[Security Assistant] Adds client hooks and internal routes for managi…

…ng Knowledge Base Entries (elastic#184974)

## Summary

This PR adds client hooks and basic REST API's for accessing and
mutating Knowledge Base Entries. This is in support of @angorayc
building out the new Knowledge Base settings interface.

Change set includes:
- [X] Refactors existing KB client hooks from
`x-pack/packages/kbn-elastic-assistant/impl/knowledge_base` to be
co-located next to the API methods where we put all our other hooks:
`x-pack/packages/kbn-elastic-assistant/impl/assistant/api/knowledge_base`
- [X] Refactors existing KB API calls and associated tests out of
`kbn-elastic-assistant/impl/assistant/api/index.tsx` and into
`x-pack/packages/kbn-elastic-assistant/impl/assistant/api/knowledge_base/api.tsx`
- [X] Adds new `find_knowledge_base_entries_route.schema.yaml` OAS for
the supporting
`/internal/elastic_assistant/knowledge_base/entries/_find` route
- [X] Refactors `SortOrder` out of existing OAS's into the shared
`schemas/common_attributes.schema.yaml`

### Client Hooks & Routes
Adds new `useKnowledgeBaseEntries()` hook and corresponding
`/knowledge_base/entries/_find` route for returning paginated KB Entries
to populate the KB table in settings. E.g.

``` ts
    const {
      assistantFeatures: { assistantKnowledgeBaseByDefault: enableKnowledgeBaseByDefault },
      http,
      toasts,
    } = useAssistantContext();
    const { data: kbEntries, isLoading: isLoadingEntries } = useKnowledgeBaseEntries({ http });
```


###### Sample Response
``` json
{
  "perPage": 20,
  "page": 1,
  "total": 145,
  "data": [
    {
      "timestamp": "2024-06-05T21:19:56.482Z",
      "id": "CtBF6o8BSQy1Bdxt2FHz",
      "createdAt": "2024-06-05T21:19:56.482Z",
      "createdBy": "u_mGBROF_q5bmFCATbLXAcCwKa0k8JvONAwSruelyKA5E_0",
      "updatedAt": "2024-06-05T21:19:56.482Z",
      "updatedBy": "u_mGBROF_q5bmFCATbLXAcCwKa0k8JvONAwSruelyKA5E_0",
      "users": [
        {
          "id": "u_mGBROF_q5bmFCATbLXAcCwKa0k8JvONAwSruelyKA5E_0",
          "name": "elastic"
        }
      ],
      "metadata": {
        "kbResource": "security_labs",
        "source": "/Users/garrettspong/dev/kibana-main/x-pack/plugins/elastic_assistant/server/knowledge_base/security_labs/2022_elastic_global_threat_report_announcement.mdx",
        "required": false
      },
      "namespace": "default",
      "text": "[Source Content Here]",
      "vector": {
        "modelId": ".elser_model_2",
        "tokens": {
          "2": 0.06595266,
          ...
        }
      }
    },
    ...
  ]
}
```

Response is the full newly created `entry`. Same format for the entry as
above in the `_find` API, and the `KnowledgeBaseEntries` cache is
invalidated.


Adds new `useCreateKnowledgeBaseEntry()` hook and corresponding
`/knowledge_base/entries` route for creating new KB Entries

``` ts
    const entry: KnowledgeBaseEntryCreateProps = {
      metadata: {
        kbResource: 'user',
        required: true,
        source: 'user',
      },
      text: 'Useful information about the user',
    };
    const { mutate: createEntry, isLoading: isCreatingEntry } = useCreateKnowledgeBaseEntry({
      http,
    });
    await createEntry(entry);
```

Adds new `useDeleteKnowledgeBaseEntries()` hook and corresponding
`/knowledge_base/entries/_bulk_action` route for deleting existing KB
Entries. I left a TODO to plumb through `delete_by_query` so we can add
a filter bar to the table. Need to confirm if we can do pagination with
similarity search as well.

``` ts
    const { mutate: deleteEntries, isLoading: isDeletingEntries } = useDeleteKnowledgeBaseEntries({
      http,
    });
    await deleteEntries({ ids: ['YOE_CZABSQy1BdxtAGbs'] })
```

See `KnowledgeBaseEntryBulkCrudActionResponse` for response formats.
`KnowledgeBaseEntries` cache is invalidated upon delete.


### Checklist

Delete any items that are not applicable to this PR.

