Supply url_fetcher to weasyprint to support /media and /static files

.pre-commit-config.yaml

@@ -17,7 +17,7 @@ repos:
     -   id: check-yaml
     -   id: mixed-line-ending
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.11.0
+    rev: v0.11.2
     hooks:
     - id: ruff-format
       args: [--preview]
@@ -28,7 +28,7 @@ repos:
         --preview
       ]
 -   repo: https://github.com/astral-sh/uv-pre-commit
-    rev: 0.6.6
+    rev: 0.6.10
     hooks:
       - id: pip-compile
         name: pip-compile requirements-dev.in
@@ -70,13 +70,13 @@ repos:
           src/frontend/vite.config.ts |
       )$
 -   repo: https://github.com/biomejs/pre-commit
-    rev: v1.9.4
+    rev: v2.0.0-beta.1
     hooks:
     -   id: biome-check
         additional_dependencies: ["@biomejs/biome@1.9.4"]
         files: ^src/frontend/.*\.(js|ts|tsx)$
 -   repo: https://github.com/gitleaks/gitleaks
-    rev: v8.24.0
+    rev: v8.24.2
     hooks:
     -   id: gitleaks
         language_version: 1.23.6

src/backend/InvenTree/report/models.py

@@ -3,6 +3,7 @@
 import io
 import os
 import sys
+from urllib.parse import unquote, urlparse
 
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -26,13 +27,14 @@
 import report.validators
 from common.models import DataOutput
 from common.settings import get_global_setting
+from InvenTree import config
 from InvenTree.helpers_model import get_base_url
 from InvenTree.models import MetadataMixin
 from plugin import InvenTreePlugin, PluginMixinEnum
 from plugin.registry import registry
 
 try:
-    from weasyprint import HTML
+    from weasyprint import HTML, default_url_fetcher
 except OSError as err:  # pragma: no cover
     print(f'OSError: {err}')
     print("Unable to import 'weasyprint' module.")
@@ -42,6 +44,31 @@
 
 logger = structlog.getLogger('inventree')
 
+WE_BASE_URL = 'http://localhost'
+
+
+def url_fetcher(url: str, timeout=10, ssl_context=None):
+    """Function to fetch files for Weasyprint.
+
+    Will resolve `/media` and `/static` requests to `MEDIA_ROOT` and `STATIC_ROOT` respectively.
+
+    All other requests will fall back to `weasyprint.default_url_fetcher`.
+    """
+    media = config.get_media_dir().resolve()
+    static = config.get_static_dir().resolve()
+    if url.startswith(WE_BASE_URL):
+        # .path always starts with a '/' character, which must be trimmed off.
+        u = unquote(urlparse(url).path)[1:]
+        if u.startswith('/media'):
+            pth = media.parent.joinpath(u).resolve()
+            if media in pth.parents:
+                return {'file_obj': open(pth, 'rb')}
+        elif u.startswith('/static'):
+            pth = static.parent.joinpath(u).resolve()
+            if static in pth.parents:
+                return {'file_obj': open(pth, 'rb')}
+    return default_url_fetcher(url, timeout=timeout, ssl_context=ssl_context)
+
 
 def rename_template(instance, filename):
     """Function to rename a report template once uploaded.
@@ -198,7 +225,9 @@ def render(self, instance, request=None, **kwargs) -> bytes:
             bytes: PDF data
         """
         html = self.render_as_string(instance, request, **kwargs)
-        pdf = HTML(string=html).write_pdf()
+        pdf = HTML(
+            string=html, url_fetcher=url_fetcher, base_url=WE_BASE_URL
+        ).write_pdf()
 
         return pdf