added file preview generation for Docker, base model to generate cropped images

akarpov/blog/signals.py

@@ -1,33 +1,10 @@
-from django.db.models.signals import post_save, pre_delete, pre_save
+from django.db.models.signals import pre_delete, pre_save
 from django.dispatch import receiver
 
-from akarpov.blog.models import Post, PostRating, Tag
-from akarpov.common.tasks import crop_model_image
+from akarpov.blog.models import PostRating, Tag
 from akarpov.utils.generators import generate_hex_color
 
 
-@receiver(pre_save, sender=Post)
-def post_on_save(sender, instance: Post, **kwargs):
-    if instance.id:
-        previous = Post.objects.get(id=instance.id)
-        if (
-            previous.image != instance.image
-            and kwargs["update_fields"] != frozenset({"image_cropped"})
-            and instance
-        ):
-            if instance.image:
-                crop_model_image.apply_async(
-                    kwargs={
-                        "pk": instance.pk,
-                        "app_label": "blog",
-                        "model_name": "Post",
-                    },
-                    countdown=2,
-                )
-            else:
-                instance.image_cropped = None
-
-
 @receiver(pre_save, sender=Tag)
 def tag_create(sender, instance: Tag, **kwargs):
     if instance.id is None:
@@ -71,17 +48,3 @@ def post_rating_delete(sender, instance: PostRating, **kwargs):
         post.rating += 1
         post.rating_down -= 1
     post.save()
-
-
-@receiver(post_save, sender=Post)
-def post_on_create(sender, instance: Post, created, **kwargs):
-    if created:
-        if instance.image:
-            crop_model_image.apply_async(
-                kwargs={
-                    "pk": instance.pk,
-                    "app_label": "blog",
-                    "model_name": "Post",
-                },
-                countdown=2,
-            )

akarpov/common/models.py

@@ -1,13 +1,73 @@
+import os
+
 from django.db import models
 
+from akarpov.common.tasks import crop_model_image
 from akarpov.utils.files import user_file_upload_mixin
 from akarpov.utils.generators import generate_charset
 
 
+def create_cropped_model_image(sender, instance, created, **kwargs):
+    model = sender
+    if created:
+        if instance.image:
+            crop_model_image.apply_async(
+                kwargs={
+                    "pk": instance.pk,
+                    "app_label": model._meta.app_label,
+                    "model_name": model._meta.model_name,
+                },
+                countdown=2,
+            )
+
+
+def update_cropped_model_image(sender, instance, **kwargs):
+    model = sender
+    if instance.id:
+        previous = model.objects.get(id=instance.id)
+        if previous.image != instance.image:
+            # delete previous cropped image
+            if instance.image_cropped:
+                if os.path.isfile(instance.image_cropped.path):
+                    os.remove(instance.image_cropped.path)
+            # run task to create new cropped image
+            if kwargs["update_fields"] != frozenset({"image_cropped"}) and instance:
+                if instance.image:
+                    crop_model_image.apply_async(
+                        kwargs={
+                            "pk": instance.pk,
+                            "app_label": model._meta.app_label,
+                            "model_name": model._meta.model_name,
+                        },
+                        countdown=2,
+                    )
+                else:
+                    instance.image_cropped = None
+
+
+def delete_cropped_model_image(sender, instance, **kwargs):
+    print(instance.image_cropped)
+    if instance.image_cropped:
+        if os.path.isfile(instance.image_cropped.path):
+            os.remove(instance.image_cropped.path)
+
+
 class BaseImageModel(models.Model):
+    """
+    stores user's images in their media folder, creates, updates and deletes preview
+    requires celery to run
+    """
+
     image = models.ImageField(upload_to=user_file_upload_mixin, blank=True)
     image_cropped = models.ImageField(upload_to="cropped/", blank=True)
 
+    @classmethod
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        models.signals.pre_save.connect(update_cropped_model_image, sender=cls)
+        models.signals.post_save.connect(create_cropped_model_image, sender=cls)
+        models.signals.post_delete.connect(delete_cropped_model_image, sender=cls)
+
     class Meta:
         abstract = True
 

akarpov/files/admin.py

@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from akarpov.files.models import BaseFile, Folder
+from akarpov.files.models import File, Folder
 
