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// SPDX-License-Identifier: Apache-2.0
/**
* @module MCP/EPOpenDataClient
* @description Direct HTTP fallback client for the European Parliament Open Data
* Portal (`https://data.europarl.europa.eu/api/v2/`) — specifically the
* `/decision` endpoint that exposes roll-call voting records.
*
* ## Why this exists (Defect D-02)
*
* The EP MCP server tool `get_voting_records` relies on an EP feed that
* publishes roll-call data with a 4–6 week delay (documented limitation,
* see `.github/prompts/07-mcp-reference.md` §11 item #6). That lag can
* leave the most recent voting window empty in MCP even when the EP Open
* Data Portal `/api/v2/decision` endpoint already exposes the underlying
* roll-call records directly. This client therefore queries that endpoint
* whenever the MCP layer returns an empty votes array, improving freshness
* without limiting the fallback to older date ranges.
*
* ## Three-state fallback logic
*
* Call {@link getVotingRecordsWithFallback} to execute the decision tree:
*
* ```
* (a) MCP returns non-empty votes → use MCP result (source: "mcp")
* (b) MCP empty, Portal has data → use Portal result (source: "ep-open-data-portal")
* (c) Both empty → emit 🔴 unavailable marker (source: "unavailable")
* ```
*
* ## Transport
*
* - Uses the native Node 25 `fetch()` — no extra runtime dependency.
* - Every call has an independent `AbortController` with a configurable
* timeout (`EP_OPEN_DATA_TIMEOUT_MS`, default 30 s).
* - Errors (HTTP 4xx/5xx, network faults, JSON parse failures, abort) are
* caught and converted to an empty-votes envelope matching the MCP fallback
* shape, so consumers that already expect `response.content[0]?.text` to
* hold a JSON blob keep working without change.
*
* ## Attribution
*
* All data returned by this client originates from the EP Open Data Portal
* which is published under the CC BY 4.0 licence. Every fallback response
* includes a `_attribution` field with the canonical citation string.
*
* Environment variables:
* - `EP_OPEN_DATA_BASE_URL` — override base URL (default
* `https://data.europarl.europa.eu/api/v2`).
* - `EP_OPEN_DATA_TIMEOUT_MS` — per-request timeout (default `30000`).
*/
import type { MCPToolResult, MCPClientOptions } from '../types/index.js';
// ─── Defaults ────────────────────────────────────────────────────────────────
/** Default base URL for the EP Open Data Portal API v2. */
const DEFAULT_EP_OPEN_DATA_BASE_URL = 'https://data.europarl.europa.eu/api/v2';
/** Default per-request timeout (milliseconds). */
const DEFAULT_EP_OPEN_DATA_TIMEOUT_MS = 30_000;
/**
* Attribution string required by the EP Open Data Portal licence (CC BY 4.0).
* Appended to every fallback response.
*/
const EP_OPEN_DATA_ATTRIBUTION =
'European Parliament Open Data Portal — https://data.europarl.europa.eu — CC BY 4.0';
/**
* Generic empty-votes fallback payload returned when the portal call cannot
* produce usable voting data, including invalid input, missing dates, empty
* portal responses, and HTTP/network/parse/timeout failures.
*/
const EMPTY_VOTES_FALLBACK: MCPToolResult = {
content: [{ type: 'text', text: '{"votes":[]}' }],
};
// ─── Virtual tool list ────────────────────────────────────────────────────────
/** Canonical tool name for EP voting records (kept DRY for tools list and warnings). */
const EP_GET_VOTING_RECORDS_TOOL = 'ep-get-voting-records';
/**
* Virtual tool names exposed by this client. The list is used as a drift
* guard in `test/unit/ep-open-data-client.test.js` and in the Stage-C
* editorial fingerprint for `voting-patterns.md` (the article must cite
* at least one of these when the fallback is active).
*/
export const EP_OPEN_DATA_TOOLS: readonly string[] = [EP_GET_VOTING_RECORDS_TOOL];
// ─── Response types (EP Open Data Portal JSON-LD narrow subset) ──────────────
interface EPDecisionRecord {
identifier?: string;
date?: string;
activityType?: string;
prefLabel?: string | Record<string, string>;
favorable?: number;
against?: number;
abstention?: number;
/** Raw @id URI (used when `identifier` is absent). */
'@id'?: string;
}
interface EPDecisionResponse {
data?: EPDecisionRecord[];
}
// ─── Public types ─────────────────────────────────────────────────────────────
/**
* Source tag for a voting-records result.
