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69 lines
2.0 KiB
69 lines
2.0 KiB
# frozen_string_literal: true
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module Templates
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module ProcessDocument
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DPI = 200
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FORMAT = '.jpg'
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ATTACHMENT_NAME = 'preview_images'
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PDF_CONTENT_TYPE = 'application/pdf'
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Q = 35
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MAX_WIDTH = 1400
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module_function
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def call(attachment)
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if attachment.content_type == PDF_CONTENT_TYPE
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generate_pdf_preview_images(attachment)
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elsif attachment.content_type.starts_with?('image/')
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generate_preview_image(attachment)
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end
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attachment
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end
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def generate_preview_image(attachment)
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binary = attachment.download
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ActiveStorage::Attachment.where(name: ATTACHMENT_NAME, record: attachment).destroy_all
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image = Vips::Image.new_from_buffer(binary, '')
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image = image.resize(MAX_WIDTH / image.width.to_f)
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io = StringIO.new(image.write_to_buffer(FORMAT, Q: Q, interlace: true))
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ActiveStorage::Attachment.create!(
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blob: ActiveStorage::Blob.create_and_upload!(
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io:, filename: "0#{FORMAT}",
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metadata: { analyzed: true, identified: true, width: image.width, height: image.height }
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),
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name: ATTACHMENT_NAME,
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record: attachment
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)
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end
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def generate_pdf_preview_images(attachment)
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binary = attachment.download
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ActiveStorage::Attachment.where(name: ATTACHMENT_NAME, record: attachment).destroy_all
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number_of_pages = HexaPDF::Document.new(io: StringIO.new(binary)).pages.size - 1
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(0..number_of_pages).each do |page_number|
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page = Vips::Image.new_from_buffer(binary, '', dpi: DPI, page: page_number)
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page = page.resize(MAX_WIDTH / page.width.to_f)
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io = StringIO.new(page.write_to_buffer(FORMAT, Q: Q, interlace: true))
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ActiveStorage::Attachment.create!(
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blob: ActiveStorage::Blob.create_and_upload!(
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io:, filename: "#{page_number}#{FORMAT}",
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metadata: { analyzed: true, identified: true, width: page.width, height: page.height }
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),
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name: ATTACHMENT_NAME,
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record: attachment
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)
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end
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end
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end
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end
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