Add device agent library

Provide enrollment, elevated install, posture checks, keystore, and
system-tray helpers shared by the probo-agent binary.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/deviceagent/server_url.go

@@ -0,0 +1,79 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package deviceagent
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+const (
+	USConsoleHost = "us.probo.com"
+	EUConsoleHost = "eu.probo.com"
+)
+
+const (
+	USConsoleURL = "https://" + USConsoleHost
+	EUConsoleURL = "https://" + EUConsoleHost
+)
+
+const DefaultServerURL = USConsoleURL
+
+func NormalizeServerURL(host string) (string, error) {
+	raw := strings.TrimSpace(host)
+	if raw == "" {
+		return "", errors.New("server URL is required")
+	}
+
+	if !strings.Contains(raw, "://") {
+		raw = "https://" + raw
+	}
+
+	parsed, err := url.Parse(raw)
+	if err != nil {
+		return "", fmt.Errorf("cannot parse server URL: %w", err)
+	}
+
+	scheme := strings.ToLower(parsed.Scheme)
+	if scheme != "https" && scheme != "http" {
+		return "", fmt.Errorf("unsupported server URL scheme %q", parsed.Scheme)
+	}
+
+	if parsed.Hostname() == "" {
+		return "", errors.New("server URL must include a hostname")
+	}
+
+	if parsed.User != nil {
+		return "", errors.New("server URL must not include user credentials")
+	}
+
+	if parsed.Path != "" && parsed.Path != "/" {
+		return "", errors.New("server URL must not include a path")
+	}
+
+	if parsed.RawQuery != "" || parsed.Fragment != "" {
+		return "", errors.New("server URL must not include query parameters or fragments")
+	}
+
+	return (&url.URL{Scheme: scheme, Host: strings.ToLower(parsed.Host)}).String(), nil
+}