Dashboard: support filtering stories by taxonomy

includes/Admin/Dashboard.php

@@ -303,6 +303,13 @@ public function load_stories_dashboard(): void {
 			'/web-stories/v1/settings/',
 			'/web-stories/v1/publisher-logos/',
 			'/web-stories/v1/users/me/',
+			'/web-stories/v1/taxonomies/?' . build_query(
+				[
+					'type'         => $this->story_post_type->get_slug(),
+					'context'      => 'edit',
+					'hierarchical' => 'true',
+				]
+			),
 			$rest_url . '?' . build_query(
 				[
 					'_embed'                => rawurlencode(
@@ -456,6 +463,7 @@ public function get_dashboard_settings(): array {
 				'settings'       => '/web-stories/v1/settings/',
 				'pages'          => '/wp/v2/pages/',
 				'publisherLogos' => '/web-stories/v1/publisher-logos/',
+				'taxonomies'     => '/web-stories/v1/taxonomies/',
 				'products'       => '/web-stories/v1/products/',
 			],
 			'vendors'                 => $vendors,

packages/dashboard/src/app/api/apiProvider.js

@@ -26,11 +26,13 @@ import { createContext } from '@googleforcreators/react';
 import useStoryApi from './useStoryApi';
 import useTemplateApi from './useTemplateApi';
 import useUsersApi from './useUsersApi';
+import useTaxonomyApi from './useTaxonomyApi';
 
 export const ApiContext = createContext({ state: {}, actions: {} });
 
 export default function ApiProvider({ children }) {
   const { api: usersApi } = useUsersApi();
+  const { api: taxonomyApi } = useTaxonomyApi();
   const { templates, api: templateApi } = useTemplateApi();
   const { stories, api: storyApi } = useStoryApi();
 
@@ -43,6 +45,7 @@ export default function ApiProvider({ children }) {
       storyApi,
       templateApi,
       usersApi,
+      taxonomyApi,
     },
   };
 

packages/dashboard/src/app/api/useTaxonomyApi.js

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * Internal dependencies
+ */
+import { useConfig } from '../config';
+
+function useTaxonomyApi() {
+  const {
+    apiCallbacks: { getTaxonomies, getTaxonomyTerms },
+  } = useConfig();
+
+  return {
+    api: {
+      getTaxonomies,
+      getTaxonomyTerms,
+    },
+  };
+}
+
+export default useTaxonomyApi;

packages/dashboard/src/app/views/myStories/filters/provider.js

@@ -0,0 +1,134 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * External dependencies
+ */
+import {
+  createContext,
+  useReducer,
+  useEffect,
+  useCallback,
+  useMemo,
+} from '@googleforcreators/react';
+import PropTypes from 'prop-types';
+
+/** @typedef {import('react')} Node */
+
+/**
+ * Internal dependencies
+ */
+import reducer from './reducer';
+import useTaxonomyFilters from './taxonomy/useTaxonomyFilters';
+import * as types from './types';
+
+export const filterContext = createContext({
+  state: {},
+  actions: {},
+});
+
+/**
+ * Keeps track of the current filters state.
+ *
+ * Each filter will have its own logic associated with
+ * initilization and how to query terms.
+ *
+ *
+ * @param {Object} root0 props for the provider
+ * @param {Node} root0.children the children to be rendered
+ * @return {Node} React node
+ */
+
+export default function FiltersProvider({ children }) {
+  // each filter type will have its own logic for initilizing and querying
+  const { initializeTaxonomyFilters } = useTaxonomyFilters();
+
+  const [state, dispatch] = useReducer(reducer, {
+    filtersLoading: true,
+    filters: [],
+  });
+
+  /**
+   * Dispatch UPDATE_FILTER with new data for a given filter
+   *
+   * @param {string} key key property on one of the filter objects
+   * @param {Object} value the properties with updated values
+   * @return {void}
+   */
+  const updateFilter = useCallback((key, value) => {
+    dispatch({ type: types.UPDATE_FILTER, payload: { key, value } });
+  }, []);
+
+  /**
+   * Dispatch REGISTER_FILTERS with all the filters data
+   *
+   * @param {Array} payload array of filters data
+   * @return {void}
+   */
+  const registerFilters = useCallback((value) => {
+    dispatch({ type: types.REGISTER_FILTERS, payload: { value } });
+  }, []);
+
+  /**
+   * Sets up the shape of the filters data
+   * and calls registerFilters with all filters.
+   *
+   * @return {void}
+   */
+  const initializeFilters = useCallback(() => {
+    const filters = initializeTaxonomyFilters();
+
+    registerFilters(filters);
+  }, [registerFilters, initializeTaxonomyFilters]);
+
+  /**
+   * Returns a object where the keys are the filter keys
+   * and the values are the filterId
+   *
+   * @return {Object}
+   */
+  const getFiltersObject = useCallback(() => {
+    const filterObj = {};
+    for (const filter of state.filters) {
+      const { key, filterId } = filter;
+      if (filterId) {
+        filterObj[key] = filterId;
+      }
+    }
+    return filterObj;
+  }, [state.filters]);
+
+  const contextValue = useMemo(() => {
+    return {
+      state,
+      actions: { updateFilter, registerFilters, getFiltersObject },
+    };
+  }, [state, updateFilter, registerFilters, getFiltersObject]);
+
+  useEffect(() => {
+    initializeFilters();
+  }, [initializeFilters]);
+
+  return (
+    <filterContext.Provider value={contextValue}>
+      {children}
+    </filterContext.Provider>
+  );
+}
+
+FiltersProvider.propTypes = {
+  children: PropTypes.node,
+};

packages/dashboard/src/app/views/myStories/filters/reducer.js

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Internal dependencies
+ */
+import * as types from './types';
+
+/**
+ * Update the filters state
+ *
+ * TODO: May need updating to handle all filter types within the dashboard.
+ *
+ * @param {Object} state Current state
+ * @param {Object} payload Action payload
+ * @param {string} payload.key Key for associated filter.
+ * @param {Object} payload.value Value to set on the filter.
+ * @return {Object} New state
+ */
+
+const reducer = (state, { type, payload = {} }) => {
+  switch (type) {
+    case types.UPDATE_FILTER: {
+      const { key, value } = payload;
+      const filter = state.filters.find((f) => f.key === key);
+
+      if (!filter) {
+        return state;
+      }
+
+      // remove 'filter-by' value
+      if (value.filterId && filter?.filterId === value.filterId) {
+        value.filterId = null;
+      }
+
+      // replace old filter
+      const idx = state.filters.indexOf(filter);
+      const filters = [...state.filters];
+      filters[idx] = { ...filter, ...value };
+
+      return {
+        ...state,
+        filters,
+      };
+    }
+
+    case types.REGISTER_FILTERS: {
+      const { value } = payload;
+      return {
+        ...state,
+        filtersLoading: false,
+        filters: value,
+      };
+    }
+    default:
+      return state;
+  }
+};
+
+export default reducer;