Add followers/following endpoints

Fixes https://gitlab.com/soapbox-pub/ditto/-/issues/69

src/app.ts

@@ -18,6 +18,8 @@ import {
   accountStatusesController,
   createAccountController,
   followController,
+  followersController,
+  followingController,
   relationshipsController,
   updateCredentialsController,
   verifyCredentialsController,
@@ -105,6 +107,8 @@ app.get('/api/v1/accounts/search', accountSearchController);
 app.get('/api/v1/accounts/lookup', accountLookupController);
 app.get('/api/v1/accounts/relationships', relationshipsController);
 app.post('/api/v1/accounts/:pubkey{[0-9a-f]{64}}/follow', followController);
+app.get('/api/v1/accounts/:pubkey{[0-9a-f]{64}}/followers', followersController);
+app.get('/api/v1/accounts/:pubkey{[0-9a-f]{64}}/following', followingController);
 app.get('/api/v1/accounts/:pubkey{[0-9a-f]{64}}/statuses', accountStatusesController);
 app.get('/api/v1/accounts/:pubkey{[0-9a-f]{64}}', accountController);
 

src/controllers/api/accounts.ts

@@ -1,13 +1,14 @@
 import { type AppController } from '@/app.ts';
 import { type Filter, findReplyTag, z } from '@/deps.ts';
 import * as mixer from '@/mixer.ts';
-import { getAuthor, getFollows, syncUser } from '@/queries.ts';
+import { getAuthor, getFollowedPubkeys, getFollows, syncUser } from '@/queries.ts';
 import { booleanParamSchema } from '@/schema.ts';
 import { jsonMetaContentSchema } from '@/schemas/nostr.ts';
 import { toAccount, toRelationship, toStatus } from '@/transformers/nostr-to-mastoapi.ts';
 import { isFollowing, lookupAccount } from '@/utils.ts';
 import { paginated, paginationSchema, parseBody } from '@/utils/web.ts';
 import { createEvent } from '@/utils/web.ts';
+import { renderEventAccounts } from '@/views.ts';
 
 const createAccountController: AppController = (c) => {
   return c.json({ error: 'Please log in with Nostr.' }, 405);
@@ -173,6 +174,25 @@ const followController: AppController = async (c) => {
   return c.json(relationship);
 };
 
+const followersController: AppController = (c) => {
+  const pubkey = c.req.param('pubkey');
+  const params = paginationSchema.parse(c.req.query());
+  return renderEventAccounts(c, [{ kinds: [3], '#p': [pubkey], ...params }]);
+};
+
+const followingController: AppController = async (c) => {
+  const pubkey = c.req.param('pubkey');
+  const pubkeys = await getFollowedPubkeys(pubkey);
+
+  // TODO: pagination by offset.
+  const accounts = await Promise.all(pubkeys.map(async (pubkey) => {
+    const event = await getAuthor(pubkey);
+    return event ? await toAccount(event) : undefined;
+  }));
+
+  return c.json(accounts.filter(Boolean));
+};
+
 export {
   accountController,
   accountLookupController,
@@ -180,6 +200,8 @@ export {
   accountStatusesController,
   createAccountController,
   followController,
+  followersController,
+  followingController,
   relationshipsController,
   updateCredentialsController,
   verifyCredentialsController,

src/controllers/api/statuses.ts

@@ -1,9 +1,9 @@
 import { type AppController } from '@/app.ts';
 import { type Event, ISO6391, z } from '@/deps.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';
+import { getAncestors, getDescendants, getEvent } from '@/queries.ts';
+import { toStatus } from '@/transformers/nostr-to-mastoapi.ts';
+import { createEvent, paginationSchema, parseBody } from '@/utils/web.ts';
+import { renderEventAccounts } from '@/views.ts';
 
 const createStatusSchema = z.object({
   in_reply_to_id: z.string().regex(/[0-9a-f]{64}/).nullish(),
@@ -129,34 +129,16 @@ const favouriteController: AppController = async (c) => {
   }
 };
 
-const favouritedByController: AppController = async (c) => {
+const favouritedByController: AppController = (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 params = paginationSchema.parse(c.req.query());
+  return renderEventAccounts(c, [{ kinds: [7], '#e': [id], ...params }]);
 };
 
-const rebloggedByController: AppController = async (c) => {
+const rebloggedByController: AppController = (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);
+  const params = paginationSchema.parse(c.req.query());
+  return renderEventAccounts(c, [{ kinds: [6], '#e': [id], ...params }]);
 };
 
 export {

src/views.ts

@@ -0,0 +1,27 @@
+import { AppContext } from '@/app.ts';
+import { type Filter } from '@/deps.ts';
+import * as mixer from '@/mixer.ts';
+import { getAuthor } from '@/queries.ts';
+import { toAccount } from '@/transformers/nostr-to-mastoapi.ts';
+import { paginated } from '@/utils/web.ts';
+
+/** Render account objects for the author of each event. */
+async function renderEventAccounts(c: AppContext, filters: Filter[]) {
+  const events = await mixer.getFilters(filters);
+  const pubkeys = new Set(events.map(({ pubkey }) => pubkey));
+
+  if (!pubkeys.size) {
+    return c.json([]);
+  }
+
+  const accounts = await Promise.all([...pubkeys].map(async (pubkey) => {
+    const author = await getAuthor(pubkey);
+    if (author) {
+      return toAccount(author);
+    }
+  }));
+
+  return paginated(c, events, accounts);
+}
+
+export { renderEventAccounts };