refactor: rework decoders logic for cleaner code (#431)

* refactor: rework decoders logic for cleaner code

* refactor: use strcase lib to handle text case conversions

go.mod

@@ -47,6 +47,7 @@ require (
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/quic-go/quic-go v0.54.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/stoewer/go-strcase v1.3.1 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.34.0 // indirect

go.sum

@@ -259,6 +259,8 @@ github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
 github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.21.0 h1:x5S+0EU27Lbphp4UKm1C+1oQO+rKx36vfCoaVebLFSU=
 github.com/spf13/viper v1.21.0/go.mod h1:P0lhsswPGWD/1lZJ9ny3fYnVqxiegrlNrEmgLjbTCAY=
+github.com/stoewer/go-strcase v1.3.1 h1:iS0MdW+kVTxgMoE1LAZyMiYJFKlOzLooE4MxjirtkAs=
+github.com/stoewer/go-strcase v1.3.1/go.mod h1:fAH5hQ5pehh+j3nZfvwdk2RgEgQjAoM8wodgtPmh1xo=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=

internal/bootstrap/app_bootstrap.go

@@ -139,12 +139,14 @@ func (app *BootstrapApp) Setup() error {
 
 	// Create services
 	dockerService := service.NewDockerService()
+	aclsService := service.NewAccessControlsService(dockerService)
 	authService := service.NewAuthService(authConfig, dockerService, ldapService, database)
 	oauthBrokerService := service.NewOAuthBrokerService(oauthProviders)
 
-	// Initialize services
+	// Initialize services (order matters)
 	services := []Service{
 		dockerService,
+		aclsService,
 		authService,
 		oauthBrokerService,
 	}
@@ -246,7 +248,7 @@ func (app *BootstrapApp) Setup() error {
 
 	proxyController := controller.NewProxyController(controller.ProxyControllerConfig{
 		AppURL: app.config.AppURL,
-	}, apiRouter, dockerService, authService)
+	}, apiRouter, aclsService, authService)
 
 	userController := controller.NewUserController(controller.UserControllerConfig{
 		CookieDomain: cookieDomain,

internal/config/config.go

@@ -53,16 +53,16 @@ type Claims struct {
 }
 
 type OAuthServiceConfig struct {
-	ClientID           string   `key:"client-id"`
-	ClientSecret       string   `key:"client-secret"`
-	ClientSecretFile   string   `key:"client-secret-file"`
-	Scopes             []string `key:"scopes"`
-	RedirectURL        string   `key:"redirect-url"`
-	AuthURL            string   `key:"auth-url"`
-	TokenURL           string   `key:"token-url"`
-	UserinfoURL        string   `key:"user-info-url"`
-	InsecureSkipVerify bool     `key:"insecure-skip-verify"`
-	Name               string   `key:"name"`
+	ClientID           string `field:"client-id"`
+	ClientSecret       string
+	ClientSecretFile   string
+	Scopes             []string
+	RedirectURL        string `field:"redirect-url"`
+	AuthURL            string `field:"auth-url"`
+	TokenURL           string `field:"token-url"`
+	UserinfoURL        string `field:"user-info-url"`
+	InsecureSkipVerify bool
+	Name               string
 }
 
 var OverrideProviders = map[string]string{

internal/controller/proxy_controller.go

@@ -24,15 +24,15 @@ type ProxyControllerConfig struct {
 type ProxyController struct {
 	config ProxyControllerConfig
 	router *gin.RouterGroup
-	docker *service.DockerService
+	acls   *service.AccessControlsService
 	auth   *service.AuthService
 }
 
-func NewProxyController(config ProxyControllerConfig, router *gin.RouterGroup, docker *service.DockerService, auth *service.AuthService) *ProxyController {
+func NewProxyController(config ProxyControllerConfig, router *gin.RouterGroup, acls *service.AccessControlsService, auth *service.AuthService) *ProxyController {
 	return &ProxyController{
 		config: config,
 		router: router,
-		docker: docker,
+		acls:   acls,
 		auth:   auth,
 	}
 }
@@ -76,20 +76,21 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 	proto := c.Request.Header.Get("X-Forwarded-Proto")
 	host := c.Request.Header.Get("X-Forwarded-Host")
 
