Class: Decidim::Initiatives::PdfSignatureExample
- Inherits:
-
Object
- Object
- Decidim::Initiatives::PdfSignatureExample
- Defined in:
- decidim-initiatives/app/services/decidim/initiatives/pdf_signature_example.rb
Overview
Example of service to add a signature to a pdf
Instance Attribute Summary collapse
-
#pdf ⇒ Object
Returns the value of attribute pdf.
Instance Method Summary collapse
-
#initialize(args = {}) ⇒ PdfSignatureExample
constructor
Public: Initializes the service.
-
#signed_pdf ⇒ Object
Public: PDF signed using a new certificate generated by the service.
Constructor Details
#initialize(args = {}) ⇒ PdfSignatureExample
Public: Initializes the service. pdf - The pdf document to be signed
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# File 'decidim-initiatives/app/services/decidim/initiatives/pdf_signature_example.rb', line 14 def initialize(args = {}) @pdf = args.fetch(:pdf) end |
Instance Attribute Details
#pdf ⇒ Object
Returns the value of attribute pdf.
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# File 'decidim-initiatives/app/services/decidim/initiatives/pdf_signature_example.rb', line 10 def pdf @pdf end |
Instance Method Details
#signed_pdf ⇒ Object
Public: PDF signed using a new certificate generated by the service
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# File 'decidim-initiatives/app/services/decidim/initiatives/pdf_signature_example.rb', line 19 def signed_pdf signed_file = Tempfile.new("signed_pdf") doc = HexaPDF::Document.new(io: StringIO.new(pdf)) # Prepare the document for embedding of the digital signature data = nil # Used for storing the to-be-signed data signing_mechanism = lambda do |io, byte_range| # Store the to-be-signed data in the local variable data io.pos = byte_range[0] data = io.read(byte_range[1]) io.pos = byte_range[2] data << io.read(byte_range[3]) "" end doc.sign(signed_file.path, signature: (doc), reason: , signature_size: 10_000, external_signing: signing_mechanism) signature = OpenSSL::PKCS7.sign(certificate, key, data, # [HexaPDF.demo_cert.sub_ca, HexaPDF.demo_cert.root_ca], [], OpenSSL::PKCS7::DETACHED | OpenSSL::PKCS7::BINARY).to_der # Embed the signature HexaPDF::DigitalSignature::Signing.(File.open(signed_file.path, "rb+"), signature) File.binread(signed_file.path) ensure signed_file.close signed_file.unlink end |