feat: add ssr

lib/te.ts

@@ -0,0 +1,164 @@
+/**
+ * Data access layer for Two Essays (TE).
+ *
+ * Reads from MongoDB via Prisma.
+ * TE is a collection of 2 standalone essays using the `essays` collection
+ * (not `prose_chapters`). Essays are grouped by `group: "two-essays"`.
+ *
+ * Collections used:
+ *   - book_meta (via Prisma BookMeta model)
+ *   - essays (via Prisma Essay model)
+ */
+
+import { prisma } from "@/lib/db";
+import type { JsonValue } from "@prisma/client/runtime/library";
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+const GROUP = "two-essays";
+const BOOK = "te";
+
+// ---------------------------------------------------------------------------
+// Types
+// ---------------------------------------------------------------------------
+
+export type TeMeta = {
+  group: string;
+  title: string;
+  author: string;
+  year: number;
+  description: string;
+  essays: TeEssayEntry[];
+};
+
+export type TeEssayEntry = {
+  slug: string;
+  title: string;
+  order: number;
+};
+
+export type TeEssay = {
+  slug: string;
+  title: string;
+  author: string;
+  year: number | null;
+  group: string | null;
+  order: number;
+  paragraphs: string[];
+};
+
+export type TeSidebarItem = {
+  slug: string;
+  label: string;
+};
+
+// ---------------------------------------------------------------------------
+// HTML sanitisation (mirrors lib/ej.ts)
+// ---------------------------------------------------------------------------
+
+function sanitizeHtml(html: string): string {
+  let clean = html.replace(/<script[\s>][\s\S]*?<\/script>/gi, "");
+  clean = clean.replace(/<style[\s>][\s\S]*?<\/style>/gi, "");
+  clean = clean.replace(/<iframe[\s>][\s\S]*?<\/iframe>/gi, "");
+  clean = clean.replace(
+    /<\/?(?:script|style|iframe|object|embed|form|input|textarea|select|button)[^>]*>/gi,
+    "",
+  );
+  clean = clean.replace(/\s+on\w+\s*=\s*(?:"[^"]*"|'[^']*'|[^\s>]+)/gi, "");
+  clean = clean.replace(/href\s*=\s*"javascript:[^"]*"/gi, 'href=""');
+  clean = clean.replace(/href\s*=\s*'javascript:[^']*'/gi, "href=''");
+  return clean;
+}
+
+/** Normalize paragraphs — handles both native arrays and stringified JSON. */
+function normalizeParagraphs(paragraphs: string[] | JsonValue): string[] {
+  let result: string[];
+
+  if (typeof paragraphs === "string") {
+    try {
+      const parsed = JSON.parse(paragraphs);
+      result = Array.isArray(parsed) ? parsed : [paragraphs];
+    } catch {
+      result = [paragraphs];
+    }
+  } else if (Array.isArray(paragraphs)) {
+    result = paragraphs as string[];
+  } else {
+    result = [];
+  }
+
+  return result.map(sanitizeHtml);
+}
+
+// ---------------------------------------------------------------------------
+// Book meta
+// ---------------------------------------------------------------------------
+
+/**
+ * Book-level metadata (title, author, essay list, etc.)
+ */
+export async function getTeMeta(): Promise<TeMeta | null> {
+  const meta = await prisma.bookMeta.findUnique({ where: { book: BOOK } });
+  if (!meta) return null;
+  return meta.data as unknown as TeMeta;
+}
+
+// ---------------------------------------------------------------------------
+// Essays
+// ---------------------------------------------------------------------------
+
+/**
+ * All essays in the "two-essays" group, ordered by `order`.
+ */
+export async function getTeEssays(): Promise<TeEssay[]> {
+  const results = await prisma.essay.findMany({
+    where: { group: GROUP },
+    orderBy: { order: "asc" },
+  });
+
+  return results.map((doc) => ({
+    slug: doc.slug,
+    title: doc.title,
+    author: doc.author,
+    year: doc.year,
+    group: doc.group,
+    order: doc.order,
+    paragraphs: normalizeParagraphs(doc.paragraphs),
+  }));
+}
+
+/**
+ * A single essay by slug.
+ */
+export async function getTeEssay(slug: string): Promise<TeEssay | null> {
+  const doc = await prisma.essay.findUnique({ where: { slug } });
+  if (!doc) return null;
+
+  return {
+    slug: doc.slug,
+    title: doc.title,
+    author: doc.author,
+    year: doc.year,
+    group: doc.group,
+    order: doc.order,
+    paragraphs: normalizeParagraphs(doc.paragraphs),
+  };
+}
+
+// ---------------------------------------------------------------------------
+// Sidebar navigation
+// ---------------------------------------------------------------------------
+
+/**
+ * Build the sidebar navigation list from meta.
+ */
+export async function getTeSidebarItems(): Promise<TeSidebarItem[]> {
+  const meta = await getTeMeta();
+  if (!meta) return [];
+  return meta.essays.map((e) => ({
+    slug: e.slug,
+    label: e.title,
+  }));
+}