Hook up suggestion grid

Session/Home/HomeVC.swift

@@ -153,6 +153,8 @@ final class HomeVC : BaseVC, UITableViewDataSource, UITableViewDelegate, NewConv
         DispatchQueue.global(qos: .utility).async {
             let _ = IP2Country.shared.populateCacheIfNeeded()
         }
+        // Get default open group rooms if needed
+        OpenGroupAPIV2.getDefaultRoomsIfNeeded()
     }
     
     override func viewDidAppear(_ animated: Bool) {

Session/Meta/AppDelegate.m

@@ -396,7 +396,7 @@ static NSTimeInterval launchStartedAt;
             [self startClosedGroupPollerIfNeeded];
             [self startOpenGroupPollersIfNeeded];
 
-            // Loki: Update profile picture if needed
+            // Update profile picture if needed
             NSUserDefaults *userDefaults = NSUserDefaults.standardUserDefaults;
             NSDate *now = [NSDate new];
             NSDate *lastProfilePictureUpload = (NSDate *)[userDefaults objectForKey:@"lastProfilePictureUpload"];
@@ -411,6 +411,10 @@ static NSTimeInterval launchStartedAt;
                 } requiresSync:YES];
             }
             
+            if (CurrentAppContext().isMainApp) {
+                [SNOpenGroupAPIV2 getDefaultRoomsIfNeeded];
+            }
+
             if (![UIApplication sharedApplication].isRegisteredForRemoteNotifications) {
                 OWSLogInfo(@"Retrying remote notification registration since user hasn't registered yet.");
                 // Push tokens don't normally change while the app is launched, so checking once during launch is

Session/Open Groups/JoinOpenGroupVC.swift

@@ -149,6 +149,28 @@ final class JoinOpenGroupVC : BaseVC, UIPageViewControllerDataSource, UIPageView
         }
     }
     
+    fileprivate func join(_ room: String, on server: String, with publicKey: String) {
+        guard !isJoining else { return }
+        isJoining = true
+        ModalActivityIndicatorViewController.present(fromViewController: navigationController!, canCancel: false) { [weak self] _ in
+            Storage.shared.write { transaction in
+                OpenGroupManagerV2.shared.add(room: room, server: server, publicKey: publicKey, using: transaction)
+                .done(on: DispatchQueue.main) { [weak self] _ in
+                    self?.presentingViewController!.dismiss(animated: true, completion: nil)
+                    let appDelegate = UIApplication.shared.delegate as! AppDelegate
+                    appDelegate.forceSyncConfigurationNowIfNeeded().retainUntilComplete() // FIXME: It's probably cleaner to do this inside addOpenGroup(...)
+                }
+                .catch(on: DispatchQueue.main) { [weak self] error in
+                    self?.dismiss(animated: true, completion: nil) // Dismiss the loader
+                    let title = "Couldn't Join"
+                    let message = error.localizedDescription
+                    self?.isJoining = false
+                    self?.showError(title: title, message: message)
+                }
+            }
+        }
+    }
+    
     // MARK: Convenience
     private func showError(title: String, message: String = "") {
         let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
@@ -157,7 +179,7 @@ final class JoinOpenGroupVC : BaseVC, UIPageViewControllerDataSource, UIPageView
     }
 }
 
-private final class EnterURLVC : UIViewController {
+private final class EnterURLVC : UIViewController, OpenGroupSuggestionGridDelegate {
     weak var joinOpenGroupVC: JoinOpenGroupVC!
     
     // MARK: Components
@@ -170,13 +192,22 @@ private final class EnterURLVC : UIViewController {
     
     private lazy var suggestionGrid: OpenGroupSuggestionGrid = {
         let maxWidth = UIScreen.main.bounds.width - Values.largeSpacing * 2
-        return OpenGroupSuggestionGrid(maxWidth: maxWidth)
+        let result = OpenGroupSuggestionGrid(maxWidth: maxWidth)
+        result.delegate = self
+        return result
     }()
     
