feat: share post to other apps

lib/og.ts

@@ -385,3 +385,88 @@ export function ogDefault() {
     quote: SITE_DESCRIPTION,
   });
 }
+
+// ---------------------------------------------------------------------------
+// Social: profile + post OG cards
+// ---------------------------------------------------------------------------
+//
+// Profiles and posts get their own image-rendering routes (see
+// app/api/og/profile/[handle] and app/api/og/post/[id]) so the card
+// can carry avatars, author bylines, and (for posts) the attached
+// image. The helpers below just produce the Metadata object pointing
+// at those routes. They live here rather than inline in share-og.ts
+// so non-share entrypoints (e.g. a profile/post page that adds its
+// own `generateMetadata`) can reuse the same builder.
+
+/** OG metadata for a public user profile (`/u/<handle>`). */
+export function ogForProfile(p: {
+  handle: string;
+  name: string;
+  postCount?: number;
+}) {
+  const imageUrl = new URL(
+    `/api/og/profile/${encodeURIComponent(p.handle)}`,
+    SITE_URL,
+  ).toString();
+  const title = `${p.name} (@${p.handle})`;
+  const stats =
+    typeof p.postCount === "number"
+      ? `${p.postCount} post${p.postCount === 1 ? "" : "s"} on Prabhupāda Says`
+      : "Reading shared on Prabhupāda Says";
+  return {
+    title,
+    description: stats,
+    openGraph: {
+      title,
+      description: stats,
+      images: [{ url: imageUrl, width: 1200, height: 630, alt: title }],
+      siteName: "Prabhupāda Says",
+    },
+    twitter: {
+      card: "summary_large_image" as const,
+      title,
+      description: stats,
+      images: [imageUrl],
+    },
+  };
+}
+
+/** OG metadata for a single post (`/u/<handle>/posts#post-<id>` shares). */
+export function ogForPost(p: {
+  id: string;
+  caption: string;
+  source_title?: string | null;
+  author_name?: string | null;
+  author_handle?: string | null;
+}) {
+  const imageUrl = new URL(
+    `/api/og/post/${encodeURIComponent(p.id)}`,
+    SITE_URL,
+  ).toString();
+  const byline = p.author_handle
+    ? `${p.author_name ?? p.author_handle} (@${p.author_handle})`
+    : p.author_name ?? "Prabhupāda Says";
+  const reference = p.source_title?.trim() || "Prabhupāda Says";
+  // Description is shown in some unfurlers (Slack, Discord) when the
+  // image fails to load — keep the caption visible there too.
+  const truncatedCaption =
+    p.caption.length > 200 ? p.caption.slice(0, 197) + "…" : p.caption;
+  const description = `“${truncatedCaption}” — ${reference}`;
+  const title = `${reference} · shared by ${byline}`;
+  return {
+    title,
+    description,
+    openGraph: {
+      title,
+      description,
+      images: [{ url: imageUrl, width: 1200, height: 630, alt: reference }],
+      siteName: "Prabhupāda Says",
+    },
+    twitter: {
+      card: "summary_large_image" as const,
+      title,
+      description,
+      images: [imageUrl],
+    },
+  };
+}