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<h1><a href="../../../../index.html">All files</a> / <a href="index.html">src/mcp-server/resources/definitions</a> echo.resource.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* @fileoverview Echo resource definition using the new declarative pattern.
* Provides a pure logic function and schema-driven params, registered via the
* generic resource registrar.
* @module src/mcp-server/resources/definitions/echo.resource
*/
<span class="cstat-no" title="statement not covered" >import { z } from 'zod';</span>
<span class="cstat-no" title="statement not covered" >import { type RequestContext, logger } from '@/utils/index.js';</span>
<span class="cstat-no" title="statement not covered" >import { withResourceAuth } from '@/mcp-server/transports/auth/lib/withAuth.js';</span>
<span class="cstat-no" title="statement not covered" >import { type ResourceDefinition } from '@/mcp-server/resources/utils/resourceDefinition.js';</span>
<span class="cstat-no" title="statement not covered" >const ParamsSchema = z</span>
<span class="cstat-no" title="statement not covered" > .object({</span>
<span class="cstat-no" title="statement not covered" > message: z</span>
<span class="cstat-no" title="statement not covered" > .string()</span>
<span class="cstat-no" title="statement not covered" > .optional()</span>
<span class="cstat-no" title="statement not covered" > .describe(</span>
<span class="cstat-no" title="statement not covered" > 'Optional message to echo back. If omitted, it may be derived from the URI path/host.',</span>
<span class="cstat-no" title="statement not covered" > ),</span>
<span class="cstat-no" title="statement not covered" > })</span>
<span class="cstat-no" title="statement not covered" > .describe('Echo resource parameters.');</span>
<span class="cstat-no" title="statement not covered" >const OutputSchema = z</span>
<span class="cstat-no" title="statement not covered" > .object({</span>
<span class="cstat-no" title="statement not covered" > message: z.string().describe('The echoed message.'),</span>
<span class="cstat-no" title="statement not covered" > timestamp: z</span>
<span class="cstat-no" title="statement not covered" > .string()</span>
<span class="cstat-no" title="statement not covered" > .datetime()</span>
<span class="cstat-no" title="statement not covered" > .describe('ISO 8601 timestamp when the response was generated.'),</span>
<span class="cstat-no" title="statement not covered" > requestUri: z</span>
<span class="cstat-no" title="statement not covered" > .string()</span>
<span class="cstat-no" title="statement not covered" > .url()</span>
<span class="cstat-no" title="statement not covered" > .describe('The request URI used to fetch this resource.'),</span>
<span class="cstat-no" title="statement not covered" > })</span>
<span class="cstat-no" title="statement not covered" > .describe('Echo resource response payload.');</span>
type EchoParams = z.infer<typeof ParamsSchema>;
type EchoOutput = z.infer<typeof OutputSchema>;
<span class="cstat-no" title="statement not covered" >function echoLogic(</span>
<span class="cstat-no" title="statement not covered" > uri: URL,</span>
<span class="cstat-no" title="statement not covered" > params: EchoParams,</span>
<span class="cstat-no" title="statement not covered" > context: RequestContext,</span>
<span class="cstat-no" title="statement not covered" >): EchoOutput {</span>
<span class="cstat-no" title="statement not covered" > const messageFromPath = uri.hostname || uri.pathname.replace(/^\/+/, '');</span>
<span class="cstat-no" title="statement not covered" > const messageToEcho =</span>
<span class="cstat-no" title="statement not covered" > params.message || messageFromPath || 'Default echo message';</span>
<span class="cstat-no" title="statement not covered" > logger.debug('Processing echo resource logic.', {</span>
<span class="cstat-no" title="statement not covered" > ...context,</span>
<span class="cstat-no" title="statement not covered" > resourceUri: uri.href,</span>
<span class="cstat-no" title="statement not covered" > extractedMessage: messageToEcho,</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > const responsePayload: EchoOutput = {</span>
<span class="cstat-no" title="statement not covered" > message: messageToEcho,</span>
<span class="cstat-no" title="statement not covered" > timestamp: new Date().toISOString(),</span>
<span class="cstat-no" title="statement not covered" > requestUri: uri.href,</span>
<span class="cstat-no" title="statement not covered" > };</span>
<span class="cstat-no" title="statement not covered" > logger.debug('Echo resource processed successfully.', {</span>
<span class="cstat-no" title="statement not covered" > ...context,</span>
<span class="cstat-no" title="statement not covered" > responsePayloadSummary: {</span>
<span class="cstat-no" title="statement not covered" > messageLength: responsePayload.message.length,</span>
<span class="cstat-no" title="statement not covered" > },</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > return responsePayload;</span>
<span class="cstat-no" title="statement not covered" >}</span>
<span class="cstat-no" title="statement not covered" >export const echoResourceDefinition: ResourceDefinition<</span>
typeof ParamsSchema,
typeof OutputSchema
<span class="cstat-no" title="statement not covered" >> = {</span>
<span class="cstat-no" title="statement not covered" > name: 'echo-resource',</span>
<span class="cstat-no" title="statement not covered" > title: 'Echo Message Resource',</span>
<span class="cstat-no" title="statement not covered" > description: 'A simple echo resource that returns a message.',</span>
<span class="cstat-no" title="statement not covered" > uriTemplate: 'echo://{message}',</span>
<span class="cstat-no" title="statement not covered" > paramsSchema: ParamsSchema,</span>
<span class="cstat-no" title="statement not covered" > outputSchema: OutputSchema,</span>
<span class="cstat-no" title="statement not covered" > mimeType: 'application/json',</span>
<span class="cstat-no" title="statement not covered" > examples: [{ name: 'Basic echo', uri: 'echo://hello' }],</span>
<span class="cstat-no" title="statement not covered" > annotations: { readOnlyHint: true },</span>
<span class="cstat-no" title="statement not covered" > list: () => ({</span>
<span class="cstat-no" title="statement not covered" > resources: [</span>
<span class="cstat-no" title="statement not covered" > {</span>
<span class="cstat-no" title="statement not covered" > uri: 'echo://hello',</span>
<span class="cstat-no" title="statement not covered" > name: 'Default Echo Message',</span>
<span class="cstat-no" title="statement not covered" > description: 'A simple echo resource example.',</span>
<span class="cstat-no" title="statement not covered" > },</span>
<span class="cstat-no" title="statement not covered" > ],</span>
<span class="cstat-no" title="statement not covered" > }),</span>
<span class="cstat-no" title="statement not covered" > logic: withResourceAuth(['resource:echo:read'], echoLogic),</span>
<span class="cstat-no" title="statement not covered" >};</span>
</pre></td></tr></table></pre>
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