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820 lines (759 loc) · 35.1 KB
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// ============================================================
// XERJ — share-link guest page
//
// The whole guest side of `xerj share`: read the share id from the URL
// fragment, exchange it plus a passcode for a read-only key, then give the
// guest a reading room over the one index that key can reach.
//
// THREE RULES THIS FILE KEEPS — the tests grep for the first and drive a real
// browser at the other two:
//
// 1. Document text is attacker-controlled. It is other people's email. It is
// only ever put on the page as TEXT — `textContent` / `createTextNode` —
// and never parsed as markup. There is no `innerHTML`, `outerHTML`,
// `insertAdjacentHTML`, `document.write`, `eval` or `new Function` in
// this file, and an HTML email body is shown as the text it is. URLs in
// documents are not turned into links.
// 2. The share id is never part of a URL this page requests. It lives in
// the URL *fragment*, which a browser does not send to a server, and it
// goes to the node in the BODY of the claim POST (`/_share/claim`) —
// never in a path. A path is what an access log, a reverse proxy and a
// tunnel's edge write down; the first cut posted to `/_share/<id>/claim`
// and undid the fragment one request later. After a claim the id is
// removed from the address bar.
// 3. The session is ONE sessionStorage record, written exactly as
// sessionStorage['xerj.share'] =
// JSON.stringify({api_key, index, brain, expires_at, label})
// — the console's guest mode reads the same record. sessionStorage, not
// localStorage: it is scoped to this tab and gone when the tab closes.
// Beside it sits `xerj.share.link`: the share's public HANDLE (the first
// 12 hex characters of SHA-256(id), what `xerj share --list` prints). It
// cannot be turned back into the link. It is how the page knows that a
// link opened again in this tab is the one it already holds a key for.
//
// "Zero-token": search and reading. Nothing here generates text, summarises,
// or calls a model.
// ============================================================
'use strict';
(() => {
const SHARE_KEY = 'xerj.share';
const LINK_KEY = 'xerj.share.link';
const PAGE_SIZE = 10;
// Highlight delimiters. Private-use code points: they cannot be typed into a
// search box by accident and mean nothing as markup, so a snippet is split on
// them and rebuilt from text nodes. The engine's default `<em>` tags would
// arrive glued to unescaped document text — unusable without parsing HTML.
const HL_PRE = '\uE000';
const HL_POST = '\uE001';
// Fields that usually hold the readable body, best first.
const BODY_FIELDS = ['body', 'text', 'content', 'message', 'description', 'summary'];
// Fields that usually name the document, best first.
const TITLE_FIELDS = ['title', 'subject', 'email_subject', 'name', 'attachment_name', 'filename', 'file_name', 'path'];
// Shown under a hit's title, in this order, when present.
const META_FIELDS = ['email_from', 'from', 'author', 'email_date', 'date', 'attachment_name', 'ax_path', 'path', '_source_path'];
const MAX_QUERY_FIELDS = 24;
const MAX_INLINE_VALUE = 280;
const $ = (id) => document.getElementById(id);
const views = { claim: $('view-claim'), ended: $('view-ended'), room: $('view-room') };
/** In-memory only. `session` mirrors the sessionStorage record. */
const state = {
shareId: null,
session: null,
plans: [], // [{index, semanticField, fields}]
query: '',
terms: [],
from: 0,
total: 0,
shown: 0,
noneContain: false,
expiryTimer: null,
};
// ── small DOM helpers (text only) ────────────────────────────────────────
function show(name) {
for (const [key, el] of Object.entries(views)) el.hidden = key !== name;
