Add user to delete ERC20 tokens

AlphaWallet.xcodeproj/project.pbxproj

@@ -334,6 +334,7 @@
 		5E7C776BE1B19F824954962D /* BaseTicketTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C7F5C10E3895E805EA7E0 /* BaseTicketTableViewCell.swift */; };
 		5E7C776CF721EBBD43195926 /* GenerateSellMagicLinkViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C79CF6150E4CD4A276FC0 /* GenerateSellMagicLinkViewController.swift */; };
 		5E7C7788984F7ADCFE5B4DE0 /* AddressTextField.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C75B5AF76279A71395FC7 /* AddressTextField.swift */; };
+		5E7C7788FA549A0402BB33CB /* HiddenContract.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C7C01F8C42D7A43792C26 /* HiddenContract.swift */; };
 		5E7C7793AB6B577906F2BCA3 /* SettingsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C7AFE9AF9FE6B58C925D4 /* SettingsViewController.swift */; };
 		5E7C77A8425E0AFAB11F1FCD /* PromptBackupCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C7ADD0FBE8708A6E98AF8 /* PromptBackupCoordinator.swift */; };
 		5E7C77AD9FAAC18211B6F355 /* TransferTicketsQuantitySelectionViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5E7C7419F47CC8B2996AA8F9 /* TransferTicketsQuantitySelectionViewController.swift */; };
@@ -889,6 +890,7 @@
 		5E7C7BA578BE5FB0E613A6D6 /* ChooseTicketTransferModeViewControllerViewModel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ChooseTicketTransferModeViewControllerViewModel.swift; sourceTree = "<group>"; };
 		5E7C7BD9B4BDAFC2D9EBD741 /* StatusViewControllerViewModel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StatusViewControllerViewModel.swift; sourceTree = "<group>"; };
 		5E7C7BF09AD68C113D58344C /* LocalesViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LocalesViewController.swift; sourceTree = "<group>"; };
+		5E7C7C01F8C42D7A43792C26 /* HiddenContract.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = HiddenContract.swift; sourceTree = "<group>"; };
 		5E7C7C077372C3F2A4349FA1 /* TokenViewCell.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TokenViewCell.swift; sourceTree = "<group>"; };
 		5E7C7C2872E213BBB05D55BA /* ImportWalletTabBarViewModel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ImportWalletTabBarViewModel.swift; sourceTree = "<group>"; };
 		5E7C7C58586099F082973073 /* WalletFilterView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = WalletFilterView.swift; sourceTree = "<group>"; };
@@ -1696,6 +1698,7 @@
 				5E7C74B82783A94091A43470 /* EthTokenViewCellViewModel.swift */,
 				5E7C7A16ABC8BD5D508AA641 /* ImportWalletHelpBubbleViewViewModel.swift */,
 				5E7C73DF5FBFE756097D32B1 /* EthCurrencyHelper.swift */,
+				5E7C7C01F8C42D7A43792C26 /* HiddenContract.swift */,
 			);
 			path = ViewModels;
 			sourceTree = "<group>";
@@ -3649,6 +3652,7 @@
 				5E7C7B348A4DB36FC2D39DDF /* AssetField.swift in Sources */,
 				76F1D74912F5D8CDA72363BD /* GetContractInteractions.swift in Sources */,
 				5E7C741353DDF87133054FCC /* DeletedContract.swift in Sources */,
+				5E7C7788FA549A0402BB33CB /* HiddenContract.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

AlphaWallet/Core/Initializers/MirgrationInitializer.swift

@@ -20,7 +20,7 @@ class MigrationInitializer: Initializer {
     }
 
     func perform() {
-        config.schemaVersion = 42
+        config.schemaVersion = 43
         config.migrationBlock = { migration, oldSchemaVersion in
             switch oldSchemaVersion {
             case 0...32:

AlphaWallet/Tokens/Coordinators/TokensCoordinator.swift

@@ -83,7 +83,8 @@ class TokensCoordinator: Coordinator {
             let detectedContracts = contracts.map { $0.lowercased() }
             let alreadyAddedContracts = self.storage.enabledObject.map { $0.address.eip55String.lowercased() }
             let deletedContracts = self.storage.deletedContracts.map { $0.contract.lowercased() }
-            let contractsToAdd = detectedContracts - alreadyAddedContracts - deletedContracts
+            let hiddenContracts = self.storage.hiddenContracts.map { $0.contract.lowercased() }
+            let contractsToAdd = detectedContracts - alreadyAddedContracts - deletedContracts - hiddenContracts
             var contractsPulled = 0
             var hasRefreshedAfterAddingAllContracts = false
             for eachContract in contractsToAdd {
@@ -285,6 +286,7 @@ extension TokensCoordinator: TokensViewControllerDelegate {
     }
 
     func didDelete(token: TokenObject, in viewController: UIViewController) {
+        storage.add(hiddenContracts: [HiddenContract(contract: token.contract)])
         storage.delete(tokens: [token])
         tokensViewController.fetch()
     }

AlphaWallet/Tokens/Types/TokensDataStore.swift

@@ -113,6 +113,10 @@ class TokensDataStore {
         return Array(realm.objects(DeletedContract.self))
     }
 
+    var hiddenContracts: [HiddenContract] {
+        return Array(realm.objects(HiddenContract.self))
+    }
+
     static func update(in realm: Realm, tokens: [Token]) {
         realm.beginWrite()
         for token in tokens {
@@ -292,6 +296,12 @@ class TokensDataStore {
         }
     }
 
+    func add(hiddenContracts: [HiddenContract]) {
+        try! realm.write {
+            realm.add(hiddenContracts, update: false)
+        }
+    }
+
     @discardableResult
     func add(tokens: [TokenObject]) -> [TokenObject] {
         realm.beginWrite()

AlphaWallet/Tokens/ViewModels/HiddenContract.swift

@@ -0,0 +1,13 @@
+// Copyright © 2018 Stormbird PTE. LTD.
+
+import Foundation
+import RealmSwift
+
+class HiddenContract: Object {
+    @objc dynamic var contract: String = ""
+
+    convenience init(contract: String) {
+        self.init()
+        self.contract = contract
+    }
+}

AlphaWallet/Tokens/ViewModels/TokensViewModel.swift

@@ -12,6 +12,7 @@ class TokensViewModel {
         }
     }
     var tickers: [String: CoinTicker]?
+    var etherTokenContract: String
     var filter: WalletFilter = .all
     var filteredTokens: [TokenObject] {
         switch filter {
@@ -87,11 +88,13 @@ class TokensViewModel {
 
     func canDelete(for row: Int, section: Int) -> Bool {
         let token = item(for: row, section: section)
-        if let ticketContractAddress = config.ticketContractAddress {
-            return token.isCustom && token.contract.lowercased() != ticketContractAddress.lowercased()
-        } else {
-            return token.isCustom
+        if etherTokenContract == token.contract {
+            return false
+        }
+        if let ticketContractAddress = config.ticketContractAddress, token.contract.lowercased() == ticketContractAddress.lowercased() {
+            return false
         }
+        return true
     }
 
     var footerTextColor: UIColor {
@@ -108,6 +111,7 @@ class TokensViewModel {
         tickers: [String: CoinTicker]?
     ) {
         self.config = config
+        self.etherTokenContract = TokensDataStore.etherToken(for: config).contract
         self.tokens = reorderTokensSoFIFAAtIndex1(tokens: tokens)
         self.tickers = tickers
     }