# Membrane Multimedia Framework: Hackney Element
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This package provides elements that can be used to read files over HTTP using
[Hackney](https://github.com/benoitc/hackney) library.
It is part of [Membrane Multimedia Framework](https://membraneframework.org).
## Installation
Add the following line to your `deps` in `mix.exs`. Run `mix deps.get`.
```elixir
{:membrane_element_hackney, "~> 0.2"}
```
## Sample usage
### `Membrane.Element.Hackney.Source`
This pipeline should get you a kitten from imgur and save as `kitty.jpg`. To run it you need [`:membrane_element_file`](https://github.com/membraneframework/membrane-element-file) in your project's dependencies.
```elixir
defmodule DownloadPipeline do
use Membrane.Pipeline
alias Pipeline.Spec
alias Membrane.Element.File
alias Membrane.Element.Hackney
@impl true
def handle_init(_) do
children = [
hackney_src: %Hackney.Source{location: "http://i.imgur.com/z4d4kWk.jpg"},
file_sink: %File.Sink{location: "kitty.jpg"},
]
links = %{
{:hackney_src, :source} => {:file_sink, :sink}
}
{{:ok, %Spec{children: children, links: links}}, %{}}
end
end
{:ok, pid} = DownloadPipeline.start(nil)
DownloadPipeline.play(pid)
```
### `Membrane.Element.Hackney.Sink`
The following pipeline is an example of file upload - it requires [Goth](https://github.com/peburrows/goth) library with
properly configurated credentials for Google Cloud and [`:membrane_element_file`](https://github.com/membraneframework/membrane-element-file)
```elixir
defmodule UploadPipeline do
use Membrane.Pipeline
alias Membrane.Pipeline.Spec
alias Membrane.Element.{File, Hackney}
@impl true
def handle_init([bucket, name]) do
children = [
src: %File.Source{location: "sample.flac"},
sink: %Hackney.Sink{
method: :post,
location: build_uri(bucket, name),
headers: [auth_header(), {"content-type", "audio/flac"}]
}
]
links = %{
{:src, :output} => {:sink, :input}
}
{{:ok, %Spec{children: children, links: links}}, %{}}
end
@impl true
def handle_notification(%Hackney.Sink.Response{} = response, element_name, state) do
IO.inspect({element_name, response})
{:ok, state}
end
def handle_notification(_notification, _element_name, state) do
{:ok, state}
end
defp auth_header do
{:ok, token} = Goth.Token.for_scope("https://www.googleapis.com/auth/devstorage.read_write")
{"Authorization", "#{token.type} #{token.token}"}
end
defp build_uri(bucket, name) do
"https://www.googleapis.com/upload/storage/v1/b/#{bucket}/o?" <>
URI.encode_query(uploadType: "media", name: name)
end
end
{:ok, pid} = UploadPipeline.start(["some_bucket", "uploaded_file_name.flac"])
UploadPipeline.play(pid)
```
## Sponsors
The development of this element was sponsored by [Abridge AI, Inc.](https://abridge.com)
## Copyright and License
Copyright 2018, [Software Mansion](https://swmansion.com/?utm_source=git&utm_medium=readme&utm_campaign=membrane)
[![Software Mansion](https://membraneframework.github.io/static/logo/swm_logo_readme.png)](https://swmansion.com/?utm_source=git&utm_medium=readme&utm_campaign=membrane)