Class: ActiveStorage::Previewer::PopplerPDFPreviewer
Relationships & Source Files | |
Super Chains via Extension / Inclusion / Inheritance | |
Class Chain:
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Instance Chain:
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Inherits: |
ActiveStorage::Previewer
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Defined in: | activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb |
Class Attribute Summary
- .pdftoppm_exists? ⇒ Boolean readonly
Class Method Summary
::ActiveStorage::Previewer
- Inherited
Instance Attribute Summary
::ActiveStorage::Previewer
- Inherited
Instance Method Summary
::ActiveStorage::Previewer
- Inherited
#preview | Override this method in a concrete subclass. |
#download_blob_to_tempfile | Downloads the blob to a tempfile on disk. |
#draw | Executes a system command, capturing its binary output in a tempfile. |
#logger, #tmpdir |
Constructor Details
This class inherits a constructor from ActiveStorage::Previewer
Class Attribute Details
.pdftoppm_exists? ⇒ Boolean
(readonly)
[ GitHub ]
# File 'activestorage/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
Class Method Details
.accept?(blob) ⇒ Boolean
# File 'activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb', line 6
def accept?(blob) blob.content_type == "application/pdf" && pdftoppm_exists? end
.pdftoppm_path
[ GitHub ]# File 'activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb', line 10
def pdftoppm_path ActiveStorage.paths[:pdftoppm] || "pdftoppm" end
Instance Method Details
#preview(**options)
[ GitHub ]# File 'activestorage/lib/active_storage/previewer/poppler_pdf_previewer.rb', line 21
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