Amir Abbas Mousavian
526 lines
25 KiB
Swift
526 lines
25 KiB
Swift
//
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// WebDAVFileProvider.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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fileprivate func < <T : Comparable>(lhs: T?, rhs: T?) -> Bool {
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switch (lhs, rhs) {
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case let (l?, r?):
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return l < r
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case (nil, _?):
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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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fileprivate func >= <T : Comparable>(lhs: T?, rhs: T?) -> Bool {
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switch (lhs, rhs) {
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case let (l?, r?):
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return l >= r
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default:
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return !(lhs < rhs)
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}
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}
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public final class WebDavFileObject: FileObject {
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public let contentType: String
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public let entryTag: String?
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// codebeat:disable[ARITY]
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public init(absoluteURL: URL, name: String, path: String, size: Int64 = -1, contentType: String = "", createdDate: Date? = nil, modifiedDate: Date? = nil, fileType: FileType = .regular, isHidden: Bool = false, isReadOnly: Bool = false, entryTag: String? = nil) {
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self.contentType = contentType
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self.entryTag = entryTag
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super.init(absoluteURL: absoluteURL, name: name, path: path, size: size, createdDate: createdDate, modifiedDate: modifiedDate, fileType: fileType, isHidden: isHidden, isReadOnly: isReadOnly)
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}
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// codebeat:enable[ARITY]
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}
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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 WebDAVFileProvider: NSObject, FileProviderBasic {
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open 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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fileprivate 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 URLSessionDownloadDelegate?, delegateQueue: queue)
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}
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return _session!
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}
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public init? (baseURL: URL, credential: URLCredential?) {
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if !["http", "https"].contains(baseURL.uw_scheme.lowercased()) {
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return nil
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}
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self.baseURL = baseURL
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dispatch_queue = DispatchQueue(label: "FileProvider.\(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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let url = absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "PROPFIND"
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request.setValue("1", forHTTPHeaderField: "Depth")
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request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
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request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/></D:propfind>".data(using: String.Encoding.utf8)
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request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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if let data = data {
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let xresponse = self.parseXMLResponse(data)
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var fileObjects = [WebDavFileObject]()
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for attr in xresponse {
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if attr.href.path == url.path {
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continue
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}
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fileObjects.append(self.mapToFileObject(attr))
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}
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completionHandler(fileObjects, responseError ?? error)
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return
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}
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completionHandler([], responseError ?? error)
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})
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task.resume()
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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 = absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "PROPFIND"
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request.setValue("1", forHTTPHeaderField: "Depth")
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request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
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request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/></D:propfind>".data(using: String.Encoding.utf8)
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request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode, code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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if let data = data {
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let xresponse = self.parseXMLResponse(data)
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if let attr = xresponse.first {
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completionHandler(self.mapToFileObject(attr), responseError ?? error)
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return
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}
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}
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completionHandler(nil, responseError ?? 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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// Not all WebDAV clients implements RFC2518 which allows geting storage quota.
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// In this case you won't get error. totalSize is NSURLSessionTransferSizeUnknown
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// and used space is zero.
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guard let baseURL = baseURL else {
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return
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}
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var request = URLRequest(url: baseURL)
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request.httpMethod = "PROPFIND"
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request.setValue("0", forHTTPHeaderField: "Depth")
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request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
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request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop><D:quota-available-bytes/><D:quota-used-bytes/></D:prop>\n</D:propfind>".data(using: String.Encoding.utf8)
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request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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if let data = data {
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let xresponse = self.parseXMLResponse(data)
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if let attr = xresponse.first {
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let totalSize = Int64(attr.prop["quota-available-bytes"] ?? "")
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let usedSize = Int64(attr.prop["quota-used-bytes"] ?? "")
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completionHandler(totalSize ?? -1, usedSize ?? 0)
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return
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}
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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 WebDAVFileProvider: FileProviderOperations {
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public func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) {
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let url = absoluteURL((atPath as NSString).appendingPathComponent(folderName) + "/")
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var request = URLRequest(url: url)
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request.httpMethod = "MKCOL"
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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if let response = response as? HTTPURLResponse, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) , code != .ok {
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completionHandler?(FileProviderWebDavError(code: code, url: url))
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return
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}
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completionHandler?(responseError ?? error)
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self.delegateNotify(.create(path: (atPath as NSString).appendingPathComponent(folderName) + "/"), error: responseError ?? error)
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})
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task.resume()
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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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let url = absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "PUT"
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let task = session.uploadTask(with: request, from: data, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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completionHandler?(responseError ?? error)
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self.delegateNotify(.create(path: (path as NSString).appendingPathComponent(fileAttribs.name)), error: responseError ?? error)
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})
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task.taskDescription = dictionaryToJSON(["type": "Create" as NSString, "source": (path as NSString).appendingPathComponent(fileAttribs.name) as NSString])
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task.resume()
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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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self.copyMoveItem(move: true, path: path, toPath: toPath, overwrite: overwrite, 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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self.copyMoveItem(move: false, path: path, toPath: toPath, overwrite: overwrite, completionHandler: completionHandler)
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}
