Merge pull request #591 from paperless-ngx/feature-version-checker

Feature: Update checker

src/documents/views.py

@@ -1,6 +1,8 @@
+import json
 import logging
 import os
 import tempfile
+import urllib
 import uuid
 import zipfile
 from datetime import datetime
@@ -24,6 +26,8 @@ from django.views.decorators.cache import cache_control
 from django.views.generic import TemplateView
 from django_filters.rest_framework import DjangoFilterBackend
 from django_q.tasks import async_task
+from packaging import version as packaging_version
+from paperless import version
 from paperless.db import GnuPG
 from paperless.views import StandardPagination
 from rest_framework import parsers
@@ -666,3 +670,40 @@ class BulkDownloadView(GenericAPIView):
             )
 
             return response
+
+
+class RemoteVersionView(GenericAPIView):
+    def get(self, request, format=None):
+        remote_version = "0.0.0"
+        is_greater_than_current = False
+        # TODO: this can likely be removed when frontend settings are saved to DB
+        feature_is_set = settings.ENABLE_UPDATE_CHECK != "default"
+        if feature_is_set and settings.ENABLE_UPDATE_CHECK:
+            try:
+                with urllib.request.urlopen(
+                    "https://api.github.com/repos/"
+                    + "paperless-ngx/paperless-ngx/releases/latest",
+                ) as response:
+                    remote = response.read().decode("utf-8")
+                try:
+                    remote_json = json.loads(remote)
+                    remote_version = remote_json["tag_name"].replace("ngx-", "")
+                except ValueError:
+                    logger.debug("An error occured parsing remote version json")
+            except urllib.error.URLError:
+                logger.debug("An error occured checking for available updates")
+
+            current_version = ".".join([str(_) for _ in version.__version__[:3]])
+            is_greater_than_current = packaging_version.parse(
+                remote_version,
+            ) > packaging_version.parse(
+                current_version,
+            )
+
+        return Response(
+            {
+                "version": remote_version,
+                "update_available": is_greater_than_current,
+                "feature_is_set": feature_is_set,
+            },
+        )