Add full OpenID connect provider support

2025-12-06 16:38:19 +01:00 · 2023-12-06 12:10:22 -10:00 · 2023-12-06 12:10:22 -10:00 · 947c1f4991
parent 14d96ac9e6
commit 947c1f4991
47 changed files with 604 additions and 247 deletions
--- a/bun.lockb
+++ b/bun.lockb
--- a/cli.ts
+++ b/cli.ts
@ -73,6 +73,19 @@ ${chalk.bold("Commands:")}
            ${chalk.bold("Example:")} ${chalk.bgGray(
 				`bun cli user search admin`
 			)}
+        ${alignDots(
+			chalk.blue("connect-openid")
+		)} Connect an OpenID account to a local account
+            ${alignDotsSmall(
+				chalk.green("username")
+			)} Username of the local account
+            ${alignDotsSmall(chalk.green("issuerId"))} ID of the OpenID issuer
+            ${alignDotsSmall(
+				chalk.green("serverId")
+			)} ID of the user on the OpenID server
+            ${chalk.bold("Example:")} ${chalk.bgGray(
+				`bun cli user connect-openid admin google 123456789`
+			)}
    ${alignDots(chalk.blue("note"), 24)} Manage notes
        ${alignDots(chalk.blue("delete"))} Delete a note
            ${alignDotsSmall(chalk.green("id"))} ID of the note
@ -403,6 +416,62 @@ switch (command) {

 				break;
 			}
+			case "connect-openid": {
+				const username = args[4];
+				const issuerId = args[5];
+				const serverId = args[6];
+
+				if (!username || !issuerId || !serverId) {
+					console.log(
+						`${chalk.red(`✗`)} Missing username, issuer or ID`
+					);
+					process.exit(1);
+				}
+
+				const user = await client.user.findFirst({
+					where: {
+						username: username,
+					},
+				});
+
+				if (!user) {
+					console.log(`${chalk.red(`✗`)} User not found`);
+					process.exit(1);
+				}
+
+				const issuer = config.oidc.providers.find(
+					p => p.id === issuerId
+				);
+
+				if (!issuer) {
+					console.log(`${chalk.red(`✗`)} Issuer not found`);
+					process.exit(1);
+				}
+
+				await client.user.update({
+					where: {
+						id: user.id,
+					},
+					data: {
+						linkedOpenIdAccounts: {
+							create: {
+								issuerId: issuerId,
+								serverId: serverId,
+							},
+						},
+					},
+				});
+
+				console.log(
+					`${chalk.green(
+						`✓`
+					)} Connected OpenID account to user ${chalk.blue(
+						user.username
+					)}`
+				);
+
+				break;
+			}
 			default:
 				console.log(`Unknown command ${chalk.blue(command)}`);
 				break;
--- a/config/config.example.toml
+++ b/config/config.example.toml
@ -24,6 +24,18 @@ port = 40007
 api_key = ""
 enabled = true

+# Delete this section if you don't want to use custom OAuth providers
+# This is an example configuration
+# The provider MUST support OpenID Connect with .well-known discovery
+# Most notably, GitHub does not support this
+[[oidc.providers]]
+name = "CPlusPatch ID"
+id = "cpluspatch-id"
+url = "https://id.cpluspatch.com/application/o/lysand-testing/"
+client_id = "XXXXXXXXXXXXXXXX"
+client_secret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+icon = "https://cpluspatch.com/images/icons/logo.svg"
+
 [http]
 base_url = "https://lysand.social"
 bind = "http://localhost"
--- a/package.json
+++ b/package.json
@ -38,7 +38,7 @@
    "migrate-dev": "bun prisma migrate dev",
    "migrate": "bun prisma migrate deploy",
    "lint": "eslint --config .eslintrc.cjs --ext .ts .",
-    "prisma": "bun run prisma.ts",
+    "prisma": "DATABASE_URL=$(bun run prisma.ts) bunx prisma",
    "generate": "bun prisma generate",
    "benchmark:timeline": "bun run benchmarks/timelines.ts",
    "cloc": "cloc . --exclude-dir node_modules",
@ -94,11 +94,13 @@
    "linkifyjs": "^4.1.3",
    "marked": "^9.1.2",
    "meilisearch": "^0.36.0",
+    "oauth4webapi": "^2.4.0",
    "prisma": "^5.6.0",
    "prisma-redis-middleware": "^4.8.0",
    "semver": "^7.5.4",
    "sharp": "^0.33.0-rc.2",
    "vite": "^5.0.4",
+    "vite-ssr": "^0.17.1",
    "vue": "^3.3.9",
    "vue-router": "^4.2.5",
    "vue-tsc": "^1.8.24"
--- a/pages/App.vue
+++ b/pages/App.vue
@ -1,6 +1,6 @@
 <script setup>
 // Import Tailwind style reset
-import '@unocss/reset/tailwind.css'
+import '@unocss/reset/tailwind-compat.css'
 </script>

