Check if the user adding a reaction has a role - node.js

Question

I want to check if the user reacting to a message has a role or not, so that if the user dont have a rank the bot will ignore the rest of the command, but I dont know how.
example: if a user with the admin rank reacted with :eggsa: emoji, the bot would continue with the command, but if i only had member rank the bot would ignore me.
client.on('messageReactionAdd', reaction => {
const eggsa = client.emojis.find(emoji => emoji.name === "eggsa");
if (reaction.emoji.name === 'eggsa') {
const message = reaction.message;
const kanal = reaction.message.guild.channels.find('name', 'sitater');
var embed = new Discord.RichEmbed()
.setAuthor(reaction.message.content)
.setTimestamp()
.setFooter(reaction.message.author.username, reaction.message.author.avatarURL)
kanal.send({embed});
}
});
the code works in this stage, only everyone can use it
I would be really grateful if someone could help me >:)

Answer 1

If you look at the messageReactionAdd docs you can see that along with the reaction, you can also get the user which added the reaction. So instead of
client.on('messageReactionAdd', reaction => {
You'd have
client.on('messageReactionAdd', (reaction, user) => {
So then you have the user and which is of type User. Because the user isn't of type GuildMember you first need to fetch the correct Guild member before you can check his/her role.
The easiest way to do this is by getting the Message to which the reaction was added with const msg = reaction.message;. Then you can get the guild from the message with const guild = msg.guild;. Now you can access the guild members with const guildMembers = guild.members;. Lastly you'd need to find the correct member with const guildMember = guildMembers.get(user.id);.
Now that you have your Guild Member you can access his/her Roles and thus check whether he/she has or does not have a certain role