feat: Add dynamic S3 Cache-Control headers based on upload folder type to S3 upload operations.

src/upload/upload.service.ts

@@ -56,6 +56,20 @@ export class UploadService {
     return parts.length > 1 ? parts.pop()!.toLowerCase() : '';
   }
 
+  /**
+   * Get Cache-Control header value based on folder type
+   * Since file IDs change on re-upload, we can use long cache times
+   */
+  private getCacheControl(folder: UploadFolder): string {
+    const cacheDurations: Record<UploadFolder, number> = {
+      [UploadFolder.AVATARS]: 30 * 24 * 60 * 60,      // 30 days
+      [UploadFolder.DOCUMENTS]: 7 * 24 * 60 * 60,     // 7 days
+      [UploadFolder.PROPERTIES]: 30 * 24 * 60 * 60,   // 30 days
+      [UploadFolder.VERIFICATION]: 1 * 24 * 60 * 60,  // 1 day
+    };
+    return `public, max-age=${cacheDurations[folder] || 86400}`;
+  }
+
   private validateContentType(contentType: string, folder: UploadFolder): void {
     const allowedTypes: Record<UploadFolder, string[]> = {
       [UploadFolder.AVATARS]: ['image/jpeg', 'image/png', 'image/webp'],
@@ -100,6 +114,7 @@ export class UploadService {
       Bucket: this.bucket,
       Key: key,
       ContentType: dto.contentType,
+      CacheControl: this.getCacheControl(dto.folder),
     });
 
     const uploadUrl = await getSignedUrl(this.s3Client, command, {
@@ -165,6 +180,7 @@ export class UploadService {
       Key: key,
       Body: buffer,
       ContentType: contentType,
+      CacheControl: this.getCacheControl(folder),
     });
 
     await this.s3Client.send(command);
@@ -198,6 +214,7 @@ export class UploadService {
       Bucket: this.bucket,
       Key: key,
       ContentType: contentType,
+      CacheControl: this.getCacheControl(UploadFolder.AVATARS),
     });
 
     const uploadUrl = await getSignedUrl(this.s3Client, command, {
@@ -234,6 +251,7 @@ export class UploadService {
       Bucket: this.bucket,
       Key: key,
       ContentType: contentType,
+      CacheControl: this.getCacheControl(UploadFolder.AVATARS),
     });
 
     const uploadUrl = await getSignedUrl(this.s3Client, command, {