#RUBY DOWNLOAD FILE FROM URL HOW TO#
#RUBY DOWNLOAD FILE FROM URL INSTALL#
#RUBY DOWNLOAD FILE FROM URL CODE#
#RUBY DOWNLOAD FILE FROM URL DOWNLOAD#

Have you used alternative methods for downloading images in Ruby? Let me know how in the comments below or on Twitter at published at.

#RUBY DOWNLOAD FILE FROM URL DOWNLOAD#

You could use this to download media from Twilio MMS or WhatsApp messages or hook this up with Active Storage in Rails to make more options for users uploading images.

#RUBY DOWNLOAD FILE FROM URL CODE#

Down is much safer as it saves us from infinite redirect loops and remote code injection, and it is more user friendly as it always returns a Tempfile and lets us easily restrict fileВ size.

#RUBY DOWNLOAD FILE FROM URL HOW TO#

In this post weвЂ™ve seen how to download images using both open-uri and Down. There are more options in the documentation, including how to stream files down and change the back-end of the gem from open-uri and Net::HTTP to HTTP.rb or Wget.

If you wanted to download a file that was at most 5MB in size with at most 5 redirects, you wouldВ use: Down.download( This stops attacker tying up your server with giant image downloads. You can also limit the size of the file with the max_size options. By default it only allows 2 redirects, but you can control that with the max_redirects options. Advanced usageДown takes a bunch of other options too, to control the download experience. Now weвЂ™ve downloaded the file safely and efficiently and stored it permanently on our hardВ drive. require 'down'ДЇileUtils.mv(tempfile.path, './#') To get the original name of the file, the Tempfile object that Down returns has an original_filename method we canВ use. In this case we can download the file to a Tempfile and then move it to a permanent location on ourВ drive.ДЇor this weвЂ™ll use FileUtils#mv which takes two arguments, the file name and the destination we want to move it to.

If you want to keep the name of the file from the URL you need to do a bit more work. This will give the downloaded file a random name generated by Tempfile. Passing a directory as aВ :destination option will save the file to that directory. If you want to save this file to the file system, Down has an option for that. We can download the image to a Tempfile using Down.download: require 'down'

#RUBY DOWNLOAD FILE FROM URL INSTALL#

Start by installing theВ gem: gem install down LetвЂ™s download the same image using Down. It allows you to avoid these issues to safely and efficiently downloadВ files. To solve all of this, Janko created the Down gem. Janko MarohniД‡ discovered a bunch of these issues while working on Shrine. It also turns out that open-uri has some other quirks. First up, the above code is not very memory efficient, it loads the entire image into memory and then writes to disk. The thing is, using open-uri like this is not ideal. Plus, thereвЂ™s a bunch of other potential issues with using open-uri. In practice you would want to handle potential errors, such as a 404 error for a missing image. This is a success, but this was a straightforward example. In the directory in which you opened IRB you will now find the image you downloaded. Open up IRB and try the following: require 'open-uri' We can then open up a file and write the contents of the image to the file.

To do so, we first require open-uri then use the open method to access an image URL. We can use this to download an image and then save it as aВ file. Open-uri extends Kernel#open so that it can open URIs as if they were files. For example, you can open a file and read its contents with the following code: open('./test.txt') do |file| Kernel#open is a method that you can use to open files, streams, or processes to read to or write from. The most popular way to download a file without any dependencies is to use the standard library open-uri. Have you ever needed to download and save an image in your Ruby application? Read on to find outВ how.

Ruby download file from url