New core setting : shareapi_only_share_with_group_members_exclude_gro…

…up_list (issue 37677)

apps/settings/l10n/en_GB.js

@@ -483,6 +483,7 @@ OC.L10N.register(
     "Allow resharing" : "Allow resharing",
     "Allow sharing with groups" : "Allow sharing with groups",
     "Restrict users to only share with users in their groups" : "Restrict users to only share with users in their groups",
+    "Exclude some groups from sharing with users in their group" : "Exclude some groups from sharing with users in their group",
     "Exclude groups from sharing" : "Exclude groups from sharing",
     "These groups will still be able to receive shares, but not to initiate them." : "These groups will still be able to receive shares, but not to initiate them.",
     "Allow username autocompletion in share dialog" : "Allow username autocompletion in share dialogue",

apps/settings/l10n/en_GB.json

@@ -481,6 +481,7 @@
     "Allow resharing" : "Allow resharing",
     "Allow sharing with groups" : "Allow sharing with groups",
     "Restrict users to only share with users in their groups" : "Restrict users to only share with users in their groups",
+    "Exclude some groups from sharing with users in their group" : "Exclude some groups from sharing with users in their group",
     "Exclude groups from sharing" : "Exclude groups from sharing",
     "These groups will still be able to receive shares, but not to initiate them." : "These groups will still be able to receive shares, but not to initiate them.",
     "Allow username autocompletion in share dialog" : "Allow username autocompletion in share dialogue",

apps/settings/l10n/fr.js

@@ -483,6 +483,7 @@ OC.L10N.register(
     "Allow resharing" : "Autoriser le repartage",
     "Allow sharing with groups" : "Autoriser le partage avec les groupes",
     "Restrict users to only share with users in their groups" : "N'autoriser les partages qu'entre membres de mêmes groupes",
+    "Exclude some groups from sharing with users in their group" : "Empêcher certains groupes de partager avec les utilisateurs de leur groupe",
     "Exclude groups from sharing" : "Empêcher certains groupes de partager",
     "These groups will still be able to receive shares, but not to initiate them." : "Ces groupes ne pourront plus initier de partage, mais ils pourront toujours rejoindre les partages faits par d'autres. ",
     "Allow username autocompletion in share dialog" : "Autoriser l'autocomplétion du nom d'utilisateur dans la boite de dialogue de partage",

apps/settings/l10n/fr.json

@@ -481,6 +481,7 @@
     "Allow resharing" : "Autoriser le repartage",
     "Allow sharing with groups" : "Autoriser le partage avec les groupes",
     "Restrict users to only share with users in their groups" : "N'autoriser les partages qu'entre membres de mêmes groupes",
+    "Exclude some groups from sharing with users in their group" : "Empêcher certains groupes de partager avec les utilisateurs de leur groupe",
     "Exclude groups from sharing" : "Empêcher certains groupes de partager",
     "These groups will still be able to receive shares, but not to initiate them." : "Ces groupes ne pourront plus initier de partage, mais ils pourront toujours rejoindre les partages faits par d'autres. ",
     "Allow username autocompletion in share dialog" : "Autoriser l'autocomplétion du nom d'utilisateur dans la boite de dialogue de partage",

apps/settings/lib/Settings/Admin/Sharing.php

@@ -76,6 +76,9 @@ public function getForm() {
 		$excludedPasswordGroupsList = !is_null(json_decode($excludedPasswordGroups))
 			? implode('|', json_decode($excludedPasswordGroups, true)) : '';
 
+		$shareWithGroupMembersExcludeGroups = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members_exclude_group_list', '');
+		$shareWithGroupMembersExcludeGroupsList = !is_null(json_decode($shareWithGroupMembersExcludeGroups))
+			? implode('|', json_decode($shareWithGroupMembersExcludeGroups, true)) : '';
 
