chore: move the go code into a subfolder

apps/api/internal/idp/providers/oauth/session.go

@@ -0,0 +1,91 @@
+package oauth
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"github.com/zitadel/oidc/v3/pkg/client/rp"
+	httphelper "github.com/zitadel/oidc/v3/pkg/http"
+	"github.com/zitadel/oidc/v3/pkg/oidc"
+
+	"github.com/zitadel/zitadel/internal/idp"
+)
+
+var ErrCodeMissing = errors.New("no auth code provided")
+
+const (
+	CodeVerifier = "codeVerifier"
+)
+
+var _ idp.Session = (*Session)(nil)
+
+// Session is the [idp.Session] implementation for the OAuth2.0 provider.
+type Session struct {
+	AuthURL      string
+	CodeVerifier string
+	Code         string
+	Tokens       *oidc.Tokens[*oidc.IDTokenClaims]
+
+	Provider *Provider
+}
+
+func NewSession(provider *Provider, code string, idpArguments map[string]any) *Session {
+	verifier, _ := idpArguments[CodeVerifier].(string)
+	return &Session{Provider: provider, Code: code, CodeVerifier: verifier}
+}
+
+// GetAuth implements the [idp.Session] interface.
+func (s *Session) GetAuth(ctx context.Context) (idp.Auth, error) {
+	return idp.Redirect(s.AuthURL)
+}
+
+// PersistentParameters implements the [idp.Session] interface.
+func (s *Session) PersistentParameters() map[string]any {
+	if s.CodeVerifier == "" {
+		return nil
+	}
+	return map[string]any{CodeVerifier: s.CodeVerifier}
+}
+
+// FetchUser implements the [idp.Session] interface.
+// It will execute an OAuth 2.0 code exchange if needed to retrieve the access token,
+// call the specified userEndpoint and map the received information into an [idp.User].
+func (s *Session) FetchUser(ctx context.Context) (_ idp.User, err error) {
+	if s.Tokens == nil {
+		if err = s.authorize(ctx); err != nil {
+			return nil, err
+		}
+	}
+	req, err := http.NewRequest("GET", s.Provider.userEndpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("authorization", s.Tokens.TokenType+" "+s.Tokens.AccessToken)
+	user := s.Provider.User()
+	if err := httphelper.HttpRequest(s.Provider.RelyingParty.HttpClient(), req, &user); err != nil {
+		return nil, err
+	}
+	return user, nil
+}
+
+func (s *Session) ExpiresAt() time.Time {
+	if s.Tokens == nil {
+		return time.Time{}
+	}
+	return s.Tokens.Expiry
+}
+
+func (s *Session) authorize(ctx context.Context) (err error) {
+	if s.Code == "" {
+		return ErrCodeMissing
+	}
+	var opts []rp.CodeExchangeOpt
+	if s.CodeVerifier != "" {
+		opts = append(opts, rp.WithCodeVerifier(s.CodeVerifier))
+	}
+	s.Tokens, err = rp.CodeExchange[*oidc.IDTokenClaims](ctx, s.Code, s.Provider.RelyingParty, opts...)
+
+	return err
+}