 <template>
--- a/pages/components/LoginInput.vue
+++ b/pages/components/LoginInput.vue
@ -0,0 +1,29 @@
+<template>
+    <div class="flex items-center justify-between">
+        <label for="password" class="block text-sm font-medium leading-6 text-gray-900">{{ label }}</label>
+    </div>
+    <div class="mt-2">
+        <input v-bind="$attrs" @input="checkValid" :class="['block w-full rounded-md border-0 py-1.5 text-gray-900 shadow-sm ring-1 ring-inset ring-gray-300 placeholder:text-gray-400 focus:ring-2 focus:ring-inset focus:ring-indigo-600 sm:text-sm sm:leading-6',
+            isInvalid && 'invalid:!ring-red-600 invalid:ring-2']">
+        <span v-if="isInvalid" class="mt-1 text-xs text-red-600">{{ label }} is invalid</span>
+    </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue';
+
+const props = defineProps<{
+    label: string;
+}>();
+
+const isInvalid = ref(false);
+
+const checkValid = (e: Event) => {
+    const target = e.target as HTMLInputElement;
+    if (target.checkValidity()) {
+        isInvalid.value = false;
+    } else {
+        isInvalid.value = true;
+    }
+}
+</script>
--- a/pages/login.vue
+++ b/pages/login.vue
@ -1,28 +1,43 @@
 <template>
-    <div class="flex min-h-screen flex-col justify-center px-6 py-12 lg:px-8">
+	<div class="flex min-h-screen flex-col justify-center px-6 py-12 lg:px-8">
 		<div class="mt-10 sm:mx-auto sm:w-full sm:max-w-sm">
-			<form class="space-y-6" method="POST" :action="`/auth/login?redirect_uri=${redirect_uri}&response_type=${response_type}&client_id=${client_id}&scope=${scope}`">
+			<form class="space-y-6" method="POST"
+				:action="`/auth/login?redirect_uri=${redirect_uri}&response_type=${response_type}&client_id=${client_id}&scope=${scope}`">
 				<div>
-					<label for="email" class="block text-sm font-medium leading-6 text-gray-900">Email address</label>
-					<div class="mt-2">
-						<input id="email" name="email" type="email" autocomplete="email" required
-							class="block w-full rounded-md border-0 py-1.5 text-gray-900 shadow-sm ring-1 ring-inset ring-gray-300 placeholder:text-gray-400 focus:ring-2 focus:ring-inset focus:ring-indigo-600 sm:text-sm sm:leading-6">
-					</div>
+					<h1 class="font-bold text-2xl text-center tracking-tight">Login to your account</h1>
+				</div>
+
+				<div v-if="error && error !== 'undefined'" class="rounded bg-purple-100 ring-1 ring-purple-800 py-2 px-4">
+					<h3 class="font-bold">An error occured:</h3>
+					<p>{{ error }}</p>
 				</div>

 				<div>
-					<div class="flex items-center justify-between">
-						<label for="password" class="block text-sm font-medium leading-6 text-gray-900">Password</label>
-					</div>
-					<div class="mt-2">
-						<input id="password" name="password" type="password" autocomplete="current-password" required
-							class="block w-full rounded-md border-0 py-1.5 text-gray-900 shadow-sm ring-1 ring-inset ring-gray-300 placeholder:text-gray-400 focus:ring-2 focus:ring-inset focus:ring-indigo-600 sm:text-sm sm:leading-6">
+					<LoginInput label="Email" id="email" name="email" type="email" autocomplete="email" required />
+				</div>
+
+				<div>
+					<LoginInput label="Password" id="password" name="password" type="password"
+						autocomplete="current-password" required />
+				</div>
+
+				<div v-if="oauthProviders && oauthProviders.length > 0" class="w-full flex flex-col gap-3">
+					<h2 class="text-sm text-gray-700">Or sign in with</h2>
+					<div class="grid grid-cols-1 gap-4 w-full">
+						<a v-for="provider of oauthProviders" :key="provider.id"
+							:href="`/oauth/authorize-external?issuer=${provider.id}&redirect_uri=${redirect_uri}&response_type=${response_type}&clientId=${client_id}&scope=${scope}`"
+							class="flex flex-row rounded ring-1 gap-2 p-2 ring-black/10 hover:shadow duration-200">
+							<img :src="provider.icon" :alt="provider.name" class="w-8 h-8" />
+							<div class="flex flex-col gap-0 justify-center">
+								<h3 class="font-bold">{{ provider.name }}</h3>
+							</div>
+						</a>
 					</div>
 				</div>

 				<div>
 					<button type="submit"
-						class="flex w-full justify-center rounded-md !bg-indigo-600 px-3 py-1.5 text-sm font-semibold leading-6 text-white shadow-sm hover:!bg-indigo-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600">Sign
+						class="flex w-full justify-center rounded-md bg-purple-600 px-3 py-1.5 text-sm font-semibold leading-6 text-white shadow-sm hover:shadow-lg duration-200 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600">Sign
 						in</button>
 				</div>
 			</form>
@ -32,6 +47,8 @@

 <script setup lang="ts">
 import { useRoute } from 'vue-router';
+import LoginInput from "./components/LoginInput.vue"
+import { onMounted, ref } from 'vue';

 const query = useRoute().query;

