将pdf文件转换为base64字符串

Question

我的应用程序中有适用于Paperclip gem的文档（pdf，doc）。我需要通过邮寄请求将文档传递给其他第三方应用程序。

我试图通过Base64转换回形针附件，但会引发错误：没有将Tempfile隐式转换为String

这是我的做法：

# get url from the paperclip file
url = document.doc.url # https://s3-ap-southeast-1.amazonaws.com/xx-eng/documents/xx/000/000/xx/original/doc.pdf

file_data = open(url)

# Encode the bytes to base64 - this line throw error
base_64_file = Base64.encode64(file_data)

您对如何避免Tempfile错误有任何建议？

Answer 1

You need to read file first.

base_64_file = Base64.encode64(file_data.read)

Here is working example:

$ bundle exec rails c
=> file = open("tmp/file.pdf")
#> #<File:tmp/receipts.pdf>
=> base_64 = Base64.encode64(file)
#> TypeError: no implicit conversion of File into String
=> base_64 = Base64.encode64(file.read)
#> "JVBERi0xLjQKMSAwIG9iago8PAovVGl0b/BBQEPgQ ......J0ZgozMDM0OQolJUVPRgo=\n"