Post composition wip

DB/Sources/DB/Content/CompositionRecord.swift

@@ -0,0 +1,9 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import GRDB
+
+struct CompositionRecord: Codable, FetchableRecord, PersistableRecord {
+    let id: Composition.Id
+    let text: String
+}

DB/Sources/DB/Entities/Composition.swift

@@ -0,0 +1,24 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Foundation
+import GRDB
+
+public class Composition {
+    public let id: Id
+    public var text: String
+
+    public init(id: Id, text: String) {
+        self.id = id
+        self.text = text
+    }
+}
+
+public extension Composition {
+    typealias Id = UUID
+}
+
+extension Composition {
+    convenience init(record: CompositionRecord) {
+        self.init(id: record.id, text: record.text)
+    }
+}

DB/Sources/DB/Identity/IdentityDatabase.swift

@@ -182,6 +182,17 @@ public extension IdentityDatabase {
             .eraseToAnyPublisher()
     }
 
+    func authenticatedIdentitiesPublisher() -> AnyPublisher<[Identity], Error> {
+        ValueObservation.tracking(
+            IdentityInfo.request(IdentityRecord.order(IdentityRecord.Columns.lastUsedAt.desc))
+                .filter(IdentityRecord.Columns.authenticated == true && IdentityRecord.Columns.pending == false)
+                .fetchAll)
+            .removeDuplicates()
+            .publisher(in: databaseWriter)
+            .map { $0.map(Identity.init(info:)) }
+            .eraseToAnyPublisher()
+    }
+
     func immediateMostRecentlyUsedIdentityIdPublisher() -> AnyPublisher<Identity.Id?, Error> {
         ValueObservation.tracking(
             IdentityRecord.select(IdentityRecord.Columns.id)
@@ -199,6 +210,17 @@ public extension IdentityDatabase {
             .map { $0.map(Identity.init(info:)) }
             .eraseToAnyPublisher()
     }
+
+    func mostRecentAuthenticatedIdentity() throws -> Identity? {
+        guard let info = try databaseWriter.read(
+                IdentityInfo.request(IdentityRecord.order(IdentityRecord.Columns.lastUsedAt.desc))
+                    .filter(IdentityRecord.Columns.authenticated == true
+                                && IdentityRecord.Columns.pending == false)
+                    .fetchOne)
+        else { return nil }
+
+        return Identity(info: info)
+    }
 }
 
 private extension IdentityDatabase {

Data Sources/NewStatusDataSource.swift

@@ -0,0 +1,19 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import UIKit
+import ViewModels
+
+final class NewStatusDataSource: UICollectionViewDiffableDataSource<Int, Composition.Id> {
+    init(collectionView: UICollectionView, viewModelProvider: @escaping (IndexPath) -> CompositionViewModel) {
+        let registration = UICollectionView.CellRegistration<CompositionListCell, CompositionViewModel> {
+            $0.viewModel = $2
+        }
+
+        super.init(collectionView: collectionView) { collectionView, indexPath, _ in
+            collectionView.dequeueConfiguredReusableCell(
+                using: registration,
+                for: indexPath,
+                item: viewModelProvider(indexPath))
+        }
+    }
+}

