feat: style oauth auto redirect screen

cmd/root.go

@@ -27,11 +27,6 @@ var rootCmd = &cobra.Command{
 			log.Fatal().Err(err).Msg("Failed to parse config")
 		}
 
-		// Check if secrets have a file associated with them
-		conf.GithubClientSecret = utils.GetSecret(conf.GithubClientSecret, conf.GithubClientSecretFile)
-		conf.GoogleClientSecret = utils.GetSecret(conf.GoogleClientSecret, conf.GoogleClientSecretFile)
-		conf.GenericClientSecret = utils.GetSecret(conf.GenericClientSecret, conf.GenericClientSecretFile)
-
 		// Validate config
 		v := validator.New()
 
@@ -57,6 +52,7 @@ var rootCmd = &cobra.Command{
 }
 
 func Execute() {
+	rootCmd.FParseErrWhitelist.UnknownFlags = true
 	err := rootCmd.Execute()
 	if err != nil {
 		log.Fatal().Err(err).Msg("Failed to execute command")
@@ -80,21 +76,6 @@ func init() {
 		{"users", "", "Comma separated list of users in the format username:hash."},
 		{"users-file", "", "Path to a file containing users in the format username:hash."},
 		{"secure-cookie", false, "Send cookie over secure connection only."},
-		{"github-client-id", "", "Github OAuth client ID."},
-		{"github-client-secret", "", "Github OAuth client secret."},
-		{"github-client-secret-file", "", "Github OAuth client secret file."},
-		{"google-client-id", "", "Google OAuth client ID."},
-		{"google-client-secret", "", "Google OAuth client secret."},
-		{"google-client-secret-file", "", "Google OAuth client secret file."},
-		{"generic-client-id", "", "Generic OAuth client ID."},
-		{"generic-client-secret", "", "Generic OAuth client secret."},
-		{"generic-client-secret-file", "", "Generic OAuth client secret file."},
-		{"generic-scopes", "", "Generic OAuth scopes."},
-		{"generic-auth-url", "", "Generic OAuth auth URL."},
-		{"generic-token-url", "", "Generic OAuth token URL."},
-		{"generic-user-url", "", "Generic OAuth user info URL."},
-		{"generic-name", "Generic", "Generic OAuth provider name."},
-		{"generic-skip-ssl", false, "Skip SSL verification for the generic OAuth provider."},
 		{"oauth-whitelist", "", "Comma separated list of email addresses to whitelist when using OAuth."},
 		{"oauth-auto-redirect", "none", "Auto redirect to the specified OAuth provider if configured. (available providers: github, google, generic)"},
 		{"session-expiry", 86400, "Session (cookie) expiration time in seconds."},
@@ -112,7 +93,7 @@ func init() {
 		{"ldap-search-filter", "(uid=%s)", "LDAP search filter for user lookup."},
 		{"resources-dir", "/data/resources", "Path to a directory containing custom resources (e.g. background image)."},
 		{"database-path", "/data/tinyauth.db", "Path to the Sqlite database file."},
-		{"trusted-proxies", "", "Comma separated list of trusted proxies (IP addresses) for correct client IP detection and for header ACLs."},
+		{"trusted-proxies", "", "Comma separated list of trusted proxies (IP addresses or CIDRs) for correct client IP detection."},
 	}
 
 	for _, opt := range configOptions {

frontend/src/components/icons/microsoft.tsx

@@ -0,0 +1,18 @@
+import type { SVGProps } from "react";
+
+export function MicrosoftIcon(props: SVGProps<SVGSVGElement>) {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="2em"
+      height="2em"
+      viewBox="0 0 256 256"
+      {...props}
+    >
+      <path fill="#f1511b" d="M121.666 121.666H0V0h121.666z"></path>
+      <path fill="#80cc28" d="M256 121.666H134.335V0H256z"></path>
+      <path fill="#00adef" d="M121.663 256.002H0V134.336h121.663z"></path>
+      <path fill="#fbbc09" d="M256 256.002H134.335V134.336H256z"></path>
+    </svg>
+  );
+}

frontend/src/components/icons/oauth.tsx

@@ -1,6 +1,6 @@
 import type { SVGProps } from "react";
 
-export function GenericIcon(props: SVGProps<SVGSVGElement>) {
+export function OAuthIcon(props: SVGProps<SVGSVGElement>) {
   return (
     <svg
       xmlns="http://www.w3.org/2000/svg"

frontend/src/components/icons/pocket-id.tsx

@@ -0,0 +1,20 @@
+import type { SVGProps } from "react";
+
+export function PocketIDIcon(props: SVGProps<SVGSVGElement>) {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      xmlSpace="preserve"
+      width={512}
+      height={512}
+      viewBox="0 0 512 512"
+      {...props}
+    >
+      <circle cx="256" cy="256" r="256" />
+      <path
+        d="M268.6 102.4c64.4 0 116.8 52.4 116.8 116.7 0 25.3-8 49.4-23 69.6-14.8 19.9-35 34.3-58.4 41.7l-6.5 2-15.5-76.2 4.3-2c14-6.7 23-21.1 23-36.6 0-22.4-18.2-40.6-40.6-40.6S228 195.2 228 217.6c0 15.5 9 29.8 23 36.6l4.2 2-25 153.4h-69.5V102.4z"
+        className="fill-white"
+      />
+    </svg>
+  );
+}

frontend/src/components/icons/tailscale.tsx

@@ -0,0 +1,24 @@
+import type { SVGProps } from "react";
+
+export function TailscaleIcon(props: SVGProps<SVGSVGElement>) {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      xmlSpace="preserve"
+      width={512}
+      height={512}
+      viewBox="0 0 512 512"
+      {...props}
+    >
+      <path
+        className="opacity-80 fill-white"
+        d="M65.6 318.1c35.3 0 63.9-28.6 63.9-63.9s-28.6-63.9-63.9-63.9S1.8 219 1.8 254.2s28.6 63.9 63.8 63.9m191.6 0c35.3 0 63.9-28.6 63.9-63.9s-28.6-63.9-63.9-63.9-63.9 28.6-63.9 63.9 28.6 63.9 63.9 63.9m0 193.9c35.3 0 63.9-28.6 63.9-63.9s-28.6-63.9-63.9-63.9-63.9 28.6-63.9 63.9 28.6 63.9 63.9 63.9m189.2-193.9c35.3 0 63.9-28.6 63.9-63.9s-28.6-63.9-63.9-63.9-63.9 28.6-63.9 63.9 28.6 63.9 63.9 63.9"
+      />
+
+      <path
+        d="M65.6 127.7c35.3 0 63.9-28.6 63.9-63.9S100.9 0 65.6 0 1.8 28.6 1.8 63.9s28.6 63.8 63.8 63.8m0 384.3c35.3 0 63.9-28.6 63.9-63.9s-28.6-63.9-63.9-63.9-63.8 28.7-63.8 63.9S30.4 512 65.6 512m191.6-384.3c35.3 0 63.9-28.6 63.9-63.9S292.5 0 257.2 0s-63.9 28.6-63.9 63.9 28.6 63.8 63.9 63.8m189.2 0c35.3 0 63.9-28.6 63.9-63.9S481.6 0 446.4 0c-35.3 0-63.9 28.6-63.9 63.9s28.6 63.8 63.9 63.8m0 384.3c35.3 0 63.9-28.6 63.9-63.9s-28.6-63.9-63.9-63.9-63.9 28.6-63.9 63.9 28.6 63.9 63.9 63.9"
+        className="opacity-20 fill-white"
+      />
+    </svg>
+  );
+}

