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lib/impressum.js

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  1. // LEASH wallet-control — Impressum (legal notice) parser, importable library form.
  2. //
  3. // Ported verbatim (parsing logic unchanged) from the viseca-shopper agent repo's
  4. // scripts/impressum-check.js (2026-09-24/25, live-verified against the fixture
  5. // shops denner.ch / trisa.ch / ochsnersport.ch / post.ch). The CLI script stays
  6. // the authority for manual checks; this module lets the wallet-control dossier
  7. // service call the same parser in-process.
  8. //
  9. // Guarantees carried over:
  10. // - A registry number/UID appears only when the page actually prints one —
  11. // "not stated" is reported, never guessed.
  12. // - Address regexes are line-anchored; content is scored before a page counts
  13. // as an impressum.
  15. const LEGAL_FORM = /\b(AG|GmbH|Sàrl|SARL|Sagl|SA|LLC|Ltd\.?|KG|OHG|GdbR|e\.K\.|e\.U\.|in Liquidation)\b/;
  16. const UID_RE = /CHE\s*-?\s*\d{3}\s*[.\s]?\d{3}\s*[.\s]?\d{3}/;
  17. const VAT_LABEL_RE = /(UID|MwSt(?:-|\s*)?(?:Nr\.?|nummer)?|MWST|USt(?:-IdNr\.?)?|VAT(?:\s*(?:nr|no|number|id))?)\s*[:.]?\s*([A-Z]{1,3}\s?[\d.\-]{8,15})/i;
  18. const HR_ID_RE = /CH-\d{3}\.\d\.\d{3}\.\d{3}-\d/;
  19. const REG_LABEL_RE = /(Handelsregister(?:-|\s*)?(?:Nr\.?|nummer)?|Registergericht|Register-Nr\.?|Registernummer|HR-Nummer|HR-Nr\.?|HRB|registry number|registration number|company number|commercial register)\s*[:#No.]*\s*([A-Z0-9][A-Z0-9.\-\/]{3,24})/i;
  20. const COUNTRY_RE = /\b(Schweiz|Suisse|Svizzera|Switzerland|Deutschland|Germany|Österreich|Austria|Liechtenstein|France|Italia|Italy)\b/gi;
  22. const STREET_LINE_RE = /^(?:[A-ZÄÖÜÀ-Þ][\p{L}'’.\-]*\s+)?[\p{L}'’.\-]*(?:strasse|straße|str\.|weg|gasse|platz|allee|damm|ring|graben|ufer|quai|rue|avenue|via|viale|lane|road|street|park|markt)[\s.]*(\d{1,4}\s?[a-zA-Z]?)$/iu;
  23. const PLZ_LINE_RE = /^(CH-)?(\d{4,5})\s+([A-ZÄÖÜÀ-Þ][\p{L}'’.\-]*(?:\s+[A-ZÄÖÜÀ-Þ][\p{L}'’.\-]+){0,2})$/u;
  25. const COMMON_PATHS = [
  26. '/impressum', '/de/impressum', '/impressum/', '/imprint', '/en/impressum',
  27. '/legal', '/legal-notice', '/fr/impressum', '/legalnotice', '/impressum.html',
  28. '/company/impressum', '/about/impressum', '/kontakt/impressum', '/service/impressum',
  29. '/footer/impressum', '/de/imprint', '/shop/impressum',
  30. ];
  32. const ENTITIES = { amp: '&', lt: '<', gt: '>', quot: '"', apos: "'", nbsp: ' ', auml: 'ä', ouml: 'ö', uuml: 'ü', Auml: 'Ä', Ouml: 'Ö', Uuml: 'Ü', szlig: 'ß', agrave: 'à', eacute: 'é', egrave: 'è', euml: 'ë', ccedil: 'ç' };
  33. const COUNTRY_WORDS = new Set(['Schweiz', 'Suisse', 'Svizzera', 'Switzerland', 'Deutschland', 'Germany', 'Österreich', 'Austria', 'Liechtenstein', 'France', 'Italia', 'Italy', 'CH']);
  35. export function htmlToText(html) {
  36. return html
  37. .replace(/<!--[\s\S]*?-->/g, ' ')
  38. .replace(/<(script|style|noscript|svg|head)[\s\S]*?<\/\1\s*>/gi, ' ')
  39. .replace(/<(br|\/p|\/div|\/li|\/h[1-6]|\/tr|\/td|\/th|\/section|\/footer)[^>]*>/gi, '\n')
  40. .replace(/<[^>]+>/g, ' ')
  41. .replace(/&#(\d+);/g, (_, n) => String.fromCodePoint(Number(n)))
  42. .replace(/&#x([0-9a-f]+);/gi, (_, n) => String.fromCodePoint(parseInt(n, 16)))
  43. .replace(/&([a-zA-Z]+);/g, (m, name) => ENTITIES[name] !== undefined ? ENTITIES[name] : m)
  44. .split('\n').map((l) => l.replace(/\s+/g, ' ').trim()).filter(Boolean).join('\n');
  45. }
