ios: file provider service

2022-06-01 17:26:15 +01:00 · 2022-06-01 17:26:15 +01:00 · 1b972bc7cc
commit 1b972bc7cc
parent fa844c48e9
6 changed files with 431 additions and 3 deletions
--- a/Service/FileProviderEnumerator.swift
+++ b/Service/FileProviderEnumerator.swift
@ -0,0 +1,51 @@
+//
+//  FileProviderEnumerator.swift
+//  SimpleX Service
+//
+//  Created by Evgeny on 01/06/2022.
+//  Copyright © 2022 SimpleX Chat. All rights reserved.
+//
+
+import FileProvider
+
+class FileProviderEnumerator: NSObject, NSFileProviderEnumerator {
+    
+    var enumeratedItemIdentifier: NSFileProviderItemIdentifier
+    
+    init(enumeratedItemIdentifier: NSFileProviderItemIdentifier) {
+        self.enumeratedItemIdentifier = enumeratedItemIdentifier
+        super.init()
+    }
+
+    func invalidate() {
+        // TODO: perform invalidation of server connection if necessary
+    }
+
+    func enumerateItems(for observer: NSFileProviderEnumerationObserver, startingAt page: NSFileProviderPage) {
+        /* TODO:
+         - inspect the page to determine whether this is an initial or a follow-up request
+         
+         If this is an enumerator for a directory, the root container or all directories:
+         - perform a server request to fetch directory contents
+         If this is an enumerator for the active set:
+         - perform a server request to update your local database
+         - fetch the active set from your local database
+         
+         - inform the observer about the items returned by the server (possibly multiple times)
+         - inform the observer that you are finished with this page
+         */
+    }
+    
+    func enumerateChanges(for observer: NSFileProviderChangeObserver, from anchor: NSFileProviderSyncAnchor) {
+        /* TODO:
+         - query the server for updates since the passed-in sync anchor
+         
+         If this is an enumerator for the active set:
+         - note the changes in your local database
+         
+         - inform the observer about item deletions and updates (modifications + insertions)
+         - inform the observer when you have finished enumerating up to a subsequent sync anchor
+         */
+    }
+
+}
--- a/Service/FileProviderExtension.swift
+++ b/Service/FileProviderExtension.swift
@ -0,0 +1,160 @@
+//
+//  FileProviderExtension.swift
+//  SimpleX Service
+//
+//  Created by Evgeny on 01/06/2022.
+//  Copyright © 2022 SimpleX Chat. All rights reserved.
+//
+
+import FileProvider
+
+class FileProviderExtension: NSFileProviderExtension {
+    
+    var fileManager = FileManager()
+    
+    override init() {
+        super.init()
+    }
+    
+    override func item(for identifier: NSFileProviderItemIdentifier) throws -> NSFileProviderItem {
+        // resolve the given identifier to a record in the model
+        
+        // TODO: implement the actual lookup
+        return FileProviderItem()
+    }
+    
+    override func urlForItem(withPersistentIdentifier identifier: NSFileProviderItemIdentifier) -> URL? {
+        // resolve the given identifier to a file on disk
+        guard let item = try? item(for: identifier) else {
+            return nil
+        }
+        
+        // in this implementation, all paths are structured as <base storage directory>/<item identifier>/<item file name>
+        let manager = NSFileProviderManager.default
+        let perItemDirectory = manager.documentStorageURL.appendingPathComponent(identifier.rawValue, isDirectory: true)
+        
+        return perItemDirectory.appendingPathComponent(item.filename, isDirectory:false)
+    }
+    
+    override func persistentIdentifierForItem(at url: URL) -> NSFileProviderItemIdentifier? {
+        // resolve the given URL to a persistent identifier using a database
+        let pathComponents = url.pathComponents
+        
+        // exploit the fact that the path structure has been defined as
+        // <base storage directory>/<item identifier>/<item file name> above
+        assert(pathComponents.count > 2)
+        
+        return NSFileProviderItemIdentifier(pathComponents[pathComponents.count - 2])
+    }
+    
+    override func providePlaceholder(at url: URL, completionHandler: @escaping (Error?) -> Void) {
+        guard let identifier = persistentIdentifierForItem(at: url) else {
+            completionHandler(NSFileProviderError(.noSuchItem))
+            return
+        }
+
+        do {
+            let fileProviderItem = try item(for: identifier)
+            let placeholderURL = NSFileProviderManager.placeholderURL(for: url)
+            try NSFileProviderManager.writePlaceholder(at: placeholderURL,withMetadata: fileProviderItem)
+            completionHandler(nil)
+        } catch let error {
