Directly redirect to the openid auth provider if that's the only auth method

src/App.vue

@@ -56,7 +56,9 @@ export default {
 	},
 	beforeCreate() {
 		this.$store.dispatch('config/update')
+			.then(() => {
 				this.$store.dispatch('auth/checkAuth')
+			})
 
 		setLanguage()
 	},

src/helpers/redirectToProvider.ts

@@ -0,0 +1,13 @@
+interface Provider {
+	name: string
+	key: string
+	authUrl: string
+	clientId: string
+}
+
+export const redirectToProvider = (provider: Provider, redirectUrl: string) => {
+	const state = Math.random().toString(36).substring(2, 24)
+	localStorage.setItem('state', state)
+
+	window.location.href = `${provider.authUrl}?client_id=${provider.clientId}&redirect_uri=${redirectUrl}${provider.key}&response_type=code&scope=openid email profile&state=${state}`
+}

src/store/modules/auth.js

@@ -189,6 +189,7 @@ export default {
 			ctx.commit('authenticated', authenticated)
 			if (!authenticated) {
 				ctx.commit('info', null)
+				ctx.dispatch('config/redirectToProviderIfNothingElseIsEnabled', null, {root: true})
 			}
 
 			return Promise.resolve()

src/store/modules/config.js

@@ -3,6 +3,7 @@ import Vue from 'vue'
 import {CONFIG} from '../mutation-types'
 import {HTTPFactory} from '@/http-common'
 import {objectToCamelCase} from '@/helpers/case'
+import {redirectToProvider} from '../../helpers/redirectToProvider'
 
 export default {
 	namespaced: true,
@@ -69,5 +70,15 @@ export default {
 				})
 				.catch(e => Promise.reject(e))
 		},
+		redirectToProviderIfNothingElseIsEnabled(ctx) {
+			if (ctx.state.auth.local.enabled === false &&
+				ctx.state.auth.openidConnect.enabled &&
+				ctx.state.auth.openidConnect.providers &&
+				ctx.state.auth.openidConnect.providers.length === 1 &&
+				window.location.pathname.startsWith('/login') // Kinda hacky, but prevents an endless loop.
+			) {
+				redirectToProvider(ctx.state.auth.openidConnect.providers[0], ctx.state.auth.openidConnect.redirectUrl)
+			}
+		},
 	},
 }

src/views/user/Login.vue

@@ -83,7 +83,7 @@
 			</form>
 
 			<div
-				v-if="hasApiUrl && openidConnect.enabled && openidConnect.providers && openidConnect.providers.length > 0"
+				v-if="hasOpenIdProviders"
 				class="mt-4">
 				<x-button
 					@click="redirectToProvider(p)"
@@ -110,6 +110,7 @@ import {ERROR_MESSAGE, LOADING} from '@/store/mutation-types'
 import legal from '../../components/misc/legal'
 import ApiConfig from '@/components/misc/api-config.vue'
 import {getErrorText} from '@/message'
+import {redirectToProvider} from '../../helpers/redirectToProvider'
 
 export default {
 	components: {
@@ -150,7 +151,14 @@ export default {
 		this.hasApiUrl = window.API_URL !== ''
 		this.setTitle(this.$t('user.auth.login'))
 	},
-	computed: mapState({
+	computed: {
+		hasOpenIdProviders() {
+			return this.hasApiUrl &&
+				this.openidConnect.enabled &&
+				this.openidConnect.providers &&
+				this.openidConnect.providers.length > 0
+		},
+		...mapState({
 			registrationEnabled: state => state.config.registrationEnabled,
 			loading: LOADING,
 			errorMessage: ERROR_MESSAGE,
@@ -159,6 +167,7 @@ export default {
 			localAuthEnabled: state => state.config.auth.local.enabled,
 			openidConnect: state => state.config.auth.openidConnect,
 		}),
+	},
 	methods: {
 		setLoading() {
 			const timeout = setTimeout(() => {
@@ -202,10 +211,7 @@ export default {
 				})
 		},
 		redirectToProvider(provider) {
-			const state = Math.random().toString(36).substring(2, 24)
-			localStorage.setItem('state', state)
-
-			window.location.href = `${provider.authUrl}?client_id=${provider.clientId}&redirect_uri=${this.openidConnect.redirectUrl}${provider.key}&response_type=code&scope=openid email profile&state=${state}`
+			redirectToProvider(provider, this.openidConnect.redirectUrl)
 		},
 	},
 }