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Diego Martínez
289
doc/luasocket/ftp.html
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doc/luasocket/ftp.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta name="description" content="LuaSocket: FTP support">
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<meta name="keywords" content="Lua, LuaSocket, FTP, Network, Library, Support">
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<title>LuaSocket: FTP support</title>
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<link rel="stylesheet" href="reference.css" type="text/css">
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</head>
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<body>
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<!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=header>
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<hr>
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<center>
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<table summary="LuaSocket logo">
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<tr><td align=center><a href="http://www.lua.org">
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<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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</a></td></tr>
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<tr><td align=center valign=top>Network support for the Lua language
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</td></tr>
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</table>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#download">download</a> ·
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<a href="installation.html">installation</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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</center>
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<hr>
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</div>
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<!-- ftp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=ftp>FTP</h2>
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<p>
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FTP (File Transfer Protocol) is a protocol used to transfer files
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between hosts. The <tt>ftp</tt> namespace offers thorough support
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to FTP, under a simple interface. The implementation conforms to
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc0959.txt">RFC 959</a>.
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</p>
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<p>
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High level functions are provided supporting the most common operations.
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These high level functions are implemented on top of a lower level
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interface. Using the low-level interface, users can easily create their
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own functions to access <em>any</em> operation supported by the FTP
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protocol. For that, check the implementation.
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</p>
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<p>
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To really benefit from this module, a good understanding of
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
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LTN012, Filters sources and sinks</a> is necessary.
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</p>
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<p>
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To obtain the <tt>ftp</tt> namespace, run:
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</p>
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<pre class=example>
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-- loads the FTP module and any libraries it requires
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local ftp = require("socket.ftp")
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</pre>
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<p>
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URLs MUST conform to
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc1738.txt">RFC
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1738</a>, that is, an URL is a string in the form:
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</p>
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<blockquote>
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<tt>
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[ftp://][<user>[:<password>]@]<host>[:<port>][/<path>][<i>type</i>=a|i]</tt>
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</blockquote>
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<p>
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The following constants in the namespace can be set to control the default behavior of
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the FTP module:
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</p>
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<ul>
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<li> <tt>PASSWORD</tt>: default anonymous password.
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<li> <tt>PORT</tt>: default port used for the control connection;
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<li> <tt>TIMEOUT</tt>: sets the timeout for all I/O operations;
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<li> <tt>USER</tt>: default anonymous user;
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</ul>
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<!-- ftp.get ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id=get>
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ftp.<b>get(</b>url<b>)</b><br>
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ftp.<b>get{</b><br>
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host = <i>string</i>,<br>
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sink = <i>LTN12 sink</i>,<br>
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argument <i>or</i> path = <i>string</i>,<br>
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[user = <i>string</i>,]<br>
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[password = <i>string</i>]<br>
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[command = <i>string</i>,]<br>
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[port = <i>number</i>,]<br>
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[type = <i>string</i>,]<br>
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[step = <i>LTN12 pump step</i>,]<br>
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[create = <i>function</i>]<br>
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<b>}</b>
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</p>
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<p class=description>
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The <tt>get</tt> function has two forms. The simple form has fixed
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functionality: it downloads the contents of a URL and returns it as a
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string. The generic form allows a <em>lot</em> more control, as explained
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below.
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</p>
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<p class=parameters>
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If the argument of the <tt>get</tt> function is a table, the function
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expects at least the fields <tt>host</tt>, <tt>sink</tt>, and one of
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<tt>argument</tt> or <tt>path</tt> (<tt>argument</tt> takes
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precedence). <tt>Host</tt> is the server to connect to. <tt>Sink</tt> is
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the <em>simple</em>
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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sink that will receive the downloaded data. <tt>Argument</tt> or
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<tt>path</tt> give the target path to the resource in the server. The
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optional arguments are the following:
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</p>
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<ul>
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<li><tt>user</tt>, <tt>password</tt>: User name and password used for
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authentication. Defaults to "<tt>ftp:anonymous@anonymous.org</tt>";
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<li><tt>command</tt>: The FTP command used to obtain data. Defaults to
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"<tt>retr</tt>", but see example below;
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<li><tt>port</tt>: The port to used for the control connection. Defaults to 21;
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<li><tt>type</tt>: The transfer mode. Can take values "<tt>i</tt>" or
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"<tt>a</tt>". Defaults to whatever is the server default;
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<li><tt>step</tt>:
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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pump step function used to pass data from the
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server to the sink. Defaults to the LTN12 <tt>pump.step</tt> function;
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<li><tt>create</tt>: An optional function to be used instead of
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<a href=tcp.html#socket.tcp><tt>socket.tcp</tt></a> when the communications socket is created.
