move shared package to cli

packages/cli/src/actions/download.ts

@@ -0,0 +1,90 @@
+import inquirer from 'inquirer'
+import { access, constants, writeFile } from 'node:fs/promises'
+import { basename, resolve } from 'node:path'
+import { AES, Hex } from 'occulto'
+import pretty from 'pretty-bytes'
+import { Adapters } from '../shared/adapters.js'
+import { API } from '../shared/api.js'
+
+export async function download(url: URL, all: boolean, suggestedPassword?: string) {
+  API.setOptions({ server: url.origin })
+  const id = url.pathname.split('/')[2]
+  const preview = await API.info(id).catch(() => {
+    throw new Error('Note does not exist or is expired')
+  })
+
+  // Password
+  let password: string
+  const derivation = preview?.meta.derivation
+  if (derivation) {
+    if (suggestedPassword) {
+      password = suggestedPassword
+    } else {
+      const response = await inquirer.prompt([
+        {
+          type: 'password',
+          message: 'Note password',
+          name: 'password',
+        },
+      ])
+      password = response.password
+    }
+  } else {
+    password = url.hash.slice(1)
+  }
+
+  const key = derivation ? (await AES.derive(password, derivation))[0] : Hex.decode(password)
+  const note = await API.get(id)
+
+  const couldNotDecrypt = new Error('Could not decrypt note. Probably an invalid password')
+  switch (note.meta.type) {
+    case 'file':
+      const files = await Adapters.Files.decrypt(note.contents, key).catch(() => {
+        throw couldNotDecrypt
+      })
+      if (!files) {
+        throw new Error('No files found in note')
+      }
+
+      let selected: typeof files
+      if (all) {
+        selected = files
+      } else {
+        const { names } = await inquirer.prompt([
+          {
+            type: 'checkbox',
+            message: 'What files should be saved?',
+            name: 'names',
+            choices: files.map((file) => ({
+              value: file.name,
+              name: `${file.name} - ${file.type} - ${pretty(file.size, { binary: true })}`,
+              checked: true,
+            })),
+          },
+        ])
+        selected = files.filter((file) => names.includes(file.name))
+      }
+
+      if (!selected.length) throw new Error('No files selected')
+      await Promise.all(
+        selected.map(async (file) => {
+          let filename = resolve(file.name)
+          try {
+            // If exists -> prepend timestamp to not overwrite the current file
+            await access(filename, constants.R_OK)
+            filename = resolve(`${Date.now()}-${file.name}`)
+          } catch {}
+          await writeFile(filename, file.contents)
+          console.log(`Saved: ${basename(filename)}`)
+        })
+      )
+
+      break
+    case 'text':
+      const plaintext = await Adapters.Text.decrypt(note.contents, key).catch(() => {
+        throw couldNotDecrypt
+      })
+      console.log(plaintext)
+      break
+  }
+}