添加kBroadcastHttpBeforeAccess事件，拦截http文件下载事件

ZLToolKit @ e1b29b7f

-Subproject commit 2a7381ff6dbe5a2f419957734425d5423f3850c6
+Subproject commit e1b29b7fa22e18bb0976a281268c0431a411e7ce

src/Common/config.cpp

@@ -68,6 +68,7 @@ const string kBroadcastReloadConfig = "kBroadcastReloadConfig";
 const string kBroadcastShellLogin = "kBroadcastShellLogin";
 const string kBroadcastNotFoundStream = "kBroadcastNotFoundStream";
 const string kBroadcastStreamNoneReader = "kBroadcastStreamNoneReader";
+const string kBroadcastHttpBeforeAccess = "kBroadcastHttpBeforeAccess";
 } //namespace Broadcast
 
 //通用配置项目

src/Common/config.h

@@ -83,10 +83,15 @@ extern const string kBroadcastRecordMP4;
 extern const string kBroadcastHttpRequest;
 #define BroadcastHttpRequestArgs const Parser &parser,const HttpSession::HttpResponseInvoker &invoker,bool &consumed,TcpSession &sender
 
-//收到http 访问文件或目录的广播，通过该事件控制访问http目录的权限
+//在http文件服务器中,收到http访问文件或目录的广播,通过该事件控制访问http目录的权限
 extern const string kBroadcastHttpAccess;
 #define BroadcastHttpAccessArgs const Parser &parser,const MediaInfo &args,const string &path,const bool &is_dir,const HttpSession::HttpAccessPathInvoker &invoker,TcpSession &sender
 
+//在http文件服务器中,收到http访问文件或目录前的广播,通过该事件可以控制http url到文件路径的映射
+//在该事件中通过自行覆盖path参数，可以做到譬如根据虚拟主机或者app选择不同http根目录的目的
+extern const string kBroadcastHttpBeforeAccess;
+#define BroadcastHttpBeforeAccessArgs const Parser &parser,const MediaInfo &args,string &path,TcpSession &sender
+
 //该流是否需要认证？是的话调用invoker并传入realm,否则传入空的realm.如果该事件不监听则不认证
 extern const string kBroadcastOnGetRtspRealm;
 #define BroadcastOnGetRtspRealmArgs const MediaInfo &args,const RtspSession::onGetRealm &invoker,TcpSession &sender

src/Http/HttpFileManager.cpp

@@ -375,6 +375,14 @@ static void accessFile(TcpSession &sender, const Parser &parser, const MediaInfo
     });
 }
 
+static string getFilePath(const Parser &parser,const MediaInfo &mediaInfo, TcpSession &sender){
+    GET_CONFIG(bool, enableVhost, General::kEnableVhost);
+    GET_CONFIG(string, rootPath, Http::kRootPath);
+    auto ret = File::absolutePath(enableVhost ? mediaInfo._vhost + parser.Url() : parser.Url(), rootPath);
+    NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastHttpBeforeAccess, parser, mediaInfo, ret, sender);
+    return std::move(ret);
+}
+
 /**
  * 访问文件或文件夹
  * @param sender 事件触发者
@@ -384,11 +392,7 @@ static void accessFile(TcpSession &sender, const Parser &parser, const MediaInfo
 void HttpFileManager::onAccessPath(TcpSession &sender, Parser &parser, const HttpFileManager::invoker &cb) {
     auto fullUrl = string(HTTP_SCHEMA) + "://" + parser["Host"] + parser.FullUrl();
     MediaInfo mediaInfo(fullUrl);
-
-    GET_CONFIG(bool, enableVhost, General::kEnableVhost);
-    GET_CONFIG(string, rootPath, Http::kRootPath);
-    auto strFile = File::absolutePath(enableVhost ? mediaInfo._vhost + parser.Url() : parser.Url(), rootPath);
-
+    auto strFile = getFilePath(parser, mediaInfo, sender);
     //访问的是文件夹
     if (File::is_dir(strFile.data())) {
         auto indexFile = searchIndexFile(strFile);