keynote-archives

keynote-archives

Utilities to process Keynote presentations (*.key).

Protobuf files were taken from psobot / keynote-parser. Read more about the iWorkArchive format here. Generated by Keynote version 12.2.1 (current as of December 2022).

How to use?

npm install keynote-archives

Then import the package and unzip the inner files, dechunk the single IWA files and split each chunk into objects.

import { unzip, isIwaFile, dechunk, uncompress, splitObjectsAs, KeynoteArchives } from 'keynote-archives';

export async function decode(data: Uint8Array): void {
  for await(const entry of unzip(data)) {
    if(isIwaFile(entry.name)) {
      for await(const snappyChunk of dechunk(entry.data)) {
        const chunk = await uncompress(snappyChunk.data);
        for await(const message of splitObjectsAs(chunk, KeynoteArchives)) {
          ...
        }
      }
    }
  }
}

Documentation

This package provides asynchronous functions to read IWA format. Here is a small overview about the terminology:

Here is what they do in detail:

• unzip: opens an Uint8Array as Zip file and returns multiple file entries, until EOF.
• dechunk: opens an Uint8Array as IWA file and returns multiple Snappy-compressed chunks as Uint8Array, until EOF.
• uncompress: opens an Uint8Array as Snappy chunk and returns uncompressed data as Uint8Array.
• splitObjectsAs: opens an Uint8 array as IWA file chunk and returns multiple Protobuf-decoded IWA (JSON) objects, until EOF or error.
• decode: (everything at once) opens an Uint8 array as Zip file and returns multiple ArchiveEntrys containing either a file or a list of IWA chunks with multiple IWA objects associated with an IWA file.
• analyzeChunkFor: analyzes an Uint8Array IWA chunk for ArchiveInfo segments and returns archive infos and gaps for further analysis.

You will also get access to all archives types:

• AllArchives is a list of all archives.
• for each Protobuf package XXX, you will get:
  • a list of all package-related archives XXX$Archives
  • a namespace XXX with all archives XXX.yyy
• a map for all Keynote archives by type number KeynoteArchives

Workflow for contributors

npm install                      //Initialize NPM package...
npm run clean                    //Clean artifacts from last build
npm run generate-ts-from-proto   //Generate Typescript files from Protobuf files...
npm run generate-index-from-ts   //Create the index...
npm run build                    //Transpile to Javascript...

License

MIT license