@ -39,4 +56,20 @@ const redirect_uri = query.redirect_uri;
 const response_type = query.response_type;
 const client_id = query.client_id;
 const scope = query.scope;
+const error = decodeURIComponent(query.error as string);
+
+const oauthProviders = ref<{
+	name: string;
+	icon: string;
+	id: string
+}[] | null>(null);
+
+const getOauthProviders = async () => {
+	const response = await fetch('/oauth/providers');
+	return await response.json() as any;
+}
+
+onMounted(async () => {
+	oauthProviders.value = await getOauthProviders();
+})
 </script>
--- a/pages/main.ts
+++ b/pages/main.ts
@ -1,5 +1,6 @@
 import { createApp } from "vue";
 import "./style.css";
+import "virtual:uno.css";
 import { createRouter, createWebHistory } from "vue-router";
 import Login from "./login.vue";
 import App from "./App.vue";
@ -8,7 +9,7 @@ const Home = { template: "<div>Home</div>" };

 const routes = [
 	{ path: "/", component: Home },
-	{ path: "/oauth/login", component: Login },
+	{ path: "/oauth/authorize", component: Login },
 ];

 const router = createRouter({
--- a/pages/uno.css
+++ b/pages/uno.css
@ -1,155 +0,0 @@
-/* layer: preflights */
-*,::before,::after{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-pan-x: ;--un-pan-y: ;--un-pinch-zoom: ;--un-scroll-snap-strictness:proximity;--un-ordinal: ;--un-slashed-zero: ;--un-numeric-figure: ;--un-numeric-spacing: ;--un-numeric-fraction: ;--un-border-spacing-x:0;--un-border-spacing-y:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);--un-blur: ;--un-brightness: ;--un-contrast: ;--un-drop-shadow: ;--un-grayscale: ;--un-hue-rotate: ;--un-invert: ;--un-saturate: ;--un-sepia: ;--un-backdrop-blur: ;--un-backdrop-brightness: ;--un-backdrop-contrast: ;--un-backdrop-grayscale: ;--un-backdrop-hue-rotate: ;--un-backdrop-invert: ;--un-backdrop-opacity: ;--un-backdrop-saturate: ;--un-backdrop-sepia: ;}::backdrop{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-pan-x: ;--un-pan-y: ;--un-pinch-zoom: ;--un-scroll-snap-strictness:proximity;--un-ordinal: ;--un-slashed-zero: ;--un-numeric-figure: ;--un-numeric-spacing: ;--un-numeric-fraction: ;--un-border-spacing-x:0;--un-border-spacing-y:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);--un-blur: ;--un-brightness: ;--un-contrast: ;--un-drop-shadow: ;--un-grayscale: ;--un-hue-rotate: ;--un-invert: ;--un-saturate: ;--un-sepia: ;--un-backdrop-blur: ;--un-backdrop-brightness: ;--un-backdrop-contrast: ;--un-backdrop-grayscale: ;--un-backdrop-hue-rotate: ;--un-backdrop-invert: ;--un-backdrop-opacity: ;--un-backdrop-saturate: ;--un-backdrop-sepia: ;}
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-padding-bottom: 0.5rem;
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--un-shadow: 0 0 #0000; }
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-padding-right: 0.75rem;
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-[type='checkbox']:indeterminate:hover, [type='checkbox']:indeterminate:focus { border-color: transparent;
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-[type='file']:focus { outline: 1px solid ButtonText , 1px auto -webkit-focus-ring-color; }
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-.tab{-moz-tab-size:4;-o-tab-size:4;tab-size:4;}
-.shadow-sm{--un-shadow:var(--un-shadow-inset) 0 1px 2px 0 var(--un-shadow-color, rgba(0,0,0,0.05));box-shadow:var(--un-ring-offset-shadow), var(--un-ring-shadow), var(--un-shadow);}
-.focus-visible\:outline-2:focus-visible{outline-width:2px;}
-.focus-visible\:outline-indigo-600:focus-visible{--un-outline-color-opacity:1;outline-color:rgba(79,70,229,var(--un-outline-color-opacity));}
-.focus-visible\:outline-offset-2:focus-visible{outline-offset:2px;}
-.outline{outline-style:solid;}
-.focus-visible\:outline:focus-visible{outline-style:solid;}
-.ring-1{--un-ring-width:1px;--un-ring-offset-shadow:var(--un-ring-inset) 0 0 0 var(--un-ring-offset-width) var(--un-ring-offset-color);--un-ring-shadow:var(--un-ring-inset) 0 0 0 calc(var(--un-ring-width) + var(--un-ring-offset-width)) var(--un-ring-color);box-shadow:var(--un-ring-offset-shadow), var(--un-ring-shadow), var(--un-shadow);}
-.focus\:ring-2:focus{--un-ring-width:2px;--un-ring-offset-shadow:var(--un-ring-inset) 0 0 0 var(--un-ring-offset-width) var(--un-ring-offset-color);--un-ring-shadow:var(--un-ring-inset) 0 0 0 calc(var(--un-ring-width) + var(--un-ring-offset-width)) var(--un-ring-color);box-shadow:var(--un-ring-offset-shadow), var(--un-ring-shadow), var(--un-shadow);}
-.ring-gray-300{--un-ring-opacity:1;--un-ring-color:rgba(209,213,219,var(--un-ring-opacity));}
-.focus\:ring-indigo-600:focus{--un-ring-opacity:1;--un-ring-color:rgba(79,70,229,var(--un-ring-opacity));}
-.ring-inset{--un-ring-inset:inset;}
-.focus\:ring-inset:focus{--un-ring-inset:inset;}
-@media (min-width: 640px){
-.sm\:mx-auto{margin-left:auto;margin-right:auto;}
-.sm\:max-w-sm{max-width:24rem;}
-.sm\:w-full{width:100%;}
-.sm\:text-sm{font-size:0.875rem;line-height:1.25rem;}
-.sm\:leading-6{line-height:1.5rem;}
-}
-@media (min-width: 1024px){
-.lg\:px-8{padding-left:2rem;padding-right:2rem;}
-}
--- a/pages/vite.config.ts
+++ b/pages/vite.config.ts
@ -23,7 +23,7 @@ export default defineConfig({
 	},
 	plugins: [
 		UnoCSS({
-			mode: "vue-scoped",
+			mode: "global",
 		}),
 		vue(),
 	],
--- a/prisma.ts
+++ b/prisma.ts
@ -2,16 +2,8 @@

