Randomizes featured source + app order at app launch

AltStore/Browse/FeaturedViewController.swift

@@ -312,7 +312,7 @@ private extension FeaturedViewController
         fetchRequest.returnsObjectsAsFaults = false
         fetchRequest.sortDescriptors = [
             // Sort by Source first to group into sections.
-            NSSortDescriptor(keyPath: \StoreApp.sourceIdentifier, ascending: true),
+            NSSortDescriptor(keyPath: \StoreApp._source?.featuredSortID, ascending: true),
             
             // Show uninstalled apps first.
             // Sorting by StoreApp.installedApp crashes because InstalledApp does not respond to compare:
@@ -324,8 +324,8 @@ private extension FeaturedViewController
             // Instead, sort by StoreApp.featuringSource.identifier, which will be either nil OR source ID.
             NSSortDescriptor(keyPath: \StoreApp.featuringSource?.identifier, ascending: false),
             
-            // Sort by name.
+            // Randomize order within sections.
-            NSSortDescriptor(keyPath: \StoreApp.name, ascending: true),
+            NSSortDescriptor(keyPath: \StoreApp.featuredSortID, ascending: true),
             
             // Sanity check to ensure stable ordering
             NSSortDescriptor(keyPath: \StoreApp.bundleIdentifier, ascending: true)
@@ -346,14 +346,14 @@ private extension FeaturedViewController
         let primaryFetchRequest = fetchRequest.copy() as! NSFetchRequest<StoreApp>
         primaryFetchRequest.predicate = sourceHasRemainingAppsPredicate
         
-        let primaryController = NSFetchedResultsController(fetchRequest: primaryFetchRequest, managedObjectContext: DatabaseManager.shared.viewContext, sectionNameKeyPath: #keyPath(StoreApp.sourceIdentifier), cacheName: nil)
+        let primaryController = NSFetchedResultsController(fetchRequest: primaryFetchRequest, managedObjectContext: DatabaseManager.shared.viewContext, sectionNameKeyPath: #keyPath(StoreApp._source.featuredSortID), cacheName: nil)
         let primaryDataSource = RSTFetchedResultsCollectionViewDataSource<StoreApp>(fetchedResultsController: primaryController)
         primaryDataSource.liveFetchLimit = 5
         
         let secondaryFetchRequest = fetchRequest.copy() as! NSFetchRequest<StoreApp>
         secondaryFetchRequest.predicate = NSCompoundPredicate(notPredicateWithSubpredicate: sourceHasRemainingAppsPredicate)
         
-        let secondaryController = NSFetchedResultsController(fetchRequest: secondaryFetchRequest, managedObjectContext: DatabaseManager.shared.viewContext, sectionNameKeyPath: #keyPath(StoreApp.sourceIdentifier), cacheName: nil)
+        let secondaryController = NSFetchedResultsController(fetchRequest: secondaryFetchRequest, managedObjectContext: DatabaseManager.shared.viewContext, sectionNameKeyPath: #keyPath(StoreApp._source.featuredSortID), cacheName: nil)
         let secondaryDataSource = RSTFetchedResultsCollectionViewDataSource<StoreApp>(fetchedResultsController: secondaryController)
         secondaryDataSource.liveFetchLimit = 5
         

AltStoreCore/Model/AltStore.xcdatamodeld/AltStore 14.xcdatamodel/contents

@@ -217,6 +217,7 @@
     </entity>
     <entity name="Source" representedClassName="Source" syncable="YES">
         <attribute name="error" optional="YES" attributeType="Transformable" valueTransformerName="ALTSecureValueTransformer"/>
+        <attribute name="featuredSortID" optional="YES" attributeType="String"/>
         <attribute name="hasFeaturedApps" attributeType="Boolean" defaultValueString="NO" usesScalarValueType="YES"/>
         <attribute name="headerImageURL" optional="YES" attributeType="URI"/>
         <attribute name="iconURL" optional="YES" attributeType="URI"/>
@@ -242,6 +243,7 @@
         <attribute name="category" optional="YES" attributeType="String"/>
         <attribute name="developerName" attributeType="String"/>
         <attribute name="downloadURL" attributeType="URI"/>
+        <attribute name="featuredSortID" optional="YES" attributeType="String"/>
         <attribute name="iconURL" attributeType="URI"/>
         <attribute name="isBeta" attributeType="Boolean" defaultValueString="NO" usesScalarValueType="YES"/>
         <attribute name="isHiddenWithoutPledge" attributeType="Boolean" defaultValueString="NO" usesScalarValueType="YES"/>