- [ ] ~Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)~
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
* Feature currently behind feature flag. Documentation to be added
before flag is removed. Tracked in
elastic/security-docs#5337
- [X] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] API tests will need to be rounded out as we finalize functionality
behind the feature flag

---------

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/packages/kbn-elastic-assistant-common/constants.ts

@@ -27,5 +27,6 @@ export const ELASTIC_AI_ASSISTANT_ANONYMIZATION_FIELDS_URL_FIND = `${ELASTIC_AI_
 
 // TODO: Update existing 'status' endpoint to take resource as query param as to not conflict with 'entries'
 export const ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_URL = `${ELASTIC_AI_ASSISTANT_INTERNAL_URL}/knowledge_base/{resource?}`;
-export const ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL = `${ELASTIC_AI_ASSISTANT_URL}/knowledge_base/entries`;
-export const ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL_BULK_ACTION = `${ELASTIC_AI_ASSISTANT_URL}/knowledge_base/_bulk_action`;
+export const ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL = `${ELASTIC_AI_ASSISTANT_INTERNAL_URL}/knowledge_base/entries`;
+export const ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL_FIND = `${ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL}/_find`;
+export const ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL_BULK_ACTION = `${ELASTIC_AI_ASSISTANT_KNOWLEDGE_BASE_ENTRIES_URL}/_bulk_action`;

x-pack/packages/kbn-elastic-assistant-common/impl/capabilities/index.ts

@@ -10,6 +10,11 @@
  */
 export type AssistantFeatures = { [K in keyof typeof defaultAssistantFeatures]: boolean };
 
+/**
+ * Type for keys of the assistant features
+ */
+export type AssistantFeatureKey = keyof AssistantFeatures;
+
 /**
  * Default features available to the elastic assistant
  */

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/anonymization_fields/find_anonymization_fields_route.gen.ts

@@ -17,6 +17,7 @@
 import { z } from 'zod';
 import { ArrayFromString } from '@kbn/zod-helpers';
 
+import { SortOrder } from '../common_attributes.gen';
 import { AnonymizationFieldResponse } from './bulk_crud_anonymization_fields_route.gen';
 
 export type FindAnonymizationFieldsSortField = z.infer<typeof FindAnonymizationFieldsSortField>;
@@ -30,11 +31,6 @@ export const FindAnonymizationFieldsSortField = z.enum([
 export type FindAnonymizationFieldsSortFieldEnum = typeof FindAnonymizationFieldsSortField.enum;
 export const FindAnonymizationFieldsSortFieldEnum = FindAnonymizationFieldsSortField.enum;
 
-export type SortOrder = z.infer<typeof SortOrder>;
-export const SortOrder = z.enum(['asc', 'desc']);
-export type SortOrderEnum = typeof SortOrder.enum;
-export const SortOrderEnum = SortOrder.enum;
-
 export type FindAnonymizationFieldsRequestQuery = z.infer<
   typeof FindAnonymizationFieldsRequestQuery
 >;

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/anonymization_fields/find_anonymization_fields_route.schema.yaml

@@ -36,7 +36,7 @@ paths:
           description: Sort order
           required: false
           schema:
-            $ref: '#/components/schemas/SortOrder'
+            $ref: '../common_attributes.schema.yaml#/components/schemas/SortOrder'
         - name: 'page'
           in: query
           description: Page number
@@ -101,9 +101,3 @@ components:
         - 'allowed'
         - 'field'
         - 'updated_at'
-
-    SortOrder:
-      type: string
-      enum:
-        - 'asc'
-        - 'desc'

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/common_attributes.gen.ts

@@ -45,3 +45,8 @@ export const User = z.object({
    */
   name: z.string().optional(),
 });
+
+export type SortOrder = z.infer<typeof SortOrder>;
+export const SortOrder = z.enum(['asc', 'desc']);
+export type SortOrderEnum = typeof SortOrder.enum;
+export const SortOrderEnum = SortOrder.enum;

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/common_attributes.schema.yaml

@@ -28,3 +28,9 @@ components:
           type: string
           description: User name
 
+    SortOrder:
+      type: string
+      enum:
+        - 'asc'
+        - 'desc'
+

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/conversations/find_conversations_route.gen.ts

@@ -17,6 +17,7 @@
 import { z } from 'zod';
 import { ArrayFromString } from '@kbn/zod-helpers';
 