frontend/src/lib/i18n/locales/en-US.json

@@ -14,6 +14,9 @@
     "loginOauthFailSubtitle": "Failed to get OAuth URL",
     "loginOauthSuccessTitle": "Redirecting",
     "loginOauthSuccessSubtitle": "Redirecting to your OAuth provider",
+    "loginOauthAutoRedirectTitle": "OAuth Auto Redirect",
+    "loginOauthAutoRedirectSubtitle": "You will be automatically redirected to your OAuth provider to authenticate.",
+    "loginOauthAutoRedirectButton": "Redirect now",
     "continueTitle": "Continue",
     "continueRedirectingTitle": "Redirecting...",
     "continueRedirectingSubtitle": "You should be redirected to the app soon",

frontend/src/lib/i18n/locales/en.json

@@ -14,6 +14,9 @@
     "loginOauthFailSubtitle": "Failed to get OAuth URL",
     "loginOauthSuccessTitle": "Redirecting",
     "loginOauthSuccessSubtitle": "Redirecting to your OAuth provider",
+    "loginOauthAutoRedirectTitle": "OAuth Auto Redirect",
+    "loginOauthAutoRedirectSubtitle": "You will be automatically redirected to your OAuth provider to authenticate.",
+    "loginOauthAutoRedirectButton": "Redirect now",
     "continueTitle": "Continue",
     "continueRedirectingTitle": "Redirecting...",
     "continueRedirectingSubtitle": "You should be redirected to the app soon",

frontend/src/pages/continue-page.tsx

@@ -70,7 +70,7 @@ export const ContinuePage = () => {
     const reveal = setTimeout(() => {
       setLoading(false);
       setShowRedirectButton(true);
-    }, 1000);
+    }, 5000);
 
     return () => {
       clearTimeout(auto);

frontend/src/pages/login-page.tsx

@@ -1,13 +1,18 @@
 import { LoginForm } from "@/components/auth/login-form";
-import { GenericIcon } from "@/components/icons/generic";
 import { GithubIcon } from "@/components/icons/github";
 import { GoogleIcon } from "@/components/icons/google";
+import { MicrosoftIcon } from "@/components/icons/microsoft";
+import { OAuthIcon } from "@/components/icons/oauth";
+import { PocketIDIcon } from "@/components/icons/pocket-id";
+import { TailscaleIcon } from "@/components/icons/tailscale";
+import { Button } from "@/components/ui/button";
 import {
   Card,
   CardHeader,
   CardTitle,
   CardDescription,
   CardContent,
+  CardFooter,
 } from "@/components/ui/card";
 import { OAuthButton } from "@/components/ui/oauth-button";
 import { SeperatorWithChildren } from "@/components/ui/separator";
@@ -17,28 +22,40 @@ import { useIsMounted } from "@/lib/hooks/use-is-mounted";
 import { LoginSchema } from "@/schemas/login-schema";
 import { useMutation } from "@tanstack/react-query";
 import axios, { AxiosError } from "axios";
-import { useEffect, useRef } from "react";
+import { useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { Navigate, useLocation } from "react-router";
 import { toast } from "sonner";
 
+const iconMap: Record<string, React.ReactNode> = {
+  google: <GoogleIcon />,
+  github: <GithubIcon />,
+  tailscale: <TailscaleIcon />,
+  microsoft: <MicrosoftIcon />,
+  pocketid: <PocketIDIcon />,
+};
+
 export const LoginPage = () => {
   const { isLoggedIn } = useUserContext();
-  const { configuredProviders, title, oauthAutoRedirect, genericName } =
-    useAppContext();
+  const { providers, title, oauthAutoRedirect } = useAppContext();
   const { search } = useLocation();
   const { t } = useTranslation();
   const isMounted = useIsMounted();
+  const [oauthAutoRedirectHandover, setOauthAutoRedirectHandover] =
+    useState(false);
+  const [showRedirectButton, setShowRedirectButton] = useState(false);
 
   const redirectTimer = useRef<number | null>(null);
+  const redirectButtonTimer = useRef<number | null>(null);
 
   const searchParams = new URLSearchParams(search);
   const redirectUri = searchParams.get("redirect_uri");
 
-  const oauthConfigured =
-    configuredProviders.filter((provider) => provider !== "username").length >
-    0;
-  const userAuthConfigured = configuredProviders.includes("username");
+  const oauthProviders = providers.filter(
+    (provider) => provider.id !== "username",
+  );
+  const userAuthConfigured =
+    providers.find((provider) => provider.id === "username") !== undefined;
 
   const oauthMutation = useMutation({
     mutationFn: (provider: string) =>
@@ -56,6 +73,7 @@ export const LoginPage = () => {
       }, 500);
     },
     onError: () => {
+      setOauthAutoRedirectHandover(false);
       toast.error(t("loginOauthFailTitle"), {
         description: t("loginOauthFailSubtitle"),
       });
@@ -96,12 +114,16 @@ export const LoginPage = () => {
   useEffect(() => {
     if (isMounted()) {
       if (
-        oauthConfigured &&
-        configuredProviders.includes(oauthAutoRedirect) &&
+        oauthProviders.length !== 0 &&
+        providers.find((provider) => provider.id === oauthAutoRedirect) &&
         !isLoggedIn &&
         redirectUri
       ) {
+        setOauthAutoRedirectHandover(true);
         oauthMutation.mutate(oauthAutoRedirect);
+        redirectButtonTimer.current = window.setTimeout(() => {
+          setShowRedirectButton(true);
+        }, 5000);
       }
     }
   }, []);
@@ -109,6 +131,8 @@ export const LoginPage = () => {
   useEffect(
     () => () => {
       if (redirectTimer.current) clearTimeout(redirectTimer.current);
+      if (redirectButtonTimer.current)
+        clearTimeout(redirectButtonTimer.current);
     },
     [],
   );
@@ -126,61 +150,63 @@ export const LoginPage = () => {
     return <Navigate to="/logout" replace />;
   }
 