}
function el(tag, className, text) {
const node = document.createElement(tag);
if (className) node.className = className;
if (text != null) node.textContent = String(text);
return node;
}
function clear(node) {
while (node.firstChild) node.removeChild(node.firstChild);
}
function setStatus(text, bad) {
const node = $('room-status');
node.textContent = text || '';
node.classList.toggle('bad', !!bad);
}
// ── the session record ───────────────────────────────────────────────────
function expiryMs(v) {
if (v == null || v === '') return null;
if (typeof v === 'number') return Number.isFinite(v) ? v : null;
const t = Date.parse(String(v));
return Number.isFinite(t) ? t : null;
}
function loadSession() {
let raw = null;
try { raw = sessionStorage.getItem(SHARE_KEY); } catch { return null; }
if (!raw) return null;
let obj;
try { obj = JSON.parse(raw); } catch { return null; }
if (!obj || typeof obj.api_key !== 'string' || !obj.api_key ||
typeof obj.index !== 'string' || !obj.index) return null;
const exp = expiryMs(obj.expires_at);
if (exp != null && exp <= Date.now()) return null;
return obj;
}
/** The contract, exactly: five keys, nothing else. */
function saveSession(claim) {
const record = {
api_key: claim.api_key,
index: claim.index,
brain: claim.brain == null ? null : claim.brain,
expires_at: claim.expires_at == null ? null : claim.expires_at,
label: claim.label == null ? null : claim.label,
};
sessionStorage.setItem(SHARE_KEY, JSON.stringify(record));
return record;
}
/** Stop using the session in this page, without touching what is stored. */
function leaveRoom() {
state.session = null;
state.plans = [];
if (state.expiryTimer) clearInterval(state.expiryTimer);
state.expiryTimer = null;
}
function dropSession() {
try {
sessionStorage.removeItem(SHARE_KEY);
sessionStorage.removeItem(LINK_KEY);
} catch { /* storage disabled */ }
leaveRoom();
}
// ── which share is this? ─────────────────────────────────────────────────
// SHA-256 (FIPS 180-4) of an ASCII string, as hex. It is only ever fed the
// 32-character share id. `crypto.subtle` would do the same, but it does not
// exist on a plain-http page that is not localhost — which a share on a LAN
// address is — and the same-link check has to behave the same everywhere.
// The browser test checks the result against the node's own digest.
function sha256Hex(ascii) {
const K = [
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70
8000
, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
];
const H = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];
const rotr = (x, n) => (x >>> n) | (x << (32 - n));
const bytes = [];
for (let i = 0; i < ascii.length; i += 1) bytes.push(ascii.charCodeAt(i) & 0xff);
const bits = bytes.length * 8;
bytes.push(0x80);
while (bytes.length % 64 !== 56) bytes.push(0);
// 64-bit big-endian length. The input is a 32-character id, so the high
// word is always zero.
bytes.push(0, 0, 0, 0, (bits >>> 24) & 0xff, (bits >>> 16) & 0xff, (bits >>> 8) & 0xff, bits & 0xff);
const w = new Array(64);
for (let off = 0; off < bytes.length; off += 64) {
for (let i = 0; i < 16; i += 1) {
const at = off + 4 * i;
w[i] = (bytes[at] << 24) | (bytes[at + 1] << 16) | (bytes[at + 2] << 8) | bytes[at + 3];
}
for (let i = 16; i < 64; i += 1) {
const s0 = rotr(w[i - 15], 7) ^ rotr(w[i - 15], 18) ^ (w[i - 15] >>> 3);
const s1 = rotr(w[i - 2], 17) ^ rotr(w[i - 2], 19) ^ (w[i - 2] >>> 10);
w[i] = (w[i - 16] + s0 + w[i - 7] + s1) | 0;
}
let [a, b, c, d, e, f, g, h] = H;
for (let i = 0; i < 64; i += 1) {
const t1 = (h + (rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25)) + ((e & f) ^ (~e & g)) + K[i] + w[i]) | 0;
const t2 = ((rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22)) + ((a & b) ^ (a & c) ^ (b & c))) | 0;
h = g; g = f; f = e; e = (d + t1) | 0;
