init

backend/lib/anki.js

@@ -0,0 +1,89 @@
+import { readFile } from 'fs/promises'
+import { open } from 'sqlite'
+import sqlite3 from 'sqlite3'
+import AdmZip from 'adm-zip'
+
+// database structure: https://github.com/ankidroid/Anki-Android/wiki/Database-Structure
+// python example: https://github.com/patarapolw/ankisync2
+// old js example: https://github.com/nornagon/mkanki/blob/master/index.js
+
+// to create a zip file
+// const zip = new AdmZip()
+// zip.addLocalFolder('./folder_to_zip')
+// zip.writeZip('./output.zip')
+
+class Deck {
+
+  /**
+   * 
+   * @param info ID of internal deck, or filename or anki export
+   * @param process whether or not this is an external anki export to process
+   */
+  constructor(info, process) {
+    // pull out variables
+    this.notes = null // this is what is edited; may create multiple cards
+    this.media = null // image and audio files attached to cards/notes
+  }
+
+  /**
+   * Loads an internal deck
+   */
+  async load(id) {
+    // open database
+    // open media files
+  }
+
+  /**
+   * Processes an anki export for internal use. Currently only supports
+   * .apkg files. In the future, may support:
+   *   colpkg
+   *   txt (notes)
+   *   txt (cards)
+   * 
+   * @param filename path of file to process
+   */
+  async process(filename) {
+    return await this.processApkg(filename)
+  }
+
+  /**
+   * Processes a .apkg file into a database
+   * 
+   * @param filename name of file to open and process
+  */
+  async processApkg(filename) {
+    // error handling
+    if (!filename) throw new Error('Must specify a .apkg filename')
+
+    // setup
+    let uuid = crypto.randomUUID()
+    let location = `../data/anki/decks/${uuid}/`
+
+    // make the resource folder if it does not exist already
+    // let resource = ''
+    // if (!fs.existsSync(resource)) fs.mkdirSync(resource, { recursive: true })
+
+    // extract zip
+    // https://stuk.github.io/jszip/documentation/howto/read_zip.html#in-nodejs
+    let zip = new AdmZip(filename)
+    zip.extractAllTo(location, true)
+
+    // extract the notes database
+    let db = await open({
+      filename: location + 'collection.anki2',
+      driver: sqlite3.cached.Database
+    })
+
+    let result = await db.get('SELECT sfld FROM notes WHERE id = :n', 1486785585103)
+
+    console.log(result);
+
+    // extract media files
+    // ? process/rename media files and update in db?
+    // load data into this obj
+
+    // return { notes, media }
+  }
+}
+
+export default Deck