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    <title>JSDoc: Namespace: credentials</title>

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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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line34">line 34</a>
    </li></ul></dd>
    

</dl>


            <h3>Example</h3>
            
    <pre class="prettyprint"><code>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);
});</code></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>

        
    <h4 class="name" id=".combineCallCredentials"><span class="type-signature">(static) </span>combineCallCredentials<span class="signature">(&hellip;credentials)</span><span class="type-signature"></span></h4>

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


    <h5>Parameters:</h5>
    

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

        <th>Type</th>

        
        <th>Attributes</th>
        

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

    <tbody>
    

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

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

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line206">line 206</a>
    </li></ul></dd>
    

</dl>


<h5>Returns:</h5>

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


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

    
<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">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Attributes</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">ChannelCredentials</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">CallCredentials</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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line190">line 190</a>
    </li></ul></dd>
    

</dl>


<h5>Returns:</h5>

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


    <h4 class="name" id=".createFromGoogleCredential"><span class="type-signature">(static) </span>createFromGoogleCredential<span class="signature">(google_credential)</span><span class="type-signature"> &rarr; {grpc.credentials.CallCredentials}</span></h4>

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


    <h5>Parameters:</h5>
    

<table class="params">
    <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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line163">line 163</a>
    </li></ul></dd>
    

</dl>


<h5>Returns:</h5>

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


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


    </dd>
</dl>

    
    <h4 class="name" id=".createFromMetadataGenerator"><span class="type-signature">(static) </span>createFromMetadataGenerator<span class="signature">(metadata_generator)</span><span class="type-signature"> &rarr; {grpc.credentials.CallCredentials}</span></h4>

    
<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">
    <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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line133">line 133</a>
    </li></ul></dd>
    

</dl>


<h5>Returns:</h5>

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


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


    </dd>
</dl>

    
    <h4 class="name" id=".createInsecure"><span class="type-signature">(static) </span>createInsecure<span class="signature">()</span><span class="type-signature"> &rarr; {ChannelCredentials}</span></h4>

    
<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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line222">line 222</a>
    </li></ul></dd>
    

</dl>


<h5>Returns:</h5>

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


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type">ChannelCredentials</span>


    </dd>
</dl>

    
    <h4 class="name" id=".createSsl"><span class="type-signature">(static) </span>createSsl<span class="signature">(root_certs, private_key<span class="signature-attributes">opt</span>, cert_chain<span class="signature-attributes">opt</span>)</span><span class="type-signature"> &rarr; {grpc.credentials.ChannelCredentials}</span></h4>

    
<div class="description">
    <p>Create an SSL Credentials object. If using a client-side certificate, both
the second and third arguments must be passed.</p>
</div>


    <h5>Parameters:</h5>
    

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

        <th>Type</th>

        
        <th>Attributes</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">
                

                </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>

    
    </tbody>
</table>


<dl class="details">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line106">line 106</a>
    </li></ul></dd>
    

</dl>


<h5>Returns:</h5>

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


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


    </dd>
</dl>

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

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

    
    <h5>Parameters:</h5>
    

<table class="params">
    <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>Properties</h6>
                

<table class="params">
    <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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line114">line 114</a>
    </li></ul></dd>
    

</dl>


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

    
    <h5>Parameters:</h5>
    

<table class="params">
    <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">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="src_credentials.js.html">src/credentials.js</a>, <a href="src_credentials.js.html#line108">line 108</a>
    </li></ul></dd>
    

</dl>


</article>

</section>


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    <h2><a href="index.html">Home</a></h2><h3>Externals</h3><ul><li><a href="external-Duplex.html">Duplex</a></li><li><a href="external-EventEmitter.html">EventEmitter</a></li><li><a href="external-GoogleCredential.html">GoogleCredential</a></li><li><a href="external-Readable.html">Readable</a></li><li><a href="external-Writable.html">Writable</a></li></ul><h3>Classes</h3><ul><li><a href="grpc.Client.html">Client</a></li><li><a href="grpc.credentials-CallCredentials.html">CallCredentials</a></li><li><a href="grpc.credentials-ChannelCredentials.html">ChannelCredentials</a></li><li><a href="grpc.Metadata.html">Metadata</a></li><li><a href="grpc.Server.html">Server</a></li><li><a href="grpc.ServerCredentials.html">ServerCredentials</a></li><li><a href="grpc-ClientDuplexStream.html">ClientDuplexStream</a></li><li><a href="grpc-ClientReadableStream.html">ClientReadableStream</a></li><li><a href="grpc-ClientUnaryCall.html">ClientUnaryCall</a></li><li><a href="grpc-ClientWritableStream.html">ClientWritableStream</a></li><li><a href="grpc-ServerDuplexStream.html">ServerDuplexStream</a></li><li><a href="grpc-ServerReadableStream.html">ServerReadableStream</a></li><li><a href="grpc-ServerUnaryCall.html">ServerUnaryCall</a></li><li><a href="grpc-ServerWritableStream.html">ServerWritableStream</a></li></ul><h3>Events</h3><ul><li><a href="grpc-ClientDuplexStream.html#event:metadata">metadata</a></li><li><a href="grpc-ClientDuplexStream.html#event:status">status</a></li><li><a href="grpc-ClientReadableStream.html#event:metadata">metadata</a></li><li><a href="grpc-ClientReadableStream.html#event:status">status</a></li><li><a href="grpc-ClientUnaryCall.html#event:metadata">metadata</a></li><li><a href="grpc-ClientUnaryCall.html#event:status">status</a></li><li><a href="grpc-ClientWritableStream.html#event:metadata">metadata</a></li><li><a href="grpc-ClientWritableStream.html#event:status">status</a></li><li><a href="grpc-ServerDuplexStream.html#~event:cancelled">cancelled</a></li><li><a href="grpc-ServerReadableStream.html#~event:cancelled">cancelled</a></li><li><a href="grpc-ServerUnaryCall.html#~event:cancelled">cancelled</a></li><li><a href="grpc-ServerWritableStream.html#~event:cancelled">cancelled</a></li></ul><h3>Namespaces</h3><ul><li><a href="grpc.html">grpc</a></li><li><a href="grpc.credentials.html">credentials</a></li></ul>
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