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  <li>Pipes</li>
  <li >SignatureUserPipe</li>
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        <p class="comment">
            <h3>File</h3>
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        <p class="comment">
            <code>src/app/shared/_pipes/signature-user.pipe.ts</code>
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        <section>
            <h3>Metadata</h3>
            <table class="table table-sm table-hover">
                <tbody>
                    <tr>
                        <td class="col-md-3">Name</td>
                        <td class="col-md-9">signatureUser</td>
                    </tr>
                </tbody>
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            <section>
    
    <h3 id="methods">
        Methods
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                <td class="col-md-4">
                    <a name="transform"></a>
                    <span class="name">
                        <span class="modifier">Async</span>
                        <span ><b>transform</b></span>
                        <a href="#transform"><span class="icon ion-ios-link"></span></a>
                    </span>
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                <td class="col-md-4">
                    <span class="modifier-icon icon ion-ios-reset"></span>
                    <code>transform(armoredSignature: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>, ...args: [])</code>
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                <td class="col-md-4">
                    <div class="io-line">Defined in <a href="" data-line="10"
                            class="link-to-prism">src/app/shared/_pipes/signature-user.pipe.ts:10</a></div>
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                    <div class="io-description">
                        <b>Parameters :</b>
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                                    <td>Name</td>
                                    <td>Type</td>
                                    <td>Optional</td>
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                                <tr>
                                    <td>armoredSignature</td>
                                    <td>
                                                <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
                                    </td>

                                    <td>
                                        No
                                    </td>


                                </tr>
                                <tr>
                                    <td>args</td>
                                    <td>
                                            <code>[]</code>
                                    </td>

                                    <td>
                                        No
                                    </td>


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                    <div class="io-description">
                        <b>Returns : </b>    <code>Promise&lt;string&gt;</code>

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    <div class="tab-pane fade  tab-source-code" id="c-source">
        <pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { Pipe, PipeTransform } from &#x27;@angular/core&#x27;;
import * as openpgp from &#x27;openpgp&#x27;;
import { asciiToHex } from &#x27;@app/_helpers&#x27;;
import { KeystoreService } from &#x27;@app/_services&#x27;;

@Pipe({
  name: &#x27;signatureUser&#x27;,
})
export class SignatureUserPipe implements PipeTransform {
  async transform(armoredSignature: string, ...args: unknown[]): Promise&lt;string&gt; {
    const keystore &#x3D; await KeystoreService.getKeystore();
    const signature &#x3D; await openpgp.signature.readArmored(armoredSignature);
    const keyId &#x3D; asciiToHex(signature.packets[0].issuerKeyId.bytes);
    const pubKey &#x3D; keystore.getPublicKeyForId(keyId);
    if (pubKey) {
      return pubKey.users[0].userId.userid;
    }
    return &#x27;&#x27;;
  }
}
</code></pre>
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