move shared package to cli

packages/cli/src/shared/adapters.ts

@@ -0,0 +1,61 @@
+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(),
+}