121 lines
4.5 KiB
JavaScript
121 lines
4.5 KiB
JavaScript
// @ts-check
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const DiscordTypes = require("discord-api-types/v10")
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const assert = require("assert").strict
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const EPOCH = 1420070400000
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/**
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* @param {string[]} userRoles
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* @param {DiscordTypes.APIGuild["roles"]} guildRoles
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* @param {string} [userID]
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* @param {DiscordTypes.APIGuildChannel["permission_overwrites"]} [channelOverwrites]
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*/
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function getPermissions(userRoles, guildRoles, userID, channelOverwrites) {
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let allowed = BigInt(0)
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let everyoneID
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// Guild allows
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for (const role of guildRoles) {
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if (role.name === "@everyone") {
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allowed |= BigInt(role.permissions)
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everyoneID = role.id
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}
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if (userRoles.includes(role.id)) {
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allowed |= BigInt(role.permissions)
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}
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}
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if (channelOverwrites) {
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/** @type {((overwrite: Required<DiscordTypes.APIGuildChannel>["permission_overwrites"][0]) => any)[]} */
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const actions = [
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// Channel @everyone deny
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overwrite => overwrite.id === everyoneID && (allowed &= ~BigInt(overwrite.deny)),
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// Channel @everyone allow
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overwrite => overwrite.id === everyoneID && (allowed |= BigInt(overwrite.allow)),
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// Role deny
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overwrite => userRoles.includes(overwrite.id) && (allowed &= ~BigInt(overwrite.deny)),
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// Role allow
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overwrite => userRoles.includes(overwrite.id) && (allowed |= BigInt(overwrite.allow)),
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// User deny
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overwrite => overwrite.id === userID && (allowed &= ~BigInt(overwrite.deny)),
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// User allow
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overwrite => overwrite.id === userID && (allowed |= BigInt(overwrite.allow))
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]
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for (let i = 0; i < actions.length; i++) {
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for (const overwrite of channelOverwrites) {
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actions[i](overwrite)
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}
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}
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}
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return allowed
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}
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/**
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* Note: You can only provide one permission bit to permissionToCheckFor. To check multiple permissions, call `hasAllPermissions` or `hasSomePermissions`.
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* It is designed like this to avoid developer error with bit manipulations.
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*
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* @param {bigint} resolvedPermissions
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* @param {bigint} permissionToCheckFor
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* @returns {boolean} whether the user has the requested permission
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* @example
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* const permissions = getPermissions(userRoles, guildRoles, userID, channelOverwrites)
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* hasPermission(permissions, DiscordTypes.PermissionFlagsBits.ViewChannel)
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*/
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function hasPermission(resolvedPermissions, permissionToCheckFor) {
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// Make sure permissionToCheckFor has exactly one permission in it
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assert.equal(permissionToCheckFor.toString(2).match(/1/g), 1)
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// Do the actual calculation
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return (resolvedPermissions & permissionToCheckFor) === permissionToCheckFor
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}
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/**
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* @param {bigint} resolvedPermissions
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* @param {(keyof DiscordTypes.PermissionFlagsBits)[]} permissionsToCheckFor
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* @returns {boolean} whether the user has any of the requested permissions
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* @example
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* const permissions = getPermissions(userRoles, guildRoles, userID, channelOverwrites)
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* hasSomePermissions(permissions, ["ViewChannel", "ReadMessageHistory"])
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*/
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function hasSomePermissions(resolvedPermissions, permissionsToCheckFor) {
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return permissionsToCheckFor.some(x => hasPermission(resolvedPermissions, DiscordTypes.PermissionFlagsBits[x]))
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}
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/**
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* @param {bigint} resolvedPermissions
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* @param {(keyof DiscordTypes.PermissionFlagsBits)[]} permissionsToCheckFor
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* @returns {boolean} whether the user has all of the requested permissions
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* @example
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* const permissions = getPermissions(userRoles, guildRoles, userID, channelOverwrites)
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* hasAllPermissions(permissions, ["ViewChannel", "ReadMessageHistory"])
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*/
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function hasAllPermissions(resolvedPermissions, permissionsToCheckFor) {
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return permissionsToCheckFor.every(x => hasPermission(resolvedPermissions, DiscordTypes.PermissionFlagsBits[x]))
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}
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/**
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* Command interaction responses have a webhook_id for some reason, but still have real author info of a real bot user in the server.
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* @param {DiscordTypes.APIMessage} message
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*/
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function isWebhookMessage(message) {
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const isInteractionResponse = message.type === 20
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return message.webhook_id && !isInteractionResponse
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}
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/** @param {string} snowflake */
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function snowflakeToTimestampExact(snowflake) {
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return Number(BigInt(snowflake) >> 22n) + EPOCH
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}
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/** @param {number} timestamp */
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function timestampToSnowflakeInexact(timestamp) {
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return String((timestamp - EPOCH) * 2**22)
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}
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module.exports.getPermissions = getPermissions
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module.exports.hasPermission = hasPermission
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module.exports.hasSomePermissions = hasSomePermissions
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module.exports.hasAllPermissions = hasAllPermissions
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module.exports.isWebhookMessage = isWebhookMessage
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module.exports.snowflakeToTimestampExact = snowflakeToTimestampExact
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module.exports.timestampToSnowflakeInexact = timestampToSnowflakeInexact
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