feat: added get theme setting resource endpoint for getting uploaded files

Author: duruer

Pano/src/main/kotlin/com/panomc/platform/AppConstants.kt

@@ -35,6 +35,8 @@ object AppConstants {
 
     val UPDATE_ICON_FOLDER = "update-thumbnail" + File.separator
 
+    val THEME_SETTINS_FILE_UPLOAD_FOLDER = "theme-settings"
+
     val DEFAULT_LOCALES = listOf(
         Locale(
             code = "en-US",

Pano/src/main/kotlin/com/panomc/platform/route/api/GetThemeSettingResourceAPI.kt

@@ -0,0 +1,74 @@
+package com.panomc.platform.route.api
+
+import com.panomc.platform.AppConstants
+import com.panomc.platform.annotation.Endpoint
+import com.panomc.platform.config.ConfigManager
+import com.panomc.platform.model.Api
+import com.panomc.platform.model.Path
+import com.panomc.platform.model.Result
+import com.panomc.platform.model.RouteType
+import com.panomc.platform.util.HashUtil.hash
+import com.panomc.platform.util.MimeTypeUtil
+import io.vertx.ext.web.RoutingContext
+import io.vertx.ext.web.validation.ValidationHandler
+import io.vertx.ext.web.validation.builder.Parameters.param
+import io.vertx.ext.web.validation.builder.ValidationHandlerBuilder
+import io.vertx.json.schema.SchemaRepository
+import io.vertx.json.schema.common.dsl.Schemas.stringSchema
+import java.io.File
+
+@Endpoint
+class GetThemeSettingResourceAPI(private val configManager: ConfigManager) : Api() {
+    override val paths = listOf(Path("/api/theme/file/:filename", RouteType.GET))
+
+    companion object {
+        private const val CACHE_TTL_SECONDS = 7 * 24 * 60 * 60 // 1 week
+    }
+
+    override fun getValidationHandler(schemaRepository: SchemaRepository): ValidationHandler =
+        ValidationHandlerBuilder.create(schemaRepository)
+            .pathParameter(param("filename", stringSchema()))
+            .build()
+
+    override suspend fun handle(context: RoutingContext): Result? {
+        val parameters = getParameters(context)
+
+        val filename = parameters.pathParameter("filename").string
+
+        val path = configManager.config
+            .fileUploadsFolder + File.separator + AppConstants.THEME_SETTINS_FILE_UPLOAD_FOLDER + File.separator +
+                filename
+
+        val file = File(path)
+
+        if (!file.exists()) {
+            context.response().setStatusCode(404).end()
+
+            return null
+        }
+
+        val actualHash = File(path).inputStream().hash()
+
+        val etag = "\"$actualHash\"" // strong ETag
+        val ifNoneMatch = context.request().getHeader("If-None-Match")
+        if (ifNoneMatch?.split(',')?.map { it.trim() }?.contains(etag) == true) {
+            context.response()
+                .setStatusCode(304)
+                .putHeader("ETag", etag)
+                .putHeader("Cache-Control", "public, max-age=$CACHE_TTL_SECONDS, immutable")
+                .end()
+            return null
+        }
+
+        val mimeType = MimeTypeUtil.getMimeTypeFromFileName(path)
+
+        val response = context.response()
+        response.putHeader("Content-Type", mimeType)
+        response.putHeader("ETag", etag)
+        response.putHeader("Cache-Control", "public, max-age=$CACHE_TTL_SECONDS, immutable")
+
+        response.sendFile(path)
+
+        return null
+    }
+}

Pano/src/main/kotlin/com/panomc/platform/route/api/panel/theme/PanelUpdateThemeSettingsAPI.kt

@@ -1,5 +1,6 @@
 package com.panomc.platform.route.api.panel.theme
 
+import com.panomc.platform.AppConstants.THEME_SETTINS_FILE_UPLOAD_FOLDER
 import com.panomc.platform.UIManager
 import com.panomc.platform.annotation.Endpoint
 import com.panomc.platform.auth.AuthProvider
@@ -32,8 +33,6 @@ class PanelUpdateThemeSettingsAPI(
 ) : PanelApi() {
     override val paths = listOf(Path("/api/panel/theme/settings", RouteType.PUT))
 
-    private val themeSettingsFileUploadPath = "theme-settings"
-
     companion object {
         const val THEME_SETTINGS = "theme_settings"
     }
@@ -71,7 +70,7 @@ class PanelUpdateThemeSettingsAPI(
         val newSettings = data.getJsonObject("settings")
 
         val folder = configManager.config
-            .fileUploadsFolder + File.separator + themeSettingsFileUploadPath + File.separator
+            .fileUploadsFolder + File.separator + THEME_SETTINS_FILE_UPLOAD_FOLDER + File.separator
         val folderFile = File(folder)
 
         if (!folderFile.exists() || !folderFile.isDirectory) {