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630 lines
29 KiB
Swift
630 lines
29 KiB
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import SignalServiceKit
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import CloudKit
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// We don't worry about atomic writes. Each backup export
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// will diff against last successful backup.
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//
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// Note that all of our CloudKit records are immutable.
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// "Persistent" records are only uploaded once.
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// "Ephemeral" records are always uploaded to a new record name.
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@objc public class OWSBackupAPI: NSObject {
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// If we change the record types, we need to ensure indices
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// are configured properly in the CloudKit dashboard.
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//
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// TODO: Change the record types when we ship to production.
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static let signalBackupRecordType = "signalBackup"
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static let manifestRecordName = "manifest"
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static let payloadKey = "payload"
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static let maxRetries = 5
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private class func recordIdForTest() -> String {
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return "test-\(NSUUID().uuidString)"
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}
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private class func database() -> CKDatabase {
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let myContainer = CKContainer.default()
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let privateDatabase = myContainer.privateCloudDatabase
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return privateDatabase
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}
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private class func invalidServiceResponseError() -> Error {
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return OWSErrorWithCodeDescription(.backupFailure,
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NSLocalizedString("BACKUP_EXPORT_ERROR_INVALID_CLOUDKIT_RESPONSE",
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comment: "Error indicating that the app received an invalid response from CloudKit."))
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}
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// MARK: - Upload
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@objc
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public class func saveTestFileToCloud(fileUrl: URL,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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saveFileToCloud(fileUrl: fileUrl,
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recordName: NSUUID().uuidString,
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recordType: signalBackupRecordType,
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success: success,
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failure: failure)
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}
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// "Ephemeral" files are specific to this backup export and will always need to
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// be saved. For example, a complete image of the database is exported each time.
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// We wouldn't want to overwrite previous images until the entire backup export is
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// complete.
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@objc
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public class func saveEphemeralDatabaseFileToCloud(fileUrl: URL,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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saveFileToCloud(fileUrl: fileUrl,
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recordName: "ephemeralFile-\(NSUUID().uuidString)",
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recordType: signalBackupRecordType,
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success: success,
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failure: failure)
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}
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// "Persistent" files may be shared between backup export; they should only be saved
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// once. For example, attachment files should only be uploaded once. Subsequent
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// backups can reuse the same record.
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@objc
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public class func recordNameForPersistentFile(fileId: String) -> String {
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return "persistentFile-\(fileId)"
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}
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// "Persistent" files may be shared between backup export; they should only be saved
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// once. For example, attachment files should only be uploaded once. Subsequent
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// backups can reuse the same record.
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@objc
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public class func savePersistentFileOnceToCloud(fileId: String,
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fileUrlBlock: @escaping (()) -> URL?,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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saveFileOnceToCloud(recordName: recordNameForPersistentFile(fileId: fileId),
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recordType: signalBackupRecordType,
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fileUrlBlock: fileUrlBlock,
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success: success,
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failure: failure)
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}
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@objc
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public class func upsertManifestFileToCloud(fileUrl: URL,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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// We want to use a well-known record id and type for manifest files.
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upsertFileToCloud(fileUrl: fileUrl,
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recordName: manifestRecordName,
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recordType: signalBackupRecordType,
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success: success,
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failure: failure)
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}
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@objc
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public class func saveFileToCloud(fileUrl: URL,
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recordName: String,
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recordType: String,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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let recordID = CKRecordID(recordName: recordName)
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let record = CKRecord(recordType: recordType, recordID: recordID)
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let asset = CKAsset(fileURL: fileUrl)
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record[payloadKey] = asset
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saveRecordToCloud(record: record,
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success: success,
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failure: failure)
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}
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@objc
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public class func saveRecordToCloud(record: CKRecord,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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saveRecordToCloud(record: record,
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remainingRetries: maxRetries,
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success: success,
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failure: failure)
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}
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private class func saveRecordToCloud(record: CKRecord,
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remainingRetries: Int,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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database().save(record) {
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(_, error) in
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let outcome = outcomeForCloudKitError(error: error,
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remainingRetries: remainingRetries,
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label: "Save Record")
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switch outcome {
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case .success:
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let recordName = record.recordID.recordName
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success(recordName)
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case .failureDoNotRetry(let outcomeError):
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failure(outcomeError)
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case .failureRetryAfterDelay(let retryDelay):
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DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + retryDelay, execute: {
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saveRecordToCloud(record: record,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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})
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case .failureRetryWithoutDelay:
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DispatchQueue.global().async {
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saveRecordToCloud(record: record,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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}
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case .unknownItem:
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owsFail("\(self.logTag) unexpected CloudKit response.")