-	labels, err := controller.docker.GetLabels(host)
+	// Get acls
+	acls, err := controller.acls.GetAccessControls(host)
 
 	if err != nil {
-		log.Error().Err(err).Msg("Failed to get labels from Docker")
+		log.Error().Err(err).Msg("Failed to get access controls for resource")
 		controller.handleError(c, req, isBrowser)
 		return
 	}
 
-	log.Trace().Interface("labels", labels).Msg("Labels for resource")
+	log.Trace().Interface("acls", acls).Msg("ACLs for resource")
 
 	clientIP := c.ClientIP()
 
-	if controller.auth.IsBypassedIP(labels.IP, clientIP) {
-		controller.setHeaders(c, labels)
+	if controller.auth.IsBypassedIP(acls.IP, clientIP) {
+		controller.setHeaders(c, acls)
 		c.JSON(200, gin.H{
 			"status":  200,
 			"message": "Authenticated",
@@ -97,7 +98,7 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 		return
 	}
 
-	authEnabled, err := controller.auth.IsAuthEnabled(uri, labels.Path)
+	authEnabled, err := controller.auth.IsAuthEnabled(uri, acls.Path)
 
 	if err != nil {
 		log.Error().Err(err).Msg("Failed to check if auth is enabled for resource")
@@ -107,7 +108,7 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 
 	if !authEnabled {
 		log.Debug().Msg("Authentication disabled for resource, allowing access")
-		controller.setHeaders(c, labels)
+		controller.setHeaders(c, acls)
 		c.JSON(200, gin.H{
 			"status":  200,
 			"message": "Authenticated",
@@ -115,7 +116,7 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 		return
 	}
 
-	if !controller.auth.CheckIP(labels.IP, clientIP) {
+	if !controller.auth.CheckIP(acls.IP, clientIP) {
 		if req.Proxy == "nginx" || !isBrowser {
 			c.JSON(401, gin.H{
 				"status":  401,
@@ -160,7 +161,7 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 	}
 
 	if userContext.IsLoggedIn {
-		appAllowed := controller.auth.IsResourceAllowed(c, userContext, labels)
+		appAllowed := controller.auth.IsResourceAllowed(c, userContext, acls)
 
 		if !appAllowed {
 			log.Warn().Str("user", userContext.Username).Str("resource", strings.Split(host, ".")[0]).Msg("User not allowed to access resource")
@@ -194,7 +195,7 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 		}
 
 		if userContext.OAuth {
-			groupOK := controller.auth.IsInOAuthGroup(c, userContext, labels.OAuth.Groups)
+			groupOK := controller.auth.IsInOAuthGroup(c, userContext, acls.OAuth.Groups)
 
 			if !groupOK {
 				log.Warn().Str("user", userContext.Username).Str("resource", strings.Split(host, ".")[0]).Msg("User OAuth groups do not match resource requirements")
@@ -234,7 +235,7 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 		c.Header("Remote-Email", utils.SanitizeHeader(userContext.Email))
 		c.Header("Remote-Groups", utils.SanitizeHeader(userContext.OAuthGroups))
 
-		controller.setHeaders(c, labels)
+		controller.setHeaders(c, acls)
 
 		c.JSON(200, gin.H{
 			"status":  200,
@@ -264,21 +265,21 @@ func (controller *ProxyController) proxyHandler(c *gin.Context) {
 	c.Redirect(http.StatusTemporaryRedirect, fmt.Sprintf("%s/login?%s", controller.config.AppURL, queries.Encode()))
 }
 
-func (controller *ProxyController) setHeaders(c *gin.Context, labels config.App) {
+func (controller *ProxyController) setHeaders(c *gin.Context, acls config.App) {
 	c.Header("Authorization", c.Request.Header.Get("Authorization"))
 
