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  <header>
    <copyright>
      <year>2012</year><year>2018</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
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      Licensed under the Apache License, Version 2.0 (the "License");
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    <title>http_uri</title>
    <prepared></prepared>
    <responsible></responsible>
    <docno></docno>
    <date></date>
    <rev></rev>
  </header>

  <module since="OTP R15B01">http_uri</module>
  <modulesummary>URI utility module</modulesummary>

  <description>
    <p>This module provides utility functions for working with URIs, 
    according to 
    <url href="http://www.ietf.org/rfc/rfc3986.txt">RFC 3986</url>.</p>
  </description>
  
  <section>
    <title>DATA TYPES</title>
    <p>Type definitions that are used more than once in
      this module:</p>
    <p><c>boolean() = true | false</c></p>
    <p><c>string()</c> = list of ASCII characters</p>

  </section>
  
  <section>
    <title>URI DATA TYPES</title>
    <p>Type definitions that are related to URI:</p>
    
<taglist>
       <tag><c>uri() = string() | binary()</c></tag>
       <item><p>Syntax according to the URI definition in RFC 3986,
       for example, "http://www.erlang.org/"</p></item>
       <tag><c>user_info() = string() | binary()</c></tag>
       <item><p></p></item>
       <tag><c>scheme() = atom()</c></tag>
       <item><p>Example: http, https</p></item>
       <tag><c>host() = string() | binary()</c></tag>
       <item><p></p></item>
       <tag><c>port() = inet:port_number()</c></tag>
       <item><p></p></item>
       <tag><c>path() = string() | binary()</c></tag>
       <item><p>Represents a file path or directory path</p></item>
       <tag><c>query() = string() | binary()</c></tag>
       <item><p></p></item>
       <tag><c>fragment() = string() | binary()</c></tag>
       <item><p></p></item>
     </taglist>
   
     <p>For more information about URI, see
     <url href="http://www.ietf.org/rfc/rfc3986.txt">RFC 3986</url>.</p>
    <marker id="scheme_defaults"></marker>
  </section>
  
  <funcs>
    <func>
      <name since="OTP R15B01">decode(HexEncodedURI) -> URI</name>
      
      <fsummary>Decodes a hexadecimal encoded URI.</fsummary>
      <type>
        <v>HexEncodedURI = string() | binary() - A possibly hexadecimal encoded URI</v>
        <v>URI = uri()</v>
      </type>

      <desc>
        <p>Decodes a possibly hexadecimal encoded URI.</p>

      </desc>
    </func>
    <func>
      <name since="OTP R15B01">encode(URI) -> HexEncodedURI</name>
      
      <fsummary>Encodes a hexadecimal encoded URI.</fsummary>
      <type>
        <v>URI = uri()</v>
        <v>HexEncodedURI = string() | binary() - Hexadecimal encoded URI</v>
      </type>

      <desc>
        <p>Encodes a hexadecimal encoded URI.</p>

        <marker id="decode"></marker>
      </desc>
    </func>

    <func>
      <name since="OTP R15B01">parse(URI) -> {ok, Result} | {error, Reason}</name>
      <name since="OTP R15B01">parse(URI, Options) -> {ok, Result} | {error, Reason}</name>
      <fsummary>Parses a URI.</fsummary>
      <type>
        <v>URI = uri()</v> 
        <v>Options = [Option]</v> 
        <v>Option = {ipv6_host_with_brackets, boolean()} | 
                    {scheme_defaults, scheme_defaults()} |
                    {fragment, boolean()} |
                    {scheme_validation_fun, fun()}</v>
        <v>Result = {Scheme, UserInfo, Host, Port, Path, Query} |
                    {Scheme, UserInfo, Host, Port, Path, Query, Fragment}</v>
	<v>Scheme = scheme()</v>
	<v>UserInfo = user_info()</v>
	<v>Host = host()</v>
	<v>Port = inet:port_number()</v>
	<v>Path = path()</v>
	<v>Query = query()</v>
        <v>Fragment = fragment()</v>
	<v>Reason = term()</v>
      </type>
      <desc>
        <p>Parses a URI. If no scheme defaults 
	are provided, the value of the
	<seealso marker="#scheme_defaults">scheme_defaults</seealso>
	function is used.</p>

        <p>When parsing a URI with an unknown scheme (that is, 
	a scheme not found in the scheme defaults), a port number must be 
	provided, otherwise the parsing fails.</p>

        <p>If the fragment option is <c>true</c>, the URI fragment is returned as
          part of the parsing result, otherwise it is ignored.</p>

        <p>Scheme validation fun is to be defined as follows:</p>

	<code>
fun(SchemeStr :: string() | binary()) ->
	valid |	{error, Reason :: term()}.
	</code>

        <p>It is called before scheme string gets converted into scheme atom and
        thus possible atom leak could be prevented</p>

        <warning>
          <p>The scheme portion of the URI gets converted into atom,
          meaning that atom leak may occur. Specifying a scheme
          validation fun is recommended unless the URI is already
          sanitized.</p>
        </warning>

        <marker id="encode"></marker>
      </desc>
    </func>

    <func>
      <name since="OTP R15B01">scheme_defaults() -> SchemeDefaults</name>
      <fsummary>A list of the scheme and their default ports.</fsummary>
      <type>
        <v>SchemeDefaults = [{scheme(), default_scheme_port_number()}] </v> 
	<v>default_scheme_port_number() = inet:port_number()</v>
      </type>
      <desc>
        <p>Provides a list of the scheme and their default 
	port numbers supported (by default) by this utility.</p>

        <marker id="parse"></marker>
      </desc>
    </func>

   

  </funcs>

<!--
  <section>
    <title>SEE ALSO</title>
    <p><url href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</url>, 
    <seealso marker="inets">inets(3)</seealso>,
      <seealso marker="kernel:gen_tcp">gen_tcp(3)</seealso>, 
      <seealso marker="ssl:ssl">ssl(3)</seealso>
    </p>
  </section>
-->

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