habitica-self-host/website/client/store/actions/challenges.js

import axios from 'axios';
import omit from 'lodash/omit';

export async function createChallenge (store, payload) {
  let response = await axios.post('/api/v3/challenges', {
    data: payload.challenge,
  });

  return response.data.data;
}

export async function joinChallenge (store, payload) {
  let response = await axios.post(`/api/v3/challenges/${payload.challengeId}/join`);

  return response.data.data;
}

export async function leaveChallenge (store, payload) {
  let response = await axios.post(`/api/v3/challenges/${payload.challengeId}/leave`, {
    data: {
      keep: payload.keep,
    },
  });

  return response.data.data;
}

export async function getUserChallenges () {
  let response = await axios.get('/api/v3/challenges/user');

  return response.data.data;
}

export async function getGroupChallenges (store, payload) {
  let response = await axios.get(`/api/v3/challenges/groups/${payload.groupId}`);

  return response.data.data;
}

export async function getChallenge (store, payload) {
  let response = await axios.get(`/api/v3/challenges/${payload.challengeId}`);

  return response.data.data;
}

export async function exportChallengeCsv (store, payload) {
  let response = await axios.get(`/api/v3/challenges/challenges/${payload.challengeId}/export/csv`);

  return response.data.data;
}


export async function updateChallenge (store, payload) {
  let challengeDataToSend = omit(payload.challenge, ['tasks', 'habits', 'todos', 'rewards', 'group']);

  if (challengeDataToSend.leader && challengeDataToSend.leader._id) challengeDataToSend.leader = challengeDataToSend.leader._id;

  let response = await axios.post(`/api/v3/challenges/${payload.challenge._id}`, {
    data: challengeDataToSend,
  });

  return response.data.data;
}

export async function deleteChallenge (store, payload) {
  let response = await axios.delete(`/api/v3/challenges/challenges/${payload.challengeId}`);

  return response.data.data;
}

export async function selectChallengeWinner (store, payload) {
  let response = await axios.post(`/api/v3/challenges/challenges/${payload.challengeId}/selectWinner/${payload.winnerId}`);

  return response.data.data;
}