feat(globalscale): Expose more configs

These are the configs used in a bunch of applications (e.g. user_saml
and user_oidc). Standarize them.

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

Author: CarlSchwan

lib/private/GlobalScale/Config.php

@@ -35,4 +35,24 @@ public function onlyInternalFederation(): bool {
 
 		return $enabled === 'internal';
 	}
+
+	#[Override]
+	public function isPrimary(): bool {
+		return $this->isGlobalScaleEnabled()
+			&& ($this->config->getSystemValueString('gss.mode', 'slave') === 'master'
+				|| $this->config->getSystemValueString('gss.mode', 'slave') === 'primary');
+	}
+
+	#[Override]
+	public function isSecondary(): bool {
+		return $this->isGlobalScaleEnabled()
+			&& ($this->config->getSystemValueString('gss.mode', 'slave') === 'slave'
+				|| $this->config->getSystemValueString('gss.mode', 'slave') === 'secondary');
+	}
+
+	#[Override]
+	public function isPrimaryAdmin(string $userId): bool {
+		return in_array($userId, $this->config->getSystemValue('gss.master.admin', []))
+			|| in_array($userId, $this->config->getSystemValue('gss.primary.admin', []));
+	}
 }

lib/public/GlobalScale/IConfig.php

@@ -31,4 +31,33 @@ public function isGlobalScaleEnabled(): bool;
 	 * @since 12.0.1
 	 */
 	public function onlyInternalFederation(): bool;
+
+	/**
+	 * Check if the current instance is the primary instance.
+	 *
+	 * This instance is then only used to log in the users and then redirect them
+	 * to their associated secondary instance.
+	 *
+	 * @since 34.0.3
+	 */
+	public function isPrimary(): bool;
+
+	/**
+	 * Check if the current instance is one of the secondary instance.
+	 *
+	 * These instances are the actual instance of a user and hold all their data.
+	 *
+	 * @since 34.0.3
+	 */
+	public function isSecondary(): bool;
+
+	/**
+	 * Check if the given user is one of the admin on the primary instance.
+	 *
+	 * These users won't be redirected to a secondary instance and instead will
+	 * stay on the primary instance to manage the configuration of the instance.
+	 *
+	 * @since 34.0.3
+	 */
+	public function isPrimaryAdmin(string $userId): bool;
 }