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failure(invalidServiceResponseError())
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}
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}
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}
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// Compare:
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// * An "upsert" creates a new record if none exists and
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// or updates if there is an existing record.
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// * A "save once" creates a new record if none exists and
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// does nothing if there is an existing record.
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@objc
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public class func upsertFileToCloud(fileUrl: URL,
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recordName: String,
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recordType: String,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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checkForFileInCloud(recordName: recordName,
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remainingRetries: maxRetries,
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success: { (record) in
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if let record = record {
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// Record found, updating existing record.
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let asset = CKAsset(fileURL: fileUrl)
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record[payloadKey] = asset
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saveRecordToCloud(record: record,
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success: success,
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failure: failure)
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} else {
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// No record found, saving new record.
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saveFileToCloud(fileUrl: fileUrl,
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recordName: recordName,
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recordType: recordType,
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success: success,
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failure: failure)
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}
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},
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failure: failure)
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}
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// Compare:
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// * An "upsert" creates a new record if none exists and
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// or updates if there is an existing record.
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// * A "save once" creates a new record if none exists and
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// does nothing if there is an existing record.
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@objc
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public class func saveFileOnceToCloud(recordName: String,
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recordType: String,
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fileUrlBlock: @escaping (()) -> URL?,
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success: @escaping (String) -> Void,
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failure: @escaping (Error) -> Void) {
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checkForFileInCloud(recordName: recordName,
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remainingRetries: maxRetries,
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success: { (record) in
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if record != nil {
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// Record found, skipping save.
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success(recordName)
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} else {
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// No record found, saving new record.
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guard let fileUrl = fileUrlBlock(()) else {
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Logger.error("\(self.logTag) error preparing file for upload.")
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failure(OWSErrorWithCodeDescription(.exportBackupError,
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NSLocalizedString("BACKUP_EXPORT_ERROR_SAVE_FILE_TO_CLOUD_FAILED",
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comment: "Error indicating the backup export failed to save a file to the cloud.")))
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return
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}
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saveFileToCloud(fileUrl: fileUrl,
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recordName: recordName,
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recordType: recordType,
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success: success,
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failure: failure)
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}
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},
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failure: failure)
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}
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// MARK: - Delete
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@objc
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public class func deleteRecordsFromCloud(recordNames: [String],
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success: @escaping (()) -> Void,
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failure: @escaping (Error) -> Void) {
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deleteRecordsFromCloud(recordNames: recordNames,
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remainingRetries: maxRetries,
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success: success,
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failure: failure)
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}
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private class func deleteRecordsFromCloud(recordNames: [String],
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remainingRetries: Int,
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success: @escaping (()) -> Void,
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failure: @escaping (Error) -> Void) {
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let recordIDs = recordNames.map { CKRecordID(recordName: $0) }
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let deleteOperation = CKModifyRecordsOperation(recordsToSave: nil, recordIDsToDelete: recordIDs)
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deleteOperation.modifyRecordsCompletionBlock = { (records, recordIds, error) in
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let outcome = outcomeForCloudKitError(error: error,
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remainingRetries: remainingRetries,
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label: "Delete Records")
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switch outcome {
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case .success:
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success(())
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case .failureDoNotRetry(let outcomeError):
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failure(outcomeError)
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case .failureRetryAfterDelay(let retryDelay):
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DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + retryDelay, execute: {
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deleteRecordsFromCloud(recordNames: recordNames,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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})
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case .failureRetryWithoutDelay:
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DispatchQueue.global().async {
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deleteRecordsFromCloud(recordNames: recordNames,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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}
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case .unknownItem:
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owsFail("\(self.logTag) unexpected CloudKit response.")
