mirror of
https://github.com/ergochat/ergo.git
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142 lines
2.9 KiB
Go
142 lines
2.9 KiB
Go
package irc
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import (
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"strings"
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)
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type CapSubCommand string
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const (
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CAP_LS CapSubCommand = "LS"
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CAP_LIST CapSubCommand = "LIST"
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CAP_REQ CapSubCommand = "REQ"
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CAP_ACK CapSubCommand = "ACK"
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CAP_NAK CapSubCommand = "NAK"
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CAP_END CapSubCommand = "END"
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)
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// Capabilities are optional features a client may request from a server.
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type Capability string
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const (
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MultiPrefix Capability = "multi-prefix"
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SASL Capability = "sasl"
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)
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var (
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SupportedCapabilities = CapabilitySet{
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MultiPrefix: true,
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}
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)
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func (capability Capability) String() string {
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return string(capability)
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}
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// CapModifiers are indicators showing the state of a capability after a REQ or
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// ACK.
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type CapModifier rune
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const (
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Ack CapModifier = '~'
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Disable CapModifier = '-'
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Sticky CapModifier = '='
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)
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func (mod CapModifier) String() string {
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return string(mod)
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}
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type CapState uint
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const (
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CapNone CapState = iota
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CapNegotiating CapState = iota
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CapNegotiated CapState = iota
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)
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type CapabilitySet map[Capability]bool
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func (set CapabilitySet) String() string {
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strs := make([]string, len(set))
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index := 0
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for capability := range set {
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strs[index] = string(capability)
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index += 1
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}
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return strings.Join(strs, " ")
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}
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func (set CapabilitySet) DisableString() string {
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parts := make([]string, len(set))
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index := 0
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for capability := range set {
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parts[index] = Disable.String() + capability.String()
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index += 1
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}
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return strings.Join(parts, " ")
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}
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func (msg *CapCommand) HandleRegServer(server *Server) {
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client := msg.Client()
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switch msg.subCommand {
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case CAP_LS:
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client.capState = CapNegotiating
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client.Reply(RplCap(client, CAP_LS, SupportedCapabilities))
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case CAP_LIST:
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client.Reply(RplCap(client, CAP_LIST, client.capabilities))
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case CAP_REQ:
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for capability := range msg.capabilities {
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if !SupportedCapabilities[capability] {
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client.Reply(RplCap(client, CAP_NAK, msg.capabilities))
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return
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}
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}
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for capability := range msg.capabilities {
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client.capabilities[capability] = true
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}
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client.Reply(RplCap(client, CAP_ACK, msg.capabilities))
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case CAP_END:
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client.capState = CapNegotiated
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server.tryRegister(client)
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default:
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client.ErrInvalidCapCmd(msg.subCommand)
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}
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}
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func (msg *CapCommand) HandleServer(server *Server) {
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client := msg.Client()
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switch msg.subCommand {
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case CAP_LS:
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client.Reply(RplCap(client, CAP_LS, SupportedCapabilities))
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case CAP_LIST:
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client.Reply(RplCap(client, CAP_LIST, client.capabilities))
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case CAP_REQ:
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for capability := range msg.capabilities {
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if !SupportedCapabilities[capability] {
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client.Reply(RplCap(client, CAP_NAK, msg.capabilities))
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return
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}
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}
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for capability := range msg.capabilities {
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client.capabilities[capability] = true
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}
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client.Reply(RplCap(client, CAP_ACK, msg.capabilities))
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case CAP_END:
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// no-op after registration performed
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return
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default:
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client.ErrInvalidCapCmd(msg.subCommand)
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}
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}
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