  47. export async function fetchText(url, timeoutMs) {
  48. const res = await fetch(url, {
  49. redirect: 'follow',
  50. signal: AbortSignal.timeout(timeoutMs),
  51. headers: {
  52. 'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36',
  53. 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  54. 'Accept-Language': 'de-CH,de;q=0.9,fr-CH;q=0.8,en;q=0.7',
  55. },
  56. });
  57. if (!res.ok) throw new Error(`HTTP ${res.status}`);
  58. const type = res.headers.get('content-type') || '';
  59. if (type && !/text\/html|text\/plain|application\/xhtml/i.test(type)) throw new Error(`not HTML: ${type}`);
  60. const buf = Buffer.from(await res.arrayBuffer());
  61. return { text: buf.subarray(0, 2 * 1024 * 1024).toString('utf8'), finalUrl: res.url };
  62. }
  64. export function normalizeInput(raw) {
  65. let s = raw.trim();
  66. if (!/^https?:\/\//i.test(s)) s = 'https://' + s;
  67. return new URL(s);
  68. }
  70. /** Find impressum candidates: homepage anchors first, then common paths. */
  71. export function findCandidates(baseUrl, homeHtml) {
  72. const found = [];
  73. const push = (url, score) => {
  74. try {
  75. const u = new URL(url, baseUrl);
  76. u.hash = '';
  77. if (!/^https?:$/.test(u.protocol)) return;
  78. const key = u.origin + u.pathname.replace(/\/+$/, '');
  79. const existing = found.find((c) => c.key === key);
  80. if (existing) existing.score = Math.max(existing.score, score);
  81. else found.push({ key, url: u.toString(), score });
  82. } catch { /* ignore malformed hrefs */ }
  83. };
  84. const anchorRe = /<a\b[^>]*href\s*=\s*["']([^"']+)["'][^>]*>([\s\S]*?)<\/a\s*>/gi;
  85. let m;
  86. while ((m = anchorRe.exec(homeHtml)) !== null) {
  87. const href = m[1];
  88. const label = htmlToText(m[2]).toLowerCase();
  89. let score = 0;
  90. if (/impressum/.test(href) || /impressum/.test(label)) score = 5;
  91. else if (/imprint/.test(href) || /imprint/.test(label)) score = 5;
  92. else if (/legal[-_ ]?notice|anbieterkennzeichnung|provider identification|mentiones legales/.test(href) || /legal[-_ ]?notice|anbieterkennzeichnung/.test(label)) score = 4;
  93. else if (/(^|\/|[-_.])legal((\/)|([-_.]?info)|$)/.test(href.toLowerCase()) || /^legal$/.test(label)) score = 2;
  94. if (score) push(href, score);
  95. }
  96. for (const p of COMMON_PATHS) push(new URL(p, baseUrl).toString(), 1);
  97. found.sort((a, b) => b.score - a.score);
  98. return found;
  99. }
  101. /** Score how impressum-like a text page is. */
  102. export function contentScore(text) {
  103. let s = 0;
  104. if (LEGAL_FORM.test(text)) s += 2;
  105. if (UID_RE.test(text)) s += 2;
  106. if (HR_ID_RE.test(text)) s += 2;
  107. if (text.split('\n').some((l) => STREET_LINE_RE.test(l))) s += 1;
  108. if (text.split('\n').some((l) => PLZ_LINE_RE.test(l))) s += 1;
  109. if (/handelsregister|commercial register/i.test(text)) s += 1;
  110. return s;
  111. }
  113. function cleanCity(raw) {
  114. let words = raw.split(/\s+/);
  115. while (words.length > 1 && COUNTRY_WORDS.has(words[words.length - 1])) words.pop();
  116. const city = words.join(' ');
  117. return /^[\p{L}'’.\- ]+$/u.test(city) ? city : null;
  118. }
  120. /** Company line: has a legal form, short, no contact/price noise. */
  121. function isCompanyLine(line) {
  122. if (line.length > 80) return false;
  123. if (!LEGAL_FORM.test(line)) return false;
  124. if (/https?:|www\.|@|Tel\.|Telefon|Fax|CHF|\d{4,}|UID|MwSt|MWST|CHE/i.test(line)) return false;
