Split sources models into separate modules

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/sources/models/watch_folder_sources.py

@@ -0,0 +1,55 @@
+from __future__ import unicode_literals
+
+import logging
+import os
+
+from django.core.files import File
+from django.db import models
+from django.utils.encoding import force_text
+from django.utils.translation import ugettext_lazy as _
+
+from ..literals import SOURCE_CHOICE_WATCH, SOURCE_UNCOMPRESS_CHOICE_Y
+
+from .base import IntervalBaseModel
+
+__all__ = ('WatchFolderSource',)
+logger = logging.getLogger(__name__)
+
+
+class WatchFolderSource(IntervalBaseModel):
+    """
+    The watch folder is another non-interactive source that like the email
+    source, works by periodically checking and processing documents. This
+    source instead of using an email account, monitors a filesystem folder.
+    Administrators can define watch folders, examples /home/mayan/watch_bills
+    or /home/mayan/watch_invoices and users just need to copy the documents
+    they want to upload as a bill or invoice to the respective filesystem
+    folder. Mayan will periodically scan these filesystem locations and
+    upload the files as documents, deleting them if configured.
+    """
+    source_type = SOURCE_CHOICE_WATCH
+
+    folder_path = models.CharField(
+        help_text=_('Server side filesystem path.'), max_length=255,
+        verbose_name=_('Folder path')
+    )
+
+    objects = models.Manager()
+
+    class Meta:
+        verbose_name = _('Watch folder')
+        verbose_name_plural = _('Watch folders')
+
+    def check_source(self):
+        # Force self.folder_path to unicode to avoid os.listdir returning
+        # str for non-latin filenames, gh-issue #163
+        for file_name in os.listdir(force_text(self.folder_path)):
+            full_path = os.path.join(self.folder_path, file_name)
+            if os.path.isfile(full_path):
+                with File(file=open(full_path, mode='rb')) as file_object:
+                    self.handle_upload(
+                        file_object=file_object,
+                        expand=(self.uncompress == SOURCE_UNCOMPRESS_CHOICE_Y),
+                        label=file_name
+                    )
+                    os.unlink(full_path)