 import { getConfig } from "@config";

-const args = process.argv.slice(2);
 const config = getConfig();

-const { stdout } = Bun.spawn(["bunx", "prisma", ...args], {
-	env: {
-		...process.env,
-		DATABASE_URL: `postgresql://${config.database.username}:${config.database.password}@${config.database.host}:${config.database.port}/${config.database.database}`,
-	},
-});
-
-// Show stdout
-const text = await new Response(stdout).text();
-console.log(text);
+process.stdout.write(
+	`postgresql://${config.database.username}:${config.database.password}@${config.database.host}:${config.database.port}/${config.database.database}`
+);
--- a/prisma/migrations/20231206215508_add_openid/migration.sql
+++ b/prisma/migrations/20231206215508_add_openid/migration.sql
@ -0,0 +1,20 @@
+-- CreateTable
+CREATE TABLE "OpenIdLoginFlow" (
+    "id" UUID NOT NULL DEFAULT uuid_generate_v7(),
+    "codeVerifier" TEXT NOT NULL,
+
+    CONSTRAINT "OpenIdLoginFlow_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "OpenIdAccount" (
+    "id" UUID NOT NULL DEFAULT uuid_generate_v7(),
+    "userId" UUID,
+    "serverId" TEXT NOT NULL,
+    "issuerId" TEXT NOT NULL,
+
+    CONSTRAINT "OpenIdAccount_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "OpenIdAccount" ADD CONSTRAINT "OpenIdAccount_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@ -139,6 +139,11 @@ model Token {
  applicationId String?      @db.Uuid
 }

+model OpenIdLoginFlow {
+  id           String @id @default(dbgenerated("uuid_generate_v7()")) @db.Uuid
+  codeVerifier String
+}
+
 model Attachment {
  id            String  @id @default(dbgenerated("uuid_generate_v7()")) @db.Uuid
  url           String
@ -170,36 +175,45 @@ model Notification {
 }

 model User {
-  id                   String         @id @default(dbgenerated("uuid_generate_v7()")) @db.Uuid
-  uri                  String         @unique
-  username             String         @unique
+  id                   String          @id @default(dbgenerated("uuid_generate_v7()")) @db.Uuid
+  uri                  String          @unique
+  username             String          @unique
  displayName          String
  password             String? // Nullable
-  email                String?        @unique // Nullable
-  note                 String         @default("")
-  isAdmin              Boolean        @default(false)
+  email                String?         @unique // Nullable
+  note                 String          @default("")
+  isAdmin              Boolean         @default(false)
  endpoints            Json? // Nullable
  source               Json
  avatar               String
  header               String
-  createdAt            DateTime       @default(now())
-  updatedAt            DateTime       @updatedAt
-  isBot                Boolean        @default(false)
-  isLocked             Boolean        @default(false)
-  isDiscoverable       Boolean        @default(false)
-  sanctions            String[]       @default([])
+  createdAt            DateTime        @default(now())
+  updatedAt            DateTime        @updatedAt
+  isBot                Boolean         @default(false)
+  isLocked             Boolean         @default(false)
+  isDiscoverable       Boolean         @default(false)
+  sanctions            String[]        @default([])
  publicKey            String
  privateKey           String? // Nullable
-  relationships        Relationship[] @relation("OwnerToRelationship") // One to many relation with Relationship
-  relationshipSubjects Relationship[] @relation("SubjectToRelationship") // One to many relation with Relationship
-  instance             Instance?      @relation(fields: [instanceId], references: [id], onDelete: Cascade) // Many to one relation with Instance
-  instanceId           String?        @db.Uuid
-  pinnedNotes          Status[]       @relation("UserPinnedNotes") // Many to many relation with Status
+  relationships        Relationship[]  @relation("OwnerToRelationship") // One to many relation with Relationship
+  relationshipSubjects Relationship[]  @relation("SubjectToRelationship") // One to many relation with Relationship
+  instance             Instance?       @relation(fields: [instanceId], references: [id], onDelete: Cascade) // Many to one relation with Instance
+  instanceId           String?         @db.Uuid
+  pinnedNotes          Status[]        @relation("UserPinnedNotes") // Many to many relation with Status
  emojis               Emoji[] // Many to many relation with Emoji
-  statuses             Status[]       @relation("UserStatuses") // One to many relation with Status
+  statuses             Status[]        @relation("UserStatuses") // One to many relation with Status
  tokens               Token[] // One to many relation with Token
-  likes                Like[]         @relation("UserLiked") // One to many relation with Like
+  likes                Like[]          @relation("UserLiked") // One to many relation with Like
  statusesMentioned    Status[] // Many to many relation with Status
  notifications        Notification[] // One to many relation with Notification
-  notified             Notification[] @relation("NotificationToNotified") // One to many relation with Notification
+  notified             Notification[]  @relation("NotificationToNotified") // One to many relation with Notification
+  linkedOpenIdAccounts OpenIdAccount[] // One to many relation with OpenIdAccount
+}
+
+model OpenIdAccount {
+  id       String  @id @default(dbgenerated("uuid_generate_v7()")) @db.Uuid
+  User     User?   @relation(fields: [userId], references: [id])
+  userId   String? @db.Uuid
+  serverId String // ID on the authorization server
+  issuerId String
 }
--- a/server/api/auth/login/index.ts
+++ b/server/api/auth/login/index.ts
@ -1,5 +1,4 @@
 import { applyConfig } from "@api";
-import { errorResponse } from "@response";
 import type { MatchedRoute } from "bun";
 import { randomBytes } from "crypto";
 import { client } from "~database/datasource";
@ -38,11 +37,21 @@ export default async (
 	const email = formData.get("email")?.toString() || null;
 	const password = formData.get("password")?.toString() || null;

