--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Resources/OrthancWSIClearCache.py	Mon Nov 28 16:51:19 2016 +0100
@@ -0,0 +1,77 @@
+#!/usr/bin/python
+
+# Orthanc - A Lightweight, RESTful DICOM Store
+# Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+# Department, University Hospital of Liege, Belgium
+#
+# This program is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Affero General Public License
+# as published by the Free Software Foundation, either version 3 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Affero General Public License for more details.
+# 
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+import base64
+import httplib2
+import json
+import os
+import sys
+
+if len(sys.argv) != 3 and len(sys.argv) != 5:
+    print("""
+Script to reinitialize the cache of the whole-slide imaging plugin for
+Orthanc. Please make sure that Orthanc is running before starting this
+script.
+
+Usage: %s [hostname] [HTTP port]
+Usage: %s [hostname] [HTTP port] [username] [password]
+For instance: %s 127.0.0.1 8042
+""" % (sys.argv[0], sys.argv[0], sys.argv[0]))
+    exit(-1)
+
+
+METADATA=4200
+
+
+def RunHttpRequest(uri, method, body = None):
+    http = httplib2.Http()
+    headers = { }
+
+    if len(sys.argv) == 5:
+        username = sys.argv[4]
+        password = sys.argv[5]
+
+        # h.add_credentials(username, password)
+
+        # This is a custom reimplementation of the
+        # "Http.add_credentials()" method for Basic HTTP Access
+        # Authentication (for some weird reason, this method does not
+        # always work)
+        # http://en.wikipedia.org/wiki/Basic_access_authentication
+        headers['authorization'] = 'Basic ' + base64.b64encode(username + ':' + password)       
+
+    url = 'http://%s:%d/%s' % (sys.argv[1], int(sys.argv[2]), uri)
+    resp, content = http.request(url, method,
+                                 body = body,
+                                 headers = headers)
+
+    if resp.status != 200:
+        raise Exception('Cannot %s on URL %s, HTTP status %d '
+                        '(Is Orthanc running? Is there a password?)' % 
+                        (method, url, resp.status))
+    else:
+        return content.decode('utf8')
+
+
+for instance in json.loads(RunHttpRequest('/instances', 'GET')):
+    print('Clearing cache for instance %s' % instance)
+    RunHttpRequest('/instances/%s/metadata/%s' % (instance, METADATA), 'DELETE')
+
+print('The WSI cache was successfully cleared')