init: 初始化 web_hgdjb_server 项目

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

pub/models/cfg/appkey.go

@@ -0,0 +1,42 @@
+package cfg
+
+import (
+	"context"
+	"strings"
+	"sync"
+
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+var appKeyCache struct {
+	sync.RWMutex
+	value string
+	ready bool
+}
+
+// CacheAppKey 把系统配置里的 appKey 放进内存，供媒资写接口读取。
+func CacheAppKey(appKey string) {
+	appKeyCache.Lock()
+	appKeyCache.value = strings.TrimSpace(appKey)
+	appKeyCache.ready = true
+	appKeyCache.Unlock()
+}
+
+// CachedAppKey 返回已缓存的 appKey。缓存未建立时读取 sys_cfg 并写入缓存。
+func CachedAppKey(ctx context.Context) string {
+	appKeyCache.RLock()
+	if appKeyCache.ready {
+		value := appKeyCache.value
+		appKeyCache.RUnlock()
+		return value
+	}
+	appKeyCache.RUnlock()
+
+	sysCfg, serr := FindOneSysCfg(ctx, bson.M{FN.SysCfg.Id: 1})
+	if serr != nil || sysCfg == nil {
+		return ""
+	}
+	value := strings.TrimSpace(sysCfg.AppKey)
+	CacheAppKey(value)
+	return value
+}