first version

libs/memstore.js

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+const store = {}
+
+const storeFunc = {
+  /**
+   * set store key vlaue
+   * @param {string} key
+   * @param {object} val
+   * @return {boolean}
+   */
+  set: (key, val) => {
+    if (typeof key !== 'string' || key.length === 0) return false
+    store[key] = val
+    return true
+  },
+  /**
+   * get store key value
+   * @param {string} key
+   * @return {object?}
+   */
+  get: (key) => {
+    if (typeof key !== 'string' || key.length === 0) return null
+    return store[key] || null
+  },
+  /**
+   * del store key vlaue
+   * @param {string} key
+   * @return {boolean}
+   */
+  del: (key) => {
+    if (typeof key !== 'string' || key.length === 0) return false
+    delete store[key]
+    return true
+  }
+}
+
+module.exports = storeFunc

libs/youtube.js

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+const exec = require('child_process').exec
+const command = 'youtube-dl'
+const cmdOpts = ['--id', '-x', '--audio-format', 'mp3']
+const config = require('@config/index.js')
+const cwd = config.download_location
+
+/**
+ * download youtube video
+ * @param {string} url
+ * @return {boolean}
+ */
+module.exports.download = async (url = '') => {
+  if (typeof url !== 'string' || url.trim().length === 0) return false
+
+  const result = await new Promise(resolve => {
+    exec(`${command} ${cmdOpts.join(' ')} "${url}"`, { cwd }, (err, sout, serr) => {
+      if (err) return resolve(false)
+      return resolve(true)
+    })
+  })
+
+  return result
+}
+
+/**
+ * get youtube video title
+ * @param {string} url
+ * @return {string}
+ */
+module.exports.getTitle = async (url = '') => {
+  if (typeof url !== 'string' || url.trim().length === 0) return ''
+
+  const result = await new Promise(resolve => {
+    exec(`${command} -e "${url}"`, { cwd }, (err, sout, serr) => {
+      if (err) return resolve('')
+      resolve(sout)
+    })
+  })
+  return result
+}