+  if (oauthAutoRedirectHandover) {
+    return (
+      <Card className="min-w-xs sm:min-w-sm">
+        <CardHeader>
+          <CardTitle className="text-3xl">
+            {t("loginOauthAutoRedirectTitle")}
+          </CardTitle>
+          <CardDescription>
+            {t("loginOauthAutoRedirectSubtitle")}
+          </CardDescription>
+        </CardHeader>
+        {showRedirectButton && (
+          <CardFooter className="flex flex-col items-stretch">
+            <Button
+              onClick={() => {
+                window.location.replace(oauthMutation.data?.data.url);
+              }}
+            >
+              {t("loginOauthAutoRedirectButton")}
+            </Button>
+          </CardFooter>
+        )}
+      </Card>
+    );
+  }
   return (
     <Card className="min-w-xs sm:min-w-sm">
       <CardHeader>
         <CardTitle className="text-center text-3xl">{title}</CardTitle>
-        {configuredProviders.length > 0 && (
+        {providers.length > 0 && (
           <CardDescription className="text-center">
-            {oauthConfigured ? t("loginTitle") : t("loginTitleSimple")}
+            {oauthProviders.length !== 0
+              ? t("loginTitle")
+              : t("loginTitleSimple")}
           </CardDescription>
         )}
       </CardHeader>
       <CardContent className="flex flex-col gap-4">
-        {oauthConfigured && (
+        {oauthProviders.length !== 0 && (
           <div className="flex flex-col gap-2 items-center justify-center">
-            {configuredProviders.includes("google") && (
+            {oauthProviders.map((provider) => (
               <OAuthButton
-                title="Google"
-                icon={<GoogleIcon />}
+                key={provider.id}
+                title={provider.name}
+                icon={iconMap[provider.id] ?? <OAuthIcon />}
                 className="w-full"
-                onClick={() => oauthMutation.mutate("google")}
+                onClick={() => oauthMutation.mutate(provider.id)}
                 loading={
                   oauthMutation.isPending &&
-                  oauthMutation.variables === "google"
+                  oauthMutation.variables === provider.id
                 }
                 disabled={oauthMutation.isPending || loginMutation.isPending}
               />
-            )}
-            {configuredProviders.includes("github") && (
-              <OAuthButton
-                title="Github"
-                icon={<GithubIcon />}
-                className="w-full"
-                onClick={() => oauthMutation.mutate("github")}
-                loading={
-                  oauthMutation.isPending &&
-                  oauthMutation.variables === "github"
-                }
-                disabled={oauthMutation.isPending || loginMutation.isPending}
-              />
-            )}
-            {configuredProviders.includes("generic") && (
-              <OAuthButton
-                title={genericName}
-                icon={<GenericIcon />}
-                className="w-full"
-                onClick={() => oauthMutation.mutate("generic")}
-                loading={
-                  oauthMutation.isPending &&
-                  oauthMutation.variables === "generic"
-                }
-                disabled={oauthMutation.isPending || loginMutation.isPending}
-              />
-            )}
+            ))}
           </div>
         )}
-        {userAuthConfigured && oauthConfigured && (
+        {userAuthConfigured && oauthProviders.length !== 0 && (
           <SeperatorWithChildren>{t("loginDivider")}</SeperatorWithChildren>
         )}
         {userAuthConfigured && (
@@ -189,7 +215,7 @@ export const LoginPage = () => {
             loading={loginMutation.isPending || oauthMutation.isPending}
           />
         )}
-        {configuredProviders.length == 0 && (
+        {providers.length == 0 && (
           <p className="text-center text-red-600 max-w-sm">
             {t("failedToFetchProvidersTitle")}
           </p>

frontend/src/pages/logout-page.tsx

@@ -6,9 +6,7 @@ import {
   CardHeader,
   CardTitle,
 } from "@/components/ui/card";
-import { useAppContext } from "@/context/app-context";
 import { useUserContext } from "@/context/user-context";
-import { capitalize } from "@/lib/utils";
 import { useMutation } from "@tanstack/react-query";
 import axios from "axios";
 import { useEffect, useRef } from "react";
@@ -17,8 +15,7 @@ import { Navigate } from "react-router";
 import { toast } from "sonner";
 
 export const LogoutPage = () => {
-  const { provider, username, isLoggedIn, email } = useUserContext();
-  const { genericName } = useAppContext();
+  const { provider, username, isLoggedIn, email, oauthName } = useUserContext();
   const { t } = useTranslation();
 
   const redirectTimer = useRef<number | null>(null);
@@ -67,8 +64,7 @@ export const LogoutPage = () => {
               }}
               values={{
                 username: email,
-                provider:
-                  provider === "generic" ? genericName : capitalize(provider),
+                provider: oauthName,
               }}
             />
           ) : (

frontend/src/schemas/app-context-schema.ts

@@ -1,14 +1,19 @@
 import { z } from "zod";
 
+export const providerSchema = z.object({
+  id: z.string(),
+  name: z.string(),
+  oauth: z.boolean(),
+});
+
 export const appContextSchema = z.object({
-  configuredProviders: z.array(z.string()),
+  providers: z.array(providerSchema),
   title: z.string(),
-  genericName: z.string(),
   appUrl: z.string(),
   cookieDomain: z.string(),
   forgotPasswordMessage: z.string(),
-  oauthAutoRedirect: z.enum(["none", "github", "google", "generic"]),
   backgroundImage: z.string(),
+  oauthAutoRedirect: z.string(),
 });
 
 export type AppContextSchema = z.infer<typeof appContextSchema>;

frontend/src/schemas/user-context-schema.ts

@@ -8,6 +8,7 @@ export const userContextSchema = z.object({
   provider: z.string(),
   oauth: z.boolean(),
   totpPending: z.boolean(),
+  oauthName: z.string(),
 });
 
 export type UserContextSchema = z.infer<typeof userContextSchema>;

internal/assets/migrations/000002_oauth_name.down.sql

@@ -0,0 +1 @@
+ALTER TABLE "sessions" DROP COLUMN "oauth_name";

internal/assets/migrations/000002_oauth_name.up.sql

@@ -0,0 +1,8 @@
+ALTER TABLE "sessions" ADD COLUMN "oauth_name" TEXT;
+
+UPDATE
+    "sessions"
+SET
+    "oauth_name" = "Generic"
+WHERE
+    "oauth_name" IS NULL AND "provider" IS NOT NULL;

internal/bootstrap/app_bootstrap.go

@@ -3,6 +3,7 @@ package bootstrap
 import (
 	"fmt"
 	"net/url"
+	"os"
 	"strings"
 	"tinyauth/internal/config"
 	"tinyauth/internal/controller"
@@ -45,6 +46,13 @@ func (app *BootstrapApp) Setup() error {
 		return err
 	}
 
+	// Get OAuth configs
+	oauthProviders, err := utils.GetOAuthProvidersConfig(os.Environ(), os.Args, app.Config.AppURL)
+
+	if err != nil {
+		return err
+	}
+
 	// Get cookie domain
 	cookieDomain, err := utils.GetCookieDomain(app.Config.AppURL)
 
@@ -112,7 +120,7 @@ func (app *BootstrapApp) Setup() error {
 	// Create services
 	dockerService := service.NewDockerService()
 	authService := service.NewAuthService(authConfig, dockerService, ldapService, database)
-	oauthBrokerService := service.NewOAuthBrokerService(app.getOAuthBrokerConfig())
+	oauthBrokerService := service.NewOAuthBrokerService(oauthProviders)
 
 	// Initialize services
 	services := []Service{
@@ -132,13 +140,41 @@ func (app *BootstrapApp) Setup() error {
 	}
 
 	// Configured providers
-	var configuredProviders []string
+	babysit := map[string]string{
+		"google": "Google",
+		"github": "GitHub",
+	}
+	configuredProviders := make([]controller.Provider, 0)
 
-	if authService.UserAuthConfigured() || ldapService != nil {
-		configuredProviders = append(configuredProviders, "username")
+	for id, provider := range oauthProviders {
+		if id == "" {
+			continue
+		}
+
+		if provider.Name == "" {
+			if name, ok := babysit[id]; ok {
+				provider.Name = name
+			} else {
+				provider.Name = utils.Capitalize(id)
+			}
+		}
+
+		configuredProviders = append(configuredProviders, controller.Provider{
+			Name:  provider.Name,
+			ID:    id,
+			OAuth: true,
+		})
 	}
 
