Class: SourceMonitor::Images::Downloader

Inherits:
Object
  • Object
show all
Defined in:
lib/source_monitor/images/downloader.rb

Defined Under Namespace

Classes: Result

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url, settings: nil) ⇒ Downloader

Returns a new instance of Downloader.



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# File 'lib/source_monitor/images/downloader.rb', line 13

def initialize(url, settings: nil)
  @url = url
  @settings = settings || SourceMonitor.config.images
end

Instance Attribute Details

#settings ⇒ Object (readonly)

Returns the value of attribute settings.



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# File 'lib/source_monitor/images/downloader.rb', line 11

def settings
  @settings
end

#url ⇒ Object (readonly)

Returns the value of attribute url.



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# File 'lib/source_monitor/images/downloader.rb', line 11

def url
  @url
end

Instance Method Details

#call ⇒ Object

Downloads the image and returns a Result, or nil if download fails or the image does not meet validation criteria.



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# File 'lib/source_monitor/images/downloader.rb', line 20

def call
  response = fetch_image
  return unless response

  content_type = response.headers["content-type"]&.split(";")&.first&.strip&.downcase
  return unless allowed_content_type?(content_type)

  body = response.body
  return unless body && body.bytesize > 0
  return if body.bytesize > settings.max_download_size

  filename = derive_filename(url, content_type)

  Result.new(
    io: StringIO.new(body),
    filename: filename,
    content_type: content_type,
    byte_size: body.bytesize
  )
rescue Faraday::Error, URI::InvalidURIError, Timeout::Error
  nil
end