feat: add basic structure of idp templates (#5053)

add basic structure and implement first providers for IDP templates to be able to manage and use them in the future

internal/idp/providers/jwt/session.go

@@ -0,0 +1,72 @@
+package jwt
+
+import (
+	"context"
+
+	"github.com/zitadel/oidc/v2/pkg/oidc"
+	"golang.org/x/text/language"
+
+	"github.com/zitadel/zitadel/internal/idp"
+)
+
+var _ idp.Session = (*Session)(nil)
+
+// Session is the [idp.Session] implementation for the JWT provider
+type Session struct {
+	AuthURL string
+	Tokens  *oidc.Tokens
+}
+
+// GetAuthURL implements the [idp.Session] interface
+func (s *Session) GetAuthURL() string {
+	return s.AuthURL
+}
+
+// FetchUser implements the [idp.Session] interface.
+// It will map the received idToken into an [idp.User].
+func (s *Session) FetchUser(ctx context.Context) (user idp.User, err error) {
+	if s.Tokens == nil {
+		return nil, ErrNoTokens
+	}
+	return &User{s.Tokens.IDTokenClaims}, nil
+}
+
+type User struct {
+	oidc.IDTokenClaims
+}
+
+func (u *User) GetID() string {
+	return u.IDTokenClaims.GetSubject()
+}
+
+func (u *User) GetFirstName() string {
+	return u.IDTokenClaims.GetGivenName()
+}
+
+func (u *User) GetLastName() string {
+	return u.IDTokenClaims.GetFamilyName()
+}
+
+func (u *User) GetDisplayName() string {
+	return u.IDTokenClaims.GetName()
+}
+
+func (u *User) GetNickname() string {
+	return u.IDTokenClaims.GetNickname()
+}
+
+func (u *User) GetPhone() string {
+	return u.IDTokenClaims.GetPhoneNumber()
+}
+
+func (u *User) IsPhoneVerified() bool {
+	return u.IDTokenClaims.IsPhoneNumberVerified()
+}
+
+func (u *User) GetPreferredLanguage() language.Tag {
+	return u.IDTokenClaims.GetLocale()
+}
+
+func (u *User) GetAvatarURL() string {
+	return u.IDTokenClaims.GetPicture()
+}