[AltStoreCore] Adds AppScreenshot to support dynamically-sized screenshots

Preserves StoreApp.imageURL field in database model for backwards compatibility.

AltStore.xcodeproj/project.pbxproj

@@ -435,6 +435,7 @@
 		D5F48B4C29CD0C48002B52A4 /* AsyncManaged.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5F48B4929CD0B67002B52A4 /* AsyncManaged.swift */; };
 		D5F5AF2E28FDD2EC00C938F5 /* TestErrors.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5F5AF2D28FDD2EC00C938F5 /* TestErrors.swift */; };
 		D5F5AF7D28ECEA990067C736 /* ErrorDetailsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5F5AF7C28ECEA990067C736 /* ErrorDetailsViewController.swift */; };
+		D5F9821D2AB900060045751F /* AppScreenshot.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5F9821C2AB900060045751F /* AppScreenshot.swift */; };
 		D5F99A1828D11DB500476A16 /* AltStore10ToAltStore11.xcmappingmodel in Sources */ = {isa = PBXBuildFile; fileRef = D5F99A1728D11DB500476A16 /* AltStore10ToAltStore11.xcmappingmodel */; };
 		D5F99A1A28D12B1400476A16 /* StoreApp10ToStoreApp11Policy.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5F99A1928D12B1400476A16 /* StoreApp10ToStoreApp11Policy.swift */; };
 		D5FB28EC2ADDF68D00A1C337 /* UIFontDescriptor+Bold.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5FB28EB2ADDF68D00A1C337 /* UIFontDescriptor+Bold.swift */; };
@@ -1096,6 +1097,7 @@
 		D5F48B4929CD0B67002B52A4 /* AsyncManaged.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AsyncManaged.swift; sourceTree = "<group>"; };
 		D5F5AF2D28FDD2EC00C938F5 /* TestErrors.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestErrors.swift; sourceTree = "<group>"; };
 		D5F5AF7C28ECEA990067C736 /* ErrorDetailsViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ErrorDetailsViewController.swift; sourceTree = "<group>"; };
+		D5F9821C2AB900060045751F /* AppScreenshot.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppScreenshot.swift; sourceTree = "<group>"; };
 		D5F99A1728D11DB500476A16 /* AltStore10ToAltStore11.xcmappingmodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcmappingmodel; path = AltStore10ToAltStore11.xcmappingmodel; sourceTree = "<group>"; };
 		D5F99A1928D12B1400476A16 /* StoreApp10ToStoreApp11Policy.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StoreApp10ToStoreApp11Policy.swift; sourceTree = "<group>"; };
 		D5FB28EB2ADDF68D00A1C337 /* UIFontDescriptor+Bold.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIFontDescriptor+Bold.swift"; sourceTree = "<group>"; };
@@ -1666,6 +1668,7 @@
 				BF66EEC92501AECA007EE018 /* Account.swift */,
 				BF66EEC72501AECA007EE018 /* AppID.swift */,
 				BF66EEC62501AECA007EE018 /* AppPermission.swift */,
+				D5F9821C2AB900060045751F /* AppScreenshot.swift */,
 				D52C08ED28AEC37A006C4AE5 /* AppVersion.swift */,
 				BF66EECA2501AECA007EE018 /* DatabaseManager.swift */,
 				D5FD4ECA2A9532960097BEE8 /* DatabaseManager+Async.swift */,
@@ -3056,6 +3059,7 @@
 				BF66EEE82501AED0007EE018 /* UserDefaults+AltStore.swift in Sources */,
 				BF340E9A250AD39500A192CB /* ViewApp.intentdefinition in Sources */,
 				BFAECC522501B0A400528F27 /* CodableError.swift in Sources */,
+				D5F9821D2AB900060045751F /* AppScreenshot.swift in Sources */,
 				BF66EE9E2501AEC1007EE018 /* Fetchable.swift in Sources */,
 				BF66EEDF2501AECA007EE018 /* PatreonAccount.swift in Sources */,
 				BFAECC532501B0A400528F27 /* ServerProtocol.swift in Sources */,

