SAML: Support auto login (#61685)

* SAML: Support auto login

* Add individual auto_login option for each OAuth provider

* Docs: Describe new auto_login option

* Minor refactor

conf/sample.ini

@@ -478,6 +478,7 @@
 
 # Set to true to attempt login with OAuth automatically, skipping the login screen.
 # This setting is ignored if multiple OAuth providers are configured.
+# Deprecated, use auto_login option for specific provider instead.
 ;oauth_auto_login = false
 
 # OAuth state max age cookie duration in seconds. Defaults to 600 seconds.
@@ -519,6 +520,7 @@
 [auth.github]
 ;enabled = false
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_id
 ;client_secret = some_secret
 ;scopes = user:email,read:org
@@ -536,6 +538,7 @@
 [auth.gitlab]
 ;enabled = false
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_id
 ;client_secret = some_secret
 ;scopes = api
@@ -552,6 +555,7 @@
 [auth.google]
 ;enabled = false
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_client_id
 ;client_secret = some_client_secret
 ;scopes = https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email
@@ -566,6 +570,7 @@
 [auth.grafana_com]
 ;enabled = false
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_id
 ;client_secret = some_secret
 ;scopes = user:email
@@ -577,6 +582,7 @@
 ;name = Azure AD
 ;enabled = false
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_client_id
 ;client_secret = some_client_secret
 ;scopes = openid email profile
@@ -594,6 +600,7 @@
 ;name = Okta
 ;enabled = false
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_id
 ;client_secret = some_secret
 ;scopes = openid profile email groups
@@ -611,6 +618,7 @@
 ;enabled = false
 ;name = OAuth
 ;allow_sign_up = true
+;auto_login = false
 ;client_id = some_id
 ;client_secret = some_secret
 ;scopes = user:email,read:org