d = c; c = b; b = a; a = (t1 + t2) | 0;
}
[a, b, c, d, e, f, g, h].forEach((v, i) => { H[i] = (H[i] + v) | 0; });
}
return H.map((x) => (x >>> 0).toString(16).padStart(8, '0')).join('');
}
/** The share's public handle — what the node derives from the same id. */
function handleOf(shareId) {
return sha256Hex(shareId).slice(0, 12);
}
function storedHandle() {
try { return sessionStorage.getItem(LINK_KEY); } catch { return null; }
}
function stripFragment() {
try { history.replaceState(null, '', location.pathname); } catch { /* ignore */ }
}
// ── talking to the node ──────────────────────────────────────────────────
/** Same-origin only, never cached, never with cookies, never with a Referer. */
async function call(method, path, body, withKey) {
const headers = { accept: 'application/json' };
if (body !== undefined) headers['content-type'] = 'application/json';
if (withKey && state.session) headers.authorization = `ApiKey ${state.session.api_key}`;
const resp = await fetch(path, {
method,
headers,
body: body === undefined ? undefined : JSON.stringify(body),
cache: 'no-store',
credentials: 'omit',
referrerPolicy: 'no-referrer',
redirect: 'error',
});
let json = null;
try { json = await resp.json(); } catch { /* not JSON */ }
return { status: resp.status, json, retryAfter: resp.headers.get('retry-after') };
}
function encIndex(index) {
return String(index).split(',').map((s) => encodeURIComponent(s.trim())).join(',');
}
// ── 1. claiming ──────────────────────────────────────────────────────────
function readShareId() {
const frag = (location.hash || '').replace(/^#/, '').trim();
return /^[0-9a-f]{32}$/.test(frag) ? frag : null;
}
function ended(title, text, hint) {
$('ended-title').textContent = title;
$('ended-text').textContent = text;
$('ended-hint').textContent = hint || '';
show('ended');
}
async function onClaim(event) {
event.preventDefault();
const input = $('passcode');
const button = $('claim-button');
const error = $('claim-error');
const passcode = input.value.trim();
error.hidden = true;
if (!passcode) {
error.textContent = 'Type the passcode you were sent.';
error.hidden = false;
input.focus();
return;
}
button.disabled = true;
let result;
try {
// The id goes in the body. Never in the path — see rule 2.
result = await call('POST', '/_share/claim', { id: state.shareId, passcode }, false);
} catch {
button.disabled = false;
error.textContent = 'Could not reach the computer that shared this. It may be offline — ask the owner to check, then try again.';
error.hidden = false;
return;
}
button.disabled = false;
const { status, json } = result;
if (status === 200 && json && typeof json.api_key === 'string') {
input.value = '';
// Only now does a session from another share stop being kept.
state.session = saveSession(json);
try { sessionStorage.setItem(LINK_KEY, handleOf(state.shareId)); } catch { /* storage disabled */ }
// The id has done its job; take it out of the address bar.
stripFragment();
state.shareId = null;
enterRoom();
return;
}
if (status === 401 || status === 403) {
error.textContent = 'That passcode is not right. Check it and try again — a few wrong tries lock the link for a while.';
} else if (status === 429) {
const secs = Number(result.retryAfter);
const wait = Number.isFinite(secs) && secs > 0
? (secs >= 120 ? `about ${Math.ceil(secs / 60)} minutes` : `${secs} seconds`)
: 'a little while';
error.textContent = `Too many tries. This link is locked for ${wait}.`;
} else if (status === 410) {
const reason = json && json.error && typeof json.error.reason === 'string' ? json.error.reason : '';
ended(
'This link is no longer active',
reason.includes('used up') ? 'It has already been opened as many times as its owner allowed.'
: reason.includes('revoked') ? 'Its owner has ended it.'
