fix: only override device platform when set (#4) (thanks @zats)

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Start tracking changes for the next release (from 2026-01-23).
 - Send: `wacli send file --filename` to override display name for uploads. (#7 — thanks @plattenschieber)
+- Auth: allow optional `WACLI_DEVICE_LABEL` and `WACLI_DEVICE_PLATFORM` overrides for linked device identity. (#4 — thanks @zats)
 
 ### Fixed
 

cmd/wacli/main.go

@@ -2,10 +2,43 @@ package main
 
 import (
 	"os"
+	"strings"
+
+	"go.mau.fi/whatsmeow/proto/waCompanionReg"
+	"go.mau.fi/whatsmeow/store"
+	"google.golang.org/protobuf/proto"
 )
 
 func main() {
+	applyDeviceLabel()
 	if err := execute(os.Args[1:]); err != nil {
 		os.Exit(1)
 	}
 }
+
+func applyDeviceLabel() {
+	label := strings.TrimSpace(os.Getenv("WACLI_DEVICE_LABEL"))
+	platformRaw := strings.TrimSpace(os.Getenv("WACLI_DEVICE_PLATFORM"))
+	if platformRaw != "" {
+		platform := parsePlatformType(platformRaw)
+		store.DeviceProps.PlatformType = platform.Enum()
+	}
+	if label == "" {
+		return
+	}
+	store.SetOSInfo(label, [3]uint32{0, 1, 0})
+	store.BaseClientPayload.UserAgent.Device = proto.String(label)
+	store.BaseClientPayload.UserAgent.Manufacturer = proto.String(label)
+}
+
+func parsePlatformType(raw string) waCompanionReg.DeviceProps_PlatformType {
+	value := strings.TrimSpace(raw)
+	if value == "" {
+		return waCompanionReg.DeviceProps_CHROME
+	}
+	value = strings.ToUpper(value)
+	if enumValue, ok := waCompanionReg.DeviceProps_PlatformType_value[value]; ok {
+		return waCompanionReg.DeviceProps_PlatformType(enumValue)
+	}
+	return waCompanionReg.DeviceProps_CHROME
+}