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https://github.com/metachris/pdfx

Extract text, metadata and references (pdf, url, doi, arxiv) from PDF. Optionally download all referenced PDFs.
https://github.com/metachris/pdfx

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Extract text, metadata and references (pdf, url, doi, arxiv) from PDF. Optionally download all referenced PDFs.

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README 

        
# PDFx



![Build status for master branch](https://github.com/metachris/pdfx/workflows/Lint%20and%20test/badge.svg)

[![image](https://badge.fury.io/py/pdfx.svg)](https://pypi.python.org/pypi/pdfx)

[![image](https://img.shields.io/badge/license-Apache-blue.svg)](https://github.com/metachris/pdfx/blob/master/LICENSE)



## Introduction



Extract references (pdf, url, doi, arxiv) and metadata from a PDF.

Optionally download all referenced PDFs and check for broken links.



**Features**



-   Extract references and metadata from a given PDF

-   Detects pdf, url, arxiv and doi references

-   **Fast, parallel download of all referenced PDFs**

-   **Find broken hyperlinks** (using the `-c` flag)

    ([more](https://www.metachris.com/2016/03/find-broken-hyperlinks-in-a-pdf-document-with-pdfx/))

-   Output as text or JSON (using the `-j` flag)

-   Extract the PDF text (using the `--text` flag)

-   Use as command-line tool or Python package

-   Compatible with Python 2 and 3

-   Works with local and online pdfs



## Getting Started



Grab a copy of the code with `easy_install` or `pip`, and run it:



    $ sudo easy_install -U pdfx

    ...

    $ pdfx 



Run `pdfx -h` to see the help output:



    $ pdfx -h

    usage: pdfx [-h] [-d OUTPUT_DIRECTORY] [-c] [-j] [-v] [-t] [-o OUTPUT_FILE]

                [--version]

                pdf



    Extract metadata and references from a PDF, and optionally download all

    referenced PDFs. Visit https://www.metachris.com/pdfx for more information.



    positional arguments:

      pdf                   Filename or URL of a PDF file



    optional arguments:

      -h, --help            show this help message and exit

      -d OUTPUT_DIRECTORY, --download-pdfs OUTPUT_DIRECTORY

                            Download all referenced PDFs into specified directory

      -c, --check-links     Check for broken links

      -j, --json            Output infos as JSON (instead of plain text)

      -v, --verbose         Print all references (instead of only PDFs)

      -t, --text            Only extract text (no metadata or references)

      -o OUTPUT_FILE, --output-file OUTPUT_FILE

                            Output to specified file instead of console

      --version             show program's version number and exit



## Examples



Lets take a look at this paper:

:



    $ pdfx https://weakdh.org/imperfect-forward-secrecy.pdf

    Document infos:

    - CreationDate = D:20150821110623-04'00'

    - Creator = LaTeX with hyperref package

    - ModDate = D:20150821110805-04'00'

    - PTEX.Fullbanner = This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/Debian) kpathsea version 6.1.1

    - Pages = 13

    - Producer = pdfTeX-1.40.14

    - Title = Imperfect Forward Secrecy: How Diffie-Hellman Fails in Practice

    - Trapped = False

    - dc = {'title': {'x-default': 'Imperfect Forward Secrecy: How Diffie-Hellman Fails in Practice'}, 'creator': [None], 'description': {'x-default': None}, 'format': 'application/pdf'}

    - pdf = {'Keywords': None, 'Producer': 'pdfTeX-1.40.14', 'Trapped': 'False'}

    - pdfx = {'PTEX.Fullbanner': 'This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/Debian) kpathsea version 6.1.1'}

    - xap = {'CreateDate': '2015-08-21T11:06:23-04:00', 'ModifyDate': '2015-08-21T11:08:05-04:00', 'CreatorTool': 'LaTeX with hyperref package', 'MetadataDate': '2015-08-21T11:08:05-04:00'}

    - xapmm = {'InstanceID': 'uuid:4e570f88-cd0f-4488-85ad-03f4435a4048', 'DocumentID': 'uuid:98988d37-b43d-4c1a-965b-988dfb2944b6'}



    References: 36

    - URL: 18

    - PDF: 18



    PDF References:

    - http://www.spiegel.de/media/media-35533.pdf

    - http://www.spiegel.de/media/media-35513.pdf

    - http://www.spiegel.de/media/media-35509.pdf

    - http://www.spiegel.de/media/media-35529.pdf

    - http://www.spiegel.de/media/media-35527.pdf

    - http://cr.yp.to/factorization/smoothparts-20040510.pdf

    - http://www.spiegel.de/media/media-35517.pdf

    - http://www.spiegel.de/media/media-35526.pdf

    - http://www.spiegel.de/media/media-35519.pdf

    - http://www.spiegel.de/media/media-35522.pdf

    - http://cryptome.org/2013/08/spy-budget-fy13.pdf

    - http://www.spiegel.de/media/media-35515.pdf

    - http://www.spiegel.de/media/media-35514.pdf

    - http://www.hyperelliptic.org/tanja/SHARCS/talks06/thorsten.pdf

    - http://www.spiegel.de/media/media-35528.pdf

    - http://www.spiegel.de/media/media-35671.pdf

    - http://www.spiegel.de/media/media-35520.pdf

    - http://www.spiegel.de/media/media-35551.pdf



You can use the `-v` flag to output all references instead of just the

PDFs.



**Download all referenced pdfs** with `-d` (for `download-pdfs`) to the

specified directory (eg. to `/tmp/`):



    $ pdfx https://weakdh.org/imperfect-forward-secrecy.pdf -d /tmp/

    ...



To **extract text**, you can use the `-t` flag:



    # Extract text to console

    $ pdfx https://weakdh.org/imperfect-forward-secrecy.pdf -t



    # Extract text to file

    $ pdfx https://weakdh.org/imperfect-forward-secrecy.pdf -t -o pdf-text.txt



To **check for broken links** use the `-c` flag:



    $ pdfx https://weakdh.org/imperfect-forward-secrecy.pdf -c



\[Example (with video) of checking for broken

links\]().



## Usage as Python library



    >>> import pdfx

    >>> pdf = pdfx.PDFx("filename-or-url.pdf")

    >>> metadata = pdf.get_metadata()

    >>> references_list = pdf.get_references()

    >>> references_dict = pdf.get_references_as_dict()

    >>> pdf.download_pdfs("target-directory")



## Dev & Contributing



```bash

# Setup venv

python3 -m venv

venv . venv/bin/activate



# Install PDFx and dev deps

pip install -e .

pip install -r requirements_dev.txt



# Run tests and checks

make test

make lint

make check



# Format the code (with black)

make format

```



### Releasing



* Update version number in `setup.py` and `pdfx/__init__.py`

* Create a git tag starting with `v` (eg. `git tag v1.5.9`)

* Push the tag to GitHub: `git push --tags`



GitHub Actions is then publishing to PyPI.



## Various



- Author: Chris Hager [twitter.com/metachris](https://twitter.com/metachris)

- Homepage: https://www.metachris.com/pdfx

- License: Apache



Feedback, ideas and pull requests are welcome!



## Improvement Ideas



Possible:



- Timeout (see [#43](https://github.com/metachris/pdfx/issues/43))

- Cuts off links that span two lines [#40](https://github.com/metachris/pdfx/issues/40)

- Include Check-Links Results in Output [#39](https://github.com/metachris/pdfx/issues/39)