* - `"mcp"` — the EP MCP server returned non-empty data.
* - `"ep-open-data-portal"` — MCP was empty; the fallback portal query succeeded.
* - `"unavailable"` — both sources returned empty; a `🔴` marker was emitted.
*/
export type VotingDataSource = 'mcp' | 'ep-open-data-portal' | 'unavailable';
/**
* Result envelope from {@link getVotingRecordsWithFallback}.
* Exposes the raw MCP-shaped result plus provenance metadata consumed
* by `voting-patterns.md` §"Voting Data Freshness".
*/
export interface VotingRecordsFallbackResult {
/** MCP-shaped voting records (or 🔴 marker when unavailable). */
result: MCPToolResult;
/** Which source delivered the data. */
source: VotingDataSource;
/**
* Human-readable freshness string for the `voting-data-freshness` audit row.
* E.g. `"🟢 MCP (2026-04-01 → 2026-04-26)"`,
* `"🟡 EP Open Data Portal fallback (2026-03-01 → 2026-04-01)"`, or
* `"🔴 voting data unavailable for window 2026-04-01 → 2026-04-26"`.
*/
freshnessLabel: string;
}
/**
* Options for {@link getVotingRecordsWithFallback} and
* {@link EPOpenDataClient.getVotingRecords}.
*/
export interface VotingRecordsFallbackOptions extends MCPClientOptions {
/** Inclusive start date (YYYY-MM-DD). */
dateFrom: string;
/** Inclusive end date (YYYY-MM-DD). */
dateTo: string;
/** Maximum records to return (default 50). */
limit?: number;
/** Pagination offset (default 0). */
offset?: number;
/** Optional `fetch` implementation injection for testing. */
fetchImpl?: typeof fetch;
/** Override the EP Open Data base URL. */
apiBaseUrl?: string;
/** Per-request timeout in milliseconds. */
timeoutMs?: number;
}
// ─── Utilities ────────────────────────────────────────────────────────────────
/**
* Unwrap a multilingual JSON-LD label to a plain string.
* Prefers the English value; falls back to the first available string value.
*
* @param raw - Raw label (string, locale object, or undefined).
* @returns Plain string (empty when no label is available).
* @internal
*/
function unwrapLabel(raw: string | Record<string, string> | undefined): string {
if (!raw) return '';
Iif (typeof raw === 'string') return raw;
Eif (typeof raw['en'] === 'string') return raw['en'];
for (const v of Object.values(raw)) {
if (typeof v === 'string') return v;
}
return '';
}
/**
* Wrap a value in the canonical MCP tool-result shape.
*
* @param payload - Serialisable payload.
* @returns MCP tool-result envelope.
* @internal
*/
function wrapAsMCPResult(payload: unknown): MCPToolResult {
const text = typeof payload === 'string' ? payload : JSON.stringify(payload ?? null);
return { content: [{ type: 'text', text }] };
}
/**
* Extract an identifier from an EP decision record.
*
* @param record - Raw EP Open Data Portal decision record.
* @returns Best-effort identifier string.
* @internal
*/
function extractIdentifier(record: EPDecisionRecord): string {
if (record.identifier) return record.identifier;
const rawId = record['@id'] ?? '';
Iif (!rawId) return '';
// Strip the URI prefix — last path segment is the local id.
const lastSlash = rawId.lastIndexOf('/');
return lastSlash >= 0 ? rawId.slice(lastSlash + 1) : rawId;
}
// ─── Client ──────────────────────────────────────────────────────────────────
/**
* Direct HTTP client for EP Open Data Portal roll-call vote data.
*
* Queries `GET /api/v2/decision` with `date-of-vote-start` and
* `date-of-vote-end` parameters. The response is JSON-LD; we extract
* the `data` array and normalise each entry to the same `votes[]` shape
* that the MCP `get_voting_records` tool returns, augmented with
* `_source` and `_attribution` metadata.
