feat: add SAML as identity provider (#6454)

* feat: first implementation for saml sp

* fix: add command side instance and org for saml provider

* fix: add query side instance and org for saml provider

* fix: request handling in event and retrieval of finished intent

* fix: add review changes and integration tests

* fix: add integration tests for saml idp

* fix: correct unit tests with review changes

* fix: add saml session unit test

* fix: add saml session unit test

* fix: add saml session unit test

* fix: changes from review

* fix: changes from review

* fix: proto build error

* fix: proto build error

* fix: proto build error

* fix: proto require metadata oneof

* fix: login with saml provider

* fix: integration test for saml assertion

* lint client.go

* fix json tag

* fix: linting

* fix import

* fix: linting

* fix saml idp query

* fix: linting

* lint: try all issues

* revert linting config

* fix: add regenerate endpoints

* fix: translations

* fix mk.yaml

* ignore acs path for user agent cookie

* fix: add AuthFromProvider test for saml

* fix: integration test for saml retrieve information

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/idp/providers/saml/mapper.go

@@ -0,0 +1,90 @@
+package saml
+
+import (
+	"github.com/crewjam/saml"
+	"golang.org/x/text/language"
+
+	"github.com/zitadel/zitadel/internal/domain"
+	"github.com/zitadel/zitadel/internal/idp"
+)
+
+var _ idp.User = (*UserMapper)(nil)
+
+// UserMapper is an implementation of [idp.User].
+type UserMapper struct {
+	ID         string              `json:"id,omitempty"`
+	Attributes map[string][]string `json:"attributes,omitempty"`
+}
+
+func NewUser() *UserMapper {
+	return &UserMapper{Attributes: map[string][]string{}}
+}
+
+func (u *UserMapper) SetID(id *saml.NameID) {
+	u.ID = id.Value
+}
+
+// GetID is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetID() string {
+	return u.ID
+}
+
+// GetFirstName is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetFirstName() string {
+	return ""
+}
+
+// GetLastName is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetLastName() string {
+	return ""
+}
+
+// GetDisplayName is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetDisplayName() string {
+	return ""
+}
+
+// GetNickname is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetNickname() string {
+	return ""
+}
+
+// GetPreferredUsername is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetPreferredUsername() string {
+	return ""
+}
+
+// GetEmail is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetEmail() domain.EmailAddress {
+	return ""
+}
+
+// IsEmailVerified is an implementation of the [idp.User] interface.
+func (u *UserMapper) IsEmailVerified() bool {
+	return false
+}
+
+// GetPhone is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetPhone() domain.PhoneNumber {
+	return ""
+}
+
+// IsPhoneVerified is an implementation of the [idp.User] interface.
+func (u *UserMapper) IsPhoneVerified() bool {
+	return false
+}
+
+// GetPreferredLanguage is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetPreferredLanguage() language.Tag {
+	return language.Und
+}
+
+// GetAvatarURL is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetAvatarURL() string {
+	return ""
+}
+
+// GetProfile is an implementation of the [idp.User] interface.
+func (u *UserMapper) GetProfile() string {
+	return ""
+}