 		$parameters = [
 			// Built-In Sharing
@@ -96,6 +99,7 @@ public function getForm() {
 			'passwordExcludedGroups' => $excludedPasswordGroupsList,
 			'passwordExcludedGroupsFeatureEnabled' => $this->config->getSystemValueBool('sharing.allow_disabled_password_enforcement_groups', false),
 			'onlyShareWithGroupMembers' => $this->shareManager->shareWithGroupMembersOnly(),
+			'shareWithGroupMembersExcludeGroupsList'=> $shareWithGroupMembersExcludeGroupsList,
 			'shareAPIEnabled' => $this->config->getAppValue('core', 'shareapi_enabled', 'yes'),
 			'shareDefaultExpireDateSet' => $this->config->getAppValue('core', 'shareapi_default_expire_date', 'no'),
 			'shareExpireAfterNDays' => $this->config->getAppValue('core', 'shareapi_expire_after_n_days', '7'),

apps/settings/src/admin.js

@@ -1,5 +1,5 @@
 window.addEventListener('DOMContentLoaded', () => {
-	$('#excludedGroups,#linksExcludedGroups,#passwordsExcludedGroups').each(function(index, element) {
+	$('#excludedGroups,#shareGroupMembersExcludeGroups,#linksExcludedGroups,#passwordsExcludedGroups').each(function(index, element) {
 		OC.Settings.setupGroupsSelect($(element))
 		$(element).change(function(ev) {
 			let groups = ev.val || []
@@ -214,6 +214,10 @@ window.addEventListener('DOMContentLoaded', () => {
 		$('#selectExcludedGroups').toggleClass('hidden', !this.checked)
 	})
 
+	$('#onlyShareWithGroupMembers').change(function() {
+		$('#selectShareWithGroupMembersExcludeGroups').toggleClass('hidden', !this.checked)
+	})
+
 	const setupChecks = () => {
 		// run setup checks then gather error messages
 		$.when(

apps/settings/templates/settings/admin/sharing.php

@@ -185,6 +185,13 @@
 } ?> />
 			<label for="onlyShareWithGroupMembers"><?php p($l->t('Restrict users to only share with users in their groups'));?></label><br/>
 		</p>
+		<p id="selectShareWithGroupMembersExcludeGroups" class="indent <?php if (!$_['onlyShareWithGroupMembers'] || $_['shareAPIEnabled'] === 'no') {
+	p('hidden');
+} ?>">
+			 <em><?php p($l->t('Exclude some groups from sharing with users in their group')); ?></em>
+			 <br />
+			<input name="shareapi_only_share_with_group_members_exclude_group_list" type="hidden" id="shareGroupMembersExcludeGroups" value="<?php p($_['shareWithGroupMembersExcludeGroupsList']) ?>" style="width: 400px" class="noJSAutoUpdate"/>
+		</p>
 		<p class="<?php if ($_['shareAPIEnabled'] === 'no') {
 	p('hidden');
 }?>">

lib/private/Collaboration/Collaborators/GroupPlugin.php

@@ -45,6 +45,8 @@ class GroupPlugin implements ISearchPlugin {
 	protected $shareeEnumerationInGroupOnly;
 	/** @var bool */
 	protected $groupSharingDisabled;
+	/** @var array */
+	protected $shareWithGroupOnlyExcludeGroupsList;
 
 	/** @var IGroupManager */
 	private $groupManager;
@@ -62,6 +64,14 @@ public function __construct(IConfig $config, IGroupManager $groupManager, IUserS
 		$this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
 		$this->shareeEnumerationInGroupOnly = $this->shareeEnumeration && $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_to_group', 'no') === 'yes';
 		$this->groupSharingDisabled = $this->config->getAppValue('core', 'shareapi_allow_group_sharing', 'yes') === 'no';
+
+		if ($this->shareWithGroupOnly) {
+			$shareWithGroupOnlyExcludeGroups = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members_exclude_group_list', '');
+			$decodedExcludeGroups = json_decode($shareWithGroupOnlyExcludeGroups, true);
+			$this->shareWithGroupOnlyExcludeGroupsList = $decodedExcludeGroups ?? [];
+		} else {
+			$this->shareWithGroupOnlyExcludeGroupsList = [];
+		}
 	}
 
 	public function search($search, $limit, $offset, ISearchResult $searchResult) {
@@ -89,6 +99,9 @@ public function search($search, $limit, $offset, ISearchResult $searchResult) {
 				return $group->getGID();
 			}, $userGroups);
 			$groupIds = array_intersect($groupIds, $userGroups);
+
+			// ShareWithGroupOnly filtering
+			$groupIds = array_diff( $groupIds, $this->shareWithGroupOnlyExcludeGroupsList);
 		}
 
