Class: Geoblacklight::Download

Inherits:
Object
  • Object
show all
Defined in:
lib/geoblacklight/download.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(document, options = {}) ⇒ Download

Returns a new instance of Download.



5
6
7
8
# File 'lib/geoblacklight/download.rb', line 5

def initialize(document, options = {})
  @document = document
  @options = options
end

Class Method Details

.file_pathObject



18
19
20
# File 'lib/geoblacklight/download.rb', line 18

def self.file_path
  Settings.DOWNLOAD_PATH || Rails.root.join("tmp", "cache", "downloads")
end

Instance Method Details

#create_download_fileString

Creates temporary file on file system and renames it if download completes successfully. Will raise and rescue if the wrong file format is downloaded

Returns:

  • (String)

    filename of the completed download



42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
# File 'lib/geoblacklight/download.rb', line 42

def create_download_file
  download = initiate_download

  File.open("#{file_path_and_name}.tmp", "wb") do |file|
    fail Geoblacklight::Exceptions::WrongDownloadFormat unless matches_mimetype?(download)
    file.write download.body
  end
  File.rename("#{file_path_and_name}.tmp", file_path_and_name)
  file_name
rescue Geoblacklight::Exceptions::WrongDownloadFormat => error
  Geoblacklight.logger.error "#{error} expected #{@options[:content_type]} " \
                             "received #{download.headers["content-type"]}"
  File.delete("#{file_path_and_name}.tmp")
  raise Geoblacklight::Exceptions::ExternalDownloadFailed, message: "Wrong download type"
end

#download_exists?Boolean

Returns:

  • (Boolean)


26
27
28
# File 'lib/geoblacklight/download.rb', line 26

def download_exists?
  File.file?(file_path_and_name)
end

#downloadable?Boolean

Returns:

  • (Boolean)


10
11
12
# File 'lib/geoblacklight/download.rb', line 10

def downloadable?
  @document.downloadable?
end

#file_nameObject



14
15
16
# File 'lib/geoblacklight/download.rb', line 14

def file_name
  "#{@document.id}-#{@options[:type]}.#{@options[:extension]}"
end

#file_path_and_nameObject



22
23
24
# File 'lib/geoblacklight/download.rb', line 22

def file_path_and_name
  "#{self.class.file_path}/#{file_name}"
end

#getObject



30
31
32
33
34
35
36
# File 'lib/geoblacklight/download.rb', line 30

def get
  if download_exists?
    file_name
  else
    create_download_file
  end
end

#initiate_downloadFaraday::Request

Initiates download from a remote source url using the ‘request_params`. Will catch Faraday::ConnectionFailed and Faraday::TimeoutError

Returns:

  • (Faraday::Request)

    returns a Faraday::Request object



63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
# File 'lib/geoblacklight/download.rb', line 63

def initiate_download
  conn = Faraday.new(url: url)
  conn.get do |request|
    request.params = @options[:request_params]
    request.options.timeout = timeout
    request.options.open_timeout = timeout
  end
rescue Faraday::ConnectionFailed
  raise Geoblacklight::Exceptions::ExternalDownloadFailed,
    message: "Download connection failed",
    url: conn.url_prefix.to_s
rescue Faraday::TimeoutError
  raise Geoblacklight::Exceptions::ExternalDownloadFailed,
    message: "Download timed out",
    url: conn.url_prefix.to_s
end

#url_with_paramsString

Creates a download url for the object

Returns:

  • (String)


83
84
85
# File 'lib/geoblacklight/download.rb', line 83

def url_with_params
  url + "/?" + URI.encode_www_form(@options[:request_params])
end