-	configuredProviders = append(configuredProviders, oauthBrokerService.GetConfiguredServices()...)
+	if authService.UserAuthConfigured() || ldapService != nil {
+		configuredProviders = append(configuredProviders, controller.Provider{
+			Name:  "Username",
+			ID:    "username",
+			OAuth: false,
+		})
+	}
+
+	log.Debug().Interface("providers", configuredProviders).Msg("Authentication providers")
 
 	if len(configuredProviders) == 0 {
 		return fmt.Errorf("no authentication providers configured")
@@ -179,9 +215,8 @@ func (app *BootstrapApp) Setup() error {
 
 	// Create controllers
 	contextController := controller.NewContextController(controller.ContextControllerConfig{
-		ConfiguredProviders:   configuredProviders,
+		Providers:             configuredProviders,
 		Title:                 app.Config.Title,
-		GenericName:           app.Config.GenericName,
 		AppURL:                app.Config.AppURL,
 		CookieDomain:          cookieDomain,
 		ForgotPasswordMessage: app.Config.ForgotPasswordMessage,
@@ -235,30 +270,3 @@ func (app *BootstrapApp) Setup() error {
 
 	return nil
 }
-
-// Temporary
-func (app *BootstrapApp) getOAuthBrokerConfig() map[string]config.OAuthServiceConfig {
-	return map[string]config.OAuthServiceConfig{
-		"google": {
-			ClientID:     app.Config.GoogleClientId,
-			ClientSecret: app.Config.GoogleClientSecret,
-			RedirectURL:  fmt.Sprintf("%s/api/oauth/callback/google", app.Config.AppURL),
-		},
-		"github": {
-			ClientID:     app.Config.GithubClientId,
-			ClientSecret: app.Config.GithubClientSecret,
-			RedirectURL:  fmt.Sprintf("%s/api/oauth/callback/github", app.Config.AppURL),
-		},
-		"generic": {
-			ClientID:           app.Config.GenericClientId,
-			ClientSecret:       app.Config.GenericClientSecret,
-			RedirectURL:        fmt.Sprintf("%s/api/oauth/callback/generic", app.Config.AppURL),
-			Scopes:             strings.Split(app.Config.GenericScopes, ","),
-			AuthURL:            app.Config.GenericAuthURL,
-			TokenURL:           app.Config.GenericTokenURL,
-			UserinfoURL:        app.Config.GenericUserURL,
-			InsecureSkipVerify: app.Config.GenericSkipSSL,
-		},
-	}
-
-}

internal/config/config.go

@@ -15,45 +15,30 @@ var RedirectCookieName = "tinyauth-redirect"
 // Main app config
 
 type Config struct {
-	Port                    int    `mapstructure:"port" validate:"required"`
-	Address                 string `validate:"required,ip4_addr" mapstructure:"address"`
-	AppURL                  string `validate:"required,url" mapstructure:"app-url"`
-	Users                   string `mapstructure:"users"`
-	UsersFile               string `mapstructure:"users-file"`
-	SecureCookie            bool   `mapstructure:"secure-cookie"`
-	GithubClientId          string `mapstructure:"github-client-id"`
-	GithubClientSecret      string `mapstructure:"github-client-secret"`
-	GithubClientSecretFile  string `mapstructure:"github-client-secret-file"`
-	GoogleClientId          string `mapstructure:"google-client-id"`
-	GoogleClientSecret      string `mapstructure:"google-client-secret"`
-	GoogleClientSecretFile  string `mapstructure:"google-client-secret-file"`
-	GenericClientId         string `mapstructure:"generic-client-id"`
-	GenericClientSecret     string `mapstructure:"generic-client-secret"`
-	GenericClientSecretFile string `mapstructure:"generic-client-secret-file"`
-	GenericScopes           string `mapstructure:"generic-scopes"`
-	GenericAuthURL          string `mapstructure:"generic-auth-url"`
-	GenericTokenURL         string `mapstructure:"generic-token-url"`
-	GenericUserURL          string `mapstructure:"generic-user-url"`
-	GenericName             string `mapstructure:"generic-name"`
-	GenericSkipSSL          bool   `mapstructure:"generic-skip-ssl"`
-	OAuthWhitelist          string `mapstructure:"oauth-whitelist"`
-	OAuthAutoRedirect       string `mapstructure:"oauth-auto-redirect" validate:"oneof=none github google generic"`
-	SessionExpiry           int    `mapstructure:"session-expiry"`
-	LogLevel                string `mapstructure:"log-level" validate:"oneof=trace debug info warn error fatal panic"`
-	Title                   string `mapstructure:"app-title"`
-	LoginTimeout            int    `mapstructure:"login-timeout"`
-	LoginMaxRetries         int    `mapstructure:"login-max-retries"`
-	ForgotPasswordMessage   string `mapstructure:"forgot-password-message"`
-	BackgroundImage         string `mapstructure:"background-image" validate:"required"`
-	LdapAddress             string `mapstructure:"ldap-address"`
-	LdapBindDN              string `mapstructure:"ldap-bind-dn"`
-	LdapBindPassword        string `mapstructure:"ldap-bind-password"`
-	LdapBaseDN              string `mapstructure:"ldap-base-dn"`
-	LdapInsecure            bool   `mapstructure:"ldap-insecure"`
-	LdapSearchFilter        string `mapstructure:"ldap-search-filter"`
-	ResourcesDir            string `mapstructure:"resources-dir"`
-	DatabasePath            string `mapstructure:"database-path" validate:"required"`
-	TrustedProxies          string `mapstructure:"trusted-proxies"`
+	Port                  int    `mapstructure:"port" validate:"required"`
+	Address               string `validate:"required,ip4_addr" mapstructure:"address"`
+	AppURL                string `validate:"required,url" mapstructure:"app-url"`
+	Users                 string `mapstructure:"users"`
+	UsersFile             string `mapstructure:"users-file"`
+	SecureCookie          bool   `mapstructure:"secure-cookie"`
+	OAuthWhitelist        string `mapstructure:"oauth-whitelist"`
+	OAuthAutoRedirect     string `mapstructure:"oauth-auto-redirect"`
+	SessionExpiry         int    `mapstructure:"session-expiry"`
+	LogLevel              string `mapstructure:"log-level" validate:"oneof=trace debug info warn error fatal panic"`
+	Title                 string `mapstructure:"app-title"`
+	LoginTimeout          int    `mapstructure:"login-timeout"`
+	LoginMaxRetries       int    `mapstructure:"login-max-retries"`
+	ForgotPasswordMessage string `mapstructure:"forgot-password-message"`
+	BackgroundImage       string `mapstructure:"background-image" validate:"required"`
+	LdapAddress           string `mapstructure:"ldap-address"`
+	LdapBindDN            string `mapstructure:"ldap-bind-dn"`
+	LdapBindPassword      string `mapstructure:"ldap-bind-password"`
+	LdapBaseDN            string `mapstructure:"ldap-base-dn"`
+	LdapInsecure          bool   `mapstructure:"ldap-insecure"`
+	LdapSearchFilter      string `mapstructure:"ldap-search-filter"`
+	ResourcesDir          string `mapstructure:"resources-dir"`
+	DatabasePath          string `mapstructure:"database-path" validate:"required"`
+	TrustedProxies        string `mapstructure:"trusted-proxies"`
 }
 
