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<h1><a href="../../../../index.html">All files</a> / <a href="index.html">src/mcp-server/resources/utils</a> resourceHandlerFactory.ts</h1>
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<span class="strong">2.27% </span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* @fileoverview A factory for registering standardized MCP resources from definitions.
* Encapsulates context creation, error handling, and response formatting, keeping
* resource logic pure and stateless.
* @module src/mcp-server/resources/utils/resourceHandlerFactory
*/
import {
McpServer,
ResourceTemplate,
} from '@modelcontextprotocol/sdk/server/mcp.js';
import type { ReadResourceResult } from '@modelcontextprotocol/sdk/types.js';
import type { ZodObject, ZodRawShape, z } from 'zod';
import type { ResourceDefinition } from '@/mcp-server/resources/utils/resourceDefinition.js';
import { JsonRpcErrorCode, McpError } from '@/types-global/errors.js';
import {
ErrorHandler,
type RequestContext,
logger,
requestContextService,
} from '@/utils/index.js';
/** Default formatter producing a single JSON text content block. */
type ResponseFormatter = (
result: unknown,
meta: { uri: URL; mimeType: string },
) => ReadResourceResult['contents'];
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function defaultResponseFormatter(</span></span>
<span class="cstat-no" title="statement not covered" > result: unknown,</span>
<span class="cstat-no" title="statement not covered" > meta: { uri: URL; mimeType: string },</span>
<span class="cstat-no" title="statement not covered" >): ReadResourceResult['contents'] {</span>
<span class="cstat-no" title="statement not covered" > return [</span>
<span class="cstat-no" title="statement not covered" > {</span>
<span class="cstat-no" title="statement not covered" > uri: meta.uri.href,</span>
<span class="cstat-no" title="statement not covered" > text: JSON.stringify(result),</span>
<span class="cstat-no" title="statement not covered" > mimeType: meta.mimeType,</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" ><span class="fstat-no" title="function not covered" >function ensureResourceContents(</span></span>
<span class="cstat-no" title="statement not covered" > contents: unknown,</span>
<span class="cstat-no" title="statement not covered" > handlerContext: RequestContext,</span>
<span class="cstat-no" title="statement not covered" > resourceName: string,</span>
<span class="cstat-no" title="statement not covered" > uri: URL,</span>
<span class="cstat-no" title="statement not covered" >): ReadResourceResult['contents'] {</span>
<span class="cstat-no" title="statement not covered" > if (!Array.isArray(contents)) {</span>
<span class="cstat-no" title="statement not covered" > throw new McpError(</span>
<span class="cstat-no" title="statement not covered" > JsonRpcErrorCode.InternalError,</span>
<span class="cstat-no" title="statement not covered" > 'Resource formatter must return an array of contents.',</span>
<span class="cstat-no" title="statement not covered" > {</span>
<span class="cstat-no" title="statement not covered" > requestId: handlerContext.requestId,</span>
<span class="cstat-no" title="statement not covered" > resourceName,</span>
<span class="cstat-no" title="statement not covered" > uri: uri.href,</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>
// We perform a shallow validation here. A full Zod schema validation would be safer
// but might be too slow for every resource call. This is a pragmatic trade-off.
<span class="cstat-no" title="statement not covered" > for (const item of contents) {</span>
<span class="cstat-no" title="statement not covered" > if (typeof item !== 'object' || item === null || !('uri' in item)) {</span>
<span class="cstat-no" title="statement not covered" > throw new McpError(</span>
<span class="cstat-no" title="statement not covered" > JsonRpcErrorCode.InternalError,</span>
<span class="cstat-no" title="statement not covered" > 'Invalid content block found in resource formatter output. Each item must be an object with a `uri` property.',</span>
<span class="cstat-no" title="statement not covered" > {</span>
<span class="cstat-no" title="statement not covered" > requestId: handlerContext.requestId,</span>
<span class="cstat-no" title="statement not covered" > resourceName,</span>
<span class="cstat-no" title="statement not covered" > uri: uri.href,</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" > }</span>
<span class="cstat-no" title="statement not covered" > return contents as ReadResourceResult['contents'];</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Registers a single resource definition with the provided MCP server.