+import { SortOrder } from '../common_attributes.gen';
 import { ConversationResponse } from './common_attributes.gen';
 
 export type FindConversationsSortField = z.infer<typeof FindConversationsSortField>;
@@ -29,11 +30,6 @@ export const FindConversationsSortField = z.enum([
 export type FindConversationsSortFieldEnum = typeof FindConversationsSortField.enum;
 export const FindConversationsSortFieldEnum = FindConversationsSortField.enum;
 
-export type SortOrder = z.infer<typeof SortOrder>;
-export const SortOrder = z.enum(['asc', 'desc']);
-export type SortOrderEnum = typeof SortOrder.enum;
-export const SortOrderEnum = SortOrder.enum;
-
 export type FindConversationsRequestQuery = z.infer<typeof FindConversationsRequestQuery>;
 export const FindConversationsRequestQuery = z.object({
   fields: ArrayFromString(z.string()).optional(),

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/conversations/find_conversations_route.schema.yaml

@@ -36,7 +36,7 @@ paths:
           description: Sort order
           required: false
           schema:
-            $ref: '#/components/schemas/SortOrder'
+            $ref: '../common_attributes.schema.yaml#/components/schemas/SortOrder'
         - name: 'page'
           in: query
           description: Page number
@@ -124,7 +124,7 @@ paths:
           description: Sort order
           required: false
           schema:
-            $ref: '#/components/schemas/SortOrder'
+            $ref: '../common_attributes.schema.yaml#/components/schemas/SortOrder'
         - name: 'page'
           in: query
           description: Page number
@@ -188,9 +188,3 @@ components:
         - 'is_default'
         - 'title'
         - 'updated_at'
-
-    SortOrder:
-      type: string
-      enum:
-        - 'asc'
-        - 'desc'

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/index.ts

@@ -45,3 +45,4 @@ export * from './knowledge_base/crud_kb_route.gen';
 export * from './knowledge_base/bulk_crud_knowledge_base_route.gen';
 export * from './knowledge_base/common_attributes.gen';
 export * from './knowledge_base/crud_knowledge_base_route.gen';
+export * from './knowledge_base/find_knowledge_base_entries_route.gen';

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/knowledge_base/common_attributes.schema.yaml

@@ -121,4 +121,3 @@ components:
           type: string
           description: Knowledge Base Entry content
 
-

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/knowledge_base/find_knowledge_base_entries_route.gen.ts

@@ -0,0 +1,69 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+/*
+ * NOTICE: Do not edit this file manually.
+ * This file is automatically generated by the OpenAPI Generator, @kbn/openapi-generator.
+ *
+ * info:
+ *   title: Find Knowledge Base Entries API endpoint
+ *   version: 1
+ */
+
+import { z } from 'zod';
+import { ArrayFromString } from '@kbn/zod-helpers';
+
+import { SortOrder } from '../common_attributes.gen';
+import { KnowledgeBaseEntryResponse } from './common_attributes.gen';
+
+export type FindKnowledgeBaseEntriesSortField = z.infer<typeof FindKnowledgeBaseEntriesSortField>;
+export const FindKnowledgeBaseEntriesSortField = z.enum([
+  'created_at',
+  'is_default',
+  'title',
+  'updated_at',
+]);
+export type FindKnowledgeBaseEntriesSortFieldEnum = typeof FindKnowledgeBaseEntriesSortField.enum;
+export const FindKnowledgeBaseEntriesSortFieldEnum = FindKnowledgeBaseEntriesSortField.enum;
+
+export type FindKnowledgeBaseEntriesRequestQuery = z.infer<
+  typeof FindKnowledgeBaseEntriesRequestQuery
+>;
+export const FindKnowledgeBaseEntriesRequestQuery = z.object({
+  fields: ArrayFromString(z.string()).optional(),
+  /**
+   * Search query
+   */
+  filter: z.string().optional(),
+  /**
+   * Field to sort by
+   */
+  sort_field: FindKnowledgeBaseEntriesSortField.optional(),
+  /**
+   * Sort order
+   */
+  sort_order: SortOrder.optional(),
+  /**
+   * Page number
+   */
+  page: z.coerce.number().int().min(1).optional().default(1),
+  /**
+   * Knowledge Base Entries per page
+   */
+  per_page: z.coerce.number().int().min(0).optional().default(20),
+});
+export type FindKnowledgeBaseEntriesRequestQueryInput = z.input<
+  typeof FindKnowledgeBaseEntriesRequestQuery
+>;
+
+export type FindKnowledgeBaseEntriesResponse = z.infer<typeof FindKnowledgeBaseEntriesResponse>;
+export const FindKnowledgeBaseEntriesResponse = z.object({
+  page: z.number().int(),
+  perPage: z.number().int(),
+  total: z.number().int(),
+  data: z.array(KnowledgeBaseEntryResponse),
+});

