diff options
Diffstat (limited to 'activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb')
-rw-r--r-- | activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb b/activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb new file mode 100644 index 0000000000..2a787362cf --- /dev/null +++ b/activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb @@ -0,0 +1,35 @@ +# frozen_string_literal: true + +module ActiveStorage + class Previewer::PopplerPDFPreviewer < Previewer + class << self + def accept?(blob) + blob.content_type == "application/pdf" && pdftoppm_exists? + end + + def pdftoppm_path + ActiveStorage.paths[:pdftoppm] || "pdftoppm" + end + + def pdftoppm_exists? + return @pdftoppm_exists unless @pdftoppm_exists.nil? + + @pdftoppm_exists = system(pdftoppm_path, "-v", out: File::NULL, err: File::NULL) + end + end + + def preview + download_blob_to_tempfile do |input| + draw_first_page_from input do |output| + yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png" + end + end + end + + private + def draw_first_page_from(file, &block) + # use 72 dpi to match thumbnail dimesions of the PDF + draw self.class.pdftoppm_path, "-singlefile", "-r", "72", "-png", file.path, &block + end + end +end |