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github-code-exchange.go
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github-code-exchange.go
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package github
/*
https://docs.github.com/en/rest/users/users?apiVersion=2022-11-28#get-the-authenticated-user
https://docs.github.com/en/rest/users/emails?apiVersion=2022-11-28#list-email-addresses-for-the-authenticated-user
*/
import (
"context"
"strconv"
di "github.com/fluffy-bunny/fluffy-dozm-di"
contracts_codeexchange "github.com/fluffy-bunny/fluffycore-rage-identity/pkg/contracts/codeexchange"
contracts_config "github.com/fluffy-bunny/fluffycore-rage-identity/pkg/contracts/config"
contracts_oauth2factory "github.com/fluffy-bunny/fluffycore-rage-identity/pkg/contracts/oauth2factory"
contracts_tokenservice "github.com/fluffy-bunny/fluffycore-rage-identity/pkg/contracts/tokenservice"
fluffycore_services_claims "github.com/fluffy-bunny/fluffycore/services/claims"
fluffycore_utils "github.com/fluffy-bunny/fluffycore/utils"
status "github.com/gogo/status"
req "github.com/imroc/req/v3"
zerolog "github.com/rs/zerolog"
oauth2 "golang.org/x/oauth2"
codes "google.golang.org/grpc/codes"
)
type (
service struct {
config *contracts_config.Config
oauth2Factory contracts_oauth2factory.IOAuth2Factory
tokenService contracts_tokenservice.ITokenService
}
GithubUser struct {
ID int `json:"id"`
UserName string `json:"login"`
Email string `json:"email"`
}
GitHubEmail struct {
Email string `json:"email"`
Verified bool `json:"verified"`
Primary bool `json:"primary"`
Visibility string `json:"visibility"`
}
GithubUserEmails []GitHubEmail
)
const (
// https://docs.github.com/en/developers/apps/building-oauth-apps/authorizing-oauth-apps#1-request-a-users-github-identity
GithubAuthURL = "https://github.com/login/oauth/authorize"
// https://docs.github.com/en/developers/apps/building-oauth-apps/authorizing-oauth-apps#2-users-are-redirected-back-to-your-site-by-github
GithubTokenURL = "https://github.com/login/oauth/access_token"
GithubUserInfoEndpoint = "https://api.github.com/user"
GitHubEmailsEndpoint = "https://api.github.com/user/emails"
)
var GithubScopes = []string{"user:email"}
var stemService = (*service)(nil)
func init() {
var _ contracts_codeexchange.IGithubCodeExchange = stemService
}
func (s *service) Ctor(config *contracts_config.Config,
tokenService contracts_tokenservice.ITokenService,
oauth2Factory contracts_oauth2factory.IOAuth2Factory) (contracts_codeexchange.IGithubCodeExchange, error) {
return &service{
config: config,
oauth2Factory: oauth2Factory,
tokenService: tokenService,
}, nil
}
func AddSingletonIGithubCodeExchange(cb di.ContainerBuilder) {
di.AddSingleton[contracts_codeexchange.IGithubCodeExchange](cb, stemService.Ctor)
}
func (s *service) validateExchangeCodeRequest(request *contracts_codeexchange.ExchangeCodeRequest) error {
if request == nil {
return status.Error(codes.InvalidArgument, "request is required")
}
if fluffycore_utils.IsEmptyOrNil(request.Code) {
return status.Error(codes.InvalidArgument, "code is required")
}
if fluffycore_utils.IsEmptyOrNil(request.CodeVerifier) {
return status.Error(codes.InvalidArgument, "CodeVerifier is required")
}
return nil
}
var Duration30MinutesSeconds = 1800
func (s *service) ExchangeCode(ctx context.Context, request *contracts_codeexchange.ExchangeCodeRequest) (*contracts_codeexchange.ExchangeCodeResponse, error) {
log := zerolog.Ctx(ctx).With().Logger()
if err := s.validateExchangeCodeRequest(request); err != nil {
return nil, err
}
// get the config
getConfigRequest := &contracts_oauth2factory.GetConfigRequest{
IDPHint: request.IDPHint,
}
getConfigResponse, err := s.oauth2Factory.GetConfig(ctx, getConfigRequest)
if err != nil {
log.Error().Err(err).Msg("failed to get config")
return nil, err
}
config := getConfigResponse.Config
token, err := config.Exchange(context.Background(), request.Code, oauth2.SetAuthURLParam("code_verifier", request.CodeVerifier))
if err != nil {
log.Error().Err(err).Msg("failed to exchange code")
return nil, err
}
client := req.C().
SetCommonBearerAuthToken(token.AccessToken).
SetCommonHeader("Accept", "application/vnd.github.v3+json").
SetCommonHeader("X-GitHub-Api-Version", "2022-11-28")
githubUser := &GithubUser{}
r, err := client.R().
SetSuccessResult(githubUser).Get(GithubUserInfoEndpoint)
if err != nil {
log.Error().Err(err).Msg("")
return nil, err
}
if r.StatusCode != 200 {
log.Error().Err(err).Msg("failed to get user info")
return nil, status.Error(codes.Internal, "failed to get user info")
}
githubEmails := make(GithubUserEmails, 0)
r, err = client.R().
SetSuccessResult(&githubEmails).Get(GitHubEmailsEndpoint)
if err != nil {
log.Error().Err(err).Msg("")
return nil, err
}
if r.StatusCode != 200 {
log.Error().Err(err).Msg("failed to get user info")
return nil, status.Error(codes.Internal, "failed to get user info")
}
var primaryEmail *GitHubEmail
for _, e := range githubEmails {
if fluffycore_utils.IsEmptyOrNil(e.Email) {
continue
}
if e.Primary {
primaryEmail = &e
}
}
claims := fluffycore_services_claims.NewClaims()
claims.Set("sub", strconv.Itoa(githubUser.ID))
claims.Set("idp", request.IDPHint)
if primaryEmail != nil {
claims.Set("email", primaryEmail.Email)
claims.Set("email_verified", primaryEmail.Verified)
} else {
// if we don't have an email, we can't mint a token
return nil, status.Error(codes.Internal, "failed to get user info, can't get emails")
}
mintTokenResponse, err := s.tokenService.MintToken(ctx,
&contracts_tokenservice.MintTokenRequest{
DurationLifeTimeSeconds: Duration30MinutesSeconds,
Claims: claims,
})
if err != nil {
log.Error().Err(err).Msg("failed to mint token")
return nil, err
}
return &contracts_codeexchange.ExchangeCodeResponse{
IdToken: mintTokenResponse.Token,
}, nil
}