Metatext.xcodeproj/project.pbxproj

@@ -49,7 +49,15 @@
 		D08E52BD257C635800FA2C5F /* NewStatusViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E5291257C53B600FA2C5F /* NewStatusViewController.swift */; };
 		D08E52C7257C7AEE00FA2C5F /* ShareErrorViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52C6257C7AEE00FA2C5F /* ShareErrorViewController.swift */; };
 		D08E52CC257C80E300FA2C5F /* Localizable.strings in Resources */ = {isa = PBXBuildFile; fileRef = D0C7D45724F76169001EBDBB /* Localizable.strings */; };
-		D08E52D2257C811200FA2C5F /* ShareExtensionError.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52D1257C811200FA2C5F /* ShareExtensionError.swift */; };
+		D08E52D2257C811200FA2C5F /* ShareExtensionError+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52D1257C811200FA2C5F /* ShareExtensionError+Extensions.swift */; };
+		D08E52DC257D742B00FA2C5F /* CompositionListCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52DB257D742B00FA2C5F /* CompositionListCell.swift */; };
+		D08E52DD257D742B00FA2C5F /* CompositionListCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52DB257D742B00FA2C5F /* CompositionListCell.swift */; };
+		D08E52E3257D747400FA2C5F /* CompositionContentConfiguration.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52E2257D747400FA2C5F /* CompositionContentConfiguration.swift */; };
+		D08E52E4257D747400FA2C5F /* CompositionContentConfiguration.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52E2257D747400FA2C5F /* CompositionContentConfiguration.swift */; };
+		D08E52EE257D757100FA2C5F /* CompositionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52ED257D757100FA2C5F /* CompositionView.swift */; };
+		D08E52EF257D757100FA2C5F /* CompositionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D08E52ED257D757100FA2C5F /* CompositionView.swift */; };
+		D08E52F8257D78BE00FA2C5F /* ViewConstants.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0EA59472522B8B600804347 /* ViewConstants.swift */; };
+		D08E52FD257D78CB00FA2C5F /* UIColor+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0C7D46C24F76169001EBDBB /* UIColor+Extensions.swift */; };
 		D0A1F4F7252E7D4B004435BF /* TableViewDataSource.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0A1F4F6252E7D4B004435BF /* TableViewDataSource.swift */; };
 		D0A7AC7325748BFF00E4E8AB /* ReportStatusView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0A7AC7225748BFF00E4E8AB /* ReportStatusView.swift */; };
 		D0B32F50250B373600311912 /* RegistrationView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0B32F4F250B373600311912 /* RegistrationView.swift */; };
@@ -97,6 +105,11 @@
 		D0F0B126251A90F400942152 /* AccountListCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0F0B125251A90F400942152 /* AccountListCell.swift */; };
 		D0F0B12E251A97E400942152 /* TableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0F0B12D251A97E400942152 /* TableViewController.swift */; };
 		D0F0B136251AA12700942152 /* CollectionItem+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0F0B135251AA12700942152 /* CollectionItem+Extensions.swift */; };
+		D0F2D4D1257EE84400986197 /* NewStatusDataSource.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0F2D4D0257EE84400986197 /* NewStatusDataSource.swift */; };
+		D0F2D4D6257EED6100986197 /* NewStatusDataSource.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0F2D4D0257EE84400986197 /* NewStatusDataSource.swift */; };
+		D0F2D4DB257F018300986197 /* Array+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D01C6FAB252024BD003D0300 /* Array+Extensions.swift */; };
+		D0F2D54025818C4B00986197 /* Kingfisher in Frameworks */ = {isa = PBXBuildFile; productRef = D0F2D53F25818C4B00986197 /* Kingfisher */; };
+		D0F2D5452581ABAB00986197 /* KingfisherOptionsInfo+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0C7D46E24F76169001EBDBB /* KingfisherOptionsInfo+Extensions.swift */; };
 		D0FE1C8F253686F9003EF1EB /* PlayerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0FE1C8E253686F9003EF1EB /* PlayerView.swift */; };
 		D0FE1C9825368A9D003EF1EB /* PlayerCache.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0FE1C9725368A9D003EF1EB /* PlayerCache.swift */; };
 /* End PBXBuildFile section */
@@ -185,7 +198,10 @@
 		D08E529B257C58D600FA2C5F /* NewStatusView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NewStatusView.swift; sourceTree = "<group>"; };
 		D08E52A5257C61C000FA2C5F /* ShareExtensionNavigationViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareExtensionNavigationViewController.swift; sourceTree = "<group>"; };
 		D08E52C6257C7AEE00FA2C5F /* ShareErrorViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareErrorViewController.swift; sourceTree = "<group>"; };
-		D08E52D1257C811200FA2C5F /* ShareExtensionError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareExtensionError.swift; sourceTree = "<group>"; };
+		D08E52D1257C811200FA2C5F /* ShareExtensionError+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ShareExtensionError+Extensions.swift"; sourceTree = "<group>"; };
+		D08E52DB257D742B00FA2C5F /* CompositionListCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CompositionListCell.swift; sourceTree = "<group>"; };
+		D08E52E2257D747400FA2C5F /* CompositionContentConfiguration.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CompositionContentConfiguration.swift; sourceTree = "<group>"; };
+		D08E52ED257D757100FA2C5F /* CompositionView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CompositionView.swift; sourceTree = "<group>"; };
 		D0A1F4F6252E7D4B004435BF /* TableViewDataSource.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TableViewDataSource.swift; sourceTree = "<group>"; };
 		D0A7AC7225748BFF00E4E8AB /* ReportStatusView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ReportStatusView.swift; sourceTree = "<group>"; };
 		D0AD03552505814D0085A466 /* Base16 */ = {isa = PBXFileReference; lastKnownFileType = folder; path = Base16; sourceTree = "<group>"; };
@@ -242,6 +258,7 @@
