[WIP] Refactor everything server to be more modular and use recommended APIs.

* Updated architecture.md

* Refactor/renamed resources/dynamic.ts to resources/template.ts
  - refactor/renamed registerDynamicResources to registerResourceTemplates
    - this highlights the more salient fact that we are demonstrating registration of resource templates in this example.
  - exposed the ability to dynamically create the text resources from elsewhere (namely the resource-prompt example

* Added prompts/resource.ts
  - in registerEmbeddedResourcePrompt()
    - register a prompt that takes a resourceId and returns the prompt with the corresponding dynamically created resource embedded

src/everything/resources/index.ts

@@ -1,5 +1,5 @@
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
-import { registerDynamicResources } from "./dynamic.js";
+import { registerResourceTemplates } from "./template.js";
 import { registerStaticResources } from "./static.js";
 
 /**
@@ -7,6 +7,6 @@ import { registerStaticResources } from "./static.js";
  * @param server
  */
 export const registerResources = (server: McpServer) => {
-  registerDynamicResources(server);
+  registerResourceTemplates(server);
   registerStaticResources(server);
 };

src/everything/resources/template.ts

@@ -0,0 +1,117 @@
+import {
+  McpServer,
+  ResourceTemplate,
+} from "@modelcontextprotocol/sdk/server/mcp.js";
+
+const uriBase: string = "demo://resource/dynamic";
+const textUriBase: string = `${uriBase}/text`;
+const blobUriBase: string = `${uriBase}/blob`;
+const textUriTemplate: string = `${textUriBase}/{index}`;
+const blobUriTemplate: string = `${blobUriBase}/{index}`;
+
+/**
+ * Create a dynamic text resource
+ * @param uri
+ * @param index
+ */
+export const textResource = (uri: URL, index: number) => {
+  const timestamp = new Date().toLocaleTimeString();
+  return {
+    uri: uri.toString(),
+    mimeType: "text/plain",
+    text: `Resource ${index}: This is a plaintext resource created at ${timestamp}`,
+  };
+};
+
+/**
+ * Create a dynamic blob resource
+ * @param uri
+ * @param index
+ */
+export const blobResource = (uri: URL, index: number) => {
+  const timestamp = new Date().toLocaleTimeString();
+  const resourceText = Buffer.from(
+    `Resource ${index}: This is a base64 blob created at ${timestamp}`
+  ).toString("base64");
+  return {
+    uri: uri.toString(),
+    mimeType: "text/plain",
+    text: resourceText,
+  };
+};
+
+/**
+ * Create a dynamic text resource URI
+ * @param index
+ */
+export const textResourceUri = (index: number) =>
+  new URL(`${textUriBase}/${index}`);
+
+/**
+ * Register resource templates with the MCP server.
+ *
+ * - Text and blob resources, dynamically generated from the URI {index} variable
+ * - Any finite integer is acceptable for the index variable
+ * - List resources method will not return these resources
+ * - These are only accessible via template URIs
+ * - Both blob and text resources:
+ *   - have content that is dynamically generated, including a timestamp
+ *   - have different template URIs
+ *     - Blob: "demo://resource/dynamic/blob/{index}"
+ *     - Text: "demo://resource/dynamic/text/{index}"
+ *
+ * @param server
+ */
+export const registerResourceTemplates = (server: McpServer) => {
+  const parseIndex = (uri: URL, variables: Record<string, unknown>) => {
+    const uriError = `Unknown resource: ${uri.toString()}`;
+    if (
+      uri.toString().startsWith(textUriBase) &&
+      uri.toString().startsWith(blobUriBase)
+    ) {
+      throw new Error(uriError);
+    } else {
+      const idxStr = String((variables as any).index ?? "");
+      const idx = Number(idxStr);
+      if (Number.isFinite(idx) && Number.isInteger(idx)) {
+        return idx;
+      } else {
+        throw new Error(uriError);
+      }
+    }
+  };
+
+  // Text resource template registration
+  server.registerResource(
+    "Dynamic Text Resource",
+    new ResourceTemplate(textUriTemplate, { list: undefined }),
+    {
+      mimeType: "text/plain",
+      description:
+        "Plaintext dynamic resource fabricated from the {index} variable, which must be an integer.",
+    },
+    async (uri, variables) => {
+      const index = parseIndex(uri, variables);
+      return {
+        contents: [textResource(uri, index)],
+      };
+    }
+  );
+
+  // Blob resource template registration
+  server.registerResource(
+    "Dynamic Blob Resource",
+    new ResourceTemplate(blobUriTemplate, { list: undefined }),
+    {
+      mimeType: "application/octet-stream",
+      description:
+        "Binary (base64) dynamic resource fabricated from the {index} variable, which must be an integer.",
+    },
+    async (uri, variables) => {
+      const index = parseIndex(uri, variables);
+      return {
+        contents: [blobResource(uri, index)],
+      };
+    }
+  );
+};