Add support for fetching challenge statistics

src/actions/challenge.js

@@ -392,6 +392,25 @@ function getSubmissionInformationDone(challengeId, submissionId, tokenV3) {
     });
 }
 
+/**
+ * @static
+ * @desc Creates an action that signals beginning of fetching challenge statistics
+ * @return {Action}
+ */
+ function fetchChallengeStatisticsInit() {}
+
+/**
+ * @static
+ * @desc Creates an action that gets challenge statistics from the backend.
+ * @param {String} challengeId The challenge id
+ * @param {String} tokenV3 Topcoder auth token v3.
+ * @return {Action}
+ */
+function fetchChallengeStatisticsDone(challengeId, tokenV3) {
+  const challengeService = getChallengesService(tokenV3);
+  return challengeService.getChallengeStatistics(challengeId)
+}
+
 export default createActions({
   CHALLENGE: {
     DROP_CHECKPOINTS: dropCheckpoints,
@@ -417,5 +436,7 @@ export default createActions({
     GET_MM_SUBMISSIONS_DONE: getMMSubmissionsDone,
     GET_SUBMISSION_INFORMATION_INIT: getSubmissionInformationInit,
     GET_SUBMISSION_INFORMATION_DONE: getSubmissionInformationDone,
+    GET_CHALLENGE_STATISTICS_INIT: fetchChallengeStatisticsInit,
+    GET_CHALLENGE_STATISTICS_DONE: fetchChallengeStatisticsDone,
   },
 });

src/reducers/challenge.js

@@ -368,6 +368,39 @@ function onGetSubmissionInformationDone(state, action) {
   };
 }
 
+/**
+ * Handles CHALLENGE/GET_CHALLENGE_STATISTICS_INIT action.
+ * @param {Object} state
+ * @param {Object} action
+ * @return {Object} New state.
+ */
+ function onFetchChallengeStatisticsInit(state, action) {
+  return {
+    ...state,
+    statisticsData: [],
+  };
+}
+
+/**
+ * Handles CHALLENGE/GET_CHALLENGE_STATISTICS_DONE action.
+ * @param {Object} state Previous state.
+ * @param {Object} action Action.
+ */
+function onFetchChallengeStatisticsDone(state, action) {
+  if (action.error) {
+    logger.error('Failed to get challenge statistics', action.payload);
+    return {
+      ...state,
+      statisticsData: [],
+    };
+  }
+
+  return {
+    ...state,
+    statisticsData: action.payload,
+  };
+}
+
 /**
  * Creates a new Challenge reducer with the specified initial state.
  * @param {Object} initialState Optional. Initial state.
@@ -411,6 +444,8 @@ function create(initialState) {
     [a.getActiveChallengesCountDone]: onGetActiveChallengesCountDone,
     [a.getSubmissionInformationInit]: onGetSubmissionInformationInit,
     [a.getSubmissionInformationDone]: onGetSubmissionInformationDone,
+    [a.fetchChallengeStatisticsInit]: onFetchChallengeStatisticsInit,
+    [a.fetchChallengeStatisticsDone]: onFetchChallengeStatisticsDone,
   }, _.defaults(initialState, {
     details: null,
     loadingCheckpoints: false,
@@ -427,6 +462,7 @@ function create(initialState) {
     updatingChallengeUuid: '',
     mmSubmissions: [],
     submissionInformation: null,
+    statisticsData: []
   }));
 }
 

src/services/challenges.js

@@ -253,6 +253,21 @@ class ChallengesService {
     };
   }
 
+  /**
+   * Gets challenge statistics.
+   * @param {Number} challengeId
+   * @return {Promise} The array of statistics
+   */
+  async getChallengeStatistics (challengeId) {
+    return this.private.apiV5.get(`/challenges/${challengeId}/statistics`)
+      .then(res => (res.ok ? res.json() : new Error(res.statusText)))
+      .then(res => (
+        res.message
+          ? new Error(res.message)
+          : res
+      ));
+  }
+
   /**
    * Activates the specified challenge.
    * @param {Number} challengeId