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// SPDX-License-Identifier: Apache-2.0
/**
* @module Generators/NewsIndexes/Backfill
* @description Legacy article HTML SEO repair helpers, factored out of
* `news-indexes.ts` (Refactor 8/8). All public names (`applyArticleSeoBackfill`,
* `backfillLegacyArticleSeo`, `healJsonLdDescriptionCorruption`,
* `backfillArticleHreflang`, `buildLegacyBackfillDescription`) keep their
* original exported signatures so the regression test suites in
* `test/unit/news-indexes-*.test.js` keep importing from the barrel.
*/
import path from 'path';
import fs from 'fs';
import { NEWS_DIR } from '../../constants/config.js';
import { ARTICLE_TYPE_LABELS, getLocalizedString } from '../../constants/languages.js';
import {
formatSlug,
parseArticleFilename,
extractArticleMeta,
escapeHTML,
atomicWrite,
} from '../../utils/file-utils.js';
import { detectCategory } from '../../utils/article-category.js';
import { buildSeoKeywords, resolveArticleMetadata } from '../../aggregator/article-metadata.js';
import { SEO_CONTEXT_LABELS } from '../../aggregator/metadata/template-fallback.js';
import {
stripTruncatedReaderLabel,
hasTruncatedReaderLabelInBody,
} from './backfill-reader-label.js';
import type { ArticleCategoryLabels, LanguageCode } from '../../types/index.js';
const MIN_ARTICLE_DESCRIPTION_LENGTH = 120;
/** Language labels used only in forced legacy backfill prefixes. */
const LEGACY_LANGUAGE_LABELS: Record<LanguageCode, string> = {
en: 'English',
sv: 'Svenska',
da: 'Dansk',
no: 'Norsk',
fi: 'Suomi',
de: 'Deutsch',
fr: 'Français',
es: 'Español',
nl: 'Nederlands',
ar: 'العربية',
he: 'עברית',
ja: '日本語',
ko: '한국어',
zh: '中文',
};
/**
* Regex pattern that flags internal artefact identifiers
* (`<slug>-run<N>-<unix-ts>`). Used by
* {@link descriptionHasLeakyToken} to force backfill of legacy articles
* whose `<meta description>` was authored before the resolver started
* stripping run-ids and "analysis run" jargon. Mirrors
* `FORBIDDEN_PATTERNS` in `scripts/validate-manifest-seo.js`.
*/
const LEAKY_RUNID_RE = /\b[a-z][a-z-]*-run-?\d+-\d{8,}\b/iu;
/**
* Backfill SEO metadata for legacy article HTML files that pre-date the
* current article generator. This keeps historic pages from carrying short
* or duplicate descriptions while the canonical generator handles new runs.
*
* @param filenames - News article filenames to inspect
* @returns Number of HTML files updated
*/
export function backfillLegacyArticleSeo(filenames: readonly string[]): number {
const descriptions = new Map<string, number>();
for (const filename of filenames) {
const meta = extractArticleMeta(path.join(NEWS_DIR, filename));
if (!meta.description) continue;
descriptions.set(meta.description, (descriptions.get(meta.description) ?? 0) + 1);
}
let updated = 0;
for (const filename of filenames) {
if (backfillOneLegacyArticleSeo(filename, descriptions)) updated++;
}
return updated;
}
/**
* Heal JSON-LD `description` field corruption left behind by a prior
* version of {@link applyArticleSeoBackfill}. The old regex
* `"description":"[^"]*"` terminated at the first JSON-escaped quote
* (`\"`), so every rebuild prepended a new value in front of the
* previous description's tail — producing an unparseable JSON-LD
* block whose `description` value was followed by a run of repeated
* fragments before `,"datePublished"`.
*
* This pass is idempotent: when the JSON-LD is already well-formed,
* the regex `[^,]*` matches the empty string and the file is left
* unchanged. It runs unconditionally because the original backfill
* path skips files whose `<meta name="description">` is already
* clean, even when their JSON-LD is corrupted.
*
* @param filenames - News article filenames to inspect
* @returns Number of HTML files updated
*/
export function healJsonLdDescriptionCorruption(filenames: readonly string[]): number {
let updated = 0;
for (const filename of filenames) {
const filepath = path.join(NEWS_DIR, filename);
const html = readArticleHtml(filepath);
if (!html) continue;
const next = html.replace(/("description":"(?:\\.|[^"\\])*")[^,]*(,"datePublished")/u, '$1$2');
if (next === html) continue;
atomicWrite(filepath, next);
updated++;
}
return updated;
}
/**
* Backfill one article file when its metadata is missing, short or duplicate.