*/
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >export async function registerResource<</span></span>
TParamsSchema extends ZodObject<ZodRawShape>,
TOutputSchema extends ZodObject<ZodRawShape> | undefined = undefined,
>(
<span class="cstat-no" title="statement not covered" > server: McpServer,</span>
<span class="cstat-no" title="statement not covered" > def: ResourceDefinition<TParamsSchema, TOutputSchema>,</span>
<span class="cstat-no" title="statement not covered" >): Promise<void> {</span>
<span class="cstat-no" title="statement not covered" > const resourceName = def.name;</span>
<span class="cstat-no" title="statement not covered" > const registrationContext: RequestContext =</span>
<span class="cstat-no" title="statement not covered" > requestContextService.createRequestContext({</span>
<span class="cstat-no" title="statement not covered" > operation: 'RegisterResource',</span>
<span class="cstat-no" title="statement not covered" > additionalContext: { resourceName },</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > logger.info(`Registering resource: '${resourceName}'`, registrationContext);</span>
<span class="cstat-no" title="statement not covered" > await ErrorHandler.tryCatch(</span>
<span class="cstat-no" title="statement not covered" > () => {</span>
<span class="cstat-no" title="statement not covered" > const template = new ResourceTemplate(def.uriTemplate, {</span>
<span class="cstat-no" title="statement not covered" > list: def.list,</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > const mimeType = def.mimeType ?? 'application/json';</span>
<span class="cstat-no" title="statement not covered" > const formatter: ResponseFormatter =</span>
<span class="cstat-no" title="statement not covered" > def.responseFormatter ?? defaultResponseFormatter;</span>
<span class="cstat-no" title="statement not covered" > const title = def.title ?? resourceName;</span>
<span class="cstat-no" title="statement not covered" > server.resource(</span>
<span class="cstat-no" title="statement not covered" > resourceName,</span>
<span class="cstat-no" title="statement not covered" > template,</span>
<span class="cstat-no" title="statement not covered" > {</span>
<span class="cstat-no" title="statement not covered" > name: title,</span>
<span class="cstat-no" title="statement not covered" > description: def.description,</span>
<span class="cstat-no" title="statement not covered" > mimeType,</span>
<span class="cstat-no" title="statement not covered" > ...(def.examples && { examples: def.examples }),</span>
<span class="cstat-no" title="statement not covered" > },</span>
<span class="cstat-no" title="statement not covered" > async (uri, params, callContext): Promise<ReadResourceResult> => {</span>
<span class="cstat-no" title="statement not covered" > const sessionId =</span>
<span class="cstat-no" title="statement not covered" > typeof callContext?.sessionId === 'string'</span>
<span class="cstat-no" title="statement not covered" > ? callContext.sessionId</span>
<span class="cstat-no" title="statement not covered" > : undefined;</span>
<span class="cstat-no" title="statement not covered" > const handlerContext: RequestContext =</span>
<span class="cstat-no" title="statement not covered" > requestContextService.createRequestContext({</span>
<span class="cstat-no" title="statement not covered" > parentContext: callContext,</span>
<span class="cstat-no" title="statement not covered" > operation: 'HandleResourceRead',</span>
<span class="cstat-no" title="statement not covered" > additionalContext: {</span>
<span class="cstat-no" title="statement not covered" > resourceUri: uri.href,</span>
<span class="cstat-no" title="statement not covered" > sessionId,</span>
<span class="cstat-no" title="statement not covered" > inputParams: params,</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" > try {</span>
// Validate params via the schema before invoking logic
type TParams = z.infer<TParamsSchema>;
type TOutput =
TOutputSchema extends ZodObject<ZodRawShape>
? z.infer<TOutputSchema>
: unknown;
<span class="cstat-no" title="statement not covered" > const parsedParams = def.paramsSchema.parse(params) as TParams;</span>
<span class="cstat-no" title="statement not covered" > const responseData = (await def.logic(</span>
<span class="cstat-no" title="statement not covered" > uri,</span>
<span class="cstat-no" title="statement not covered" > parsedParams,</span>
<span class="cstat-no" title="statement not covered" > handlerContext,</span>
<span class="cstat-no" title="statement not covered" > )) as TOutput;</span>
<span class="cstat-no" title="statement not covered" > const rawContents: unknown = formatter(responseData, {</span>
<span class="cstat-no" title="statement not covered" > uri,</span>
<span class="cstat-no" title="statement not covered" > mimeType,</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > const contents = ensureResourceContents(</span>
<span class="cstat-no" title="statement not covered" > rawContents,</span>
<span class="cstat-no" title="statement not covered" > handlerContext,</span>
<span class="cstat-no" title="statement not covered" > resourceName,</span>
<span class="cstat-no" title="statement not covered" > uri,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > const readResult: ReadResourceResult = { contents };</span>
<span class="cstat-no" title="statement not covered" > return readResult;</span>
<span class="cstat-no" title="statement not covered" > } catch (error) {</span>
// Centralized handler re-throws the error for the SDK to catch
<span class="cstat-no" title="statement not covered" > throw ErrorHandler.handleError(error, {</span>
<span class="cstat-no" title="statement not covered" > operation: `resource:${resourceName}:readHandler`,</span>
<span class="cstat-no" title="statement not covered" > context: handlerContext,</span>
<span class="cstat-no" title="statement not covered" > input: { uri: uri.href, params },</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" > );</span>
<span class="cstat-no" title="statement not covered" > logger.notice(</span>
<span class="cstat-no" title="statement not covered" > `Resource '${resourceName}' registered successfully.`,</span>
<span class="cstat-no" title="statement not covered" > registrationContext,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > },</span>
<span class="cstat-no" title="statement not covered" > {</span>
<span class="cstat-no" title="statement not covered" > operation: `RegisteringResource_${resourceName}`,</span>
<span class="cstat-no" title="statement not covered" > context: registrationContext,</span>
<span class="cstat-no" title="statement not covered" > errorCode: JsonRpcErrorCode.InitializationFailed,</span>
<span class="cstat-no" title="statement not covered" > critical: true,</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>
</pre></td></tr></table></pre>
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