implement CalDAV MCP server v1 with streamable HTTP tools

tests/errors.test.ts

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+import { describe, expect, it } from "vitest";
+import { ErrorCode } from "@modelcontextprotocol/sdk/types.js";
+import { CaldavHttpError, mapErrorToMcp } from "../src/errors.js";
+
+describe("mapErrorToMcp", () => {
+  it("maps 412 to invalid request conflict", () => {
+    const error = mapErrorToMcp(new CaldavHttpError(412, "PUT", "https://example.com", ""));
+    expect(error.code).toBe(ErrorCode.InvalidRequest);
+    expect(error.message.toLowerCase()).toContain("conflict");
+  });
+
+  it("maps 5xx to internal error", () => {
+    const error = mapErrorToMcp(new CaldavHttpError(503, "PROPFIND", "https://example.com", ""));
+    expect(error.code).toBe(ErrorCode.InternalError);
+  });
+});

tests/ics.test.ts

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+import { describe, expect, it } from "vitest";
+import { ensureUid, validateIcsEvent } from "../src/ics.js";
+import { ValidationError } from "../src/errors.js";
+
+describe("ics helpers", () => {
+  it("adds UID when missing", () => {
+    const ics = `BEGIN:VCALENDAR\nBEGIN:VEVENT\nDTSTART:20260101T100000Z\nDTEND:20260101T110000Z\nEND:VEVENT\nEND:VCALENDAR`;
+    const output = ensureUid(ics);
+    expect(output.uid).toBeTruthy();
+    expect(output.ics).toContain(`UID:${output.uid}`);
+  });
+
+  it("rejects DTEND before DTSTART", () => {
+    const ics = `BEGIN:VCALENDAR\nBEGIN:VEVENT\nUID:abc\nDTSTART:20260102T100000Z\nDTEND:20260101T100000Z\nEND:VEVENT\nEND:VCALENDAR`;
+    expect(() => validateIcsEvent(ics)).toThrow(ValidationError);
+  });
+});

tests/util.test.ts

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+import { describe, expect, it } from "vitest";
+import { normalizeHref } from "../src/util.js";
+
+describe("normalizeHref", () => {
+  it("resolves relative href against base", () => {
+    const href = normalizeHref("/caldav/user/Calendar/personal/", "https://caldav.example.com/caldav");
+    expect(href).toBe("https://caldav.example.com/caldav/user/Calendar/personal/");
+  });
+
+  it("strips URL fragment", () => {
+    const href = normalizeHref("https://caldav.example.com/caldav/user/Calendar/personal/#fragment", "https://caldav.example.com/caldav");
+    expect(href).toBe("https://caldav.example.com/caldav/user/Calendar/personal/");
+  });
+});

tests/xml.test.ts

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+import { describe, expect, it } from "vitest";
+import { parseMultiStatus } from "../src/caldav/xml.js";
+
+describe("parseMultiStatus", () => {
+  it("parses href and props from multistatus response", () => {
+    const xml = `<?xml version="1.0" encoding="UTF-8"?>
+<d:multistatus xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
+  <d:response>
+    <d:href>/SOGo/dav/user/Calendar/personal/</d:href>
+    <d:propstat>
+      <d:prop>
+        <d:displayname>Personal</d:displayname>
+      </d:prop>
+      <d:status>HTTP/1.1 200 OK</d:status>
+    </d:propstat>
+  </d:response>
+</d:multistatus>`;
+
+    const parsed = parseMultiStatus(xml);
+    expect(parsed).toHaveLength(1);
+    expect(parsed[0].href).toBe("/SOGo/dav/user/Calendar/personal/");
+    expect(parsed[0].statuses[0].status).toBe(200);
+    expect(parsed[0].statuses[0].props.displayname).toBe("Personal");
+  });
+});