118 lines
2.8 KiB
Go
118 lines
2.8 KiB
Go
package witch
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import (
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"fmt"
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"log"
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"regexp"
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"github.com/vilmibm/hermeticum/server/db"
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lua "github.com/yuin/gopher-lua"
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)
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/*
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allows({
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read = "world",
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write = "owner"
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carry = "owner",
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execute = "world",
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})
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hears(".*eat.*", function()
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does("quivers nervously")
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end)
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`
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*/
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type ServerAPI struct {
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Tell func(int, string)
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Show func(int, string)
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}
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type VerbContext struct {
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Verb string
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Rest string
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Sender db.Object
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Target db.Object
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}
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type ScriptContext struct {
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script string
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incoming chan VerbContext
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serverAPI ServerAPI
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}
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func NewScriptContext(sAPI ServerAPI) (*ScriptContext, error) {
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sc := &ScriptContext{
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serverAPI: sAPI,
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}
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sc.incoming = make(chan VerbContext)
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go func() {
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var l *lua.LState
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var err error
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var vc VerbContext
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for {
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vc = <-sc.incoming
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if vc.Target.Script != sc.script {
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sc.script = vc.Target.Script
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l = lua.NewState()
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l.SetGlobal("has", l.NewFunction(witchHas))
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l.SetGlobal("hears", l.NewFunction(witchHears))
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l.SetGlobal("sees", l.NewFunction(witchSees))
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l.SetGlobal("_handlers", l.NewTable())
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if err := l.DoString(vc.Target.Script); err != nil {
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log.Printf("error parsing script %s: %s", vc.Target.Script, err.Error())
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}
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}
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l.SetGlobal("tellMe", l.NewFunction(func(l *lua.LState) int {
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sender := l.GetGlobal("sender").(*lua.LTable)
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senderID := int(lua.LVAsNumber(sender.RawGetString("ID")))
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sc.serverAPI.Tell(senderID, l.ToString(1))
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return 0
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}))
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l.SetGlobal("showMe", l.NewFunction(func(l *lua.LState) int {
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sender := l.GetGlobal("sender").(*lua.LTable)
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senderID := int(lua.LVAsNumber(sender.RawGetString("ID")))
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sc.serverAPI.Show(senderID, l.ToString(1))
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return 0
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}))
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// TODO check execute permission and bail out potentially
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log.Printf("%#v", vc)
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senderT := l.NewTable()
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senderT.RawSetString("name", lua.LString(vc.Sender.Data["name"]))
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senderT.RawSetString("ID", lua.LNumber(vc.Sender.ID))
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l.SetGlobal("sender", senderT)
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l.SetGlobal("msg", lua.LString(vc.Rest))
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handlers := l.GetGlobal("_handlers").(*lua.LTable)
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handlers.ForEach(func(k, v lua.LValue) {
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if k.String() != vc.Verb {
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return
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}
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v.(*lua.LTable).ForEach(func(kk, vv lua.LValue) {
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pattern := regexp.MustCompile(kk.String())
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if pattern.MatchString(vc.Rest) {
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// TODO TODO TODO TODO TODO
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// this could be a remote code execution vuln; but by being here, I
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// believe vc.Verb has been effectively validated as "not a pile of
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// lua code" since it matched a handler.
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if err = l.DoString(fmt.Sprintf(`_handlers.%s["%s"]()`, vc.Verb, pattern)); err != nil {
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log.Println(err.Error())
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}
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}
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})
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})
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}
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}()
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return sc, nil
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}
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func (sc *ScriptContext) Handle(vc VerbContext) {
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sc.incoming <- vc
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}
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