Is it possible to download a file from one server (sftp) and upload it to my server using php?

I have been told this cannot be done but I want to get some other opinions here. I am a bit of a newbie when it comes to things like this.

My Site: ExampleSiteA.com

File to download: ExampleSiteB.com

Basically, I am downloading a csv file from ExampleSiteB.com to make updates to my site, ExampleSiteA.com. To do this, I am downloading the csv file manually through CoreFTP and then uploading it manually to ExampleSiteA.com. The file changes daily and I would like to skip this step so I can automate the process.

Keep in mind that I need to download the csv file from ExampleSiteB.com through SFTP...

I am not sure if it is possible to directly download/upload a file from one server to another if one is SFTP. The file size is also quite large, it averages about 25,000 KB / 25 MB.

Another option that I haven't explored yet is requiring or including a file from another server... is that an option or a possibility? The file is located in a folder exclusively for my site and a login is required for SFTP download.

Any insight will be appreciated. Thanks in advance!

Answers


Go here and download what you need: http://phpseclib.sourceforge.net/

UPDATE

  • FOR SFTP

Then in your script:

<?php
include('Net/SFTP.php');

$url = 'http://www.downloadsite.com';
$fileToDownload = "yourCSV.csv";
$cmd = "wget -q \"$url\" -O $fileToDownload";
exec($cmd);

$sftp = new Net_SFTP('www.uploadsite.com');
if (!$sftp->login('username', 'password')) {
    exit('Login Failed');
}

echo $sftp->pwd() . "\r\n";
$sftp->put('remote.file.csv', 'yourCSV.csv', NET_SFTP_LOCAL_FILE);
print_r($sftp->nlist());
?>

If you need to connect to a second server for download:

$sftp2 = new Net_SFTP('www.serverFromWhichToDownload.com');
if (!$sftp2->login('username', 'password')) {
    exit('Login Failed');
}

echo $sftp2->pwd() . "\r\n";
$sftp2->get('localFileName.csv', 'remoteFileName.csv');
print_r($sftp2->nlist());

Read the docs for further help and examples: http://phpseclib.sourceforge.net/documentation/net.html#net_sftp_get

To Log what your connection is doing if it fails, etc. use this:

include('Net/SSH2.php');
define('NET_SSH2_LOGGING', true);
$ssh = new Net_SSH2('www.domain.tld');
$ssh->login('username','password');
echo $ssh->getLog();
  • FOR FTP upload - SO has gone crazy, does not want to format my code, but here it is anyway:
$file = 'somefile.txt';
$remote_file = 'readme.txt';
$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
if (ftp_put($conn_id, $remote_file, $file, FTP_ASCII)) {
    echo "successfully uploaded $file\n";
} else {
    echo "There was a problem while uploading $file\n";
}
ftp_close($conn_id);

Yes, that's possible using ssh2_sftp.

http://php.net/manual/en/function.ssh2-sftp.php


I have had good luck with cURL in the past. If you are on a Linux box, it would be trivial to set up a CRON job to do this update process for you. A good reference for CLI HTTP scripting in cURL can be found here, however you may need the -T flag (for file transport) to accomplish the upload portion. Speaking of uploading, if you can run the script/process/crontab from the server you would like to update, I would recommend downloading from the web server to obviate one trip and a third party. Or, if you need to update on demand, you could write a PHP script that uses the built in PHP cURL functions. If you take the Linux+CLI route, you could also use sftp.

Update: In testing curl with sftp (curl -u uname:pword sftp://domain.tld) I get the following error: curl: (1) Protocol sftp not supported or disabled in libcurl on Kubuntu 12.04. So cURL may not be a good idea. I also tested CLI sftp (sftp uname@domain.tld:/dir/file.ext) but could not find a way (short of using ssh keys) to send authentication. Thus, this would necessarily be a manual process unless you did set up ssh keys between the servers. As it does not sound like you have that kind of access to ExampleSiteB.com, this probably isn't acceptable.

Update 2: Since my initial answer turned out to be of little use, I figured I would expand upon one of the above answers. I was trying to find a solution that did not involve a PECL extension, but I did not have much luck with ftp_ssh_connect(). I recommend trying it, you may have better luck and could forgo the PECL extension route.

Sigh, on further reading, it appears ftp_ssh_connect is, understandably, incompatible with the sftp protocol. However, I found a nice blog post about utilizing ssh2_connect() and ssh2_sftp() (as mentioned in a previous answer) and figured I would post that to give you some additional assistance. It is not as simple as calling the functions for most PHP distributions. Here is the blog post. Some of those steps may not be necessary or you may need to do some additional things listed in another blog post I ran across, here.

On my system, all I had to do was run apt-get install libssh2-1-dev libssh2-php and I was able to find ssh2 in my php -m output.


Having an include, as long as you have read/write permissions on the website you're getting the file from should work, however this is just guess work atm as i don't have any means of checking it. Good luck though!


Yes, you should be able to do this.

Whoever told you that you can't do this might be getting confused with JavaScript and cross-site scripting browser restrictions which prevent JavaScript downloaded from one domain to access content in a different domain.

That being said, if you are using PHP which to me implies that you are talking about PHP running on a web sever, you should be able to use PHP or any other scripting or programming language to download the file from SiteB.com, then update the file, and then finally FTP the file to a different web server (SiteA.com).


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