 // OAuth/OIDC config
@@ -68,12 +53,14 @@ type Claims struct {
 type OAuthServiceConfig struct {
 	ClientID           string
 	ClientSecret       string
+	ClientSecretFile   string
 	Scopes             []string
 	RedirectURL        string
 	AuthURL            string
 	TokenURL           string
 	UserinfoURL        string
 	InsecureSkipVerify bool
+	Name               string
 }
 
 // User/session related stuff
@@ -97,6 +84,7 @@ type SessionCookie struct {
 	Provider    string
 	TotpPending bool
 	OAuthGroups string
+	OAuthName   string
 }
 
 type UserContext struct {
@@ -109,6 +97,7 @@ type UserContext struct {
 	TotpPending bool
 	OAuthGroups string
 	TotpEnabled bool
+	OAuthName   string
 }
 
 // API responses and queries
@@ -174,3 +163,9 @@ type AppPath struct {
 	Allow string
 	Block string
 }
+
+// Flags
+
+type Providers struct {
+	Providers map[string]OAuthServiceConfig
+}

internal/controller/context_controller.go

@@ -19,25 +19,30 @@ type UserContextResponse struct {
 	Provider    string `json:"provider"`
 	OAuth       bool   `json:"oauth"`
 	TotpPending bool   `json:"totpPending"`
+	OAuthName   string `json:"oauthName"`
 }
 
 type AppContextResponse struct {
-	Status                int      `json:"status"`
-	Message               string   `json:"message"`
-	ConfiguredProviders   []string `json:"configuredProviders"`
-	Title                 string   `json:"title"`
-	GenericName           string   `json:"genericName"`
-	AppURL                string   `json:"appUrl"`
-	CookieDomain          string   `json:"cookieDomain"`
-	ForgotPasswordMessage string   `json:"forgotPasswordMessage"`
-	BackgroundImage       string   `json:"backgroundImage"`
-	OAuthAutoRedirect     string   `json:"oauthAutoRedirect"`
+	Status                int        `json:"status"`
+	Message               string     `json:"message"`
+	Providers             []Provider `json:"providers"`
+	Title                 string     `json:"title"`
+	AppURL                string     `json:"appUrl"`
+	CookieDomain          string     `json:"cookieDomain"`
+	ForgotPasswordMessage string     `json:"forgotPasswordMessage"`
+	BackgroundImage       string     `json:"backgroundImage"`
+	OAuthAutoRedirect     string     `json:"oauthAutoRedirect"`
+}
+
+type Provider struct {
+	Name  string `json:"name"`
+	ID    string `json:"id"`
+	OAuth bool   `json:"oauth"`
 }
 
 type ContextControllerConfig struct {
-	ConfiguredProviders   []string
+	Providers             []Provider
 	Title                 string
-	GenericName           string
 	AppURL                string
 	CookieDomain          string
 	ForgotPasswordMessage string
@@ -76,6 +81,7 @@ func (controller *ContextController) userContextHandler(c *gin.Context) {
 		Provider:    context.Provider,
 		OAuth:       context.OAuth,
 		TotpPending: context.TotpPending,
+		OAuthName:   context.OAuthName,
 	}
 
 	if err != nil {
@@ -96,9 +102,8 @@ func (controller *ContextController) appContextHandler(c *gin.Context) {
 	c.JSON(200, AppContextResponse{
 		Status:                200,
 		Message:               "Success",
-		ConfiguredProviders:   controller.config.ConfiguredProviders,
+		Providers:             controller.config.Providers,
 		Title:                 controller.config.Title,
-		GenericName:           controller.config.GenericName,
 		AppURL:                fmt.Sprintf("%s://%s", appUrl.Scheme, appUrl.Host),
 		CookieDomain:          controller.config.CookieDomain,
 		ForgotPasswordMessage: controller.config.ForgotPasswordMessage,

internal/controller/context_controller_test.go

@@ -12,9 +12,19 @@ import (
 )
 
 var controllerCfg = controller.ContextControllerConfig{
-	ConfiguredProviders:   []string{"github", "google", "generic"},
+	Providers: []controller.Provider{
+		{
+			Name:  "Username",
+			ID:    "username",
+			OAuth: false,
+		},
+		{
+			Name:  "Google",
+			ID:    "google",
+			OAuth: true,
+		},
+	},
 	Title:                 "Test App",
-	GenericName:           "Generic",
 	AppURL:                "http://localhost:8080",
 	CookieDomain:          "localhost",
 	ForgotPasswordMessage: "Contact admin to reset your password.",
@@ -58,9 +68,8 @@ func TestAppContextHandler(t *testing.T) {
 	expectedRes := controller.AppContextResponse{
 		Status:                200,
 		Message:               "Success",
-		ConfiguredProviders:   controllerCfg.ConfiguredProviders,
+		Providers:             controllerCfg.Providers,
 		Title:                 controllerCfg.Title,
-		GenericName:           controllerCfg.GenericName,
 		AppURL:                controllerCfg.AppURL,
 		CookieDomain:          controllerCfg.CookieDomain,
 		ForgotPasswordMessage: controllerCfg.ForgotPasswordMessage,

internal/controller/oauth_controller.go

@@ -186,6 +186,7 @@ func (controller *OAuthController) oauthCallbackHandler(c *gin.Context) {
 		Email:       user.Email,
 		Provider:    req.Provider,
 		OAuthGroups: utils.CoalesceToString(user.Groups),
+		OAuthName:   service.GetName(),
 	})
 
 	if err != nil {

internal/middleware/context_middleware.go

@@ -95,6 +95,7 @@ func (m *ContextMiddleware) Middleware() gin.HandlerFunc {
 				Email:       cookie.Email,
 				Provider:    cookie.Provider,
 				OAuthGroups: cookie.OAuthGroups,
+				OAuthName:   cookie.OAuthName,
 				IsLoggedIn:  true,
 				OAuth:       true,
 			})

internal/model/session_model.go

@@ -9,4 +9,5 @@ type Session struct {
 	TOTPPending bool   `gorm:"column:totp_pending"`
 	OAuthGroups string `gorm:"column:oauth_groups"`
 	Expiry      int64  `gorm:"column:expiry"`
+	OAuthName   string `gorm:"column:oauth_name"`
 }

internal/service/auth_service.go

@@ -210,6 +210,7 @@ func (auth *AuthService) CreateSessionCookie(c *gin.Context, data *config.Sessio
 		TOTPPending: data.TotpPending,
 		OAuthGroups: data.OAuthGroups,
 		Expiry:      time.Now().Add(time.Duration(expiry) * time.Second).Unix(),
+		OAuthName:   data.OAuthName,
 	}
 
 	err = auth.database.Create(&session).Error
@@ -278,6 +279,7 @@ func (auth *AuthService) GetSessionCookie(c *gin.Context) (config.SessionCookie,
 		Provider:    session.Provider,
 		TotpPending: session.TOTPPending,
 		OAuthGroups: session.OAuthGroups,
+		OAuthName:   session.OAuthName,
 	}, nil
 }
 

internal/service/generic_oauth_service.go

@@ -22,6 +22,7 @@ type GenericOAuthService struct {
 	verifier           string
 	insecureSkipVerify bool
 	userinfoUrl        string
+	name               string
 }
 
 func NewGenericOAuthService(config config.OAuthServiceConfig) *GenericOAuthService {
@@ -38,6 +39,7 @@ func NewGenericOAuthService(config config.OAuthServiceConfig) *GenericOAuthServi
 		},
 		insecureSkipVerify: config.InsecureSkipVerify,
 		userinfoUrl:        config.UserinfoURL,
+		name:               config.Name,
 	}
 }
 