AltStoreCore/Model/AltStore.xcdatamodeld/AltStore 13.xcdatamodel/contents

@@ -42,6 +42,21 @@
             </uniquenessConstraint>
         </uniquenessConstraints>
     </entity>
+    <entity name="AppScreenshot" representedClassName="AppScreenshot" syncable="YES">
+        <attribute name="appBundleID" attributeType="String"/>
+        <attribute name="height" optional="YES" attributeType="Integer 16" usesScalarValueType="NO"/>
+        <attribute name="imageURL" attributeType="URI"/>
+        <attribute name="sourceID" attributeType="String"/>
+        <attribute name="width" optional="YES" attributeType="Integer 16" usesScalarValueType="NO"/>
+        <relationship name="app" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="StoreApp" inverseName="screenshots" inverseEntity="StoreApp"/>
+        <uniquenessConstraints>
+            <uniquenessConstraint>
+                <constraint value="imageURL"/>
+                <constraint value="appBundleID"/>
+                <constraint value="sourceID"/>
+            </uniquenessConstraint>
+        </uniquenessConstraints>
+    </entity>
     <entity name="AppVersion" representedClassName="AppVersion" syncable="YES">
         <attribute name="appBundleID" attributeType="String"/>
         <attribute name="buildVersion" attributeType="String"/>
@@ -207,6 +222,7 @@
         <relationship name="loggedErrors" toMany="YES" deletionRule="Nullify" destinationEntity="LoggedError" inverseName="storeApp" inverseEntity="LoggedError"/>
         <relationship name="newsItems" toMany="YES" deletionRule="Nullify" destinationEntity="NewsItem" inverseName="storeApp" inverseEntity="NewsItem"/>
         <relationship name="permissions" toMany="YES" deletionRule="Cascade" destinationEntity="AppPermission" inverseName="app" inverseEntity="AppPermission"/>
+        <relationship name="screenshots" toMany="YES" deletionRule="Cascade" ordered="YES" destinationEntity="AppScreenshot" inverseName="app" inverseEntity="AppScreenshot"/>
         <relationship name="source" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Source" inverseName="apps" inverseEntity="Source"/>
         <relationship name="versions" toMany="YES" deletionRule="Cascade" ordered="YES" destinationEntity="AppVersion" inverseName="app" inverseEntity="AppVersion"/>
         <uniquenessConstraints>

AltStoreCore/Model/AppScreenshot.swift

@@ -0,0 +1,85 @@
+//
+//  AppScreenshot.swift
+//  AltStoreCore
+//
+//  Created by Riley Testut on 9/18/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import CoreData
+
+@objc(AppScreenshot)
+public class AppScreenshot: NSManagedObject, Fetchable, Decodable
+{
+    /* Properties */
+    @NSManaged public private(set) var imageURL: URL
+    
+    public private(set) var size: CGSize? {
+        get {
+            guard let width = self.width?.doubleValue, let height = self.height?.doubleValue else { return nil }
+            return CGSize(width: width, height: height)
+        }
+        set {
+            if let newValue
+            {
+                self.width = NSNumber(value: newValue.width)
+                self.height = NSNumber(value: newValue.height)
+            }
+            else
+            {
+                self.width = nil
+                self.height = nil
+            }
+        }
+    }
+    @NSManaged private var width: NSNumber?
+    @NSManaged private var height: NSNumber?
+    
+    @NSManaged public internal(set) var appBundleID: String
+    @NSManaged public internal(set) var sourceID: String
+    
+    /* Relationships */
+    @NSManaged public internal(set) var app: StoreApp?
+    
+    private enum CodingKeys: String, CodingKey
+    {
+        case imageURL
+        case width
+        case height
+    }
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    internal init(imageURL: URL, size: CGSize?, context: NSManagedObjectContext)
+    {
+        super.init(entity: AppScreenshot.entity(), insertInto: context)
+        
+        self.imageURL = imageURL
+        self.size = size
+    }
+    
+    public required init(from decoder: Decoder) throws
+    {
+        guard let context = decoder.managedObjectContext else { preconditionFailure("Decoder must have non-nil NSManagedObjectContext.") }
+        
+        super.init(entity: AppScreenshot.entity(), insertInto: context)
+        
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        
+        self.imageURL = try container.decode(URL.self, forKey: .imageURL)
+        
+        self.width = try container.decodeIfPresent(Int16.self, forKey: .width).map { NSNumber(value: $0) }
+        self.height = try container.decodeIfPresent(Int16.self, forKey: .height).map { NSNumber(value: $0) }
+    }
+}
+
+public extension AppScreenshot
+{
+    @nonobjc class func fetchRequest() -> NSFetchRequest<AppScreenshot>
+    {
+        return NSFetchRequest<AppScreenshot>(entityName: "AppScreenshot")
+    }
+}

