# All files / src/client/files add.js

90.48% Statements 76/84
78.13% Branches 25/32
94.44% Functions 17/18
94.74% Lines 72/76

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     import { caller } from 'postmsg-rpc'
    import callbackify from 'callbackify'
    import { Transform } from 'stream'
    import pull from 'pull-stream'
    import PMS from 'pull-postmsg-stream'
    import toPull from 'stream-to-pull-stream'
    import isStream from 'is-stream'
    import { isSource } from 'is-pull-stream'
    import shortid from 'shortid'
    import { pre } from 'prepost'
    import defer from 'pull-defer'
    import Abortable from 'pull-abortable'
    import { isBuffer, bufferToJson } from '../../serialization/buffer'
    import { functionToJson } from '../../serialization/function'

    export default function (opts) {
      const api = {
        add: callbackify.variadic(
          pre(
            (...args) => {
              const fileToJsonOpts = { pms: opts }

              // FIXME: implement progress properly
              if (args[1] && args[1].progress) {
                fileToJsonOpts.onProgressIncrement = createOnProgressIncrement(args[1].progress)
                delete args[1].progress
              }

              args[0] = Array.isArray(args[0])
                ? args[0].map(file => fileToJson(file, fileToJsonOpts))
                : fileToJson(args[0], fileToJsonOpts)

              return args
            },
            caller('ipfs.files.add', opts)
          )
        ),
        // FIXME: implement add readable stream properly
        addReadableStream (...args) {
          const content = []
          return new Transform({
            objectMode: true,
            transform (file, enc, cb) {
              content.push(file)
              cb()
            },
            flush (cb) {
              api.add.apply(api, [content].concat(args, (err, res) => {
                Iif (err) return cb(err)
                res.forEach((file) => this.push(file))
                cb()
              }))
            }
          })
        },
        addPullStream: (() => {
          const addPullStream = caller('ipfs.files.addPullStream', opts)

          return (...args) => {
            const deferred = defer.source()
            const abortable = Abortable()
            const fileToJsonOpts = { pms: opts }

            // FIXME: implement progress properly
            Iif (args[0] && args[0].progress) {
              fileToJsonOpts.onProgressIncrement = createOnProgressIncrement(args[0].progress)
              delete args[0].progress
            }

            const readFnName = shortid()

            // Create the through stream what will connect the client to the
            // server, our source is deferred, until the server responds to tell
            // us the name of the read function we can use to pull added file
            // info from.
            const through = function (read) {
              PMS.sink(readFnName, opts)(read)
              return deferred
            }

            // Call addPullStream on the server, sending the name of the read
            // function it can use to pull files to add from.
            addPullStream(functionToJson(readFnName), ...args)
              .then((res) => deferred.resolve(PMS.source(res.name, opts)))
              .catch((err) => abortable.abort(err))

            return pull(
              pull.map(file => fileToJson(file, fileToJsonOpts)),
              through,
              abortable
            )
          }
        })()
      }

      return api
    }

    function createOnProgressIncrement (onProgress) {
      let bytes = 0
      return (incrementBytes) => {
        bytes += incrementBytes
        onProgress(bytes)
        return bytes
      }
    }

    function fileToJson (file, opts) {
      opts = opts || {}

      if (isBuffer(file)) { // Buffer
        if (opts.onProgressIncrement) opts.onProgressIncrement(file.length)
        return bufferToJson(file)
      } else if (isStream.readable(file)) { // Node stream
        return pullStreamToJson(toPull.source(file), opts)
      } else Iif (isSource(file)) { // Pull stream
        return pullStreamToJson(file, opts)
      } else if (file && file.content) { // Object { path?, content }
        return Object.assign({}, file, { content: fileToJson(file.content, opts) })
      }

      return file // Object { path } maybe, but could be anything
    }

    const pullStreamToJson = (source, opts) => {
      opts = opts || {}
      const readFnName = shortid()

      pull(
        source,
        PMS.sink(readFnName, Object.assign({}, opts.pms, {
          post (res) {
            if (isBuffer(res.data)) {
              Iif (opts.onProgressIncrement) opts.onProgressIncrement(res.data.length)
              res.data = bufferToJson(res.data)
            }

            return res
          }
        }))
      )

      return functionToJson(readFnName)
    }