Use paperclip for saving base64 images obtained from an api - ruby-on-rails

Question

I have a Photo model with an image attribute. The image contains a base64 string obtained from an api. I need to run an after_create callback and I was thinking I could use Paperclip for saving the image to the disk in the callback as it would save me some work implementing the folder structure in the public folder and generating thumbnails. Is there an easy way to do that?

Answer 1

To answer my own question, here is what I've come up with:
class Photo < ActiveRecord::Base
before_validation :set_image
has_attached_file :image, styles: { thumb: "x100>" }
validates_attachment :image, presence: true, content_type: { content_type: ["image/jpeg", "image/jpg"] }, size: { in: 0..10.megabytes }
def set_image
StringIO.open(Base64.decode64(image_json)) do |data|
data.class.class_eval { attr_accessor :original_filename, :content_type }
data.original_filename = "file.jpg"
data.content_type = "image/jpeg"
self.image = data
end
end
end
image_json is a text field containing the actual base64 encoded image (just the data part, eg "/9j/4AAQSkZJRg...")

Answer 2

your set_image should look something like this
def set_image
self.update({image_attr: "data:image/jpeg;base64," + image_json[PATH_TO_BASE64_DATA]})
end

Answer 3

At least with Paperclip 5 it works out of the box you need to provide base64 string with format data:image/jpeg;base64,#{base64_encoded_file}
For you model it will be
Photo.new(
image: "data:image/jpeg;base64,#{image_json}",
image_file_name: 'file.jpg' # this way you can provide file_name
)
Additionally in your controller you do not need to change anything:-) (maybe you would like to accept :image_file_name in params)

Answer 4

As of Paperclip 5.2 you need to register the DataUriAdapter for Paperclip to handle base64 images for you.
In config/initializers/paperclip put:
Paperclip::DataUriAdapter.register
Then as #eldi says you can just do:
Photo.new(
image: "data:image/jpeg;base64,#{image_json}",
image_file_name: 'file.jpg' # this way you can provide file_name
)
(See Paperclip release notes here)

Answer 5

require 'RMagick'
data = params[:image_text]# code like this data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABPUAAAI9CAYAAABSTE0XAAAgAElEQVR4Xuy9SXPjytKm6ZwnUbNyHs7Jc7/VV9bW1WXWi9q
image_data = Base64.decode64(data['data:image/png;base64,'.length .. -1])
new_file=File.new("somefilename.png", 'wb')
new_file.write(image_data)
After you kan use image as file
Photo.new(image: image)#save useng paperclip in Photo model