feat: implement bff layer
This commit is contained in:
gosangam
+32
-416
@@ -1,429 +1,45 @@
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/**
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* Data access layer for Light of the Bhāgavata (LoB).
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* Data access layer for Light of the Bhāgavata (LOB).
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*
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* Reads from MongoDB via Prisma, same as the rest of the app.
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* LoB is a prose book with no volume structure —
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* we use volume=0 as the sentinel for "no volumes".
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*
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* It has 48 "texts" (numbered chapters) plus 4 intro segments
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* (front-pages, preface, acknowledgement, the-artist).
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*
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* When the DB isn't seeded yet, falls back to reading local JSON files
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* from lib/jsons/books/lob/.
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*
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* Collections used:
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* - book_meta (via Prisma BookMeta model)
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* - prose_chapters (via Prisma ProseChapter model)
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* Delegates to the generic book data layer which calls the BFF API.
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*/
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import { prisma } from "@/lib/db";
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import type { JsonValue } from "@prisma/client/runtime/library";
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import fs from "fs";
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import path from "path";
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import {
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getBookMeta,
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getIntroSegments,
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getIntroSegment,
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getChapter,
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getContent,
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getSidebarItems,
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type BookMeta,
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type IntroSegment,
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type Chapter,
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type SidebarItem,
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} from "@/lib/books";
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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const CODE = "lob";
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/** Volume sentinel for books without volumes. */
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const NO_VOLUME = 0;
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export type LobMeta = BookMeta;
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export type LobChapterEntry = { number: number; title: string };
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export type LobIntroSegment = IntroSegment;
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export type LobChapter = Chapter;
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export type LobSidebarItem = SidebarItem;
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const BOOK = "lob";
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const LOB_JSON_DIR = path.join(process.cwd(), "lib", "jsons", "books", "lob");
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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export type LobMeta = {
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book: string;
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title: string;
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author: string;
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year?: number;
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description: string;
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totalChapters: number;
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chapters: LobChapterEntry[];
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};
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export type LobChapterEntry = {
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number: number;
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title: string;
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};
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export type LobIntroSegment = {
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slug: string;
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title: string;
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type: string;
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book: string;
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order: number;
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paragraphs: string[];
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};
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export type LobChapter = {
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book: string;
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chapter: number | null;
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title: string;
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type: string;
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slug?: string;
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paragraphs: string[];
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};
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/** Union type used in sidebar / table-of-contents navigation. */
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export type LobSidebarItem = {
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/** URL-safe slug: "intro-front-pages", "1", "48", etc. */
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slug: string;
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/** Human-readable label for the sidebar */
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label: string;
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/** "intro-segment" | "chapter" */
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type: string;
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/** Chapter number, or null for non-chapter items */
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chapter: number | null;
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};
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// ---------------------------------------------------------------------------
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// HTML sanitisation (mirrors lib/api.ts)
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// ---------------------------------------------------------------------------
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function sanitizeHtml(html: string): string {
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let clean = html.replace(/<script[\s>][\s\S]*?<\/script>/gi, "");
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clean = clean.replace(/<style[\s>][\s\S]*?<\/style>/gi, "");
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clean = clean.replace(/<iframe[\s>][\s\S]*?<\/iframe>/gi, "");
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clean = clean.replace(
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/<\/?(?:script|style|iframe|object|embed|form|input|textarea|select|button)[^>]*>/gi,
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"",
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);
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clean = clean.replace(/\s+on\w+\s*=\s*(?:"[^"]*"|'[^']*'|[^\s>]+)/gi, "");
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clean = clean.replace(/href\s*=\s*"javascript:[^"]*"/gi, 'href=""');
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clean = clean.replace(/href\s*=\s*'javascript:[^']*'/gi, "href=''");
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return clean;
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export async function getLobMeta() {
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return getBookMeta(CODE);
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}
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/** Normalize paragraphs — handles both native arrays and stringified JSON. */
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function normalizeParagraphs(paragraphs: string[] | JsonValue): string[] {
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let result: string[];
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if (typeof paragraphs === "string") {
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try {
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const parsed = JSON.parse(paragraphs);
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result = Array.isArray(parsed) ? parsed : [paragraphs];
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} catch {
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result = [paragraphs];
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}
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} else if (Array.isArray(paragraphs)) {
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result = paragraphs as string[];
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} else {
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result = [];
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}
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return result.map(sanitizeHtml);
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export async function getLobIntroSegments() {
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return getIntroSegments(CODE);
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}
