feat: parse apps acl flags and env dynamically

internal/utils/decoders/acl_decoder_test.go

@@ -0,0 +1,92 @@
+package decoders_test
+
+import (
+	"testing"
+	"tinyauth/internal/config"
+	"tinyauth/internal/utils/decoders"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestDecodeACLEnv(t *testing.T) {
+	env := map[string]string{
+		"TINYAUTH_APPS_MY_COOL_APP_CONFIG_DOMAIN":   "example.com",
+		"TINYAUTH_APPS_MY_COOL_APP_USERS_ALLOW":     "user1,user2",
+		"TINYAUTH_APPS_MY_COOL_APP_USERS_BLOCK":     "user3",
+		"TINYAUTH_APPS_MY_COOL_APP_OAUTH_WHITELIST": "provider1",
+		"TINYAUTH_APPS_MY_COOL_APP_OAUTH_GROUPS":    "group1,group2",
+		"TINYAUTH_APPS_OTHERAPP_CONFIG_DOMAIN":      "test.com",
+		"TINYAUTH_APPS_OTHERAPP_USERS_ALLOW":        "admin",
+	}
+
+	expected := config.Apps{
+		Apps: map[string]config.App{
+			"my_cool_app": {
+				Config: config.AppConfig{
+					Domain: "example.com",
+				},
+				Users: config.AppUsers{
+					Allow: "user1,user2",
+					Block: "user3",
+				},
+				OAuth: config.AppOAuth{
+					Whitelist: "provider1",
+					Groups:    "group1,group2",
+				},
+			},
+			"otherapp": {
+				Config: config.AppConfig{
+					Domain: "test.com",
+				},
+				Users: config.AppUsers{
+					Allow: "admin",
+				},
+			},
+		},
+	}
+
+	// Execute
+	result, err := decoders.DecodeACLEnv[config.Apps](env, "apps")
+	assert.NilError(t, err)
+	assert.DeepEqual(t, result, expected)
+}
+
+func TestDecodeACLFlags(t *testing.T) {
+	// Setup
+	flags := map[string]string{
+		"tinyauth-apps-webapp-config-domain":   "webapp.example.com",
+		"tinyauth-apps-webapp-users-allow":     "alice,bob",
+		"tinyauth-apps-webapp-oauth-whitelist": "google",
+		"tinyauth-apps-api-config-domain":      "api.example.com",
+		"tinyauth-apps-api-users-block":        "banned",
+	}
+
+	expected := config.Apps{
+		Apps: map[string]config.App{
+			"webapp": {
+				Config: config.AppConfig{
+					Domain: "webapp.example.com",
+				},
+				Users: config.AppUsers{
+					Allow: "alice,bob",
+				},
+				OAuth: config.AppOAuth{
+					Whitelist: "google",
+				},
+			},
+			"api": {
+				Config: config.AppConfig{
+					Domain: "api.example.com",
+				},
+				Users: config.AppUsers{
+					Block: "banned",
+				},
+			},
+		},
+	}
+
+	// Execute
+	result, err := decoders.DecodeACLFlags[config.Apps](flags, "apps")
+	assert.NilError(t, err)
+	assert.DeepEqual(t, result, expected)
+}

internal/utils/decoders/decoders.go

@@ -7,6 +7,60 @@ import (
 	"github.com/stoewer/go-strcase"
 )
 
+func ParsePath(parts []string, idx int, t reflect.Type) []string {
+	if idx >= len(parts) {
+		return []string{}
+	}
+
+	if t.Kind() == reflect.Map {
+		mapName := strings.ToLower(parts[idx])
+
+		if idx+1 >= len(parts) {
+			return []string{mapName}
+		}
+
+		elemType := t.Elem()
+		keyEndIdx := idx + 1
+
+		if elemType.Kind() == reflect.Struct {
+			for i := idx + 1; i < len(parts); i++ {
+				found := false
+
+				for j := 0; j < elemType.NumField(); j++ {
+					field := elemType.Field(j)
+					if strings.EqualFold(parts[i], field.Name) {
+						keyEndIdx = i
+						found = true
+						break
+					}
+				}
+
+				if found {
+					break
+				}
+			}
+		}
+
+		keyParts := parts[idx+1 : keyEndIdx]
+		keyName := strings.ToLower(strings.Join(keyParts, "_"))
+
+		rest := ParsePath(parts, keyEndIdx, elemType)
+		return append([]string{mapName, keyName}, rest...)
+	}
+
+	if t.Kind() == reflect.Struct {
+		for i := 0; i < t.NumField(); i++ {
+			field := t.Field(i)
+			if strings.EqualFold(parts[idx], field.Name) {
+				rest := ParsePath(parts, idx+1, field.Type)
+				return append([]string{strings.ToLower(field.Name)}, rest...)
+			}
+		}
+	}
+
+	return []string{}
+}
+
 func normalizeKeys[T any](input map[string]string, root string, sep string) map[string]string {
 	knownKeys := getKnownKeys[T]()
 	normalized := make(map[string]string)
@@ -74,3 +128,44 @@ func getKnownKeys[T any]() []string {
 
 	return keys
 }
+
+func normalizeACLKeys[T any](input map[string]string, root string, sep string) map[string]string {
+	normalized := make(map[string]string)
+	var t T
+	rootType := reflect.TypeOf(t)
+
+	for k, v := range input {
+		parts := strings.Split(strings.ToLower(k), sep)
+
+		if len(parts) < 2 {
+			continue
+		}
+
+		if parts[0] != "tinyauth" {
+			continue
+		}
+
+		if parts[1] != root {
+			continue
+		}
+
+		if len(parts) > 2 {
+			parsedParts := ParsePath(parts[2:], 0, rootType)
+
+			if len(parsedParts) == 0 {
+				continue
+			}
+
+			final := "tinyauth"
+			final += "." + root
+
+			for _, part := range parsedParts {
+				final += "." + strcase.LowerCamelCase(part)
+			}
+
+			normalized[final] = v
+		}
+	}
+
+	return normalized
+}

internal/utils/decoders/env_decoder.go

@@ -17,3 +17,17 @@ func DecodeEnv[T any, C any](env map[string]string, subName string) (T, error) {
 
 	return result, nil
 }
+
+func DecodeACLEnv[T any](env map[string]string, subName string) (T, error) {
+	var result T
+
+	normalized := normalizeACLKeys[T](env, subName, "_")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
+
+	if err != nil {
+		return result, err
+	}
+
+	return result, nil
+}

internal/utils/decoders/flags_decoder.go

@@ -21,6 +21,21 @@ func DecodeFlags[T any, C any](flags map[string]string, subName string) (T, erro
 	return result, nil
 }
 
+func DecodeACLFlags[T any](flags map[string]string, subName string) (T, error) {
+	var result T
+
+	filtered := filterFlags(flags)
+	normalized := normalizeACLKeys[T](filtered, subName, "-")
+
+	err := parser.Decode(normalized, &result, "tinyauth", "tinyauth."+subName)
+
+	if err != nil {
+		return result, err
+	}
+
+	return result, nil
+}
+
 func filterFlags(flags map[string]string) map[string]string {
 	filtered := make(map[string]string)
 	for k, v := range flags {