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module AttachmentToHTML
module Adapters
# Convert application/pdf documents in to HTML
class PDF
TOO_MANY_IMAGES = 51
attr_reader :attachment, :tmpdir
# Public: Initialize a PDF converter
#
# attachment - the FoiAttachment to convert to HTML
# opts - a Hash of options (default: {}):
# :tmpdir - String name of directory to store the
# converted document
def initialize(attachment, opts = {})
@attachment = attachment
@tmpdir = opts.fetch(:tmpdir, ::Rails.root.join('tmp'))
end
# Public: The title to use in the <title> tag
#
# Returns a String
def title
@title ||= attachment.display_filename
end
# Public: The contents of the extracted html <body> tag
#
# Returns a String
def body
@body ||= parse_body
end
# Public: Was the document conversion successful?
#
# Returns a Boolean
def success?
return false if contains_too_many_images?
has_content? || contains_images?
end
private
def parse_body
conversion = convert
match = conversion ? conversion.match(/<body[^>]*>(.*?)<\/body>/mi) : nil
match ? match[1] : ''
end
def has_content?
!body.gsub(/\s+/,"").gsub(/\<[^\>]*\>/, "").empty?
end
def contains_images?
body.match(/<img[^>]*>/mi) ? true : false
end
# Works around https://bugs.freedesktop.org/show_bug.cgi?id=77932 in pdftohtml
def contains_too_many_images?
number_of_images_in_body >= TOO_MANY_IMAGES
end
def number_of_images_in_body
body.scan(/<img[^>]*>/i).size
end
def convert
# Get the attachment body outside of the chdir call as getting
# the body may require opening files too
text = attachment_body
@converted ||= Dir.chdir(tmpdir) do
tempfile = create_tempfile(text)
html = AlaveteliExternalCommand.run("pdftohtml",
"-nodrm", "-zoom", "1.0", "-stdout", "-enc", "UTF-8",
"-noframes", "./#{File.basename(tempfile.path)}",
:timeout => 30, :binary_output => false
)
cleanup_tempfile(tempfile)
html
end
end
def create_tempfile(text)
tempfile = if RUBY_VERSION.to_f >= 1.9
Tempfile.new('foiextract', '.',
:encoding => text.encoding)
else
Tempfile.new('foiextract', '.')
end
tempfile.print(text)
tempfile.flush
tempfile
end
def cleanup_tempfile(tempfile)
tempfile.close
tempfile.delete
end
def attachment_body
@attachment_body ||= attachment.body
end
end
end
end
|
