manage connection parameters in a separate class

handshake/connection_parameters_manager.go

@@ -0,0 +1,53 @@
+package handshake
+
+import (
+	"errors"
+	"sync"
+)
+
+// ConnectionParametersManager stores the connection parameters
+type ConnectionParametersManager struct {
+	params map[Tag][]byte
+	mutex  sync.RWMutex
+}
+
+// ErrTagNotInConnectionParameterMap is returned when a tag is not present in the connection parameters
+var ErrTagNotInConnectionParameterMap = errors.New("Tag not found in ConnectionsParameter map")
+
+// NewConnectionParamatersManager creates a new connection parameters manager
+func NewConnectionParamatersManager() *ConnectionParametersManager {
+	cpm := &ConnectionParametersManager{
+		params: make(map[Tag][]byte),
+	}
+	return cpm
+}
+
+// SetFromMap reads all params
+func (h *ConnectionParametersManager) SetFromMap(params map[Tag][]byte) error {
+	h.mutex.Lock()
+	for key, value := range params {
+		h.params[key] = value
+	}
+	h.mutex.Unlock()
+	return nil
+}
+
+// GetRawValue gets the byte-slice for a tag
+func (h *ConnectionParametersManager) GetRawValue(tag Tag) ([]byte, error) {
+	h.mutex.RLock()
+	rawValue, ok := h.params[tag]
+	h.mutex.RUnlock()
+
+	if !ok {
+		return nil, ErrTagNotInConnectionParameterMap
+	}
+	return rawValue, nil
+}
+
+// GetSHLOMap gets all values (except crypto values) needed for the SHLO
+func (h *ConnectionParametersManager) GetSHLOMap() map[Tag][]byte {
+	return map[Tag][]byte{
+		TagICSL: []byte{0x1e, 0x00, 0x00, 0x00}, //30
+		TagMSPC: []byte{0x64, 0x00, 0x00, 0x00}, //100
+	}
+}