Amir Abbas Mousavian
335 lines
16 KiB
Swift
335 lines
16 KiB
Swift
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//
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// DropboxFileProvider.swift
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// FileProvider
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//
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// Created by Amir Abbas Mousavian.
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// Copyright © 2016 Mousavian. Distributed under MIT license.
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//
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import Foundation
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import CoreGraphics
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// Because this class uses NSURLSession, it's necessary to disable App Transport Security
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// in case of using this class with unencrypted HTTP connection.
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open class DropboxFileProvider: NSObject, FileProviderBasic {
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open static let type: String = "WebDAV"
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open let isPathRelative: Bool = true
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open let baseURL: URL?
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open var currentPath: String = ""
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open var dispatch_queue: DispatchQueue {
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willSet {
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assert(_session == nil, "It's not effective to change dispatch_queue property after session is initialized.")
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}
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}
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open weak var delegate: FileProviderDelegate?
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open let credential: URLCredential?
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fileprivate var _session: URLSession?
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fileprivate var sessionDelegate: SessionDelegate?
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internal var session: URLSession {
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if _session == nil {
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self.sessionDelegate = SessionDelegate(fileProvider: self, credential: credential)
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let queue = OperationQueue()
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//queue.underlyingQueue = dispatch_queue
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_session = URLSession(configuration: URLSessionConfiguration.default, delegate: sessionDelegate as URLSessionDelegate?, delegateQueue: queue)
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}
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return _session!
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}
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public init? (credential: URLCredential?) {
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self.baseURL = nil
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dispatch_queue = DispatchQueue(label: "FileProvider.\(DropboxFileProvider.type)", attributes: DispatchQueue.Attributes.concurrent)
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//let url = baseURL.uw_absoluteString
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self.credential = credential
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}
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deinit {
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_session?.invalidateAndCancel()
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}
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open func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
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list(path) { (contents, cursor, error) in
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completionHandler(contents, error)
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}
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}
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open func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
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let url = URL(string: "https://api.dropboxapi.com/2/files/get_metadata")!
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var request = URLRequest(url: url)
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request.httpMethod = "POST"
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request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
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request.setValue("application/json", forHTTPHeaderField: "Content-Type")
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let requestDictionary = ["path": correctPath(path)! as NSString]
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request.httpBody = dictionaryToJSON(requestDictionary)?.data(using: String.Encoding.utf8)
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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if let response = response as? HTTPURLResponse {
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defer {
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self.delegateNotify(FileOperation.create(path: path), error: error)
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}
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let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
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let dbError: FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: String.Encoding.utf8)) : nil
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if let data = data, let jsonStr = String(data: data, encoding: String.Encoding.utf8), let json = jsonToDictionary(jsonStr), let file = self.mapToFileObject(json) {
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completionHandler(file, dbError)
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return
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}
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completionHandler(nil, dbError)
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return
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}
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completionHandler(nil, error)
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})
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task.resume()
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}
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open func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
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let url = URL(string: "https://api.dropboxapi.com/2/users/get_space_usage")!
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var request = URLRequest(url: url)
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request.httpMethod = "POST"
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request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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if let data = data, let jsonStr = String(data: data, encoding: String.Encoding.utf8), let json = jsonToDictionary(jsonStr) {
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let totalSize = ((json["allocation"] as? NSDictionary)?["allocated"] as? NSNumber)?.int64Value ?? -1
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let usedSize = (json["used"] as? NSNumber)?.int64Value ?? 0
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completionHandler(totalSize, usedSize)
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return
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}
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completionHandler(-1, 0)
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})
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task.resume()
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}
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open weak var fileOperationDelegate: FileOperationDelegate?
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}
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extension DropboxFileProvider: FileProviderOperations {
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public func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) {
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let path = (atPath as NSString).appendingPathComponent(folderName) + "/"
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doOperation(.create(path: path), completionHandler: completionHandler)
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}
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public func create(file fileAttribs: FileObject, at path: String, contents data: Data?, completionHandler: SimpleCompletionHandler) {
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self.writeContents(path: path, contents: data ?? Data(), completionHandler: completionHandler)
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}
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public func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) {
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doOperation(.move(source: path, destination: toPath), completionHandler: completionHandler)
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}
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public func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) {
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doOperation(.copy(source: path, destination: toPath), completionHandler: completionHandler)
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}
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public func removeItem(path: String, completionHandler: SimpleCompletionHandler) {
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doOperation(.remove(path: path), completionHandler: completionHandler)
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}
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fileprivate func doOperation(_ operation: FileOperation, completionHandler: SimpleCompletionHandler) {
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let url: String
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var path: String?, fromPath: String?, toPath: String?