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fileprivate func copyMoveItem(move:Bool, path: String, toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) {
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let url = absoluteURL(path)
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var request = URLRequest(url: url)
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if move {
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request.httpMethod = "MOVE"
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} else {
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request.httpMethod = "COPY"
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}
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request.setValue(absoluteURL(path).uw_absoluteString, forHTTPHeaderField: "Destination")
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if !overwrite {
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request.setValue("F", forHTTPHeaderField: "Overwrite")
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}
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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, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) {
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defer {
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let op = move ? FileOperation.move(source: path, destination: toPath) : .copy(source: path, destination: toPath)
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self.delegateNotify(op, error: error)
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}
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if code == .multiStatus, let data = data {
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let xresponses = self.parseXMLResponse(data)
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for xresponse in xresponses where xresponse.status >= 300 {
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completionHandler?(FileProviderWebDavError(code: code, url: url))
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}
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} else {
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completionHandler?(FileProviderWebDavError(code: code, url: url))
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}
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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 removeItem(path: String, completionHandler: SimpleCompletionHandler) {
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let url = absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "DELETE"
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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, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) {
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defer {
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self.delegateNotify(.remove(path: path), error: error)
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}
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if code == .multiStatus, let data = data {
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let xresponses = self.parseXMLResponse(data)
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for xresponse in xresponses where xresponse.status >= 300 {
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completionHandler?(FileProviderWebDavError(code: code, url: url))
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}
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} else {
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completionHandler?(FileProviderWebDavError(code: code, url: url))
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}
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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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let url = absoluteURL(toPath)
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var request = URLRequest(url: url)
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request.httpMethod = "PUT"
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let task = session.uploadTask(with: request, fromFile: localFile, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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completionHandler?(responseError ?? error)
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self.delegateNotify(.move(source: localFile.uw_absoluteString, destination: toPath), error: responseError ?? error)
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})
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task.taskDescription = dictionaryToJSON(["type": "Copy" as NSString, "source": localFile.uw_absoluteString as NSString, "dest": toPath as NSString])
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task.resume()
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}
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public func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) {
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let url = absoluteURL(path)
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let request = URLRequest(url: url)
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let task = session.downloadTask(with: request, completionHandler: { (sourceFileURL, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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if let sourceFileURL = sourceFileURL {
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do {
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try FileManager.default.copyItem(at: sourceFileURL, to: toLocalURL)
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} catch let e {
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completionHandler?(e)
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return
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}
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}
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completionHandler?(responseError ?? error)
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})
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task.taskDescription = dictionaryToJSON(["type": "Copy" as NSString, "source": path as NSString, "dest": toLocalURL.uw_absoluteString as NSString])
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task.resume()
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}
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}
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extension WebDAVFileProvider: 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 = absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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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 task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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completionHandler(data, responseError ?? 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: lock destination before writing process
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let url = atomically ? absoluteURL(path).uw_URLByAppendingPathExtension("tmp") : absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "PUT"
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let task = session.uploadTask(with: request, from: data, completionHandler: { (data, response, error) in
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: self.absoluteURL(path))
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}
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defer {
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self.delegateNotify(.modify(path: path), error: responseError ?? error)
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}
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if let error = error {
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completionHandler?(error)
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return
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}
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if atomically {
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self.moveItem(path: (path as NSString).appendingPathExtension("tmp")!, to: path, completionHandler: completionHandler)
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}
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})
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task.taskDescription = dictionaryToJSON(["type": "Modify" as NSString, "source": path as NSString])
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task.resume()
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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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let url = absoluteURL(path)
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var request = URLRequest(url: url)
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request.httpMethod = "PROPFIND"
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//request.setValue("1", forHTTPHeaderField: "Depth")
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request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
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request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/></D:propfind>".data(using: String.Encoding.utf8)
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request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
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let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
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// FIXME: paginating results
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var responseError: FileProviderWebDavError?
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if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
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responseError = FileProviderWebDavError(code: rCode, url: url)
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}
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if let data = data {
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let xresponse = self.parseXMLResponse(data)
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var fileObjects = [WebDavFileObject]()
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for attr in xresponse {
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let path = attr.href.path
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if !((path as NSString).lastPathComponent.contains(query)) {
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continue
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}
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let fileObject = self.mapToFileObject(attr)
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fileObjects.append(fileObject)
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foundItemHandler?(fileObject)
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}
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completionHandler(fileObjects, responseError ?? error)
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return
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}
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completionHandler([], responseError ?? error)
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})
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task.resume()
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}
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fileprivate func registerNotifcation(path: String, eventHandler: (() -> Void)) {
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/* There is no unified api for monitoring WebDAV server content change/update
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* Microsoft Exchange uses SUBSCRIBE method, Apple uses push notification system.
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* while both is unavailable in a mobile platform.
