feat: implement image caching mechanism with configurable cache duration and flush functionality

src/lib/services/series.service.ts

@@ -1,10 +1,11 @@
 import { BaseApiService } from "./base-api.service";
 import type { LibraryResponse } from "@/types/library";
-import type { KomgaBook, KomgaSeries } from "@/types/komga";
+import type { KomgaBook, KomgaSeries, TTLConfig } from "@/types/komga";
 import { BookService } from "./book.service";
 import type { ImageResponse } from "./image.service";
 import { ImageService } from "./image.service";
 import { PreferencesService } from "./preferences.service";
+import { ConfigDBService } from "./config-db.service";
 import { getServerCacheService } from "./server-cache.service";
 import { ERROR_CODES } from "../../constants/errorCodes";
 import { AppError } from "../../utils/errors";
@@ -12,6 +13,16 @@ import type { UserPreferences } from "@/types/preferences";
 import type { ServerCacheService } from "./server-cache.service";
 
 export class SeriesService extends BaseApiService {
+  private static async getImageCacheMaxAge(): Promise<number> {
+    try {
+      const ttlConfig: TTLConfig | null = await ConfigDBService.getTTLConfig();
+      const maxAge = ttlConfig?.imageCacheMaxAge ?? 2592000;
+      return maxAge;
+    } catch (error) {
+      console.error('[ImageCache] Error fetching TTL config:', error);
+      return 2592000; // 30 jours par défaut en cas d'erreur
+    }
+  }
   static async getSeries(seriesId: string): Promise<KomgaSeries> {
     try {
       return this.fetchWithCache<KomgaSeries>(
@@ -179,6 +190,7 @@ export class SeriesService extends BaseApiService {
     try {
       // Récupérer les préférences de l'utilisateur
       const preferences: UserPreferences = await PreferencesService.getPreferences();
+      const maxAge = await this.getImageCacheMaxAge();
 
       // Si l'utilisateur préfère les vignettes, utiliser la miniature
       if (preferences.showThumbnails) {
@@ -186,7 +198,7 @@ export class SeriesService extends BaseApiService {
         return new Response(response.buffer.buffer as ArrayBuffer, {
           headers: {
             "Content-Type": response.contentType || "image/jpeg",
-            "Cache-Control": "public, max-age=31536000, immutable",
+            "Cache-Control": `public, max-age=${maxAge}, immutable`,
           },
         });
       }