Added support for the server side file manager, which will be useful in

selection, creation, upload/download files/directories resides on the
server side.

This will be useful for file selection/creation for different server
side utilites like pg_dump, pg_dumpall, pg_restore.

web/pgadmin/utils/paths.py

@@ -0,0 +1,68 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2016, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+#########################################################################
+
+"""This file contains functions fetching different utility paths."""
+
+import os
+from flask.ext.security import current_user, login_required
+import config
+
+
+@login_required
+def get_storage_directory():
+
+    if config.SERVER_MODE is not True:
+        return None
+
+    storage_dir = getattr(
+        config, 'STORAGE_DIR',
+        os.path.join(
+            os.path.realpath(
+                os.path.expanduser('~/.pgadmin/')
+            ), 'storage'
+        )
+    )
+    username = current_user.email.split('@')[0]
+    if len(username) == 0 or username[0].isdigit():
+        username = 'pga_user_' + username
+
+    storage_dir = os.path.join(storage_dir, username)
+    print(storage_dir)
+
+    if not os.path.exists(storage_dir):
+        os.makedirs(storage_dir, int('700', 8))
+
+    return storage_dir
+
+
+def init_app(app):
+
+    if config.SERVER_MODE is not True:
+        return None
+
+    storage_dir = getattr(
+        config, 'STORAGE_DIR',
+        os.path.join(
+            os.path.realpath(
+                os.path.expanduser('~/.pgadmin/')
+            ), 'storage'
+        )
+    )
+
+    if not os.path.isdir(storage_dir):
+        if os.path.exists(storage_dir):
+            raise Exception(
+                'The value specified for as the storage directory is not a directory!'
+            )
+        os.makedirs(storage_dir, int('700', 8))
+
+    if not os.access(storage_dir, os.W_OK | os.R_OK):
+        raise Exception(
+            'The user does not have permission to read, write on the specified storage directory!'
+        )