 		D0F0B125251A90F400942152 /* AccountListCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AccountListCell.swift; sourceTree = "<group>"; };
 		D0F0B12D251A97E400942152 /* TableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TableViewController.swift; sourceTree = "<group>"; };
 		D0F0B135251AA12700942152 /* CollectionItem+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CollectionItem+Extensions.swift"; sourceTree = "<group>"; };
+		D0F2D4D0257EE84400986197 /* NewStatusDataSource.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NewStatusDataSource.swift; sourceTree = "<group>"; };
 		D0FE1C8E253686F9003EF1EB /* PlayerView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PlayerView.swift; sourceTree = "<group>"; };
 		D0FE1C9725368A9D003EF1EB /* PlayerCache.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PlayerCache.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -268,6 +285,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				D0F2D54025818C4B00986197 /* Kingfisher in Frameworks */,
 				D08E52B8257C62D500FA2C5F /* ViewModels in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -373,7 +391,7 @@
 				D08E5273257C36CA00FA2C5F /* Info.plist */,
 				D08E5277257C36CB00FA2C5F /* Share Extension.entitlements */,
 				D08E52C6257C7AEE00FA2C5F /* ShareErrorViewController.swift */,
-				D08E52D1257C811200FA2C5F /* ShareExtensionError.swift */,
+				D08E52D1257C811200FA2C5F /* ShareExtensionError+Extensions.swift */,
 				D08E52A5257C61C000FA2C5F /* ShareExtensionNavigationViewController.swift */,
 			);
 			path = "Share Extension";
@@ -383,6 +401,7 @@
 			isa = PBXGroup;
 			children = (
 				D0A1F4F6252E7D4B004435BF /* TableViewDataSource.swift */,
+				D0F2D4D0257EE84400986197 /* NewStatusDataSource.swift */,
 			);
 			path = "Data Sources";
 			sourceTree = "<group>";
@@ -405,6 +424,9 @@
 				D0F0B125251A90F400942152 /* AccountListCell.swift */,
 				D0F0B10D251A868200942152 /* AccountView.swift */,
 				D0C7D42424F76169001EBDBB /* AddIdentityView.swift */,
+				D08E52E2257D747400FA2C5F /* CompositionContentConfiguration.swift */,
+				D08E52DB257D742B00FA2C5F /* CompositionListCell.swift */,
+				D08E52ED257D757100FA2C5F /* CompositionView.swift */,
 				D007023D25562A2800F38136 /* ConversationAvatarsView.swift */,
 				D00702352555F4C500F38136 /* ConversationContentConfiguration.swift */,
 				D00702282555E51200F38136 /* ConversationListCell.swift */,
@@ -577,6 +599,7 @@
 			name = "Share Extension";
 			packageProductDependencies = (
 				D08E52B7257C62D500FA2C5F /* ViewModels */,
+				D0F2D53F25818C4B00986197 /* Kingfisher */,
 			);
 			productName = "Share Extension";
 			productReference = D08E526C257C36CA00FA2C5F /* Share Extension.appex */;
@@ -715,6 +738,7 @@
 			files = (
 				D0C7D4A324F7616A001EBDBB /* TabNavigationView.swift in Sources */,
 				D02E1F95250B13210071AD56 /* SafariView.swift in Sources */,
+				D0F2D4D1257EE84400986197 /* NewStatusDataSource.swift in Sources */,
 				D00702292555E51200F38136 /* ConversationListCell.swift in Sources */,
 				D03B1B2A253818F3008F964B /* MediaPreferencesView.swift in Sources */,
 				D0C7D49C24F7616A001EBDBB /* RootView.swift in Sources */,
@@ -722,8 +746,10 @@
 				D0B32F50250B373600311912 /* RegistrationView.swift in Sources */,
 				D08B8D612540DE3B00B1EBEF /* ZoomDismissalInteractionController.swift in Sources */,
 				D036AA07254B6118009094DF /* NotificationView.swift in Sources */,
+				D08E52EE257D757100FA2C5F /* CompositionView.swift in Sources */,
 				D0E569E0252931B100FA1D72 /* LoadMoreContentConfiguration.swift in Sources */,
 				D0FE1C9825368A9D003EF1EB /* PlayerCache.swift in Sources */,
+				D08E52E3257D747400FA2C5F /* CompositionContentConfiguration.swift in Sources */,
 				D0F0B136251AA12700942152 /* CollectionItem+Extensions.swift in Sources */,
 				D007023E25562A2800F38136 /* ConversationAvatarsView.swift in Sources */,
 				D0625E5D250F0B5C00502611 /* StatusContentConfiguration.swift in Sources */,
@@ -743,6 +769,7 @@
 				D0E569DB2529319100FA1D72 /* LoadMoreView.swift in Sources */,
 				D0C7D49D24F7616A001EBDBB /* PostingReadingPreferencesView.swift in Sources */,
 				D0B5FE9B251583DB00478838 /* ProfileCollection+Extensions.swift in Sources */,
+				D08E52DC257D742B00FA2C5F /* CompositionListCell.swift in Sources */,
 				D0C7D49E24F7616A001EBDBB /* SecondaryNavigationView.swift in Sources */,
 				D08B8D602540DE3B00B1EBEF /* ZoomAnimator.swift in Sources */,
 				D08E5292257C53B600FA2C5F /* NewStatusViewController.swift in Sources */,
@@ -804,8 +831,16 @@
 			files = (
 				D08E52A6257C61C000FA2C5F /* ShareExtensionNavigationViewController.swift in Sources */,
 				D08E52BD257C635800FA2C5F /* NewStatusViewController.swift in Sources */,
-				D08E52D2257C811200FA2C5F /* ShareExtensionError.swift in Sources */,
+				D08E52D2257C811200FA2C5F /* ShareExtensionError+Extensions.swift in Sources */,
+				D0F2D4DB257F018300986197 /* Array+Extensions.swift in Sources */,
+				D08E52DD257D742B00FA2C5F /* CompositionListCell.swift in Sources */,
+				D08E52EF257D757100FA2C5F /* CompositionView.swift in Sources */,
+				D0F2D5452581ABAB00986197 /* KingfisherOptionsInfo+Extensions.swift in Sources */,
 				D08E52C7257C7AEE00FA2C5F /* ShareErrorViewController.swift in Sources */,
+				D08E52F8257D78BE00FA2C5F /* ViewConstants.swift in Sources */,
+				D0F2D4D6257EED6100986197 /* NewStatusDataSource.swift in Sources */,
+				D08E52FD257D78CB00FA2C5F /* UIColor+Extensions.swift in Sources */,
+				D08E52E4257D747400FA2C5F /* CompositionContentConfiguration.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -1237,6 +1272,11 @@
 			isa = XCSwiftPackageProductDependency;
 			productName = ViewModels;
 		};
+		D0F2D53F25818C4B00986197 /* Kingfisher */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D06B492124D4611300642749 /* XCRemoteSwiftPackageReference "Kingfisher" */;
+			productName = Kingfisher;
+		};
 /* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = D047FA8024C3E21000AF17C5 /* Project object */;