-admin.site.register(BaseFile)
+admin.site.register(File)
 admin.site.register(Folder)

akarpov/files/migrations/0007_file_alter_folder_parent_delete_basefile_file_folder_and_more.py

@@ -0,0 +1,108 @@
+# Generated by Django 4.1.7 on 2023-03-24 13:50
+
+import akarpov.utils.files
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+import model_utils.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("shortener", "0001_initial"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("files", "0006_alter_basefile_slug"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="File",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("slug", models.SlugField(blank=True, max_length=20, unique=True)),
+                (
+                    "created",
+                    model_utils.fields.AutoCreatedField(
+                        default=django.utils.timezone.now,
+                        editable=False,
+                        verbose_name="created",
+                    ),
+                ),
+                (
+                    "modified",
+                    model_utils.fields.AutoLastModifiedField(
+                        default=django.utils.timezone.now,
+                        editable=False,
+                        verbose_name="modified",
+                    ),
+                ),
+                ("name", models.CharField(max_length=100)),
+                ("description", models.TextField(blank=True)),
+                ("private", models.BooleanField(default=True)),
+                ("preview", models.FileField(blank=True, upload_to="file/previews/")),
+                (
+                    "file",
+                    models.FileField(
+                        upload_to=akarpov.utils.files.user_file_upload_mixin
+                    ),
+                ),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.AlterField(
+            model_name="folder",
+            name="parent",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="children",
+                to="files.folder",
+            ),
+        ),
+        migrations.DeleteModel(
+            name="BaseFile",
+        ),
+        migrations.AddField(
+            model_name="file",
+            name="folder",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="files",
+                to="files.folder",
+            ),
+        ),
+        migrations.AddField(
+            model_name="file",
+            name="short_link",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                to="shortener.link",
+            ),
+        ),
+        migrations.AddField(
+            model_name="file",
+            name="user",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="files",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+    ]

akarpov/files/models.py

@@ -14,7 +14,7 @@
 from akarpov.utils.files import user_file_upload_mixin
 
 
-class BaseFile(TimeStampedModel, ShortLink):
+class File(TimeStampedModel, ShortLink):
     """model to store user's files"""
 
     name = CharField(max_length=100)
@@ -27,6 +27,7 @@ class BaseFile(TimeStampedModel, ShortLink):
         "files.Folder", related_name="files", blank=True, null=True, on_delete=CASCADE
     )
 
+    preview = FileField(blank=True, upload_to="file/previews/")
     file = FileField(blank=False, upload_to=user_file_upload_mixin)
 
     def get_absolute_url(self):
@@ -41,7 +42,9 @@ class Folder(TimeStampedModel, ShortLink):
     slug = SlugField(max_length=20, blank=True)
 
     user = ForeignKey("users.User", related_name="files_folders", on_delete=CASCADE)
-    parent = ForeignKey("self", blank=True, related_name="children", on_delete=CASCADE)
+    parent = ForeignKey(
+        "self", null=True, blank=True, related_name="children", on_delete=CASCADE
+    )
 
     def get_absolute_url(self):
         return reverse("files:folder", kwargs={"slug": self.slug})

akarpov/files/services/preview.py

@@ -76,5 +76,5 @@ def _font_points_to_pixels(pt):
 def create_preview(file_path: str) -> str:
     # TODO: add text image generation/code image
     manager = PreviewManager(cache_path, create_folder=True)
-    path_to_preview_image = manager.get_jpeg_preview(file_path)
+    path_to_preview_image = manager.get_pdf_preview(file_path)
     return path_to_preview_image

akarpov/files/signals.py

@@ -0,0 +1,16 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+from akarpov.files.models import File
+from akarpov.files.tasks import generate_file_review
+
+
+@receiver(post_save, sender=File)
+def post_on_create(sender, instance: File, created, **kwargs):
+    if created:
+        generate_file_review.apply_async(
+            kwargs={
+                "pk": instance.pk,
+            },
+            countdown=2,
+        )

akarpov/files/tasks.py

@@ -0,0 +1,19 @@
+from celery import shared_task
+from django.core.files import File
+
+from akarpov.files.models import File as FileModel
+from akarpov.files.services.preview import create_preview
+
+
+@shared_task()
+def generate_file_review(pk: int):
+    file = FileModel.objects.get(pk=pk)
+    pth = create_preview(file.file)
+    with open(pth, "rb") as f:
+        file.preview.save(
+            pth.split("/")[-1],
+            File(f.read()),
+            save=False,
+        )
+    file.save(update_fields=["preview"])
+    return pk

akarpov/files/views.py

@@ -1,11 +1,11 @@
 from django.views.generic import DetailView
 
-from akarpov.files.models import BaseFile, Folder
+from akarpov.files.models import File, Folder
 
 
 class FileView(DetailView):
     template_name = "files/view.html"
-    model = BaseFile
+    model = File
     slug_field = "slug"
 