*
* @param filename - News article filename
* @param descriptions - Description frequency map for duplicate detection
* @returns True when the file was updated
*/
function backfillOneLegacyArticleSeo(
filename: string,
descriptions: ReadonlyMap<string, number>
): boolean {
const filepath = path.join(NEWS_DIR, filename);
const parsed = parseArticleFilename(filename);
if (!parsed) return false;
const meta = extractArticleMeta(filepath);
const html = readArticleHtml(filepath);
if (!html) return false;
const hasKeywords = /<meta name="keywords" content="[^"]+"/u.test(html);
const needsDescription =
shouldBackfillDescription(meta.description, descriptions) ||
hasLegacyTruncatedReaderLabel(parsed.date, parsed.slug, parsed.lang, meta.description);
if (hasKeywords && !needsDescription) return false;
// Suppress leaky tokens (run-ids, "analysis run" jargon) from both
// the Markdown body we feed the resolver AND the `manifest.description`
// override, so the resolver derives `<meta description>` from a clean
// editorial signal rather than echoing the legacy junk back unchanged.
const titleHasLeaks = descriptionHasLeakyToken(meta.title);
const descHasLeaks = descriptionHasLeakyToken(meta.description);
const safeTitle = titleHasLeaks ? formatSlug(parsed.slug) : meta.title;
// Strip any legacy dateline prefix + redundant date label from a
// previously-backfilled description before re-feeding it to the
// resolver. Without this, the resolver re-clamps the prefixed buffer
// against the per-script metaDescription budget and truncates the
// reader-facing clause mid-phrase (dangling-participle regression in
// `news/2026-04-26-week-ahead-ko.html`).
const safeDescription = descHasLeaks
? ''
: stripLegacyBackfillContext(parsed.date, parsed.slug, parsed.lang, meta.description);
const articleType = String(detectCategory(parsed.slug));
const resolved = resolveArticleMetadata({
articleType,
date: parsed.date,
markdown: `# ${safeTitle || formatSlug(parsed.slug)}\n\n${safeDescription}`,
manifest: buildBackfillManifest(parsed.slug, safeTitle, safeDescription, needsDescription),
});
const entry = Object.getOwnPropertyDescriptor(resolved, parsed.lang)?.value as
| { readonly title: string; readonly description: string; readonly keywords: readonly string[] }
| undefined;
const fallbackKeywords = buildSeoKeywords(
parsed.lang,
articleType,
parsed.date,
parsed.slug,
safeTitle,
safeDescription
);
// Never echo a leaky description into the rewrite, even as a last-resort
// fallback. If the resolver produced nothing clean, fall back to a
// page-specific stub built from the slug.
const resolverDescription = entry?.description ?? '';
const baseDescription =
resolverDescription && !descriptionHasLeakyToken(resolverDescription)
? resolverDescription
: safeDescription || formatSlug(parsed.slug);
const description = needsDescription
? buildLegacyBackfillDescription(parsed.date, parsed.slug, parsed.lang, baseDescription, {
forceContextPrefix: true,
})
: meta.description;
const keywords = entry?.keywords ?? fallbackKeywords;
const nextHtml = applyArticleSeoBackfill(html, description, keywords);
if (nextHtml === html) return false;
atomicWrite(filepath, nextHtml);
return true;
}
/**
* Prefix legacy descriptions with date and **localized** category label
* so duplicate strings become page-specific before the 180-character
* snippet cap. Two-tier strategy:
*
* 1. **Substantive resolver output** (≥{@link MIN_ARTICLE_DESCRIPTION_LENGTH}
* chars) is returned **unchanged** — no prefix is prepended. The
* description is already unique per page because it contains
* article-specific editorial content (named bills, vote outcomes,
* coalition dynamics). Adding a bureaucratic prefix in that case
* only steals SERP characters from real content.
* 2. **Short / placeholder** descriptions get a localized prefix
* `${date} — ${ARTICLE_TYPE_LABELS[lang][category]} —` so the
* duplicate-deduper still works on legacy articles whose
* `<meta description>` is `formatSlug(slug)`-only or a generic stub.
* The category noun is **translated** via {@link ARTICLE_TYPE_LABELS}
* so Arabic / Hebrew / Swedish cards no longer carry the English
* "EN Committee Reports" wart that the prior single-language
* `formatSlug(slug)` form produced.