*
* @example
* ```ts
* const client = new EPOpenDataClient();
* const result = await client.getVotingRecords({
* dateFrom: '2026-03-01',
* dateTo: '2026-04-01',
* });
* ```
*/
export class EPOpenDataClient {
private readonly _apiBaseUrl: string;
private readonly _timeoutMs: number;
private readonly _fetchImpl: typeof fetch;
private _connected = false;
constructor(options: VotingRecordsFallbackOptions = { dateFrom: '', dateTo: '' }) {
const envBase = process.env['EP_OPEN_DATA_BASE_URL'];
const envTimeout = process.env['EP_OPEN_DATA_TIMEOUT_MS'];
const parsedEnvTimeout =
envTimeout !== undefined && envTimeout !== '' ? Number.parseInt(envTimeout, 10) : Number.NaN;
const base =
options.apiBaseUrl ?? (envBase && envBase !== '' ? envBase : DEFAULT_EP_OPEN_DATA_BASE_URL);
// Strip trailing slashes without a regex (avoids polynomial-ReDoS flags).
let end = base.length;
while (end > 0 && base.charCodeAt(end - 1) === 47 /* '/' */) {
end -= 1;
}
this._apiBaseUrl = end === base.length ? base : base.slice(0, end);
this._timeoutMs =
options.timeoutMs !== undefined && Number.isFinite(options.timeoutMs) && options.timeoutMs > 0
? options.timeoutMs
: Number.isFinite(parsedEnvTimeout) && parsedEnvTimeout > 0
? parsedEnvTimeout
: DEFAULT_EP_OPEN_DATA_TIMEOUT_MS;
this._fetchImpl = options.fetchImpl ?? globalThis.fetch.bind(globalThis);
}
/**
* Base URL currently in use (set at construction time).
*
* @returns The fully-qualified EP Open Data Portal base URL (no trailing slash).
*/
getApiBaseUrl(): string {
return this._apiBaseUrl;
}
/**
* Per-request timeout in milliseconds.
*
* @returns The timeout applied to every `fetch()` call.
*/
getTimeoutMs(): number {
return this._timeoutMs;
}
/**
* Mark the client as ready (HTTP is stateless; validates URL shape only).
*
* @returns A resolved promise; never throws for valid URLs.
* @throws When the base URL is malformed (e.g. missing protocol).
*/
async connect(): Promise<void> {
try {
new URL(this._apiBaseUrl);
this._connected = true;
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
throw new Error(`Invalid EP_OPEN_DATA_BASE_URL "${this._apiBaseUrl}": ${message}`, {
cause: error,
});
}
}
/**
* Whether {@link connect} has been called successfully.
*
* @returns `true` after a successful {@link connect}.
*/
isConnected(): boolean {
return this._connected;
}
/** Reset the connected flag. No real socket to close. */
disconnect(): void {
this._connected = false;
}
/**
* Fetch roll-call voting records from the EP Open Data Portal.
*
* Virtual tool: `ep-get-voting-records` (see {@link EP_GET_VOTING_RECORDS_TOOL}).
*
* Queries `/decision?date-of-vote-start=<dateFrom>&date-of-vote-end=<dateTo>`
* and normalises the JSON-LD response to a `{ votes: VoteEntry[] }`
* envelope whose shape mirrors `get_voting_records` from the EP MCP server,
* augmented with `_source` and `_attribution` metadata.
*
* Returns the EMPTY_VOTES_FALLBACK envelope on any error so callers can
* safely chain the result through {@link EPOpenDataClient.isVotingDataEmpty}
* without defensive try/catch.
*
* @param options - Query options. `dateFrom` and `dateTo` are required and
* must be non-empty YYYY-MM-DD strings.
* @returns MCP-shaped result with `votes[]` array (possibly empty on error).
*/
async getVotingRecords(
options: Pick<VotingRecordsFallbackOptions, 'dateFrom' | 'dateTo' | 'limit' | 'offset'>
): Promise<MCPToolResult> {
const { dateFrom, dateTo } = options;
if (!dateFrom || !dateTo) {
console.warn(`${EP_GET_VOTING_RECORDS_TOOL}: dateFrom and dateTo are required`);
return EMPTY_VOTES_FALLBACK;
}
try {
const qs = new URLSearchParams({
'date-of-vote-start': dateFrom,
'date-of-vote-end': dateTo,
limit: String(options.limit ?? 50),
offset: String(options.offset ?? 0),
format: 'application/ld+json',
});
const json = await this._getJSON<EPDecisionResponse>(`/decision?${qs.toString()}`);
const records = json?.data ?? [];
const votes = records.map((r) => ({
identifier: extractIdentifier(r),
date: r.date ?? '',
title: unwrapLabel(r.prefLabel),
activityType: r.activityType ?? '',
for: r.favorable ?? 0,
against: r.against ?? 0,
abstain: r.abstention ?? 0,
}));
return wrapAsMCPResult({
votes,
_source: 'ep-open-data-portal',
_attribution: EP_OPEN_DATA_ATTRIBUTION,
});
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn(`${EP_GET_VOTING_RECORDS_TOOL} not available:`, message);
return EMPTY_VOTES_FALLBACK;
}
}
// ─── Static helpers ──────────────────────────────────────────────────────
/**
* Return `true` when a `get_voting_records` (or fallback) result carries
* zero votes. Used to decide whether to proceed to the next fallback tier.
