feat(idp): provide option to auto link user (#7734)

* init auto linking

* prompt handling

* working

* translations

* console

* fixes

* unify

* custom texts

* fix tests

* linting

* fix check of existing user

* fix bg translation

* set unspecified as default in the form

internal/domain/custom_login_text.go

@@ -264,6 +264,12 @@ const (
 	LoginKeyRegisterOrgSaveButtonText       = LoginKeyRegistrationOrg + "SaveButtonText"
 	LoginKeyRegisterOrgBackButtonText       = LoginKeyRegistrationOrg + "BackButtonText"
 
+	LoginKeyLinkingUserPrompt                = "LinkingUserPrompt."
+	LoginKeyLinkingUserPromptTitle           = LoginKeyLinkingUserPrompt + "Title"
+	LoginKeyLinkingUserPromptDescription     = LoginKeyLinkingUserPrompt + "Description"
+	LoginKeyLinkingUserPromptLinkButtonText  = LoginKeyLinkingUserPrompt + "LinkButtonText"
+	LoginKeyLinkingUserPromptOtherButtonText = LoginKeyLinkingUserPrompt + "OtherButtonText"
+
 	LoginKeyLinkingUserDone                 = "LinkingUsersDone."
 	LoginKeyLinkingUserDoneTitle            = LoginKeyLinkingUserDone + "Title"
 	LoginKeyLinkingUserDoneDescription      = LoginKeyLinkingUserDone + "Description"
@@ -336,6 +342,7 @@ type CustomLoginText struct {
 	RegistrationUser                 RegistrationUserScreenText
 	ExternalRegistrationUserOverview ExternalRegistrationUserOverviewScreenText
 	RegistrationOrg                  RegistrationOrgScreenText
+	LinkingUserPrompt                LinkingUserPromptScreenText
 	LinkingUsersDone                 LinkingUserDoneScreenText
 	ExternalNotFound                 ExternalUserNotFoundScreenText
 	LoginSuccess                     SuccessLoginScreenText
@@ -607,6 +614,13 @@ type RegistrationOrgScreenText struct {
 	SaveButtonText       string
 }
 
+type LinkingUserPromptScreenText struct {
+	Title           string
+	Description     string
+	LinkButtonText  string
+	OtherButtonText string
+}
+
 type LinkingUserDoneScreenText struct {
 	Title            string
 	Description      string

internal/domain/idp.go

@@ -126,3 +126,11 @@ func (s IDPIntentState) Valid() bool {
 func (s IDPIntentState) Exists() bool {
 	return s != IDPIntentStateUnspecified && s != IDPIntentStateFailed //TODO: ?
 }
+
+type AutoLinkingOption uint8
+
+const (
+	AutoLinkingOptionUnspecified AutoLinkingOption = iota
+	AutoLinkingOptionUsername
+	AutoLinkingOptionEmail
+)