AltStoreCore/Model/DatabaseManager.swift

@@ -178,6 +178,49 @@ public extension DatabaseManager
             }
         }
     }
+    
+    func updateFeaturedSortIDs() async
+    {
+        let context = DatabaseManager.shared.persistentContainer.newBackgroundContext()
+        context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy // DON'T use our custom merge policy, because that one ignores changes to featuredSortID.
+        await context.performAsync {
+            do
+            {
+                // Randomize source order
+                let fetchRequest = Source.fetchRequest()
+                let sources = try context.fetch(fetchRequest)
+                
+                for source in sources
+                {
+                    source.featuredSortID = UUID().uuidString
+                }
+                
+                try context.save()
+            }
+            catch
+            {
+                Logger.main.error("Failed to update source order. \(error.localizedDescription, privacy: .public)")
+            }
+            
+            do
+            {
+                // Randomize app order
+                let fetchRequest = StoreApp.fetchRequest()
+                let apps = try context.fetch(fetchRequest)
+                
+                for app in apps
+                {
+                    app.featuredSortID = UUID().uuidString
+                }
+                
+                try context.save()
+            }
+            catch
+            {
+                Logger.main.error("Failed to update app order. \(error.localizedDescription, privacy: .public)")
+            }
+        }
+    }
 }
 
 public extension DatabaseManager
@@ -372,8 +415,12 @@ private extension DatabaseManager
             do
             {
                 try context.save()
+                
+                Task(priority: .high) {
+                    await self.updateFeaturedSortIDs()
                     completionHandler(.success(()))
                 }
+            }
             catch
             {
                 completionHandler(.failure(error))

AltStoreCore/Model/MergePolicy.swift

@@ -234,6 +234,12 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                     sortedScreenshotIDsByGlobalAppID[globallyUniqueID] = contextScreenshotIDs
                 }
                 
+                // Revert contextApp.featuredSortID to database value (if it exists).
+                if let featuredSortID = databaseObject.featuredSortID
+                {
+                    contextApp.featuredSortID = featuredSortID
+                }
+                
             case let databaseObject as Source:
                 guard let conflictedObject = conflict.conflictingObjects.first as? Source else { break }
                 
@@ -263,6 +269,12 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                     featuredAppIDsBySourceID[databaseObject.identifier] = contextSource.featuredApps?.map { $0.bundleIdentifier }
                 }
                 
+                // Revert conflictedObject.featuredSortID to database value (if it exists).
+                if let featuredSortID = databaseObject.featuredSortID
+                {
+                    conflictedObject.featuredSortID = featuredSortID
+                }
+                
             case let databasePledge as Pledge:
                 guard let contextPledge = conflict.conflictingObjects.first as? Pledge else { break }
                 

AltStoreCore/Model/Source.swift

@@ -215,6 +215,8 @@ public class Source: NSManagedObject, Fetchable, Decodable
     
     @NSManaged public var error: NSError?
     
+    @NSManaged public var featuredSortID: String?
+    
     /* Non-Core Data Properties */
     public var userInfo: [ALTSourceUserInfoKey: String]?
     
@@ -350,6 +352,13 @@ public class Source: NSManagedObject, Fetchable, Decodable
             throw error
         }
     }
+    
+    public override func awakeFromInsert()
+    {
+        super.awakeFromInsert()
+        
+        self.featuredSortID = UUID().uuidString
+    }
 }
 
 public extension Source

AltStoreCore/Model/StoreApp.swift

@@ -141,6 +141,7 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
     @NSManaged @objc(pledgeAmount) private var _pledgeAmount: NSDecimalNumber?
     
     @NSManaged public var sortIndex: Int32
+    @NSManaged public var featuredSortID: String?
     
     @objc public internal(set) var sourceIdentifier: String? {
         get {
@@ -463,6 +464,13 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
             throw error
         }
     }
+    
+    public override func awakeFromInsert()
+    {
+        super.awakeFromInsert()
+        
+        self.featuredSortID = UUID().uuidString
+    }
 }
 
 internal extension StoreApp