 

akarpov/test_platform/signals.py

@@ -1,41 +0,0 @@
-from django.db.models.signals import post_save, pre_save
-from django.dispatch import receiver
-
-from akarpov.common.tasks import crop_model_image
-from akarpov.test_platform.models import Form
-
-
-@receiver(post_save, sender=Form)
-def form_on_create(sender, instance: Form, created, **kwargs):
-    if created:
-        if instance.image:
-            crop_model_image.apply_async(
-                kwargs={
-                    "pk": instance.pk,
-                    "app_label": "test_platform",
-                    "model_name": "Form",
-                },
-                countdown=2,
-            )
-
-
-@receiver(pre_save, sender=Form)
-def form_on_save(sender, instance: Form, **kwargs):
-    if instance.id:
-        previous = Form.objects.get(id=instance.id)
-        if (
-            previous.image != instance.image
-            and kwargs["update_fields"] != frozenset({"image_cropped"})
-            and instance
-        ):
-            if instance.image:
-                crop_model_image.apply_async(
-                    kwargs={
-                        "pk": instance.pk,
-                        "app_label": "test_platform",
-                        "model_name": "Form",
-                    },
-                    countdown=2,
-                )
-            else:
-                instance.image_cropped = None

akarpov/users/signals.py

@@ -1,43 +0,0 @@
-from django.db.models.signals import post_save, pre_save
-from django.dispatch import receiver
-
-from akarpov.common.tasks import crop_model_image
-from akarpov.users.models import User
-
-
-@receiver(pre_save, sender=User)
-def on_change(sender, instance: User, **kwargs):
-    if instance.id is None:  # new object will be created
-        pass
-    else:
-        previous = User.objects.get(id=instance.id)
-        if previous.image != instance.image and kwargs["update_fields"] != frozenset(
-            {"image_cropped"}
-        ):
-            if instance.image:
-                crop_model_image.apply_async(
-                    kwargs={
-                        "pk": instance.pk,
-                        "app_label": "users",
-                        "model_name": "User",
-                    },
-                    countdown=2,
-                )
-            else:
-                instance.image_cropped = None
-                instance.save()
-
-
-@receiver(post_save, sender=User)
-def post_on_create(sender, instance: User, created, **kwargs):
-    if created:
-        if instance.image:
-            if instance.image:
-                crop_model_image.apply_async(
-                    kwargs={
-                        "pk": instance.pk,
-                        "app_label": "users",
-                        "model_name": "User",
-                    },
-                    countdown=2,
-                )

compose/local/django/Dockerfile

@@ -16,6 +16,7 @@ ARG BUILD_ENVIRONMENT=local
 ARG APP_HOME=/app
 
 ENV PYTHONUNBUFFERED 1
+ENV DRAWIO_VERSION 15.7.3
 ENV PYTHONDONTWRITEBYTECODE 1
 ENV BUILD_ENV ${BUILD_ENVIRONMENT}
 
@@ -24,16 +25,21 @@ WORKDIR ${APP_HOME}
 # Install required system dependencies
 RUN apt-get update && \
     apt-get install -y build-essential libpq-dev gettext libmagic-dev libjpeg-dev zlib1g-dev && \
+    # Dependencies for file preview generation
+    # apt-get install -y poppler-utils libfile-mimeinfo-perl libimage-exiftool-perl ghostscript libsecret-1-0 zlib1g-dev libjpeg-dev imagemagick libmagic1 webp libreoffice inkscape ffmpeg xvfb && \
     apt-get purge -y --auto-remove -o APT:AutoRemove:RecommendsImportant=false && \
     rm -rf /var/lib/apt/lists/*
 