*
* @param date - Article date (ISO YYYY-MM-DD)
* @param slug - Article slug (used to derive the category)
* @param lang - Article language (ISO 639-1 lower-case code)
* @param description - Candidate description (resolver output preferred)
* @param options - Backfill options
* @param options.forceContextPrefix - Force date/language/category prefix
* even when the description is already substantive
* @returns Page-specific description, prefix-free when description is
* already substantive
*/
export function buildLegacyBackfillDescription(
date: string,
slug: string,
lang: string,
description: string,
options: { readonly forceContextPrefix?: boolean } = {}
): string {
const trimmedDescription = description.trim();
if (trimmedDescription.length >= MIN_ARTICLE_DESCRIPTION_LENGTH && !options.forceContextPrefix) {
return capDescriptionLength(trimmedDescription);
}
const langCode = (lang || 'en').toLowerCase() as LanguageCode;
const category = detectCategory(slug);
const categoryLabels = getLocalizedString(ARTICLE_TYPE_LABELS, langCode) as ArticleCategoryLabels;
const label = categoryLabels[category] ?? formatSlug(slug);
const prefix = computeLegacyPrefix(date, slug, langCode);
// Idempotency guard: when this helper is called against an HTML that
// already carries a backfilled description (re-running backfill on
// a previously-processed file, or a `forceContextPrefix:true` call
// whose input was the prior pass' output), the trimmed description
// already starts with `${date} — ${languageLabel} — ${label} — `.
// Without this strip, the prefix is doubled, producing
// "2026-05-26 — 日本語 — Breaking — 2026-05-26 — 日本語 — Breaking — …"
// (live regression in `news/2026-05-26-breaking-{ja,ko}.html`).
//
// We also strip the localized `${labels.date} ${date}.` clause the
// per-language resolver appends, because the dateline prefix already
// carries the date — leaving it in would emit a redundant
// "发布日期 / 게시일 YYYY-MM-DD." suffix (live regression in
// `news/2026-04-01-breaking-zh.html` / `2026-03-31-breaking-ko.html`).
const body =
stripRedundantDateLabel(
stripDuplicatedLegacyPrefix(trimmedDescription, prefix),
langCode,
date
) || label;
const contextual = `${prefix} — ${body}`.replace(/\s+/g, ' ').trim();
return capDescriptionLength(contextual);
}
/**
* Compute the localized dateline prefix
* (`${date} — ${languageLabel} — ${categoryLabel}[ — ${qualifier}]`)
* prepended to short / placeholder legacy descriptions.
*
* @param date - Article date (ISO YYYY-MM-DD)
* @param slug - Article slug (used to derive the category + qualifier)
* @param langCode - Article language code
* @returns Em-dash-joined dateline prefix
*/
function computeLegacyPrefix(date: string, slug: string, langCode: LanguageCode): string {
const category = detectCategory(slug);
const categoryLabels = getLocalizedString(ARTICLE_TYPE_LABELS, langCode) as ArticleCategoryLabels;
const label = categoryLabels[category] ?? formatSlug(slug);
const qualifier = buildLegacySlugQualifier(slug, label);
const languageLabel = legacyLanguageLabel(langCode);
return [date, languageLabel, label, qualifier].filter((part) => part.length > 0).join(' — ');
}
/**
* Strip the legacy dateline prefix **and** the redundant localized
* date-label clause from a candidate description, returning the
* reader-facing body in isolation. Used to clean a previously-backfilled
* `<meta description>` before it is re-fed to the per-language SEO
* resolver — without this, the resolver re-clamps the prefixed buffer
* against the CJK metaDescription budget and truncates the reader label
* mid-clause (live regression in `news/2026-04-26-week-ahead-ko.html`,
* a dangling "추적하는." participle).
*
* @param date - Article date (ISO YYYY-MM-DD)
* @param slug - Article slug
* @param lang - Article language code
* @param description - Candidate description (possibly already prefixed)
* @returns Reader-facing body with prefix + date label removed
*/
export function stripLegacyBackfillContext(
date: string,
slug: string,
lang: string,
description: string
): string {
const langCode = (lang || 'en').toLowerCase() as LanguageCode;
const prefix = computeLegacyPrefix(date, slug, langCode);
return stripTruncatedReaderLabel(
stripRedundantDateLabel(
stripDuplicatedLegacyPrefix(description.trim(), prefix),
langCode,
date
),
langCode
);
}
/**
* Detect whether a legacy `<meta description>` ends with a truncated reader
* label once its dateline prefix and redundant date-label are removed.