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failure(invalidServiceResponseError())
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}
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}
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database().add(deleteOperation)
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}
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// MARK: - Exists?
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private class func checkForFileInCloud(recordName: String,
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remainingRetries: Int,
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success: @escaping (CKRecord?) -> Void,
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failure: @escaping (Error) -> Void) {
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let recordId = CKRecordID(recordName: recordName)
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let fetchOperation = CKFetchRecordsOperation(recordIDs: [recordId ])
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// Don't download the file; we're just using the fetch to check whether or
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// not this record already exists.
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fetchOperation.desiredKeys = []
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fetchOperation.perRecordCompletionBlock = { (record, recordId, error) in
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let outcome = outcomeForCloudKitError(error: error,
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remainingRetries: remainingRetries,
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label: "Check for Record")
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switch outcome {
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case .success:
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guard let record = record else {
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owsFail("\(self.logTag) missing fetching record.")
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failure(invalidServiceResponseError())
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return
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}
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// Record found.
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success(record)
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case .failureDoNotRetry(let outcomeError):
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failure(outcomeError)
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case .failureRetryAfterDelay(let retryDelay):
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DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + retryDelay, execute: {
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checkForFileInCloud(recordName: recordName,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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})
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case .failureRetryWithoutDelay:
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DispatchQueue.global().async {
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checkForFileInCloud(recordName: recordName,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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}
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case .unknownItem:
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// Record not found.
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success(nil)
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}
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}
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database().add(fetchOperation)
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}
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@objc
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public class func checkForManifestInCloud(success: @escaping (Bool) -> Void,
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failure: @escaping (Error) -> Void) {
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checkForFileInCloud(recordName: manifestRecordName,
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remainingRetries: maxRetries,
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success: { (record) in
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success(record != nil)
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},
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failure: failure)
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}
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@objc
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public class func fetchAllRecordNames(success: @escaping ([String]) -> Void,
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failure: @escaping (Error) -> Void) {
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let query = CKQuery(recordType: signalBackupRecordType, predicate: NSPredicate(value: true))
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// Fetch the first page of results for this query.
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fetchAllRecordNamesStep(query: query,
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previousRecordNames: [String](),
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cursor: nil,
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remainingRetries: maxRetries,
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success: success,
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failure: failure)
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}
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private class func fetchAllRecordNamesStep(query: CKQuery,
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previousRecordNames: [String],
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cursor: CKQueryCursor?,
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remainingRetries: Int,
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success: @escaping ([String]) -> Void,
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failure: @escaping (Error) -> Void) {
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var allRecordNames = previousRecordNames
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let queryOperation = CKQueryOperation(query: query)
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// If this isn't the first page of results for this query, resume
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// where we left off.
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queryOperation.cursor = cursor
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// Don't download the file; we're just using the query to get a list of record names.
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queryOperation.desiredKeys = []
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queryOperation.recordFetchedBlock = { (record) in
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assert(record.recordID.recordName.count > 0)
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allRecordNames.append(record.recordID.recordName)
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}
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queryOperation.queryCompletionBlock = { (cursor, error) in
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let outcome = outcomeForCloudKitError(error: error,
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remainingRetries: remainingRetries,
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label: "Fetch All Records")
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switch outcome {
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case .success:
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if let cursor = cursor {
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Logger.verbose("\(self.logTag) fetching more record names \(allRecordNames.count).")
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// There are more pages of results, continue fetching.
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fetchAllRecordNamesStep(query: query,
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previousRecordNames: allRecordNames,
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cursor: cursor,
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remainingRetries: maxRetries,
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success: success,
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failure: failure)
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return
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}
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Logger.info("\(self.logTag) fetched \(allRecordNames.count) record names.")
