119 lines
3.0 KiB
JavaScript
119 lines
3.0 KiB
JavaScript
/**
|
||
* 仅从服务端拉取启用题库，无本地题目保底。
|
||
*/
|
||
const { requestPromise } = require('./request')
|
||
|
||
function getAppSafe() {
|
||
try {
|
||
return getApp()
|
||
} catch (e) {
|
||
return null
|
||
}
|
||
}
|
||
|
||
function shuffleQuestions(questions) {
|
||
const arr = (questions || []).map(q => ({
|
||
...q,
|
||
options: (q.options || []).slice().sort(() => Math.random() - 0.5)
|
||
}))
|
||
for (let i = arr.length - 1; i > 0; i--) {
|
||
const j = Math.floor(Math.random() * (i + 1))
|
||
;[arr[i], arr[j]] = [arr[j], arr[i]]
|
||
}
|
||
return arr
|
||
}
|
||
|
||
function resolveEnterpriseIdForQuestionBank(opts) {
|
||
const o = opts || {}
|
||
if (Object.prototype.hasOwnProperty.call(o, 'enterpriseId')) {
|
||
const v = o.enterpriseId
|
||
if (v == null || v === '') {
|
||
return null
|
||
}
|
||
const n = Number(v)
|
||
return Number.isFinite(n) && n > 0 ? n : null
|
||
}
|
||
try {
|
||
const { getEnterpriseIdForApiPayload } = require('./enterpriseContext')
|
||
return getEnterpriseIdForApiPayload()
|
||
} catch (e) {
|
||
return null
|
||
}
|
||
}
|
||
|
||
function getTestQuestionDrawCount() {
|
||
const app = getAppSafe()
|
||
const n = app && app.globalData && app.globalData.testQuestionDrawCount
|
||
const num = parseInt(String(n == null || n === '' ? '0' : n), 10)
|
||
if (!Number.isFinite(num) || num <= 0) {
|
||
return 0
|
||
}
|
||
return Math.min(500, num)
|
||
}
|
||
|
||
function applyDrawCountAfterShuffle(questions) {
|
||
const n = getTestQuestionDrawCount()
|
||
if (!n || questions.length <= n) {
|
||
return questions
|
||
}
|
||
return questions.slice(0, n)
|
||
}
|
||
|
||
function parseJsonBody(raw) {
|
||
if (raw == null) return {}
|
||
if (typeof raw === 'object' && !Array.isArray(raw)) return raw
|
||
if (typeof raw === 'string') {
|
||
const s = raw.trim()
|
||
if (!s) return {}
|
||
try {
|
||
return JSON.parse(s)
|
||
} catch (e) {
|
||
return { _parseError: true }
|
||
}
|
||
}
|
||
return {}
|
||
}
|
||
|
||
function fetchQuestionBank(type, enterpriseId) {
|
||
const q = [`type=${encodeURIComponent(type)}`]
|
||
if (enterpriseId != null && Number(enterpriseId) > 0) {
|
||
q.push(`enterpriseId=${Number(enterpriseId)}`)
|
||
}
|
||
return requestPromise({
|
||
url: `/api/test/questions?${q.join('&')}`,
|
||
method: 'GET',
|
||
needAuth: true
|
||
}).then((res) => {
|
||
const body = parseJsonBody(res.data)
|
||
if (body._parseError) {
|
||
throw new Error('接口返回非 JSON，请检查 apiBase 与服务器域名')
|
||
}
|
||
if (body.code !== 200 || body.data == null) {
|
||
const msg = body.message || '拉取题库失败'
|
||
const hint = body.code === 401 || body.code === 403 ? `${msg}（请重新进入小程序）` : msg
|
||
throw new Error(hint)
|
||
}
|
||
const list = body.data.list
|
||
if (!Array.isArray(list)) {
|
||
throw new Error('题库格式错误')
|
||
}
|
||
return list
|
||
})
|
||
}
|
||
|
||
function loadQuestions(type, opts = {}) {
|
||
const enterpriseId = resolveEnterpriseIdForQuestionBank(opts)
|
||
return fetchQuestionBank(type, enterpriseId).then((list) => {
|
||
if (!list.length) {
|
||
throw new Error('暂无启用题目')
|
||
}
|
||
return applyDrawCountAfterShuffle(shuffleQuestions(list))
|
||
})
|
||
}
|
||
|
||
module.exports = {
|
||
fetchQuestionBank,
|
||
loadQuestions,
|
||
shuffleQuestions
|
||
}
|