From b27b84e3fb4350fca7b1ee92558d97e2ebb80b9e Mon Sep 17 00:00:00 2001
From: Alex Gleason <alex@alexgleason.me>
Date: Tue, 29 Aug 2023 18:08:00 -0500
Subject: [PATCH] Add favourited_by and reblogged_by controllers

---
 src/app.ts                      |  4 +++
 src/controllers/api/instance.ts |  9 +++++++
 src/controllers/api/statuses.ts | 46 ++++++++++++++++++++++++++++++---
 src/utils/web.ts                |  2 +-
 4 files changed, 56 insertions(+), 5 deletions(-)

diff --git a/src/app.ts b/src/app.ts
index 346831f..73fcb2d 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -35,6 +35,8 @@ import {
   contextController,
   createStatusController,
   favouriteController,
+  favouritedByController,
+  rebloggedByController,
   statusController,
 } from './controllers/api/statuses.ts';
 import { streamingController } from './controllers/api/streaming.ts';
@@ -106,6 +108,8 @@ app.post('/api/v1/accounts/:pubkey{[0-9a-f]{64}}/follow', followController);
 app.get('/api/v1/accounts/:pubkey{[0-9a-f]{64}}/statuses', accountStatusesController);
 app.get('/api/v1/accounts/:pubkey{[0-9a-f]{64}}', accountController);
 
+app.get('/api/v1/statuses/:id{[0-9a-f]{64}}/favourited_by', favouritedByController);
+app.get('/api/v1/statuses/:id{[0-9a-f]{64}}/reblogged_by', rebloggedByController);
 app.get('/api/v1/statuses/:id{[0-9a-f]{64}}/context', contextController);
 app.get('/api/v1/statuses/:id{[0-9a-f]{64}}', statusController);
 app.post('/api/v1/statuses/:id{[0-9a-f]{64}}/favourite', favouriteController);
diff --git a/src/controllers/api/instance.ts b/src/controllers/api/instance.ts
index c28e03b..b30c753 100644
--- a/src/controllers/api/instance.ts
+++ b/src/controllers/api/instance.ts
@@ -30,6 +30,15 @@ const instanceController: AppController = (c) => {
         max_media_attachments: 20,
       },
     },
+    pleroma: {
+      metadata: {
+        features: [
+          'mastodon_api',
+          'mastodon_api_streaming',
+          'exposable_reactions',
+        ],
+      },
+    },
     languages: ['en'],
     stats: {
       domain_count: 0,
diff --git a/src/controllers/api/statuses.ts b/src/controllers/api/statuses.ts
index c7ad80c..9efc4e4 100644
--- a/src/controllers/api/statuses.ts
+++ b/src/controllers/api/statuses.ts
@@ -1,8 +1,9 @@
 import { type AppController } from '@/app.ts';
 import { type Event, ISO6391, z } from '@/deps.ts';
-import { getAncestors, getDescendants, getEvent } from '@/queries.ts';
-import { toStatus } from '@/transformers/nostr-to-mastoapi.ts';
-import { createEvent, parseBody } from '@/utils/web.ts';
+import * as mixer from '@/mixer.ts';
+import { getAncestors, getAuthor, getDescendants, getEvent } from '@/queries.ts';
+import { toAccount, toStatus } from '@/transformers/nostr-to-mastoapi.ts';
+import { createEvent, paginated, parseBody } from '@/utils/web.ts';
 
 const createStatusSchema = z.object({
   in_reply_to_id: z.string().regex(/[0-9a-f]{64}/).nullish(),
@@ -128,4 +129,41 @@ const favouriteController: AppController = async (c) => {
   }
 };
 
-export { contextController, createStatusController, favouriteController, statusController };
+const favouritedByController: AppController = async (c) => {
+  const id = c.req.param('id');
+
+  const events = await mixer.getFilters([{ kinds: [7], '#e': [id] }]);
+
+  const accounts = await Promise.all(events.map(async ({ pubkey }) => {
+    const author = await getAuthor(pubkey);
+    if (author) {
+      return toAccount(author);
+    }
+  }));
+
+  return paginated(c, events, accounts);
+};
+
+const rebloggedByController: AppController = async (c) => {
+  const id = c.req.param('id');
+
+  const events = await mixer.getFilters([{ kinds: [6], '#e': [id] }]);
+
+  const accounts = await Promise.all(events.map(async ({ pubkey }) => {
+    const author = await getAuthor(pubkey);
+    if (author) {
+      return toAccount(author);
+    }
+  }));
+
+  return paginated(c, events, accounts);
+};
+
+export {
+  contextController,
+  createStatusController,
+  favouriteController,
+  favouritedByController,
+  rebloggedByController,
+  statusController,
+};
diff --git a/src/utils/web.ts b/src/utils/web.ts
index 6d89523..5bae5c9 100644
--- a/src/utils/web.ts
+++ b/src/utils/web.ts
@@ -75,7 +75,7 @@ type PaginationParams = z.infer<typeof paginationSchema>;
 
 /** Build HTTP Link header for Mastodon API pagination. */
 function buildLinkHeader(url: string, events: Event[]): string | undefined {
-  if (!events.length) return;
+  if (events.length <= 1) return;
   const firstEvent = events[0];
   const lastEvent = events[events.length - 1];