: 'It has expired.',
'Ask the person who sent it for a new one.',
);
return;
} else if (status === 404) {
ended('This link is not recognised', 'The link may be incomplete, or it belongs to a different computer.', 'Check that you copied the whole link, including everything after the # sign.');
return;
} else if (status === 409) {
ended('Sharing is turned off on this computer', 'The owner is running it without authentication, so it will not hand out guest access.', 'Let the person who sent the link know.');
return;
} else {
error.textContent = `Something went wrong (HTTP ${status}). Try again in a moment.`;
}
error.hidden = false;
input.select();
}
// ── 2. the reading room ──────────────────────────────────────────────────
function fmtRemaining(ms) {
if (ms <= 0) return 'now';
const s = Math.floor(ms / 1000);
const d = Math.floor(s / 86400), h = Math.floor((s % 86400) / 3600), m = Math.floor((s % 3600) / 60);
if (d > 0) return `in ${d}d ${h}h`;
if (h > 0) return `in ${h}h ${m}m`;
if (m > 0) return `in ${m}m`;
return `in ${s}s`;
}
function tickExpiry() {
const exp = expiryMs(state.session && state.session.expires_at);
const node = $('room-expiry');
if (exp == null) { node.textContent = 'read-only access'; return; }
const left = exp - Date.now();
if (left <= 0) {
dropSession();
ended('Your access has ended', 'This share has expired.', 'Ask the person who sent it for a new link if you still need it.');
return;
}
const when = new Date(exp);
node.textContent = `access ends ${fmtRemaining(left)} · ${when.toLocaleString()}`;
node.classList.toggle('soon', left < 15 * 60 * 1000);
}
function accessEnded() {
dropSession();
ended('Your access has ended', 'The share expired, or its owner ended it.', 'Ask the person who sent it for a new link if you still need it.');
}
async function enterRoom() {
const s = state.session;
$('room-label').textContent = s.label || s.index;
document.title = `${s.label || 'Shared documents'} · XERJ`;
clear($('results'));
$('more').hidden = true;
$('doc-pane').hidden = true;
$('results-pane').hidden = false;
$('search-mode').textContent = '';
setStatus('');
show('room');
tickExpiry();
if (!state.session) return; // expired between claim and here
state.expiryTimer = setInterval(tickExpiry, 20000);
$('q').focus();
await learnMappings();
probeConsole();
}
/** Walk an ES mapping `properties` tree into [{name, type}]. */
function flattenProps(props, prefix, out) {
for (const [name, def] of Object.entries(props || {})) {
if (!def || typeof def !== 'object') continue;
const full = prefix ? `${prefix}.${name}` : name;
if (def.properties) flattenProps(def.properties, full, out);
else if (typeof def.type === 'string') out.push({ name: full, type: def.type });
}
return out;
}
/**
* One search plan per shared index: which field (if any) is `semantic_text`
* — that is what makes the `hybrid` query available — and which text fields
* a plain `multi_match` should cover.
*/
async function learnMappings() {
const indices = String(state.session.index).split(',').map((x) => x.trim()).filter(Boolean);
let mapping = null;
try {
const r = await call('GET', `/${encIndex(state.session.index)}/_mapping`, undefined, true);
if (r.status === 401 || r.status === 403) return accessEnded();
if (r.status === 200) mapping = r.json;
} catch { /* fall through: search without a field list */ }
state.plans = indices.map((index) => {
const props = mapping && mapping[index] && mapping[index].mappings && mapping[index].mappings.properties;
const flat = flattenProps(props, '', []).filter((f) => !f.name.endsWith('_vector'));
const semantic = flat.find((f) => f.type === 'semantic_text');
const texts = flat.filter((f) => f.type === 'text' || f.type === 'semantic_text').map((f) => f.name);
const ordered = [
...TITLE_FIELDS.filter((f) => texts.includes(f)).map((f) => `${f}^2`),
...texts.filter((f) => !TITLE_FIELDS.includes(f)),
].slice(0, MAX_QUERY_FIELDS);
return { index, semanticField: semantic ? semantic.name : null, fields: ordered };
});
const hybrid = state.plans.filter((p) => p.semanticField).length;
$('search-mode').textContent = hybrid === 0
? 'Keyword search (BM25). Results are ranked by how well the words match.'
: hybrid === state.plans.length
? 'Hybrid search: keyword matching (BM25) fused with vector similarity from the owner\'s embedder. No text is generated.'
