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<a name="libepc-1.0-auth-context"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libepc-1.0-auth-context.top_of_page"></a>EpcAuthContext</span></h2>
<p>EpcAuthContext — manage authentication</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libepc-1.0-auth-context.stability-level"></a><h2>Stability Level</h2>
Unstable, unless otherwise indicated
</div>
<div class="refsynopsisdiv">
<a name="libepc-1.0-auth-context.synopsis"></a><h2>Synopsis</h2>
<a name="EpcAuthFlags"></a><pre class="synopsis">
#include <libepc/publish.h>
enum <a class="link" href="libepc-1.0-auth-context.html#EpcAuthFlags-enum" title="enum EpcAuthFlags">EpcAuthFlags</a>;
<span class="returnvalue">gboolean</span> (<a class="link" href="libepc-1.0-auth-context.html#EpcAuthHandler" title="EpcAuthHandler ()">*EpcAuthHandler</a>) (<em class="parameter"><code><a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *username</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);
<a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext">EpcAuthContext</a>;
<span class="returnvalue">gboolean</span> <a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-check-password" title="epc_auth_context_check_password ()">epc_auth_context_check_password</a> (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *password</code></em>);
const <span class="returnvalue">gchar</span> * <a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-get-key" title="epc_auth_context_get_key ()">epc_auth_context_get_key</a> (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>);
const <span class="returnvalue">gchar</span> * <a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-get-password" title="epc_auth_context_get_password ()">epc_auth_context_get_password</a> (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>);
<a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="returnvalue">EpcPublisher</span></a> * <a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-get-publisher" title="epc_auth_context_get_publisher ()">epc_auth_context_get_publisher</a> (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>);
<span class="returnvalue">GFlagsClass</span> * <a class="link" href="libepc-1.0-auth-context.html#epc-auth-flags-get-class" title="epc_auth_flags_get_class ()">epc_auth_flags_get_class</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
const <span class="returnvalue">gchar</span> * <a class="link" href="libepc-1.0-auth-context.html#epc-auth-flags-to-string" title="epc_auth_flags_to_string ()">epc_auth_flags_to_string</a> (<em class="parameter"><code><a class="link" href="libepc-1.0-auth-context.html#EpcAuthFlags"><span class="type">EpcAuthFlags</span></a> value</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libepc-1.0-auth-context.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GFlags
+----EpcAuthFlags
</pre>
</div>
<div class="refsect1">
<a name="libepc-1.0-auth-context.description"></a><h2>Description</h2>
<p>
With each request the <a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="type">EpcPublisher</span></a> verifies access authorization by calling
the <a class="link" href="libepc-1.0-auth-context.html#EpcAuthHandler" title="EpcAuthHandler ()"><span class="type">EpcAuthHandler</span></a> registered for the key in question, if any. Information about
that process is stored in the <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> structure.
