Attachment_fu rotate image in S3 storage Rails - ruby-on-rails

Question

How to rotate image in S3 storage, I'm using Attachment_fu and Amazon S3 , I want to implement a feature that lets users edit existing images by rotating it 90 degrees. I was wondering if anyone had played with this, or had any ideas. I'm currently using rmagick
to rotate the image in Rails directory. But in AWS S3 storage cannot rotate the image.
require 'RMagick'
def rotate
photo = Photo.find(params[:id])
image = Magick::ImageList.new(photo.file)
image = image.rotate(90)
image.write(photo.file)
end
I'm using this gem:
gem 'pothoven-attachment_fu'
gem 'aws-s3'
gem 'rmagick'

Answer 1

I solved this problem.
def update_photo
require 'RMagick'
require 'base64'
# get the image data in Photo table
#photo = Photo.where(id: params[:photo_id]).first
# get image path in S3 url and encode to Base64 binary
img_url = #photo.s3_url()
img_uri = URI.parse(img_url)
base64_image = Base64.encode64(open(img_uri) { |io| io.read })
image_file_name = File.basename(img_uri.path,File.extname(img_uri.path))
filename_path = "#{Rails.root.to_s}/tmp/#{image_file_name}"
# create tempfile in rails root/tmp folder and decode the Base64 binary into image file, then processing RMagick to rotate the image into desire image rotation.
#tempfile = Tempfile.new(filename_path)
#tempfile.binmode
#tempfile.write Base64.decode64(base64_image)
#tempfile.close
# rotate image using RMagick
Magick::Image.read(img_uri).first.rotate!(params[:photo_degree].to_i).write(#tempfile.path)
# for security we want the actual content type, not just what was passed in
# get mime type of image and passed into ActionDispatch type
content_type = `file --mime -b #{#tempfile.path}`.split(";")[0]
# we will also add the extension ourselves based on the above
# if it's not gif/jpeg/png, it will fail the validation in the upload model
extension = content_type.match(/gif|jpeg|png/).to_s
extension = "jpg" if extension == "jpeg"
# append filename to prevent browser image caching
filename_path += "_#{params[:photo_degree]}"
filename_path += ".#{extension}" if extension
# passed the data into Rails core ActionDispatch instead of file input object
file = ActionDispatch::Http::UploadedFile.new({
tempfile: #tempfile,
type: content_type,
filename: filename_path
})
# delete the existing image
#photo.destroy
# create new image
img_rotate = Photo.new()
img_rotate.id = #photo.id
img_rotate.uploaded_data = file
img_rotate.save
ensure
clean_tempfile
end
def clean_tempfile
if #tempfile
#tempfile.close
#tempfile.unlink
end
end