 RUN curl -sSL https://install.python-poetry.org | python3 -
+# Dependencies for file preview generation
+# RUN curl -LO https://github.com/jgraph/drawio-desktop/releases/download/v${DRAWIO_VERSION}/drawio-x86_64-${DRAWIO_VERSION}.AppImage && mv drawio-x86_64-${DRAWIO_VERSION}.AppImage /usr/local/bin/drawio
 ENV PATH="/root/.local/bin:$PATH"
 
 RUN poetry config virtualenvs.create false
 
 COPY ./pyproject.toml ./poetry.lock /app/
 RUN poetry install --no-root --only main
+RUN preview --check-dependencies
 
 
 COPY ./compose/production/django/entrypoint /entrypoint

poetry.lock

@@ -285,6 +285,48 @@ d = ["aiohttp (>=3.7.4)"]
 jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
 uvloop = ["uvloop (>=0.15.2)"]
 
+[[package]]
+name = "cairocffi"
+version = "1.5.0"
+description = "cffi-based cairo bindings for Python"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "cairocffi-1.5.0.tar.gz", hash = "sha256:d105b49009d9b4970a459e38ff030cb5dfc8c8ee231e867d28f77ee9df44495e"},
+]
+
+[package.dependencies]
+cffi = ">=1.1.0"
+
+[package.extras]
+doc = ["sphinx", "sphinx_rtd_theme"]
+test = ["flake8", "isort", "numpy", "pikepdf", "pytest"]
+xcb = ["xcffib (>=0.3.2)"]
+
+[[package]]
+name = "cairosvg"
+version = "2.7.0"
+description = "A Simple SVG Converter based on Cairo"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+files = [
+    {file = "CairoSVG-2.7.0-py3-none-any.whl", hash = "sha256:17cb96423a896258848322a95c80160e714a58f1af3dd73b8e1750994519b9f9"},
+    {file = "CairoSVG-2.7.0.tar.gz", hash = "sha256:ac4dc7c1d38b3a15717db2633a3a383012e0be664c727c911637e6af6a49293c"},
+]
+
+[package.dependencies]
+cairocffi = "*"
+cssselect2 = "*"
+defusedxml = "*"
+pillow = "*"
+tinycss2 = "*"
+
+[package.extras]
+doc = ["sphinx", "sphinx-rtd-theme"]
+test = ["flake8", "isort", "pytest"]
+
 [[package]]
 name = "celery"
 version = "5.2.7"
@@ -767,6 +809,26 @@ test = ["hypothesis (>=1.11.4,!=3.79.2)", "iso8601", "pretend", "pytest (>=6.2.0
 test-randomorder = ["pytest-randomly"]
 tox = ["tox"]
 
+[[package]]
+name = "cssselect2"
+version = "0.7.0"
+description = "CSS selectors for Python ElementTree"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "cssselect2-0.7.0-py3-none-any.whl", hash = "sha256:fd23a65bfd444595913f02fc71f6b286c29261e354c41d722ca7a261a49b5969"},
+    {file = "cssselect2-0.7.0.tar.gz", hash = "sha256:1ccd984dab89fc68955043aca4e1b03e0cf29cad9880f6e28e3ba7a74b14aa5a"},
+]
+
+[package.dependencies]
+tinycss2 = "*"
+webencodings = "*"
+
+[package.extras]
+doc = ["sphinx", "sphinx_rtd_theme"]
+test = ["flake8", "isort", "pytest"]
+
 [[package]]
 name = "decorator"
 version = "5.1.1"
@@ -1539,6 +1601,24 @@ files = [
 [package.dependencies]
 python-dateutil = ">=2.4"
 
+[[package]]
+name = "ffmpeg-python"
+version = "0.2.0"
+description = "Python bindings for FFmpeg - with complex filtering support"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "ffmpeg-python-0.2.0.tar.gz", hash = "sha256:65225db34627c578ef0e11c8b1eb528bb35e024752f6f10b78c011f6f64c4127"},
+    {file = "ffmpeg_python-0.2.0-py3-none-any.whl", hash = "sha256:ac441a0404e053f8b6a1113a77c0f452f1cfc62f6344a769475ffdc0f56c23c5"},
+]
+
+[package.dependencies]
+future = "*"
+
+[package.extras]
+dev = ["Sphinx (==2.1.0)", "future (==0.17.1)", "numpy (==1.16.4)", "pytest (==4.6.1)", "pytest-mock (==1.10.4)", "tox (==3.12.1)"]
+
 [[package]]
 name = "filelock"
 version = "3.9.0"
@@ -1622,6 +1702,17 @@ files = [
     {file = "funcy-1.18.tar.gz", hash = "sha256:15448d19a8ebcc7a585afe7a384a19186d0bd67cbf56fb42cd1fd0f76313f9b2"},
 ]
 