* @param date - Article date string (YYYY-MM-DD)
* @param slug - Article slug identifier
* @param lang - Language code (e.g. 'en', 'sv')
* @param description - Meta description to check
* @returns True if the description ends with a truncated reader label
*/
function hasLegacyTruncatedReaderLabel(
date: string,
slug: string,
lang: string,
description: string
): boolean {
if (!description) return false;
const langCode = (lang || 'en').toLowerCase() as LanguageCode;
const prefix = computeLegacyPrefix(date, slug, langCode);
const body = stripRedundantDateLabel(
stripDuplicatedLegacyPrefix(description.trim(), prefix),
langCode,
date
);
return hasTruncatedReaderLabelInBody(body, langCode);
}
/**
* Strip one or more leading copies of the legacy backfill prefix from a
* description candidate to keep {@link buildLegacyBackfillDescription}
* idempotent. The prefix may be followed by the canonical ` — `
* separator **or** a bare space — older passes joined a duplicated
* prefix to the body with a single space (live corruption in
* `news/2026-04-17-committee-reports-zh.html`), so both separators are
* tolerated and the strip repeats until the leading prefix is gone.
*
* @param trimmedDescription - Trimmed candidate description
* @param prefix - Prefix that would be prepended by this backfill pass
* @returns Description with any leading legacy prefix removed
*/
function stripDuplicatedLegacyPrefix(trimmedDescription: string, prefix: string): string {
Iif (!trimmedDescription || !prefix) return trimmedDescription;
const escaped = prefix.replace(/[.*+?^${}()|[\]\\]/gu, '\\$&');
const leadingPrefix = new RegExp(`^${escaped}(?:\\s*—\\s*|\\s+)`, 'u');
let out = trimmedDescription.trim();
let previous: string | null = null;
while (out !== previous) {
previous = out;
out = out.replace(leadingPrefix, '').trim();
}
return out;
}
/**
* Remove the localized `${labels.date} ${date}[.]` clause emitted by the
* per-language SEO resolver. In the legacy-backfill path the dateline
* prefix already carries the date, so leaving the resolver's date label
* in place produces a redundant "Published / 发布日期 / 게시일 YYYY-MM-DD."
* suffix.
*
* @param description - Candidate description (resolver output)
* @param langCode - Article language code
* @param date - Article date (ISO YYYY-MM-DD)
* @returns Description with the redundant date-label clause removed
*/
function stripRedundantDateLabel(
description: string,
langCode: LanguageCode,
date: string
): string {
Iif (!description) return description;
const labels = getLocalizedString(SEO_CONTEXT_LABELS, langCode);
const escapedLabel = labels.date.replace(/[.*+?^${}()|[\]\\]/gu, '\\$&');
const dateLabelClause = new RegExp(`\\s*${escapedLabel}\\s*${date}\\.?`, 'gu');
return description.replace(dateLabelClause, '').replace(/\s+/g, ' ').trim();
}
/**
* Resolve the human language label used to make otherwise-identical
* cross-locale legacy descriptions unique.
*
* @param lang - Language code
* @returns Local language name, or the raw code if unknown
*/
function legacyLanguageLabel(lang: LanguageCode): string {
const descriptor = Object.getOwnPropertyDescriptor(LEGACY_LANGUAGE_LABELS, lang);
return typeof descriptor?.value === 'string' ? descriptor.value : lang;
}
/**
* Build an optional slug-derived qualifier for legacy pages that share the
* same date and article category (for example same-day `*-run2` variants).
*
* @param slug - Article slug without date/language suffix
* @param localizedLabel - Localized category label already present in prefix
* @returns Human-readable qualifier, or empty when it would duplicate label
*/
function buildLegacySlugQualifier(slug: string, localizedLabel: string): string {
const formatted = formatSlug(slug).trim();
Iif (!formatted) return '';
const normalizedFormatted = normalizeLegacyQualifier(formatted);
const normalizedLabel = normalizeLegacyQualifier(localizedLabel);
if (!normalizedFormatted || normalizedFormatted === normalizedLabel) return '';
return formatted;
}
/**
* Normalize a prefix component for duplicate detection.
*
* @param value - Candidate text
* @returns Lower-case alphanumeric text
*/
function normalizeLegacyQualifier(value: string): string {
return value
.toLowerCase()
.replace(/[^\p{L}\p{N}]+/gu, ' ')
.trim();
}
/**
* Clamp a description to the 180-character SERP-friendly cap with a
* trailing ellipsis when truncated. Extracted from
* {@link buildLegacyBackfillDescription} so both the prefix-free and
* prefixed branches share identical clamping behaviour.
