Add file server instability modal

Session.xcodeproj/project.pbxproj

@@ -773,6 +773,7 @@
 		C3DB66CC260AF1F3001EFC55 /* OpenGroupAPIV2+ObjC.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3DB66CB260AF1F3001EFC55 /* OpenGroupAPIV2+ObjC.swift */; };
 		C3DFFAC623E96F0D0058DAF8 /* Sheet.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3DFFAC523E96F0D0058DAF8 /* Sheet.swift */; };
 		C3E5C2FA251DBABB0040DFFC /* EditClosedGroupVC.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3E5C2F9251DBABB0040DFFC /* EditClosedGroupVC.swift */; };
+		C3ECBBDB2654D4640081996B /* FileServerModal.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3ECBBDA2654D4640081996B /* FileServerModal.swift */; };
 		C3ECBF7B257056B700EA7FCE /* Threading.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3ECBF7A257056B700EA7FCE /* Threading.swift */; };
 		C3F0A530255C80BC007BE2A3 /* NoopNotificationsManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3F0A52F255C80BC007BE2A3 /* NoopNotificationsManager.swift */; };
 		D2179CFC16BB0B3A0006F3AB /* CoreTelephony.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D2179CFB16BB0B3A0006F3AB /* CoreTelephony.framework */; };
@@ -1762,6 +1763,7 @@
 		C3DFFAC523E96F0D0058DAF8 /* Sheet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Sheet.swift; sourceTree = "<group>"; };
 		C3E5C2F9251DBABB0040DFFC /* EditClosedGroupVC.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EditClosedGroupVC.swift; sourceTree = "<group>"; };
 		C3E7134E251C867C009649BB /* Sodium+Conversion.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Sodium+Conversion.swift"; sourceTree = "<group>"; };
+		C3ECBBDA2654D4640081996B /* FileServerModal.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FileServerModal.swift; sourceTree = "<group>"; };
 		C3ECBF7A257056B700EA7FCE /* Threading.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Threading.swift; sourceTree = "<group>"; };
 		C3F0A52F255C80BC007BE2A3 /* NoopNotificationsManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NoopNotificationsManager.swift; sourceTree = "<group>"; };
 		C3F0A5B2255C915C007BE2A3 /* en */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = en; path = en.lproj/Localizable.strings; sourceTree = "<group>"; };
@@ -2872,6 +2874,7 @@
 				B8A14D6F2589CE9000E70D57 /* KeyPairMigrationSuccessSheet.swift */,
 				B86BD08323399ACF000F5AE3 /* Modal.swift */,
 				C3DFFAC523E96F0D0058DAF8 /* Sheet.swift */,
+				C3ECBBDA2654D4640081996B /* FileServerModal.swift */,
 			);
 			path = "Sheets & Modals";
 			sourceTree = "<group>";
@@ -4888,6 +4891,7 @@
 				34D1F0521F7E8EA30066283D /* GiphyDownloader.swift in Sources */,
 				450DF2051E0D74AC003D14BE /* Platform.swift in Sources */,
 				4CC613362227A00400E21A3A /* ConversationSearch.swift in Sources */,
+				C3ECBBDB2654D4640081996B /* FileServerModal.swift in Sources */,
 				B82149B825D60393009C0F2A /* BlockedModal.swift in Sources */,
 				B82B408C239A068800A248E7 /* RegisterVC.swift in Sources */,
 				346129991FD1E4DA00532771 /* SignalApp.m in Sources */,

Session/Home/HomeVC.swift

@@ -164,6 +164,14 @@ final class HomeVC : BaseVC, UITableViewDataSource, UITableViewDelegate, NewConv
     override func viewDidAppear(_ animated: Bool) {
         super.viewDidAppear(animated)
         reload()
+        let userDefaults = UserDefaults.standard
+        if !userDefaults[.hasSeenFileServerInstabilityNotification] {
+            let fileServerModal = FileServerModal()
+            fileServerModal.modalPresentationStyle = .overFullScreen
+            fileServerModal.modalTransitionStyle = .crossDissolve
+            present(fileServerModal, animated: true, completion: nil)
+            userDefaults[.hasSeenFileServerInstabilityNotification] = true
+        }
     }
     
     deinit {

Session/Sheets & Modals/FileServerModal.swift

@@ -0,0 +1,44 @@
+
+final class FileServerModal : Modal {
+
+    override func populateContentView() {
+        // Title
+        let titleLabel = UILabel()
+        titleLabel.textColor = Colors.text
+        titleLabel.font = .boldSystemFont(ofSize: Values.largeFontSize)
+        titleLabel.text = "Session"
+        titleLabel.textAlignment = .center
+        // Message
+        let messageLabel = UILabel()
+        messageLabel.textColor = Colors.text
+        messageLabel.font = .systemFont(ofSize: Values.smallFontSize)
+        let message = "We're upgrading the way files are stored. File transfer may be unstable for the next 24-48 hours."
+        messageLabel.text = message
+        messageLabel.numberOfLines = 0
+        messageLabel.lineBreakMode = .byWordWrapping
+        messageLabel.textAlignment = .center
+        // OK button
+        let okButton = UIButton()
+        okButton.set(.height, to: Values.mediumButtonHeight)
+        okButton.layer.cornerRadius = Modal.buttonCornerRadius
+        okButton.backgroundColor = Colors.buttonBackground
+        okButton.titleLabel!.font = .systemFont(ofSize: Values.smallFontSize)
+        okButton.setTitleColor(Colors.text, for: UIControl.State.normal)
+        okButton.setTitle("OK", for: UIControl.State.normal)
+        okButton.addTarget(self, action: #selector(close), for: UIControl.Event.touchUpInside)
+        // Button stack view
+        let buttonStackView = UIStackView(arrangedSubviews: [ okButton ])
+        buttonStackView.axis = .horizontal
+        buttonStackView.spacing = Values.mediumSpacing
+        buttonStackView.distribution = .fillEqually
+        // Main stack view
+        let mainStackView = UIStackView(arrangedSubviews: [ titleLabel, messageLabel, buttonStackView ])
+        mainStackView.axis = .vertical
+        mainStackView.spacing = Values.largeSpacing
+        contentView.addSubview(mainStackView)
+        mainStackView.pin(.leading, to: .leading, of: contentView, withInset: Values.largeSpacing)
+        mainStackView.pin(.top, to: .top, of: contentView, withInset: Values.largeSpacing)
+        contentView.pin(.trailing, to: .trailing, of: mainStackView, withInset: Values.largeSpacing)
+        contentView.pin(.bottom, to: .bottom, of: mainStackView, withInset: Values.largeSpacing)
+    }
+}

SessionUtilitiesKit/General/SNUserDefaults.swift

@@ -8,6 +8,7 @@ public enum SNUserDefaults {
         case hasSeenLinkPreviewSuggestion
         case isUsingFullAPNs
         case isMigratingToV2KeyPair
+        case hasSeenFileServerInstabilityNotification
     }
 
     public enum Date : Swift.String {