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https://github.com/paperless-ngx/paperless-ngx.git
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192 lines
7.5 KiB
ReStructuredText
192 lines
7.5 KiB
ReStructuredText
.. _extending:
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Paperless development
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#####################
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This section describes the steps you need to take to start development on paperless-ng.
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1. Check out the source from github. The repository is organized in the following way:
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* ``master`` always represents the latest release and will only see changes
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when a new release is made.
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* ``dev`` contains the code that will be in the next release.
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* ``feature-X`` contain bigger changes that will be in some release, but not
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necessarily the next one.
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Apart from that, the folder structure is as follows:
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* ``docs/`` - Documentation.
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* ``src-ui/`` - Code of the front end.
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* ``src/`` - Code of the back end.
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* ``scripts/`` - Various scripts that help with different parts of development.
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* ``docker/`` - Files required to build the docker image.
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2. Install some dependencies.
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* Python 3.6.
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* All dependencies listed in the :ref:`Bare metal route <setup-bare_metal>`
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* redis. You can either install redis or use the included scritps/start-services.sh
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to use docker to fire up a redis instance (and some other services such as tika,
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gotenberg and a postgresql server).
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Back end development
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====================
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The backend is a django application. I use PyCharm for development, but you can use whatever
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you want.
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Install the python dependencies by performing ``pipenv install --dev`` in the src/ directory.
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This will also create a virtual environment, which you can enter with ``pipenv shell`` or
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execute one-shot commands in with ``pipenv run``.
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Copy ``paperless.conf.example`` to ``paperless.conf`` and enable debug mode.
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Configure the IDE to use the src/ folder as the base source folder. Configure the following
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launch configurations in your IDE:
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* python3 manage.py runserver
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* python3 manage.py qcluster
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* python3 manage.py consumer
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Depending on which part of paperless you're developing for, you need to have some or all of
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them running.
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Testing and code style:
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* Run ``pytest`` in the src/ directory to execute all tests. This also generates a HTML coverage
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report. When runnings test, paperless.conf is loaded as well. However: the tests rely on the default
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configuration. This is not ideal. But for now, make sure no settings except for DEBUG are overridden when testing.
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* Run ``pycodestyle`` to test your code for issues with the configured code style settings.
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.. note::
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The line length rule E501 is generally useful for getting multiple source files
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next to each other on the screen. However, in some cases, its just not possible
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to make some lines fit, especially complicated IF cases. Append `` # NOQA: E501``
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to disable this check for certain lines.
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Front end development
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=====================
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The front end is build using angular. I use the ``Code - OSS`` IDE for development.
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In order to get started, you need ``npm``. Install the Angular CLI interface with
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.. code:: shell-session
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$ npm install -g @angular/cli
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and make sure that it's on your path. Next, in the src-ui/ directory, install the
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required dependencies of the project.
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.. code:: shell-session
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$ npm install
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You can launch a development server by running
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.. code:: shell-session
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$ ng serve
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This will automatically update whenever you save. However, in-place compilation might fail
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on syntax errors, in which case you need to restart it.
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By default, the development server is available on ``http://localhost:4200/`` and is configured
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to access the API at ``http://localhost:8000/api/``, which is the default of the backend.
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If you enabled DEBUG on the back end, several security overrides for allowed hosts, CORS and
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X-Frame-Options are in place so that the front end behaves exactly as in production. This also
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relies on you being logged into the back end. Without a valid session, The front end will simply
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not work.
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In order to build the front end and serve it as part of django, execute
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.. code:: shell-session
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$ ng build --prod
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This will build the front end and put it in a location from which the Django server will serve
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it as static content. This way, you can verify that authentication is working.
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Extending Paperless
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===================
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Paperless does not have any fancy plugin systems and will probably never have. However,
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some parts of the application have been designed to allow easy integration of additional
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features without any modification to the base code.
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Making custom parsers
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---------------------
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Paperless uses parsers to add documents to paperless. A parser is responsible for:
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* Retrieve the content from the original
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* Create a thumbnail
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* Optional: Retrieve a created date from the original
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* Optional: Create an archived document from the original
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Custom parsers can be added to paperless to support more file types. In order to do that,
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you need to write the parser itself and announce its existence to paperless.
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The parser itself must extend ``documents.parsers.DocumentParser`` and must implement the
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methods ``parse`` and ``get_thumbnail``. You can provide your own implementation to
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``get_date`` if you don't want to rely on paperless' default date guessing mechanisms.
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.. code:: python
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class MyCustomParser(DocumentParser):
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def parse(self, document_path, mime_type):
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# This method does not return anything. Rather, you should assign
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# whatever you got from the document to the following fields:
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# The content of the document.
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self.text = "content"
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# Optional: path to a PDF document that you created from the original.
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self.archive_path = os.path.join(self.tempdir, "archived.pdf")
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# Optional: "created" date of the document.
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self.date = get_created_from_metadata(document_path)
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def get_thumbnail(self, document_path, mime_type):
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# This should return the path to a thumbnail you created for this
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# document.
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return os.path.join(self.tempdir, "thumb.png")
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If you encounter any issues during parsing, raise a ``documents.parsers.ParseError``.
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The ``self.tempdir`` directory is a temporary directory that is guaranteed to be empty
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and removed after consumption finished. You can use that directory to store any
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intermediate files and also use it to store the thumbnail / archived document.
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After that, you need to announce your parser to paperless. You need to connect a
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handler to the ``document_consumer_declaration`` signal. Have a look in the file
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``src/paperless_tesseract/apps.py`` on how that's done. The handler is a method
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that returns information about your parser:
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.. code:: python
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def myparser_consumer_declaration(sender, **kwargs):
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return {
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"parser": MyCustomParser,
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"weight": 0,
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"mime_types": {
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"application/pdf": ".pdf",
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"image/jpeg": ".jpg",
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}
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}
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* ``parser`` is a reference to a class that extends ``DocumentParser``.
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* ``weight`` is used whenever two or more parsers are able to parse a file: The parser with
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the higher weight wins. This can be used to override the parsers provided by
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paperless.
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* ``mime_types`` is a dictionary. The keys are the mime types your parser supports and the value
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is the default file extension that paperless should use when storing files and serving them for
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download. We could guess that from the file extensions, but some mime types have many extensions
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associated with them and the python methods responsible for guessing the extension do not always
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return the same value.
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