API: Added new tags API endpoints

app/Activity/Controllers/TagApiController.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BookStack\Activity\Controllers;
+
+use BookStack\Activity\TagRepo;
+use BookStack\Http\ApiController;
+use Illuminate\Http\JsonResponse;
+
+class TagApiController extends ApiController
+{
+    public function __construct(
+        protected TagRepo $tagRepo,
+    ) {
+    }
+
+    /**
+     * Get a list of tag names used in the system.
+     * You'll only see results based on tags applied to content you have access to.
+     * Only the name field can be used in filters.
+     */
+    public function listNames(): JsonResponse
+    {
+        $tagQuery = $this->tagRepo
+            ->queryWithTotalsForApi('');
+
+        return $this->apiListingResponse($tagQuery, [
+            'name', 'values', 'usages', 'page_count', 'chapter_count', 'book_count', 'shelf_count',
+        ], [], [
+            'name'
+        ]);
+    }
+
+    /**
+     * Get a list of tag values used in the system, which have been used for the given tag name.
+     * You'll only see results based on tags applied to content you have access to.
+     * Only the value field can be used in filters.
+     */
+    public function listValues(string $name): JsonResponse
+    {
+        $tagQuery = $this->tagRepo
+            ->queryWithTotalsForApi($name);
+
+        return $this->apiListingResponse($tagQuery, [
+            'name', 'value', 'usages', 'page_count', 'chapter_count', 'book_count', 'shelf_count',
+        ], [], [
+            'name', 'value',
+        ]);
+    }
+}

app/Activity/Controllers/TagController.php

@@ -24,9 +24,9 @@ class TagController extends Controller
             'usages' => trans('entities.tags_usages'),
         ]);
 
-        $nameFilter = $request->get('name', '');
+        $nameFilter = $request->input('name', '');
         $tags = $this->tagRepo
-            ->queryWithTotals($listOptions, $nameFilter)
+            ->queryWithTotalsForList($listOptions, $nameFilter)
             ->paginate(50)
             ->appends(array_filter(array_merge($listOptions->getPaginationAppends(), [
                 'name'   => $nameFilter,

app/Activity/TagRepo.php

@@ -18,9 +18,10 @@ class TagRepo
     }
 
     /**
-     * Start a query against all tags in the system.
+     * Start a query against all tags in the system, with total counts for their usage,
+     * suitable for a system interface list with listing options.
      */
-    public function queryWithTotals(SimpleListOptions $listOptions, string $nameFilter): Builder
+    public function queryWithTotalsForList(SimpleListOptions $listOptions, string $nameFilter): Builder
     {
         $searchTerm = $listOptions->getSearch();
         $sort = $listOptions->getSort();
@@ -28,17 +29,34 @@ class TagRepo
             $sort = 'value';
         }
 
+        $query = $this->baseQueryWithTotals($nameFilter, $searchTerm)
+            ->orderBy($sort, $listOptions->getOrder());
+
+        return $this->permissions->restrictEntityRelationQuery($query, 'tags', 'entity_id', 'entity_type');
+    }
+
+    /**
+     * Start a query against all tags in the system, with total counts for their usage,
+     * which can be used via the API.
+     */
+    public function queryWithTotalsForApi(string $nameFilter): Builder
+    {
+        $query = $this->baseQueryWithTotals($nameFilter, '');
+        return $this->permissions->restrictEntityRelationQuery($query, 'tags', 'entity_id', 'entity_type');
+    }
+
+    protected function baseQueryWithTotals(string $nameFilter, string $searchTerm): Builder
+    {
         $query = Tag::query()
             ->select([
                 'name',
                 ($searchTerm || $nameFilter) ? 'value' : DB::raw('COUNT(distinct value) as `values`'),
                 DB::raw('COUNT(id) as usages'),
-                DB::raw('SUM(IF(entity_type = \'page\', 1, 0)) as page_count'),
-                DB::raw('SUM(IF(entity_type = \'chapter\', 1, 0)) as chapter_count'),
-                DB::raw('SUM(IF(entity_type = \'book\', 1, 0)) as book_count'),
-                DB::raw('SUM(IF(entity_type = \'bookshelf\', 1, 0)) as shelf_count'),
+                DB::raw('CAST(SUM(IF(entity_type = \'page\', 1, 0)) as UNSIGNED) as page_count'),
+                DB::raw('CAST(SUM(IF(entity_type = \'chapter\', 1, 0)) as UNSIGNED) as chapter_count'),
+                DB::raw('CAST(SUM(IF(entity_type = \'book\', 1, 0)) as UNSIGNED) as book_count'),
+                DB::raw('CAST(SUM(IF(entity_type = \'bookshelf\', 1, 0)) as UNSIGNED) as shelf_count'),
             ])
-            ->orderBy($sort, $listOptions->getOrder())
             ->whereHas('entity');
 
         if ($nameFilter) {
@@ -57,7 +75,7 @@ class TagRepo
             });
         }
 
-        return $this->permissions->restrictEntityRelationQuery($query, 'tags', 'entity_id', 'entity_type');
+        return $query;
     }
 
