Upload a file via FTP on iOS or macOS

FTPUpload.swift

import Foundation
import CFNetwork

public class FTPUpload {
    fileprivate let ftpBaseUrl: String
    fileprivate let directoryPath: String
    fileprivate let username: String
    fileprivate let password: String

    public init(baseUrl: String, userName: String, password: String, directoryPath: String) {
        self.ftpBaseUrl = baseUrl
        self.username = userName
        self.password = password
        self.directoryPath = directoryPath
    }
}


// MARK: - Steam Setup
extension FTPUpload {
    private func setFtpUserName(for ftpWriteStream: CFWriteStream, userName: CFString) {
        let propertyKey = CFStreamPropertyKey(rawValue: kCFStreamPropertyFTPUserName)
        CFWriteStreamSetProperty(ftpWriteStream, propertyKey, userName)
    }

    private func setFtpPassword(for ftpWriteStream: CFWriteStream, password: CFString) {
        let propertyKey = CFStreamPropertyKey(rawValue: kCFStreamPropertyFTPPassword)
        CFWriteStreamSetProperty(ftpWriteStream, propertyKey, password)
    }

    fileprivate func ftpWriteStream(forFileName fileName: String) -> CFWriteStream? {
        let fullyQualifiedPath = "ftp://\(ftpBaseUrl)/\(directoryPath)/\(fileName)"

        guard let ftpUrl = CFURLCreateWithString(kCFAllocatorDefault, fullyQualifiedPath as CFString, nil) else { return nil }
        let ftpStream = CFWriteStreamCreateWithFTPURL(kCFAllocatorDefault, ftpUrl)
        let ftpWriteStream = ftpStream.takeRetainedValue()
        setFtpUserName(for: ftpWriteStream, userName: username as CFString)
        setFtpPassword(for: ftpWriteStream, password: password as CFString)
        return ftpWriteStream
    }
}


// MARK: - FTP Write
extension FTPUpload {
    public func send(data: Data, with fileName: String, success: @escaping ((Bool)->Void)) {

        guard let ftpWriteStream = ftpWriteStream(forFileName: fileName) else {
            success(false)
            return
        }

        if CFWriteStreamOpen(ftpWriteStream) == false {
            print("Could not open stream")
            success(false)
            return
        }

        let fileSize = data.count
        let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: fileSize)
        data.copyBytes(to: buffer, count: fileSize)

        defer {
            CFWriteStreamClose(ftpWriteStream)
            buffer.deallocate(capacity: fileSize)
        }

        var offset: Int = 0
        var dataToSendSize: Int = fileSize

        repeat {
            let bytesWritten = CFWriteStreamWrite(ftpWriteStream, &buffer[offset], dataToSendSize)
            if bytesWritten > 0 {
                offset += bytesWritten.littleEndian
                dataToSendSize -= bytesWritten
                continue
            } else if bytesWritten < 0 {
                // ERROR
                print("FTPUpload - ERROR")
                break
            } else if bytesWritten == 0 {
                // SUCCESS
                print("FTPUpload - Completed!!")
                break
            }
        } while CFWriteStreamCanAcceptBytes(ftpWriteStream)
        
        success(true)
    }
}

Works perfectly thank you sir.

not working for me bytesWritten return -1 at first time

I got it. I have looked through the meaning of bytesWritten equals to -1 and it turns out there is error by connection.
By my side it is maybe because of too many connections already existed so I restart my device and it worked then.

anyway, the bytesWritten equals to -1 doesn't mean you have a problem with the file, but it is mostly because of the connection.

Works perfectly thank you sir.

not working for me bytesWritten return -1 at first time

I got it. I have looked through the meaning of bytesWritten equals to -1 and it turns out there is error by connection.
By my side it is maybe because of too many connections already existed so I restart my device and it worked then.

anyway, the bytesWritten equals to -1 doesn't mean you have a problem with the file, but it is mostly because of the connection.

It can be because of problem in credentials.

Is there any Lib or same as above class that we can get file URL so that we can load the url or download that attachment?