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  <header>
    <copyright>
      <year>2012</year><year>2016</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
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          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
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    </legalnotice>

    <title>http_uri</title>
    <prepared></prepared>
    <responsible></responsible>
    <docno></docno>
    <date></date>
    <rev></rev>
  </header>

  <module>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()</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()</c></tag>
       <item><p></p></item>
       <tag><c>scheme() = atom()</c></tag>
       <item><p>Example: http, https</p></item>
       <tag><c>host() = string()</c></tag>
       <item><p></p></item>
       <tag><c>port() = pos_integer()</c></tag>
       <item><p></p></item>
       <tag><c>path() = string()</c></tag>
       <item><p>Represents a file path or directory path</p></item>
       <tag><c>query() = string()</c></tag>
       <item><p></p></item>
       <tag><c>fragment() = string()</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>decode(HexEncodedURI) -> URI</name>
      
      <fsummary>Decodes a hexadecimal encoded URI.</fsummary>
      <type>
        <v>HexEncodedURI = string() - A possibly hexadecimal encoded URI</v>
        <v>URI = uri()</v>
      </type>

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

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

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

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

    <func>
      <name>parse(URI) -> {ok, Result} | {error, Reason}</name>
      <name>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>UserInfo = user_info()</v>
	<v>Host = host()</v>
	<v>Port = pos_integer()</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()) ->
	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>

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

    <func>
      <name>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() = pos_integer()</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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