From fe71f3628cc3f0a171a1dc316866b618e4970e72 Mon Sep 17 00:00:00 2001
From: Jesse Wierzbinski <contact@cpluspatch.com>
Date: Sun, 14 Apr 2024 20:10:18 -1000
Subject: [PATCH] feat(api): :sparkles: Implement /api/v2/instance route

---
 server/api/api/v2/instance/index.test.ts |  32 +++++++
 server/api/api/v2/instance/index.ts      | 113 +++++++++++++++++++++++
 2 files changed, 145 insertions(+)
 create mode 100644 server/api/api/v2/instance/index.test.ts
 create mode 100644 server/api/api/v2/instance/index.ts

diff --git a/server/api/api/v2/instance/index.test.ts b/server/api/api/v2/instance/index.test.ts
new file mode 100644
index 00000000..1435d296
--- /dev/null
+++ b/server/api/api/v2/instance/index.test.ts
@@ -0,0 +1,32 @@
+import { describe, expect, test } from "bun:test";
+import { meta } from "./index";
+import { sendTestRequest } from "~tests/utils";
+import { config } from "config-manager";
+
+// /api/v2/instance
+describe(meta.route, () => {
+    test("should return instance information", async () => {
+        const response = await sendTestRequest(
+            new Request(new URL(meta.route, config.http.base_url)),
+        );
+
+        expect(response.status).toBe(200);
+
+        const json = await response.json();
+        expect(json).toBeObject();
+        expect(json).toContainKeys([
+            "domain",
+            "title",
+            "version",
+            "source_url",
+            "description",
+            "usage",
+            "thumbnail",
+            "languages",
+            "configuration",
+            "registrations",
+            "contact",
+            "rules",
+        ]);
+    });
+});
diff --git a/server/api/api/v2/instance/index.ts b/server/api/api/v2/instance/index.ts
new file mode 100644
index 00000000..7dbd02d2
--- /dev/null
+++ b/server/api/api/v2/instance/index.ts
@@ -0,0 +1,113 @@
+import { apiRoute, applyConfig } from "@api";
+import { jsonResponse } from "@response";
+import { and, count, countDistinct, eq, gte, isNull } from "drizzle-orm";
+import { findFirstUser, userToAPI } from "~database/entities/User";
+import { db } from "~drizzle/db";
+import { instance, status, user } from "~drizzle/schema";
+import manifest from "~package.json";
+import type { Instance as APIInstance } from "~types/mastodon/instance";
+
+export const meta = applyConfig({
+    allowedMethods: ["GET"],
+    route: "/api/v2/instance",
+    ratelimits: {
+        max: 300,
+        duration: 60,
+    },
+    auth: {
+        required: false,
+    },
+});
+
+export default apiRoute(async (req, matchedRoute, extraData) => {
+    const config = await extraData.configManager.getConfig();
+
+    // Get software version from package.json
+    const version = manifest.version;
+    const contactAccount = await findFirstUser({
+        where: (user, { isNull, eq, and }) =>
+            and(isNull(user.instanceId), eq(user.isAdmin, true)),
+        orderBy: (user, { asc }) => asc(user.id),
+    });
+
+    const monthlyActiveUsers = (
+        await db
+            .select({
+                count: countDistinct(user),
+            })
+            .from(user)
+            .leftJoin(status, eq(user.id, status.authorId))
+            .where(
+                and(
+                    isNull(user.instanceId),
+                    gte(
+                        status.createdAt,
+                        new Date(
+                            Date.now() - 30 * 24 * 60 * 60 * 1000,
+                        ).toISOString(),
+                    ),
+                ),
+            )
+    )[0].count;
+
+    // TODO: fill in more values
+    return jsonResponse({
+        domain: new URL(config.http.base_url).hostname,
+        title: config.instance.name,
+        version: `4.3.0+glitch (compatible; Lysand ${version}})`,
+        source_url: "https://github.com/lysand-org/lysand",
+        description: config.instance.description,
+        usage: {
+            users: {
+                active_month: monthlyActiveUsers,
+            },
+        },
+        thumbnail: {
+            url: config.instance.logo,
+        },
+        languages: ["en"],
+        configuration: {
+            urls: {
+                streaming: null,
+                status: null,
+            },
+            accounts: {
+                max_featured_tags: 100,
+            },
+            statuses: {
+                max_characters: config.validation.max_note_size,
+                max_media_attachments: config.validation.max_media_attachments,
+                characters_reserved_per_url: 0,
+            },
+            media_attachments: {
+                supported_mime_types: config.validation.allowed_mime_types,
+                image_size_limit: config.validation.max_media_size,
+                image_matrix_limit: config.validation.max_media_size,
+                video_size_limit: config.validation.max_media_size,
+                video_frame_rate_limit: config.validation.max_media_size,
+                video_matrix_limit: config.validation.max_media_size,
+            },
+            polls: {
+                max_characters_per_option:
+                    config.validation.max_poll_option_size,
+                max_expiration: config.validation.max_poll_duration,
+                max_options: config.validation.max_poll_options,
+                min_expiration: config.validation.min_poll_duration,
+            },
+            translation: {
+                enabled: false,
+            },
+        },
+        registrations: {
+            enabled: config.signups.registration,
+            approval_required: false,
+            message: null,
+            url: null,
+        },
+        contact: {
+            email: contactAccount?.email || null,
+            account: contactAccount ? userToAPI(contactAccount) : null,
+        },
+        rules: [],
+    });
+});