</p>
<p>
To register an authentication handler call <a class="link" href="libepc-1.0-publisher.html#epc-publisher-set-auth-handler" title="epc_publisher_set_auth_handler ()"><code class="function">epc_publisher_set_auth_handler()</code></a>:
</p>
<p>
</p>
<div class="example">
<a name="register-auth-handler"></a><p class="title"><b>Example 3. Register an authentication handler</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="libepc-1.0-publisher.html#epc-publisher-set-auth-handler">epc_publisher_set_auth_handler</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">publisher</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"sensitive-key"</span><span class="symbol">,</span>
<span class="normal"> my_auth_handler</span><span class="symbol">,</span><span class="normal"> my_object</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<p>
To verify that the user password provided password matches
the expected one use <a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-check-password" title="epc_auth_context_check_password ()"><code class="function">epc_auth_context_check_password()</code></a>:
</p>
<p>
</p>
<div class="example">
<a name="check-password"></a><p class="title"><b>Example 4. Verify a password</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> gboolean</span>
<span class="function">my_auth_handler</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">EpcAuthContext</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">context</span><span class="symbol">,</span>
<span class="normal"> </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">username</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> user_data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">MyObject</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">self </span><span class="symbol">=</span><span class="normal"> user_data</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">expected_password</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">requested_key</span><span class="symbol">;</span>
<span class="normal"> requested_key </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="libepc-1.0-auth-context.html#epc-auth-context-get-key">epc_auth_context_get_key</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">);</span>
<span class="normal"> expected_password </span><span class="symbol">=</span><span class="normal"> </span><span class="function">lookup_password</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">self</span><span class="symbol">,</span><span class="normal"> requested_key</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> </span><span class="function"><a href="libepc-1.0-auth-context.html#epc-auth-context-check-password">epc_auth_context_check_password</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">context</span><span class="symbol">,</span><span class="normal"> expected_password</span><span class="symbol">);</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
</div>
<div class="refsect1">
<a name="libepc-1.0-auth-context.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="EpcAuthFlags-enum"></a><h3>enum EpcAuthFlags</h3>
<pre class="programlisting">typedef enum {
EPC_AUTH_DEFAULT = 0,
EPC_AUTH_PASSWORD_TEXT_NEEDED = (1 << 0)
} EpcAuthFlags;
</pre>
<p>
These flags specify the authentication behaviour of an <a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="type">EpcPublisher</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="EPC-AUTH-DEFAULT:CAPS"></a><span class="term"><code class="literal">EPC_AUTH_DEFAULT</code></span></p></td>
<td>The default authentication settings.
</td>
</tr>
<tr>
<td><p><a name="EPC-AUTH-PASSWORD-TEXT-NEEDED:CAPS"></a><span class="term"><code class="literal">EPC_AUTH_PASSWORD_TEXT_NEEDED</code></span></p></td>
<td>Set this flag when your <a class="link" href="libepc-1.0-auth-context.html#EpcAuthFlags"><span class="type">EpcAuthFlags</span></a>
needs the supplied password in plain text - for instance to pass it to a
database server used by your application. This flag replaces the secure Digest
authentication scheme with the insecure Basic authentication scheme.
Therefore this setting is valid only when the publisher's transport
protocol is <a class="link" href="EpcProtocol.html#EPC-PROTOCOL-HTTPS:CAPS"><span class="type">EPC_PROTOCOL_HTTPS</span></a> (secure http).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="EpcAuthHandler"></a><h3>EpcAuthHandler ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> (*EpcAuthHandler) (<em class="parameter"><code><a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *username</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);</pre>
<p>
Functions implementing this callback shall return <code class="literal">TRUE</code> when the
credentials provided by the authentication request grant access
to the resource described by <em class="parameter"><code>context</code></em>.
</p>
<p>
The <em class="parameter"><code>username</code></em> is <a href="/opt/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> when no creditials were passed, and anonymous access
is tried.
</p>
<p>
See also <a class="link" href="libepc-1.0-publisher.html#epc-publisher-set-auth-flags" title="epc_publisher_set_auth_flags ()"><span class="type">epc_publisher_set_auth_flags</span></a>. When EPC_AUTH_DEFAULT is used,
you should call <a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-check-password" title="epc_auth_context_check_password ()"><span class="type">epc_auth_context_check_password</span></a>
to verify that the password passed in the request matches the known password
for that user. In this case there is no way to retrieve the password from
the <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> because the network protocol transfers just a hash code,
not the actual password.
</p>
<p>
However, when EPC_AUTH_PASSWORD_TEXT_NEEDED is used, you should call
<a class="link" href="libepc-1.0-auth-context.html#epc-auth-context-get-password" title="epc_auth_context_get_password ()"><code class="function">epc_auth_context_get_password()</code></a> and then do your own authentication check.