@@ -115,3 +117,7 @@ func (generic *GenericOAuthService) Userinfo() (config.Claims, error) {
 
 	return user, nil
 }
+
+func (generic *GenericOAuthService) GetName() string {
+	return generic.name
+}

internal/service/github_oauth_service.go

@@ -33,6 +33,7 @@ type GithubOAuthService struct {
 	context  context.Context
 	token    *oauth2.Token
 	verifier string
+	name     string
 }
 
 func NewGithubOAuthService(config config.OAuthServiceConfig) *GithubOAuthService {
@@ -44,6 +45,7 @@ func NewGithubOAuthService(config config.OAuthServiceConfig) *GithubOAuthService
 			Scopes:       GithubOAuthScopes,
 			Endpoint:     endpoints.GitHub,
 		},
+		name: config.Name,
 	}
 }
 
@@ -167,3 +169,7 @@ func (github *GithubOAuthService) Userinfo() (config.Claims, error) {
 
 	return user, nil
 }
+
+func (github *GithubOAuthService) GetName() string {
+	return github.name
+}

internal/service/google_oauth_service.go

@@ -28,6 +28,7 @@ type GoogleOAuthService struct {
 	context  context.Context
 	token    *oauth2.Token
 	verifier string
+	name     string
 }
 
 func NewGoogleOAuthService(config config.OAuthServiceConfig) *GoogleOAuthService {
@@ -39,6 +40,7 @@ func NewGoogleOAuthService(config config.OAuthServiceConfig) *GoogleOAuthService
 			Scopes:       GoogleOAuthScopes,
 			Endpoint:     endpoints.Google,
 		},
+		name: config.Name,
 	}
 }
 
@@ -111,3 +113,7 @@ func (google *GoogleOAuthService) Userinfo() (config.Claims, error) {
 
 	return user, nil
 }
+
+func (google *GoogleOAuthService) GetName() string {
+	return google.name
+}

internal/service/oauth_broker_service.go

@@ -14,6 +14,7 @@ type OAuthService interface {
 	GetAuthURL(state string) string
 	VerifyCode(code string) error
 	Userinfo() (config.Claims, error)
+	GetName() string
 }
 
 type OAuthBrokerService struct {

internal/utils/app_utils.go

@@ -6,6 +6,9 @@ import (
 	"net/url"
 	"strings"
 	"tinyauth/internal/config"
+	"tinyauth/internal/utils/decoders"
+
+	"maps"
 
 	"github.com/gin-gonic/gin"
 	"github.com/rs/zerolog"
@@ -130,3 +133,66 @@ func GetLogLevel(level string) zerolog.Level {
 		return zerolog.InfoLevel
 	}
 }
+
+func GetOAuthProvidersConfig(env []string, args []string, appUrl string) (map[string]config.OAuthServiceConfig, error) {
+	providers := make(map[string]config.OAuthServiceConfig)
+
+	// Get from environment variables
+	envMap := make(map[string]string)
+
+	for _, e := range env {
+		pair := strings.SplitN(e, "=", 2)
+		envMap[pair[0]] = pair[1]
+	}
+
+	envProviders, err := decoders.DecodeEnv(envMap)
+
+	if err != nil {
+		return nil, err
+	}
+
+	maps.Copy(providers, envProviders.Providers)
+
+	// Get from flags
+	flagsMap := make(map[string]string)
+
+	for _, arg := range args[1:] {
+		if strings.HasPrefix(arg, "--") {
+			pair := strings.SplitN(arg[2:], "=", 2)
+			if len(pair) == 2 {
+				flagsMap[pair[0]] = pair[1]
+			}
+		}
+	}
+
+	flagProviders, err := decoders.DecodeFlags(flagsMap)
+
+	if err != nil {
+		return nil, err
+	}
+
+	maps.Copy(providers, flagProviders.Providers)
+
+	// For every provider get correct secret from file if set
+	for name, provider := range providers {
+		secret := GetSecret(provider.ClientSecret, provider.ClientSecretFile)
+		provider.ClientSecret = secret
+		provider.ClientSecretFile = ""
+		providers[name] = provider
+	}
+
+	// If we have google/github providers and no redirect URL babysit them
+	babysitProviders := []string{"google", "github"}
+
+	for _, name := range babysitProviders {
+		if provider, exists := providers[name]; exists {
+			if provider.RedirectURL == "" {
+				provider.RedirectURL = appUrl + "/api/oauth/callback/" + name
+				providers[name] = provider
+			}
+		}
+	}
+
+	// Return combined providers
+	return providers, nil
+}

internal/utils/app_utils_test.go

@@ -1,6 +1,7 @@
 package utils_test
 
 import (
+	"os"
 	"testing"
 	"tinyauth/internal/config"
 	"tinyauth/internal/utils"
@@ -200,3 +201,71 @@ func TestIsRedirectSafe(t *testing.T) {
 	result = utils.IsRedirectSafe(redirectURL, domain)
 	assert.Equal(t, false, result)
 }
+
+func TestGetOAuthProvidersConfig(t *testing.T) {
+	env := []string{"PROVIDERS_CLIENT1_CLIENT_ID=client1-id", "PROVIDERS_CLIENT1_CLIENT_SECRET=client1-secret"}
+	args := []string{"/tinyauth/tinyauth", "--providers-client2-client-id=client2-id", "--providers-client2-client-secret=client2-secret"}
+
+	expected := map[string]config.OAuthServiceConfig{
+		"client1": {
+			ClientID:     "client1-id",
+			ClientSecret: "client1-secret",
+		},
+		"client2": {
+			ClientID:     "client2-id",
+			ClientSecret: "client2-secret",
+		},
+	}
+
+	result, err := utils.GetOAuthProvidersConfig(env, args, "")
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, result)
+
+	// Case with no providers
+	env = []string{}
+	args = []string{"/tinyauth/tinyauth"}
+	expected = map[string]config.OAuthServiceConfig{}
+
+	result, err = utils.GetOAuthProvidersConfig(env, args, "")
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, result)
+
+	// Case with secret from file
+	file, err := os.Create("/tmp/tinyauth_test_file")
+	assert.NilError(t, err)
+
+	_, err = file.WriteString("file content\n")
+	assert.NilError(t, err)
+
+	err = file.Close()
+	assert.NilError(t, err)
+	defer os.Remove("/tmp/tinyauth_test_file")
+
+	env = []string{"PROVIDERS_CLIENT1_CLIENT_ID=client1-id", "PROVIDERS_CLIENT1_CLIENT_SECRET_FILE=/tmp/tinyauth_test_file"}
+	args = []string{"/tinyauth/tinyauth"}
+	expected = map[string]config.OAuthServiceConfig{
+		"client1": {
+			ClientID:     "client1-id",
+			ClientSecret: "file content",
+		},
+	}
+
+	result, err = utils.GetOAuthProvidersConfig(env, args, "")
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, result)
+
+	// Case with google provider and no redirect URL
+	env = []string{"PROVIDERS_GOOGLE_CLIENT_ID=google-id", "PROVIDERS_GOOGLE_CLIENT_SECRET=google-secret"}
+	args = []string{"/tinyauth/tinyauth"}
+	expected = map[string]config.OAuthServiceConfig{
+		"google": {
+			ClientID:     "google-id",
+			ClientSecret: "google-secret",
+			RedirectURL:  "http://app.url/api/oauth/callback/google",
+		},
+	}
+
+	result, err = utils.GetOAuthProvidersConfig(env, args, "http://app.url")
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, result)
+}