     // MARK: Lifecycle
     override func viewDidLoad() {
         // Remove background color
         view.backgroundColor = .clear
+        // Suggestion grid title label
+        let suggestionGridTitleLabel = UILabel()
+        suggestionGridTitleLabel.textColor = Colors.text
+        suggestionGridTitleLabel.font = .boldSystemFont(ofSize: Values.largeFontSize)
+        suggestionGridTitleLabel.text = "Or join one of these..."
+        suggestionGridTitleLabel.numberOfLines = 0
+        suggestionGridTitleLabel.lineBreakMode = .byWordWrapping
         // Next button
         let nextButton = Button(style: .prominentOutline, size: .large)
         nextButton.setTitle(NSLocalizedString("next", comment: ""), for: UIControl.State.normal)
@@ -187,11 +218,9 @@ private final class EnterURLVC : UIViewController {
         nextButton.pin(.top, to: .top, of: nextButtonContainer)
         nextButtonContainer.pin(.trailing, to: .trailing, of: nextButton, withInset: 80)
         nextButtonContainer.pin(.bottom, to: .bottom, of: nextButton)
-        // Spacers
-        let spacer1 = UIView.vStretchingSpacer()
-        let spacer2 = UIView.vStretchingSpacer()
         // Stack view
-        let stackView = UIStackView(arrangedSubviews: [ urlTextField, spacer1, suggestionGrid, spacer2, nextButtonContainer ])
+        let stackView = UIStackView(arrangedSubviews: [ urlTextField, UIView.spacer(withHeight: Values.mediumSpacing), suggestionGridTitleLabel,
+            UIView.spacer(withHeight: Values.mediumSpacing), suggestionGrid, UIView.vStretchingSpacer(), nextButtonContainer ])
         stackView.axis = .vertical
         stackView.alignment = .fill
         stackView.layoutMargins = UIEdgeInsets(uniform: Values.largeSpacing)
@@ -200,7 +229,6 @@ private final class EnterURLVC : UIViewController {
         stackView.pin(to: view)
         // Constraints
         view.set(.width, to: UIScreen.main.bounds.width)
-        spacer1.heightAnchor.constraint(equalTo: spacer2.heightAnchor).isActive = true
         // Dismiss keyboard on tap
         let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
         view.addGestureRecognizer(tapGestureRecognizer)
@@ -216,6 +244,10 @@ private final class EnterURLVC : UIViewController {
     }
     
     // MARK: Interaction
+    func join(_ room: OpenGroupAPIV2.Info) {
+        joinOpenGroupVC.join(room.id, on: OpenGroupAPIV2.defaultServer, with: OpenGroupAPIV2.defaultServerPublicKey)
+    }
+    
     @objc private func joinOpenGroupIfPossible() {
         let url = urlTextField.text?.trimmingCharacters(in: .whitespaces) ?? ""
         joinOpenGroupVC.joinOpenGroupIfPossible(with: url)

Session/Open Groups/OpenGroupSuggestionGrid.swift

@@ -1,8 +1,11 @@
+import PromiseKit
+import NVActivityIndicatorView
 
 final class OpenGroupSuggestionGrid : UIView, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
     private let maxWidth: CGFloat
-    private var rooms: [OpenGroupAPIV2.Info] = [] { didSet { reload() } }
+    private var rooms: [OpenGroupAPIV2.Info] = [] { didSet { update() } }
     private var heightConstraint: NSLayoutConstraint!
+    var delegate: OpenGroupSuggestionGridDelegate?
     
     // MARK: UI Components
     private lazy var layout: UICollectionViewFlowLayout = {
@@ -22,6 +25,13 @@ final class OpenGroupSuggestionGrid : UIView, UICollectionViewDataSource, UIColl
         return result
     }()
     
+    private lazy var spinner: NVActivityIndicatorView = {
+        let result = NVActivityIndicatorView(frame: CGRect.zero, type: .circleStrokeSpin, color: Colors.text, padding: nil)
+        result.set(.width, to: 64)
+        result.set(.height, to: 64)
+        return result
+    }()
+    
     // MARK: Settings
     private static let cellHeight: CGFloat = 40
     private static let separatorWidth = 1 / UIScreen.main.scale
@@ -44,43 +54,59 @@ final class OpenGroupSuggestionGrid : UIView, UICollectionViewDataSource, UIColl
     private func initialize() {
         addSubview(collectionView)
         collectionView.pin(to: self)
-        heightConstraint = set(.height, to: 0)
-        attempt(maxRetryCount: 8, recoveringOn: DispatchQueue.main) {
-            return OpenGroupAPIV2.getAllRooms(from: "https://sessionopengroup.com").done { [weak self] rooms in
+        addSubview(spinner)
+        spinner.pin([ UIView.HorizontalEdge.left, UIView.VerticalEdge.top ], to: self)
+        spinner.startAnimating()
+        heightConstraint = set(.height, to: 64)
+        widthAnchor.constraint(greaterThanOrEqualToConstant: 64).isActive = true
+        let _ = OpenGroupAPIV2.getDefaultRoomsPromise?.done { [weak self] rooms in
             self?.rooms = rooms
         }
-        }.retainUntilComplete()
     }
     