: 'Hybrid search where the index supports it, keyword search elsewhere. No text is generated.';
return undefined;
}
/**
* The keyword leg. `multi_match` over the text fields the mapping listed,
* titles boosted. With no field list (the mapping could not be read) it is
* `simple_query_string`, which needs none — this engine refuses a
* `multi_match` without `fields`, and `simple_query_string` never throws on
* what a person types.
*/
function lexicalQuery(plan, q) {
if (plan.fields.length) return { multi_match: { query: q, fields: plan.fields } };
return { simple_query_string: { query: q } };
}
function queryFor(plan, q) {
if (!plan.semanticField) return lexicalQuery(plan, q);
return { hybrid: { queries: [
{ query: lexicalQuery(plan, q), weight: 1 },
{ query: { semantic: { field: plan.semanticField, query: q } }, weight: 1 },
] } };
}
/**
* Named fields, never `*`: this engine's highlighter does not expand a field
* pattern, so a wildcard comes back with no highlight at all. The names are
* the ones being searched (boosts stripped); with no mapping, the usual
* body and title names.
*/
function highlightFields(plan) {
const names = plan.fields.length
? plan.fields.map((f) => f.replace(/\^.*$/, ''))
: [...BODY_FIELDS, ...TITLE_FIELDS];
const fields = {};
for (const name of names) fields[name] = {};
return fields;
}
function searchBody(plan, q, from) {
return {
from,
size: PAGE_SIZE,
track_total_hits: true,
query: queryFor(plan, q),
_source: { excludes: ['*_vector'] },
highlight: {
pre_tags: [HL_PRE],
post_tags: [HL_POST],
fragment_size: 220,
number_of_fragments: 1,
fields: highlightFields(plan),
},
};
}
function termsOf(q) {
return Array.from(new Set(
q.toLowerCase().split(/[^\p{L}\p{N}]+/u).filter((t) => t.length >= 2),
)).slice(0, 12);
}
async function runSearch(q, from) {
if (!state.session) return;
if (!state.plans.length) await learnMappings();
if (!state.session) return;
setStatus('Searching…');
const perIndex = [];
try {
// One request per shared index, each with the query its mapping
// supports. Scores from different query types are not comparable, so
// pages are interleaved by rank rather than merged by score.
for (const plan of state.plans) {
const r = await call('POST', `/${encodeURIComponent(plan.index)}/_search`, searchBody(plan, q, from), true);
if (r.status === 401 || r.status === 403) return accessEnded();
if (r.status !== 200 || !r.json || !r.json.hits) {
const reason = r.json && r.json.error && r.json.error.reason;
setStatus(`The search could not be run${reason ? `: ${String(reason).slice(0, 200)}` : ` (HTTP ${r.status})`}.`, true);
return;
}
perIndex.push(r.json.hits);
}
} catch {
setStatus('Could not reach the computer that shared this. It may be offline.', true);
return;
}
const total = perIndex.reduce((n, h) => n + (h.total && typeof h.total.value === 'number' ? h.total.value : 0), 0);
const lists = perIndex.map((h) => Array.isArray(h.hits) ? h.hits : []);
const merged = [];
for (let rank = 0; rank < PAGE_SIZE; rank += 1) {
for (const list of lists) if (list[rank]) merged.push(list[rank]);
}
if (from === 0) { clear($('results')); state.shown = 0; }
state.query = q;
state.terms = termsOf(q);
state.from = from;
state.total = total;
for (const hit of merged) $('results').appendChild(renderHit(hit));
// Which query the list now shows. Until the answer is in, the previous
// list stays on screen, so a reader (or a test) cannot tell a new result
// from an old one by looking at the rows alone.
