adc: some basic protocol understanding

--HG--
branch : adc

AdcProtocol.go

@@ -1,12 +1,32 @@
 package libnmdc
 
+import (
+	"strings"
+)
+
+type adcState int
+
+const (
+	adcStateProtocol adcState = 0
+	adcStateIdentify adcState = 1
+	adcStateVerify   adcState = 2
+	adcStateNormal   adcState = 3
+	adcStateData     adcState = 4
+)
+
 type AdcProtocol struct {
 	hc       *HubConnection
+	state    adcState
+	sid      string
+	supports map[string]struct{}
 }
 
 func NewAdcProtocol(hc *HubConnection) Protocol {
-	proto := AdcProtocol{}
-	proto.hc = hc
+	proto := AdcProtocol{
+		hc:       hc,
+		state:    adcStateProtocol,
+		supports: make(map[string]struct{}),
+	}
 
 	// Start logging in
 	hc.SayRaw("HSUP ADBASE ADTIGR\n")
@@ -16,6 +36,123 @@ func NewAdcProtocol(hc *HubConnection) Protocol {
 
 func (this *AdcProtocol) ProcessCommand(msg string) {
 	this.hc.processEvent(HubEvent{EventType: EVENT_DEBUG_MESSAGE, Message: msg})
+
+	if len(msg) == 0 {
+		return
+	}
+
+	parts := strings.Split(msg, " ")
+	switch parts[0] {
+
+	case "ISUP":
+		if !(this.state == adcStateProtocol || this.state == adcStateNormal) {
+			this.malformed(parts)
+			return
+		}
+		for _, supportflag := range parts[1:] {
+			if len(supportflag) < 2 {
+				this.malformed(parts)
+				return
+			}
+
+			if supportflag[0:2] == "AD" {
+				this.supports[supportflag[2:]] = struct{}{}
+			} else if supportflag[0:2] == "RM" {
+				delete(this.supports, supportflag[2:])
+			} else {
+				this.malformed(parts)
+				return
+			}
+		}
+		if this.state == adcStateProtocol {
+			this.state = adcStateIdentify
+		}
+
+	case "ISID":
+		if this.state != adcStateIdentify {
+			this.malformed(parts)
+			return
+		}
+		this.sid = parts[1]
+
+	case "IINF":
+		flags := make(map[string]string)
+		for _, flag := range parts[1:] {
+			if len(flag) < 2 {
+				this.malformed(parts)
+				return
+			}
+			flags[flag[0:2]] = flag[2:]
+		}
+
+		// Possibilities: User MyINFO (Normal state), or, hub telling information about itself (Identify->Normal state)
+		if (this.state == adcStateIdentify || this.state == adcStateVerify) && flags["CT"] == "32" {
+			// Hub telling information about itself
+			this.handleInfo(flags)
+
+			// Transition to state VERIFY and send our own info
+			this.hc.SayRaw("BINF " + this.escape(this.sid) + " GARBAGE") // FIXME send a real info string
+			this.state = adcStateVerify
+
+		} else if this.state == adcStateNormal {
+			// OK
+			this.handleInfo(flags)
+
+		} else {
+			this.malformed(parts)
+			return
+		}
+
+	case "IGPA":
+		//
+
+	default:
+		this.malformed(parts)
+	}
+}
+
+func (this *AdcProtocol) handleInfo(flags map[string]string) {
+	if flags["CT"] == "32" {
+
+		// IINF DEADCH++\sTest\shub VE2.12.1\s(r"[unknown]")\sRelease HI1 NIADCH++ APADCH++ CT32
+		// AP: extension 3.24 "Application and version separation in INF"
+		// HI:
+
+		// Hub properties updated
+		hubName, ok := flags["DE"]
+		if ok {
+			this.hc.HubName = this.unescape(hubName)
+			this.hc.processEvent(HubEvent{EventType: EVENT_HUBNAME_CHANGED, Nick: this.hc.HubName})
+		}
+
+	} else {
+		// User MyINFO
+		// TODO
+
+	}
+}
+
+func (this *AdcProtocol) enterNormalState() {
+	this.state = adcStateNormal
+	this.hc.processEvent(HubEvent{EventType: EVENT_CONNECTION_STATE_CHANGED, StateChange: CONNECTIONSTATE_CONNECTED})
+	this.hc.State = CONNECTIONSTATE_CONNECTED
+}
+
+func (this *AdcProtocol) malformed(parts []string) {
+	this.hc.processEvent(HubEvent{EventType: EVENT_DEBUG_MESSAGE, Message: "Ignoring malformed, unhandled, or out-of-state protocol command '" + parts[0] + "'"})
+}
+
+func (this *AdcProtocol) escape(plaintext string) string {
+	// The string "\s" escapes space, "\n" newline and "\\" backslash. This version of the protocol reserves all other escapes for future use; any message containing unknown escapes must be discarded.
+	v1 := strings.Replace(plaintext, `\`, `\\`, -1)
+	v2 := strings.Replace(v1, "\n", `\n`, -1)
+	return strings.Replace(v2, " ", `\s`, -1)
+}
+
+func (this *AdcProtocol) unescape(encoded string) string {
+	v1 := strings.Replace(encoded, `\s`, " ", -1)
+	v2 := strings.Replace(v1, `\n`, "\n", -1)
+	return strings.Replace(v2, `\\`, `\`, -1)
 }
 
 func (this *AdcProtocol) SayPublic(msg string) {