     // MARK: Updating
-    private func reload() {
-        let height = OpenGroupSuggestionGrid.cellHeight * ceil(CGFloat(rooms.count) / 3)
+    private func update() {
+        spinner.stopAnimating()
+        spinner.isHidden = true
+        let height = OpenGroupSuggestionGrid.cellHeight * ceil(CGFloat(rooms.count) / 2)
         heightConstraint.constant = height
         collectionView.reloadData()
     }
     
     // MARK: Layout
     func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
-        return CGSize(width: maxWidth / 3, height: OpenGroupSuggestionGrid.cellHeight)
+        return CGSize(width: maxWidth / 2, height: OpenGroupSuggestionGrid.cellHeight)
     }
     
     // MARK: Data Source
     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
-        return min(rooms.count, 12) // Cap to a maximum of 12 (4 rows of 3)
+        return min(rooms.count, 8) // Cap to a maximum of 8 (4 rows of 2)
     }
     
     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell.identifier, for: indexPath) as! Cell
+        cell.showRightSeparator = (indexPath.row % 2 != 0) || (indexPath.row % 2 == 0 && indexPath.row == rooms.count - 1)
+        cell.showBottomSeparator = (indexPath.row >= rooms.count - 2)
         cell.room = rooms[indexPath.item]
         return cell
     }
+    
+    // MARK: Interaction
+    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+        let room = rooms[indexPath.item]
+        delegate?.join(room)
+    }
 }
 
 // MARK: Cell
 extension OpenGroupSuggestionGrid {
     
     fileprivate final class Cell : UICollectionViewCell {
+        var showRightSeparator = false
+        var showBottomSeparator = false
         var room: OpenGroupAPIV2.Info? { didSet { update() } }
+        private var rightSeparator: UIView!
+        private var bottomSeparator: UIView!
         
         static let identifier = "OpenGroupSuggestionGridCell"
         
@@ -107,11 +133,47 @@ extension OpenGroupSuggestionGrid {
             label.center(in: self)
             label.leadingAnchor.constraint(greaterThanOrEqualTo: leadingAnchor, constant: Values.smallSpacing).isActive = true
             trailingAnchor.constraint(greaterThanOrEqualTo: label.trailingAnchor, constant: Values.smallSpacing).isActive = true
+            setUpSeparators()
+        }
+        
+        private func setUpSeparators() {
+            func getVSeparator() -> UIView {
+                let separator = UIView()
+                separator.backgroundColor = Colors.separator
+                separator.set(.height, to: 1 / UIScreen.main.scale)
+                return separator
+            }
+            func getHSeparator() -> UIView {
+                let separator = UIView()
+                separator.backgroundColor = Colors.separator
+                separator.set(.width, to: 1 / UIScreen.main.scale)
+                return separator
+            }
+            let leftSeparator = getHSeparator()
+            addSubview(leftSeparator)
+            leftSeparator.pin([ UIView.HorizontalEdge.left, UIView.VerticalEdge.top, UIView.VerticalEdge.bottom ], to: self)
+            let topSeparator = getVSeparator()
+            addSubview(topSeparator)
+            topSeparator.pin([ UIView.HorizontalEdge.left, UIView.VerticalEdge.top, UIView.HorizontalEdge.right ], to: self)
+            rightSeparator = getHSeparator()
+            addSubview(rightSeparator)
+            rightSeparator.pin([ UIView.VerticalEdge.top, UIView.HorizontalEdge.right, UIView.VerticalEdge.bottom ], to: self)
+            bottomSeparator = getVSeparator()
+            addSubview(bottomSeparator)
+            bottomSeparator.pin([ UIView.HorizontalEdge.left, UIView.VerticalEdge.bottom, UIView.HorizontalEdge.right ], to: self)
         }
         