+            completionHandler(error)
+        }
+    }
+
+    override func startProvidingItem(at url: URL, completionHandler: @escaping ((_ error: Error?) -> Void)) {
+        // Should ensure that the actual file is in the position returned by URLForItemWithIdentifier:, then call the completion handler
+        
+        /* TODO:
+         This is one of the main entry points of the file provider. We need to check whether the file already exists on disk,
+         whether we know of a more recent version of the file, and implement a policy for these cases. Pseudocode:
+         
+         if !fileOnDisk {
+             downloadRemoteFile()
+             callCompletion(downloadErrorOrNil)
+         } else if fileIsCurrent {
+             callCompletion(nil)
+         } else {
+             if localFileHasChanges {
+                 // in this case, a version of the file is on disk, but we know of a more recent version
+                 // we need to implement a strategy to resolve this conflict
+                 moveLocalFileAside()
+                 scheduleUploadOfLocalFile()
+                 downloadRemoteFile()
+                 callCompletion(downloadErrorOrNil)
+             } else {
+                 downloadRemoteFile()
+                 callCompletion(downloadErrorOrNil)
+             }
+         }
+         */
+        
+        completionHandler(NSError(domain: NSCocoaErrorDomain, code: NSFeatureUnsupportedError, userInfo:[:]))
+    }
+    
+    
+    override func itemChanged(at url: URL) {
+        // Called at some point after the file has changed; the provider may then trigger an upload
+        
+        /* TODO:
+         - mark file at <url> as needing an update in the model
+         - if there are existing NSURLSessionTasks uploading this file, cancel them
+         - create a fresh background NSURLSessionTask and schedule it to upload the current modifications
+         - register the NSURLSessionTask with NSFileProviderManager to provide progress updates
+         */
+    }
+    
+    override func stopProvidingItem(at url: URL) {
+        // Called after the last claim to the file has been released. At this point, it is safe for the file provider to remove the content file.
+        // Care should be taken that the corresponding placeholder file stays behind after the content file has been deleted.
+        
+        // Called after the last claim to the file has been released. At this point, it is safe for the file provider to remove the content file.
+        
+        // TODO: look up whether the file has local changes
+        let fileHasLocalChanges = false
+        
+        if !fileHasLocalChanges {
+            // remove the existing file to free up space
+            do {
+                _ = try FileManager.default.removeItem(at: url)
+            } catch {
+                // Handle error
+            }
+            
+            // write out a placeholder to facilitate future property lookups
+            self.providePlaceholder(at: url, completionHandler: { error in
+                // TODO: handle any error, do any necessary cleanup
+            })
+        }
+    }
+    
+    // MARK: - Actions
+    
+    /* TODO: implement the actions for items here
+     each of the actions follows the same pattern:
+     - make a note of the change in the local model
+     - schedule a server request as a background task to inform the server of the change
+     - call the completion block with the modified item in its post-modification state
+     */
+    
+    // MARK: - Enumeration
+    
+    override func enumerator(for containerItemIdentifier: NSFileProviderItemIdentifier) throws -> NSFileProviderEnumerator {
+        let maybeEnumerator: NSFileProviderEnumerator? = nil
+        if (containerItemIdentifier == NSFileProviderItemIdentifier.rootContainer) {
+            // TODO: instantiate an enumerator for the container root
+        } else if (containerItemIdentifier == NSFileProviderItemIdentifier.workingSet) {
+            // TODO: instantiate an enumerator for the working set
+        } else {
+            // TODO: determine if the item is a directory or a file
+            // - for a directory, instantiate an enumerator of its subitems
+            // - for a file, instantiate an enumerator that observes changes to the file
+        }
+        guard let enumerator = maybeEnumerator else {
+            throw NSError(domain: NSCocoaErrorDomain, code: NSFeatureUnsupportedError, userInfo:[:])
+        }
+        return enumerator
+    }
+    
+}
--- a/Service/FileProviderItem.swift
+++ b/Service/FileProviderItem.swift
@ -0,0 +1,37 @@
+//
+//  FileProviderItem.swift
+//  SimpleX Service
+//
+//  Created by Evgeny on 01/06/2022.