*
* Handles both the `{"votes":[]}` MCP empty shape and the plain
* `{"votes":null}` edge case.
*
* @param result - MCP tool result to inspect.
* @returns `true` when the votes array is absent or empty.
*/
static isVotingDataEmpty(result: MCPToolResult): boolean {
try {
const text = result.content?.[0]?.text ?? '';
if (!text) return true;
const parsed = JSON.parse(text) as { votes?: unknown[] | null };
return !Array.isArray(parsed.votes) || parsed.votes.length === 0;
} catch {
return true;
}
}
/**
* Build the canonical `🔴 voting data unavailable` marker emitted when
* both MCP and the EP Open Data Portal fallback return empty.
*
* The returned payload remains a normal MCP JSON envelope containing an
* empty `votes` array plus human-readable marker metadata (`_marker`,
* `_reason`, `_unavailable`). This preserves compatibility with consumers
* that parse `response.content[0]?.text` as JSON, while still exposing a
* clear alert message for downstream display or diagnostics.
*
* @param dateFrom - Analysis period start (YYYY-MM-DD).
* @param dateTo - Analysis period end (YYYY-MM-DD).
* @returns MCP-shaped result containing the 🔴 unavailability marker.
*/
static buildVotingUnavailableMarker(dateFrom: string, dateTo: string): MCPToolResult {
return wrapAsMCPResult({
votes: [],
_unavailable: true,
_marker: `🔴 voting data unavailable for window ${dateFrom} → ${dateTo}`,
_reason:
'EP MCP server returned no roll-call votes and EP Open Data Portal returned no decisions ' +
'for the requested window. This is expected when the window lies within the 4–6 week EP ' +
'publication delay AND no older data has been published. Do not substitute with ' +
'structural-proxy cohesion scores without an explicit LOW-confidence flag per ' +
'osint-tradecraft-standards.md §3.1.',
});
}
// ─── Private transport helpers ────────────────────────────────────────────
/**
* Build a full URL and GET it as text, enforcing the client-wide timeout.
*
* @param path - Path (already URL-encoded) to append to the base URL.
* @returns Response body as a string.
* @throws When the HTTP status is not 2xx, the request times out, or
* the network layer raises.
* @internal
*/
private async _getText(path: string): Promise<string> {
const url = `${this._apiBaseUrl}${path.startsWith('/') ? path : `/${path}`}`;
const controller = new AbortController();
const timer = setTimeout(() => controller.abort(), this._timeoutMs);
try {
const response = await this._fetchImpl(url, {
method: 'GET',
headers: { Accept: 'application/ld+json, application/json;q=0.9' },
signal: controller.signal,
});
if (!response.ok) {
throw new Error(`HTTP ${response.status} ${response.statusText} for ${url}`);
}
return await response.text();
} finally {
clearTimeout(timer);
}
}
/**
* GET a URL and parse the response body as JSON.
*
* @template T - Narrow response type declared by the caller.
* @param path - Path to append to the base URL.
* @returns Parsed JSON value.
* @throws When the response is not JSON, not 2xx, or the request fails.
* @internal
*/
private async _getJSON<T>(path: string): Promise<T> {
const raw = await this._getText(path);
try {
return JSON.parse(raw) as T;
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
throw new Error(`Failed to parse EP Open Data response as JSON: ${message}`, {
cause: error,
});
}
}
}
/** Forward-looking alias (preferred for new code). */
export const EPOpenDataPortalClient = EPOpenDataClient;
// ─── Top-level three-state fallback helper ────────────────────────────────────
/**
* Execute the three-state voting-data fallback decision tree.
*
* Given an already-retrieved MCP result and fallback options (dateFrom /
* dateTo / fetchImpl / …), returns a {@link VotingRecordsFallbackResult}
* that records both the data and the provenance label consumed by the
* `voting-patterns.md` §"Voting Data Freshness" section.
*
* Decision tree:
* ```
* (a) mcpResult has votes → source: "mcp", freshness: 🟢
* (b) MCP empty, portal ok → source: "ep-open-data-portal", freshness: 🟡
* (c) both empty → source: "unavailable", freshness: 🔴
* ```
*
* @param mcpResult - Result of `get_voting_records` from the EP MCP server.
