Question

我正在开发一个使用prawn生成PDF的Rails应用程序。简而言之，我们希望能够对生成的PDF进行数字签名。我不知道从哪里开始准确阅读。只是想问一下其他人之前是否能够完成这项工作，如果是的话，我应该用什么样的资源来做这件事。

谢谢！

Answer 1

我建议你看看https://github.com/joseicosta/odf-report。它是生成ODF的宝石，但它们可以很容易地转换为PDF，而且它支持模板。

Answer 2

虽然这个问题已经回答并且相当陈旧，但我想添加相关链接以供参考。

VERSION 1 - 生成证书和密钥文件，并将它们直接插入到文档中

require 'openssl'

begin
  require 'origami'
rescue LoadError
  ORIGAMIDIR = "C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\origami-1.2.4\lib"
  $: << ORIGAMIDIR
  require 'origami'
end
include Origami

INPUTFILE = "Sample.pdf"
@inputfile = String.new(INPUTFILE)
OUTPUTFILE = @inputfile.insert(INPUTFILE.rindex("."),"_signed")
CERTFILE = "certificate.pem"
RSAKEYFILE = "private_key.pem"
passphrase = "your passphrase"

key4pem=File.read RSAKEYFILE

key = OpenSSL::PKey::RSA.new key4pem, passphrase
cert = OpenSSL::X509::Certificate.new(File.read CERTFILE)

pdf = PDF.read(INPUTFILE)
page = pdf.get_page(1)

# Add signature annotation (so it becomes visibles in pdf document)

sigannot = Annotation::Widget::Signature.new
sigannot.Rect = Rectangle[:llx => 89.0, :lly => 386.0, :urx => 190.0, :ury => 353.0]

page.add_annot(sigannot)

# Sign the PDF with the specified keys
pdf.sign(cert, key, 
  :method => 'adbe.pkcs7.sha1',
  :annotation => sigannot, 
  :location => "Portugal", 
  :contact => "myemail@email.tt", 
  :reason => "Proof of Concept"
)

# Save the resulting file
pdf.save(OUTPUTFILE)

版本2 - 使用现有证书签署pdf文件

import pygame
from colors import *


class Block (pygame.sprite.Sprite):

    def set_message(text):
        global message,previous_message
        message = font.render(text,True,black,white)
        previous_message=message

    def __init__(self, color =blue, width=64, height = 64):

        super( Block, self ).__init__()


        self.image = pygame.Surface((width, height))
        self.image.fill( color )
        self.rect=self.image.get_rect()
        self.sound=pygame.mixer.Sound("")
        self.origin_x = self.rect.centerx
        self.origin_y = self.rect.centery

    def set_properties(self):
        self.rect=self.image.get_rect()

        self.origin_x = self.rect.centerx
        self.origin_y = self.rect.centery

    def set_position (self, x, y):
        self.rect.x = x-self.origin_x
        self.rect.y = y-self.origin_y
    def set_image( self, filename = None ):
        if (filename !=None ):
            self.image = pygame.image.load (filename)
            self.set_properties()

    def play_sound(self):
        self.sound.play(-1)

if ( __name__ == "__main__"):
    pygame.init()
    window_size = window_width, window_height = 512, 384
    window = pygame.display.set_mode(window_size, pygame.RESIZABLE)

    pygame.display.set_caption( " Cloud Runner ")
    window.fill ( white )
    clock = pygame.time.Clock()
    frames_per_second = 60

    block_group = pygame.sprite.Group()
    a_block = Block()
    a_block.play_sound()
    a_block.set_image("beaten_brick_tiled.png")
    a_block.set_position( window_width/2, window_height/2)
    another_block = Block( red )
    another_block.set_position(100,100)
    block_group.add(a_block, another_block)


    font = pygame.font.SysFont("Times New Roman, Arial",30)

    message = previous_message = None
    set_message("Hello World!")


    running = True

    while ( running ):
        pygame.event.pump()
        for event in pygame.event.get():
            if (event.type == pygame.QUIT) or \
            (event.type ==pygame.KEYDOWN and  \
            (event.key == pygame.K_ESCAPE or event.key ==pygame.K_q)):
                running = False
            if (event.type == pygame.MOUSEMOTION):
                mouse_pos = pygame.mouse.get_pos()
                a_block.set_position(mouse_pos[0],mouse_pos[1])


        clock.tick (frames_per_second)
        window.fill ( white )
        if (message != previous_message):
            set_message(message)

        window.blit(message,(window_width/2 - message.get_rect().width/2,window_height/2-100))
        block_group.draw( window )
        pygame.display.update()

    pygame.quit()

使用Ruby或Ruby on Rails生成带签名的PDF

2 个答案: