business: fix contact projection and phone sharing

(cherry picked from commit c0a0e5b52240ed415d3b43ba77659821887bf50b)

internal/rpc/convert_test.go

@@ -0,0 +1,31 @@
+package rpc
+
+import (
+	"testing"
+
+	"github.com/gotd/td/tg"
+
+	"telesrv/internal/domain"
+)
+
+func TestTGMessagesMessagesMarksViewerSelfAndKeepsProjectedPhone(t *testing.T) {
+	const viewerID int64 = 1001
+	res := tgMessagesMessages(viewerID, domain.MessageList{
+		Users: []domain.User{
+			{ID: viewerID, AccessHash: 11, Phone: "15550000001", FirstName: "Owner"},
+			{ID: 1002, AccessHash: 22, Phone: "", FirstName: "Peer"},
+		},
+	})
+	full, ok := res.(*tg.MessagesMessages)
+	if !ok {
+		t.Fatalf("result = %T, want *tg.MessagesMessages", res)
+	}
+	self, ok := full.Users[0].(*tg.User)
+	if !ok || !self.Self || self.Phone != "15550000001" {
+		t.Fatalf("self user = %+v ok=%v, want self with phone", full.Users[0], ok)
+	}
+	peer, ok := full.Users[1].(*tg.User)
+	if !ok || peer.Self || peer.Phone != "" || peer.FirstName != "Peer" {
+		t.Fatalf("peer user = %+v ok=%v, want projected non-self without phone", full.Users[1], ok)
+	}
+}