$('results').dataset.query = q;
state.shown += merged.length;
const anyFull = lists.some((l) => l.length === PAGE_SIZE);
$('more').hidden = !(anyFull && state.shown < total);
// The vector leg of a hybrid query ranks *something* for any string. When
// not one row on the first page contains a word of the query, say that
// first — a guest looking for a name that is not in the corpus should not
// have to read ten notes to find out.
const rows = Array.from($('results').children);
state.noneContain = rows.length > 0 && rows.every((li) => li.dataset.similarOnly === '1');
setStatus(total === 0 ? `No documents match “${q}”.` : countLine());
}
/**
* "N matching documents" is only true of a keyword search. The vector leg of
* a hybrid query scores every document it looks at, so there the count is
* how many were ranked, not how many contain the words.
*/
function countLine() {
const n = state.total.toLocaleString();
const noun = state.total === 1 ? 'document' : 'documents';
if (state.noneContain) {
return `No document contains “${state.query}”. Showing ${state.shown.toLocaleString()} ranked by vector similarity instead.`;
}
const what = state.plans.some((p) => p.semanticField) ? `${n} ${noun} ranked, best first` : `${n} matching ${noun}`;
return `${what} · showing ${state.shown.toLocaleString()}`;
}
function firstString(source, names) {
for (const name of names) {
const v = source[name];
if (typeof v === 'string' && v.trim()) return v.trim();
}
return null;
}
function titleOf(hit) {
return firstString(hit._source || {}, TITLE_FIELDS) || String(hit._id);
}
/** Append `text` to `parent`, wrapping sentinel-delimited runs in <mark>. */
function appendHighlighted(parent, text) {
let rest = String(text);
for (;;) {
const a = rest.indexOf(HL_PRE);
if (a < 0) break;
const b = rest.indexOf(HL_POST, a + 1);
if (b < 0) break;
if (a > 0) parent.appendChild(document.createTextNode(rest.slice(0, a)));
parent.appendChild(el('mark', null, rest.slice(a + 1, b)));
rest = rest.slice(b + 1);
}
// Whatever is left — including a stray, unpaired delimiter — is text.
const tail = rest.split(HL_PRE).join('').split(HL_POST).join('');
if (tail) parent.appendChild(document.createTextNode(tail));
}
/** Append `text`, marking whole-word-prefix occurrences of the query terms. */
function appendWithTerms(parent, text, terms) {
const value = String(text);
if (!terms.length) { parent.appendChild(document.createTextNode(value)); return; }
const escaped = terms.map((t) => t.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'));
const re = new RegExp(`(${escaped.join('|')})`, 'giu');
let last = 0;
let marks = 0;
for (const m of value.matchAll(re)) {
if (marks >= 2000) break; // a pathological document must not freeze the tab
if (m.index > last) parent.appendChild(document.createTextNode(value.slice(last, m.index)));
parent.appendChild(el('mark', null, m[0]));
last = m.index + m[0].length;
marks += 1;
}
if (last < value.length) parent.appendChild(document.createTextNode(value.slice(last)));
}
/** `size` characters of `text` around the first occurrence of any term. */
function windowAround(text, terms, size) {
const value = String(text).replace(/\s+/g, ' ').trim();
if (value.length <= size) return value;
const lower = value.toLowerCase();
let at = -1;
for (const t of terms) {
const i = lower.indexOf(t);
if (i >= 0 && (at < 0 || i < at)) at = i;
}
const start = at < 0 ? 0 : Math.max(0, at - Math.floor(size / 3));
const end = Math.min(value.length, start + size);
return `${start > 0 ? '…' : ''}${value.slice(start, end)}${end < value.length ? '…' : ''}`;
}
function renderHit(hit) {
const source = hit._source || {};
const li = el('li');
const button = el('button', 'hit');
button.type = 'button';
button.appendChild(el('span', 'hit-title', titleOf(hit)));
const meta = META_FIELDS
.map((f) => (typeof source[f] === 'string' || typeof source[f] === 'number') ? String(source[f]) : null)
.filter(Boolean)
.slice(0, 3);
if (meta.length) button.appendChild(el('span', 'hit-meta', meta.join(' · ').slice(0, 300)));
const snippet = el('span', 'hit-snippet');
// A fragment of the body says more than a fragment of the title, which is
// already on the line above — so body-like fields first.
