如何在ROR中将word文件转换为PDF

Question

我正在使用 Libreconv gem 将 word 转换为 doc，但它不适用于 S3

bucket = Aws::S3::Bucket.new('bucket-name')
object = bucket.object file.attachment.blob.key
path = object.presigned_url(:get)
Libreconv.convert(path, "public/test.pdf")

如果我尝试使用 Libreconv 将此路径转换为 PDF，则会出现文件名太长错误。我已经在 ActiveJobs 下编写了这段代码。请根据 ActiveJobs 为我提供解决方案。

有人可以建议我如何将 word 文件转换为 pdf 文件。这里的路径是 https://domain.s3.amazonaws.com/Bf5qPUP3znZGCHCcTWHcR5Nn?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIZ6RZ7J425ORVUYQ%2F20181206%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20181206T051240Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=b89c47a324b2aa423bf64dfb343e3b3c90dce9b54fa9fe1bc4efa9c248e912f9

我得到的错误是

Error: source file could not be loaded *** Errno::ENAMETOOLONG Exception: File name too long @ rb_sysopen - /tmp/Bf5qPUP3znZGCHCcTWHcR5Nn?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIZ6RZ7J425ORVUYQ%2F20181206%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20181206T051240Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=b89c47a324b2aa423bf64dfb343e3b3c90dce9b54fa9fe1bc4efa9c248e912f9.pd

Answer 1

您的 PDF 似乎是使用从 S3 获取 docx 所需的所有参数创建的。

我想它发生在 this line:

target_tmp_file = "#{target_path}/#{File.basename(@source, ".*")}.#{File.basename(@convert_to, ":*")}"

@source 是 https://domain.s3.amazonaws.com/Bf5qPUP3znZGCHCcTWHcR5Nn?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIZ6RZ7J425ORVUYQ%2F20181206%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20181206T051240Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=b89c47a324b2aa423bf64dfb343e3b3c90dce9b54fa9fe1bc4efa9c248e912f9 和

> File.basename(@source, ".*")
=> "Bf5qPUP3znZGCHCcTWHcR5Nn?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIZ6RZ7J425ORVUYQ%2F20181206%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20181206T051240Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=b89c47a324b2aa423bf64dfb343e3b3c90dce9b54fa9fe1bc4efa9c248e912f9"

因此，Libreconv gem 尝试创建一个具有如此长名称的 tmp 文件，但它太长了 - 这就是引发错误的原因。

可能的解决方案：将过程拆分为单独的步骤来获取文件和转换文件。类似于：

require "open-uri"

bucket = Aws::S3::Bucket.new('bucket-name')
object = bucket.object file.attachment.blob.key
path = object.presigned_url(:get)

doc_file = open(path)
begin
  Libreconv.convert(doc_file.path, "public/test.pdf")
ensure
  doc_file.delete
end

Answer 2

following is the answer using combine pdf gem

tape = Tape.new(file)
result = tape.preview
tempfile = Tempfile.new(['foo', '.pdf'])
File.open(tempfile, 'wb') do |f|
  f.write result
end
path = tempfile.path
combine_pdf(path)

and for load file for S3 I have used

object = @bucket.object object_key
path = object.presigned_url(:get)
response = Net::HTTP.get_response(URI.parse(path)).body

如何在ROR中将word文件转换为PDF

How to convert word file to PDF in ROR

ruby-on-rails

amazon-s3

rails-activejob

rails-activestorage

ruby-on-rails-5.2