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* @fileoverview DOCEO client for fetching EP plenary vote XML documents
*
* Fetches and parses XML documents from the European Parliament's DOCEO system
* which provides roll-call votes (RCV) and vote results (VOT) for plenary sessions.
*
* Source: https://www.europarl.europa.eu/plenary/en/votes.html
*
* @module clients/ep/doceoClient
* @security SSRF prevention via URL validation, input sanitization
*/
import { fetch } from 'undici';
import { auditLogger, toErrorMessage } from '../../utils/auditLogger.js';
import { USER_AGENT } from '../../config.js';
import {
parseRcvXml,
parseVotXml,
rcvToLatestVotes,
votToLatestVotes,
buildDoceoUrl,
getPlenaryWeekDates,
CURRENT_PARLIAMENTARY_TERM,
type LatestVoteRecord,
type RcvVoteResult,
type VotVoteResult,
} from './doceoXmlParser.js';
/** Timeout for DOCEO XML fetches (30 seconds) */
const DOCEO_TIMEOUT_MS = 30_000;
/** Maximum response size for XML documents (5 MiB) */
const MAX_XML_RESPONSE_BYTES = 5_242_880;
interface LinkedAbortController {
controller: AbortController;
cleanup: () => void;
}
function clearFetchTimeout(timeout: ReturnType<typeof setTimeout> | undefined): void {
Eif (timeout !== undefined) {
clearTimeout(timeout);
}
}
function createLinkedAbortController(externalSignal?: AbortSignal): LinkedAbortController {
const controller = new AbortController();
if (externalSignal === undefined) {
return { controller, cleanup: () => undefined };
}
Eif (externalSignal.aborted) {
controller.abort();
return { controller, cleanup: () => undefined };
}
const abort = (): void => { controller.abort(); };
externalSignal.addEventListener('abort', abort, { once: true });
return {
controller,
cleanup: (): void => { externalSignal.removeEventListener('abort', abort); },
};
}
function isBodyTooLarge(text: string): boolean {
if (text.length > MAX_XML_RESPONSE_BYTES) return true;
if (text.length * 4 <= MAX_XML_RESPONSE_BYTES) return false;
return Buffer.byteLength(text, 'utf8') > MAX_XML_RESPONSE_BYTES;
}
/**
* Validate and extract pagination parameters, throwing a RangeError on invalid input.
*/
function validatePagination(params: GetLatestVotesParams): { limit: number; offset: number } {
const limit = params.limit ?? 50;
const offset = params.offset ?? 0;
if (limit < 1 || limit > 100) {
throw new RangeError(`limit must be between 1 and 100, got ${String(limit)}`);
}
if (offset < 0) {
throw new RangeError(`offset must be >= 0, got ${String(offset)}`);
}
return { limit, offset };
}
function buildAuditParams(params: GetLatestVotesParams): Record<string, unknown> {
const { abortSignal: _abortSignal, ...auditParams } = params;
return auditParams;
}
/**
* Parameters for fetching latest votes from DOCEO.
*/
export interface GetLatestVotesParams {
/** Specific date (YYYY-MM-DD) to fetch votes for */
date?: string | undefined;
/** Start of plenary week (Monday, YYYY-MM-DD). If omitted, uses most recent Monday. */
weekStart?: string | undefined;
/** Parliamentary term number (defaults to 10) */
term?: number | undefined;
/** Whether to include individual MEP vote positions from RCV data */
includeIndividualVotes?: boolean | undefined;
/** Maximum number of vote records to return */
limit?: number | undefined;
/** Pagination offset */
offset?: number | undefined;
/** Optional cancellation signal for bounded internal enrichment calls */
abortSignal?: AbortSignal | undefined;
}
/**
* Response structure for latest votes.
*/
export interface LatestVotesResponse {
/** Vote records */
data: LatestVoteRecord[];
/** Total count of available records */
total: number;
/** Dates that were successfully fetched */
datesAvailable: string[];
/** Dates that returned errors (document not yet published) */
datesUnavailable: string[];
/** Data source metadata */
source: {
type: 'DOCEO_XML';
term: number;
urls: string[];
};
/** Pagination */
limit: number;
offset: number;
hasMore: boolean;
}
/**
* Client for fetching plenary vote data from the EP DOCEO XML endpoint.
*
* This provides more recent vote data than the EP Open Data API, which has
* a delay of several weeks for publishing roll-call vote results.
*
* @security
* - URL construction is validated (HTTPS only, known host)
* - XML parsing uses regex-based extraction (no eval/dynamic code execution)
* - Response size limited to prevent memory exhaustion
* - All access is audit-logged
*/
export class DoceoClient {
private readonly term: number;
constructor(term: number = CURRENT_PARLIAMENTARY_TERM) {
this.term = term;
}
/**
* Fetch a single XML document from DOCEO.