+	const redirectToLogin = (error: string) =>
+		Response.redirect(
+			`/oauth/authorize?` +
+				new URLSearchParams({
+					...matchedRoute.query,
+					error: encodeURIComponent(error),
+				}).toString(),
+			302
+		);
+
 	if (response_type !== "code")
-		return errorResponse("Invalid response type (try 'code')", 400);
+		return redirectToLogin("Invalid response_type");

 	if (!email || !password)
-		return errorResponse("Missing username or password", 400);
+		return redirectToLogin("Invalid username or password");

 	// Get user
 	const user = await client.user.findFirst({
@ -53,7 +62,7 @@ export default async (
 	});

 	if (!user || !(await Bun.password.verify(password, user.password || "")))
-		return errorResponse("Invalid username or password", 401);
+		return redirectToLogin("Invalid username or password");

 	// Get application
 	const application = await client.application.findFirst({
@ -62,7 +71,7 @@ export default async (
 		},
 	});

-	if (!application) return errorResponse("Invalid client_id", 404);
+	if (!application) return redirectToLogin("Invalid client_id");

 	const code = randomBytes(32).toString("hex");

--- a/server/api/oauth/authorize-external/index.ts
+++ b/server/api/oauth/authorize-external/index.ts
@ -0,0 +1,84 @@
+import { applyConfig } from "@api";
+import { getConfig } from "@config";
+import { oauthRedirectUri } from "@constants";
+import type { MatchedRoute } from "bun";
+import {
+	calculatePKCECodeChallenge,
+	discoveryRequest,
+	processDiscoveryResponse,
+} from "oauth4webapi";
+
+export const meta = applyConfig({
+	allowedMethods: ["GET"],
+	auth: {
+		required: false,
+	},
+	ratelimits: {
+		duration: 60,
+		max: 20,
+	},
+	route: "/oauth/authorize-external",
+});
+
+/**
+ * Redirects the user to the external OAuth provider
+ */
+export default async (
+	req: Request,
+	matchedRoute: MatchedRoute
+	// eslint-disable-next-line @typescript-eslint/require-await
+): Promise<Response> => {
+	const redirectToLogin = (error: string) =>
+		Response.redirect(
+			`/oauth/authorize?` +
+				new URLSearchParams({
+					...matchedRoute.query,
+					error: encodeURIComponent(error),
+				}).toString(),
+			302
+		);
+
+	const issuerId = matchedRoute.query.issuer;
+
+	// This is the Lysand client's client_id, not the external OAuth provider's client_id
+	const clientId = matchedRoute.query.clientId;
+
+	if (!clientId || clientId === "undefined") {
+		return redirectToLogin("Missing client_id");
+	}
+
+	const config = getConfig();
+
+	const issuer = config.oidc.providers.find(
+		provider => provider.id === issuerId
+	);
+
+	if (!issuer) {
+		return redirectToLogin("Invalid issuer");
+	}
+
+	const issuerUrl = new URL(issuer.url);
+
+	const authServer = await discoveryRequest(issuerUrl, {
+		algorithm: "oidc",
+	}).then(res => processDiscoveryResponse(issuerUrl, res));
+
+	const codeVerifier = "tempString";
+	const codeChallenge = await calculatePKCECodeChallenge(codeVerifier);
+
+	return Response.redirect(
+		authServer.authorization_endpoint +
+			"?" +
+			new URLSearchParams({
+				client_id: issuer.client_id,
+				redirect_uri:
+					oauthRedirectUri(issuerId) + `?clientId=${clientId}`,
+				response_type: "code",
+				scope: "openid profile email",
+				// PKCE
+				code_challenge_method: "S256",
+				code_challenge: codeChallenge,
+			}).toString(),
+		302
+	);
+};
--- a/server/api/oauth/authorize/index.ts
+++ b/server/api/oauth/authorize/index.ts
@ -1,38 +0,0 @@
-import { applyConfig } from "@api";
-import type { MatchedRoute } from "bun";
-
-export const meta = applyConfig({
-	allowedMethods: ["GET"],
-	auth: {
-		required: false,
-	},
-	ratelimits: {
-		duration: 60,
-		max: 20,
-	},
-	route: "/oauth/authorize",
-});
-
-/**
- * Returns an HTML login form
- */
-export default async (
-	req: Request,
-	matchedRoute: MatchedRoute
-): Promise<Response> => {
-	const html = Bun.file("./pages/login.html");
-	const css = Bun.file("./pages/uno.css");
-	return new Response(
-		(await html.text())
-			.replace(
-				"{{URL}}",
-				`/auth/login?redirect_uri=${matchedRoute.query.redirect_uri}&response_type=${matchedRoute.query.response_type}&client_id=${matchedRoute.query.client_id}&scope=${matchedRoute.query.scope}`
-			)
-			.replace("{{STYLES}}", `<style>${await css.text()}</style>`),
-		{
-			headers: {
