我试图阻止用户上传这些类型的文件（实际上并不是不同的文件类型，因为它们在技术上仍然是 pdf）。
我尝试使用 pdfinfo
$ pdfinfo portfolio-sample.pdf
Title: Sample PDF Portfolio
Subject: Adobe Acrobat XI
Keywords: adobe, acrobat, xi, pdf, portfolio, sample
Creator: Adobe Acrobat Pro 10.1.3
Producer: Adobe Acrobat Pro 10.1.3
CreationDate: Thu Jun 21 15:03:15 2012 EDT
ModDate: Fri Sep 28 17:49:50 2012 EDT
Tagged: yes
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 1
Encrypted: no
Page size: 504 x 360 pts
Page rot: 0
File size: 3600732 bytes
Optimized: no
PDF version: 1.7
以及 exiftool
$ exiftool -a -G1 portfolio-sample.pdf
[ExifTool] ExifTool Version Number : 10.80
[System] File Name : portfolio-sample.pdf
[System] Directory : .
[System] File Size : 3.4 MB
[System] File Modification Date/Time : 2019:08:05 15:23:05-04:00
[System] File Access Date/Time : 2019:08:05 15:25:41-04:00
[System] File Inode Change Date/Time : 2019:08:05 15:23:10-04:00
[System] File Permissions : rw-rw-r--
[File] File Type : PDF
[File] File Type Extension : pdf
[File] MIME Type : application/pdf
[PDF] PDF Version : 1.7
[PDF] Linearized : No
[PDF] Create Date : 2012:06:21 15:03:15-04:00
[PDF] Creator : Adobe Acrobat Pro 10.1.3
[PDF] Keywords : adobe, acrobat, xi, pdf, portfolio, sample
[PDF] Modify Date : 2012:09:28 17:49:50-04:00
[PDF] Producer : Adobe Acrobat Pro 10.1.3
[PDF] Subject : Adobe Acrobat XI
[PDF] Title : Sample PDF Portfolio
[PDF] Language : en
[PDF] Tagged PDF : Yes
[PDF] Page Count : 1
[XMP-x] XMP Toolkit : Adobe XMP Core 5.4-c005 78.147326, 2012/08/23-13:03:03
[XMP-xmp] Modify Date : 2012:09:28 17:49:50-04:00
[XMP-xmp] Create Date : 2012:06:21 15:03:15-04:00
[XMP-xmp] Metadata Date : 2012:09:28 17:49:50-04:00
[XMP-xmp] Creator Tool : Adobe Acrobat Pro 10.1.3
[XMP-dc] Format : application/pdf
[XMP-dc] Title : Sample PDF Portfolio
[XMP-dc] Creator :
[XMP-dc] Description : Adobe Acrobat XI
[XMP-dc] Subject : adobe, acrobat, xi, pdf, portfolio, sample
[XMP-xmpMM] Document ID : uuid:2d7598db-3b0a-4510-bc0a-4ac1c570a3fa
[XMP-xmpMM] Instance ID : uuid:153f73de-3b2a-4d04-ab31-bb46ec3a5b79
[XMP-pdf] Producer : Adobe Acrobat Pro 10.1.3
[XMP-pdf] Keywords : adobe, acrobat, xi, pdf, portfolio, sample
但输出不显示任何将 pdf 标记为 Adobe Portfolio pdf 的标志。
答案1
您可以使用 python 模块python-poppler。
from poppler import load_from_file
pdf_document = load_from_file("portfolio-sample.pdf")
if pdf_document.has_embedded_files():
print("PDF contains Adobe Portfolio attachments")