diff --git a/src/api/routes/oauth2/authorize.ts b/src/api/routes/oauth2/authorize.ts
new file mode 100644
index 00000000..e4c2e986
--- /dev/null
+++ b/src/api/routes/oauth2/authorize.ts
@@ -0,0 +1,146 @@
+import { Router, Request, Response } from "express";
+import { route } from "@fosscord/api";
+import { ApiError, Application, ApplicationAuthorizeSchema, getPermission, DiscordApiErrors, Member, Permissions, User, getRights, Rights, MemberPrivateProjection } from "@fosscord/util";
+const router = Router();
+
+// TODO: scopes, other oauth types
+
+router.get("/", route({}), async (req: Request, res: Response) => {
+ const {
+ client_id,
+ scope,
+ response_type,
+ redirect_url,
+ } = req.query;
+
+ const app = await Application.findOne({
+ where: {
+ id: client_id as string,
+ },
+ relations: ["bot"],
+ });
+
+ // TODO: use DiscordApiErrors
+ // findOneOrFail throws code 404
+ if (!app) throw DiscordApiErrors.UNKNOWN_APPLICATION;
+ if (!app.bot) throw DiscordApiErrors.OAUTH2_APPLICATION_BOT_ABSENT;
+
+ const bot = app.bot;
+ delete app.bot;
+
+ const user = await User.findOneOrFail({
+ where: {
+ id: req.user_id,
+ bot: false,
+ },
+ select: ["id", "username", "avatar", "discriminator", "public_flags"]
+ });
+
+ const guilds = await Member.find({
+ where: {
+ user: {
+ id: req.user_id,
+ },
+ },
+ relations: ["guild", "roles"],
+ //@ts-ignore
+ select: ["guild.id", "guild.name", "guild.icon", "guild.mfa_level", "guild.owner_id", "roles.id"]
+ });
+
+ const guildsWithPermissions = guilds.map(x => {
+ const perms = x.guild.owner_id === user.id
+ ? new Permissions(Permissions.FLAGS.ADMINISTRATOR)
+ : Permissions.finalPermission({
+ user: {
+ id: user.id,
+ roles: x.roles?.map(x => x.id) || [],
+ },
+ guild: {
+ roles: x?.roles || [],
+ }
+ });
+
+ return {
+ id: x.guild.id,
+ name: x.guild.name,
+ icon: x.guild.icon,
+ mfa_level: x.guild.mfa_level,
+ permissions: perms.bitfield.toString(),
+ };
+ });
+
+ return res.json({
+ guilds: guildsWithPermissions,
+ user: {
+ id: user.id,
+ username: user.username,
+ avatar: user.avatar,
+ avatar_decoration: null, // TODO
+ discriminator: user.discriminator,
+ public_flags: user.public_flags,
+ },
+ application: {
+ id: app.id,
+ name: app.name,
+ icon: app.icon,
+ description: app.description,
+ summary: app.summary,
+ type: app.type,
+ hook: app.hook,
+ guild_id: null, // TODO support guilds
+ bot_public: app.bot_public,
+ bot_require_code_grant: app.bot_require_code_grant,
+ verify_key: app.verify_key,
+ flags: app.flags,
+ },
+ bot: {
+ id: bot.id,
+ username: bot.username,
+ avatar: bot.avatar,
+ avatar_decoration: null, // TODO
+ discriminator: bot.discriminator,
+ public_flags: bot.public_flags,
+ bot: true,
+ approximated_guild_count: 0, // TODO
+ },
+ authorized: false,
+ });
+});
+
+router.post("/", route({ body: "ApplicationAuthorizeSchema" }), async (req: Request, res: Response) => {
+ const body = req.body as ApplicationAuthorizeSchema;
+ const {
+ client_id,
+ scope,
+ response_type,
+ redirect_url
+ } = req.query;
+
+ // TODO: captcha verification
+ // TODO: MFA verification
+
+ const perms = await getPermission(req.user_id, body.guild_id, undefined, { member_relations: ["user"] });
+ // getPermission cache won't exist if we're owner
+ if (Object.keys(perms.cache || {}).length > 0 && perms.cache.member!.user.bot) throw DiscordApiErrors.UNAUTHORIZED;
+ perms.hasThrow("MANAGE_GUILD");
+
+ const app = await Application.findOne({
+ where: {
+ id: client_id as string,
+ },
+ relations: ["bot"],
+ });
+
+ // TODO: use DiscordApiErrors
+ // findOneOrFail throws code 404
+ if (!app) throw new ApiError("Unknown Application", 10002, 404);
+ if (!app.bot) throw new ApiError("OAuth2 application does not have a bot", 50010, 400);
+
+ await Member.addToGuild(app.id, body.guild_id);
+
+ return res.json({
+ location: "/oauth2/authorized", // redirect URL
+ });
+});
+
+export default router;
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