How can I get file extension from URI for an rails application

Question

I want to find File extensions like .gif,.jpg,.txt from the uri like http://testasp.vulnweb.com/avatars/noavatar.gif.

score 25 · Answer 1 · answered Jan 06 '12 at 11:16

25

You can use an extname method of File

url = "http://testasp.vulnweb.com/avatars/noavatar.gif"
File.extname(url) #=> .gif

answered Jan 06 '12 at 11:16

alony

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You're assuming that the URL looks like a file path but that's not necessarily a valid assumption. What happens if there's a fragment or CGI parameters? – mu is too short Nov 18 '16 at 19:56

score 5 · Answer 2 · answered Jan 06 '12 at 11:13

5

There may be an easier way to do this but I'd recommend using a combination of the Pathname and URI libraries

require 'uri'

uri = URI("http://testasp.vulnweb.com/avatars/noavatar.gif")

path = uri.path # /avatars/noavatar.gif

pathname = Pathname.new(path)

extension = pathname.extname # gif

See the Pathname and URI library docs for more info.

answered Jan 06 '12 at 11:13

Chris Bailey

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Thanx for your replay...my another question is how can i traverse through the source folder of a uri and get extensions?... – Nidhi Barot Jan 06 '12 at 11:56

score 2 · Answer 3 · answered Nov 18 '16 at 19:27

If you are in Rails and you are talking about the request URL path's extension you can do this from a controller or helper:

File.extname(request.path)

Noting that request.path is a method of the request object in the rails controller.

And noting that request.path will never return nil.

score 0 · Answer 4 · edited May 23 '17 at 11:54

0

I know that you asked about extracting file extension, though take a look at this question/answers Determine file type in Ruby it's better and more secure to rely on mime type rather than extension.

edited May 23 '17 at 11:54

Community

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answered Jan 06 '12 at 22:33

shurikk

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How can I get file extension from URI for an rails application

4 Answers4