discord.js - validate embed? - discord

Question

I want to validate a discord embed before sending it.
Which means, I want to know if an embed has nothing wrong with it before actually sending it on a channel.
var embed = {
title: 'some title',
description: 'some description',
color: 'foo bar'
}
// embed.color is not a valid color, so it will trigger an error when I send it.
// Here I want some way to know that there's something wrong with the embed object.
message.channel.send({embed});

Answer 1

I have made a function to validate embeds. However, it's incomplete and may have false positives or false negatives, but it should meet your needs.
function validURL(url) {
try {
new URL(url);
} catch (err) {
return false;
}
return true;
}
function validEmbed(embed) {
return Object.entries({
title: (title) => typeof title === 'string',
description: (description) => typeof description === 'string',
url: (url) => validURL(url),
timestamp: (timestamp) => (new Date(timestamp)).getTime() > 0,
color: (color) => typeof color === 'number',
fields: (fields) => fields.every(field => typeof field.name === 'string' && typeof field.value === 'string' && typeof field.inline === 'boolean'),
thumbnail: (thumbnail) => validURL(thumbnail.url),
image: (image) => validURL(image.url),
author: (author) => typeof author.name === 'string' && validURL(author.url) && validURL(author.icon_url),
footer: (footer) => typeof footer.text === 'string' && validURL(footer.icon_url)
}).every(field => {
if (!(field[0] in embed)) return true;
return embed[field[0]] && field[1](embed[field[0]]);
});
}
Here is an exaple snippet:
function validURL(e){try{new URL(e)}catch(e){return!1}return!0}function validEmbed(e){return Object.entries({title:e=>"string"==typeof e,description:e=>"string"==typeof e,url:e=>validURL(e),timestamp:e=>new Date(e).getTime()>0,color:e=>"number"==typeof e,fields:e=>e.every(e=>"string"==typeof e.name&&"string"==typeof e.value&&"boolean"==typeof e.inline),thumbnail:e=>validURL(e.url),image:e=>validURL(e.url),author:e=>"string"==typeof e.name&&validURL(e.url)&&validURL(e.icon_url),footer:e=>"string"==typeof e.text&&validURL(e.icon_url)}).every(t=>!(t[0]in e)||e[t[0]]&&t[1](e[t[0]]))}
/* returns true */
console.log(validEmbed({
title: 'The title'
}));
/* returns true */
console.log(validEmbed({
title: 'The title',
description: 'Sample Description.',
url: 'https://i.imgur.com/ttHwmCl.jpg',
timestamp: '2020-07-30T14:44:05.876Z',
color: 3447003,
fields: [{
name: 'name',
value: 'value',
inline: false
},
{
name: 'name2',
value: 'value2',
inline: true
}
],
thumbnail: {
url: 'attachment://stackoverflow2.jpg'
},
image: {
url: 'attachment://stackoverflow.jpg'
},
author: {
name: 'Daemon Beast',
url: 'https://i.imgur.com/P4L260P.jpg',
icon_url: 'https://i.imgur.com/P4L260P.jpg'
},
footer: {
text: 'footer text',
icon_url: 'https://i.imgur.com/ttHwmCl.jpg'
}
}));
/* returns false */
console.log(validEmbed({
author: 4567876567
}));