ServiceLayer/Sources/ServiceLayer/Entities/AppEnvironment.swift

@@ -8,13 +8,14 @@ import Mastodon
 import UserNotifications
 
 public struct AppEnvironment {
+    public let uuid: () -> UUID
+
     let session: URLSession
     let webAuthSessionType: WebAuthSession.Type
     let keychain: Keychain.Type
     let userDefaults: UserDefaults
     let userNotificationClient: UserNotificationClient
     let reduceMotion: () -> Bool
-    let uuid: () -> UUID
     let inMemoryContent: Bool
     let fixtureDatabase: IdentityDatabase?
 

ServiceLayer/Sources/ServiceLayer/Entities/Composition.swift

@@ -0,0 +1,5 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import DB
+
+public typealias Composition = DB.Composition

ServiceLayer/Sources/ServiceLayer/Services/AllIdentitiesService.swift

@@ -39,6 +39,14 @@ public extension AllIdentitiesService {
         database.immediateMostRecentlyUsedIdentityIdPublisher()
     }
 
+    func authenticatedIdentitiesPublisher() -> AnyPublisher<[Identity], Error> {
+        database.authenticatedIdentitiesPublisher()
+    }
+
+    func mostRecentAuthenticatedIdentity() throws -> Identity? {
+        try database.mostRecentAuthenticatedIdentity()
+    }
+
     func createIdentity(url: URL, kind: IdentityCreation) -> AnyPublisher<Never, Error> {
         let id = environment.uuid()
         let secrets = Secrets(identityId: id, keychain: environment.keychain)

ServiceLayer/Sources/ServiceLayer/Services/IdentityService.swift

@@ -228,10 +228,6 @@ public extension IdentityService {
     func domainBlocksService() -> DomainBlocksService {
         DomainBlocksService(mastodonAPIClient: mastodonAPIClient)
     }
-
-    func newStatusService() -> NewStatusService {
-        NewStatusService(id: id, identityDatabase: identityDatabase, environment: environment)
-    }
 }
 
 private extension IdentityService {

ServiceLayer/Sources/ServiceLayer/Services/NewStatusService.swift

@@ -1,35 +0,0 @@
-// Copyright © 2020 Metabolist. All rights reserved.
-
-import Combine
-import DB
-import Foundation
-import Mastodon
-import MastodonAPI
-import Secrets
-
-public struct NewStatusService {
-    private var id: Identity.Id
-    private let identityDatabase: IdentityDatabase
-    private let environment: AppEnvironment
-
-    public init(id: Identity.Id, identityDatabase: IdentityDatabase, environment: AppEnvironment) {
-        self.id = id
-        self.identityDatabase = identityDatabase
-        self.environment = environment
-    }
-}
-
-extension NewStatusService {
-    func mastodonAPIClient() throws -> MastodonAPIClient {
-        let secrets = Secrets(
-            identityId: id,
-            keychain: environment.keychain)
-        let mastodonAPIClient = MastodonAPIClient(
-            session: environment.session,
-            instanceURL: try secrets.getInstanceURL())
-
-        mastodonAPIClient.accessToken = try secrets.getAccessToken()
-
-        return mastodonAPIClient
-    }
-}

Share Extension/ShareExtensionError+Extensions.swift

@@ -1,13 +1,10 @@
 // Copyright © 2020 Metabolist. All rights reserved.
 
 import Foundation
-
+import ViewModels
-enum ShareExtensionError: Error {
-    case noAccountFound
-}
 
 extension ShareExtensionError: LocalizedError {
-    var errorDescription: String? {
+    public var errorDescription: String? {
         switch self {
         case .noAccountFound:
             return NSLocalizedString("share-extension-error.no-account-found", comment: "")

