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+//
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+// NCEndToEndMetadata.swift
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+// Nextcloud
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+//
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+// Created by Marino Faggiana on 13/11/17.
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+// Copyright © 2017 TWS. All rights reserved.
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+//
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+// Author Marino Faggiana <m.faggiana@twsweb.it>
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+//
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+// This program is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// This program is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU General Public License for more details.
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+//
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+// You should have received a copy of the GNU General Public License
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+// along with this program. If not, see <http://www.gnu.org/licenses/>.
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+//
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+
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+import Foundation
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+
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+class NCEndToEndMetadata : NSObject {
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+
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+ struct e2eMetadata: Codable {
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+
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+ struct metadataKey: Codable {
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+
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+ let metadataKeys: [String: String]
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+ let version: Int
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+ }
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+
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+ struct sharingKey: Codable {
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+
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+ let recipient: [String: String]
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+ }
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+
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+ struct encrypted: Codable {
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+
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+ let key: String
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+ let filename: String
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+ let mimetype: String
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+ let version: Int
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+ }
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+
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+ struct filesKey: Codable {
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+
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+ let initializationVector: String
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+ let authenticationTag: String
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+ let metadataKey: Int
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+ let encrypted: String
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+ }
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+
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+ let files: [String: filesKey]
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+ let metadata: metadataKey
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+ let sharing: sharingKey?
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+ }
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+
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+ @objc static let sharedInstance: NCEndToEndMetadata = {
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+ let instance = NCEndToEndMetadata()
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+ return instance
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+ }()
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+
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+ // let dataDecoded : NSData = NSData(base64Encoded: encrypted, options: NSData.Base64DecodingOptions(rawValue: 0))!
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+ @objc func decoderMetadata(_ e2eMetaDataJSON: String, privateKey: String, serverUrl: String, account: String) -> String? {
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+
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+ let jsonDecoder = JSONDecoder.init()
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+ let data = e2eMetaDataJSON.data(using: .utf8)
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+
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+ do {
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+
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+ let decode = try jsonDecoder.decode(e2eMetadata.self, from: data!)
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+
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+ let files = decode.files
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+ let metadata = decode.metadata
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+ //let sharing = decode.sharing ---> V 2.0
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+
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+ var decodeMetadataKeys = [String:String]()
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+
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+ for metadataKeys in metadata.metadataKeys {
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+
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+ guard let metadataKeysData : NSData = NSData(base64Encoded: metadataKeys.value, options: NSData.Base64DecodingOptions(rawValue: 0)) else {
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+ return "Serious internal error in decoding metadata"
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+ }
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+
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+ guard let metadataKey = NCEndToEndEncryption.sharedManager().decryptAsymmetricData(metadataKeysData as Data!, privateKey: privateKey) else {
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+ return "Serious internal error in decoding metadata"
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+ }
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+
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+ // Encode to Base64
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+ let metadataKeyData = Data(base64Encoded: metadataKey, options: NSData.Base64DecodingOptions(rawValue: 0))!
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+ let metadataKeyBase64 = String(data: metadataKeyData, encoding: .utf8)
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+
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+ decodeMetadataKeys[metadataKeys.key] = metadataKeyBase64
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+ }
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+
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+ for file in files {
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+
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+ let fileNameIdentifier = file.key
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+ let elementOfFile = file.value as e2eMetadata.filesKey
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+
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+ let encrypted = elementOfFile.encrypted
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+ let key = decodeMetadataKeys["\(elementOfFile.metadataKey)"]
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+
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+ guard let decyptedMetadata = NCEndToEndEncryption.sharedManager().decryptMetadata(encrypted, key: key) else {
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+ return "Serious internal error in decoding metadata"
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+ }
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+
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+ do {
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+
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+ let decode = try jsonDecoder.decode(e2eMetadata.encrypted.self, from: decyptedMetadata.data(using: .utf8)!)
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+
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+ let object = tableE2eEncryption()
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+
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+ object.account = account
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+ object.authenticationTag = elementOfFile.authenticationTag
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+ object.fileName = decode.filename
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+ object.fileNameIdentifier = fileNameIdentifier
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+ object.key = decode.key
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+ object.initializationVector = elementOfFile.initializationVector
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+ object.mimeType = decode.mimetype
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+ object.serverUrl = serverUrl
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+ object.version = decode.version
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+
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+ // Write file parameter for decrypted on DB
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+ if NCManageDatabase.sharedInstance.addE2eEncryption(object) == false {
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+ return "Serious internal write DB"
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+ }
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+
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+ // Write e2eMetaDataJSON on DB
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+ if NCManageDatabase.sharedInstance.setDirectoryE2EMetadataJSON(serverUrl: serverUrl, metadata: e2eMetaDataJSON) == false {
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+ return "Serious internal write DB"
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+ }
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+
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+ } catch let error {
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+ return "Serious internal error in decoding metadata ("+error.localizedDescription+")"
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+ }
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+ }
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+
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+ } catch let error {
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+ return "Serious internal error in decoding metadata ("+error.localizedDescription+")"
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+ }
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+
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+ return nil
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+ }
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+}
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Marino Faggiana