const hl = hit.highlight && typeof hit.highlight === 'object' ? hit.highlight : {};
const order = [...BODY_FIELDS.filter((f) => f in hl), ...Object.keys(hl).filter((f) => !BODY_FIELDS.includes(f) && !TITLE_FIELDS.includes(f)), ...TITLE_FIELDS.filter((f) => f in hl)];
const fragments = order.flatMap((f) => (Array.isArray(hl[f]) ? hl[f] : [])).filter((f) => typeof f === 'string');
if (fragments.length) {
appendHighlighted(snippet, fragments[0].slice(0, 600));
} else {
// No highlight came back (the hybrid query returns none): cut a window
// around the first query term instead of always showing the opening.
const body = firstString(source, BODY_FIELDS);
if (body) appendWithTerms(snippet, windowAround(body, state.terms, 280), state.terms);
}
if (snippet.firstChild) button.appendChild(snippet);
// The vector leg of a hybrid query ranks documents that share no word with
// the query. Say so on the hit, rather than let a reader hunt for a word
// that is not there.
const plan = state.plans.find((p) => p.index === hit._index);
if (plan && plan.semanticField && state.terms.length) {
const haystack = `${titleOf(hit)} ${firstString(source, BODY_FIELDS) || ''}`.toLowerCase();
if (!state.terms.some((t) => haystack.includes(t))) {
button.appendChild(el('span', 'hit-note', 'Does not contain your words — ranked here by vector similarity.'));
li.dataset.similarOnly = '1';
}
}
button.addEventListener('click', () => openDoc(hit._index, hit._id));
li.appendChild(button);
return li;
}
// ── the document view ────────────────────────────────────────────────────
function isVectorish(name, value) {
return name.endsWith('_vector') ||
(Array.isArray(value) && value.length > 16 && value.every((x) => typeof x === 'number'));
}
function asText(value) {
if (value == null) return '';
if (typeof value === 'string') return value;
if (typeof value === 'number' || typeof value === 'boolean') return String(value);
if (Array.isArray(value) && value.every((x) => x == null || typeof x !== 'object')) return value.join(', ');
try { return JSON.stringify(value, null, 2); } catch { return ''; }
}
async function openDoc(index, id) {
setStatus('Opening…');
let r;
try {
r = await call('GET', `/${encodeURIComponent(index)}/_doc/${encodeURIComponent(id)}?_source_excludes=*_vector`, undefined, true);
} catch {
setStatus('Could not reach the computer that shared this. It may be offline.', true);
return;
}
if (r.status === 401 || r.status === 403) return accessEnded();
if (r.status !== 200 || !r.json || !r.json._source) {
setStatus(`That document could not be opened (HTTP ${r.status}).`, true);
return;
}
const source = r.json._source;
$('doc-title').textContent = firstString(source, TITLE_FIELDS) || String(id);
const meta = $('doc-meta');
const bodyPane = $('doc-body');
clear(meta);
clear(bodyPane);
const bodyName = BODY_FIELDS.find((f) => typeof source[f] === 'string' && source[f].trim());
const long = [];
for (const [name, value] of Object.entries(source)) {
if (name === bodyName || isVectorish(name, value)) continue;
const text = asText(value);
if (!text.trim()) continue;
if (text.length > MAX_INLINE_VALUE || text.includes('\n')) { long.push([name, text]); continue; }
meta.appendChild(el('dt', null, name));
meta.appendChild(el('dd', null, text));
}
meta.hidden = !meta.firstChild;
if (bodyName) {
const block = el('p', 'doc-text');
appendWithTerms(block, source[bodyName], state.terms);
bodyPane.appendChild(block);
}
for (const [name, text] of long) {
bodyPane.appendChild(el('p', 'doc-field-name', name));
const block = el('p', 'doc-text');
appendWithTerms(block, text, state.terms);
bodyPane.appendChild(block);
}
if (!bodyPane.firstChild && !meta.firstChild) bodyPane.appendChild(el('p', 'hint', 'This record has no readable fields.'));
$('results-pane').hidden = true;
$('doc-pane').hidden = false;
setStatus('');
$('doc-back').focus();
window.scrollTo(0, 0);