  125. return true;
  126. }
  128. /** Extract the identity block from impressum page text. */
  129. export function extract(text) {
  130. const lines = text.split('\n');
  131. const flat = lines.join('\n');
  132. const notes = [];
  134. // --- locate PLZ+city anchor lines ---
  135. const plzHits = [];
  136. for (let i = 0; i < lines.length; i++) {
  137. const m = lines[i].match(PLZ_LINE_RE);
  138. if (m) plzHits.push({ i, postal_code: m[2], rawCity: m[3] });
  139. }
  141. // --- build address blocks: street line nearest above each PLZ line ---
  142. const blocks = [];
  143. for (const hit of plzHits) {
  144. let street = null, streetDist = 99;
  145. for (let d = 1; d <= 4; d++) {
  146. const cand = lines[hit.i - d];
  147. if (!cand || cand.length > 60) continue;
  148. if (STREET_LINE_RE.test(cand)) { street = cand; streetDist = d; break; }
  149. }
  150. let company = null, companyDist = 99;
  151. for (let d = 1; d <= 8; d++) {
  152. const cand = lines[hit.i - d];
  153. if (!cand) continue;
  154. if (isCompanyLine(cand)) { company = cand.replace(/^[\s•·\-–—*>|]+/, '').trim(); companyDist = d; break; }
  155. }
  156. const city = cleanCity(hit.rawCity);
  157. if (street && city) blocks.push({ i: hit.i, street, postal_code: hit.postal_code, city, company, streetDist, companyDist });
  158. }
  159. // Rank blocks: prefer one with a company nearby, then smallest street distance.
  160. blocks.sort((a, b) => (a.company ? 0 : 1) - (b.company ? 0 : 1) || a.streetDist - b.streetDist || a.i - b.i);
  161. const block = blocks[0] || null;
  163. // --- company fallback: global best company line ---
  164. let company_name = block && block.company ? block.company : null;
  165. let legal_form = null;
  166. if (!company_name) {
  167. let best = null;
  168. for (const line of lines) {
  169. if (!isCompanyLine(line)) continue;
  170. const name = line.replace(/^[\s•·\-–—*>|]+/, '').trim();
  171. if (!best || name.length < best.length) best = name;
  172. }
  173. company_name = best || null;
  174. if (!company_name) notes.push('no line with a legal form found');
  175. }
  176. if (company_name) legal_form = (company_name.match(LEGAL_FORM) || [])[1] || null;
  178. // --- UID / VAT ---
  179. let uid = null;
  180. const um = flat.match(UID_RE);
  181. if (um) {
  182. uid = um[0].replace(/\s+/g, '');
  183. if (!/^CHE-/.test(uid)) uid = uid.replace(/^CHE/, 'CHE-');
  184. if (!/^\d{3}\.\d{3}\.\d{3}$/.test(uid.slice(4))) {
  185. const parts = uid.slice(4).match(/(\d{3})\.?(\d{3})\.?(\d{3})/);
  186. if (parts) uid = `CHE-${parts[1]}.${parts[2]}.${parts[3]}`;
  187. }
  188. }
  189. if (!uid) {
  190. const vl = flat.match(VAT_LABEL_RE);
  191. if (vl) uid = vl[2].trim();
  192. }
  194. // --- registry number (only when actually stated) ---
  195. let registry_number = null;
  196. const hr = flat.match(HR_ID_RE);
  197. if (hr) registry_number = hr[0];
  198. if (!registry_number) {
  199. const rl = flat.match(REG_LABEL_RE);
  200. if (rl) {
  201. const val = rl[2].replace(/[.,;:)\]]+$/, '');
  202. if (val.length >= 4 && !/^(Nr|nummer|no)$/i.test(val) && val !== uid) registry_number = val;
  203. }
  204. }
  206. // --- country: within the chosen block window, else anywhere ---
  207. let country = null;
  208. const countrySearch = block ? lines.slice(Math.max(0, block.i - 2), block.i + 3) : lines;
  209. for (const seg of countrySearch) {
