From 8c4f1318e070eae0dafc35db03b0de7571063c24 Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@iggdrasil.net>
Date: Wed, 9 Feb 2022 11:55:10 +0100
Subject: File storage: fix file save on broken link

---
 ishtar_common/tests.py | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 ishtar_common/utils.py | 10 ++++++++++
 2 files changed, 58 insertions(+)

(limited to 'ishtar_common')

diff --git a/ishtar_common/tests.py b/ishtar_common/tests.py
index e535eda4b..90af3ac93 100644
--- a/ishtar_common/tests.py
+++ b/ishtar_common/tests.py
@@ -2913,6 +2913,54 @@ class PersonQATest(TestCase):
         )
 
 
+class StorageTest(TestCase):
+    def setUp(self) -> None:
+        self.st1 = models.SourceType.objects.create(label="Report", code="REP")
+
+    def test_filesystemstorage(self) -> None:
+        # bug when link to non-existing files
+        image_path = os.path.join(
+            settings.ROOT_PATH, "..", "ishtar_common", "tests", "test.png"
+        )
+        doc = models.Document.objects.create(
+            source_type=self.st1,
+            title="Operation report",
+            image=SimpleUploadedFile(
+                name="test.png",
+                content=open(image_path, "rb").read(),
+                content_type="image/png",
+            ),
+        )
+        p = doc.image.path.split(os.sep)
+        # current save path
+        base_path = os.sep.join(p[:-1])
+        # clean all files in order to have no random string on save
+        for f in os.listdir(base_path):
+            if f.startswith("test"):
+                os.remove(os.path.join(base_path, f))
+        doc = models.Document.objects.get(pk=doc.pk)
+        doc.image.save(
+            "test.png",
+            SimpleUploadedFile(
+                name="test.png",
+                content=open(image_path, "rb").read(),
+                content_type="image/png",
+            ),
+        )
+        doc = models.Document.objects.get(pk=doc.pk)
+        os.remove(doc.image.path)
+        os.symlink("/tmp/ZZZZZZZZZZZZZZZ", doc.image.path)  # bad link
+        doc.image.save(
+            "test.png",
+            SimpleUploadedFile(
+                name="test.png",
+                content=open(image_path, "rb").read(),
+                content_type="image/png",
+            ),
+        )
+        doc.save()
+
+
 class DocumentTest(TestCase):
     def setUp(self):
         Operation = apps.get_model("archaeological_operations", "Operation")
diff --git a/ishtar_common/utils.py b/ishtar_common/utils.py
index e27b26e70..9b2f38819 100644
--- a/ishtar_common/utils.py
+++ b/ishtar_common/utils.py
@@ -52,6 +52,7 @@ from django.contrib.sessions.backends.db import SessionStore
 from django.core.cache import cache
 from django.core.exceptions import SuspiciousOperation, ObjectDoesNotExist
 from django.core.files import File
+from django.core.files.storage import FileSystemStorage
 from django.core.validators import EMPTY_VALUES
 from django.core.urlresolvers import reverse
 from django.db import models
@@ -2072,3 +2073,12 @@ def get_image_path(instance, filename):
         n = datetime.datetime.now()
         return "upload/{}/{:02d}/{:02d}/{}".format(n.year, n.month, n.day, filename)
     return instance._get_image_path(filename)
+
+
+class IshtarFileSystemStorage(FileSystemStorage):
+    def exists(self, name):
+        path_name = self.path(name)
+        if os.path.islink(path_name):
+            if not os.path.exists(os.readlink(path_name)):
+                os.remove(path_name)
+        return os.path.exists(path_name)
-- 
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