-	headers := utils.ParseHeaders(labels.Response.Headers)
+	headers := utils.ParseHeaders(acls.Response.Headers)
 
 	for key, value := range headers {
 		log.Debug().Str("header", key).Msg("Setting header")
 		c.Header(key, value)
 	}
 
-	basicPassword := utils.GetSecret(labels.Response.BasicAuth.Password, labels.Response.BasicAuth.PasswordFile)
+	basicPassword := utils.GetSecret(acls.Response.BasicAuth.Password, acls.Response.BasicAuth.PasswordFile)
 
-	if labels.Response.BasicAuth.Username != "" && basicPassword != "" {
-		log.Debug().Str("username", labels.Response.BasicAuth.Username).Msg("Setting basic auth header")
-		c.Header("Authorization", fmt.Sprintf("Basic %s", utils.GetBasicAuth(labels.Response.BasicAuth.Username, basicPassword)))
+	if acls.Response.BasicAuth.Username != "" && basicPassword != "" {
+		log.Debug().Str("username", acls.Response.BasicAuth.Username).Msg("Setting basic auth header")
+		c.Header("Authorization", fmt.Sprintf("Basic %s", utils.GetBasicAuth(acls.Response.BasicAuth.Username, basicPassword)))
 	}
 }
 

internal/controller/proxy_controller_test.go

@@ -39,6 +39,11 @@ func setupProxyController(t *testing.T, middlewares *[]gin.HandlerFunc) (*gin.En
 
 	assert.NilError(t, dockerService.Init())
 
+	// Access controls
+	accessControlsService := service.NewAccessControlsService(dockerService)
+
+	assert.NilError(t, accessControlsService.Init())
+
 	// Auth service
 	authService := service.NewAuthService(service.AuthServiceConfig{
 		Users: []config.User{
@@ -59,7 +64,7 @@ func setupProxyController(t *testing.T, middlewares *[]gin.HandlerFunc) (*gin.En
 	// Controller
 	ctrl := controller.NewProxyController(controller.ProxyControllerConfig{
 		AppURL: "http://localhost:8080",
-	}, group, dockerService, authService)
+	}, group, accessControlsService, authService)
 	ctrl.SetupRoutes()
 
 	return router, recorder, authService

internal/service/access_controls_service.go

@@ -0,0 +1,103 @@
+package service
+
+import (
+	"os"
+	"strings"
+	"tinyauth/internal/config"
+	"tinyauth/internal/utils/decoders"
+
+	"github.com/rs/zerolog/log"
+)
+
+type AccessControlsService struct {
+	docker  *DockerService
+	envACLs config.Apps
+}
+
+func NewAccessControlsService(docker *DockerService) *AccessControlsService {
+	return &AccessControlsService{
+		docker: docker,
+	}
+}
+
+func (acls *AccessControlsService) Init() error {
+	acls.envACLs = config.Apps{}
+	env := os.Environ()
+	appEnvVars := []string{}
+
+	for _, e := range env {
+		if strings.HasPrefix(e, "TINYAUTH_APPS_") {
+			appEnvVars = append(appEnvVars, e)
+		}
+	}
+
+	err := acls.loadEnvACLs(appEnvVars)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (acls *AccessControlsService) loadEnvACLs(appEnvVars []string) error {
+	if len(appEnvVars) == 0 {
+		return nil
+	}
+
+	envAcls := map[string]string{}
+
+	for _, e := range appEnvVars {
+		parts := strings.SplitN(e, "=", 2)
+		if len(parts) != 2 {
+			continue
+		}
+
+		// Normalize key, this should use the same normalization logic as in utils/decoders/decoders.go
+		key := parts[0]
+		key = strings.ToLower(key)
+		key = strings.ReplaceAll(key, "_", ".")
+		value := parts[1]
+		envAcls[key] = value
+	}
+
+	apps, err := decoders.DecodeLabels(envAcls)
+
+	if err != nil {
+		return err
+	}
+
+	acls.envACLs = apps
+	return nil
+}
+
+func (acls *AccessControlsService) lookupEnvACLs(appDomain string) *config.App {
+	if len(acls.envACLs.Apps) == 0 {
+		return nil
+	}
+
+	for appName, appACLs := range acls.envACLs.Apps {
+		if appACLs.Config.Domain == appDomain {
+			return &appACLs
+		}
+
+		if strings.SplitN(appDomain, ".", 2)[0] == appName {
+			return &appACLs
+		}
+	}
+
+	return nil
+}
+
+func (acls *AccessControlsService) GetAccessControls(appDomain string) (config.App, error) {
+	// First check environment variables
+	envACLs := acls.lookupEnvACLs(appDomain)
+
+	if envACLs != nil {
+		log.Debug().Str("domain", appDomain).Msg("Found matching access controls in environment variables")
+		return *envACLs, nil
+	}
+
+	// Fallback to Docker labels
+	return acls.docker.GetLabels(appDomain)
+}

