base64使用stringIO上传的图片carrierwave gem在rails上传时会损坏

Question

This is what I'm doing:

In controller:-

    dataurl = params[:dataURL]
    io = FilelessIO.new(Base64.decode64(dataurl))
    io.original_filename = "foobar.jpeg"
    io.content_type = "image/jpeg"
    p = SketchilyTest.new
    p.image = io
    p.save    

Model:-

class FilelessIO < StringIO
    attr_accessor :original_filename
    attr_accessor :content_type
end
class SketchilyTest < ActiveRecord::Base
  attr_accessible :desc, :image
  mount_uploader :image, BaseSixtyfourEncodedUploader

end

BaseSixtyfourEncodedUploader is a simple uploader of carrierwave gem

The issue is that I'm not getting any errors and image gets uploaded but its corrupt.

When I'm trying to open it in the browser I'm getting this error:

The image “http://localhost:3000/uploads/sketchily_test/image/41/foobar.jpeg” cannot be displayed because it contains errors.

Also please note that I'm able to regenerate the image from my base64_encoded data from my database. But not able to save it as a jpeg image with carrierwave.

Answer 1

The image representation is:

data:image/jpeg;base64,/9jblablablabla

Use regexp to get the value data:image/jpeg and /9jblablablabla

image/jpeg will be your file type

/9jblablablabla will be the representation of the image.

Decoding wrong source might cause the image file corrupted. Then, you can use FileTemp to create and save the file. Hope its help others too ..

http://www.ruby-doc.org/stdlib-1.9.3/libdoc/tempfile/rdoc/Tempfile.html