diff options
Diffstat (limited to 'activestorage/lib/active_storage/previewer')
3 files changed, 98 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/previewer/mupdf_previewer.rb b/activestorage/lib/active_storage/previewer/mupdf_previewer.rb new file mode 100644 index 0000000000..ae02a4889d --- /dev/null +++ b/activestorage/lib/active_storage/previewer/mupdf_previewer.rb @@ -0,0 +1,36 @@ +# frozen_string_literal: true + +module ActiveStorage + class Previewer::MuPDFPreviewer < Previewer + class << self + def accept?(blob) + blob.content_type == "application/pdf" && mutool_exists? + end + + def mutool_path + ActiveStorage.paths[:mutool] || "mutool" + end + + def mutool_exists? + return @mutool_exists unless @mutool_exists.nil? + + system mutool_path, out: File::NULL, err: File::NULL + + @mutool_exists = $?.exitstatus == 1 + 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) + draw self.class.mutool_path, "draw", "-F", "png", "-o", "-", file.path, "1", &block + end + end +end 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 diff --git a/activestorage/lib/active_storage/previewer/video_previewer.rb b/activestorage/lib/active_storage/previewer/video_previewer.rb new file mode 100644 index 0000000000..2f28a3d341 --- /dev/null +++ b/activestorage/lib/active_storage/previewer/video_previewer.rb @@ -0,0 +1,27 @@ +# frozen_string_literal: true + +module ActiveStorage + class Previewer::VideoPreviewer < Previewer + def self.accept?(blob) + blob.video? + end + + def preview + download_blob_to_tempfile do |input| + draw_relevant_frame_from input do |output| + yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png" + end + end + end + + private + def draw_relevant_frame_from(file, &block) + draw ffmpeg_path, "-i", file.path, "-y", "-vcodec", "png", + "-vf", "thumbnail", "-vframes", "1", "-f", "image2", "-", &block + end + + def ffmpeg_path + ActiveStorage.paths[:ffmpeg] || "ffmpeg" + end + end +end |