feat: Phase 4 多平台接入 — Platform Bridge + 6平台适配器 + 身份权限系统 (22文件, 2129行)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/platform-bridge/internal/bridge/mapper.go

@@ -0,0 +1,73 @@
+package bridge
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/yourname/cyrene-ai/platform-bridge/internal/permissions"
+)
+
+// IdentityMapper maps platform identities to Cyrene users.
+type IdentityMapper struct {
+	mu          sync.RWMutex
+	byPlatform  map[string]map[string]*permissions.PlatformIdentity // platform -> platformUID -> identity
+}
+
+func NewIdentityMapper() *IdentityMapper {
+	return &IdentityMapper{
+		byPlatform: make(map[string]map[string]*permissions.PlatformIdentity),
+	}
+}
+
+// Register adds or updates a platform identity mapping.
+func (m *IdentityMapper) Register(id permissions.PlatformIdentity) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.byPlatform[id.Platform] == nil {
+		m.byPlatform[id.Platform] = make(map[string]*permissions.PlatformIdentity)
+	}
+	m.byPlatform[id.Platform][id.PlatformUID] = &id
+}
+
+// Resolve finds the Cyrene user for a platform identity.
+func (m *IdentityMapper) Resolve(platform, platformUID string) (*permissions.PlatformIdentity, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	plat, ok := m.byPlatform[platform]
+	if !ok {
+		return nil, fmt.Errorf("unknown platform: %s", platform)
+	}
+	id, ok := plat[platformUID]
+	if !ok {
+		return nil, fmt.Errorf("unknown user on %s: %s", platform, platformUID)
+	}
+	return id, nil
+}
+
+// List returns all identities for a platform.
+func (m *IdentityMapper) List(platform string) []permissions.PlatformIdentity {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	plat, ok := m.byPlatform[platform]
+	if !ok {
+		return nil
+	}
+	result := make([]permissions.PlatformIdentity, 0, len(plat))
+	for _, id := range plat {
+		result = append(result, *id)
+	}
+	return result
+}
+
+// ListAll returns all registered identities.
+func (m *IdentityMapper) ListAll() map[string][]permissions.PlatformIdentity {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	result := make(map[string][]permissions.PlatformIdentity)
+	for plat, users := range m.byPlatform {
+		for _, id := range users {
+			result[plat] = append(result[plat], *id)
+		}
+	}
+	return result
+}