internal/service/auth_service.go

@@ -289,21 +289,21 @@ func (auth *AuthService) UserAuthConfigured() bool {
 	return len(auth.config.Users) > 0 || auth.ldap != nil
 }
 
-func (auth *AuthService) IsResourceAllowed(c *gin.Context, context config.UserContext, labels config.App) bool {
+func (auth *AuthService) IsResourceAllowed(c *gin.Context, context config.UserContext, acls config.App) bool {
 	if context.OAuth {
 		log.Debug().Msg("Checking OAuth whitelist")
-		return utils.CheckFilter(labels.OAuth.Whitelist, context.Email)
+		return utils.CheckFilter(acls.OAuth.Whitelist, context.Email)
 	}
 
-	if labels.Users.Block != "" {
+	if acls.Users.Block != "" {
 		log.Debug().Msg("Checking blocked users")
-		if utils.CheckFilter(labels.Users.Block, context.Username) {
+		if utils.CheckFilter(acls.Users.Block, context.Username) {
 			return false
 		}
 	}
 
 	log.Debug().Msg("Checking users")
-	return utils.CheckFilter(labels.Users.Allow, context.Username)
+	return utils.CheckFilter(acls.Users.Allow, context.Username)
 }
 
 func (auth *AuthService) IsInOAuthGroup(c *gin.Context, context config.UserContext, requiredGroups string) bool {
@@ -371,8 +371,8 @@ func (auth *AuthService) GetBasicAuth(c *gin.Context) *config.User {
 	}
 }
 
-func (auth *AuthService) CheckIP(labels config.AppIP, ip string) bool {
-	for _, blocked := range labels.Block {
+func (auth *AuthService) CheckIP(acls config.AppIP, ip string) bool {
+	for _, blocked := range acls.Block {
 		res, err := utils.FilterIP(blocked, ip)
 		if err != nil {
 			log.Warn().Err(err).Str("item", blocked).Msg("Invalid IP/CIDR in block list")
@@ -384,7 +384,7 @@ func (auth *AuthService) CheckIP(labels config.AppIP, ip string) bool {
 		}
 	}
 
-	for _, allowed := range labels.Allow {
+	for _, allowed := range acls.Allow {
 		res, err := utils.FilterIP(allowed, ip)
 		if err != nil {
 			log.Warn().Err(err).Str("item", allowed).Msg("Invalid IP/CIDR in allow list")
@@ -396,7 +396,7 @@ func (auth *AuthService) CheckIP(labels config.AppIP, ip string) bool {
 		}
 	}
 
-	if len(labels.Allow) > 0 {
+	if len(acls.Allow) > 0 {
 		log.Debug().Str("ip", ip).Msg("IP not in allow list, denying access")
 		return false
 	}
@@ -405,8 +405,8 @@ func (auth *AuthService) CheckIP(labels config.AppIP, ip string) bool {
 	return true
 }
 