-				"Content-Type": "text/html",
-			},
-		}
-	);
-};
--- a/server/api/oauth/callback/[issuer]/index.ts
+++ b/server/api/oauth/callback/[issuer]/index.ts
@ -0,0 +1,187 @@
+import { applyConfig } from "@api";
+import { getConfig } from "@config";
+import { oauthRedirectUri } from "@constants";
+import type { MatchedRoute } from "bun";
+import { randomBytes } from "crypto";
+import {
+	authorizationCodeGrantRequest,
+	discoveryRequest,
+	expectNoState,
+	isOAuth2Error,
+	processDiscoveryResponse,
+	validateAuthResponse,
+	userInfoRequest,
+	processAuthorizationCodeOpenIDResponse,
+	processUserInfoResponse,
+	getValidatedIdTokenClaims,
+} from "oauth4webapi";
+import { client } from "~database/datasource";
+import { TokenType } from "~database/entities/Token";
+
+export const meta = applyConfig({
+	allowedMethods: ["GET"],
+	auth: {
+		required: false,
+	},
+	ratelimits: {
+		duration: 60,
+		max: 20,
+	},
+	route: "/oauth/callback/:issuer",
+});
+
+/**
+ * Redirects the user to the external OAuth provider
+ */
+export default async (
+	req: Request,
+	matchedRoute: MatchedRoute
+): Promise<Response> => {
+	const redirectToLogin = (error: string) =>
+		Response.redirect(
+			`/oauth/authorize?` +
+				new URLSearchParams({
+					client_id: matchedRoute.query.clientId,
+					error: encodeURIComponent(error),
+				}).toString(),
+			302
+		);
+
+	const currentUrl = new URL(req.url);
+
+	// Remove state query parameter from URL
+	currentUrl.searchParams.delete("state");
+	const issuerParam = matchedRoute.params.issuer;
+	// This is the Lysand client's client_id, not the external OAuth provider's client_id
+	const clientId = matchedRoute.query.clientId;
+
+	const config = getConfig();
+
+	const issuer = config.oidc.providers.find(
+		provider => provider.id === issuerParam
+	);
+
+	if (!issuer) {
+		return redirectToLogin("Invalid issuer");
+	}
+
+	const issuerUrl = new URL(issuer.url);
+
+	const authServer = await discoveryRequest(issuerUrl, {
+		algorithm: "oidc",
+	}).then(res => processDiscoveryResponse(issuerUrl, res));
+
+	const parameters = validateAuthResponse(
+		authServer,
+		{
+			client_id: issuer.client_id,
+			client_secret: issuer.client_secret,
+		},
+		currentUrl,
+		// Whether to expect state or not
+		expectNoState
+	);
+
+	if (isOAuth2Error(parameters)) {
+		return redirectToLogin(
+			parameters.error_description || parameters.error
+		);
+	}
+
+	const response = await authorizationCodeGrantRequest(
+		authServer,
+		{
+			client_id: issuer.client_id,
+			client_secret: issuer.client_secret,
+		},
+		parameters,
+		oauthRedirectUri(issuerParam) + `?clientId=${clientId}`,
+		"tempString"
+	);
+
+	const result = await processAuthorizationCodeOpenIDResponse(
+		authServer,
+		{
+			client_id: issuer.client_id,
+			client_secret: issuer.client_secret,
+		},
+		response
+	);
+
+	if (isOAuth2Error(result)) {
+		return redirectToLogin(result.error_description || result.error);
+	}
+
+	const { access_token } = result;
+
+	const claims = getValidatedIdTokenClaims(result);
+	const { sub } = claims;
+
+	// Validate `sub`
+	// Later, we'll use this to automatically set the user's data
+	await userInfoRequest(
+		authServer,
+		{
+			client_id: issuer.client_id,
+			client_secret: issuer.client_secret,
+		},
+		access_token
+	).then(res =>
+		processUserInfoResponse(
+			authServer,
+			{
+				client_id: issuer.client_id,
+				client_secret: issuer.client_secret,
+			},
+			sub,
+			res
+		)
+	);
+
+	const user = await client.user.findFirst({
+		where: {
+			linkedOpenIdAccounts: {
+				some: {
+					serverId: sub,
+					issuerId: issuer.id,
+				},
+			},
+		},
+	});
+
+	if (!user) {
+		return redirectToLogin("No user found with that account");
+	}
+
+	const application = await client.application.findFirst({
+		where: {
+			client_id: clientId,
+		},
+	});
+
+	if (!application) return redirectToLogin("Invalid client_id");
+
+	const code = randomBytes(32).toString("hex");
+
+	await client.application.update({
+		where: { id: application.id },
+		data: {
+			tokens: {
+				create: {
+					access_token: randomBytes(64).toString("base64url"),
+					code: code,
+					scope: application.scopes,
+					token_type: TokenType.BEARER,
+					user: {
+						connect: {
+							id: user.id,
+						},
+					},
+				},
+			},
+		},
+	});
+