+[[package]]
+name = "future"
+version = "0.18.3"
+description = "Clean single-source support for Python 3 and 2"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "future-0.18.3.tar.gz", hash = "sha256:34a17436ed1e96697a86f9de3d15a3b0be01d8bc8de9c1dffd59fb8234ed5307"},
+]
+
 [[package]]
 name = "gunicorn"
 version = "20.1.0"
@@ -2527,6 +2618,37 @@ nodeenv = ">=0.11.1"
 pyyaml = ">=5.1"
 virtualenv = ">=20.10.0"
 
+[[package]]
+name = "preview-generator"
+version = "0.29"
+description = "A library for generating preview (thumbnails, text or json overview) for file-based content"
+category = "main"
+optional = false
+python-versions = ">= 3.7"
+files = [
+    {file = "preview_generator-0.29.tar.gz", hash = "sha256:343978dace795b4b9da862d96f2e4a9c088e58a255c32a97ecd8729d4947377a"},
+]
+
+[package.dependencies]
+cairosvg = {version = "*", optional = true, markers = "extra == \"all\""}
+ffmpeg-python = {version = "*", optional = true, markers = "extra == \"all\""}
+filelock = "*"
+pyexifinfo = "*"
+python-magic = "*"
+Wand = "*"
+xvfbwrapper = {version = "*", optional = true, markers = "extra == \"all\""}
+
+[package.extras]
+3d = ["vtk"]
+all = ["cairosvg", "ffmpeg-python", "xvfbwrapper", "xvfbwrapper"]
+cairosvg = ["cairosvg"]
+dev = ["ImageHash", "black", "flake8", "isort", "mypy", "pre-commit", "pytest", "pytest-dotenv"]
+drawio = ["xvfbwrapper"]
+raw = ["rawpy"]
+scribus = ["xvfbwrapper"]
+testing = ["ImageHash", "pytest", "pytest-dotenv"]
+video = ["ffmpeg-python"]
+
 [[package]]
 name = "prometheus-client"
 version = "0.16.0"
@@ -2716,6 +2838,31 @@ files = [
     {file = "pycparser-2.21.tar.gz", hash = "sha256:e644fdec12f7872f86c58ff790da456218b10f863970249516d60a5eaca77206"},
 ]
 
+[[package]]
+name = "pydotplus"
+version = "2.0.2"
+description = "Python interface to Graphviz's Dot language"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "pydotplus-2.0.2.tar.gz", hash = "sha256:91e85e9ee9b85d2391ead7d635e3d9c7f5f44fd60a60e59b13e2403fa66505c4"},
+]
+
+[package.dependencies]
+pyparsing = ">=2.0.1"
+
+[[package]]
+name = "pyexifinfo"
+version = "0.4.0"
+description = "Simple Metadata extraction using Exiftool"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "pyexifinfo-0.4.0.tar.gz", hash = "sha256:578b34b3c593fe77bbe6b62588f9f2ec679dca63f7d486148c9a6ff1fdd4bdc9"},
+]
+
 [[package]]
 name = "pyflakes"
 version = "3.0.1"
@@ -2840,6 +2987,21 @@ files = [
 [package.dependencies]
 pylint = ">=1.7"
 