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/knowledge_base/find_knowledge_base_entries_route.schema.yaml

@@ -0,0 +1,102 @@
+openapi: 3.0.0
+info:
+  title: Find Knowledge Base Entries API endpoint
+  version: '1'
+paths:
+  /internal/elastic_assistant/knowledge_base/entries/_find:
+    get:
+      operationId: FindKnowledgeBaseEntries
+      x-codegen-enabled: true
+      description: Finds Knowledge Base Entries that match the given query.
+      summary: Finds Knowledge Base Entries that match the given query.
+      tags:
+        - Knowledge Base Entries API
+      parameters:
+        - name: 'fields'
+          in: query
+          required: false
+          schema:
+            type: array
+            items:
+              type: string
+        - name: 'filter'
+          in: query
+          description: Search query
+          required: false
+          schema:
+            type: string
+        - name: 'sort_field'
+          in: query
+          description: Field to sort by
+          required: false
+          schema:
+            $ref: '#/components/schemas/FindKnowledgeBaseEntriesSortField'
+        - name: 'sort_order'
+          in: query
+          description: Sort order
+          required: false
+          schema:
+            $ref: '../common_attributes.schema.yaml#/components/schemas/SortOrder'
+        - name: 'page'
+          in: query
+          description: Page number
+          required: false
+          schema:
+            type: integer
+            minimum: 1
+            default: 1
+        - name: 'per_page'
+          in: query
+          description: Knowledge Base Entries per page
+          required: false
+          schema:
+            type: integer
+            minimum: 0
+            default: 20
+
+      responses:
+        200:
+          description: Successful response
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  page:
+                    type: integer
+                  perPage:
+                    type: integer
+                  total:
+                    type: integer
+                  data:
+                    type: array
+                    items:
+                      $ref: './common_attributes.schema.yaml#/components/schemas/KnowledgeBaseEntryResponse'
+                required:
+                  - page
+                  - perPage
+                  - total
+                  - data
+        400:
+          description: Generic Error
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  statusCode:
+                    type: number
+                  error:
+                    type: string
+                  message:
+                    type: string
+
+components:
+  schemas:
+    FindKnowledgeBaseEntriesSortField:
+      type: string
+      enum:
+        - 'created_at'
+        - 'is_default'
+        - 'title'
+        - 'updated_at'

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/prompts/find_prompts_route.gen.ts

@@ -17,18 +17,14 @@
 import { z } from 'zod';
 import { ArrayFromString } from '@kbn/zod-helpers';
 
+import { SortOrder } from '../common_attributes.gen';
 import { PromptResponse } from './bulk_crud_prompts_route.gen';
 
 export type FindPromptsSortField = z.infer<typeof FindPromptsSortField>;
 export const FindPromptsSortField = z.enum(['created_at', 'is_default', 'name', 'updated_at']);
 export type FindPromptsSortFieldEnum = typeof FindPromptsSortField.enum;
 export const FindPromptsSortFieldEnum = FindPromptsSortField.enum;
 
-export type SortOrder = z.infer<typeof SortOrder>;
-export const SortOrder = z.enum(['asc', 'desc']);
-export type SortOrderEnum = typeof SortOrder.enum;
-export const SortOrderEnum = SortOrder.enum;
-
 export type FindPromptsRequestQuery = z.infer<typeof FindPromptsRequestQuery>;
 export const FindPromptsRequestQuery = z.object({
   fields: ArrayFromString(z.string()).optional(),

x-pack/packages/kbn-elastic-assistant-common/impl/schemas/prompts/find_prompts_route.schema.yaml

@@ -36,7 +36,7 @@ paths:
           description: Sort order
           required: false
           schema:
-            $ref: '#/components/schemas/SortOrder'
+            $ref: '../common_attributes.schema.yaml#/components/schemas/SortOrder'
         - name: 'page'
           in: query
           description: Page number
@@ -100,9 +100,3 @@ components:
         - 'is_default'
         - 'name'
         - 'updated_at'
-
-    SortOrder:
-      type: string
-      enum:
-        - 'asc'
-        - 'desc'