Share Extension/ShareExtensionNavigationViewController.swift

@@ -7,20 +7,26 @@ import ViewModels
 
 @objc(ShareExtensionNavigationViewController)
 class ShareExtensionNavigationViewController: UINavigationController {
+    private let viewModel = ShareExtensionNavigationViewModel(
+        environment: .live(
+            userNotificationCenter: .current(),
+            reduceMotion: { UIAccessibility.isReduceMotionEnabled }))
     override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
         super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
 
-        let viewModel: NewStatusViewModel
+        let newStatusViewModel: NewStatusViewModel
 
         do {
-            viewModel = try newStatusViewModel()
+            newStatusViewModel = try viewModel.newStatusViewModel()
         } catch {
             setViewControllers([ShareErrorViewController(error: error)], animated: false)
 
             return
         }
 
-        setViewControllers([NewStatusViewController(viewModel: viewModel)], animated: false)
+        setViewControllers(
+            [NewStatusViewController(viewModel: newStatusViewModel, isShareExtension: true)],
+            animated: false)
     }
 
     @available(*, unavailable)
@@ -28,23 +34,3 @@ class ShareExtensionNavigationViewController: UINavigationController {
         fatalError("init(coder:) has not been implemented")
     }
 }
-
-private extension ShareExtensionNavigationViewController {
-    func newStatusViewModel() throws -> NewStatusViewModel {
-        let environment = AppEnvironment.live(
-            userNotificationCenter: .current(),
-            reduceMotion: { UIAccessibility.isReduceMotionEnabled })
-        let allIdentitiesService = try AllIdentitiesService(environment: environment)
-
-        var recentId: Identity.Id?
-
-        _ = allIdentitiesService.immediateMostRecentlyUsedIdentityIdPublisher()
-            .sink { _ in } receiveValue: { recentId = $0 }
-
-        guard let id = recentId else { throw ShareExtensionError.noAccountFound }
-
-        let newStatusService = try allIdentitiesService.identityService(id: id).newStatusService()
-
-        return NewStatusViewModel(service: newStatusService)
-    }
-}

View Controllers/NewStatusViewController.swift

@@ -1,15 +1,35 @@
 // Copyright © 2020 Metabolist. All rights reserved.
 
+import Combine
+import Kingfisher
 import UIKit
 import ViewModels
 
-class NewStatusViewController: UIViewController {
+class NewStatusViewController: UICollectionViewController {
     private let viewModel: NewStatusViewModel
+    private let isShareExtension: Bool
+    private var cancellables = Set<AnyCancellable>()
 
-    init(viewModel: NewStatusViewModel) {
+    private lazy var dataSource: NewStatusDataSource = {
+        .init(collectionView: collectionView, viewModelProvider: viewModel.viewModel(indexPath:))
+    }()
+
+    init(viewModel: NewStatusViewModel, isShareExtension: Bool) {
         self.viewModel = viewModel
+        self.isShareExtension = isShareExtension
 
-        super.init(nibName: nil, bundle: nil)
+        let configuration = UICollectionLayoutListConfiguration(appearance: .plain)
+        let layout = UICollectionViewCompositionalLayout.list(using: configuration)
+
+        super.init(collectionViewLayout: layout)
+
+        viewModel.$identification
+            .sink { [weak self] in
+                guard let self = self else { return }
+
+                self.setupBarButtonItems(identification: $0)
+            }
+            .store(in: &cancellables)
     }
 
     @available(*, unavailable)
@@ -20,18 +40,103 @@ class NewStatusViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
 
+        collectionView.dataSource = dataSource
+
         view.backgroundColor = .systemBackground
 
-        navigationItem.leftBarButtonItem = .init(
+        setupBarButtonItems(identification: viewModel.identification)
-            systemItem: .close,
+
-            primaryAction: UIAction { [weak self] _ in self?.extensionContext?.completeRequest(returningItems: nil) })
+        viewModel.$compositionViewModels.sink { [weak self] in
+            self?.dataSource.apply([$0.map(\.composition.id)].snapshot()) {
+                DispatchQueue.main.async {
+                    if let collectionView = self?.collectionView,
+                       collectionView.indexPathsForSelectedItems?.isEmpty ?? false {
+                        collectionView.selectItem(
+                            at: collectionView.indexPathsForVisibleItems.first,
+                            animated: false,
+                            scrollPosition: .top)
+                    }
+                }
+            }
+        }
+        .store(in: &cancellables)
     }
 
     override func didMove(toParent parent: UIViewController?) {
         super.didMove(toParent: parent)
 