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switch operation {
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case .create(path: let p):
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url = "https://api.dropboxapi.com/2/files/create_folder"
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path = p
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case .copy(source: let fp, destination: let tp):
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url = "https://api.dropboxapi.com/2/files/copy"
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fromPath = fp
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toPath = tp
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case .move(source: let fp, destination: let tp):
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url = "https://api.dropboxapi.com/2/files/move"
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fromPath = fp
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toPath = tp
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case .modify(path: let p):
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return
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case .remove(path: let p):
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url = "https://api.dropboxapi.com/2/files/delete"
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path = p
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case .link(link: _, target: _):
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return
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}
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var request = URLRequest(url: URL(string: url)!)
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request.httpMethod = "POST"
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request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
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request.setValue("application/json", forHTTPHeaderField: "Content-Type")
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var requestDictionary = [String: AnyObject]()
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requestDictionary["path"] = correctPath(path) as NSString?
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requestDictionary["from_path"] = correctPath(fromPath) as NSString?
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requestDictionary["to_path"] = correctPath(toPath) as NSString?
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request.httpBody = dictionaryToJSON(requestDictionary)?.data(using: String.Encoding.utf8)
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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if let response = response as? HTTPURLResponse {
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let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
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let dbError: FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path ?? fromPath ?? "", errorDescription: String(data: data ?? Data(), encoding: String.Encoding.utf8)) : nil
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defer {
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self.delegateNotify(operation, error: error ?? dbError)
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}
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/*if let data = data, let jsonStr = String(data: data, encoding: NSUTF8StringEncoding) {
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let json = self.jsonToDictionary(jsonStr)
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}*/
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completionHandler?(dbError)
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return
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}
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completionHandler?(error)
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})
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task.resume()
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}
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public func copyItem(localFile: URL, to toPath: String, completionHandler: SimpleCompletionHandler) {
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guard let data = try? Data(contentsOf: localFile) else {
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let error = throwError(localFile.uw_absoluteString, code: URLError.fileDoesNotExist as FoundationErrorEnum)
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completionHandler?(error)
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return
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}
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upload_simple(toPath, data: data, overwrite: true, operation: .copy(source: localFile.uw_absoluteString, destination: toPath), completionHandler: completionHandler)
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}
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public func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) {
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let url = URL(string: "https://content.dropboxapi.com/2/files/download")!
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
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request.setValue("application/json", forHTTPHeaderField: "Content-Type")
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let requestDictionary = ["path": path as NSString]
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request.setValue(dictionaryToJSON(requestDictionary), forHTTPHeaderField: "Dropbox-API-Arg")
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let task = session.downloadTask(with: request, completionHandler: { (cacheURL, response, error) in
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guard let cacheURL = cacheURL, let httpResponse = response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
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let code = FileProviderHTTPErrorCode(rawValue: (response as? HTTPURLResponse)?.statusCode ?? -1)
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let dbError: FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: nil) : nil
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completionHandler?(dbError ?? error)
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return
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}
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do {
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try FileManager.default.moveItem(at: cacheURL, to: destURL)
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completionHandler?(nil)
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} catch let e {
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completionHandler?(e)
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}
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})
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task.taskDescription = dictionaryToJSON(["type": "Copy" as NSString, "source": path as NSString, "dest": destURL.uw_absoluteString as NSString])
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task.resume()
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}
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}
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extension DropboxFileProvider: FileProviderReadWrite {
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public func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) {
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self.contents(path: path, offset: 0, length: -1, completionHandler: completionHandler)
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}
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public func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) {
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let url = URL(string: "https://content.dropboxapi.com/2/files/download")!
