backoffice/listings: add minimal JSON export (#6642)

also move JSONEncoder to qommon.misc

wcs/backoffice/root.py

@@ -45,6 +45,8 @@ from wcs.forms.backoffice import FormDefUI
 import wcs.admin.forms
 import wcs.admin.workflows
 
+from wcs.api import get_user_from_api_query_string
+
 
 try:
     import xlwt
@@ -492,7 +494,7 @@ class FakeField(object):
         return [element]
 
 class FormPage(Directory):
-    _q_exports = ['', 'csv', 'stats', 'xls', 'ods', 'pending', 'export']
+    _q_exports = ['', 'csv', 'stats', 'xls', 'ods', 'json', 'pending', 'export']
 
     def __init__(self, component):
         try:
@@ -954,6 +956,21 @@ class FormPage(Directory):
             response.set_header('content-disposition', 'attachment; filename=%s.ods' % self.formdef.url_name)
             return exporter.output.getvalue()
 
+    def json(self):
+        get_response().set_content_type('application/json')
+        user = get_user_from_api_query_string() or get_request().user
+        selected_filter = self.get_filter_from_query()
+        query = get_request().form.get('q')
+        items, total_count = FormDefUI(self.formdef).get_listing_items(
+            selected_filter, user=user, query=query)
+        output = [{'id': filled.id,
+            'url': filled.get_url(backoffice=True),
+            'receipt_time': filled.receipt_time,
+            'last_update_time': filled.last_update_time} for filled in items]
+        return json.dumps(output,
+                cls=misc.JSONEncoder,
+                encoding=get_publisher().site_charset)
+
     def get_stats_sidebar(self):
         get_response().add_javascript(['jquery.js'])
         DateWidget.prepare_javascript()

wcs/formdata.py

@@ -91,13 +91,6 @@ def get_json_dict(fields, data):
             new_data[field.varname] = value
     return new_data
 
-class JSONEncoder(json.JSONEncoder):
-    def default(self, obj):
-        if isinstance(obj, time.struct_time):
-            return qommon.strftime.strftime('%Y-%m-%dT%H:%M:%S', obj)
-        # Let the base class default method raise the TypeError
-        return json.JSONEncoder.default(self, obj)
-
 
 class Evolution(object):
     who = None
@@ -546,7 +539,7 @@ class FormData(StorableObject):
             data['workflow']['data'] = self.workflow_data
 
         return json.dumps(data,
-                cls=JSONEncoder,
+                cls=qommon.misc.JSONEncoder,
                 encoding=get_publisher().site_charset)
 
     def feed_session(self):

wcs/qommon/misc.py

@@ -22,12 +22,14 @@ import httplib
 import urllib
 import socket
 import base64
+import json
 
 from quixote import get_publisher, get_session
 from quixote.html import htmltext
 
 from qommon import get_cfg, get_logger, ezt
 from qommon.errors import ConnectionError
+import qommon.strftime
 
 import strftime
 
@@ -502,3 +504,11 @@ def indent_xml(elem, level=0):
         if level and (not elem.tail or not elem.tail.strip()):
             elem.tail = i
     return elem
+
+
+class JSONEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, time.struct_time):
+            return qommon.strftime.strftime('%Y-%m-%dT%H:%M:%S', obj)
+        # Let the base class default method raise the TypeError
+        return json.JSONEncoder.default(self, obj)