*
* @param text - Candidate description
* @returns Description ≤180 chars, ending with `…` on truncation
*/
function capDescriptionLength(text: string): string {
if (text.length <= 180) return text;
return `${text.slice(0, 177).replace(/[.,;:—\s-]+$/u, '')}…`;
}
/**
* Detect whether a legacy article description contains the run-id or
* "analysis run" jargon that was prevalent in pre-aggregator brief
* authorship. These tokens are deemed unfit for `<meta description>`
* regardless of length and force a backfill rewrite.
*
* @param description - Current description value
* @returns True when the description contains a forbidden internal token
*/
function descriptionHasLeakyToken(description: string): boolean {
if (!description) return false;
const lower = description.toLowerCase();
if (lower.includes('analysis run')) return true;
return LEAKY_RUNID_RE.test(description);
}
/**
* Determine whether a meta description needs backfilling.
*
* @param description - Current description
* @param descriptions - Description frequency map
* @returns True when the description is missing, short, duplicated, or
* contains internal run-id tokens that must not appear in SEO surfaces
*/
function shouldBackfillDescription(
description: string,
descriptions: ReadonlyMap<string, number>
): boolean {
return (
!description ||
description.length < MIN_ARTICLE_DESCRIPTION_LENGTH ||
(descriptions.get(description) ?? 0) > 1 ||
descriptionHasLeakyToken(description)
);
}
/**
* Build the manifest projection for legacy SEO backfill.
*
* @param runId - Stable slug/run id
* @param title - Current article title
* @param description - Current article description
* @param includeDescription - Whether to use the current description as a manifest override
* @returns Manifest projection accepted by `resolveArticleMetadata`
*/
function buildBackfillManifest(
runId: string,
title: string,
description: string,
includeDescription: boolean
): { readonly runId: string; readonly title: string; readonly description?: string } {
return {
runId,
title,
...(includeDescription ? { description } : {}),
};
}
/**
* Read an article HTML file, returning an empty string when unavailable.
*
* @param filepath - Absolute HTML file path
* @returns File content or empty string
*/
function readArticleHtml(filepath: string): string {
try {
return path.isAbsolute(filepath) ? requireFsRead(filepath) : '';
} catch {
return '';
}
}
/**
* Isolated file read helper to keep try/catch bodies small.
*
* @param filepath - Absolute file path
* @returns File text
*/
function requireFsRead(filepath: string): string {
return fs.readFileSync(filepath, 'utf8');
}
/**
* Apply SEO meta tag replacements to a complete article HTML document.
* Exported for the regression test in
* `test/unit/news-indexes-jsonld-description-regex.test.js`.
*
* @param html - Existing article HTML
* @param description - Backfilled meta description
* @param keywords - Backfilled keyword list
* @returns Updated HTML
*/
export function applyArticleSeoBackfill(
html: string,
description: string,
keywords: readonly string[]
): string {
const safeDescription = escapeHTML(description);
const safeKeywords = escapeHTML(keywords.join(', '));
let next = html
.replace(
/<meta name="description" content="[^"]*">/u,
`<meta name="description" content="${safeDescription}">`
)
.replace(
/<meta property="og:description" content="[^"]*">/u,
`<meta property="og:description" content="${safeDescription}">`
)
.replace(
/<meta name="twitter:description" content="[^"]*">/u,
`<meta name="twitter:description" content="${safeDescription}">`
);
if (/<meta name="keywords" content="[^"]*">/u.test(next)) {
next = next.replace(
/<meta name="keywords" content="[^"]*">/u,
`<meta name="keywords" content="${safeKeywords}">`
);
} else {
next = next.replace(
/(<meta name="description" content="[^"]*">\n)/u,
`$1 <meta name="keywords" content="${safeKeywords}">\n`
);
}
const jsonDescription = JSON.stringify(description).slice(1, -1).replace(/</g, '\\u003c');
// Match a JSON string value safely: every `"` inside the description
// is JSON-escaped as `\"`, so the inner pattern must accept either an
// escape sequence (`\\.`) or a non-quote/non-backslash character —
// otherwise the match terminates at the first `\"` and leaves the
// tail of the previous description in place, which on subsequent
// prebuild runs appears to "duplicate" the description fragment.
next = next.replace(/"description":"(?:\\.|[^"\\])*"/u, `"description":"${jsonDescription}"`);
// Heal any previously-corrupted JSON-LD where the old buggy regex
// left an orphan tail between the description's closing quote and
// the next known field (`,"datePublished"`). The pattern is
// idempotent: when there is no orphan, `[^,]*` matches the empty
// string and the file is unchanged.
next = next.replace(/("description":"(?:\\.|[^"\\])*")[^,]*(,"datePublished")/u, '$1$2');
return next;
}
export { backfillArticleHreflang } from './backfill-hreflang.js';
|