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)
    }
}

Can anyone assist with using this to upload a local video file on the device to FTP?
I've got it working with an image, just curious how I can arrange it to upload a .mp4/.mov file.

Can you tell me how it works with image or txt file?
I cannot find the right data type for the send function.
Thanks!!

Sure, for a .txt file, make sure the file is added to your project. To upload the file you would use:

let ftp = FTPUpload(baseUrl: String, userName: String, password: String, directoryPath: String)

do { 
let data = try Data(contentsOf: url (this is your .txt file location as a URL) as URL, options: [ .alwaysMapped, .uncached])

ftp.send(data: data , with: "name.txt") { (success) in 

        print("success") 
        }
        print(data)
        }
        catch {
        print(error)
    }
}

Hope this helps!

I think I got it. But I have a problem with file access.
I got error message, although, I have switched off the AppSandbox already.

Error Domain=NSCocoaErrorDomain Code=257 "The file “XXX” couldn’t be opened because you don’t have permission to view it." UserInfo={NSFilePath=/Users/XXX, NSUnderlyingError=0x600000c8d4d0 {Error Domain=NSPOSIXErrorDomain Code=13 "Permission denied"}}
It seems I don't have access to that file?

Are you trying to access the file on your development machine? Make sure you've added the file you are trying to access to your xcode project file. That might be the cause.

Can anyone assist with using this to upload a local video file on the device to FTP?
I've got it working with an image, just curious how I can arrange it to upload a .mp4/.mov file.

Can you tell me how it works with image or txt file?
I cannot find the right data type for the send function.
Thanks!!

Sure, for a .txt file, make sure the file is added to your project. To upload the file you would use:

let ftp = FTPUpload(baseUrl: String, userName: String, password: String, directoryPath: String)

do { 
let data = try Data(contentsOf: url (this is your .txt file location as a URL) as URL, options: [ .alwaysMapped, .uncached])

ftp.send(data: data , with: "name.txt") { (success) in 

        print("success") 
        }
        print(data)
        }
        catch {
        print(error)
    }
}

Hope this helps!

I think I got it. But I have a problem with file access.
I got error message, although, I have switched off the AppSandbox already.
Error Domain=NSCocoaErrorDomain Code=257 "The file “XXX” couldn’t be opened because you don’t have permission to view it." UserInfo={NSFilePath=/Users/XXX, NSUnderlyingError=0x600000c8d4d0 {Error Domain=NSPOSIXErrorDomain Code=13 "Permission denied"}}
It seems I don't have access to that file?

Are you trying to access the file on your development machine? Make sure you've added the file you are trying to access to your xcode project file. That might be the cause.

But I would like to upload a file each time when I create by my app. So it is no possible for me to add those files into the project file, right? Is there another way? Is there another method to access files?

### Now working for me.

How create folder in server?

How to download/view file from FTP Server.

How create folder in server?

Manually

Now working for me.

I have solved my problem but facing the same problem as you.
The bytesWritten equals to -1 and it is not going to upload anything...
Did you solve your problem?

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?