+[[package]]
+name = "pyparsing"
+version = "3.0.9"
+description = "pyparsing module - Classes and methods to define and execute parsing grammars"
+category = "main"
+optional = false
+python-versions = ">=3.6.8"
+files = [
+    {file = "pyparsing-3.0.9-py3-none-any.whl", hash = "sha256:5026bae9a10eeaefb61dab2f09052b9f4307d44aee4eda64b309723d8d206bbc"},
+    {file = "pyparsing-3.0.9.tar.gz", hash = "sha256:2b020ecf7d21b687f219b71ecad3631f644a47f01403fa1d1036b0c6416d70fb"},
+]
+
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
+
 [[package]]
 name = "pyrsistent"
 version = "0.19.3"
@@ -3461,6 +3623,25 @@ files = [
     {file = "text_unidecode-1.3-py2.py3-none-any.whl", hash = "sha256:1311f10e8b895935241623731c2ba64f4c455287888b18189350b67134a822e8"},
 ]
 
+[[package]]
+name = "tinycss2"
+version = "1.2.1"
+description = "A tiny CSS parser"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tinycss2-1.2.1-py3-none-any.whl", hash = "sha256:2b80a96d41e7c3914b8cda8bc7f705a4d9c49275616e886103dd839dfc847847"},
+    {file = "tinycss2-1.2.1.tar.gz", hash = "sha256:8cff3a8f066c2ec677c06dbc7b45619804a6938478d9d73c284b29d14ecb0627"},
+]
+
+[package.dependencies]
+webencodings = ">=0.4"
+
+[package.extras]
+doc = ["sphinx", "sphinx_rtd_theme"]
+test = ["flake8", "isort", "pytest"]
+
 [[package]]
 name = "tomli"
 version = "2.0.1"
@@ -3659,6 +3840,22 @@ platformdirs = ">=2.4,<4"
 docs = ["furo (>=2022.12.7)", "proselint (>=0.13)", "sphinx (>=6.1.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=22.12)"]
 test = ["covdefaults (>=2.2.2)", "coverage (>=7.1)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23)", "pytest (>=7.2.1)", "pytest-env (>=0.8.1)", "pytest-freezegun (>=0.4.2)", "pytest-mock (>=3.10)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)"]
 
+[[package]]
+name = "wand"
+version = "0.6.11"
+description = "Ctypes-based simple MagickWand API binding for Python"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "Wand-0.6.11-py2.py3-none-any.whl", hash = "sha256:1b77e25439ace57f665d1ccc6cff2766fad0834005b89ae3e7aaf3ba12b124b0"},
+    {file = "Wand-0.6.11.tar.gz", hash = "sha256:b661700da9f8f1e931e52726e4fc643a565b9514f5883d41b773e3c37c9fa995"},
+]
+
+[package.extras]
+doc = ["Sphinx (>=5.3.0)"]
+test = ["pytest (>=7.2.0)"]
+
 [[package]]
 name = "watchdog"
 version = "2.3.1"
@@ -3743,6 +3940,18 @@ files = [
     {file = "wcwidth-0.2.6.tar.gz", hash = "sha256:a5220780a404dbe3353789870978e472cfe477761f06ee55077256e509b156d0"},
 ]
 
+[[package]]
+name = "webencodings"
+version = "0.5.1"
+description = "Character encoding aliases for legacy web content"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
+    {file = "webencodings-0.5.1.tar.gz", hash = "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"},
+]
+
 [[package]]
 name = "werkzeug"
 version = "2.2.3"
@@ -3862,7 +4071,18 @@ files = [
     {file = "wrapt-1.15.0.tar.gz", hash = "sha256:d06730c6aed78cee4126234cf2d071e01b44b915e725a6cb439a879ec9754a3a"},
 ]
 
+[[package]]
+name = "xvfbwrapper"
+version = "0.2.9"
+description = "run headless display inside X virtual framebuffer (Xvfb)"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
+    {file = "xvfbwrapper-0.2.9.tar.gz", hash = "sha256:bcf4ae571941b40254faf7a73432dfc119ad21ce688f1fdec533067037ecfc24"},
+]
+
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "f9a99f36ec97a450398a9bf31df6970377ae436a6f3e0500acf0eaf08dc4199f"
+content-hash = "8bb4acf1ceb7b54ad1864fe625ca1aa68d4cc371ce45170bede728ad84fa2c84"

pyproject.toml

@@ -72,6 +72,8 @@ django-active-link = "^0.1.8"
 channels = "^4.0.0"
 django-upload-validator = "^1.1.6"
 markdown = "^3.4.3"
+preview-generator = {extras = ["all"], version = "^0.29"}
+pydotplus = "^2.0.2"
 
 
 [build-system]