cryptgeon/packages/shared/src/adapters.ts
2023-04-27 19:01:26 +02:00

62 lines
1.9 KiB
TypeScript

import { AES, Bytes, type TypedArray } from 'occulto'
import type { EncryptedFileDTO, FileDTO } from './api'
abstract class CryptAdapter<T> {
abstract encrypt(plaintext: T, key: TypedArray): Promise<string>
abstract decrypt(ciphertext: string, key: TypedArray): Promise<T>
}
class CryptTextAdapter implements CryptAdapter<string> {
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<TypedArray> {
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<FileDTO[]> {
async encrypt(plaintext: FileDTO[], key: TypedArray) {
const adapter = new CryptBlobAdapter()
const data: Promise<EncryptedFileDTO>[] = 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(),
}