pouchdb-adapter-asyncstorage/src/inline_attachments.js

asyncstorage adapter for PouchDB

'use strict'

import { base64StringToBlobOrBuffer } from 'pouchdb-binary-utils'
import { forAttachment } from './keys'

export default function (db, dataDocs, {binaryAttachments}, callback) {
  const attachmentKeys = dataDocs.reduce((res, data) => {
    data && data._attachments && Object.keys(data._attachments).forEach(key => {
      res.push(forAttachment(data._attachments[key].digest))
    })
    return res
  }, [])

  db.storage.multiGet(attachmentKeys, (error, attachments) => {
    if (error) return callback(error)

    const attachmentObj = attachments.reduce(
      (res, attachment) => {
        if (attachment) res[attachment.digest] = attachment
        return res
      }, {})

    dataDocs.forEach(doc => {
      doc && doc._attachments && Object.keys(doc._attachments).forEach(key => {
        const newAttachment = {...attachmentObj[doc._attachments[key].digest]}
        if (newAttachment) {
          doc._attachments[key] = newAttachment
          if (binaryAttachments) {
            const contentType = doc._attachments[key].content_type
            doc._attachments[key].data = base64StringToBlobOrBuffer(
              doc._attachments[key].data,
              contentType
            )
          }
        }
      })
    })

    callback()
  })
}