out-of-your-element/discord/utils.js

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// @ts-check
const DiscordTypes = require("discord-api-types/v10")
const EPOCH = 1420070400000
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/**
* @param {string[]} userRoles
* @param {DiscordTypes.APIGuild["roles"]} guildRoles
* @param {string} [userID]
* @param {DiscordTypes.APIGuildChannel["permission_overwrites"]} [channelOverwrites]
*/
function getPermissions(userRoles, guildRoles, userID, channelOverwrites) {
let allowed = BigInt(0)
let everyoneID
// Guild allows
for (const role of guildRoles) {
if (role.name === "@everyone") {
allowed |= BigInt(role.permissions)
everyoneID = role.id
}
if (userRoles.includes(role.id)) {
allowed |= BigInt(role.permissions)
}
}
if (channelOverwrites) {
/** @type {((overwrite: Required<DiscordTypes.APIGuildChannel>["permission_overwrites"][0]) => any)[]} */
const actions = [
// Channel @everyone deny
overwrite => overwrite.id === everyoneID && (allowed &= ~BigInt(overwrite.deny)),
// Channel @everyone allow
overwrite => overwrite.id === everyoneID && (allowed |= BigInt(overwrite.allow)),
// Role deny
overwrite => userRoles.includes(overwrite.id) && (allowed &= ~BigInt(overwrite.deny)),
// Role allow
overwrite => userRoles.includes(overwrite.id) && (allowed |= BigInt(overwrite.allow)),
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// User deny
overwrite => overwrite.id === userID && (allowed &= ~BigInt(overwrite.deny)),
// User allow
overwrite => overwrite.id === userID && (allowed |= BigInt(overwrite.allow))
]
for (let i = 0; i < actions.length; i++) {
for (const overwrite of channelOverwrites) {
actions[i](overwrite)
}
}
}
return allowed
}
/**
* Command interaction responses have a webhook_id for some reason, but still have real author info of a real bot user in the server.
* @param {DiscordTypes.APIMessage} message
*/
function isWebhookMessage(message) {
const isInteractionResponse = message.type === 20
return message.webhook_id && !isInteractionResponse
}
/** @param {string} snowflake */
function snowflakeToTimestampExact(snowflake) {
return Number(BigInt(snowflake) >> 22n) + EPOCH
}
/** @param {number} timestamp */
function timestampToSnowflakeInexact(timestamp) {
return String((timestamp - EPOCH) * 2**22)
}
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module.exports.getPermissions = getPermissions
module.exports.isWebhookMessage = isWebhookMessage
module.exports.snowflakeToTimestampExact = snowflakeToTimestampExact
module.exports.timestampToSnowflakeInexact = timestampToSnowflakeInexact