/**
* @file Resources Router (targets expenses endpoints to avoid handler override issues)
*/
import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { ReadResourceRequestSchema } from "@modelcontextprotocol/sdk/types.js";
import { ResourceTemplate } from "../models/resourceTemplate.js";
import { BrexClient } from "../services/brex/client.js";
// Router uses BrexClient and response limiter; logs handled at higher layers
import { ListExpensesParams, isExpense, ExpenseType } from "../services/brex/expenses-types.js";
import { parseQueryParams } from "../models/common.js";
import { limitExpensesPayload } from "../utils/responseLimiter.js";
const expensesTemplate = new ResourceTemplate("brex://expenses{/id}");
const cardExpensesTemplate = new ResourceTemplate("brex://expenses/card{/id}");
function getClient(): BrexClient { return new BrexClient(); }
export function registerResourcesRouter(server: Server): void {
// Register as the last handler to take precedence
server.setRequestHandler(ReadResourceRequestSchema, async (request: unknown) => {
const req = request as { params: { uri: string } };
const uri = req.params.uri;
// Route: expenses (non-card)
if (uri.startsWith("brex://expenses") && !uri.includes("/card")) {
const brex = getClient();
const params = expensesTemplate.parse(uri);
const qp = parseQueryParams(uri);
const fields = qp.fields ? qp.fields.split(',').map(s => s.trim()).filter(Boolean) : undefined;
const summaryOnly = qp.summary_only === 'true';
if (!params.id) {
const req: ListExpensesParams = { limit: 50, expand: ['merchant','budget'] };
const resp = await brex.getExpenses(req);
const limited = limitExpensesPayload(resp.items as any, { summaryOnly, fields, hardTokenLimit: 24000 });
return { contents: [{ uri, mimeType: "application/json", text: JSON.stringify(limited.items, null, 2) }] } as any;
} else {
const exp = await brex.getExpense(params.id, { expand: ['merchant','budget','location','department','receipts.download_uris'], load_custom_fields: true });
if (!isExpense(exp)) throw new Error('Invalid expense');
const limited = limitExpensesPayload([exp] as any, { summaryOnly, fields, hardTokenLimit: 24000 });
return { contents: [{ uri, mimeType: "application/json", text: JSON.stringify(limited.items[0] || {}, null, 2) }] } as any;
}
}
// Route: card expenses
if (uri.startsWith("brex://expenses/card")) {
const brex = getClient();
const params = cardExpensesTemplate.parse(uri);
const qp = parseQueryParams(uri);
const fields = qp.fields ? qp.fields.split(',').map(s => s.trim()).filter(Boolean) : undefined;
const summaryOnly = qp.summary_only === 'true';
if (!params.id) {
const req: ListExpensesParams = { limit: 50, expand: ['merchant','budget'], expense_type: [ExpenseType.CARD] };
const resp = await brex.getCardExpenses(req);
const limited = limitExpensesPayload(resp.items as any, { summaryOnly, fields, hardTokenLimit: 24000 });
return { contents: [{ uri, mimeType: "application/json", text: JSON.stringify(limited.items, null, 2) }] } as any;
} else {
const exp = await brex.getCardExpense(params.id, { expand: ['merchant','budget','location','department','receipts.download_uris'], load_custom_fields: true });
const limited = limitExpensesPayload([exp] as any, { summaryOnly, fields, hardTokenLimit: 24000 });
return { contents: [{ uri, mimeType: "application/json", text: JSON.stringify(limited.items[0] || {}, null, 2) }] } as any;
}
}
// Fallback: instruct client to use tools for other URIs
return {
contents: [{
uri,
mimeType: "application/json",
text: JSON.stringify({ error: "Unsupported resource URI in router", guidance: "Use tools or supported resources: brex://expenses, brex://expenses/card, brex://docs/usage" }, null, 2)
}]
} as any;
});
}
