The first stages of getting thumbnails back

.gitignore

@@ -57,7 +57,9 @@ docs/_build/
 target/
 
 # Stored PDFs
-media/*
+media/documents/*.gpg
+media/documents/thumbnails/*.gpg
+media/documents/originals/*.gpg
 
 # Sqlite database
 db.sqlite3
@@ -74,4 +76,3 @@ docker-compose.env
 # Used for development
 scripts/import-for-development
 environment
-

src/documents/migrations/0012_auto_20160305_0040.py

@@ -0,0 +1,101 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.2 on 2016-03-05 00:40
+from __future__ import unicode_literals
+
+import gnupg
+import os
+import re
+import shutil
+import subprocess
+import tempfile
+
+from django.conf import settings
+from django.db import migrations
+
+
+class GnuPG(object):
+    """
+    A handy singleton to use when handling encrypted files.
+    """
+
+    gpg = gnupg.GPG(gnupghome=settings.GNUPG_HOME)
+
+    @classmethod
+    def decrypted(cls, file_handle):
+        return cls.gpg.decrypt_file(
+            file_handle, passphrase=settings.PASSPHRASE).data
+
+    @classmethod
+    def encrypted(cls, file_handle):
+        return cls.gpg.encrypt_file(
+            file_handle,
+            recipients=None,
+            passphrase=settings.PASSPHRASE,
+            symmetric=True
+        ).data
+
+
+def move_documents_and_create_thumbnails(apps, schema_editor):
+
+    documents = os.listdir(os.path.join(settings.MEDIA_ROOT, "documents"))
+
+    if not documents:
+        return
+
+    print("\n")
+
+    for f in sorted(documents):
+
+        if not f.endswith("gpg"):
+            continue
+
+        print("    * Generating a thumbnail for {}".format(f))
+
+        thumb_temp = tempfile.mkdtemp(
+            prefix="paperless", dir=settings.SCRATCH_DIR)
+        orig_temp = tempfile.mkdtemp(
+            prefix="paperless", dir=settings.SCRATCH_DIR)
+
+        orig_source = os.path.join(settings.MEDIA_ROOT, "documents", f)
+        orig_target = os.path.join(orig_temp, f.replace(".gpg", ""))
+
+        with open(orig_source, "rb") as encrypted:
+            with open(orig_target, "wb") as unencrypted:
+                unencrypted.write(GnuPG.decrypted(encrypted))
+
+        subprocess.Popen((
+            settings.CONVERT_BINARY,
+            "-scale", "500x500",
+            orig_target,
+            os.path.join(thumb_temp, "convert-%04d.jpg")
+        )).wait()
+
+        thumb_source = os.path.join(thumb_temp, "convert-0000.jpg")
+        thumb_target = os.path.join(
+            settings.MEDIA_ROOT,
+            "documents",
+            "thumbnails",
+            re.sub(r"(\d+)\.\w+(\.gpg)", "\\1.jpg\\2", f)
+        )
+        with open(thumb_source, "rb") as unencrypted:
+            with open(thumb_target, "wb") as encrypted:
+                encrypted.write(GnuPG.encrypted(unencrypted))
+
+        shutil.rmtree(thumb_temp)
+        shutil.rmtree(orig_temp)
+
+        shutil.move(
+            os.path.join(settings.MEDIA_ROOT, "documents", f),
+            os.path.join(settings.MEDIA_ROOT, "documents", "originals", f),
+        )
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('documents', '0011_auto_20160303_1929'),
+    ]
+
+    operations = [
+        migrations.RunPython(move_documents_and_create_thumbnails),
+    ]

src/documents/models.py

@@ -171,6 +171,7 @@ def source_path(self):
         return os.path.join(
             settings.MEDIA_ROOT,
             "documents",
+            "originals",
             "{:07}.{}.gpg".format(self.pk, self.file_type)
         )
 
@@ -184,7 +185,24 @@ def file_name(self):
 
     @property
     def download_url(self):
-        return reverse("fetch", kwargs={"pk": self.pk})
+        return reverse("fetch", kwargs={"kind": "doc", "pk": self.pk})
+
+    @property
+    def thumbnail_path(self):
+        return os.path.join(
+            settings.MEDIA_ROOT,
+            "documents",
+            "thumbnails",
+            "{:07}.jpg.gpg".format(self.pk)
+        )
+
+    @property
+    def thumbnail_file(self):
+        return open(self.thumbnail_path, "rb")
+
+    @property
+    def thumbnail_url(self):
+        return reverse("fetch", kwargs={"kind": "thumb", "pk": self.pk})
 
 
 class Log(models.Model):

src/documents/views.py

@@ -35,7 +35,7 @@ class FetchView(LoginRequiredMixin, DetailView):
 
     def render_to_response(self, context, **response_kwargs):
         """
-        Override the default to return the unencrypted PDF as raw data.
+        Override the default to return the unencrypted image/PDF as raw data.
         """
 
         content_types = {
@@ -46,6 +46,12 @@ def render_to_response(self, context, **response_kwargs):
             Document.TYPE_TIF: "image/tiff",
         }
 
+        if self.kwargs["kind"] == "thumb":
+            return HttpResponse(
+                GnuPG.decrypted(self.object.thumb_file),
+                content_type=content_types[Document.TYPE_JPG]
+            )
+
         response = HttpResponse(
             GnuPG.decrypted(self.object.source_file),
             content_type=content_types[self.object.file_type]

src/paperless/urls.py

@@ -44,7 +44,11 @@
     # url(r"^$", IndexView.as_view(), name="index"),
 
     # File downloads
-    url(r"^fetch/(?P<pk>\d+)$", FetchView.as_view(), name="fetch"),
+    url(
+        r"^fetch/(?P<kind>doc|thumb)/(?P<pk>\d+)$",
+        FetchView.as_view(),
+        name="fetch"
+    ),
 
     # The Django admin
     url(r"admin/", admin.site.urls),