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<h2 class="class-name">Class Auth_OpenID_SessionNegotiator</h2>

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	<div class="info-box-title">Description</div>
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<p class="short-description">A session negotiator controls the allowed and preferred association  types and association session types. Both the <a href="../OpenID/Auth_OpenID_Consumer.html">Auth_OpenID_Consumer</a> and <a href="../OpenID/Auth_OpenID_Server.html">Auth_OpenID_Server</a> use  negotiators when creating associations.</p>
<p class="description"><p>You can create and use negotiators if you: <ul><li>Do not want to do Diffie-Hellman key exchange because you use</li></ul> transport-layer encryption (e.g. SSL)</p><p><ul><li>Want to use only SHA-256 associations</li></ul> <ul><li>Do not want to support plain-text associations over a non-secure</li></ul> channel</p><p>It is up to you to set a policy for what kinds of associations to  accept. By default, the library will make any kind of association  that is allowed in the OpenID 2.0 specification.</p><p>Use of negotiators in the library  =================================</p><p>When a consumer makes an association request, it calls <a href="../OpenID/Auth_OpenID_SessionNegotiator.html#methodgetAllowedType">getAllowedType</a> to get the preferred association type and  association session type.</p><p>The server gets a request for a particular association/session type  and calls <a href="../OpenID/Auth_OpenID_SessionNegotiator.html#methodisAllowed">isAllowed</a> to determine if it should create an  association. If it is supported, negotiation is complete. If it is  not, the server calls <a href="../OpenID/Auth_OpenID_SessionNegotiator.html#methodgetAllowedType">getAllowedType</a> to get an allowed  association type to return to the consumer.</p><p>If the consumer gets an error response indicating that the  requested association/session type is not supported by the server  that contains an assocation/session type to try, it calls <a href="../OpenID/Auth_OpenID_SessionNegotiator.html#methodisAllowed">isAllowed</a> to determine if it should try again with the given  combination of association/session type.</p></p>
		<p class="notes">
			Located in <a class="field" href="_Auth---OpenID---Association.php.html">/Auth/OpenID/Association.php</a> (line <span class="field">527</span>)
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											<span class="method-result">Auth_OpenID_SessionNegotiator</span>
										<a href="#Auth_OpenID_SessionNegotiator" title="details" class="method-name">Auth_OpenID_SessionNegotiator</a>
											(<span class="var-type"></span>&nbsp;<span class="var-name">$allowed_types</span>)
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											<span class="method-result">void</span>
										<a href="#getAllowedType" title="details" class="method-name">getAllowedType</a>
										()
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											<span class="method-result">void</span>
										<a href="#isAllowed" title="details" class="method-name">isAllowed</a>
											(<span class="var-type"></span>&nbsp;<span class="var-name">$assoc_type</span>, <span class="var-type"></span>&nbsp;<span class="var-name">$session_type</span>)
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<a name="methodAuth_OpenID_SessionNegotiator" id="Auth_OpenID_SessionNegotiator"><!-- --></a>
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		<span class="method-title">Constructor Auth_OpenID_SessionNegotiator</span> (line <span class="line-number">528</span>)
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	<div class="method-signature">
		<span class="method-result">Auth_OpenID_SessionNegotiator</span>
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			Auth_OpenID_SessionNegotiator
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					(<span class="var-type"></span>&nbsp;<span class="var-name">$allowed_types</span>)
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					<li>
				<span class="var-type"></span>
				<span class="var-name">$allowed_types</span>			</li>
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		<span class="method-title">getAllowedType</span> (line <span class="line-number">603</span>)
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<p class="short-description">Get a pair of assocation type and session type that are  supported.</p>
	
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		<span class="method-result">void</span>
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			getAllowedType
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				()
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<a name="methodisAllowed" id="isAllowed"><!-- --></a>
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		<span class="method-title">isAllowed</span> (line <span class="line-number">588</span>)
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		<span class="method-result">void</span>
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			isAllowed
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					(<span class="var-type"></span>&nbsp;<span class="var-name">$assoc_type</span>, <span class="var-type"></span>&nbsp;<span class="var-name">$session_type</span>)
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					<li>
				<span class="var-type"></span>
				<span class="var-name">$assoc_type</span>			</li>
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				<span class="var-name">$session_type</span>			</li>
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	<p class="notes" id="credit">
		Documentation generated on Tue, 21 Apr 2009 11:31:29 -0700 by <a href="http://www.phpdoc.org" target="_blank">phpDocumentor 1.3.2</a>
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