return undefined;
}
function closeDoc() {
$('doc-pane').hidden = true;
$('results-pane').hidden = false;
if (state.total) setStatus(countLine());
}
// ── sign-out, console hand-off ───────────────────────────────────────────
function signOut() {
dropSession();
clear($('results'));
clear($('doc-meta'));
clear($('doc-body'));
$('doc-title').textContent = '';
$('q').value = '';
ended(
'Signed out',
'This browser no longer holds your access.',
'To read again, open the link you were sent. If it was set to open only once, ask its owner for a new one.',
);
}
/** The console's guest mode ships separately; only offer it where it exists. */
async function probeConsole() {
try {
const r = await fetch('/_xerj-console/src/data/guest.js', { method: 'HEAD', cache: 'no-store', credentials: 'omit', referrerPolicy: 'no-referrer' });
if (!r.ok || !state.session) return;
const s = state.session;
const first = String(s.index).split(',')[0];
$('console-href').href = `/_xerj-console/#/reader?index=${encodeURIComponent(first)}${s.brain ? `&brain=${encodeURIComponent(s.brain)}` : ''}`;
$('console-link').hidden = false;
} catch { /* no console guest mode on this node */ }
}
// ── boot ─────────────────────────────────────────────────────────────────
function boot() {
$('claim-form').addEventListener('submit', onClaim);
$('search-form').addEventListener('submit', (event) => {
event.preventDefault();
const q = $('q').value.trim();
if (!q) { setStatus('Type something to search for.'); return; }
closeDoc();
runSearch(q, 0);
});
$('more').addEventListener('click', () => runSearch(state.query, state.from + PAGE_SIZE));
$('doc-back').addEventListener('click', closeDoc);
$('signout').addEventListener('click', signOut);
// A quick tunnel is Cloudflare's: say so before a passcode is typed.
if (/\.trycloudflare\.com$/i.test(location.hostname)) {
for (const id of ['via-tunnel', 'room-via-tunnel']) $(id).hidden = false;
}
// A link pasted over the one in the address bar differs only in its
// fragment, which no browser treats as a new page: without this the old
// view — often "this link is no longer active", whose advice is to ask for
// a new link — stayed on screen until a manual reload.
window.addEventListener('hashchange', route);
route();
}
/**
* Decide what to show from the address bar and what this tab already holds.
* Runs at load and whenever only the fragment changes.
*/
function route() {
state.shareId = readShareId();
const existing = loadSession();
if (existing && state.shareId && storedHandle() === handleOf(state.shareId)) {
//
5606
The link this tab has already opened. Its key is still here, so do
// NOT ask for the passcode again: on a one-open share that second claim
// is refused ("used up") and the guest — who only clicked the link in
// their email a second time — would be locked out of a share that still
// has days to run. If the key has since been revoked or has expired, the
// room's first request says so.
stripFragment();
state.shareId = null;
if (state.session && !views.room.hidden) return; // already reading
state.session = existing;
enterRoom();
return;
}
if (state.shareId) {
// A link to a different share (or a first visit). Ask for its passcode —
// but whatever this tab holds is kept until that claim SUCCEEDS, so a
// mistyped or dead link does not cost the guest the access they had.
leaveRoom();
$('claim-error').hidden = true;
show('claim');
$('passcode').focus();
return;
}
if (existing) {
if (state.session && !views.room.hidden) return;
state.session = existing;
enterRoom();
return;
}
// No session: a handle on its own means nothing.
try { sessionStorage.removeItem(LINK_KEY); } catch { /* storage disabled */ }
ended(
'This link is incomplete',
'A share link ends with a # sign followed by a long code. That part is missing here.',
'Copy the whole link from the message you were sent and open it again.',
);
}
boot();
})();