-func (auth *AuthService) IsBypassedIP(labels config.AppIP, ip string) bool {
-	for _, bypassed := range labels.Bypass {
+func (auth *AuthService) IsBypassedIP(acls config.AppIP, ip string) bool {
+	for _, bypassed := range acls.Bypass {
 		res, err := utils.FilterIP(bypassed, ip)
 		if err != nil {
 			log.Warn().Err(err).Str("item", bypassed).Msg("Invalid IP/CIDR in bypass list")

internal/utils/app_utils.go

@@ -147,7 +147,7 @@ func GetOAuthProvidersConfig(env []string, args []string, appUrl string) (map[st
 		}
 	}
 
-	envProviders, err := decoders.DecodeEnv(envMap)
+	envProviders, err := decoders.DecodeEnv[config.Providers, config.OAuthServiceConfig](envMap, "providers")
 
 	if err != nil {
 		return nil, err
@@ -167,7 +167,7 @@ func GetOAuthProvidersConfig(env []string, args []string, appUrl string) (map[st
 		}
 	}
 
-	flagProviders, err := decoders.DecodeFlags(flagsMap)
+	flagProviders, err := decoders.DecodeFlags[config.Providers, config.OAuthServiceConfig](flagsMap, "providers")
 
 	if err != nil {
 		return nil, err

internal/utils/decoders/decoders.go

@@ -3,29 +3,24 @@ package decoders
 import (
 	"reflect"
 	"strings"
-	"tinyauth/internal/config"
+
+	"github.com/stoewer/go-strcase"
 )
 
-func NormalizeKeys(keys map[string]string, rootName string, sep string) map[string]string {
+func normalizeKeys[T any](input map[string]string, root string, sep string) map[string]string {
+	knownKeys := getKnownKeys[T]()
 	normalized := make(map[string]string)
-	knownKeys := getKnownKeys()
 
-	for k, v := range keys {
-		var finalKey []string
-		var suffix string
-		var camelClientName string
-		var camelField string
+	for k, v := range input {
+		parts := []string{"tinyauth"}
 
-		finalKey = append(finalKey, rootName)
-		finalKey = append(finalKey, "providers")
-		lowerKey := strings.ToLower(k)
+		key := strings.ToLower(k)
+		key = strings.ReplaceAll(key, sep, "-")
 
-		if !strings.HasPrefix(lowerKey, "providers"+sep) {
-			continue
-		}
+		suffix := ""
 
 		for _, known := range knownKeys {
-			if strings.HasSuffix(lowerKey, strings.ReplaceAll(known, "-", sep)) {
+			if strings.HasSuffix(key, known) {
 				suffix = known
 				break
 			}
@@ -35,55 +30,47 @@ func NormalizeKeys(keys map[string]string, rootName string, sep string) map[stri
 			continue
 		}
 
-		if strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(lowerKey, "providers"+sep), strings.ReplaceAll(suffix, "-", sep))) == "" {
+		parts = append(parts, root)
+
+		id := strings.TrimPrefix(key, root+"-")
+		id = strings.TrimSuffix(id, "-"+suffix)
+
+		if id == "" {
 			continue
 		}
 
-		clientNameParts := strings.Split(strings.TrimPrefix(strings.TrimSuffix(lowerKey, sep+strings.ReplaceAll(suffix, "-", sep)), "providers"+sep), sep)
+		parts = append(parts, id)
+		parts = append(parts, suffix)
 
-		for i, p := range clientNameParts {
-			if i == 0 {
-				camelClientName += p
-				continue
+		final := ""
+
+		for i, part := range parts {
+			if i > 0 {
+				final += "."
 			}
-			if p == "" {
-				continue
-			}
-			camelClientName += strings.ToUpper(string([]rune(p)[0])) + string([]rune(p)[1:])
+			final += strcase.LowerCamelCase(part)
 		}
 