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// ---------------------------------------------------------------------------
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// Local JSON helpers (fallback when DB is not seeded)
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// ---------------------------------------------------------------------------
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function readLocalJson<T>(filePath: string): T | null {
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if (!fs.existsSync(filePath)) return null;
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try {
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return JSON.parse(fs.readFileSync(filePath, "utf-8")) as T;
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} catch {
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return null;
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}
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export async function getLobIntroSegment(slug: string) {
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return getIntroSegment(CODE, slug);
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}
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function getLocalIntroSegments(): LobIntroSegment[] {
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const introDir = path.join(LOB_JSON_DIR, "intro");
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if (!fs.existsSync(introDir)) return [];
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const results: LobIntroSegment[] = [];
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const files = [
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"front-pages.json",
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"preface.json",
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"acknowledgement.json",
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"the-artist.json",
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];
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for (const file of files) {
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const filePath = path.join(introDir, file);
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const seg = readLocalJson<LobIntroSegment>(filePath);
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if (seg) results.push(seg);
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}
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return results.sort((a, b) => (a.order ?? 0) - (b.order ?? 0));
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export async function getLobChapter(chapterNum: number) {
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return getChapter(CODE, String(chapterNum));
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}
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function getLocalIntroSegment(rawSlug: string): LobIntroSegment | null {
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const filePath = path.join(LOB_JSON_DIR, "intro", `${rawSlug}.json`);
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return readLocalJson<LobIntroSegment>(filePath);
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export async function getLobContent(slug: string) {
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return getContent(CODE, slug);
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}
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function getLocalChapter(chapterNum: number): LobChapter | null {
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const filePath = path.join(
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LOB_JSON_DIR,
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"chapters",
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String(chapterNum).padStart(2, "0") + ".json",
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);
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return readLocalJson<LobChapter>(filePath);
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}
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// ---------------------------------------------------------------------------
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// Book meta
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// ---------------------------------------------------------------------------
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/**
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* Book-level metadata (title, author, chapter list, etc.)
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*/
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export async function getLobMeta(): Promise<LobMeta | null> {
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const meta = await prisma.bookMeta.findUnique({ where: { book: BOOK } });
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if (meta) return meta.data as unknown as LobMeta;
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// Fallback to local JSON
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const introPath = path.join(LOB_JSON_DIR, "intro.json");
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return readLocalJson<LobMeta>(introPath);
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}
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// ---------------------------------------------------------------------------
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// Intro segments
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// ---------------------------------------------------------------------------
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/**
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* All intro segments, ordered by their `order` field.
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*/
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export async function getLobIntroSegments(): Promise<LobIntroSegment[]> {
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const results = await prisma.proseChapter.findMany({
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where: { book: BOOK, volume: NO_VOLUME, type: "intro-segment" },
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orderBy: { order: "asc" },
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});
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if (results.length > 0) {
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return results.map((doc) => ({
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slug: doc.slug,
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title: doc.title,
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type: doc.type,
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book: doc.book,
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order: doc.order,
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paragraphs: normalizeParagraphs(doc.paragraphs),
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}));
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}
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// Fallback to local JSON
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return getLocalIntroSegments();
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}
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/**
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* A single intro segment by slug.
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* Accepts both "intro-front-pages" (URL slug) and "front-pages" (raw slug).
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*/
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export async function getLobIntroSegment(
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slug: string,
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): Promise<LobIntroSegment | null> {
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// DB stores with "intro-" prefix; accept either form
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const dbSlug = slug.startsWith("intro-") ? slug : `intro-${slug}`;
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const rawSlug = slug.startsWith("intro-") ? slug.replace(/^intro-/, "") : slug;
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const doc = await prisma.proseChapter.findUnique({
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where: {
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book_volume_slug: { book: BOOK, volume: NO_VOLUME, slug: dbSlug },
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},
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});
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if (doc) {
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return {
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slug: doc.slug,
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title: doc.title,
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type: doc.type,
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book: doc.book,
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order: doc.order,
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paragraphs: normalizeParagraphs(doc.paragraphs),
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};
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}
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// Fallback to local JSON
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const local = getLocalIntroSegment(rawSlug);
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if (!local) return null;
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return {
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...local,
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slug: dbSlug,
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paragraphs: local.paragraphs.map(sanitizeHtml),
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};
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}
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// ---------------------------------------------------------------------------
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// Chapters (Texts 1–48)
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// ---------------------------------------------------------------------------
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/**
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* A numbered text/chapter (1–48).