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* A messy approach is listing a directory with an interval period and compare
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* with previous results
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*/
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}
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fileprivate func unregisterNotifcation(path: String) {
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}
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// TODO: implements methods for lock mechanism
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}
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extension WebDAVFileProvider: FileProvider {}
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// MARK: WEBDAV XML response implementation
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internal extension WebDAVFileProvider {
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struct DavResponse {
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let href: URL
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let hrefString: String
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let status: Int?
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let prop: [String: String]
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}
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fileprivate func parseXMLResponse(_ response: Data) -> [DavResponse] {
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var result = [DavResponse]()
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do {
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let xml = try AEXMLDocument(xml: response)
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var rootnode = xml.root
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var responsetag = "response"
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for node in rootnode.all ?? [] where node.name.lowercased().hasSuffix("multistatus") {
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rootnode = node
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}
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for node in rootnode.children where node.name.lowercased().hasSuffix("response") {
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responsetag = node.name
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break
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}
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for responseNode in rootnode[responsetag].all ?? [] {
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if let davResponse = mapNodeToDavResponse(responseNode) {
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|
result.append(davResponse)
|
|
}
|
|
}
|
|
} catch _ {
|
|
}
|
|
return result
|
|
}
|
|
|
|
fileprivate func mapNodeToDavResponse(_ node: AEXMLElement) -> DavResponse? {
|
|
var hreftag = "href"
|
|
var statustag = "status"
|
|
var propstattag = "propstat"
|
|
for node in node.children {
|
|
if node.name.lowercased().hasSuffix("href") {
|
|
hreftag = node.name
|
|
}
|
|
if node.name.lowercased().hasSuffix("status") {
|
|
statustag = node.name
|
|
}
|
|
if node.name.lowercased().hasSuffix("propstat") {
|
|
propstattag = node.name
|
|
}
|
|
}
|
|
let href = node[hreftag].value
|
|
if let href = href, let hrefURL = URL(string: href) {
|
|
var status: Int?
|
|
let statusDesc = (node[statustag].string).components(separatedBy: " ")
|
|
if statusDesc.count > 2 {
|
|
status = Int(statusDesc[1])
|
|
}
|
|
var propDic = [String: String]()
|
|
let propStatNode = node[propstattag]
|
|
for node in propStatNode.children where node.name.lowercased().hasSuffix("status"){
|
|
statustag = node.name
|
|
break
|
|
}
|
|
let statusDesc2 = (propStatNode[statustag].string).components(separatedBy: " ")
|
|
if statusDesc2.count > 2 {
|
|
status = Int(statusDesc2[1])
|
|
}
|
|
var proptag = "prop"
|
|
for tnode in propStatNode.children where tnode.name.lowercased().hasSuffix("prop") {
|
|
proptag = tnode.name
|
|
break
|
|
}
|
|
for propItemNode in propStatNode[proptag].children {
|
|
propDic[propItemNode.name.components(separatedBy: ":").last!.lowercased()] = propItemNode.value
|
|
if propItemNode.name.hasSuffix("resourcetype") && propItemNode.xml.contains("collection") {
|
|
propDic["getcontenttype"] = "httpd/unix-directory"
|
|
}
|
|
}
|
|
return DavResponse(href: hrefURL, hrefString: href, status: status, prop: propDic)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
fileprivate func mapToFileObject(_ davResponse: DavResponse) -> WebDavFileObject {
|
|
var href = davResponse.href
|
|
if href.baseURL == nil {
|
|
href = absoluteURL(href.path)
|
|
}
|
|
let name = davResponse.prop["displayname"] ?? (davResponse.hrefString.removingPercentEncoding! as NSString).lastPathComponent
|
|
let size = Int64(davResponse.prop["getcontentlength"] ?? "-1") ?? NSURLSessionTransferSizeUnknown
|
|
let createdDate = self.resolve(dateString: davResponse.prop["creationdate"] ?? "")
|
|
let modifiedDate = self.resolve(dateString: davResponse.prop["getlastmodified"] ?? "")
|
|
let contentType = davResponse.prop["getcontenttype"] ?? "octet/stream"
|
|
let isDirectory = contentType == "httpd/unix-directory"
|
|
let entryTag = davResponse.prop["getetag"]
|
|
return WebDavFileObject(absoluteURL: href, name: name, path: href.path, size: size, contentType: contentType, createdDate: createdDate, modifiedDate: modifiedDate, fileType: isDirectory ? .directory : .regular, isHidden: false, isReadOnly: false, entryTag: entryTag)
|
|
}
|
|
|
|
fileprivate func delegateNotify(_ operation: FileOperation, error: Error?) {
|
|
DispatchQueue.main.async(execute: {
|
|
if error == nil {
|
|
self.delegate?.fileproviderSucceed(self, operation: operation)
|
|
} else {
|
|
self.delegate?.fileproviderFailed(self, operation: operation)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
public struct FileProviderWebDavError: Error, CustomStringConvertible {
|
|
public let code: FileProviderHTTPErrorCode
|
|
public let url: URL
|
|
|
|
public var description: String {
|
|
return code.description
|
|
}
|
|
}
|