 		$lowerSearch = strtolower($search);

lib/private/Collaboration/Collaborators/MailPlugin.php

@@ -53,6 +53,8 @@ class MailPlugin implements ISearchPlugin {
 	protected $shareeEnumerationFullMatch;
 	/* @var bool */
 	protected $shareeEnumerationFullMatchEmail;
+	/** @var array */
+	protected $shareWithGroupOnlyExcludeGroupsList;
 
 	/** @var IManager */
 	private $contactsManager;
@@ -91,6 +93,14 @@ public function __construct(IManager $contactsManager,
 		$this->shareeEnumerationPhone = $this->shareeEnumeration && $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_to_phone', 'no') === 'yes';
 		$this->shareeEnumerationFullMatch = $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match', 'yes') === 'yes';
 		$this->shareeEnumerationFullMatchEmail = $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_email', 'yes') === 'yes';
+
+		if ($this->shareWithGroupOnly) {
+			$shareWithGroupOnlyExcludeGroups = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members_exclude_group_list', '');
+			$decodedExcludeGroups = json_decode($shareWithGroupOnlyExcludeGroups, true);
+			$this->shareWithGroupOnlyExcludeGroupsList = $decodedExcludeGroups ?? [];
+		} else {
+			$this->shareWithGroupOnlyExcludeGroupsList = [];
+		}
 	}
 
 	/**
@@ -150,6 +160,10 @@ public function search($search, $limit, $offset, ISearchResult $searchResult) {
 							 * Check if the user may share with the user associated with the e-mail of the just found contact
 							 */
 							$userGroups = $this->groupManager->getUserGroupIds($this->userSession->getUser());
+
+							// ShareWithGroupOnly filtering
+							$userGroups = array_diff( $userGroups, $this->shareWithGroupOnlyExcludeGroupsList);
+
 							$found = false;
 							foreach ($userGroups as $userGroup) {
 								if ($this->groupManager->isInGroup($contact['UID'], $userGroup)) {

lib/private/Collaboration/Collaborators/UserPlugin.php

@@ -60,6 +60,8 @@ class UserPlugin implements ISearchPlugin {
 	protected $shareeEnumerationFullMatchEmail;
 	/* @var bool */
 	protected $shareeEnumerationFullMatchIgnoreSecondDisplayName;
+	/** @var array */
+	protected $shareWithGroupOnlyExcludeGroupsList;
 
 	/** @var IConfig */
 	private $config;
@@ -96,6 +98,14 @@ public function __construct(IConfig $config,
 		$this->shareeEnumerationFullMatchUserId = $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_userid', 'yes') === 'yes';
 		$this->shareeEnumerationFullMatchEmail = $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_email', 'yes') === 'yes';
 		$this->shareeEnumerationFullMatchIgnoreSecondDisplayName = $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_ignore_second_dn', 'no') === 'yes';
+
+		if ($this->shareWithGroupOnly) {
+			$shareWithGroupOnlyExcludeGroups = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members_exclude_group_list', '');
+			$decodedExcludeGroups = json_decode($shareWithGroupOnlyExcludeGroups, true);
+			$this->shareWithGroupOnlyExcludeGroupsList = $decodedExcludeGroups ?? [];
+		} else {
+			$this->shareWithGroupOnlyExcludeGroupsList = [];
+		}
 	}
 
 	public function search($search, $limit, $offset, ISearchResult $searchResult) {
@@ -105,6 +115,10 @@ public function search($search, $limit, $offset, ISearchResult $searchResult) {
 