* @param options - Fallback options; `dateFrom` and `dateTo` are required
* non-empty YYYY-MM-DD strings.
* @returns Fallback result with source tag and human-readable freshness label.
* @throws When `dateFrom` or `dateTo` is missing/blank, or when the EP Open
* Data Portal base URL is malformed (configuration error — distinct from
* the 🔴 `unavailable` data-empty path).
*
* @example
* ```ts
* const mcp = await epClient.getVotingRecords({ dateFrom, dateTo, limit: 50 });
* const { result, source, freshnessLabel } = await getVotingRecordsWithFallback(mcp, {
* dateFrom, dateTo,
* });
* // Write freshnessLabel into voting-patterns.md §"Voting Data Freshness"
* ```
*/
export async function getVotingRecordsWithFallback(
mcpResult: MCPToolResult,
options: VotingRecordsFallbackOptions
): Promise<VotingRecordsFallbackResult> {
const { dateFrom, dateTo } = options;
// Fail fast on missing/blank dates so we don't emit misleading freshness
// labels like "🟢 MCP ( → )" or empty-window 🔴 markers downstream.
if (typeof dateFrom !== 'string' || dateFrom.trim() === '') {
throw new Error('getVotingRecordsWithFallback: dateFrom is required (non-empty YYYY-MM-DD)');
}
if (typeof dateTo !== 'string' || dateTo.trim() === '') {
throw new Error('getVotingRecordsWithFallback: dateTo is required (non-empty YYYY-MM-DD)');
}
// (a) MCP returned real data — use it.
if (!EPOpenDataClient.isVotingDataEmpty(mcpResult)) {
return {
result: mcpResult,
source: 'mcp',
freshnessLabel: `🟢 MCP (${dateFrom} → ${dateTo})`,
};
}
// (b) MCP was empty — try the EP Open Data Portal fallback.
const portalClient = new EPOpenDataClient(options);
// Validate base URL up front so misconfiguration surfaces as a hard error
// rather than being swallowed into the 🔴 "unavailable" path (which is
// reserved for genuine "both sources empty" outcomes).
try {
await portalClient.connect();
} catch (error) {
throw new Error(
'Invalid EP Open Data Portal configuration: unable to validate EP_OPEN_DATA_BASE_URL',
{ cause: error }
);
}
try {
const portalResult = await portalClient.getVotingRecords({
dateFrom,
dateTo,
...(options.limit !== undefined ? { limit: options.limit } : {}),
...(options.offset !== undefined ? { offset: options.offset } : {}),
});
if (!EPOpenDataClient.isVotingDataEmpty(portalResult)) {
return {
result: portalResult,
source: 'ep-open-data-portal',
freshnessLabel: `🟡 EP Open Data Portal fallback (${dateFrom} → ${dateTo}) — attribution: ${EP_OPEN_DATA_ATTRIBUTION}`,
};
}
// (c) Both empty — emit the 🔴 unavailability marker.
return {
result: EPOpenDataClient.buildVotingUnavailableMarker(dateFrom, dateTo),
source: 'unavailable',
freshnessLabel: `🔴 voting data unavailable for window ${dateFrom} → ${dateTo}`,
};
} finally {
portalClient.disconnect();
}
}
// ─── Singleton lifecycle ──────────────────────────────────────────────────────
/** Singleton instance, created lazily by {@link getEPOpenDataClient}. */
let epOpenDataClientInstance: EPOpenDataClient | null = null;
/**
* Get or create the singleton EP Open Data client, validating the base URL
* on first use. Subsequent calls return the cached instance.
*
* @param options - Client options (override env vars and defaults).
* @returns Connected singleton client.
* @throws When the base URL is malformed.
*/
export async function getEPOpenDataClient(
options: VotingRecordsFallbackOptions = { dateFrom: '', dateTo: '' }
): Promise<EPOpenDataClient> {
if (!epOpenDataClientInstance) {
const client = new EPOpenDataClient(options);
try {
await client.connect();
epOpenDataClientInstance = client;
} catch (error) {
epOpenDataClientInstance = null;
throw error;
}
}
return epOpenDataClientInstance;
}
/** Close and clear the singleton instance (idempotent). */
export async function closeEPOpenDataClient(): Promise<void> {
if (epOpenDataClientInstance) {
epOpenDataClientInstance.disconnect();
epOpenDataClientInstance = null;
}
}
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