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	<h1 class="page-title">Namespace: credentials</h1>
<section>

<header>
    
        <h2>
            <span class="ancestors"><a href="grpc.html">grpc</a>.</span>
        
        credentials
        </h2>
        
    
</header>


<article>
    <div class="container-overview">
    
        
            <div class="description"><p>Credentials module</p>
<p>This module contains factory methods for two different credential types:
CallCredentials and ChannelCredentials. ChannelCredentials are things like
SSL credentials that can be used to secure a connection, and are used to
construct a Client object. CallCredentials genrally modify metadata, so they
can be attached to an individual method call.</p>
<p>CallCredentials can be composed with other CallCredentials to create
CallCredentials. ChannelCredentials can be composed with CallCredentials
to create ChannelCredentials. No combined credential can have more than
one ChannelCredentials.</p>
<p>For example, to create a client secured with SSL that uses Google
default application credentials to authenticate:</p></div>
        

<dl class="details">
    

</dl>


            <h3>Example</h3>
            
    <pre class="sunlight-highlight-javascript">var channel_creds = credentials.createSsl(root_certs);
(new GoogleAuth()).getApplicationDefault(function(err, credential) {
  var call_creds = credentials.createFromGoogleCredential(credential);
  var combined_creds = credentials.combineChannelCredentials(
      channel_creds, call_creds);
  var client = new Client(address, combined_creds);
});</pre>


    </div>

    
        <h3 class="subsection-title">Classes</h3>

        <dl>
            <dt><a href="grpc.credentials-CallCredentials.html">CallCredentials</a></dt>
            <dd></dd>
        
            <dt><a href="grpc.credentials-ChannelCredentials.html">ChannelCredentials</a></dt>
            <dd></dd>
        </dl>
    

        <h3 class="subsection-title">Methods</h3>

        <dl>
            
<hr>
<dt>
    <h4 class="name" id=".combineCallCredentials"><span class="type-signature">&lt;static> </span>combineCallCredentials(credentials)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Combine any number of CallCredentials into a single CallCredentials object</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>credentials</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials-CallCredentials.html">grpc.credentials~CallCredentials</a></span>


            </td>

            
                <td class="attributes">
                

                    &lt;repeatable><br>
                
                </td>
            

            <td class="description last"><p>The CallCredentials to compose</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>A credentials object that combines all of the input
    credentials</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.credentials-CallCredentials.html">grpc.credentials~CallCredentials</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id=".combineChannelCredentials"><span class="type-signature">&lt;static> </span>combineChannelCredentials(channel_credential, credentials)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Combine a ChannelCredentials with any number of CallCredentials into a single
ChannelCredentials object.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>channel_credential</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials-ChannelCredentials.html">grpc.credentials~ChannelCredentials</a></span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>The ChannelCredentials to
    start with</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>credentials</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials-CallCredentials.html">grpc.credentials~CallCredentials</a></span>


            </td>

            
                <td class="attributes">
                

                    &lt;repeatable><br>
                
                </td>
            

            <td class="description last"><p>The CallCredentials to compose</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>A credentials object that combines all of the
    input credentials</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.credentials-ChannelCredentials.html">grpc.credentials~ChannelCredentials</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id=".createFromGoogleCredential"><span class="type-signature">&lt;static> </span>createFromGoogleCredential(google_credential)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Create a gRPC credential from a Google credential object.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>google_credential</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="external-GoogleCredential.html">external:GoogleCredential</a></span>


            </td>

            
            <td class="description last"><p>The Google credential
    object to use</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The resulting credentials object</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.credentials-CallCredentials.html">grpc.credentials~CallCredentials</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id=".createFromMetadataGenerator"><span class="type-signature">&lt;static> </span>createFromMetadataGenerator(metadata_generator)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Create a gRPC credentials object from a metadata generation function. This
function gets the service URL and a callback as parameters. The error
passed to the callback can optionally have a 'code' value attached to it,
which corresponds to a status code that this library uses.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>metadata_generator</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials.html#~generateMetadata">grpc.credentials~generateMetadata</a></span>


            </td>

            
            <td class="description last"><p>The function
    that generates metadata</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The credentials object</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.credentials-CallCredentials.html">grpc.credentials~CallCredentials</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id=".createInsecure"><span class="type-signature">&lt;static> </span>createInsecure()</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Create an insecure credentials object. This is used to create a channel that
does not use SSL. This cannot be composed with anything.</p>
    </div>
    

<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The insecure credentials object</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.credentials-ChannelCredentials.html">grpc.credentials~ChannelCredentials</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id=".createSsl"><span class="type-signature">&lt;static> </span>createSsl( [root_certs] [, private_key] [, cert_chain])</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Create an SSL Credentials object. If using a client-side certificate, both
the second and third arguments must be passed. Additional peer verification
options can be passed in the fourth argument as described below.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>root_certs</code></td>
            

            <td class="type">
            
                
<span class="param-type">Buffer</span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>The root certificate data</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>private_key</code></td>
            

            <td class="type">
            
                
<span class="param-type">Buffer</span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>The client certificate private key, if
    applicable</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>cert_chain</code></td>
            

            <td class="type">
            
                
<span class="param-type">Buffer</span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>The client certificate cert chain, if applicable</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>verify_options.checkServerIdentity</code></td>
            

            <td class="type">
            
                
<span class="param-type">function</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>Optional callback
    receiving the expected hostname and peer certificate for additional
    verification. The callback should return an Error if verification
    fails and otherwise return undefined.</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The SSL Credentials object</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.credentials-ChannelCredentials.html">grpc.credentials~ChannelCredentials</a></span>


    </dd>
</dl>


</dd>

        </dl>
    

        <h3 class="subsection-title">Type Definitions</h3>

        <dl>
                
<hr>
<dt>
    <h4 class="name" id="~generateMetadata"><span class="type-signature"></span>generateMetadata(params, callback)</h4>
    
    
</dt>
<dd>

    
        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>params</code></td>
            

            <td class="type">
            
                
<span class="param-type">Object</span>


            </td>

            
            <td class="description last"><p>Parameters that can modify metadata generation</p>
                <h6 class="method-params-label method-subparams-label">Properties</h6>
                

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>service_url</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
            <td class="description last"><p>The URL of the service that the call is
    going to</p></td>
        </tr>

    
    </tbody>
</table>

            </td>
        </tr>

    
        <tr>
            
                <td class="name"><code>callback</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.credentials.html#~metadataCallback">grpc.credentials~metadataCallback</a></span>


            </td>

            
            <td class="description last"></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

            
<hr>
<dt>
    <h4 class="name" id="~metadataCallback"><span class="type-signature"></span>metadataCallback(error, metadata)</h4>
    
    
</dt>
<dd>

    
        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>error</code></td>
            

            <td class="type">
            
                
<span class="param-type">Error</span>


            </td>

            
            <td class="description last"><p>The error, if getting metadata failed</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>metadata</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Metadata.html">grpc.Metadata</a></span>


            </td>

            
            <td class="description last"><p>The metadata</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

            </dl>
    

</article>

</section>


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