feat(all): split client tooling and add OAuth server login

go/internal/client/config/release.go

@@ -0,0 +1,70 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+const ReleaseFileName = "versions.json"
+
+var (
+	clientVersionPattern   = regexp.MustCompile(`^[0-9]+\.[0-9]+\.[0-9]+$`)
+	resourceVersionPattern = regexp.MustCompile(`^[0-9]{14}$`)
+)
+
+// ReleaseVersions is the exact client/resource tuple supported by one
+// bd2client distribution. The release package carries the authoritative
+// versions.json next to bd2client.exe.
+type ReleaseVersions struct {
+	ClientVersion   string `json:"client_version"`
+	GameDataVersion string `json:"game_data_version"`
+	BundleVersion   string `json:"bundle_version"`
+	SeedDirectory   string `json:"seed_directory"`
+	Plugins         struct {
+		LocalIdentity      string `json:"local_identity"`
+		CaptureEnvironment string `json:"capture_environment"`
+		LoginUI            string `json:"login_ui"`
+	} `json:"plugins"`
+}
+
+func LoadReleaseVersions(path string) (ReleaseVersions, error) {
+	data, err := os.ReadFile(filepath.Clean(path))
+	if err != nil {
+		return ReleaseVersions{}, fmt.Errorf("read client release versions: %w", err)
+	}
+	decoder := json.NewDecoder(strings.NewReader(string(data)))
+	decoder.DisallowUnknownFields()
+	var versions ReleaseVersions
+	if err := decoder.Decode(&versions); err != nil {
+		return ReleaseVersions{}, fmt.Errorf("decode client release versions: %w", err)
+	}
+	var trailing any
+	if err := decoder.Decode(&trailing); !errors.Is(err, io.EOF) {
+		return ReleaseVersions{}, errors.New("client release versions must contain exactly one JSON object")
+	}
+	if !clientVersionPattern.MatchString(versions.ClientVersion) {
+		return ReleaseVersions{}, fmt.Errorf("invalid client_version %q", versions.ClientVersion)
+	}
+	if !resourceVersionPattern.MatchString(versions.BundleVersion) || !resourceVersionPattern.MatchString(versions.GameDataVersion) {
+		return ReleaseVersions{}, errors.New("bundle_version and game_data_version must be 14-digit timestamps")
+	}
+	if versions.SeedDirectory == "" ||
+		versions.Plugins.LocalIdentity == "" || versions.Plugins.LoginUI == "" || versions.Plugins.CaptureEnvironment == "" {
+		return ReleaseVersions{}, errors.New("client release versions are incomplete")
+	}
+	return versions, nil
+}
+
+func ReleaseVersionsBesideExecutable() (ReleaseVersions, error) {
+	executable, err := os.Executable()
+	if err != nil {
+		return ReleaseVersions{}, fmt.Errorf("locate bd2client executable: %w", err)
+	}
+	return LoadReleaseVersions(filepath.Join(filepath.Dir(executable), ReleaseFileName))
+}