For instance, you might need to delegate the authentication to some other
code or server, such as a database server.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>the <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>username</code></em> :</span></p></td>
<td>the username provided for authentication, or <a href="/opt/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was installed</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> when access is granted, and <code class="literal">FALSE</code> otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="EpcAuthContext"></a><h3>EpcAuthContext</h3>
<pre class="programlisting">typedef struct _EpcAuthContext EpcAuthContext;</pre>
<p>
This data structure describes a pending authentication request
which shall be verified by an <a class="link" href="libepc-1.0-auth-context.html#EpcAuthHandler" title="EpcAuthHandler ()"><span class="type">EpcAuthHandler</span></a> installed by
<a class="link" href="libepc-1.0-publisher.html#epc-publisher-set-auth-handler" title="epc_publisher_set_auth_handler ()"><code class="function">epc_publisher_set_auth_handler()</code></a>.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
<p>
There is no way to retrieve the password from the <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>, as
the network protocol transfers just a hash code, not the actual password.
</p>
</div>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="epc-auth-context-check-password"></a><h3>epc_auth_context_check_password ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> epc_auth_context_check_password (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *password</code></em>);</pre>
<p>
Verifies that the password supplied with the network request matches
the <em class="parameter"><code>password</code></em> the application expects. There is no way to retrieve the
password from the <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>, as the network protocol transfers
just a hash code, not the actual password.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>password</code></em> :</span></p></td>
<td>the expected password</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> when the sent password matches, or <code class="literal">FALSE</code> otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="epc-auth-context-get-key"></a><h3>epc_auth_context_get_key ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> * epc_auth_context_get_key (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>);</pre>
<p>
Queries the resource key associated with the authentication <em class="parameter"><code>context</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The resource key.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="epc-auth-context-get-password"></a><h3>epc_auth_context_get_password ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> * epc_auth_context_get_password (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>);</pre>
<p>
Queries the password sent for the authentication <em class="parameter"><code>context</code></em> when Basic
authentication was allowed for the <em class="parameter"><code>context</code></em>, and <a href="/opt/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> otherwise.
</p>
<p>
See also: <a class="link" href="libepc-1.0-auth-context.html#EPC-AUTH-PASSWORD-TEXT-NEEDED:CAPS"><span class="type">EPC_AUTH_PASSWORD_TEXT_NEEDED</span></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The password sent, or <a href="/opt/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="epc-auth-context-get-publisher"></a><h3>epc_auth_context_get_publisher ()</h3>
<pre class="programlisting"><a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="returnvalue">EpcPublisher</span></a> * epc_auth_context_get_publisher (<em class="parameter"><code>const <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a> *context</code></em>);</pre>
<p>
Queries the <a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="type">EpcPublisher</span></a> owning the authentication <em class="parameter"><code>context</code></em>.
</p>
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<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a <a class="link" href="libepc-1.0-auth-context.html#EpcAuthContext" title="EpcAuthContext"><span class="type">EpcAuthContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The owning <a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="type">EpcPublisher</span></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="epc-auth-flags-get-class"></a><h3>epc_auth_flags_get_class ()</h3>
<pre class="programlisting"><span class="returnvalue">GFlagsClass</span> * epc_auth_flags_get_class (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Retrieves the GFlagsClass describing the EpcAuthFlags flags.
</p>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The GFlagsClass describing EpcAuthFlags.</td>
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</table></div>
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<div class="refsect2">
<a name="epc-auth-flags-to-string"></a><h3>epc_auth_flags_to_string ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> * epc_auth_flags_to_string (<em class="parameter"><code><a class="link" href="libepc-1.0-auth-context.html#EpcAuthFlags"><span class="type">EpcAuthFlags</span></a> value</code></em>);</pre>
<p>
Retrieves the name of a EpcAuthFlags <em class="parameter"><code>value</code></em>, or <a href="/opt/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a> when <em class="parameter"><code>value</code></em> is invalid.
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<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a EpcAuthFlags value</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The string representation of <em class="parameter"><code>value</code></em>, or <a href="/opt/gnome/share/gtk-doc/html/liboil/liboil-liboiljunk.html#NULL--CAPS"><code class="literal">NULL</code></a>.</td>
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</table></div>
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<div class="refsect1">
<a name="libepc-1.0-auth-context.see-also"></a><h2>See Also</h2>
<a class="link" href="libepc-1.0-publisher.html#EpcPublisher"><span class="type">EpcPublisher</span></a>
</div>
</div>
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