feat: add ability to override the UI configuration with environment variables

backend/internal/common/env_config.go

@@ -25,6 +25,7 @@ type EnvConfigSchema struct {
 	Host                     string     `env:"HOST"`
 	MaxMindLicenseKey        string     `env:"MAXMIND_LICENSE_KEY"`
 	GeoLiteDBPath            string     `env:"GEOLITE_DB_PATH"`
+	UiConfigDisabled         bool       `env:"PUBLIC_UI_CONFIG_DISABLED"`
 }
 
 var EnvConfig = &EnvConfigSchema{
@@ -38,6 +39,7 @@ var EnvConfig = &EnvConfigSchema{
 	Host:                     "0.0.0.0",
 	MaxMindLicenseKey:        "",
 	GeoLiteDBPath:            "data/GeoLite2-City.mmdb",
+	UiConfigDisabled:         false,
 }
 
 func init() {

backend/internal/common/errors.go

@@ -184,3 +184,10 @@ func (e *OidcAccessDeniedError) Error() string {
 }
 
 func (e *OidcAccessDeniedError) HttpStatusCode() int { return http.StatusForbidden }
+
+type UiConfigDisabledError struct{}
+
+func (e *UiConfigDisabledError) Error() string {
+	return "The configuration can't be changed since the UI configuration is disabled"
+}
+func (e *UiConfigDisabledError) HttpStatusCode() int { return http.StatusForbidden }

backend/internal/service/app_config_service.go

@@ -188,12 +188,15 @@ var defaultDbConfig = model.AppConfig{
 }
 
 func (s *AppConfigService) UpdateAppConfig(input dto.AppConfigUpdateDto) ([]model.AppConfigVariable, error) {
-	var savedConfigVariables []model.AppConfigVariable
+	if common.EnvConfig.UiConfigDisabled {
+		return nil, &common.UiConfigDisabledError{}
+	}
 
 	tx := s.db.Begin()
 	rt := reflect.ValueOf(input).Type()
 	rv := reflect.ValueOf(input)
 
+	var savedConfigVariables []model.AppConfigVariable
 	for i := 0; i < rt.NumField(); i++ {
 		field := rt.Field(i)
 		key := field.Tag.Get("json")
@@ -254,9 +257,13 @@ func (s *AppConfigService) ListAppConfig(showAll bool) ([]model.AppConfigVariabl
 		return nil, err
 	}
 
-	// Set the value to the default value if it is empty
 	for i := range configuration {
-		if configuration[i].Value == "" && configuration[i].DefaultValue != "" {
+		if common.EnvConfig.UiConfigDisabled {
+			// Set the value to the environment variable if the UI config is disabled
+			configuration[i].Value = s.getConfigVariableFromEnvironmentVariable(configuration[i].Key, configuration[i].DefaultValue)
+
+		} else if configuration[i].Value == "" && configuration[i].DefaultValue != "" {
+			// Set the value to the default value if it is empty
 			configuration[i].Value = configuration[i].DefaultValue
 		}
 	}
@@ -355,12 +362,25 @@ func (s *AppConfigService) LoadDbConfigFromDb() error {
 			return err
 		}
 
-		if storedConfigVar.Value == "" && storedConfigVar.DefaultValue != "" {
+		if common.EnvConfig.UiConfigDisabled {
+			storedConfigVar.Value = s.getConfigVariableFromEnvironmentVariable(currentConfigVar.Key, storedConfigVar.DefaultValue)
+		} else if storedConfigVar.Value == "" && storedConfigVar.DefaultValue != "" {
 			storedConfigVar.Value = storedConfigVar.DefaultValue
 		}
 
 		dbConfigField.Set(reflect.ValueOf(storedConfigVar))
+
 	}
 
 	return nil
 }
+
+func (s *AppConfigService) getConfigVariableFromEnvironmentVariable(key, fallbackValue string) string {
+	environmentVariableName := utils.CamelCaseToScreamingSnakeCase(key)
+
+	if value, exists := os.LookupEnv(environmentVariableName); exists {
+		return value
+	}
+
+	return fallbackValue
+}

backend/internal/utils/string_util.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"math/big"
 	"net/url"
+	"regexp"
+	"strings"
 	"unicode"
 )
 
@@ -62,3 +64,12 @@ func CamelCaseToSnakeCase(s string) string {
 	}
 	return string(result)
 }
+
+func CamelCaseToScreamingSnakeCase(s string) string {
+	// Insert underscores before uppercase letters (except the first one)
+	re := regexp.MustCompile(`([a-z0-9])([A-Z])`)
+	snake := re.ReplaceAllString(s, `${1}_${2}`)
+
+	// Convert to uppercase
+	return strings.ToUpper(snake)
+}

frontend/src/routes/settings/admin/application-configuration/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { env } from '$env/dynamic/public';
 	import CollapsibleCard from '$lib/components/collapsible-card.svelte';
 	import AppConfigService from '$lib/services/app-config-service';
 	import appConfigStore from '$lib/stores/application-configuration-store';
@@ -13,6 +14,7 @@
 	let { data } = $props();
 	let appConfig = $state(data.appConfig);
 
+	const uiConfigDisabled = env.PUBLIC_UI_CONFIG_DISABLED === 'true';
 	const appConfigService = new AppConfigService();
 
 	async function updateAppConfig(updatedAppConfig: Partial<AllAppConfig>) {
@@ -55,6 +57,7 @@
 	<title>Application Configuration</title>
 </svelte:head>
 
+<fieldset class="flex flex-col gap-5" disabled={uiConfigDisabled}>
 	<CollapsibleCard id="application-configuration-general" title="General" defaultExpanded>
 		<AppConfigGeneralForm {appConfig} callback={updateAppConfig} />
 	</CollapsibleCard>
@@ -75,6 +78,7 @@
 	>
 		<AppConfigLdapForm {appConfig} callback={updateAppConfig} />
 	</CollapsibleCard>
+</fieldset>
 
 <CollapsibleCard id="application-configuration-images" title="Images">
 	<UpdateApplicationImages callback={updateImages} />