Dh password settings (#72)

* update package-lock.json

* Feat: password settings for account (#65)

* feat: password settings for account

* feat: password settings for account

* fix: review comments

* fix: review comments

* fix: review comments

* return empty json

* fix: after review

Co-authored-by: xquanluu <110280845+xquanluu@users.noreply.github.com>

lib/models/password-settings.js

@@ -0,0 +1,70 @@
+const {promisePool} = require('../db');
+
+class PasswordSettings {
+
+  /**
+   * Retrieve object from database
+   */
+  static async retrieve() {
+    const [r] = await promisePool.execute(`SELECT * FROM ${this.table}`);
+    return r;
+  }
+
+  /**
+  * Update object into the database
+  */
+  static async update(obj) {
+    let sql = `UPDATE ${this.table} SET `;
+    const values = [];
+    const keys = Object.keys(obj);
+    this.fields.forEach(({name}) => {
+      if (keys.includes(name)) {
+        sql = sql + `${name} = ?,`;
+        values.push(obj[name]);
+      }
+    });
+    if (values.length) {
+      sql = sql.slice(0, -1);
+      await promisePool.execute(sql, values);
+    }
+  }
+
+  /**
+     * insert object into the database
+     */
+  static async make(obj) {
+    let params = '', marks = '';
+    const values = [];
+    const keys = Object.keys(obj);
+    this.fields.forEach(({name}) => {
+      if (keys.includes(name)) {
+        params = params + `${name},`;
+        marks = marks + '?,';
+        values.push(obj[name]);
+      }
+    });
+    if (values.length) {
+      params = `(${params.slice(0, -1)})`;
+      marks = `values(${marks.slice(0, -1)})`;
+      return await promisePool.execute(`INSERT into ${this.table} ${params} ${marks}`, values);
+    }
+  }
+}
+
+
+PasswordSettings.table = 'password_settings';
+PasswordSettings.fields = [
+  {
+    name: 'min_password_length',
+    type: 'number'
+  },
+  {
+    name: 'require_digit',
+    type: 'number'
+  },
+  {
+    name: 'require_special_character',
+    type: 'number'
+  }
+];
+module.exports = PasswordSettings;