AltStoreCore/Model/MergePolicy.swift

@@ -156,6 +156,12 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                         {
                             appVersion.managedObjectContext?.delete(appVersion)
                         }
+                        
+                        // Delete previous screenshots (different than below).
+                        for case let appScreenshot as AppScreenshot in previousApp._screenshots where appScreenshot.app == nil
+                        {
+                            appScreenshot.managedObjectContext?.delete(appScreenshot)
+                        }
                     }
                     
                 case is AppVersion where conflict.conflictingObjects.count == 2:
@@ -181,8 +187,9 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
             return
         }
         
-        var sortedVersionIDsByGlobalAppID = [String: NSOrderedSet]()
         var permissionsByGlobalAppID = [String: Set<AnyHashable>]()
+        var sortedVersionIDsByGlobalAppID = [String: NSOrderedSet]()
+        var sortedScreenshotURLsByGlobalAppID = [String: NSOrderedSet]()
         
         var featuredAppIDsBySourceID = [String: [String]]()
         
@@ -212,10 +219,19 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                     databaseVersion.managedObjectContext?.delete(databaseVersion)
                 }
                 
+                // Screenshots
+                let contextScreenshotURLs = NSOrderedSet(array: contextApp._screenshots.lazy.compactMap { $0 as? AppScreenshot }.map { $0.imageURL })
+                for case let databaseScreenshot as AppScreenshot in databaseObject._screenshots where !contextScreenshotURLs.contains(databaseScreenshot.imageURL)
+                {
+                    // Screenshot's imageURL does NOT exist in context, so delete existing databaseScreenshot.
+                    databaseScreenshot.managedObjectContext?.delete(databaseScreenshot)
+                }
+                
                 if let globallyUniqueID = contextApp.globallyUniqueID
                 {
                     permissionsByGlobalAppID[globallyUniqueID] = contextPermissions
                     sortedVersionIDsByGlobalAppID[globallyUniqueID] = contextVersionIDs
+                    sortedScreenshotURLsByGlobalAppID[globallyUniqueID] = contextScreenshotURLs
                 }
                 
             case let databaseObject as Source:
@@ -295,6 +311,31 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                             
                             appVersions = fixedAppVersions
                         }
+                        
+                        // Screenshots
+                        if let sortedScreenshotURLs = sortedScreenshotURLsByGlobalAppID[globallyUniqueID],
+                           let sortedScreenshotURLsArray = sortedScreenshotURLs.array as? [URL],
+                           case let databaseScreenshotURLs = databaseObject.screenshots.map({ $0.imageURL }),
+                           databaseScreenshotURLs != sortedScreenshotURLsArray
+                        {
+                            // Screenshot order is incorrect, so attempt to fix by re-sorting.
+                            let fixedScreenshots = databaseObject.screenshots.sorted { (screenshotA, screenshotB) in
+                                let indexA = sortedScreenshotURLs.index(of: screenshotA.imageURL)
+                                let indexB = sortedScreenshotURLs.index(of: screenshotB.imageURL)
+                                return indexA < indexB
+                            }
+                            
+                            let appScreenshotURLs = fixedScreenshots.map { $0.imageURL }
+                            if appScreenshotURLs == sortedScreenshotURLsArray
+                            {
+                                databaseObject.setScreenshots(fixedScreenshots)
+                            }
+                            else
+                            {
+                                // Screenshots are still not in correct order, but not worth throwing error so ignore.
+                                print("Failed to re-sort screenshots into correct order. Expected:", sortedScreenshotURLsArray)
+                            }
+                        }
                     }
                     
                     // Always update versions post-merging to make sure latestSupportedVersion is correct.