*
* @param url - Full URL to the XML document
* @returns Raw XML string, or null if document not available
*/
private async fetchXml(url: string, abortSignal?: AbortSignal): Promise<string | null> {
let timeout: ReturnType<typeof setTimeout> | undefined;
const linkedAbort = createLinkedAbortController(abortSignal);
try {
timeout = setTimeout(() => { linkedAbort.controller.abort(); }, DOCEO_TIMEOUT_MS);
const response = await fetch(url, {
headers: {
'Accept': 'application/xml, text/xml',
'User-Agent': USER_AGENT,
},
signal: linkedAbort.controller.signal,
});
if (!response.ok) {
if (response.status === 404) {
await response.body?.cancel();
return null;
}
await response.body?.cancel();
auditLogger.logError('doceo_fetch', { url }, `HTTP ${String(response.status)}`);
return null;
}
const contentLength = response.headers.get('content-length');
if (contentLength !== null && parseInt(contentLength, 10) > MAX_XML_RESPONSE_BYTES) {
await response.body?.cancel();
auditLogger.logError('doceo_fetch', { url }, 'Response too large');
return null;
}
const text = await response.text();
if (isBodyTooLarge(text)) {
auditLogger.logError('doceo_fetch', { url }, 'Response body too large');
return null;
}
return text;
} catch (error: unknown) {
auditLogger.logError('doceo_fetch', { url }, toErrorMessage(error));
return null;
} finally {
clearFetchTimeout(timeout);
linkedAbort.cleanup();
}
}
/**
* Fetch roll-call vote data for a specific date.
*
* @param date - Date in YYYY-MM-DD format
* @returns Parsed RCV results, or empty array if unavailable
*/
async fetchRcvForDate(
date: string,
term = this.term,
abortSignal?: AbortSignal
): Promise<RcvVoteResult[]> {
const url = buildDoceoUrl(date, 'RCV', term);
const xml = await this.fetchXml(url, abortSignal);
if (xml === null) return [];
return parseRcvXml(xml);
}
/**
* Fetch aggregate vote results for a specific date.
*
* @param date - Date in YYYY-MM-DD format
* @returns Parsed VOT results, or empty array if unavailable
*/
async fetchVotForDate(
date: string,
term = this.term,
abortSignal?: AbortSignal
): Promise<VotVoteResult[]> {
const url = buildDoceoUrl(date, 'VOT', term);
const xml = await this.fetchXml(url, abortSignal);
if (xml === null) return [];
return parseVotXml(xml);
}
/**
* Fetch votes for a single date, trying RCV first then VOT.
* @private
*/
private async fetchVotesForDate(
date: string,
term: number,
includeIndividual: boolean,
abortSignal?: AbortSignal
): Promise<{ votes: LatestVoteRecord[]; url: string } | null> {
const rcvUrl = buildDoceoUrl(date, 'RCV', term);
const rcvResults = await this.fetchRcvForDate(date, term, abortSignal);
if (rcvResults.length > 0) {
let records = rcvToLatestVotes(rcvResults, date, term, rcvUrl);
if (!includeIndividual) {
records = records.map(({ mepVotes: _, ...rest }) => rest);
}
return { votes: records, url: rcvUrl };
}
const votUrl = buildDoceoUrl(date, 'VOT', term);
const votResults = await this.fetchVotForDate(date, term, abortSignal);
if (votResults.length > 0) {
const records = votToLatestVotes(votResults, date, term, votUrl);
return { votes: records, url: votUrl };
}
return null;
}
/**
* Determine which dates to query based on params.
* @private
*/
private resolveDates(params: GetLatestVotesParams): string[] {
if (params.date !== undefined && params.date !== '') {
return [params.date];
}
return getPlenaryWeekDates(params.weekStart);
}
/**
* Get the latest votes from DOCEO XML sources.
*
* Attempts to fetch both RCV (individual MEP votes) and VOT (aggregate results)
* for each day in the plenary week. RCV data is preferred as it includes
* individual MEP positions and political group breakdowns.
*
* @param params - Query parameters
* @returns Latest votes response with available data
*
* @security Audit-logged per GDPR Article 30
*/
async getLatestVotes(params: GetLatestVotesParams = {}): Promise<LatestVotesResponse> {
const action = 'get_latest_votes';
const term = params.term ?? this.term;
const { limit, offset } = validatePagination(params);
const includeIndividual = params.includeIndividualVotes ?? true;
const dates = this.resolveDates(params);
try {
const allVotes: LatestVoteRecord[] = [];
const datesAvailable: string[] = [];
const datesUnavailable: string[] = [];
const urls: string[] = [];
for (const date of dates) {
const result = await this.fetchVotesForDate(date, term, includeIndividual, params.abortSignal);
if (result !== null) {
allVotes.push(...result.votes);
datesAvailable.push(date);
urls.push(result.url);
} else {
datesUnavailable.push(date);
}
}
const total = allVotes.length;
const paginatedVotes = allVotes.slice(offset, offset + limit);
const response: LatestVotesResponse = {
data: paginatedVotes,
total,
datesAvailable,
datesUnavailable,
source: { type: 'DOCEO_XML', term, urls },
limit,
offset,
hasMore: offset + paginatedVotes.length < total,
};
auditLogger.logDataAccess(action, buildAuditParams(params), response.data.length);
return response;
} catch (error: unknown) {
auditLogger.logError(action, buildAuditParams(params), toErrorMessage(error));
throw error;
}
}
}
/** Singleton DOCEO client instance */
export const doceoClient = new DoceoClient();
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