Enable ephemeral message responses by Onyx Slack Bots (#4142)

A new setting 'is_ephemeral' has been added to the Slack channel configurations. 

Key features/effects:

  - if is_ephemeral is set for standard channel (and a Search Assistant is chosen):
     - the answer is only shown to user as an ephemeral message
     - the user has access to his private documents for a search (as the answer is only shown to them) 
     - the user has the ability to share the answer with the channel or keep private
     - a recipient list cannot be defined if the channel is set up as ephemeral
 
  - if is_ephemeral is set and DM with bot:
    - the user has access to private docs in searches
    - the message is not sent as ephemeral, as it is a 1:1 discussion with bot

 - if is_ephemeral is not set but recipient list is set:
    - the user search does *not* have access to their private documents as the information goes to the recipient list team members, and they may have different access rights

 - Overall:
     - Unless the channel is set to is_ephemeral or it is a direct conversation with the Bot, only public docs are accessible  
     - The ACL is never bypassed, also not in cases where the admin explicitly attached a document set to the bot config.

web/src/app/admin/bots/[bot-id]/channels/SlackChannelConfigCreationForm.tsx

@@ -83,6 +83,8 @@ export const SlackChannelConfigCreationForm = ({
           respond_tag_only:
             existingSlackChannelConfig?.channel_config?.respond_tag_only ||
             false,
+          is_ephemeral:
+            existingSlackChannelConfig?.channel_config?.is_ephemeral || false,
           respond_to_bots:
             existingSlackChannelConfig?.channel_config?.respond_to_bots ||
             false,
@@ -135,6 +137,7 @@ export const SlackChannelConfigCreationForm = ({
           questionmark_prefilter_enabled: Yup.boolean().required(),
           respond_tag_only: Yup.boolean().required(),
           respond_to_bots: Yup.boolean().required(),
+          is_ephemeral: Yup.boolean().required(),
           show_continue_in_web_ui: Yup.boolean().required(),
           enable_auto_filters: Yup.boolean().required(),
           respond_member_group_list: Yup.array().of(Yup.string()).required(),

web/src/app/admin/bots/[bot-id]/channels/SlackChannelConfigFormFields.tsx

@@ -597,6 +597,13 @@ export function SlackChannelConfigFormFields({
                 label="Respond to Bot messages"
                 tooltip="If not set, OnyxBot will always ignore messages from Bots"
               />
+              <CheckFormField
+                name="is_ephemeral"
+                label="Respond to user in a private (ephemeral) message"
+                tooltip="If set, OnyxBot will respond only to the user in a private (ephemeral) message. If you also 
+                chose 'Search' Assistant above, selecting this option will make documents that are private to the user 
+                available for their queries."
+              />
 
               <TextArrayField
                 name="respond_member_group_list"
@@ -635,11 +642,14 @@ export function SlackChannelConfigFormFields({
                   Privacy Alert
                 </Label>
                 <p className="text-sm text-text-darker mb-4">
-                  Please note that at least one of the documents accessible by
-                  your OnyxBot is marked as private and may contain sensitive
-                  information. These documents will be accessible to all users
-                  of this OnyxBot. Ensure this aligns with your intended
-                  document sharing policy.
+                  Please note that if the private (ephemeral) response is *not
+                  selected*, only public documents within the selected document
+                  sets will be accessible for user queries. If the private
+                  (ephemeral) response *is selected*, user quries can also
+                  leverage documents that the user has already been granted
+                  access to. Note that users will be able to share the response
+                  with others in the channel, so please ensure that this is
+                  aligned with your company sharing policies.
                 </p>
                 <div className="space-y-2">
                   <h4 className="text-sm text-text font-medium">

web/src/app/admin/bots/[bot-id]/lib.ts

@@ -14,6 +14,7 @@ interface SlackChannelConfigCreationRequest {
   answer_validity_check_enabled: boolean;
   questionmark_prefilter_enabled: boolean;
   respond_tag_only: boolean;
+  is_ephemeral: boolean;
   respond_to_bots: boolean;
   show_continue_in_web_ui: boolean;
   respond_member_group_list: string[];
@@ -45,6 +46,7 @@ const buildRequestBodyFromCreationRequest = (
     channel_name: creationRequest.channel_name,
     respond_tag_only: creationRequest.respond_tag_only,
     respond_to_bots: creationRequest.respond_to_bots,
+    is_ephemeral: creationRequest.is_ephemeral,
     show_continue_in_web_ui: creationRequest.show_continue_in_web_ui,
     enable_auto_filters: creationRequest.enable_auto_filters,
     respond_member_group_list: creationRequest.respond_member_group_list,

web/src/lib/types.ts

@@ -273,6 +273,7 @@ export interface ChannelConfig {
   channel_name: string;
   respond_tag_only?: boolean;
   respond_to_bots?: boolean;
+  is_ephemeral?: boolean;
   show_continue_in_web_ui?: boolean;
   respond_member_group_list?: string[];
   answer_filters?: AnswerFilterOption[];