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<li>Interceptors</li>
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<li >ErrorInterceptor</li>
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</ol>
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<p class="comment">
<h3>File</h3>
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<code>src/app/_interceptors/error.interceptor.ts</code>
</p>
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<p class="comment">
<h3>Description</h3>
</p>
<p class="comment">
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<p>Intercepts and handles errors from outgoing HTTP request.</p>
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</p>
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<section>
<h3 id="index">Index</h3>
<table class="table table-sm table-bordered index-table">
<tbody>
<tr>
<td class="col-md-4">
<h6><b>Methods</b></h6>
</td>
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<td class="col-md-4">
<ul class="index-list">
<li>
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<a href="#intercept" >intercept</a>
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</li>
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</section>
<section>
<h3 id="constructor">Constructor</h3>
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<td class="col-md-4">
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<code>constructor(errorDialogService: <a href="../injectables/ErrorDialogService.html" target="_self">ErrorDialogService</a>, loggingService: <a href="../injectables/LoggingService.html" target="_self">LoggingService</a>, router: <a href="https://angular.io/api/router/Router" target="_blank">Router</a>)</code>
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</td>
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<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="21" class="link-to-prism">src/app/_interceptors/error.interceptor.ts:21</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Initialization of the error interceptor.</p>
</div>
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<div>
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
</thead>
<tbody>
<tr>
<td>errorDialogService</td>
<td>
<code><a href="../injectables/ErrorDialogService.html" target="_self" >ErrorDialogService</a></code>
</td>
<td>
No
</td>
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<td>
<code><ul>
<li>A service that provides a dialog box for displaying errors to the user.</li>
</ul>
</code>
</td>
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</tr>
<tr>
<td>loggingService</td>
<td>
<code><a href="../injectables/LoggingService.html" target="_self" >LoggingService</a></code>
</td>
<td>
No
</td>
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<td>
<code><ul>
<li>A service that provides logging capabilities.</li>
</ul>
</code>
</td>
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</tr>
<tr>
<td>router</td>
<td>
<code><a href="https://angular.io/api/router/Router" target="_blank" >Router</a></code>
</td>
<td>
No
</td>
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<td>
<code><ul>
<li>A service that provides navigation among views and URL manipulation capabilities.</li>
</ul>
</code>
</td>
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</tr>
</tbody>
</table>
</div>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="methods">
Methods
</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="intercept"></a>
<span class="name">
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<span ><b>intercept</b></span>
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<a href="#intercept"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
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<code>intercept(request: HttpRequest<>, next: <a href="https://angular.io/api/common/http/HttpHandler" target="_blank">HttpHandler</a>)</code>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-line">Defined in <a href="" data-line="42"
class="link-to-prism">src/app/_interceptors/error.interceptor.ts:42</a></div>
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</td>
</tr>
<tr>
<td class="col-md-4">
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<div class="io-description"><p>Intercepts HTTP requests.</p>
</div>
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<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>Description</td>
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</tr>
</thead>
<tbody>
<tr>
<td>request</td>
<td>
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<code>HttpRequest&lt;&gt;</code>
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</td>
<td>
No
</td>
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<td>
<ul>
<li>An outgoing HTTP request with an optional typed body.</li>
</ul>
</td>
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</tr>
<tr>
<td>next</td>
<td>
<code><a href="https://angular.io/api/common/http/HttpHandler" target="_blank" >HttpHandler</a></code>
</td>
<td>
No
</td>
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<td>
<ul>
<li>The next HTTP handler or the outgoing request dispatcher.</li>
</ul>
</td>
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</tr>
</tbody>
</table>
</div>
<div>
</div>
<div class="io-description">
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<b>Returns : </b> <code>Observable&lt;HttpEvent&lt;&gt;&gt;</code>
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</div>
<div class="io-description">
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<p>The error caught from the request.</p>
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</div>
</td>
</tr>
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</section>
</div>
<div class="tab-pane fade tab-source-code" id="c-source">
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<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import {
HttpErrorResponse,
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HttpEvent,
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HttpHandler,
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HttpInterceptor,
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HttpRequest,
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} from &#x27;@angular/common/http&#x27;;
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import { Injectable } from &#x27;@angular/core&#x27;;
import { Router } from &#x27;@angular/router&#x27;;
// Third party imports
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import { Observable, throwError } from &#x27;rxjs&#x27;;
import { catchError } from &#x27;rxjs/operators&#x27;;
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// Application imports
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import { ErrorDialogService, LoggingService } from &#x27;@app/_services&#x27;;
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/** Intercepts and handles errors from outgoing HTTP request. */
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@Injectable()
export class ErrorInterceptor implements HttpInterceptor {
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/**
* Initialization of the error interceptor.
*
* @param errorDialogService - A service that provides a dialog box for displaying errors to the user.
* @param loggingService - A service that provides logging capabilities.
* @param router - A service that provides navigation among views and URL manipulation capabilities.
*/
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constructor(
private errorDialogService: ErrorDialogService,
private loggingService: LoggingService,
private router: Router
) {}
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/**
* Intercepts HTTP requests.
*
* @param request - An outgoing HTTP request with an optional typed body.
* @param next - The next HTTP handler or the outgoing request dispatcher.
* @returns The error caught from the request.
*/
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intercept(request: HttpRequest&lt;unknown&gt;, next: HttpHandler): Observable&lt;HttpEvent&lt;unknown&gt;&gt; {
return next.handle(request).pipe(
catchError((err: HttpErrorResponse) &#x3D;&gt; {
let errorMessage: string;
if (err.error instanceof ErrorEvent) {
// A client-side or network error occurred. Handle it accordingly.
errorMessage &#x3D; &#x60;An error occurred: ${err.error.message}&#x60;;
} else {
// The backend returned an unsuccessful response code.
// The response body may contain clues as to what went wrong.
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errorMessage &#x3D; &#x60;Backend returned code ${err.status}, body was: ${JSON.stringify(
err.error
)}&#x60;;
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}
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this.loggingService.sendErrorLevelMessage(errorMessage, this, { error: err });
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switch (err.status) {
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case 401: // unauthorized
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this.router.navigateByUrl(&#x27;/auth&#x27;).then();
break;
case 403: // forbidden
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this.errorDialogService.openDialog({
message: &#x27;Access to resource is not allowed (Error 403)&#x27;,
});
// alert(&#x27;Access to resource is not allowed!&#x27;);
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break;
}
// Return an observable with a user-facing error message.
return throwError(err);
})
);
}
}
</code></pre>
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