-		finalKey = append(finalKey, camelClientName)
-
-		fieldParts := strings.Split(suffix, "-")
-
-		for i, p := range fieldParts {
-			if i == 0 {
-				camelField += p
-				continue
-			}
-			if p == "" {
-				continue
-			}
-			camelField += strings.ToUpper(string([]rune(p)[0])) + string([]rune(p)[1:])
-		}
-
-		finalKey = append(finalKey, camelField)
-		normalized[strings.Join(finalKey, ".")] = v
+		normalized[final] = v
 	}
 
 	return normalized
 }
 
-func getKnownKeys() []string {
-	var known []string
+func getKnownKeys[T any]() []string {
+	var keys []string
+	var t T
 
-	p := config.OAuthServiceConfig{}
-	v := reflect.ValueOf(p)
-	typeOfP := v.Type()
+	v := reflect.ValueOf(t)
+	typeOfT := v.Type()
 
-	for field := range typeOfP.NumField() {
-		known = append(known, typeOfP.Field(field).Tag.Get("key"))
+	for field := range typeOfT.NumField() {
+		if typeOfT.Field(field).Tag.Get("field") != "" {
+			keys = append(keys, typeOfT.Field(field).Tag.Get("field"))
+			continue
+		}
+		keys = append(keys, strcase.KebabCase(typeOfT.Field(field).Name))
 	}
 
-	return known
+	return keys
 }

internal/utils/decoders/decoders_test.go

@@ -1,49 +0,0 @@
-package decoders_test
-
-import (
-	"testing"
-	"tinyauth/internal/utils/decoders"
-
-	"gotest.tools/v3/assert"
-)
-
-func TestNormalizeKeys(t *testing.T) {
-	// Test with env
-	test := map[string]string{
-		"PROVIDERS_CLIENT1_CLIENT_ID":                    "my-client-id",
-		"PROVIDERS_CLIENT1_CLIENT_SECRET":                "my-client-secret",
-		"PROVIDERS_MY_AWESOME_CLIENT_CLIENT_ID":          "my-awesome-client-id",
-		"PROVIDERS_MY_AWESOME_CLIENT_CLIENT_SECRET_FILE": "/path/to/secret",
-		"I_LOOK_LIKE_A_KEY_CLIENT_ID":                    "should-not-appear",
-		"PROVIDERS_CLIENT_ID":                            "should-not-appear",
-	}
-	expected := map[string]string{
-		"tinyauth.providers.client1.clientId":                 "my-client-id",
-		"tinyauth.providers.client1.clientSecret":             "my-client-secret",
-		"tinyauth.providers.myAwesomeClient.clientId":         "my-awesome-client-id",
-		"tinyauth.providers.myAwesomeClient.clientSecretFile": "/path/to/secret",
-	}
-
-	normalized := decoders.NormalizeKeys(test, "tinyauth", "_")
-	assert.DeepEqual(t, normalized, expected)
-
-	// Test with flags (assume -- is already stripped)
-	test = map[string]string{
-		"providers-client1-client-id":                    "my-client-id",
-		"providers-client1-client-secret":                "my-client-secret",
-		"providers-my-awesome-client-client-id":          "my-awesome-client-id",
-		"providers-my-awesome-client-client-secret-file": "/path/to/secret",
-		"providers-should-not-appear-client":             "should-not-appear",
-		"i-look-like-a-key-client-id":                    "should-not-appear",
-		"providers-client-id":                            "should-not-appear",
-	}
-	expected = map[string]string{
-		"tinyauth.providers.client1.clientId":                 "my-client-id",
-		"tinyauth.providers.client1.clientSecret":             "my-client-secret",
-		"tinyauth.providers.myAwesomeClient.clientId":         "my-awesome-client-id",
-		"tinyauth.providers.myAwesomeClient.clientSecretFile": "/path/to/secret",
-	}
-
-	normalized = decoders.NormalizeKeys(test, "tinyauth", "-")
-	assert.DeepEqual(t, normalized, expected)
-}

internal/utils/decoders/env_decoder.go

@@ -1,20 +1,19 @@
 package decoders
 
 import (
-	"tinyauth/internal/config"
-
 	"github.com/traefik/paerser/parser"
 )
 