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</ul>
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<p class=return>
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If successful, the simple version returns the URL contents as a
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string, and the generic function returns 1. In case of error, both
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functions return <b><tt>nil</tt></b> and an error message describing the
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error.
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</p>
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<pre class=example>
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-- load the ftp support
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local ftp = require("socket.ftp")
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-- Log as user "anonymous" on server "ftp.tecgraf.puc-rio.br",
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-- and get file "lua.tar.gz" from directory "pub/lua" as binary.
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f, e = ftp.get("ftp://ftp.tecgraf.puc-rio.br/pub/lua/lua.tar.gz;type=i")
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</pre>
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<pre class=example>
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-- load needed modules
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local ftp = require("socket.ftp")
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local ltn12 = require("ltn12")
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local url = require("socket.url")
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-- a function that returns a directory listing
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function nlst(u)
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local t = {}
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local p = url.parse(u)
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p.command = "nlst"
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p.sink = ltn12.sink.table(t)
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local r, e = ftp.get(p)
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return r and table.concat(t), e
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end
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</pre>
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<!-- put ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id=put>
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ftp.<b>put(</b>url, content<b>)</b><br>
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ftp.<b>put{</b><br>
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host = <i>string</i>,<br>
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source = <i>LTN12 sink</i>,<br>
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argument <i>or</i> path = <i>string</i>,<br>
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[user = <i>string</i>,]<br>
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[password = <i>string</i>]<br>
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[command = <i>string</i>,]<br>
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[port = <i>number</i>,]<br>
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[type = <i>string</i>,]<br>
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[step = <i>LTN12 pump step</i>,]<br>
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[create = <i>function</i>]<br>
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<b>}</b>
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</p>
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<p class=description>
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The <tt>put</tt> function has two forms. The simple form has fixed
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functionality: it uploads a string of content into a URL. The generic form
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allows a <em>lot</em> more control, as explained below.
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</p>
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<p class=parameters>
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If the argument of the <tt>put</tt> function is a table, the function
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expects at least the fields <tt>host</tt>, <tt>source</tt>, and one of
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<tt>argument</tt> or <tt>path</tt> (<tt>argument</tt> takes
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precedence). <tt>Host</tt> is the server to connect to. <tt>Source</tt> is
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the <em>simple</em>
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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source that will provide the contents to be uploaded.
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<tt>Argument</tt> or
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<tt>path</tt> give the target path to the resource in the server. The
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optional arguments are the following:
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</p>
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<ul>
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<li><tt>user</tt>, <tt>password</tt>: User name and password used for
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authentication. Defaults to "<tt>ftp:anonymous@anonymous.org</tt>";
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<li><tt>command</tt>: The FTP command used to send data. Defaults to
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"<tt>stor</tt>", but see example below;
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<li><tt>port</tt>: The port to used for the control connection. Defaults to 21;
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<li><tt>type</tt>: The transfer mode. Can take values "<tt>i</tt>" or
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"<tt>a</tt>". Defaults to whatever is the server default;
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<li><tt>step</tt>:
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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pump step function used to pass data from the
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server to the sink. Defaults to the LTN12 <tt>pump.step</tt> function;
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<li><tt>create</tt>: An optional function to be used instead of
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<a href=tcp.html#socket.tcp><tt>socket.tcp</tt></a> when the communications socket is created.
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</ul>
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<p class=return>
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Both functions return 1 if successful, or <b><tt>nil</tt></b> and an error
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message describing the reason for failure.
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</p>
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<pre class=example>
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-- load the ftp support
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local ftp = require("socket.ftp")
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-- Log as user "fulano" on server "ftp.example.com",
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-- using password "silva", and store a file "README" with contents
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-- "wrong password, of course"
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f, e = ftp.put("ftp://fulano:silva@ftp.example.com/README",
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"wrong password, of course")
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</pre>
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<pre class=example>
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-- load the ftp support
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local ftp = require("socket.ftp")
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local ltn12 = require("ltn12")
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-- Log as user "fulano" on server "ftp.example.com",
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-- using password "silva", and append to the remote file "LOG", sending the
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-- contents of the local file "LOCAL-LOG"
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f, e = ftp.put{
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host = "ftp.example.com",
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user = "fulano",
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password = "silva",
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command = "appe",
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argument = "LOG",
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source = ltn12.source.file(io.open("LOCAL-LOG", "r"))
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}
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</pre>
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<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=footer>
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<hr>
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<center>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#download">download</a> ·
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<a href="installation.html">installation</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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<p>
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<small>
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Last modified by Diego Nehab on <br>
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Mon Nov 21 01:56:32 EST 2005
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</small>
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</p>
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</center>
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</div>
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</body>
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</html>
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