commit first pass at module

Author: Brad Carson

README.md

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+This module exists to get around the 50 page limit defined in the JSON:API module by extending the EntityResource service and overriding a couple of classes and functions. There are plenty of valid points on why you would want to do this and why you shouldn't. See this [discussion](https://www.drupal.org/project/jsonapi/issues/2793233).
+
+To use: Simply change SIZE_MAX in src/Query/CustomOffsetPage.php to whatever you'd like. I've set it to 500 here since I'm using the API internally.
+
+For further reference, see the [JSON API](https://www.drupal.org/docs/8/modules/json-api) documentation.
+
+In the future, may want to add this as a configurable option in the UI.

jsonapi_custom_limit.info.yml

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+name: "JSON:API Custom Page Limit"
+type: module
+description: "Allows you to change the imposed 50 page result limit from jsonapi module."
+core: 8.x
+package: "Web Services"
+version: 1.0.0
+
+dependencies:
+  - jsonapi:jsonapi (>=8.x-2.4)

jsonapi_custom_limit.services.yml

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+services:
+  jsonapi.entity_resource:
+    class: Drupal\jsonapi_custom_limit\Controller\CustomEntityResource
+    arguments:
+      - "@entity_type.manager"
+      - "@entity_field.manager"
+      - "@jsonapi.resource_type.repository"
+      - "@renderer"
+      - "@entity.repository"
+      - "@jsonapi.include_resolver"
+      - "@jsonapi.entity_access_checker"
+      - "@jsonapi.field_resolver"
+      - "@jsonapi.serializer"
+      - "@datetime.time"
+      - "@current_user"
+# - { name: http_middleware, priority: 201 }

src/Controller/CustomEntityResource.php

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+<?php
+
+namespace Drupal\jsonapi_custom_limit\Controller;
+
+use Drupal\jsonapi\Controller\EntityResource;
+use Drupal\jsonapi\Query\Filter;
+use Drupal\jsonapi\Query\Sort;
+use Drupal\jsonapi\ResourceType\ResourceType;
+use Drupal\jsonapi_custom_limit\Query\CustomOffsetPage;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ *
+ * Overridden and extended from jsonapi module to get around the 50 results limit
+ *
+ */
+class CustomEntityResource extends EntityResource {
+
+  /**
+   * Extracts JSON:API query parameters from the request.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request object.
+   * @param \Drupal\jsonapi\ResourceType\ResourceType $resource_type
+   *   The JSON:API resource type.
+   *
+   * @return array
+   *   An array of JSON:API parameters like `sort` and `filter`.
+   */
+  protected function getJsonApiParams(Request $request, ResourceType $resource_type) {
+    if ($request->query->has('filter')) {
+      $params[Filter::KEY_NAME] = Filter::createFromQueryParameter($request->query->get('filter'), $resource_type, $this->fieldResolver);
+    }
+    if ($request->query->has('sort')) {
+      $params[Sort::KEY_NAME] = Sort::createFromQueryParameter($request->query->get('sort'));
+    }
+    if ($request->query->has('page')) {
+      $params[CustomOffsetPage::KEY_NAME] = CustomOffsetPage::createFromQueryParameter($request->query->get('page'));
+    } else {
+      $params[CustomOffsetPage::KEY_NAME] = CustomOffsetPage::createFromQueryParameter(['page' => ['offset' => CustomOffsetPage::DEFAULT_OFFSET, 'limit' => CustomOffsetPage::SIZE_MAX]]);
+    }
+
+    return $params;
+  }
+}

src/Query/CustomOffsetPage.php

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+<?php
+
+namespace Drupal\jsonapi_custom_limit\Query;
+
+use Drupal\jsonapi\Query\OffsetPage;
+
+/**
+ * Value object for containing the requested offset and page parameters.
+ *
+ * Overrides OffsetPage from the jsonapi module to get around the 50 results limit.
+ *
+ */
+class CustomOffsetPage extends OffsetPage {
+
+  /**
+   * Max size.
+   *
+   * @var int
+   */
+  const SIZE_MAX = 500;
+
+}