+//  Copyright © 2022 SimpleX Chat. All rights reserved.
+//
+
+import FileProvider
+import UniformTypeIdentifiers
+
+class FileProviderItem: NSObject, NSFileProviderItem {
+
+    // TODO: implement an initializer to create an item from your extension's backing model
+    // TODO: implement the accessors to return the values from your extension's backing model
+    
+    var itemIdentifier: NSFileProviderItemIdentifier {
+        return NSFileProviderItemIdentifier("")
+    }
+    
+    var parentItemIdentifier: NSFileProviderItemIdentifier {
+        return NSFileProviderItemIdentifier("")
+    }
+    
+    var capabilities: NSFileProviderItemCapabilities {
+        return [.allowsReading, .allowsWriting, .allowsRenaming, .allowsReparenting, .allowsTrashing, .allowsDeleting]
+    }
+    
+    var filename: String {
+        return ""
+    }
+    
+    var contentType: UTType {
+        return itemIdentifier == NSFileProviderItemIdentifier.rootContainer ? .folder : .plainText
+    }
+    
+}
--- a/Service/Info.plist
+++ b/Service/Info.plist
@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionFileProviderDocumentGroup</key>
+		<string>group.chat.simplex.app</string>
+		<key>NSExtensionFileProviderSupportsEnumeration</key>
+		<true/>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.fileprovider-nonui</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).FileProviderExtension</string>
+	</dict>
+</dict>
+</plist>
--- a/Service/SimpleX_Service.entitlements
+++ b/Service/SimpleX_Service.entitlements
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.application-groups</key>
+    <array>
+        <string>group.chat.simplex.app</string>
+    </array>
+</dict>
+</plist>
--- a/apps/ios/SimpleX.xcodeproj/project.pbxproj
+++ b/apps/ios/SimpleX.xcodeproj/project.pbxproj
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@ -164,6 +176,7 @@
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@ -342,6 +370,18 @@
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@ -391,6 +431,7 @@
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@ -432,9 +473,10 @@
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-				5CA059DA279559F40002BEB4 /* Tests iOS */,
 				5CE2BA692845308900EC33A6 /* SimpleXChat */,
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@ -626,6 +686,7 @@
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@ -700,6 +761,9 @@
 				LastUpgradeCheck = 1330;
 				ORGANIZATIONNAME = "SimpleX Chat";
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@ -736,13 +800,21 @@
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-				5CDCAD442818589900503DA2 /* SimpleX NSE */,
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+				DEVELOPMENT_TEAM = 5NN7GUYB6T;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "SimpleX Service/Info.plist";
+				INFOPLIST_KEY_CFBundleDisplayName = "SimpleX Service";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2022 SimpleX Chat. All rights reserved.";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "chat.simplex.app.SimpleX-Service";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = iphoneos;
+				SKIP_INSTALL = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		5C1CAA252847C5C8009E5C72 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_ENTITLEMENTS = "SimpleX Service/SimpleX_Service.entitlements";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = 5NN7GUYB6T;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = "SimpleX Service/Info.plist";
+				INFOPLIST_KEY_CFBundleDisplayName = "SimpleX Service";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2022 SimpleX Chat. All rights reserved.";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "chat.simplex.app.SimpleX-Service";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SDKROOT = iphoneos;
+				SKIP_INSTALL = YES;
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
 		5CA059F1279559F40002BEB4 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
@ -1371,6 +1515,15 @@
 /* End XCBuildConfiguration section */

 /* Begin XCConfigurationList section */
+		5C1CAA262847C5C8009E5C72 /* Build configuration list for PBXNativeTarget "SimpleX Service" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				5C1CAA242847C5C8009E5C72 /* Debug */,
+				5C1CAA252847C5C8009E5C72 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		5CA059C1279559F40002BEB4 /* Build configuration list for PBXProject "SimpleX" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (