[web] Enforce collaborator limit (#19619)

* Enables collaborator limit enforcement

* Add pendingEditor_refs for editors downgraded during limit enforcement

* Add isPendingEditor to useEditorContext

---------

Co-authored-by: Thomas Mees <thomas.mees@overleaf.com>
GitOrigin-RevId: b622213f6282ccd8ee85a23ceb29b8c6f8ff6a96

services/web/app/src/Features/Project/ProjectController.js

@@ -415,6 +415,7 @@ const _ProjectController = {
           tokens: 1,
           tokenAccessReadAndWrite_refs: 1, // used for link sharing analytics
           collaberator_refs: 1, // used for link sharing analytics
+          pendingEditor_refs: 1, // used for link sharing analytics
         }),
         userIsMemberOfGroupSubscription: sessionUser
           ? (async () =>
@@ -488,12 +489,24 @@ const _ProjectController = {
           anonRequestToken
         )
 
-      const linkSharingChanges =
-        await SplitTestHandler.promises.getAssignmentForUser(
+      const [linkSharingChanges, linkSharingEnforcement] = await Promise.all([
+        SplitTestHandler.promises.getAssignmentForUser(
           project.owner_ref,
           'link-sharing-warning'
-        )
+        ),
+        SplitTestHandler.promises.getAssignmentForUser(
+          project.owner_ref,
+          'link-sharing-enforcement'
+        ),
+      ])
+
       if (linkSharingChanges?.variant === 'active') {
+        if (linkSharingEnforcement?.variant === 'active') {
+          await Modules.promises.hooks.fire(
+            'enforceCollaboratorLimit',
+            projectId
+          )
+        }
         if (isTokenMember) {
           // Check explicitly that the user is in read write token refs, while this could be inferred
           // from the privilege level, the privilege level of token members might later be restricted
@@ -570,12 +583,14 @@ const _ProjectController = {
         )
         const planLimit = ownerFeatures?.collaborators || 0
         const namedEditors = project.collaberator_refs?.length || 0
+        const pendingEditors = project.pendingEditor_refs?.length || 0
         const exceedAtLimit = planLimit > -1 && namedEditors >= planLimit
         const projectOpenedSegmentation = {
           projectId: project._id,
           // temporary link sharing segmentation:
           linkSharingWarning: linkSharingChanges?.variant,
           namedEditors,
+          pendingEditors,
           tokenEditors: project.tokenAccessReadAndWrite_refs?.length || 0,
           planLimit,
           exceedAtLimit,
@@ -1034,7 +1049,6 @@ const ProjectController = {
   ),
   updateProjectSettings: expressify(_ProjectController.updateProjectSettings),
   userProjectsJson: expressify(_ProjectController.userProjectsJson),
-
   _buildProjectList: _ProjectController._buildProjectList,
   _buildProjectViewModel: _ProjectController._buildProjectViewModel,
   _injectProjectUsers: _ProjectController._injectProjectUsers,