form: make it possible to specify the expected file type (#5732)

wcs/fields.py

@@ -619,8 +619,22 @@ register_field_class(BoolField)
 class FileField(WidgetField):
     key = 'file'
     description = N_('File Upload')
+    file_type = []
 
     widget_class = FileWithPreviewWidget
+    extra_attributes = ['file_type']
+
+    def fill_admin_form(self, form):
+        WidgetField.fill_admin_form(self, form)
+        file_types = [
+                ('audio/*', _('Sound files')),
+                ('video/*', _('Video files')),
+                ('image/*', _('Image files'))]
+        form.add(CheckboxesWidget, 'file_type', title=_('File type suggestion'),
+                value=self.file_type, elements=file_types, inline=True)
+
+    def get_admin_attributes(self):
+        return WidgetField.get_admin_attributes(self) + ['file_type']
 
     def get_view_value(self, value):
         return htmltext('<a download="%s" href="[download]?f=%s">%s</a>') % (

wcs/qommon/form.py

@@ -486,6 +486,7 @@ class FileWithPreviewWidget(CompositeWidget):
     ondisk so it has a "readonly" mode where the filename is shown."""
 
     extra_css_class = 'file-upload-widget'
+    file_type = None
 
     def __init__(self, name, value=None, **kwargs):
         CompositeWidget.__init__(self, name, value, **kwargs)
@@ -493,8 +494,11 @@ class FileWithPreviewWidget(CompositeWidget):
         self.preview = kwargs.get('readonly')
         self.add(HiddenWidget, 'token')
         if not self.preview:
-            self.add(FileWidget, 'file', render_br=False,
-                     attrs={'data-url': get_publisher().get_root_url() + 'tmp-upload'})
+            attrs = {'data-url': get_publisher().get_root_url() + 'tmp-upload'}
+            self.file_type = kwargs.pop('file_type', None)
+            if self.file_type:
+                attrs['accept'] = ','.join(self.file_type)
+            self.add(FileWidget, 'file', render_br=False, attrs=attrs)
         if value:
             self.set_value(value)