-        parent?.navigationItem.leftBarButtonItem = .init(
+        setupBarButtonItems(identification: viewModel.identification)
+    }
+
+    override func collectionView(_ collectionView: UICollectionView,
+                                 willDisplay cell: UICollectionViewCell,
+                                 forItemAt indexPath: IndexPath) {
+        ((cell as? CompositionListCell)?.contentView as? CompositionView)?.textView.delegate = self
+    }
+
+    func setupBarButtonItems(identification: Identification) {
+        let target = isShareExtension ? self : parent
+        let closeButton = UIBarButtonItem(
             systemItem: .close,
-            primaryAction: UIAction { [weak self] _ in self?.presentingViewController?.dismiss(animated: true) })
+            primaryAction: UIAction { [weak self] _ in self?.dismiss() })
+
+        target?.navigationItem.leftBarButtonItem = closeButton
+        target?.navigationItem.titleView = viewModel.canChangeIdentity
+            ? changeIdentityButton(identification: identification)
+            : nil
+    }
+
+    func dismiss() {
+        if isShareExtension {
+            extensionContext?.completeRequest(returningItems: nil)
+        } else {
+            presentingViewController?.dismiss(animated: true)
+        }
+    }
+}
+
+extension NewStatusViewController: UITextViewDelegate {
+    func textViewDidChange(_ textView: UITextView) {
+        collectionView.collectionViewLayout.invalidateLayout()
+    }
+}
+
+private extension NewStatusViewController {
+    func changeIdentityButton(identification: Identification) -> UIButton {
+        let changeIdentityButton = UIButton()
+        let downsampled = KingfisherOptionsInfo.downsampled(
+            dimension: .barButtonItemDimension,
+            scaleFactor: UIScreen.main.scale)
+
+        let menuItems = viewModel.authenticatedIdentities
+            .filter { $0.id != identification.identity.id }
+            .map { identity in
+                UIDeferredMenuElement { completion in
+                    let action = UIAction(title: identity.handle) { [weak self] _ in
+                        self?.viewModel.setIdentity(identity)
+                    }
+
+                    if let image = identity.image {
+                        KingfisherManager.shared.retrieveImage(with: image, options: downsampled) {
+                            if case let .success(value) = $0 {
+                                action.image = value.image
+                            }
+
+                            completion([action])
+                        }
+                    } else {
+                        completion([action])
+                    }
+                }
+            }
+
+        changeIdentityButton.kf.setImage(
+            with: identification.identity.image,
+            for: .normal,
+            options: downsampled)
+        changeIdentityButton.showsMenuAsPrimaryAction = true
+        changeIdentityButton.menu = UIMenu(children: menuItems)
+
+        return changeIdentityButton
     }
 }

ViewModels/Sources/PreviewViewModels/PreviewViewModels.swift

@@ -91,11 +91,7 @@ public extension DomainBlocksViewModel {
 }
 
 public extension NewStatusViewModel {
-    static let preview = NewStatusViewModel(
+    static let preview = RootViewModel.preview.newStatusViewModel(identification: .preview)
-        service: .init(
-            id: identityId,
-            identityDatabase: db,
-            environment: environment))
 }
 
 // swiftlint:enable force_try

ViewModels/Sources/ViewModels/CompositionViewModel.swift

@@ -0,0 +1,19 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Combine
+import Foundation
+import Mastodon
+import ServiceLayer
+
+public final class CompositionViewModel: ObservableObject {
+    public let composition: Composition
+    @Published public private(set) var identification: Identification
+
+    init(composition: Composition,
+         identification: Identification,
+         identificationPublisher: AnyPublisher<Identification, Never>) {
+        self.composition = composition
+        self.identification = identification
+        identificationPublisher.assign(to: &$identification)
+    }
+}

ViewModels/Sources/ViewModels/Entities/Composition.swift

@@ -0,0 +1,5 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import ServiceLayer
+
+public typealias Composition = ServiceLayer.Composition

ViewModels/Sources/ViewModels/NavigationViewModel.swift

@@ -153,10 +153,6 @@ public extension NavigationViewModel {
             collectionService: identification.service.service(timeline: .bookmarks),
             identification: identification)
     }
-
-    func newStatusViewModel() -> NewStatusViewModel {
-        NewStatusViewModel(service: identification.service.newStatusService())
-    }
 }
 
 extension NavigationViewModel.Tab: Identifiable {

ViewModels/Sources/ViewModels/NewStatusViewModel.swift

@@ -6,9 +6,53 @@ import Mastodon
 import ServiceLayer
 
 public final class NewStatusViewModel: ObservableObject {
-    private let service: NewStatusService
+    @Published public private(set) var compositionViewModels = [CompositionViewModel]()
+    @Published public private(set) var identification: Identification
+    @Published public private(set) var authenticatedIdentities = [Identity]()
+    @Published public var canChangeIdentity = true
+    @Published public var alertItem: AlertItem?
 
