import { AES, Bytes, type TypedArray } from 'occulto' import type { EncryptedFileDTO, FileDTO } from './api' abstract class CryptAdapter { abstract encrypt(plaintext: T, key: TypedArray): Promise abstract decrypt(ciphertext: string, key: TypedArray): Promise } class CryptTextAdapter implements CryptAdapter { async encrypt(plaintext: string, key: TypedArray) { return await AES.encrypt(Bytes.encode(plaintext), key) } async decrypt(ciphertext: string, key: TypedArray) { return Bytes.decode(await AES.decrypt(ciphertext, key)) } } class CryptBlobAdapter implements CryptAdapter { async encrypt(plaintext: TypedArray, key: TypedArray) { return await AES.encrypt(plaintext, key) } async decrypt(ciphertext: string, key: TypedArray) { return await AES.decrypt(ciphertext, key) // const plaintext = await AES.decrypt(ciphertext, key) // return new Blob([plaintext], { type: 'application/octet-stream' }) } } class CryptFilesAdapter implements CryptAdapter { async encrypt(plaintext: FileDTO[], key: TypedArray) { const adapter = new CryptBlobAdapter() const data: Promise[] = plaintext.map(async (file) => ({ name: file.name, size: file.size, type: file.type, contents: await adapter.encrypt(file.contents, key), })) return JSON.stringify(await Promise.all(data)) } async decrypt(ciphertext: string, key: TypedArray) { const adapter = new CryptBlobAdapter() const data: EncryptedFileDTO[] = JSON.parse(ciphertext) const files: FileDTO[] = await Promise.all( data.map(async (file) => ({ name: file.name, size: file.size, type: file.type, contents: await adapter.decrypt(file.contents, key), })) ) return files } } export const Adapters = { Text: new CryptTextAdapter(), Blob: new CryptBlobAdapter(), Files: new CryptFilesAdapter(), }