Expose additional emails in {DAV:}alternate-URI-set

This allows iMip invitations to be send with an alternative email as
"Reply-To" field.

Closes #27201

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

3 files changed, 20 insertions, 0 deletions

diff --git a/apps/dav/lib/Command/CreateCalendar.php b/apps/dav/lib/Command/CreateCalendar.php
index 2bea82a345e..8a945f32eba 100644
--- a/apps/dav/lib/Command/CreateCalendar.php
+++ b/apps/dav/lib/Command/CreateCalendar.php
@@ -29,6 +29,7 @@ use OC\KnownUser\KnownUserService;
 use OCA\DAV\CalDAV\CalDavBackend;
 use OCA\DAV\CalDAV\Proxy\ProxyMapper;
 use OCA\DAV\Connector\Sabre\Principal;
+use OCP\Accounts\IAccountManager;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\IConfig;
 use OCP\IDBConnection;
@@ -83,6 +84,7 @@ class CreateCalendar extends Command {
 		$principalBackend = new Principal(
 			$this->userManager,
 			$this->groupManager,
+			\OC::$server->get(IAccountManager::class),
 			\OC::$server->getShareManager(),
 			\OC::$server->getUserSession(),
 			\OC::$server->getAppManager(),
diff --git a/apps/dav/lib/Connector/Sabre/Principal.php b/apps/dav/lib/Connector/Sabre/Principal.php
index 94e3978e67d..75bee4e7b42 100644
--- a/apps/dav/lib/Connector/Sabre/Principal.php
+++ b/apps/dav/lib/Connector/Sabre/Principal.php
@@ -41,6 +41,9 @@ use OC\KnownUser\KnownUserService;
 use OCA\Circles\Exceptions\CircleNotFoundException;
 use OCA\DAV\CalDAV\Proxy\ProxyMapper;
 use OCA\DAV\Traits\PrincipalProxyTrait;
+use OCP\Accounts\IAccountManager;
+use OCP\Accounts\IAccountProperty;
+use OCP\Accounts\PropertyDoesNotExistException;
 use OCP\App\IAppManager;
 use OCP\AppFramework\QueryException;
 use OCP\Constants;
@@ -64,6 +67,9 @@ class Principal implements BackendInterface {
 	/** @var IGroupManager */
 	private $groupManager;
 
+	/** @var IAccountManager */
+	private $accountManager;
+
 	/** @var IShareManager */
 	private $shareManager;
 
@@ -95,6 +101,7 @@ class Principal implements BackendInterface {
 
 	public function __construct(IUserManager $userManager,
 								IGroupManager $groupManager,
+								IAccountManager $accountManager,
 								IShareManager $shareManager,
 								IUserSession $userSession,
 								IAppManager $appManager,
@@ -105,6 +112,7 @@ class Principal implements BackendInterface {
 								string $principalPrefix = 'principals/users/') {
 		$this->userManager = $userManager;
 		$this->groupManager = $groupManager;
+		$this->accountManager = $accountManager;
 		$this->shareManager = $shareManager;
 		$this->userSession = $userSession;
 		$this->appManager = $appManager;
@@ -506,6 +514,7 @@ class Principal implements BackendInterface {
 	/**
 	 * @param IUser $user
 	 * @return array
+	 * @throws PropertyDoesNotExistException
 	 */
 	protected function userToPrincipal($user) {
 		$userId = $user->getUID();
@@ -517,11 +526,18 @@ class Principal implements BackendInterface {
 			'{http://nextcloud.com/ns}language' => $this->languageFactory->getUserLanguage($user),
 		];
 
+		$account = $this->accountManager->getAccount($user);
+		$alternativeEmails = array_map(fn (IAccountProperty $property) => 'mailto:' . $property->getValue(), $account->getPropertyCollection(IAccountManager::COLLECTION_EMAIL)->getProperties());
+
 		$email = $user->getSystemEMailAddress();
 		if (!empty($email)) {
 			$principal['{http://sabredav.org/ns}email-address'] = $email;
 		}
 
+		if (!empty($alternativeEmails)) {
+			$principal['{DAV:}alternate-URI-set'] = $alternativeEmails;
+		}
+
 		return $principal;
 	}
 
diff --git a/apps/dav/lib/RootCollection.php b/apps/dav/lib/RootCollection.php
index 8a11a676609..359037587a5 100644
--- a/apps/dav/lib/RootCollection.php
+++ b/apps/dav/lib/RootCollection.php
@@ -43,6 +43,7 @@ use OCA\DAV\DAV\GroupPrincipalBackend;
 use OCA\DAV\DAV\SystemPrincipalBackend;
 use OCA\DAV\Provisioning\Apple\AppleProvisioningNode;
 use OCA\DAV\Upload\CleanupService;
+use OCP\Accounts\IAccountManager;
 use OCP\App\IAppManager;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\EventDispatcher\IEventDispatcher;
@@ -68,6 +69,7 @@ class RootCollection extends SimpleCollection {
 		$userPrincipalBackend = new Principal(
 			$userManager,
 			$groupManager,
+			\OC::$server->get(IAccountManager::class),
 			$shareManager,
 			\OC::$server->getUserSession(),
 			\OC::$server->getAppManager(),