nicolafiorillo / cloudex

An elixir library which helps with uploading image files or urls to cloudinary

Cloudex

Cloudex is an Elixir library that can upload image files or urls to Cloudinary. There is also a CLI tool available.

Getting started

defp deps do
  [  {:cloudex, "~> 1.0.0"},  ]
end

If you are using elixir 1.4, you can skip this step. The Cloudex app must be started. This can be done by adding :cloudex to the applications list in your mix.exs file. An example:

  def application do
    [applications: [:logger, :cloudex],
    ]
  end

Settings

Cloudex requires the API credentials of your Cloudinary account. You can define either as ENV settings using the keys : CLOUDEX_API_KEY CLOUDEX_SECRET and CLOUDEX_CLOUD_NAME

or in your config.exs using :

  config :cloudex,
    api_key: "my-api-key",
    secret: "my-secret",
    cloud_name: "my-cloud-name"

Uploading

You can upload image files or urls pointing to an image as follows :

example

For uploading a url :

iex> Cloudex.upload("http://example.org/test.jpg")
{:ok, %Cloudex.UploadedImage{...}}

For uploading a file :

iex> Cloudex.upload("test/assets/test.jpg")
{:ok, %Cloudex.UploadedImage{...}}

You can also upload a list of files, urls, or mix by giving upload a list like :

iex> Cloudex.upload(["/non/existing/file.jpg", "http://example.org/test.jpg"])
[{:error, "File /non/existing/file.jpg does not exist."}, {:ok, %Cloudex.UploadedImage{...}}]

An example of the %Cloudex.UploadedImage{} Struct looks as follows:

%Cloudex.UploadedImage{
    bytes: 22659,
    created_at: "2015-11-27T10:02:23Z",
    etag: "dbb5764565c1b77ff049d20fcfd1d41d",
    format: "jpg",
    height: 167,
    original_filename: "test",
    public_id: "i2nruesgu4om3w9mtk1z",
    resource_type: "image",
    secure_url: "https://d1vibqt9pdnk2f.cloudfront.net/image/upload/v1448618543/i2nruesgu4om3w9mtk1z.jpg",
    signature: "77b447746476c82bb4921fdea62a9227c584974b",
    source: "http://example.org/test.jpg",
    tags: [],
    type: "upload",
    url: "http://images.cloudassets.mobi/image/upload/v1448618543/i2nruesgu4om3w9mtk1z.jpg",
    version: 1448618543,
    width: 250
}

You can tag uploaded images with strings:

# as array
Cloudex.upload("test/assets/test.jpg", %{tags: ["foo", "bar"]})
# as comma-separated string
Cloudex.upload("test/assets/test.jpg", %{tags: "foo,bar"})

# result
{:ok, %Cloudex.UploadedImage{
    bytes: 22659,
    created_at: "2015-11-27T10:02:23Z",
    etag: "dbb5764565c1b77ff049d20fcfd1d41d",
    format: "jpg",
    height: 167,
    original_filename: "test",
    public_id: "i2nruesgu4om3w9mtk1z",
    resource_type: "image",
    secure_url: "https://d1vibqt9pdnk2f.cloudfront.net/image/upload/v1448618543/i2nruesgu4om3w9mtk1z.jpg",
    signature: "77b447746476c82bb4921fdea62a9227c584974b",
    source: "http://example.org/test.jpg",
    tags: ["foo", "bar"],
    type: "upload",
    url: "http://images.cloudassets.mobi/image/upload/v1448618543/i2nruesgu4om3w9mtk1z.jpg",
    version: 1448618543,
    width: 250
}}

List of additional parameters you can use with upload/2: http://cloudinary.com/documentation/image_upload_api_reference#upload

Cloudinary URL generation

This package also provides an helper to generate urls from cloudinary given a public id of the image. As a second argument you can pass in options to transform your image according via cloudinary.

Current supported options are :

  :aspect_ratio
  :border
  :color
  :coulor
  :crop
  :default_image
  :delay
  :density
  :dpr
  :effect
  :fetch_format
  :flags
  :gravity
  :height
  :opacity
  :overlay
  :quality
  :radius
  :transformation
  :underlay
  :width
  :x
  :y
  :zoom

Example

Cloudex.Url.for("a_public_id")
"//res.cloudinary.com/my_cloud_name/image/upload/a_public_id"

Cloudex.Url.for("a_public_id", %{width: 400, height: 300})
"//res.cloudinary.com/my_cloud_name/image/upload/h_300,w_400/a_public_id"

Cloudex.Url.for("a_public_id", %{crop: "fill", fetch_format: 'auto', flags: 'progressive', width: 300, height: 254, quality: "jpegmini", sign_url: true})
"//res.cloudinary.com/my_cloud_name/image/upload/s--jwB_Ds4w--/c_fill,f_auto,fl_progressive,h_254,q_jpegmini,w_300/a_public_id"

You can add multiple effects using Cloudex.Url.for/2, an example would be adding an overlay to your image, using:

Cloudex.Url.for("a_public_id", [
  %{border: "5px_solid_rgb:c22c33", radius: 5, crop: "fill", height: 246, width: 470, quality: 80},
  %{overlay: "my_overlay", crop: "scale", gravity: "south_east", width: 128 ,x: 5, y: 15}
])
"//res.cloudinary.com/my_cloud_name/image/upload/bo_5px_solid_rgb:c22c33,c_fill,h_246,q_80,r_5,w_470/c_scale,g_south_east,l_my_overlay,w_128,x_5,y_15/a_public_id"

Deleting images

You can request deletion from cloudinary using Cloudex.delete/1 function where the first argument should be the public id of the image you want to delete.

example:

iex> Cloudex.delete("public-id-1")
{:ok, %Cloudex.DeletedImage{public_id: "public-id-1"}}

iex> Cloudex.delete(["public-id-1", "public-id-2"])
[
  {:ok, %Cloudex.DeletedImage{public_id: "public-id-1"}},
  {:ok, %Cloudex.DeletedImage{public_id: "public-id-2"}}
]

Phoenix helper

If you are using phoenix, you can create a small helper called for example cl_image_tag Create a file containing the following :

defmodule MyApp.CloudexImageHelper do
  import Phoenix.HTML.Tag

  def cl_image_tag(public_id, options \\ []) do
    transformation_options = %{}
    if Keyword.has_key?(options, :transforms) do
      transformation_options = Map.merge(%{}, options[:transforms])
    end

    image_tag_options = Keyword.delete(options, :transforms)

    defaults = [
      src: Cloudex.Url.for(public_id, transformation_options),
      width: picture.width,
      height: picture.height,
      alt: "image with name #{public_id}"
    ]

    attributes = Keyword.merge(defaults, image_tag_options)

    tag(:img, attributes)
  end
end

Then in your web.ex add the following line in the def view section:

import MyApp.CloudexImageHelper

You should now be able to use the helper in your views as follows :

cl_image_tag(public_id, class: "thumbnail", transforms: %{opacity: "50", quality: "jpegmini", sign_url: true})

Documentation

Documentation can be found at docs/index.html or online

License

The Cloudex Elixir library is released under the DWTFYW license. See the LICENSE file.