AltStoreCore/Model/StoreApp.swift

@@ -136,6 +136,11 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
             {
                 permission.sourceID = self.sourceIdentifier ?? ""
             }
+            
+            for screenshot in self.screenshots
+            {
+                screenshot.sourceID = self.sourceIdentifier ?? ""
+            }
         }
     }
     @NSManaged private var primitiveSourceIdentifier: String?
@@ -200,6 +205,10 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
         guard let version = self.latestSupportedVersion else { return nil }
         return version.downloadURL
     }
+    @nonobjc public var screenshots: [AppScreenshot] {
+        return self._screenshots.array as! [AppScreenshot]
+    }
+    @NSManaged @objc(screenshots) private(set) var _screenshots: NSOrderedSet
     
     private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
     {
@@ -212,19 +221,24 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
         case bundleIdentifier
         case developerName
         case localizedDescription
-        case version
-        case versionDescription
-        case versionDate
         case iconURL
         case screenshotURLs
         case downloadURL
         case platformURLs
+        case screenshots
         case tintColor
         case subtitle
         case permissions = "appPermissions"
         case size
         case isBeta = "beta"
         case versions
+        
+        // Legacy
+        case version
+        case versionDescription
+        case versionDate
+        case downloadURL
+        case screenshotURLs
     }
     
     public required init(from decoder: Decoder) throws
@@ -245,7 +259,6 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
             self.subtitle = try container.decodeIfPresent(String.self, forKey: .subtitle)
             
             self.iconURL = try container.decode(URL.self, forKey: .iconURL)
-            self.screenshotURLs = try container.decodeIfPresent([URL].self, forKey: .screenshotURLs) ?? []
             
             var downloadURL = try container.decodeIfPresent(URL.self, forKey: .downloadURL)
             let platformURLs = try container.decodeIfPresent(PlatformURLs.self.self, forKey: .platformURLs)
@@ -291,6 +304,33 @@ public class StoreApp: NSManagedObject, Decodable, Fetchable
             
             self.isBeta = try container.decodeIfPresent(Bool.self, forKey: .isBeta) ?? false
             
+            if let screenshots = try container.decodeIfPresent([AppScreenshot].self, forKey: .screenshots)
+            {
+                for screenshot in screenshots
+                {
+                    screenshot.appBundleID = self.bundleIdentifier
+                }
+                
+                self.setScreenshots(screenshots)
+            }
+            else if let screenshotURLs = try container.decodeIfPresent([URL].self, forKey: .screenshotURLs)
+            {
+                // Assume 9:16 iPhone 8 screen dimensions for legacy screenshotURLs.
+                let legacyAspectRatio = CGSize(width: 750, height: 1334)
+                
+                let screenshots = screenshotURLs.map { imageURL in
+                    let screenshot = AppScreenshot(imageURL: imageURL, size: legacyAspectRatio, context: context)
+                    screenshot.appBundleID = self.bundleIdentifier
+                    return screenshot
+                }
+                
+                self.setScreenshots(screenshots)
+            }
+            else
+            {
+                self.setScreenshots([])
+            }
+            
             if let appPermissions = try container.decodeIfPresent(AppPermissions.self, forKey: .permissions)
             {
                 let allPermissions = appPermissions.entitlements + appPermissions.privacy
@@ -402,6 +442,26 @@ internal extension StoreApp
         
         self._permissions = permissions as NSSet
     }
+    
+    func setScreenshots(_ screenshots: [AppScreenshot])
+    {
+        for case let screenshot as AppScreenshot in self._screenshots
+        {
+            if screenshots.contains(screenshot)
+            {
+                screenshot.app = self
+            }
+            else
+            {
+                screenshot.app = nil
+            }
+        }
+        
+        self._screenshots = NSOrderedSet(array: screenshots)
+        
+        // Backwards compatibility
+        self.screenshotURLs = screenshots.map { $0.imageURL }
+    }
 }
 
 public extension StoreApp