-    public init(service: NewStatusService) {
+    private let allIdentitiesService: AllIdentitiesService
-        self.service = service
+    private let environment: AppEnvironment
+    private var cancellables = Set<AnyCancellable>()
+
+    public init(allIdentitiesService: AllIdentitiesService,
+                identification: Identification,
+                environment: AppEnvironment) {
+        self.allIdentitiesService = allIdentitiesService
+        self.identification = identification
+        self.environment = environment
+        compositionViewModels = [CompositionViewModel(
+                                    composition: .init(id: environment.uuid(), text: ""),
+                                    identification: identification,
+                                    identificationPublisher: $identification.eraseToAnyPublisher())]
+        allIdentitiesService.authenticatedIdentitiesPublisher()
+            .assignErrorsToAlertItem(to: \.alertItem, on: self)
+            .assign(to: &$authenticatedIdentities)
+    }
+}
+
+public extension NewStatusViewModel {
+    func viewModel(indexPath: IndexPath) -> CompositionViewModel {
+        compositionViewModels[indexPath.row]
+    }
+
+    func setIdentity(_ identity: Identity) {
+        let identityService: IdentityService
+
+        do {
+            identityService = try allIdentitiesService.identityService(id: identity.id)
+        } catch {
+            alertItem = AlertItem(error: error)
+
+            return
+        }
+
+        identification = Identification(
+            identity: identity,
+            publisher: identityService.identityPublisher(immediate: false)
+                .assignErrorsToAlertItem(to: \.alertItem, on: self),
+            service: identityService,
+            environment: environment)
     }
 }

ViewModels/Sources/ViewModels/RootViewModel.swift

@@ -57,6 +57,13 @@ public extension RootViewModel {
             allIdentitiesService: allIdentitiesService,
             instanceURLService: InstanceURLService(environment: environment))
     }
+
+    func newStatusViewModel(identification: Identification) -> NewStatusViewModel {
+        NewStatusViewModel(
+            allIdentitiesService: allIdentitiesService,
+            identification: identification,
+            environment: environment)
+    }
 }
 
 private extension RootViewModel {

ViewModels/Sources/ViewModels/ShareExtensionNavigationViewModel.swift

@@ -0,0 +1,41 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Combine
+import Foundation
+import ServiceLayer
+
+public enum ShareExtensionError: Error {
+    case noAccountFound
+}
+
+public final class ShareExtensionNavigationViewModel: ObservableObject {
+    @Published public var alertItem: AlertItem?
+
+    private let environment: AppEnvironment
+
+    public init(environment: AppEnvironment) {
+        self.environment = environment
+    }
+}
+
+public extension ShareExtensionNavigationViewModel {
+    func newStatusViewModel() throws -> NewStatusViewModel {
+        let allIdentitiesService = try AllIdentitiesService(environment: environment)
+
+        guard let identity = try allIdentitiesService.mostRecentAuthenticatedIdentity()
+        else { throw ShareExtensionError.noAccountFound }
+
+        let identityService = try allIdentitiesService.identityService(id: identity.id)
+        let identification = Identification(
+            identity: identity,
+            publisher: identityService.identityPublisher(immediate: false)
+                .assignErrorsToAlertItem(to: \.alertItem, on: self),
+            service: identityService,
+            environment: environment)
+
+        return NewStatusViewModel(
+            allIdentitiesService: allIdentitiesService,
+            identification: identification,
+            environment: environment)
+    }
+}

Views/CompositionContentConfiguration.swift

@@ -0,0 +1,18 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import UIKit
+import ViewModels
+
+struct CompositionContentConfiguration {
+    let viewModel: CompositionViewModel
+}
+
+extension CompositionContentConfiguration: UIContentConfiguration {
+    func makeContentView() -> UIView & UIContentView {
+        CompositionView(configuration: self)
+    }
+
+    func updated(for state: UIConfigurationState) -> CompositionContentConfiguration {
+        self
+    }
+}

Views/CompositionListCell.swift

@@ -0,0 +1,23 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import UIKit
+import ViewModels
+
+class CompositionListCell: UICollectionViewListCell {
+    var viewModel: CompositionViewModel?
+
+    override func updateConfiguration(using state: UICellConfigurationState) {
+        guard let viewModel = viewModel else { return }
+
+        contentConfiguration = CompositionContentConfiguration(viewModel: viewModel).updated(for: state)
+        backgroundConfiguration = UIBackgroundConfiguration.clear().updated(for: state)
+    }
+
+    override var isSelected: Bool {
+        didSet {
+            if isSelected {
+                (contentView as? CompositionView)?.textView.becomeFirstResponder()
+            }
+        }
+    }
+}

