How do I download a file over HTTP using Ruby?
Probably the shortest way to download a file:
require 'open-uri'
download = open('http://example.com/download.pdf')
IO.copy_stream(download, '~/my_file.pdf')
require 'net/http'
#part of base library
Net::HTTP.start("your.webhost.com") { |http|
resp = http.get("/yourfile.xml")
open("yourfile.xml", "wb") { |file|
file.write(resp.body)
}
}
You can use open-uri, which is a one liner
require 'open-uri'
content = open('http://example.com').read
Simple...
response = Net::HTTP.get_response(URI.parse("yourURI"))
There are several ways, but the easiest is probably OpenURI. This blog post has some sample code, and also goes over Net::HTTP (with Hpricot) and Rio.
Related
I have a json file return by a web radio
require 'open-uri'
rquiire 'json'
songlist=open('http://douban.fm/j/mine/playlist?type=n&channel=0')
##this will return a json file:
##{"r":0,"song" [{"album":"\/subject\/25863639\/","picture":"http:\/\/img5.douban.com\/mpic\/s27256956.jpg","ssid":"7656","artist":"Carousel Kings","url":"http:\/\/mr3.douban.com\/201404122019\/660a1b4494a255e0333dfdc9ffadcf08\/view\/song\/small\/p2055547.mp3","company":"Not On Label","title":"Silence","rating_avg":3.73866,"length":194,"subtype":"","public_time":"2014","sid":"2055547","aid":"25863639","sha256":"ebf027adfaf9882118456941a774eeb509c29c4c278f55f587ba2faaa858a49d","kbps":"64","albumtitle":"Unity","like":false}]
I want to get the information like this song[0]['url'], song[0]['title'],song[0]['album']and using smplayer in terminal to play the song by pointed by url.
How can i do that with ruby?
Thanks.
I would use JSON.parse as below
require 'open-uri'
require 'json'
songlist = open('http://douban.fm/j/mine/playlist?type=n&channel=0').read
parsed_songlist = JSON.parse(songlist)
parsed_songlist["song"][0]["url"] #=> "http:\/\/mr3.douban.com\/201404122019\/660a1b4494a255e0333dfdc9ffadcf08\/view\/song\/small\/p2055547.mp3"
parsed_songlist["song"][0]["title"] #=> "Silence"
I've found good examples of NET::HTTP for downloading an image file, and I've found good examples of creating a temp file. But I don't see how I can use these libraries together. I.e., how would the creation of the temp file be worked into this code for downloading a binary file?
require 'net/http'
Net::HTTP.start("somedomain.net/") do |http|
resp = http.get("/flv/sample/sample.flv")
open("sample.flv", "wb") do |file|
file.write(resp.body)
end
end
puts "Done."
There are more api-friendly libraries than Net::HTTP, for example httparty:
require "httparty"
url = "https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/DahliaDahlstarSunsetPink.jpg/250px-DahliaDahlstarSunsetPink.jpg"
File.open("/tmp/my_file.jpg", "wb") do |f|
f.write HTTParty.get(url).body
end
require 'net/http'
require 'tempfile'
require 'uri'
def save_to_tempfile(url)
uri = URI.parse(url)
Net::HTTP.start(uri.host, uri.port) do |http|
resp = http.get(uri.path)
file = Tempfile.new('foo', Dir.tmpdir, 'wb+')
file.binmode
file.write(resp.body)
file.flush
file
end
end
tf = save_to_tempfile('http://a.fsdn.com/sd/topics/transportation_64.png')
tf # => #<File:/var/folders/sj/2d7czhyn0ql5n3_2tqryq3f00000gn/T/foo20130827-58194-7a9j19>
I like to use RestClient:
file = File.open("/tmp/image.jpg", 'wb' ) do |output|
output.write RestClient.get("http://image_url/file.jpg")
end
Though the answers above work totally fine, I thought I would mention that it is also possible to just use the good ol' curl command to download the file into a temporary location. This was the use case that I needed for myself. Here's a rough idea of the code:
# Set up the temp file:
file = Tempfile.new(['filename', '.jpeg'])
#Make the curl request:
url = "http://example.com/image.jpeg"
curlString = "curl --silent -X GET \"#{url}\" -o \"#{file.path}\""
curlRequest = `#{curlString}`
If you like to download a file using HTTParty you can use the following code.
resp = HTTParty.get("https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png")
file = Tempfile.new
file.binmode
file.write(resp.body)
file.rewind
Further, if you want to store the file in ActiveStorage refer below code.
object.images.attach(io: file, filename: "Test.png")
Is there a way of accessing this dialog box to get the file name or to save this file somewhere so i can access it later. I am using Ruby mechanize to navigate through the website to get to this screen.
There is no dialog with mechanize. You submit the form, that returns a Mechanize::File object, and you can then save that like so:
file = form.submit
File.open('myfile','w'){|f| f << file.body}
I would do it this way.
Use nokogiri to open the page:
#doc = Nokogiri::HTML(open(url))
go through the doc page and find that link for download.
then you can use something link this:
require 'net/http'
Net::HTTP.start('theserver.com') { |http|
resp = http.get('/xx/the_file_to_downlaod.csv')
open('the_downlaod.csv', 'wb') { |file|
file.write(resp.body)
}
}
What is the most efficient way to get the content-type of a given URL using Ruby?
This is what I'd do if I want simple code:
require 'open-uri'
str = open('http://example.com')
str.content_type #=> "text/html"
The big advantage is it follows redirects.
If you're checking a bunch of URLs you might want to call close on the handles after you've found what you want.
Take a look at the Net::HTTP library.
require 'net/http'
response = nil
uri, path = 'google.com', '/'
Net::HTTP.start(uri, 80) { |http| response = http.head(path) }
p response['content-type']
I'm trying to call resources (images, for example.) from my website to avoid constant updates. Thus far, I've tried just using this:
#sprite.bitmap = Bitmap.new("http://www.minscandboo.com/minscgame/001-Title01.jpg")
But, this just gives "File not found error". What is the correct method for achieving this?
Try using Net::HTTP to get a local file first:
require 'net/http'
Net::HTTP.start("minscandboo.com") { |http|
resp = http.get("/miscgame/001-Title01.jpg")
open("local-game-image.jpg", "wb") { |file|
file.write(resp.body)
}
}
# ...
#sprite.bitmap = Bitmap.new("local-game-image.jpg")