[AltStore] Refactors fetch apps logic to use Source model objects

AltStore/Model/AltStore.xcdatamodeld/AltStore.xcdatamodel/contents

@@ -22,6 +22,7 @@
         <attribute name="name" attributeType="String" syncable="YES"/>
         <attribute name="screenshotNames" attributeType="Transformable" syncable="YES"/>
         <attribute name="size" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
+        <attribute name="sortIndex" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
         <attribute name="subtitle" optional="YES" attributeType="String" syncable="YES"/>
         <attribute name="tintColor" optional="YES" attributeType="Transformable" syncable="YES"/>
         <attribute name="version" attributeType="String" syncable="YES"/>
@@ -29,6 +30,7 @@
         <attribute name="versionDescription" optional="YES" attributeType="String" syncable="YES"/>
         <relationship name="installedApp" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="InstalledApp" inverseName="storeApp" inverseEntity="InstalledApp" syncable="YES"/>
         <relationship name="permissions" toMany="YES" deletionRule="Cascade" ordered="YES" destinationEntity="AppPermission" inverseName="app" inverseEntity="AppPermission" syncable="YES"/>
+        <relationship name="source" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Source" inverseName="apps" inverseEntity="Source" syncable="YES"/>
         <uniquenessConstraints>
             <uniquenessConstraint>
                 <constraint value="bundleIdentifier"/>
@@ -54,6 +56,17 @@
             </uniquenessConstraint>
         </uniquenessConstraints>
     </entity>
+    <entity name="Source" representedClassName="Source" syncable="YES">
+        <attribute name="identifier" attributeType="String" syncable="YES"/>
+        <attribute name="name" attributeType="String" syncable="YES"/>
+        <attribute name="sourceURL" attributeType="URI" syncable="YES"/>
+        <relationship name="apps" toMany="YES" deletionRule="Nullify" ordered="YES" destinationEntity="App" inverseName="source" inverseEntity="App" syncable="YES"/>
+        <uniquenessConstraints>
+            <uniquenessConstraint>
+                <constraint value="identifier"/>
+            </uniquenessConstraint>
+        </uniquenessConstraints>
+    </entity>
     <entity name="Team" representedClassName="Team" syncable="YES">
         <attribute name="identifier" attributeType="String" syncable="YES"/>
         <attribute name="isActiveTeam" attributeType="Boolean" defaultValueString="NO" usesScalarValueType="YES" syncable="YES"/>
@@ -68,9 +81,10 @@
     </entity>
     <elements>
         <element name="Account" positionX="-36" positionY="90" width="128" height="135"/>
-        <element name="App" positionX="-63" positionY="-18" width="128" height="270"/>
+        <element name="App" positionX="-63" positionY="-18" width="128" height="300"/>
         <element name="AppPermission" positionX="-45" positionY="90" width="128" height="90"/>
         <element name="InstalledApp" positionX="-63" positionY="0" width="128" height="150"/>
         <element name="Team" positionX="-45" positionY="81" width="128" height="120"/>
+        <element name="Source" positionX="-45" positionY="99" width="128" height="105"/>
     </elements>
 </model>

AltStore/Model/App.swift

@@ -39,8 +39,11 @@ class App: NSManagedObject, Decodable, Fetchable
     @NSManaged private(set) var downloadURL: URL
     @NSManaged private(set) var tintColor: UIColor?
     
+    @NSManaged var sortIndex: Int32
+    
     /* Relationships */
     @NSManaged var installedApp: InstalledApp?
+    @NSManaged var source: Source?
     @objc(permissions) @NSManaged var _permissions: NSOrderedSet
     
     @nonobjc var permissions: [AppPermission] {

AltStore/Model/DatabaseManager.swift

@@ -118,8 +118,11 @@ private extension DatabaseManager
             }
             else
             {
+                let source = Source.makeAltStoreSource(in: context)
+                
                 storeApp = App.makeAltStoreApp(in: context)
                 storeApp.version = localApp.version
+                storeApp.source = source
             }
             
             let installedApp: InstalledApp

AltStore/Model/MergePolicy.swift

@@ -30,6 +30,20 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                     permission.managedObjectContext?.delete(permission)
                 }
                 
+            case let databaseObject as Source:
+                guard let conflictedObject = conflict.conflictingObjects.first as? Source else { break }
+
+                let bundleIdentifiers = Set(conflictedObject.apps.map { $0.bundleIdentifier })
+
+                for app in databaseObject.apps
+                {
+                    if !bundleIdentifiers.contains(app.bundleIdentifier)
+                    {
+                        // No longer listed in Source, so remove it from database.
+                        app.managedObjectContext?.delete(app)
+                    }
+                }
+                
             default: break
             }
         }

AltStore/Model/Source.swift

@@ -0,0 +1,92 @@
+//
+//  Source.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/30/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import CoreData
+
+extension Source
+{
+    static let altStoreIdentifier = "com.rileytestut.AltStore"
+}
+
+@objc(Source)
+class Source: NSManagedObject, Fetchable, Decodable
+{
+    /* Properties */
+    @NSManaged var name: String
+    @NSManaged var identifier: String
+    @NSManaged var sourceURL: URL
+    
+    /* Relationships */
+    @objc(apps) @NSManaged private(set) var _apps: NSOrderedSet
+    
+    @nonobjc var apps: [App] {
+        get {
+            return self._apps.array as! [App]
+        }
+        set {
+            self._apps = NSOrderedSet(array: newValue)
+        }
+    }
+    
+    private enum CodingKeys: String, CodingKey
+    {
+        case name
+        case identifier
+        case sourceURL
+        case apps
+    }
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    required init(from decoder: Decoder) throws
+    {
+        guard let context = decoder.managedObjectContext else { preconditionFailure("Decoder must have non-nil NSManagedObjectContext.") }
+        
+        super.init(entity: Source.entity(), insertInto: nil)
+        
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        self.name = try container.decode(String.self, forKey: .name)
+        self.identifier = try container.decode(String.self, forKey: .identifier)
+        self.sourceURL = try container.decode(URL.self, forKey: .sourceURL)
+        
+        let apps = try container.decodeIfPresent([App].self, forKey: .apps) ?? []
+        for (index, app) in apps.enumerated()
+        {
+            app.sortIndex = Int32(index)
+        }
+        
+        context.insert(self)
+        
+        // Must assign after we're inserted into context.
+        self._apps = NSMutableOrderedSet(array: apps)
+        
+        print("Downloaded Order:", self.apps.map { $0.bundleIdentifier })
+    }
+}
+
+extension Source
+{
+    class func makeAltStoreSource(in context: NSManagedObjectContext) -> Source
+    {
+        let source = Source(context: context)
+        source.name = "AltStore"
+        source.identifier = Source.altStoreIdentifier
+        source.sourceURL = URL(string: "https://www.dropbox.com/s/6qi1vt6hsi88lv6/Apps-Dev.json?dl=1")!
+        
+        return source
+    }
+    
+    class func fetchAltStoreSource(in context: NSManagedObjectContext) -> Source?
+    {
+        let source = Source.first(satisfying: NSPredicate(format: "%K == %@", #keyPath(Source.identifier), Source.altStoreIdentifier), in: context)
+        return source
+    }
+}