Views/CompositionView.swift

@@ -0,0 +1,81 @@
+// Copyright © 2020 Metabolist. All rights reserved.
+
+import Combine
+import Kingfisher
+import UIKit
+
+class CompositionView: UIView {
+    let avatarImageView = UIImageView()
+    let textView = UITextView()
+
+    private var compositionConfiguration: CompositionContentConfiguration
+    private var cancellables = Set<AnyCancellable>()
+
+    init(configuration: CompositionContentConfiguration) {
+        self.compositionConfiguration = configuration
+
+        super.init(frame: .zero)
+
+        initialSetup()
+        applyCompositionConfiguration()
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+}
+
+extension CompositionView: UIContentView {
+    var configuration: UIContentConfiguration {
+        get { compositionConfiguration }
+        set {
+            guard let compositionConfiguration = newValue as? CompositionContentConfiguration else { return }
+
+            self.compositionConfiguration = compositionConfiguration
+
+            applyCompositionConfiguration()
+        }
+    }
+}
+
+private extension CompositionView {
+    func initialSetup() {
+        addSubview(avatarImageView)
+        avatarImageView.translatesAutoresizingMaskIntoConstraints = false
+        avatarImageView.layer.cornerRadius = .avatarDimension / 2
+        avatarImageView.clipsToBounds = true
+
+        let stackView = UIStackView()
+
+        addSubview(stackView)
+        stackView.translatesAutoresizingMaskIntoConstraints = false
+        stackView.axis = .vertical
+
+        stackView.addArrangedSubview(textView)
+        textView.isScrollEnabled = false
+        textView.adjustsFontForContentSizeCategory = true
+        textView.font = .preferredFont(forTextStyle: .body)
+        textView.textContainer.lineFragmentPadding = 0
+
+        NSLayoutConstraint.activate([
+            avatarImageView.widthAnchor.constraint(equalToConstant: .avatarDimension),
+            avatarImageView.heightAnchor.constraint(equalToConstant: .avatarDimension),
+            avatarImageView.topAnchor.constraint(equalTo: readableContentGuide.topAnchor),
+            avatarImageView.leadingAnchor.constraint(equalTo: readableContentGuide.leadingAnchor),
+            avatarImageView.bottomAnchor.constraint(lessThanOrEqualTo: readableContentGuide.bottomAnchor),
+            stackView.leadingAnchor.constraint(equalTo: avatarImageView.trailingAnchor, constant: .defaultSpacing),
+            stackView.topAnchor.constraint(equalTo: readableContentGuide.topAnchor),
+            stackView.trailingAnchor.constraint(equalTo: readableContentGuide.trailingAnchor),
+            stackView.bottomAnchor.constraint(equalTo: readableContentGuide.bottomAnchor)
+        ])
+
+        compositionConfiguration.viewModel.$identification.map(\.identity.image)
+            .sink { [weak self] in self?.avatarImageView.kf.setImage(with: $0) }
+            .store(in: &cancellables)
+    }
+
+    func applyCompositionConfiguration() {
+
+    }
+}

Views/NewStatusView.swift

@@ -7,7 +7,7 @@ struct NewStatusView: UIViewControllerRepresentable {
     let viewModelClosure: () -> NewStatusViewModel
 
     func makeUIViewController(context: Context) -> NewStatusViewController {
-        NewStatusViewController(viewModel: viewModelClosure())
+        NewStatusViewController(viewModel: viewModelClosure(), isShareExtension: false)
     }
 
     func updateUIViewController(_ uiViewController: NewStatusViewController, context: Context) {

Views/TabNavigationView.swift

@@ -41,7 +41,9 @@ struct TabNavigationView: View {
             EmptyView()
                 .fullScreenCover(isPresented: $viewModel.presentingNewStatus) {
                     NavigationView {
-                        NewStatusView(viewModelClosure: viewModel.newStatusViewModel)
+                        NewStatusView {
+                            rootViewModel.newStatusViewModel(identification: viewModel.identification)
+                        }
                         .edgesIgnoringSafeArea(.all)
                         .navigationBarTitleDisplayMode(.inline)
                     }
@@ -137,7 +139,9 @@ private extension TabNavigationView {
             viewModel.presentingSecondaryNavigation.toggle()
         } label: {
             KFImage(viewModel.identification.identity.image,
-                    options: .downsampled(dimension: 28, scaleFactor: displayScale))
+                    options: .downsampled(
+                        dimension: .barButtonItemDimension,
+                        scaleFactor: displayScale))
                 .placeholder { Image(systemName: "gear") }
                 .renderingMode(.original)
                 .contextMenu(ContextMenu {
@@ -149,7 +153,9 @@ private extension TabNavigationView {
                                 title: { Text(recentIdentity.handle) },
                                 icon: {
                                     KFImage(recentIdentity.image,
-                                            options: .downsampled(dimension: 28, scaleFactor: displayScale))
+                                            options: .downsampled(
+                                                dimension: .barButtonItemDimension,
+                                                scaleFactor: displayScale))
                                         .renderingMode(.original)
                                 })
                         }

Views/ViewConstants.swift

@@ -10,6 +10,7 @@ extension CGFloat {
     static let avatarDimension: Self = 50
     static let hairline = 1 / UIScreen.main.scale
     static let minimumButtonDimension: Self = 44
+    static let barButtonItemDimension: Self = 28
 }
 
 extension TimeInterval {