHandlerResp.Error = errors.New("no access token returned after authorization")
return
}
msg := "<h1>Success!</h1>"
msg = msg + "<p>Your GitHub account is now connected. You can close this tab and go back to the Yolo CLI.</p>"
w.WriteHeader(200)
w.Write([]byte(msg))
gitHubOAuthCbHandlerResp.AccessToken = accessTokenInQuery[0]
} // <- End of gitHubOAuthCbHandler
http.HandleFunc(
config.GitHubOAuthAPIToCLIURLPath,
gitHubOAuthCbHandler,
)
// Assign a random port to our http server
httpListener, err := net.Listen("tcp", ":0")
if err != nil {
return handleError(err)
}
httpServerServeErrorChan := make(chan error, 1)
go func() {
httpServerServeErrorChan <- http.Serve(httpListener, nil)
}()
httpListenPort := httpListener.Addr().(*net.TCPAddr).Port
gitHubOAuthClient := &oauth2.Config{
ClientID: config.GitHubOAuthClientID,
Scopes: config.GitHubOAuthScopes,
Endpoint: oauth2.Endpoint{
AuthURL: "https://github.com/login/oauth/authorize",
},
RedirectURL: config.GitHubOAuthCLIToAPIURL,
}
// Listen port is passed through OAuth
// state because GitHub doesn't support
// dynamic redirect URIs
gitHubOAuthAuthorizeURL := gitHubOAuthClient.AuthCodeURL(
fmt.Sprintf("%d", httpListenPort),
)
bold := constants.Bold
l.logger.Log(bold("\nYou will be taken to your browser to connect your GitHub account...\n"))
l.logger.Info("If your browser doesn't open automatically, go to the following link:\n")
l.logger.Log("%s", gitHubOAuthAuthorizeURL)
l.sleeper.Sleep(4 * time.Second)
if err := l.browser.OpenURL(gitHubOAuthAuthorizeURL); err != nil {
l.logger.Error(
"\nCannot open browser! Please visit above URL ↑",
)
}
l.logger.Warning("\nWaiting for GitHub authorization... (Press Ctrl-C to quit)\n")
select {
case httpServerServeError := <-httpServerServeErrorChan:
return handleError(httpServerServeError)
case <-gitHubOauthCbHandlerDoneChan:
// We swallow the httpListener.Close() error here
// given that the CLI will exit and force all
// resources to be released
_ = httpListener.Close()
}
if gitHubOAuthCbHandlerResp.Error != nil {
return handleError(gitHubOAuthCbHandlerResp.Error)
}
githubUser, err := l.github.GetAuthenticatedUser(
gitHubOAuthCbHandlerResp.AccessToken,
)
if err != nil {
return handleError(err)
}
l.userConfig.Set(
config.UserConfigKeyUserIsLoggedIn,
true,
)
l.userConfig.Set(
config.UserConfigKeyGitHubAccessToken,
gitHubOAuthCbHandlerResp.AccessToken,
)
l.userConfig.PopulateFromGitHubUser(
githubUser,
)
if err := l.userConfig.WriteConfig(); err != nil {
return handleError(err)
}
l.presenter.PresentToView(LoginResponse{})
return nil
}