         private func update() {
             guard let room = room else { return }
             label.text = room.name
+            rightSeparator.alpha = showRightSeparator ? 1 :0
+            bottomSeparator.alpha = showBottomSeparator ? 1 :0
+        }
     }
 }
+
+// MARK: Delegate
+protocol OpenGroupSuggestionGridDelegate {
+    
+    func join(_ room: OpenGroupAPIV2.Info)
 }

SessionMessagingKit/Open Groups/V2/OpenGroupAPIV2+ObjC.swift

@@ -11,4 +11,9 @@ extension OpenGroupAPIV2 {
     public static func objc_isUserModerator(_ publicKey: String, for room: String, on server: String) -> Bool {
         return isUserModerator(publicKey, for: room, on: server)
     }
+    
+    @objc(getDefaultRoomsIfNeeded)
+    public static func objc_getDefaultRoomsIfNeeded() {
+        return getDefaultRoomsIfNeeded()
+    }
 }

SessionMessagingKit/Open Groups/V2/OpenGroupAPIV2.swift

@@ -8,6 +8,9 @@ import SessionSnodeKit
 @objc(SNOpenGroupAPIV2)
 public final class OpenGroupAPIV2 : NSObject {
     private static var moderators: [String:[String:Set<String>]] = [:] // Server URL to room ID to set of moderator IDs
+    public static let defaultServer = "https://sessionopengroup.com"
+    public static let defaultServerPublicKey = "658d29b91892a2389505596b135e76a53db6e11d613a51dbd3d0816adffb231b"
+    public static var getDefaultRoomsPromise: Promise<[Info]>?
     
     // MARK: Error
     public enum Error : LocalizedError {
@@ -280,6 +283,16 @@ public final class OpenGroupAPIV2 : NSObject {
     }
     
     // MARK: General
+    public static func getDefaultRoomsIfNeeded() {
+        Storage.shared.write(with: { transaction in
+            Storage.shared.setOpenGroupPublicKey(for: defaultServer, to: defaultServerPublicKey, using: transaction)
+        }, completion: {
+            getDefaultRoomsPromise = attempt(maxRetryCount: 8, recoveringOn: DispatchQueue.main) {
+                OpenGroupAPIV2.getAllRooms(from: defaultServer)
+            }
+        })
+    }
+    
     public static func getInfo(for room: String, on server: String) -> Promise<Info> {
         let request = Request(verb: .get, room: room, server: server, endpoint: "rooms/\(room)", isAuthRequired: false)
         let promise: Promise<Info> = send(request).map(on: DispatchQueue.global(qos: .userInitiated)) { json in

SessionMessagingKit/Open Groups/V2/OpenGroupManagerV2.swift

@@ -33,8 +33,11 @@ public final class OpenGroupManagerV2 : NSObject {
         let storage = Storage.shared
         storage.removeLastMessageServerID(for: room, on: server, using: transaction)
         storage.removeLastDeletionServerID(for: room, on: server, using: transaction)
-        storage.setOpenGroupPublicKey(for: server, to: publicKey, using: transaction)
+        storage.removeAuthToken(for: room, on: server, using: transaction)
         let (promise, seal) = Promise<Void>.pending()
+        let transaction = transaction as! YapDatabaseReadWriteTransaction
+        transaction.addCompletionQueue(DispatchQueue.global(qos: .default)) {
+            storage.setOpenGroupPublicKey(for: server, to: publicKey, using: transaction)
             OpenGroupAPIV2.getInfo(for: room, on: server).done(on: DispatchQueue.global(qos: .default)) { info in
                 let openGroup = OpenGroupV2(server: server, room: room, name: info.name, imageID: info.imageID)
                 let groupID = LKGroupUtilities.getEncodedOpenGroupIDAsData(openGroup.id)
@@ -58,6 +61,7 @@ public final class OpenGroupManagerV2 : NSObject {
             }.catch(on: DispatchQueue.global(qos: .default)) { error in
                 seal.reject(error)
             }
+        }
         return promise
     }