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*/
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export async function getLobChapter(
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chapterNum: number,
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): Promise<LobChapter | null> {
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if (chapterNum < 1 || chapterNum > 48 || !Number.isInteger(chapterNum)) {
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return null;
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}
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const doc = await prisma.proseChapter.findUnique({
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where: {
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book_volume_slug: {
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book: BOOK,
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volume: NO_VOLUME,
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slug: String(chapterNum),
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},
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},
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});
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if (doc) {
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return {
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book: doc.book,
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chapter: doc.chapter,
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title: doc.title,
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type: doc.type,
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slug: doc.slug,
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paragraphs: normalizeParagraphs(doc.paragraphs),
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};
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}
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// Fallback to local JSON
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const local = getLocalChapter(chapterNum);
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if (!local) return null;
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return {
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...local,
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paragraphs: local.paragraphs.map(sanitizeHtml),
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};
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}
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// ---------------------------------------------------------------------------
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// Unified content accessor
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// ---------------------------------------------------------------------------
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/**
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* Get content by URL slug.
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*
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* "intro-front-pages" → intro segment
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* "intro-preface" → intro segment
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* "intro-acknowledgement" → intro segment
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* "intro-the-artist" → intro segment
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* "1" … "48" → chapter (text)
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*/
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export async function getLobContent(
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slug: string,
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): Promise<LobChapter | LobIntroSegment | null> {
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if (slug.startsWith("intro-")) {
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return getLobIntroSegment(slug);
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}
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const num = Number(slug);
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if (!Number.isNaN(num) && Number.isInteger(num) && num >= 1 && num <= 48) {
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return getLobChapter(num);
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}
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return null;
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}
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// ---------------------------------------------------------------------------
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// Sidebar navigation
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// ---------------------------------------------------------------------------
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/**
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* Build the full sidebar navigation list.
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*
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* Order: front-pages → preface → acknowledgement → the-artist → texts 1–48
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*/
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export async function getLobSidebarItems(): Promise<LobSidebarItem[]> {
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const [meta, allDocs] = await Promise.all([
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getLobMeta(),
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prisma.proseChapter.findMany({
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where: { book: BOOK, volume: NO_VOLUME },
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orderBy: { order: "asc" },
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select: { slug: true, title: true, type: true, chapter: true, order: true },
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}),
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]);
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// If we got DB results, build from those
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if (meta && allDocs.length > 0) {
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return buildSidebarFromDocs(meta, allDocs);
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}
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// Fallback: build from local JSON
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return buildSidebarFromLocal(meta);
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}
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function buildSidebarFromDocs(
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meta: LobMeta,
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allDocs: { slug: string; title: string; type: string; chapter: number | null; order: number | null }[],
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): LobSidebarItem[] {
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const items: LobSidebarItem[] = [];
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// Intro segments (all come before chapters; LoB has no back matter)
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for (const doc of allDocs) {
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if (doc.type === "intro-segment") {
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items.push({
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slug: doc.slug,
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label: doc.title,
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type: "intro-segment",
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chapter: null,
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});
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}
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}
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// Texts 1–48 (use meta.chapters for consistent title/ordering)
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for (const ch of meta.chapters) {
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items.push({
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slug: String(ch.number),
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label: `Text ${ch.number}: ${ch.title}`,
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type: "chapter",
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chapter: ch.number,
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});
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}
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return items;
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}
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function buildSidebarFromLocal(meta: LobMeta | null): LobSidebarItem[] {
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const items: LobSidebarItem[] = [];
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// Local intro segments (front matter only — LoB has no back matter)
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const introSegs = getLocalIntroSegments();
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for (const seg of introSegs) {
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items.push({
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slug: `intro-${seg.slug}`,
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label: seg.title,
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type: "intro-segment",
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chapter: null,
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});
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}
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// Texts from meta or generate default 1-48
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if (meta && meta.chapters) {
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for (const ch of meta.chapters) {
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items.push({
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slug: String(ch.number),
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label: `Text ${ch.number}: ${ch.title}`,
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type: "chapter",
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chapter: ch.number,
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});
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}
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} else {
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// Fallback: scan local chapter JSONs
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const chaptersDir = path.join(LOB_JSON_DIR, "chapters");
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if (fs.existsSync(chaptersDir)) {
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const files = fs
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.readdirSync(chaptersDir)
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.filter((f) => f.endsWith(".json"))
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.sort();
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for (const file of files) {
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const ch = readLocalJson<LobChapter>(path.join(chaptersDir, file));
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if (ch) {
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const num = ch.chapter ?? parseInt(file.replace(".json", ""), 10);
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items.push({
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slug: String(num),
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label: `Text ${num}: ${ch.title}`,
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type: "chapter",
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chapter: num,
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});
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}
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}
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}
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}
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return items;
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export async function getLobSidebarItems() {
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return getSidebarItems(CODE);
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}
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