internal/utils/decoders/env_decoder.go

@@ -0,0 +1,137 @@
+package decoders
+
+import (
+	"fmt"
+	"slices"
+	"sort"
+	"strings"
+	"tinyauth/internal/config"
+
+	"github.com/traefik/paerser/parser"
+)
+
+// Based on https://github.com/traefik/paerser/blob/master/parser/labels_decode.go
+
+func DecodeEnv(env map[string]string) (config.Providers, error) {
+	normalized := normalizeEnv(env, "tinyauth")
+
+	node, err := decodeEnvsToNode(normalized, "tinyauth", "tinyauth_providers")
+
+	if err != nil {
+		return config.Providers{}, err
+	}
+
+	var providers config.Providers
+
+	metaOpts := parser.MetadataOpts{TagName: "env", AllowSliceAsStruct: true}
+
+	err = parser.AddMetadata(&providers, node, metaOpts)
+
+	if err != nil {
+		return config.Providers{}, err
+	}
+
+	err = parser.Fill(&providers, node, parser.FillerOpts{AllowSliceAsStruct: true})
+
+	if err != nil {
+		return config.Providers{}, err
+	}
+
+	return providers, nil
+}
+
+func decodeEnvsToNode(env map[string]string, rootName string, filters ...string) (*parser.Node, error) {
+	sorted := sortEnvKeys(env, filters)
+
+	var node *parser.Node
+
+	for i, k := range sorted {
+		split := strings.SplitN(k, "_", 4) // Something like PROVIDERS_MY_AWESOME_CLIENT is not supported because it will confuse the parser
+
+		if split[0] != rootName {
+			return nil, fmt.Errorf("invalid env root %s", split[0])
+		}
+
+		if slices.Contains(split, "") {
+			return nil, fmt.Errorf("invalid element: %s", k)
+		}
+
+		if i == 0 {
+			node = &parser.Node{}
+		}
+
+		decodeEnvToNode(node, split, env[k])
+	}
+
+	return node, nil
+}
+
+func decodeEnvToNode(root *parser.Node, path []string, value string) {
+	if len(root.Name) == 0 {
+		root.Name = path[0]
+	}
+
+	if len(path) <= 1 {
+		root.Value = value
+		return
+	}
+
+	if n := containsEnvNode(root.Children, path[1]); n != nil {
+		decodeEnvToNode(n, path[1:], value)
+		return
+	}
+
+	child := &parser.Node{Name: path[1]}
+	decodeEnvToNode(child, path[1:], value)
+	root.Children = append(root.Children, child)
+}
+
+func containsEnvNode(node []*parser.Node, name string) *parser.Node {
+	for _, n := range node {
+		if strings.EqualFold(n.Name, name) {
+			return n
+		}
+	}
+	return nil
+}
+
+func sortEnvKeys(env map[string]string, filters []string) []string {
+	var sorted []string
+
+	for k := range env {
+		if len(filters) == 0 {
+			sorted = append(sorted, k)
+			continue
+		}
+
+		for _, f := range filters {
+			if strings.HasPrefix(k, f) {
+				sorted = append(sorted, k)
+				break
+			}
+		}
+	}
+
+	sort.Strings(sorted)
+	return sorted
+}
+
+// normalizeEnv converts env vars from PROVIDERS_CLIENT1_CLIENT_ID to tinyauth_providers_client_clientId
+func normalizeEnv(env map[string]string, rootName string) map[string]string {
+	n := make(map[string]string)
+	for k, v := range env {
+		fk := strings.ToLower(k)
+		fks := strings.SplitN(fk, "_", 3)
+		fkb := ""
+		for i, s := range strings.Split(fks[len(fks)-1], "_") {
+			if i == 0 {
+				fkb += s
+				continue
+			}
+			fkb += strings.ToUpper(string([]rune(s)[0])) + string([]rune(s)[1:])
+		}
+		fk = rootName + "_" + strings.Join(fks[:len(fks)-1], "_") + "_" + fkb
+		n[fk] = v
+	}
+	return n
+}

internal/utils/decoders/env_decoder_test.go

@@ -0,0 +1,60 @@
+package decoders_test
+
+import (
+	"testing"
+	"tinyauth/internal/config"
+	"tinyauth/internal/utils/decoders"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestDecodeEnv(t *testing.T) {
+	// Variables
+	expected := config.Providers{
+		Providers: map[string]config.OAuthServiceConfig{
+			"client1": {
+				ClientID:           "client1-id",
+				ClientSecret:       "client1-secret",
+				Scopes:             []string{"client1-scope1", "client1-scope2"},
+				RedirectURL:        "client1-redirect-url",
+				AuthURL:            "client1-auth-url",
+				UserinfoURL:        "client1-user-info-url",
+				Name:               "Client1",
+				InsecureSkipVerify: false,
+			},
+			"client2": {
+				ClientID:           "client2-id",
+				ClientSecret:       "client2-secret",
+				Scopes:             []string{"client2-scope1", "client2-scope2"},
+				RedirectURL:        "client2-redirect-url",
+				AuthURL:            "client2-auth-url",
+				UserinfoURL:        "client2-user-info-url",
+				Name:               "My Awesome Client2",
+				InsecureSkipVerify: false,
+			},
+		},
+	}
+	test := map[string]string{
+		"PROVIDERS_CLIENT1_CLIENT_ID":            "client1-id",
+		"PROVIDERS_CLIENT1_CLIENT_SECRET":        "client1-secret",
+		"PROVIDERS_CLIENT1_SCOPES":               "client1-scope1,client1-scope2",
+		"PROVIDERS_CLIENT1_REDIRECT_URL":         "client1-redirect-url",
+		"PROVIDERS_CLIENT1_AUTH_URL":             "client1-auth-url",
+		"PROVIDERS_CLIENT1_USER_INFO_URL":        "client1-user-info-url",
+		"PROVIDERS_CLIENT1_NAME":                 "Client1",
+		"PROVIDERS_CLIENT1_INSECURE_SKIP_VERIFY": "false",
+		"PROVIDERS_CLIENT2_CLIENT_ID":            "client2-id",
+		"PROVIDERS_CLIENT2_CLIENT_SECRET":        "client2-secret",
+		"PROVIDERS_CLIENT2_SCOPES":               "client2-scope1,client2-scope2",
+		"PROVIDERS_CLIENT2_REDIRECT_URL":         "client2-redirect-url",
+		"PROVIDERS_CLIENT2_AUTH_URL":             "client2-auth-url",
+		"PROVIDERS_CLIENT2_USER_INFO_URL":        "client2-user-info-url",
+		"PROVIDERS_CLIENT2_NAME":                 "My Awesome Client2",
+		"PROVIDERS_CLIENT2_INSECURE_SKIP_VERIFY": "false",
+	}
+
+	// Test
+	res, err := decoders.DecodeEnv(test)
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, res)
+}