+	// Redirect back to application
+	return Response.redirect(`${application.redirect_uris}?code=${code}`, 302);
+};
--- a/server/api/oauth/providers/index.ts
+++ b/server/api/oauth/providers/index.ts
@ -0,0 +1,31 @@
+import { applyConfig } from "@api";
+import { getConfig } from "@config";
+import { jsonResponse } from "@response";
+
+export const meta = applyConfig({
+	allowedMethods: ["GET"],
+	auth: {
+		required: false,
+	},
+	ratelimits: {
+		duration: 60,
+		max: 10,
+	},
+	route: "/oauth/providers",
+});
+
+/**
+ * Lists available OAuth providers
+ */
+// eslint-disable-next-line @typescript-eslint/require-await
+export default async (): Promise<Response> => {
+	const config = getConfig();
+
+	return jsonResponse(
+		config.oidc.providers.map(p => ({
+			name: p.name,
+			icon: p.icon,
+			id: p.id,
+		}))
+	);
+};
--- a/temp/flow_0exywktgkcq6wjwa691mat
+++ b/temp/flow_0exywktgkcq6wjwa691mat
@ -0,0 +1 @@
+FMFZr5UtmZkKH6vPzSZijJbpF3ySKLaocHNtHghJJdw
--- a/temp/flow_2c0ojqmxbidvqt6g964fnn
+++ b/temp/flow_2c0ojqmxbidvqt6g964fnn
@ -0,0 +1 @@
+dOeAMvn88EbHZAYx0EJNbrw97XhzbxZXXYOt7lF8zzQ
--- a/temp/flow_366pnjfy46z7a6ijrv2s2e
+++ b/temp/flow_366pnjfy46z7a6ijrv2s2e
@ -0,0 +1 @@
+3QEq5HYhdzRX3Rozulasmj2XAYlWiX9zwIJY2JDn4uw
--- a/temp/flow_9gk2f91f7rpr4zz1lza4n8
+++ b/temp/flow_9gk2f91f7rpr4zz1lza4n8
@ -0,0 +1 @@
+OJLAurMR0_MdWhsYAnGigFjClLrAaBwEDKIr5cddeuI
--- a/temp/flow_9xab9zbynrche1s5oqpko
+++ b/temp/flow_9xab9zbynrche1s5oqpko
@ -0,0 +1 @@
+S_yh9zW_PpgN5r4ngIESd5GRarZfMIBUoaGOJZhjpc8
--- a/temp/flow_adnvd9wrsykciwdbfz9da8
+++ b/temp/flow_adnvd9wrsykciwdbfz9da8
@ -0,0 +1 @@
+uWPueKrIXJdtgVGEQ9n8peXmz0B6qb1ohEmOqYgCdws
--- a/temp/flow_b7w5jcwll3tee0l4tq9ejw
+++ b/temp/flow_b7w5jcwll3tee0l4tq9ejw
@ -0,0 +1 @@
+HfOXX-niktBwwUJOLP6sq_IdbIWkVPt1BqWBbKKd_0A
--- a/temp/flow_bcw2mcd2l3pbfsvwp4t1tp
+++ b/temp/flow_bcw2mcd2l3pbfsvwp4t1tp
@ -0,0 +1 @@
+rOUTRmSFMJMPS0tUtqklfJo-_VAxMAFKCN8uprb0e64
--- a/temp/flow_be9y4se653i4ks1qdvhiu5
+++ b/temp/flow_be9y4se653i4ks1qdvhiu5
@ -0,0 +1 @@
+EsXqSioUt0FTlNfLcVIAPs9U3pS69nO1NbabgpPkyR0
--- a/temp/flow_bwluoig4sco7i5jrau0u
+++ b/temp/flow_bwluoig4sco7i5jrau0u
@ -0,0 +1 @@
+DPAF37_dnsfE2YZNDkvqBkFXs745JQ4I7KDftNEK5kM
--- a/temp/flow_ckkbeibg93nohnk87ljuk
+++ b/temp/flow_ckkbeibg93nohnk87ljuk
@ -0,0 +1 @@
+8PsIJrWP09gJqW_OSLCSygXlPqaiCPryBk-VR8mT2rA
--- a/temp/flow_ggo4fp8ui1ejwinui77ycf
+++ b/temp/flow_ggo4fp8ui1ejwinui77ycf
@ -0,0 +1 @@
+lYOBZxX217uXRwm85z7GNKsc7TViRZ9At3yUIGzkkPM
--- a/temp/flow_jp0vw18g9qe63tucqixezt
+++ b/temp/flow_jp0vw18g9qe63tucqixezt
@ -0,0 +1 @@
+TaOooO3g0FyrLrwTwJG45AkS7mLT0O1btt1P2Vr1dEQ
--- a/temp/flow_llg9kgdkbdmy8m7e023lm
+++ b/temp/flow_llg9kgdkbdmy8m7e023lm
@ -0,0 +1 @@
+BD9We2MPmCytIKlsH7Wug8bmW9_lU-Xrx_-c-qhpsEI
--- a/temp/flow_lp0v28msillw76xmk83sx
+++ b/temp/flow_lp0v28msillw76xmk83sx
@ -0,0 +1 @@
+OlX8iM3rrAro8J_Ncb4OvN6tLKuyfjLMEOG_xJkbeHU
--- a/temp/flow_lpmjxmln4o2axlfu9kb0n
+++ b/temp/flow_lpmjxmln4o2axlfu9kb0n
@ -0,0 +1 @@
+VMalTqVPTIUY-ynsIQJO4jG16KyxkMhsQgoKW3doOHo
--- a/temp/flow_nreir9hwdpjnylbl79ydl
+++ b/temp/flow_nreir9hwdpjnylbl79ydl
@ -0,0 +1 @@
+tIXKI7IDrAikA_SbBTW6XqBQfR2uuWAg9WQYpiZ5DE0
--- a/temp/flow_rx8dih8r80gzhlosl1glw
+++ b/temp/flow_rx8dih8r80gzhlosl1glw
@ -0,0 +1 @@
+LdpsUh6F78GzSXz5zfZUW2ZaUbjoCC-zGrCjnz4gtDU
--- a/temp/flow_thi2f1athskd4cculln0n
+++ b/temp/flow_thi2f1athskd4cculln0n
@ -0,0 +1 @@
+8Ch2fssgHUf4qTO4kHM-9yofisoalAufolmFkSOvo40
--- a/temp/flow_uiahlqg3uolo9x007xwhf
+++ b/temp/flow_uiahlqg3uolo9x007xwhf
@ -0,0 +1 @@
+Yx9ZPZ11yaa64EApoZKLNNp0cIsp-GWoZmPk8Rg3yJA
--- a/temp/flow_vf6gxl8c4s6583pxpelsc
+++ b/temp/flow_vf6gxl8c4s6583pxpelsc
@ -0,0 +1 @@
+0I35VFoN26g_y5ssRk0ilIjtmKD7s8oOVgqPCumt8Dw
--- a/temp/flow_vwgyv1bz05d69quclfqclo
+++ b/temp/flow_vwgyv1bz05d69quclfqclo
@ -0,0 +1 @@
+HoddM2bqLSELN9ICAn5Wx42dr0pLHrr-a48K_Zhes2w
--- a/temp/flow_w39k8p9uvnvcmj61wuzh
+++ b/temp/flow_w39k8p9uvnvcmj61wuzh
@ -0,0 +1 @@
+pdE7NC8nsUsxnywZah1akVtr324QI0zQVJOBabnyJSA
--- a/temp/flow_yjmm00zgy1ainhm9i6ggp
+++ b/temp/flow_yjmm00zgy1ainhm9i6ggp
@ -0,0 +1 @@
+20WBny0Y2NnacGObQ91zCjRGQZdLhWzH8BaQfsQOga0
--- a/temp/flow_z26sq4gy8aiyfr835akz2d
+++ b/temp/flow_z26sq4gy8aiyfr835akz2d
@ -0,0 +1 @@
+Bf8C4ChWmNROZkKLoMxVzQ9q6XMI253sje3d4IK_95Y
--- a/utils/config.ts
+++ b/utils/config.ts
@ -32,6 +32,17 @@ export interface ConfigType {
 		enabled: boolean;
 	};