     /**

app/Api/ListingResponseBuilder.php

@@ -18,6 +18,13 @@ class ListingResponseBuilder
      */
     protected array $fields;
 
+    /**
+     * Which fields are filterable.
+     * When null, the $fields above are used instead (Allow all fields).
+     * @var string[]|null
+     */
+    protected array|null $filterableFields = null;
+
     /**
      * @var array<callable>
      */
@@ -54,7 +61,7 @@ class ListingResponseBuilder
     {
         $filteredQuery = $this->filterQuery($this->query);
 
-        $total = $filteredQuery->count();
+        $total = $filteredQuery->getCountForPagination();
         $data = $this->fetchData($filteredQuery)->each(function ($model) {
             foreach ($this->resultModifiers as $modifier) {
                 $modifier($model);
@@ -77,6 +84,14 @@ class ListingResponseBuilder
         $this->resultModifiers[] = $modifier;
     }
 
+    /**
+     * Limit filtering to just the given set of fields.
+     */
+    public function setFilterableFields(array $fields): void
+    {
+        $this->filterableFields = $fields;
+    }
+
     /**
      * Fetch the data to return within the response.
      */
@@ -94,7 +109,7 @@ class ListingResponseBuilder
     protected function filterQuery(Builder $query): Builder
     {
         $query = clone $query;
-        $requestFilters = $this->request->get('filter', []);
+        $requestFilters = $this->request->input('filter', []);
         if (!is_array($requestFilters)) {
             return $query;
         }
@@ -114,10 +129,11 @@ class ListingResponseBuilder
     protected function requestFilterToQueryFilter($fieldKey, $value): ?array
     {
         $splitKey = explode(':', $fieldKey);
-        $field = $splitKey[0];
+        $field = strtolower($splitKey[0]);
         $filterOperator = $splitKey[1] ?? 'eq';
 
-        if (!in_array($field, $this->fields)) {
+        $filterFields = $this->filterableFields ?? $this->fields;
+        if (!in_array($field, $filterFields)) {
             return null;
         }
 
@@ -140,8 +156,8 @@ class ListingResponseBuilder
         $defaultSortName = $this->fields[0];
         $direction = 'asc';
 
-        $sort = $this->request->get('sort', '');
-        if (strpos($sort, '-') === 0) {
+        $sort = $this->request->input('sort', '');
+        if (str_starts_with($sort, '-')) {
             $direction = 'desc';
         }
 
@@ -160,9 +176,9 @@ class ListingResponseBuilder
     protected function countAndOffsetQuery(Builder $query): Builder
     {
         $query = clone $query;
-        $offset = max(0, $this->request->get('offset', 0));
+        $offset = max(0, $this->request->input('offset', 0));
         $maxCount = config('api.max_item_count');
-        $count = $this->request->get('count', config('api.default_item_count'));
+        $count = $this->request->input('count', config('api.default_item_count'));
         $count = max(min($maxCount, $count), 1);
 
         return $query->skip($offset)->take($count);

app/Http/ApiController.php

@@ -20,10 +20,14 @@ abstract class ApiController extends Controller
      * Provide a paginated listing JSON response in a standard format
      * taking into account any pagination parameters passed by the user.
      */
-    protected function apiListingResponse(Builder $query, array $fields, array $modifiers = []): JsonResponse
+    protected function apiListingResponse(Builder $query, array $fields, array $modifiers = [], array $filterableFields = []): JsonResponse
     {
         $listing = new ListingResponseBuilder($query, request(), $fields);
 
+        if (count($filterableFields) > 0) {
+            $listing->setFilterableFields($filterableFields);
+        }
+
         foreach ($modifiers as $modifier) {
             $listing->modifyResults($modifier);
         }

routes/api.php

@@ -7,6 +7,7 @@
  */
 
 use BookStack\Activity\Controllers as ActivityControllers;
+use BookStack\Activity\Controllers\TagApiController;
 use BookStack\Api\ApiDocsController;
 use BookStack\App\SystemApiController;
 use BookStack\Entities\Controllers as EntityControllers;
@@ -109,6 +110,9 @@ Route::get('search', [SearchApiController::class, 'all']);
 
 Route::get('system', [SystemApiController::class, 'read']);
 
+Route::get('tags/names', [TagApiController::class, 'listNames']);
+Route::get('tags/name/{name}/values', [TagApiController::class, 'listValues']);
+
 Route::get('users', [UserApiController::class, 'list']);
 Route::post('users', [UserApiController::class, 'create']);
 Route::get('users/{id}', [UserApiController::class, 'read']);