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
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if length > 0 {
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request.setValue("bytes=\(offset)-\(offset + length)", forHTTPHeaderField: "Range")
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} else if offset > 0 && length < 0 {
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request.setValue("bytes=\(offset)-", forHTTPHeaderField: "Range")
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}
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let requestDictionary = ["path": path]
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request.setValue(dictionaryToJSON(requestDictionary as [String : AnyObject]), forHTTPHeaderField: "Dropbox-API-Arg")
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let task = session.dataTask(with: request, completionHandler: { (datam, response, error) in
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guard let data = datam, let httpResponse = response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
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let code = FileProviderHTTPErrorCode(rawValue: (response as? HTTPURLResponse)?.statusCode ?? -1)
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let dbError: FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: datam ?? Data(), encoding: String.Encoding.utf8)) : nil
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completionHandler(nil, dbError ?? error)
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return
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}
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completionHandler(data, error)
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})
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task.resume()
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}
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public func writeContents(path: String, contents data: Data, atomically: Bool = false, completionHandler: SimpleCompletionHandler) {
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// FIXME: remove 150MB restriction
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upload_simple(path, data: data, overwrite: true, operation: .modify(path: path), completionHandler: completionHandler)
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}
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public func searchFiles(path: String, recursive: Bool, query: String, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
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var foundFiles = [DropboxFileObject]()
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search(path, query: query, foundItem: { (file) in
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foundFiles.append(file)
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foundItemHandler?(file)
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}, completionHandler: { (error) in
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completionHandler(foundFiles, error)
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})
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}
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fileprivate func registerNotifcation(path: String, eventHandler: (() -> Void)) {
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/* There is two ways to monitor folders changing in Dropbox. Either using webooks
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* which means you have to implement a server to translate it to push notifications
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* or using apiv2 list_folder/longpoll method. The second one is implemeted here.
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* Tough webhooks are much more efficient, longpoll is much simpler to implement!
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* You can implemnt your own webhook service and replace this method accordingly.
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*/
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NotImplemented()
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}
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fileprivate func unregisterNotifcation(path: String) {
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NotImplemented()
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}
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// TODO: Implement /copy_reference, /get_temporary_link, /save_url, /get_account & /get_current_account
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}
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extension DropboxFileProvider: ExtendedFileProvider {
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public func thumbnailOfFileSupported(path: String) -> Bool {
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switch (path as NSString).pathExtension.lowercased() {
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case "jpg", "jpeg", "gif", "bmp", "png", "tif", "tiff":
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return true
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/*case "doc", "docx", "docm", "xls", "xlsx", "xlsm":
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return true
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case "ppt", "pps", "ppsx", "ppsm", "pptx", "pptm":
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return true
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case "rtf":
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return true*/
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default:
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return false
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}
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}
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public func propertiesOfFileSupported(path: String) -> Bool {
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return false
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}
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public func thumbnailOfFile(path: String, dimension: CGSize, completionHandler: @escaping ((_ image: ImageClass?, _ error: Error?) -> Void)) {
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let url: URL
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switch (path as NSString).pathExtension.lowercased() {
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case "jpg", "jpeg", "gif", "bmp", "png", "tif", "tiff":
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url = URL(string: "https://content.dropboxapi.com/2/files/get_thumbnail")!
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/*case "doc", "docx", "docm", "xls", "xlsx", "xlsm":
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fallthrough
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case "ppt", "pps", "ppsx", "ppsm", "pptx", "pptm":
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fallthrough
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case "rtf":
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url = NSURL(string: "https://content.dropboxapi.com/2/files/get_preview")!*/
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default:
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return
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}
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var request = URLRequest(url: url)
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request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
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var requestDictionary = ["path": path as NSString]
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requestDictionary["format"] = "jpeg" as NSString
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requestDictionary["size"] = "w\(Int(dimension.width))h\(Int(dimension.height))" as NSString
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request.setValue(dictionaryToJSON(requestDictionary), forHTTPHeaderField: "Dropbox-API-Arg")
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self.session.dataTask(with: request, completionHandler: { (data, response, error) in
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var image: ImageClass? = nil
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if let r = response as? HTTPURLResponse, let result = r.allHeaderFields["Dropbox-API-Result"] as? String, let jsonResult = jsonToDictionary(result) {
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if jsonResult["error"] != nil {
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completionHandler(nil, self.throwError(path, code: URLError.cannotDecodeRawData as FoundationErrorEnum))
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}
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}
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if let data = data {
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image = ImageClass(data: data)
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}
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completionHandler(image, error)
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})
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}
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public func propertiesOfFile(path: String, completionHandler: @escaping ((_ propertiesDictionary: [String : Any], _ keys: [String], _ error: Error?) -> Void)) {
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NotImplemented()
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}
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}
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extension DropboxFileProvider: FileProvider {}
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