MCP Base

server
resources
server/resources/sample-resource.ts
// Sample MCP Resource Template
import { McpServer, ResourceTemplate } from "@modelcontextprotocol/sdk/server/mcp.js";

/**
 * Register sample resources with the MCP server
 * @param server The MCP server instance
 * @param supabase The Supabase client (optional)
 */
export function registerSampleResources(
  server: McpServer,
  supabase: any = null
) {
  // List all items
  server.resource("all-items", "items://all", async (uri) => {
    try {
      console.log("Fetching all items...");
      
      // Example: Fetch data from a Supabase table if available
      let data;
      if (supabase) {
        // const { data: fetchedData, error } = await supabase
        //   .from("items")
        //   .select("id, name, description");
        // 
        // if (error) throw error;
        // data = fetchedData;
      } else {
        console.log("Supabase not available, using mock data");
      }
      
      // For this template, let's return mock data
      data = [
        { id: 1, name: "Item 1", description: "Description of item 1" },
        { id: 2, name: "Item 2", description: "Description of item 2" },
        { id: 3, name: "Item 3", description: "Description of item 3" },
      ];
      
      console.log("Items fetched successfully");
      return {
        contents: [
          {
            uri: uri.href,
            text: JSON.stringify(data, null, 2),
          },
        ],
      };
    } catch (error) {
      console.error("Error fetching items:", error);
      throw error;
    }
  });

  // Get item by ID
  server.resource(
    "item-by-id",
    new ResourceTemplate("items://{id}", { list: undefined }),
    async (uri, { id }) => {
      try {
        console.log(`Fetching item with ID: ${id}`);
        
        // Example: Fetch data from a Supabase table by ID if available
        let data;
        if (supabase) {
          // const { data: fetchedData, error } = await supabase
          //   .from("items")
          //   .select("*")
          //   .eq("id", id)
          //   .single();
          // 
          // if (error) throw error;
          // data = fetchedData;
        } else {
          console.log("Supabase not available, using mock data");
        }
        
        // For this template, let's return mock data
        data = { 
          id: parseInt(id), 
          name: `Item ${id}`, 
          description: `Description of item ${id}`,
          properties: {
            color: "blue",
            size: "medium",
            tags: ["sample", "template", "example"]
          }
        };
        
        console.log(`Item with ID ${id} fetched successfully`);
        return {
          contents: [
            {
              uri: uri.href,
              text: JSON.stringify(data, null, 2),
            },
          ],
        };
      } catch (error) {
        console.error(`Error fetching item with ID ${id}:`, error);
        throw error;
      }
    }
  );

  // Get items by category
  server.resource(
    "items-by-category",
    new ResourceTemplate("items://category/{category}", { list: undefined }),
    async (uri, { category }) => {
      try {
        console.log(`Fetching items for category: ${category}`);
        
        // Example: Fetch data from a Supabase table by category if available
        let data;
        if (supabase) {
          // const { data: fetchedData, error } = await supabase
          //   .from("items")
          //   .select("id, name, description")
          //   .eq("category", category);
          // 
          // if (error) throw error;
          // data = fetchedData;
        } else {
          console.log("Supabase not available, using mock data");
        }
        
        // For this template, let's return mock data
        data = [
          { id: 1, name: `${category} Item 1`, description: `${category} description 1` },
          { id: 2, name: `${category} Item 2`, description: `${category} description 2` },
        ];
        
        console.log(`Items for category ${category} fetched successfully`);
        return {
          contents: [
            {
              uri: uri.href,
              text: JSON.stringify(data, null, 2),
            },
          ],
        };
      } catch (error) {
        console.error(`Error fetching items for category ${category}:`, error);
        throw error;
      }
    }
  );
}