  210. const matches = [...seg.matchAll(COUNTRY_RE)];
  211. if (matches.length) { country = matches[0][1]; break; }
  212. }
  214. // --- evidence snippet ---
  215. let evidence_snippet = null;
  216. const anchor = block ? block.i : -1;
  217. if (anchor >= 0) evidence_snippet = lines.slice(Math.max(0, anchor - 4), anchor + 3).join(' | ').slice(0, 400);
  219. const address = block ? { street: block.street, postal_code: block.postal_code, city: block.city, country } : null;
  220. return { company_name, legal_form, address, uid, registry_number, evidence_snippet, notes };
  221. }
  223. /**
  224. * Check one shop's Impressum. Same flow as the CLI script: homepage anchor
  225. * discovery, then common paths, 7-fetch budget, one retry per candidate.
  226. * Returns the JSON result object (never throws).
  227. */
  228. export async function checkImpressum(target, { timeoutMs = 9000 } = {}) {
  229. const result = {
  230. input: target || null,
  231. impressum_url: null,
  232. status: 'error',
  233. company_name: null, legal_form: null, address: null, uid: null, registry_number: null,
  234. evidence_snippet: null,
  235. notes: [],
  236. fetched_at: new Date().toISOString(),
  237. };
  238. if (!target) { result.notes.push('no input'); return result; }
  240. let base;
  241. try { base = normalizeInput(target); } catch (e) { result.notes.push('invalid URL: ' + e.message); return result; }
  243. const looksDirect = /impressum|imprint|legal/i.test(base.pathname);
  244. let candidates = [];
  245. if (looksDirect) {
  246. candidates = [{ url: base.toString(), score: 9 }];
  247. } else {
  248. try {
  249. const home = await fetchText(base.origin + '/', timeoutMs);
  250. candidates = findCandidates(base.origin + '/', home.text);
  251. } catch (e) {
  252. result.notes.push(`homepage fetch failed (${e.message}); trying common paths`);
  253. candidates = COMMON_PATHS.map((p) => ({ url: new URL(p, base.origin + '/').toString(), score: 1 }));
  254. }
  255. }
  257. let attempts = 0;
  258. let blocked = 0;
  259. for (const cand of candidates) {
  260. if (attempts >= 7) { result.notes.push('fetch budget exhausted'); break; }
  261. attempts++;
  262. for (let tryN = 0; tryN < 2; tryN++) { // one retry: shops soft-block intermittently
  263. try {
  264. const page = await fetchText(cand.url, timeoutMs);
  265. const text = htmlToText(page.text);
  266. if (contentScore(text) >= 3) {
  267. result.status = 'found';
  268. result.impressum_url = page.finalUrl;
  269. Object.assign(result, extract(text));
  270. if (!result.registry_number) result.notes.push('registry number not stated on the page');
  271. if (!result.uid) result.notes.push('no UID/VAT stated on the page');
  272. return result;
  273. }
  274. break; // fetched fine, just not impressum-like
  275. } catch (e) {
  276. if (tryN === 1) {
  277. if (e.message.startsWith('HTTP 4') || /timeout|aborted/i.test(e.message)) blocked++;
  278. result.notes.push(`fetch ${cand.url} failed: ${e.message}`);
  279. } else {
  280. await new Promise((r) => setTimeout(r, 700)); // brief backoff before retry
  281. }
  282. }
  283. }
  284. }
  285. if (result.status !== 'found') {
  286. result.status = attempts > blocked ? 'not_found' : 'blocked';
  287. result.notes.push(attempts ? `no readable impressum (${attempts} candidates tried${blocked ? `, ${blocked} blocked/timeout` : ''})` : 'no candidates to try');
  288. }
  289. return result;
  290. }