Downloading an MP3 from the internet

ruby-talk
1

I am trying to write a simple script that downloads a music file from the
internet.
For example: if i want to download
http://cdn.stereogum.com/mp3/My%20Morning%20Jacket%20-%20Celebration%20(Live).mp3
how exactly would you do it?

I found someone who was able to download a flickr photo using this script:

require 'net/http'

Net::HTTP.start("farm1.static.flickr.com") { |http|
    resp = http.get("/92/218926700_ecedc5fef7_o.jpg")
    open("fun.jpg", "wb") { |file|
    file.write(resp.body)
    }
}
puts 'Downloaded'

With a slight modification shouldn't this work for the music file?
What makes downloading a photo any different than an mp3 file?

require 'net/http'

Net::HTTP.start("cdn.stereogum.com") { |http|
    resp = http.get("/mp3/My Morning Jacket - Celebration (Live).mp3")
    open("Celebration.mp3", "wb") { |file|
    file.write(resp.body)
    }
}
puts "the song has been downloaded"

Why doesn't it work? What needs to be changed?
Any help would be great! Thanks.

2

Probably because you're not encoding the path

···

On Wed, Jan 14, 2009 at 3:15 AM, Nathaniel Escribano <americaskate@gmail.com > wrote:

I am trying to write a simple script that downloads a music file from the
internet.
For example: if i want to download

http://cdn.stereogum.com/mp3/My%20Morning%20Jacket%20-%20Celebration%20(Live).mp3<http://cdn.stereogum.com/mp3/My%20Morning%20Jacket%20-%20Celebration%20(Live).mp3>
how exactly would you do it?

I found someone who was able to download a flickr photo using this script:

require 'net/http'

Net::HTTP.start("farm1.static.flickr.com") { |http|
   resp = http.get("/92/218926700_ecedc5fef7_o.jpg")
   open("fun.jpg", "wb") { |file|
   file.write(resp.body)
   }
}
puts 'Downloaded'

With a slight modification shouldn't this work for the music file?
What makes downloading a photo any different than an mp3 file?

require 'net/http'

Net::HTTP.start("cdn.stereogum.com") { |http|
   resp = http.get("/mp3/My Morning Jacket - Celebration (Live).mp3")
   open("Celebration.mp3", "wb") { |file|
   file.write(resp.body)
   }
}
puts "the song has been downloaded"

Why doesn't it work? What needs to be changed?
Any help would be great! Thanks.

--
Andrew Timberlake
http://ramblingsonrails.com
http://www.linkedin.com/in/andrewtimberlake

"I have never let my schooling interfere with my education" - Mark Twain

3

Nathaniel Escribano wrote:

require 'net/http'

Net::HTTP.start("cdn.stereogum.com") { |http|
    resp = http.get("/mp3/My Morning Jacket - Celebration (Live).mp3")
    open("Celebration.mp3", "wb") { |file|
    file.write(resp.body)
    }
}
puts "the song has been downloaded"

Here is an alternative way of doing it:

  require 'open-uri'
  open("http://cdn.stereogum.com/mp3/My Morning Jacket - Celebration
(Live).mp3") do |src|
    open("Celebration.mp3","wb") do |dst|
      while blk = src.read(65536)
        dst.write(blk)
      end
    end
  end

This gives a clear error:

/usr/lib/ruby/1.8/uri/common.rb:436:in `split': bad URI(is not URI?):
http://cdn.stereogum.com/mp3/My Morning Jacket - Celebration (Live).mp3
(URI::InvalidURIError)

Fix the URI and it works:

  ...
  open("http://cdn.stereogum.com/mp3/My%20Morning%20Jacket%20-%20Celebration%20(Live).mp3")
do |src|
  ...

···

--
Posted via http://www.ruby-forum.com/.

4

Thank you guys very much!
I was able to get it to work by fixing my path.
I wasn't able to get it to work using alternate way even after changing the
URL.
I get the following error.

syntax error, unexpected kDO, expecting $end
do |src|

Just out of curiosity- how can I fix this.
I would like to know so that I can work through it and figure out exactly
what the script is doing and
compare it to the previous script.
Thanks again!

···

On Wed, Jan 14, 2009 at 4:30 AM, Brian Candler <b.candler@pobox.com> wrote:

Nathaniel Escribano wrote:
> require 'net/http'
>
> Net::HTTP.start("cdn.stereogum.com") { |http|
> resp = http.get("/mp3/My Morning Jacket - Celebration (Live).mp3")
> open("Celebration.mp3", "wb") { |file|
> file.write(resp.body)
> }
> }
> puts "the song has been downloaded"

Here is an alternative way of doing it:

require 'open-uri'
open("http://cdn.stereogum.com/mp3/My Morning Jacket - Celebration
(Live).mp3") do |src|
   open("Celebration.mp3","wb") do |dst|
     while blk = src.read(65536)
       dst.write(blk)
     end
   end
end

This gives a clear error:

/usr/lib/ruby/1.8/uri/common.rb:436:in `split': bad URI(is not URI?):
http://cdn.stereogum.com/mp3/My Morning Jacket - Celebration (Live).mp3
(URI::InvalidURIError)

Fix the URI and it works:

...
open("
http://cdn.stereogum.com/mp3/My%20Morning%20Jacket%20-%20Celebration%20(Live).mp3
")
do |src|
...
--
Posted via http://www.ruby-forum.com/.

5

Nathaniel Escribano wrote:

I get the following error.

syntax error, unexpected kDO, expecting $end
do |src|

It was a line-wrap from ruby-forum. Move this to the end of the line
above.

···

--
Posted via http://www.ruby-forum.com/.

6

Nathaniel Escribano wrote:
[...]

Here is an alternative way of doing it:

require 'open-uri'
open("http://cdn.stereogum.com/mp3/My Morning Jacket - Celebration
(Live).mp3") do |src|
   open("Celebration.mp3","wb") do |dst|
     while blk = src.read(65536)
       dst.write(blk)
     end
   end
end

[...]

My $ 0.02:

require 'open-uri'
require 'cgi'

url = 'http://cdn.stereogum.com/mp3/' + CGI::escape('My Morning Jacket -
Celebration (Live).mp3')

open(url) do |src|
  open('Celebration.mp3', 'wb') do |dst|
    while blk = src.read(65536)
      dst.write(blk)
    end
  end
end

  hth,

davi