feat: guacd for rdp/vnc

backend/pkg/server/guacd/instruction.go

@@ -0,0 +1,46 @@
+package guacd
+
+import (
+	"fmt"
+	"strings"
+)
+const Delimiter = ';'
+
+type Instruction struct {
+	Opcode string
+	Args   []string
+	cache  string
+}
+
+func NewInstruction(opcode string, args ...string) *Instruction {
+	return &Instruction{
+		Opcode: opcode,
+		Args:   args,
+	}
+}
+
+func (i *Instruction) String() string {
+	if len(i.cache) > 0 {
+		return i.cache
+	}
+
+	i.cache = fmt.Sprintf("%d.%s", len(i.Opcode), i.Opcode)
+	for _, value := range i.Args {
+		i.cache += fmt.Sprintf(",%d.%s", len(value), value)
+	}
+	i.cache += string(Delimiter)
+	return i.cache
+}
+
+func (i *Instruction) Parse(content string) *Instruction {
+	if strings.LastIndex(content, ";") > 0 {
+		content = strings.TrimRight(content, ";")
+	}
+	elements := strings.Split(content, ",")
+
+	var args = make([]string, len(elements))
+	for i, e := range elements {
+		args[i] = strings.Split(e, ".")[1]
+	}
+	return NewInstruction(args[0], args[1:]...)
+}