 		$currentUserId = $this->userSession->getUser()->getUID();
 		$currentUserGroups = $this->groupManager->getUserGroupIds($this->userSession->getUser());
+
+		// ShareWithGroupOnly filtering
+		$currentUserGroups = array_diff( $currentUserGroups, $this->shareWithGroupOnlyExcludeGroupsList);
+
 		if ($this->shareWithGroupOnly || $this->shareeEnumerationInGroupOnly) {
 			// Search in all the groups this user is part of
 			foreach ($currentUserGroups as $userGroupId) {

lib/private/Contacts/ContactsMenu/ContactsStore.php

@@ -125,6 +125,9 @@ public function getContacts(IUser $user, ?string $filter, ?int $limit = null, ?i
 	 *  3. if the `shareapi_only_share_with_group_members` config option is
 	 * enabled it will filter all users which doesn't have a common group
 	 * with the current user.
+	 * If enabled, the 'shareapi_only_share_with_group_members_exclude_group_list'
+	 * config option may specify some groups excluded from the principle of
+	 * belonging to the same group.
 	 *
 	 * @param IUser $self
 	 * @param Entry[] $entries
@@ -160,6 +163,14 @@ private function filterContacts(
 			}
 		}
 
+		// ownGroupsOnly : some groups may be excluded
+		if ($ownGroupsOnly) {
+			$excludeGroupsFromOwnGroups = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members_exclude_group_list', '');
+			$decodedExcludeGroupsFromOwnGroups = json_decode($excludeGroupsFromOwnGroups, true);
+			$excludeGroupsFromOwnGroupsList = $decodedExcludeGroupsFromOwnGroups ?? [];
+			$selfGroups = array_diff( $selfGroups, $excludeGroupsFromOwnGroupsList);
+		}
+
 		$selfUID = $self->getUID();
 
 		return array_values(array_filter($entries, function (IEntry $entry) use ($skipLocal, $ownGroupsOnly, $selfGroups, $selfUID, $disallowEnumeration, $restrictEnumerationGroup, $restrictEnumerationPhone, $allowEnumerationFullMatch, $filter) {

lib/private/Share20/Manager.php

@@ -550,6 +550,11 @@ protected function userCreateChecks(IShare $share) {
 				$this->groupManager->getUserGroupIds($sharedBy),
 				$this->groupManager->getUserGroupIds($sharedWith)
 			);
+
+			// optional excluded groups
+			$excludedGroups = $this->shareWithGroupMembersOnlyExcludedGroupsList();
+			$groups = array_diff($groups, $excludedGroups);
+
 			if (empty($groups)) {
 				$message_t = $this->l->t('Sharing is only allowed with group members');
 				throw new \Exception($message_t);
@@ -610,7 +615,10 @@ protected function groupCreateChecks(IShare $share) {
 		if ($this->shareWithGroupMembersOnly()) {
 			$sharedBy = $this->userManager->get($share->getSharedBy());
 			$sharedWith = $this->groupManager->get($share->getSharedWith());
-			if (is_null($sharedWith) || !$sharedWith->inGroup($sharedBy)) {
+
+			// optional excluded groups
+			$excludedGroups = $this->shareWithGroupMembersOnlyExcludedGroupsList();
+			if (is_null($sharedWith) || in_array($share->getSharedWith(), $excludedGroups) || !$sharedWith->inGroup($sharedBy)) {
 				throw new \Exception('Sharing is only allowed within your own groups');
 			}
 		}
@@ -1940,6 +1948,22 @@ public function shareWithGroupMembersOnly() {
 		return $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
 	}
 
+	/**
+	 * If shareWithGroupMembersOnly is enabled, return an optional
+	 * list of groups that must be excluded from the principle of
+	 * belonging to the same group.
+	 *
+	 * @return array
+	 */
+	public function shareWithGroupMembersOnlyExcludedGroupsList() {
+		if (!$this->shareWithGroupMembersOnly()) {
+			return [];
+		}
+		$excludeGroups = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members_exclude_group_list', '');
+		$decodedExcludeGroups = json_decode($excludeGroups, true);
+		return $decodedExcludeGroups ?? [];
+	}
+
 	/**
 	 * Check if users can share with groups
 	 *

lib/public/Share/IManager.php

@@ -415,6 +415,15 @@ public function shareApiLinkAllowPublicUpload();
 	 */
 	public function shareWithGroupMembersOnly();
 
+	/**
+	 * If shareWithGroupMembersOnly is enabled, return an optional
+	 * list of groups that must be excluded from the principle of
+	 * belonging to the same group.
+	 * @return array
+	 * @since 27.0.0
+	 */
+	public function shareWithGroupMembersOnlyExcludedGroupsList();
+
 	/**
 	 * Check if users can share with groups
 	 * @return bool