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success(allRecordNames)
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case .failureDoNotRetry(let outcomeError):
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failure(outcomeError)
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case .failureRetryAfterDelay(let retryDelay):
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DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + retryDelay, execute: {
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fetchAllRecordNamesStep(query: query,
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previousRecordNames: allRecordNames,
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cursor: cursor,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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})
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case .failureRetryWithoutDelay:
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DispatchQueue.global().async {
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fetchAllRecordNamesStep(query: query,
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previousRecordNames: allRecordNames,
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cursor: cursor,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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}
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case .unknownItem:
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owsFail("\(self.logTag) unexpected CloudKit response.")
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failure(invalidServiceResponseError())
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}
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}
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database().add(queryOperation)
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}
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// MARK: - Download
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@objc
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public class func downloadManifestFromCloud(
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success: @escaping (Data) -> Void,
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failure: @escaping (Error) -> Void) {
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downloadDataFromCloud(recordName: manifestRecordName,
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success: success,
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failure: failure)
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}
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@objc
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public class func downloadDataFromCloud(recordName: String,
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success: @escaping (Data) -> Void,
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failure: @escaping (Error) -> Void) {
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downloadFromCloud(recordName: recordName,
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remainingRetries: maxRetries,
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success: { (asset) in
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DispatchQueue.global().async {
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do {
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let data = try Data(contentsOf: asset.fileURL)
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success(data)
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} catch {
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Logger.error("\(self.logTag) couldn't load asset file: \(error).")
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failure(invalidServiceResponseError())
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}
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}
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},
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failure: failure)
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}
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|
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@objc
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public class func downloadFileFromCloud(recordName: String,
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toFileUrl: URL,
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success: @escaping (()) -> Void,
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failure: @escaping (Error) -> Void) {
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downloadFromCloud(recordName: recordName,
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remainingRetries: maxRetries,
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success: { (asset) in
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DispatchQueue.global().async {
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do {
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try FileManager.default.copyItem(at: asset.fileURL, to: toFileUrl)
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success(())
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} catch {
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Logger.error("\(self.logTag) couldn't copy asset file: \(error).")
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failure(invalidServiceResponseError())
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}
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}
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},
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failure: failure)
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}
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// We return the CKAsset and not its fileUrl because
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// CloudKit offers no guarantees around how long it'll
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// keep around the underlying file. Presumably we can
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// defer cleanup by maintaining a strong reference to
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// the asset.
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private class func downloadFromCloud(recordName: String,
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remainingRetries: Int,
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success: @escaping (CKAsset) -> Void,
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failure: @escaping (Error) -> Void) {
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let recordId = CKRecordID(recordName: recordName)
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let fetchOperation = CKFetchRecordsOperation(recordIDs: [recordId ])
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// Download all keys for this record.
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fetchOperation.perRecordCompletionBlock = { (record, recordId, error) in
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let outcome = outcomeForCloudKitError(error: error,
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remainingRetries: remainingRetries,
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label: "Download Record")
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switch outcome {
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case .success:
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guard let record = record else {
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Logger.error("\(self.logTag) missing fetching record.")
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failure(invalidServiceResponseError())
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return
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}
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guard let asset = record[payloadKey] as? CKAsset else {
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Logger.error("\(self.logTag) record missing payload.")
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failure(invalidServiceResponseError())
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return
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}
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success(asset)
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case .failureDoNotRetry(let outcomeError):
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failure(outcomeError)
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case .failureRetryAfterDelay(let retryDelay):
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DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + retryDelay, execute: {
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downloadFromCloud(recordName: recordName,
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remainingRetries: remainingRetries - 1,
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success: success,
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failure: failure)
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})
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case .failureRetryWithoutDelay:
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DispatchQueue.global().async {
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|
downloadFromCloud(recordName: recordName,
|
|
remainingRetries: remainingRetries - 1,
|
|
success: success,
|
|
failure: failure)
|
|
}
|
|
case .unknownItem:
|
|
Logger.error("\(self.logTag) missing fetching record.")