internal/utils/decoders/flags_decoder.go

@@ -0,0 +1,137 @@
+package decoders
+
+import (
+	"fmt"
+	"slices"
+	"sort"
+	"strings"
+	"tinyauth/internal/config"
+
+	"github.com/traefik/paerser/parser"
+)
+
+// Based on https://github.com/traefik/paerser/blob/master/parser/labels_decode.go
+
+func DecodeFlags(flags map[string]string) (config.Providers, error) {
+	normalized := normalizeFlags(flags, "tinyauth")
+
+	node, err := decodeFlagsToNode(normalized, "tinyauth", "tinyauth_providers")
+
+	if err != nil {
+		return config.Providers{}, err
+	}
+
+	var providers config.Providers
+
+	metaOpts := parser.MetadataOpts{TagName: "flag", AllowSliceAsStruct: true}
+
+	err = parser.AddMetadata(&providers, node, metaOpts)
+
+	if err != nil {
+		return config.Providers{}, err
+	}
+
+	err = parser.Fill(&providers, node, parser.FillerOpts{AllowSliceAsStruct: true})
+
+	if err != nil {
+		return config.Providers{}, err
+	}
+
+	return providers, nil
+}
+
+func decodeFlagsToNode(flags map[string]string, rootName string, filters ...string) (*parser.Node, error) {
+	sorted := sortFlagKeys(flags, filters)
+
+	var node *parser.Node
+
+	for i, k := range sorted {
+		split := strings.SplitN(k, "_", 4) // Something like --providers-my-awesome-client is not supported because it will confuse the parser
+
+		if split[0] != rootName {
+			return nil, fmt.Errorf("invalid flag root %s", split[0])
+		}
+
+		if slices.Contains(split, "") {
+			return nil, fmt.Errorf("invalid element: %s", k)
+		}
+
+		if i == 0 {
+			node = &parser.Node{}
+		}
+
+		decodeFlagToNode(node, split, flags[k])
+	}
+
+	return node, nil
+}
+
+func decodeFlagToNode(root *parser.Node, path []string, value string) {
+	if len(root.Name) == 0 {
+		root.Name = path[0]
+	}
+
+	if len(path) <= 1 {
+		root.Value = value
+		return
+	}
+
+	if n := containsFlagNode(root.Children, path[1]); n != nil {
+		decodeFlagToNode(n, path[1:], value)
+		return
+	}
+
+	child := &parser.Node{Name: path[1]}
+	decodeFlagToNode(child, path[1:], value)
+	root.Children = append(root.Children, child)
+}
+
+func containsFlagNode(node []*parser.Node, name string) *parser.Node {
+	for _, n := range node {
+		if strings.EqualFold(n.Name, name) {
+			return n
+		}
+	}
+	return nil
+}
+
+func sortFlagKeys(flags map[string]string, filters []string) []string {
+	var sorted []string
+
+	for k := range flags {
+		if len(filters) == 0 {
+			sorted = append(sorted, k)
+			continue
+		}
+
+		for _, f := range filters {
+			if strings.HasPrefix(k, f) {
+				sorted = append(sorted, k)
+				break
+			}
+		}
+	}
+
+	sort.Strings(sorted)
+	return sorted
+}
+
+// normalizeFlags converts flags from --providers-client-client-id to tinyauth_providers_client_clientId
+func normalizeFlags(flags map[string]string, rootName string) map[string]string {
+	n := make(map[string]string)
+	for k, v := range flags {
+		fk := strings.TrimPrefix(k, "--")
+		fks := strings.SplitN(fk, "-", 3)
+		fkb := ""
+		for i, s := range strings.Split(fks[len(fks)-1], "-") {
+			if i == 0 {
+				fkb += s
+				continue
+			}
+			fkb += strings.ToUpper(string([]rune(s)[0])) + string([]rune(s)[1:])
+		}
+		fk = rootName + "_" + strings.Join(fks[:len(fks)-1], "_") + "_" + fkb
+		n[fk] = v
+	}
+	return n
+}

internal/utils/decoders/flags_decoder_test.go

@@ -0,0 +1,60 @@
+package decoders_test
+
+import (
+	"testing"
+	"tinyauth/internal/config"
+	"tinyauth/internal/utils/decoders"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestDecodeFlags(t *testing.T) {
+	// Variables
+	expected := config.Providers{
+		Providers: map[string]config.OAuthServiceConfig{
+			"client1": {
+				ClientID:           "client1-id",
+				ClientSecret:       "client1-secret",
+				Scopes:             []string{"client1-scope1", "client1-scope2"},
+				RedirectURL:        "client1-redirect-url",
+				AuthURL:            "client1-auth-url",
+				UserinfoURL:        "client1-user-info-url",
+				Name:               "Client1",
+				InsecureSkipVerify: false,
+			},
+			"client2": {
+				ClientID:           "client2-id",
+				ClientSecret:       "client2-secret",
+				Scopes:             []string{"client2-scope1", "client2-scope2"},
+				RedirectURL:        "client2-redirect-url",
+				AuthURL:            "client2-auth-url",
+				UserinfoURL:        "client2-user-info-url",
+				Name:               "My Awesome Client2",
+				InsecureSkipVerify: false,
+			},
+		},
+	}
+	test := map[string]string{
+		"--providers-client1-client-id":            "client1-id",
+		"--providers-client1-client-secret":        "client1-secret",
+		"--providers-client1-scopes":               "client1-scope1,client1-scope2",
+		"--providers-client1-redirect-url":         "client1-redirect-url",
+		"--providers-client1-auth-url":             "client1-auth-url",
+		"--providers-client1-user-info-url":        "client1-user-info-url",
+		"--providers-client1-name":                 "Client1",
+		"--providers-client1-insecure-skip-verify": "false",
+		"--providers-client2-client-id":            "client2-id",
+		"--providers-client2-client-secret":        "client2-secret",
+		"--providers-client2-scopes":               "client2-scope1,client2-scope2",
+		"--providers-client2-redirect-url":         "client2-redirect-url",
+		"--providers-client2-auth-url":             "client2-auth-url",
+		"--providers-client2-user-info-url":        "client2-user-info-url",
+		"--providers-client2-name":                 "My Awesome Client2",
+		"--providers-client2-insecure-skip-verify": "false",
+	}
+
+	// Test
+	res, err := decoders.DecodeFlags(test)
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, res)
+}

internal/utils/decoders/label_decoder_test.go

@@ -1,10 +1,11 @@
 package decoders_test
 
 import (
-	"reflect"
 	"testing"
 	"tinyauth/internal/config"
 	"tinyauth/internal/utils/decoders"
+
+	"gotest.tools/v3/assert"
 )
 
 func TestDecodeLabels(t *testing.T) {
@@ -62,12 +63,6 @@ func TestDecodeLabels(t *testing.T) {
 
 	// Test
 	result, err := decoders.DecodeLabels(test)
-
-	if err != nil {
-		t.Fatalf("Unexpected error: %v", err)
-	}
-
-	if reflect.DeepEqual(expected, result) == false {
-		t.Fatalf("Expected %v but got %v", expected, result)
-	}
+	assert.NilError(t, err)
+	assert.DeepEqual(t, expected, result)
 }