Refactor and update RocketChat bridge

* Add support for editing/deleting messages
* Add support for uploading files
* Add support for avatars
* Use the Rocket.Chat.Go.SDK
* Use the rest and streaming api

vendor/github.com/gopackage/ddp/ddp_messages.go

@@ -0,0 +1,82 @@
+package ddp
+
+// ------------------------------------------------------------
+// DDP Messages
+//
+// Go structs representing DDP raw messages ready for JSON
+// encoding.
+// ------------------------------------------------------------
+
+// Message contains the common fields that all DDP messages use.
+type Message struct {
+	Type string `json:"msg"`
+	ID   string `json:"id,omitempty"`
+}
+
+// Connect represents a DDP connect message.
+type Connect struct {
+	Message
+	Version string   `json:"version"`
+	Support []string `json:"support"`
+	Session string   `json:"session,omitempty"`
+}
+
+// NewConnect creates a new connect message
+func NewConnect() *Connect {
+	return &Connect{Message: Message{Type: "connect"}, Version: "1", Support: []string{"1"}}
+}
+
+// NewReconnect creates a new connect message with a session ID to resume.
+func NewReconnect(session string) *Connect {
+	c := NewConnect()
+	c.Session = session
+	return c
+}
+
+// Ping represents a DDP ping message.
+type Ping Message
+
+// NewPing creates a new ping message with optional ID.
+func NewPing(id string) *Ping {
+	return &Ping{Type: "ping", ID: id}
+}
+
+// Pong represents a DDP pong message.
+type Pong Message
+
+// NewPong creates a new pong message with optional ID.
+func NewPong(id string) *Pong {
+	return &Pong{Type: "pong", ID: id}
+}
+
+// Method is used to send a remote procedure call to the server.
+type Method struct {
+	Message
+	ServiceMethod string        `json:"method"`
+	Args          []interface{} `json:"params"`
+}
+
+// NewMethod creates a new method invocation object.
+func NewMethod(id, serviceMethod string, args []interface{}) *Method {
+	return &Method{
+		Message:       Message{Type: "method", ID: id},
+		ServiceMethod: serviceMethod,
+		Args:          args,
+	}
+}
+
+// Sub is used to send a subscription request to the server.
+type Sub struct {
+	Message
+	SubName string        `json:"name"`
+	Args    []interface{} `json:"params"`
+}
+
+// NewSub creates a new sub object.
+func NewSub(id, subName string, args []interface{}) *Sub {
+	return &Sub{
+		Message: Message{Type: "sub", ID: id},
+		SubName: subName,
+		Args:    args,
+	}
+}