|
|
failure(invalidServiceResponseError())
|
|
}
|
|
}
|
|
database().add(fetchOperation)
|
|
}
|
|
|
|
// MARK: - Access
|
|
|
|
@objc
|
|
public class func checkCloudKitAccess(completion: @escaping (Bool) -> Void) {
|
|
CKContainer.default().accountStatus(completionHandler: { (accountStatus, error) in
|
|
DispatchQueue.main.async {
|
|
switch accountStatus {
|
|
case .couldNotDetermine:
|
|
Logger.error("\(self.logTag) could not determine CloudKit account status:\(String(describing: error)).")
|
|
OWSAlerts.showErrorAlert(message: NSLocalizedString("CLOUDKIT_STATUS_COULD_NOT_DETERMINE", comment: "Error indicating that the app could not determine that user's CloudKit account status"))
|
|
completion(false)
|
|
case .noAccount:
|
|
Logger.error("\(self.logTag) no CloudKit account.")
|
|
OWSAlerts.showErrorAlert(message: NSLocalizedString("CLOUDKIT_STATUS_NO_ACCOUNT", comment: "Error indicating that user does not have an iCloud account."))
|
|
completion(false)
|
|
case .restricted:
|
|
Logger.error("\(self.logTag) restricted CloudKit account.")
|
|
OWSAlerts.showErrorAlert(message: NSLocalizedString("CLOUDKIT_STATUS_RESTRICTED", comment: "Error indicating that the app was prevented from accessing the user's CloudKit account."))
|
|
completion(false)
|
|
case .available:
|
|
completion(true)
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
// MARK: - Retry
|
|
|
|
private enum APIOutcome {
|
|
case success
|
|
case failureDoNotRetry(error:Error)
|
|
case failureRetryAfterDelay(retryDelay: TimeInterval)
|
|
case failureRetryWithoutDelay
|
|
// This only applies to fetches.
|
|
case unknownItem
|
|
}
|
|
|
|
private class func outcomeForCloudKitError(error: Error?,
|
|
remainingRetries: Int,
|
|
label: String) -> APIOutcome {
|
|
if let error = error as? CKError {
|
|
if error.code == CKError.unknownItem {
|
|
// This is not always an error for our purposes.
|
|
Logger.verbose("\(self.logTag) \(label) unknown item.")
|
|
return .unknownItem
|
|
}
|
|
|
|
Logger.error("\(self.logTag) \(label) failed: \(error)")
|
|
|
|
if remainingRetries < 1 {
|
|
Logger.verbose("\(self.logTag) \(label) no more retries.")
|
|
return .failureDoNotRetry(error:error)
|
|
}
|
|
|
|
if #available(iOS 11, *) {
|
|
if error.code == CKError.serverResponseLost {
|
|
Logger.verbose("\(self.logTag) \(label) retry without delay.")
|
|
return .failureRetryWithoutDelay
|
|
}
|
|
}
|
|
|
|
switch error {
|
|
case CKError.requestRateLimited, CKError.serviceUnavailable, CKError.zoneBusy:
|
|
let retryDelay = error.retryAfterSeconds ?? 3.0
|
|
Logger.verbose("\(self.logTag) \(label) retry with delay: \(retryDelay).")
|
|
return .failureRetryAfterDelay(retryDelay:retryDelay)
|
|
case CKError.networkFailure:
|
|
Logger.verbose("\(self.logTag) \(label) retry without delay.")
|
|
return .failureRetryWithoutDelay
|
|
default:
|
|
Logger.verbose("\(self.logTag) \(label) unknown CKError.")
|
|
return .failureDoNotRetry(error:error)
|
|
}
|
|
} else if let error = error {
|
|
Logger.error("\(self.logTag) \(label) failed: \(error)")
|
|
if remainingRetries < 1 {
|
|
Logger.verbose("\(self.logTag) \(label) no more retries.")
|
|
return .failureDoNotRetry(error:error)
|
|
}
|
|
Logger.verbose("\(self.logTag) \(label) unknown error.")
|
|
return .failureDoNotRetry(error:error)
|
|
} else {
|
|
Logger.info("\(self.logTag) \(label) succeeded.")
|
|
return .success
|
|
}
|
|
}
|
|
}
|