-func DecodeEnv(env map[string]string) (config.Providers, error) {
-	normalized := NormalizeKeys(env, "tinyauth", "_")
-	var providers config.Providers
+func DecodeEnv[T any, C any](env map[string]string, subName string) (T, error) {
+	var result T
 
-	err := parser.Decode(normalized, &providers, "tinyauth", "tinyauth.providers")
+	normalized := normalizeKeys[C](env, subName, "_")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
 
 	if err != nil {
-		return config.Providers{}, err
+		return result, err
 	}
 
-	return providers, nil
+	return result, nil
 }

internal/utils/decoders/env_decoder_test.go

@@ -9,52 +9,29 @@ import (
 )
 
 func TestDecodeEnv(t *testing.T) {
-	// Variables
+	// Setup
+	env := map[string]string{
+		"PROVIDERS_GOOGLE_CLIENT_ID":        "google-client-id",
+		"PROVIDERS_GOOGLE_CLIENT_SECRET":    "google-client-secret",
+		"PROVIDERS_MY_GITHUB_CLIENT_ID":     "github-client-id",
+		"PROVIDERS_MY_GITHUB_CLIENT_SECRET": "github-client-secret",
+	}
+
 	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,
+			"google": {
+				ClientID:     "google-client-id",
+				ClientSecret: "google-client-secret",
 			},
-			"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,
+			"myGithub": {
+				ClientID:     "github-client-id",
+				ClientSecret: "github-client-secret",
 			},
 		},
 	}
-	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)
+	// Execute
+	result, err := decoders.DecodeEnv[config.Providers, config.OAuthServiceConfig](env, "providers")
 	assert.NilError(t, err)
-	assert.DeepEqual(t, expected, res)
+	assert.DeepEqual(t, result, expected)
 }

internal/utils/decoders/flags_decoder.go

@@ -2,23 +2,23 @@ package decoders
 
 import (
 	"strings"
-	"tinyauth/internal/config"
 
 	"github.com/traefik/paerser/parser"
 )
 
-func DecodeFlags(flags map[string]string) (config.Providers, error) {
-	filtered := filterFlags(flags)
-	normalized := NormalizeKeys(filtered, "tinyauth", "-")
-	var providers config.Providers
+func DecodeFlags[T any, C any](flags map[string]string, subName string) (T, error) {
+	var result T
 
-	err := parser.Decode(normalized, &providers, "tinyauth", "tinyauth.providers")
+	filtered := filterFlags(flags)
+	normalized := normalizeKeys[C](filtered, subName, "_")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
 
 	if err != nil {
-		return config.Providers{}, err
+		return result, err
 	}
 
-	return providers, nil
+	return result, nil
 }
 
 func filterFlags(flags map[string]string) map[string]string {

internal/utils/decoders/flags_decoder_test.go

@@ -9,52 +9,29 @@ import (
 )
 
 func TestDecodeFlags(t *testing.T) {
-	// Variables
+	// Setup
+	flags := map[string]string{
+		"--providers-google-client-id":        "google-client-id",
+		"--providers-google-client-secret":    "google-client-secret",
+		"--providers-my-github-client-id":     "github-client-id",
+		"--providers-my-github-client-secret": "github-client-secret",
+	}
+
 	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,
+			"google": {
+				ClientID:     "google-client-id",
+				ClientSecret: "google-client-secret",
 			},
-			"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,
+			"myGithub": {
+				ClientID:     "github-client-id",
+				ClientSecret: "github-client-secret",
 			},
 		},
 	}
-	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)
+	// Execute
+	result, err := decoders.DecodeFlags[config.Providers, config.OAuthServiceConfig](flags, "providers")
 	assert.NilError(t, err)
-	assert.DeepEqual(t, expected, res)
+	assert.DeepEqual(t, result, expected)
 }