class ActiveStorage::Previewer::PopplerPDFPreviewer
Public Class Methods
accept?(blob)
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# File lib/active_storage/previewer/poppler_pdf_previewer.rb, line 6 def accept?(blob) blob.content_type == "application/pdf" && pdftoppm_exists? end
pdftoppm_exists?()
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# File lib/active_storage/previewer/poppler_pdf_previewer.rb, line 14 def pdftoppm_exists? return @pdftoppm_exists if defined?(@pdftoppm_exists) @pdftoppm_exists = system(pdftoppm_path, "-v", out: File::NULL, err: File::NULL) end
pdftoppm_path()
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# File lib/active_storage/previewer/poppler_pdf_previewer.rb, line 10 def pdftoppm_path ActiveStorage.paths[:pdftoppm] || "pdftoppm" end
Public Instance Methods
preview(**options) { |io: output, filename: "#{filename.base}.png", content_type: "image/png", **options| ... }
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# File lib/active_storage/previewer/poppler_pdf_previewer.rb, line 21 def preview(**options) 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", **options end end end
Private Instance Methods
draw_first_page_from(file, &block)
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# File lib/active_storage/previewer/poppler_pdf_previewer.rb, line 30 def draw_first_page_from(file, &block) # use 72 dpi to match thumbnail dimensions of the PDF draw self.class.pdftoppm_path, "-singlefile", "-cropbox", "-r", "72", "-png", file.path, &block end