Xiaohan-Tian
86 lines
3.3 KiB
TypeScript
86 lines
3.3 KiB
TypeScript
import { OPFS_CONSTANTS } from '../../constants/coreConstants';
|
|
|
|
/**
|
|
* KGAudioFileStorage — Utility for storing and loading audio files
|
|
* in the OPFS media/ directory alongside project data.
|
|
*/
|
|
export class KGAudioFileStorage {
|
|
/**
|
|
* Store an audio file in the project's media/ directory.
|
|
* Creates the project and media directories if they don't exist yet.
|
|
*/
|
|
public static async storeAudioFile(
|
|
projectName: string,
|
|
fileId: string,
|
|
file: File
|
|
): Promise<void> {
|
|
const mediaDir = await KGAudioFileStorage.getOrCreateMediaDir(projectName);
|
|
const fileHandle = await mediaDir.getFileHandle(fileId, { create: true });
|
|
const writable = await fileHandle.createWritable();
|
|
await writable.write(await file.arrayBuffer());
|
|
await writable.close();
|
|
console.log(`Stored audio file ${fileId} (${file.size} bytes) for project "${projectName}"`);
|
|
}
|
|
|
|
/**
|
|
* Load an audio file as ArrayBuffer from the project's media/ directory.
|
|
*/
|
|
public static async loadAudioFile(
|
|
projectName: string,
|
|
fileId: string
|
|
): Promise<ArrayBuffer> {
|
|
const mediaDir = await KGAudioFileStorage.getMediaDir(projectName);
|
|
const fileHandle = await mediaDir.getFileHandle(fileId);
|
|
const file = await fileHandle.getFile();
|
|
return file.arrayBuffer();
|
|
}
|
|
|
|
/**
|
|
* Delete an audio file from the project's media/ directory.
|
|
*/
|
|
public static async deleteAudioFile(
|
|
projectName: string,
|
|
fileId: string
|
|
): Promise<void> {
|
|
try {
|
|
const mediaDir = await KGAudioFileStorage.getMediaDir(projectName);
|
|
await mediaDir.removeEntry(fileId);
|
|
console.log(`Deleted audio file ${fileId} from project "${projectName}"`);
|
|
} catch (error) {
|
|
console.warn(`Failed to delete audio file ${fileId}:`, error);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generate a unique audio file ID preserving the original file extension.
|
|
*/
|
|
public static generateAudioFileId(originalFileName: string): string {
|
|
const ext = originalFileName.split('.').pop()?.toLowerCase() || 'wav';
|
|
const timestamp = Date.now();
|
|
const random = Math.random().toString(36).substring(2, 10);
|
|
return `audio_${timestamp}_${random}.${ext}`;
|
|
}
|
|
|
|
/**
|
|
* Get the media directory handle for an existing project (read/delete path).
|
|
* Does NOT create directories — fails if project folder doesn't exist.
|
|
*/
|
|
private static async getMediaDir(projectName: string): Promise<FileSystemDirectoryHandle> {
|
|
const root = await navigator.storage.getDirectory();
|
|
const projectsDir = await root.getDirectoryHandle(OPFS_CONSTANTS.ROOT_DIR);
|
|
const projectDir = await projectsDir.getDirectoryHandle(projectName);
|
|
return projectDir.getDirectoryHandle(OPFS_CONSTANTS.MEDIA_DIR, { create: true });
|
|
}
|
|
|
|
/**
|
|
* Get or create the media directory handle for a project (write path).
|
|
* Creates project and media directories if they don't exist.
|
|
*/
|
|
private static async getOrCreateMediaDir(projectName: string): Promise<FileSystemDirectoryHandle> {
|
|
const root = await navigator.storage.getDirectory();
|
|
const projectsDir = await root.getDirectoryHandle(OPFS_CONSTANTS.ROOT_DIR, { create: true });
|
|
const projectDir = await projectsDir.getDirectoryHandle(projectName, { create: true });
|
|
return projectDir.getDirectoryHandle(OPFS_CONSTANTS.MEDIA_DIR, { create: true });
|
|
}
|
|
}
|