/// <summary>
/// Creates a new <see cref="DiscordPermissionException"/> instance.
/// </summary>
/// <param name="member">The member that didn't have the right permissions.</param>
/// <param name="guild">The guild the member is in.</param>
/// <param name="channel">The channel the permissions were checked against.</param>
/// <param name="permission">The permissions that caused the exception.</param>
public DiscordPermissionException(DiscordGuildMember member, DiscordGuild guild, DiscordGuildChannel channel, DiscordPermission permission)
: base($"\"{member.User.Username}\" does not have permissions: {GetPermissions(permission)} in channel \"{channel.Name}\"")
{
Permission = permission;
Member = member;
Guild = guild;
Channel = channel;
}
/// <summary>
/// Returns whether the specified member has the given set of permissions
/// in the context of the specified guild channel.
/// </summary>
/// <param name="permissions">The set of permissions to check if the member has.</param>
/// <param name="member">The member to check the permissions of.</param>
/// <param name="guild">The guild this member is in.</param>
/// <param name="channel">
/// The guild channel to check the permissions against (this will take overwrites into account).
/// </param>
/// <exception cref="ArgumentException">
/// Thrown if <paramref name="member"/> or <paramref name="channel"/> is not in the
/// specified <paramref name="guild"/>
/// </exception>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="member"/>, <paramref name="guild"/>, or <paramref name="channel"/>
/// is null.
/// </exception>
public static bool HasPermission(DiscordPermission permissions,
DiscordGuildMember member, DiscordGuild guild, DiscordGuildChannel channel)
{
if (member == null)
{
throw new ArgumentNullException(nameof(member));
}
if (guild == null)
{
throw new ArgumentNullException(nameof(guild));
}
if (channel == null)
{
throw new ArgumentNullException(nameof(channel));
}
if (channel.GuildId != member.GuildId)
{
throw new ArgumentException("Guild channel must be in the same guild as this member.");
}
if (channel.GuildId != guild.Id)
{
throw new ArgumentException("Guild channel must be in the specified guild.");
}
// If owner, everything is true
if (member.Id == guild.OwnerId)
{
return(true);
}
// Apply @everyone permissions
DiscordRole everyoneRole = guild.Roles[guild.Id];
DiscordPermission userPermissions = everyoneRole.Permissions;
// Apply permissions for each role the member has
foreach (Snowflake roleId in member.RoleIds)
{
if (guild.Roles.TryGetValue(roleId, out DiscordRole role))
{
userPermissions = userPermissions | role.Permissions;
}
}
// Administrator overrides channel-specific overwrites
if (userPermissions.HasFlag(DiscordPermission.Administrator))
{
return(true);
}
// Apply channel @everyone overwrites
DiscordOverwrite channelEveryoneOverwrite;
if (channel.PermissionOverwrites.TryGetValue(guild.Id, out channelEveryoneOverwrite))
{
userPermissions = (userPermissions & (~channelEveryoneOverwrite.Deny)) | channelEveryoneOverwrite.Allow;
}
// Apply channel-specific role overwrites
DiscordPermission roleOverwriteAllow = 0;
DiscordPermission roleOverwriteDeny = 0;
foreach (Snowflake roleId in member.RoleIds)
{
DiscordOverwrite overwrite;
if (channel.PermissionOverwrites.TryGetValue(roleId, out overwrite))
{
roleOverwriteAllow = roleOverwriteAllow | overwrite.Allow;
roleOverwriteDeny = roleOverwriteDeny | overwrite.Deny;
}
}
userPermissions = (userPermissions & (~roleOverwriteDeny)) | roleOverwriteAllow;
// Apply channel-specific member overwrite for this channel
DiscordOverwrite memberOverwrite;
if (channel.PermissionOverwrites.TryGetValue(member.Id, out memberOverwrite))
{
userPermissions = (userPermissions & (~memberOverwrite.Deny)) | memberOverwrite.Allow;
}
// Check for correct permissions
return(userPermissions.HasFlag(DiscordPermission.Administrator) | userPermissions.HasFlag(permissions));
}
/// <summary>
/// Checks whether the specified member has the given set of permissions
/// in the context of the specified guild channel.
/// If they don't, a <see cref="DiscordPermissionException"/> is thrown with details.
/// </summary>
/// <param name="permissions">The set of permissions to check if the member has.</param>
/// <param name="member">The member to check the permissions of.</param>
/// <param name="guild">The guild this member is in.</param>
/// <param name="channel">
/// The guild channel to check the permissions against (this will take overwrites into account).
/// </param>
/// <exception cref="ArgumentException">
/// Thrown if <paramref name="member"/> or <paramref name="channel"/> is not in the
/// specified <paramref name="guild"/>
/// </exception>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="member"/>, <paramref name="guild"/>, or <paramref name="channel"/>
/// is null.
/// </exception>
public static void AssertPermission(DiscordPermission permissions,
DiscordGuildMember member, DiscordGuild guild, DiscordGuildChannel channel)
{
if (!HasPermission(permissions, member, guild, channel))
{
throw new DiscordPermissionException(member, guild, channel, permissions);
}
}
/// <summary> /// Checks whether this member has the given set of permissions /// in the context of the specified guild channel. /// If they don't, a <see cref="DiscordPermissionException"/> is thrown with details. /// </summary> /// <param name="permissions">The set of permissions to check if the member has.</param> /// <param name="guild">The guild this member is in.</param> /// <param name="channel"> /// The guild channel to check the permissions against (this will take overwrites into account). /// </param> /// <exception cref="ArgumentException"> /// Thrown if <paramref name="member"/> or <paramref name="channel"/> is not in the /// specified <paramref name="guild"/> /// </exception> /// <exception cref="ArgumentNullException"> /// Thrown if <paramref name="member"/>, <paramref name="guild"/>, or <paramref name="channel"/> /// is null. /// </exception> public static void AssertPermission(this DiscordGuildMember member, DiscordPermission permissions, DiscordGuild guild, DiscordGuildChannel channel) => DiscordPermissionHelper.AssertPermission(permissions, member, guild, channel);
/// <summary> /// Returns whether this member has the given set of permissions /// in the context of the specified guild channel. /// </summary> /// <param name="permissions">The set of permissions to check if the member has.</param> /// <param name="guild">The guild this member is in.</param> /// <param name="channel"> /// The guild channel to check the permissions against (this will take overwrites into account). /// </param> /// <exception cref="ArgumentException"> /// Thrown if <paramref name="member"/> or <paramref name="channel"/> is not in the /// specified <paramref name="guild"/> /// </exception> /// <exception cref="ArgumentNullException"> /// Thrown if <paramref name="member"/>, <paramref name="guild"/>, or <paramref name="channel"/> /// is null. /// </exception> public static bool HasPermission(this DiscordGuildMember member, DiscordPermission permissions, DiscordGuild guild, DiscordGuildChannel channel) => DiscordPermissionHelper.HasPermission(permissions, member, guild, channel);