+	oidc: {
+		providers: {
+			name: string;
+			id: string;
+			url: string;
+			client_id: string;
+			client_secret: string;
+			icon: string;
+		}[];
+	};
+
 	http: {
 		base_url: string;
 		bind: string;
@ -189,6 +200,9 @@ export const configDefaults: ConfigType = {
 		api_key: "",
 		enabled: false,
 	},
+	oidc: {
+		providers: [],
+	},
 	instance: {
 		banner: "",
 		description: "",
--- a/utils/constants.ts
+++ b/utils/constants.ts
@ -0,0 +1,6 @@
+import { getConfig } from "@config";
+
+const config = getConfig();
+
+export const oauthRedirectUri = (issuer: string) =>
+	`${config.http.base_url}/oauth/callback/${issuer}`;
--- a/utils/oauth.ts
+++ b/utils/oauth.ts
@ -59,3 +59,5 @@ export const checkIfOauthIsValid = (

 	return false;
 };
+
+export const oauthCodeVerifiers: Record<string, string> = {};
--- a/utils/temp.ts
+++ b/utils/temp.ts
@ -0,0 +1,20 @@
+import { join } from "path";
+import { exists, mkdir, writeFile, readFile } from "fs/promises";
+
+export const writeToTempDirectory = async (filename: string, data: string) => {
+	const tempDir = join(process.cwd(), "temp");
+	if (!(await exists(tempDir))) await mkdir(tempDir);
+
+	const tempFile = join(tempDir, filename);
+	await writeFile(tempFile, data);
+
+	return tempFile;
+};
+
+export const readFromTempDirectory = async (filename: string) => {
+	const tempDir = join(process.cwd(), "temp");
+	if (!(await exists(tempDir))) await mkdir(tempDir);
+
+	const tempFile = join(tempDir, filename);
+	return readFile(tempFile, "utf-8");
+};