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Uploading files to an FTP server is only possible if you have write permissions on the server in the directory to which you want to upload. Therefore, none of the examples in this section will work unedited, as you can t provide an FTP server with write access (for obvious reasons!). Uploading is the exact opposite of downloading, and net/ftp provides putbinaryfile and puttextfile methods that accept the same parameters as getbinaryfile and gettextfile. The first parameter is the name of the local file you want to upload, the optional second parameter is the name to give the file on the remote server (defaults to the same as the uploaded file s name if omitted), and the optional third parameter for putbinaryfile is the block size to use for the upload. Here s an upload example: require 'net/ftp' ftp = Net::FTP.new('ftp.domain.com') ftp.passive = true
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ftp.login ftp.chdir('/your/folder/name/here') ftp.putbinaryfile('local_file') ftp.close As with getbinaryfile and gettextfile, if you supply a code block, the uploaded chunks of the file are passed into it, allowing you to keep the user informed of the progress of the upload. require 'net/ftp' ftp = Net::FTP.new('ftp.domain.com') ftp.passive = true ftp.login ftp.chdir('/your/folder/name/here') count = 0 ftp.putbinaryfile('local_file', 'local_file', 100000) do |block| count += 100000 puts "#{count} bytes uploaded" end ftp.close If you need to upload data that s just been generated by your Ruby script and isn t within a file, you need to create a temporary file with tempfile and upload from that. For example: require 'net/ftp' require 'tempfile' tempfile = Tempfile.new('test') my_data = "This is some text data I want to upload via FTP." tempfile.puts my_data ftp = Net::FTP.new('ftp.domain.com') ftp.passive = true ftp.login ftp.chdir('/your/folder/name/here') ftp.puttextfile(tempfile.path, 'my_data') ftp.close tempfile.close
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In this chapter, we ve looked at Ruby s support for using various Internet systems and protocols, how Ruby can work with the Web, and how to process and manipulate data retrieved from the Internet. Let s reflect on the main concepts covered in this chapter: HTTP (HyperText Transfer Protocol): A protocol that defines the way web browsers (clients) and web servers talk to each other across a network such as the Internet. HTTPS: A secure version of HTTP that ensures data being transferred in either direction is only readable at each end. Anyone intercepting an HTTPS stream cannot decipher it. It s commonly used for e-commerce and for transmitting financial data on the Web. HTML (HyperText Markup Language): A text formatting and layout language used to represent web pages. Markaby: A Ruby library that makes it possible to produce HTML directly from Ruby methods and logic. RedCloth: A Ruby implementation of the Textile markup language that makes it easy to produce HTML documents from specially formatted plain text. Hpricot: A self-proclaimed fast and delightful HTML parser developed to make it easy to process and parse HTML with Ruby. It is noted for its speed, with portions that demand extra performance written in C. POP3 (Post Office Protocol 3): A mail server protocol commonly used when retrieving e-mail. You can learn more about the protocol specifically at http://www.ietf.org/ rfc/rfc1939.txt. SMTP (Simple Mail Transfer Protocol): A mail server protocol commonly used to transfer mail to a mail server or between mail servers. From a typical user s perspective, SMTP is used for sending mail, rather than receiving it. You can learn more about the protocol specifically at http://www.faqs.org/rfcs/rfc821.html. FTP (File Transfer Protocol): An Internet protocol for providing access to files located on a server and allowing users to download from it and upload to it.
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In this chapter, we ve covered a variety of Internet-related functions, but in 15 we re going to look more deeply at networking, servers, and network services. Most of what is covered in 15 is also applicable to the Internet, but is at a much lower level than FTP or using the Web.
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