update api chapterlesson

Backend/src/config/minio.ts

@@ -109,3 +109,81 @@ export async function getPresignedUrl(
         throw error;
     }
 }
+
+/**
+ * List all objects in a path prefix
+ */
+export async function listObjects(prefix: string): Promise<{ name: string; size: number; lastModified: Date }[]> {
+    return new Promise((resolve, reject) => {
+        const objects: { name: string; size: number; lastModified: Date }[] = [];
+        const stream = minioClient.listObjectsV2(config.s3.bucket, prefix, true);
+
+        stream.on('data', (obj) => {
+            if (obj.name) {
+                objects.push({
+                    name: obj.name,
+                    size: obj.size || 0,
+                    lastModified: obj.lastModified || new Date(),
+                });
+            }
+        });
+
+        stream.on('error', (err) => {
+            logger.error(`Error listing objects: ${err}`);
+            reject(err);
+        });
+
+        stream.on('end', () => {
+            resolve(objects);
+        });
+    });
+}
+
+/**
+ * List folders in a path prefix
+ * Uses listObjectsV2 with recursive=false to get folder prefixes
+ */
+export async function listFolders(prefix: string): Promise<string[]> {
+    return new Promise((resolve, reject) => {
+        const folders = new Set<string>();
+        const stream = minioClient.listObjectsV2(config.s3.bucket, prefix, false);
+
+        stream.on('data', (obj: any) => {
+            if (obj.prefix) {
+                // Direct folder prefix
+                folders.add(obj.prefix);
+            } else if (obj.name) {
+                // Extract folder part from file path
+                const path = obj.name.replace(prefix, '');
+                const folder = path.split('/')[0];
+
+                if (folder && path.includes('/')) {
+                    folders.add(prefix + folder + '/');
+                }
+            }
+        });
+
+        stream.on('error', (err) => {
+            logger.error(`Error listing folders: ${err}`);
+            reject(err);
+        });
+
+        stream.on('end', () => {
+            resolve(Array.from(folders));
+        });
+    });
+}
+
+/**
+ * Get attachments folder path for a lesson
+ */
+export function getAttachmentsFolder(courseId: number, lessonId: number): string {
+    return `courses/${courseId}/lessons/${lessonId}/attachments/`;
+}
+
+/**
+ * Get video folder path for a lesson
+ */
+export function getVideoFolder(courseId: number, lessonId: number): string {
+    return `courses/${courseId}/lessons/${lessonId}/video/`;
+}