Implement br_static (#359)

config.example.json

@@ -193,6 +193,10 @@
         //file with the extension ".gz" in the same path and send the compressed file to the client.
         //The default value of gzip_static is true.
         "gzip_static": true,
+        //br_static: If it is set to true, when the client requests a static file, drogon first finds the compressed 
+        //file with the extension ".br" in the same path and send the compressed file to the client.
+        //The default value of br_static is true.
+        "br_static": true,
         //client_max_body_size: Set the maximum body size of HTTP requests received by drogon. The default value is "1M".
         //One can set it to "1024", "1k", "10M", "1G", etc. Setting it to "" means no limit.
         "client_max_body_size": "1M",

drogon_ctl/templates/config.csp

@@ -193,6 +193,10 @@
         //file with the extension ".gz" in the same path and send the compressed file to the client.
         //The default value of gzip_static is true.
         "gzip_static": true,
+        //br_static: If it is set to true, when the client requests a static file, drogon first finds the compressed 
+        //file with the extension ".br" in the same path and send the compressed file to the client.
+        //The default value of br_static is true.
+        "br_static": true,
         //client_max_body_size: Set the maximum body size of HTTP requests received by drogon. The default value is "1M".
         //One can set it to "1024", "1k", "10M", "1G", etc. Setting it to "" means no limit.
         "client_max_body_size": "1M",

lib/inc/drogon/HttpAppFramework.h

@@ -923,6 +923,17 @@ class HttpAppFramework : public trantor::NonCopyable
      */
     virtual HttpAppFramework &setGzipStatic(bool useGzipStatic) = 0;
 
+    /// Set the br_static option.
+    /**
+     * If it is set to true, when the client requests a static file, drogon
+     * first finds the compressed file with the extension ".br" in the same path
+     * and send the compressed file to the client. The default value is true.
+     *
+     * @note
+     * This operation can be performed by an option in the configuration file.
+     */
+    virtual HttpAppFramework &setBrStatic(bool useGzipStatic) = 0;
+
     /// Set the max body size of the requests received by drogon.
     /**
      * The default value is 1M.

lib/src/ConfigLoader.cc

@@ -369,6 +369,8 @@ static void loadApp(const Json::Value &app)
     drogon::app().setPipeliningRequestsNumber(pipeliningReqs);
     auto useGzipStatic = app.get("gzip_static", true).asBool();
     drogon::app().setGzipStatic(useGzipStatic);
+    auto useBrStatic = app.get("br_static", true).asBool();
+    drogon::app().setBrStatic(useBrStatic);
     auto maxBodySize = app.get("client_max_body_size", "1M").asString();
     size_t size;
     if (bytesSize(maxBodySize, size))

lib/src/HttpAppFrameworkImpl.cc

@@ -164,6 +164,11 @@ HttpAppFramework &HttpAppFrameworkImpl::setGzipStatic(bool useGzipStatic)
     staticFileRouterPtr_->setGzipStatic(useGzipStatic);
     return *this;
 }
+HttpAppFramework &HttpAppFrameworkImpl::setBrStatic(bool useGzipStatic)
+{
+    staticFileRouterPtr_->setBrStatic(useGzipStatic);
+    return *this;
+}
 #ifndef _WIN32
 HttpAppFramework &HttpAppFrameworkImpl::enableDynamicViewsLoading(
     const std::vector<std::string> &libPaths,

lib/src/HttpAppFrameworkImpl.h

@@ -274,6 +274,7 @@ class HttpAppFrameworkImpl : public HttpAppFramework
         return *this;
     }
     virtual HttpAppFramework &setGzipStatic(bool useGzipStatic) override;
+    virtual HttpAppFramework &setBrStatic(bool useGzipStatic) override;
     virtual HttpAppFramework &setClientMaxBodySize(size_t maxSize) override
     {
         clientMaxBodySize_ = maxSize;

lib/src/StaticFileRouter.cc

@@ -248,7 +248,22 @@ void StaticFileRouter::sendStaticFileResponse(
         return;
     }
     HttpResponsePtr resp;
-    if (gzipStaticFlag_ &&
+    if (brStaticFlag_ &&
+        req->getHeaderBy("accept-encoding").find("br") != std::string::npos)
+    {
+        // Find compressed file first.
+        auto gzipFileName = filePath + ".br";
+        std::ifstream infile(gzipFileName, std::ifstream::binary);
+        if (infile)
+        {
+            resp =
+                HttpResponse::newFileResponse(gzipFileName,
+                                              "",
+                                              drogon::getContentType(filePath));
+            resp->addHeader("Content-Encoding", "br");
+        }
+    }
+    if (!resp && gzipStaticFlag_ &&
         req->getHeaderBy("accept-encoding").find("gzip") != std::string::npos)
     {
         // Find compressed file first.
@@ -263,6 +278,7 @@ void StaticFileRouter::sendStaticFileResponse(
             resp->addHeader("Content-Encoding", "gzip");
         }
     }
+
     if (!resp)
         resp = HttpResponse::newFileResponse(filePath);
     if (resp->statusCode() != k404NotFound)

lib/src/StaticFileRouter.h

@@ -42,6 +42,10 @@ class StaticFileRouter
     {
         gzipStaticFlag_ = useGzipStatic;
     }
+    void setBrStatic(bool useBrStatic)
+    {
+        brStaticFlag_ = useBrStatic;
+    }
     void init(const std::vector<trantor::EventLoop *> &ioloops);
 
     void sendStaticFileResponse(
@@ -95,6 +99,7 @@ class StaticFileRouter
     int staticFilesCacheTime_{5};
     bool enableLastModify_{true};
     bool gzipStaticFlag_{true};
+    bool brStaticFlag_{true};
     std::unique_ptr<
         IOThreadStorage<std::unique_ptr<CacheMap<std::string, char>>>>
         staticFilesCacheMap_;