Class: Flickrcaptionr::Fetchers::Flickr

Inherits:
Base
  • Object
show all
Defined in:
lib/flickrcaptionr/fetchers/flickr.rb

Overview

Flickr Photo ID.

Instance Method Summary collapse

Methods inherited from Base

#download_file

Constructor Details

#initialize ⇒ Flickr

Returns a new instance of Flickr.



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# File 'lib/flickrcaptionr/fetchers/flickr.rb', line 6

def initialize
  @@api_key = Flickrcaptionr::Config.flickr_api_key
  @@flickr_regexes = [/(?:www\.flickr.com|secure\.flickr.com|flickr.com)+\/.+\/(\d+)\/.*$/,/^(\d+)$/]
end

Instance Method Details

#can_handle_url?(url) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/flickrcaptionr/fetchers/flickr.rb', line 44

def can_handle_url?(url)
  @@flickr_regexes.each do |regex|
    if regex.match(url)
      if @@api_key
        return true
      else
        raise Flickrcaptionr::FetcherNotConfiguredException, "Flickr API requires an API key!"
      end
    end
  end
  return false
end

#fetch(url) ⇒ Object 



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# File 'lib/flickrcaptionr/fetchers/flickr.rb', line 10

def fetch(url)
  unless @@api_key
    raise Flickrcaptionr::FetcherNotConfiguredException, "Flickr API requires an API key! Configure one in your configuration file."
  end
  photo_id = nil
  @@flickr_regexes.each do |regex|
    md = regex.match(url)
    if md
      photo_id = md[1]
    end 
  end
  unless photo_id
    raise Flickrcaptionr::RequestNotFetchableException, "Could not retrieve #{url}, couldn't figure out the photo ID from that URL"
  end
  api_req_uri = URI.parse("http://api.flickr.com/services/rest/?method=flickr.photos.getSizes&format=json&api_key=#{@@api_key}&photo_id=#{photo_id.to_s}")
  api_data = {}
  begin
    api_resp = Net::HTTP.get_response(api_req_uri) # Fetch it
    api_data = JSON.load(api_resp.body.gsub("jsonFlickrApi(","")[0..-2]) # Note we have to remove the JSONP chunks here so Ruby's JSON lib will parse it
  rescue Exception => e
    raise Flickrcaptionr::RequestNotFetchableException, "Could not retrieve #{url}, API request failed (underlying request URL #{api_req_uri.inspect})\n#{e.inspect}\n#{e.backtrace}"
  end
  # We now have data!
  if api_data['stat'] != 'ok'
    raise Flickrcaptionr::RequestNotFetchableException, "Could not retrieve #{url}, API request returned an error from Flickr! (underlying request URL #{api_req_uri.inspect}, response was #{api_data.inspect})"
  end
  if api_data['sizes']['candownload'] != 1
    raise Flickrcaptionr::RequestNotFetchableException, "Could not retrieve #{url}, image requested is not downloadable"
  end
  # We've now made sure we can fetch these.
  # Okay, now we want the biggest image we can lay our hands on.
  img = api_data['sizes']['size'].sort_by{|s|s['width'].to_i}.reverse[0]
  return img['source']
end