From 2700ed6a3e1092a064f28b07f8e2c4e5b9b830e7 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 16 Nov 2015 20:02:06 +0200
Subject: Implement new URL path schema for the web interface

---
 brep/repository-root.cxx | 119 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 brep/repository-root.cxx

(limited to 'brep/repository-root.cxx')

diff --git a/brep/repository-root.cxx b/brep/repository-root.cxx
new file mode 100644
index 0000000..180d61f
--- /dev/null
+++ b/brep/repository-root.cxx
@@ -0,0 +1,119 @@
+// file      : brep/repository-root.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <brep/repository-root>
+
+#include <map>
+#include <functional>
+
+#include <web/module>
+
+#include <brep/types>
+#include <brep/utility>
+#include <brep/package-search>
+#include <brep/repository-details>
+
+using namespace std;
+
+namespace brep
+{
+  // request_proxy
+  //
+  class request_proxy: public request
+  {
+  public:
+    request_proxy (request& r, const name_values& p)
+        : request_ (r), parameters_ (p) {}
+
+    virtual const path_type&
+    path () {return request_.path ();}
+
+    virtual const name_values&
+    parameters () {return parameters_;}
+
+    virtual const name_values&
+    cookies () {return request_.cookies ();}
+
+    virtual istream&
+    content () {return request_.content ();}
+
+  private:
+    request& request_;
+    const name_values& parameters_;
+  };
+
+  // repository_root
+  //
+  void repository_root::
+  handle (request& rq, response& rs)
+  {
+    MODULE_DIAG;
+
+    // Dispatch request handling to the appropriate module depending on the
+    // function name passed as a first HTTP request parameter. The parameter
+    // should have no value specified. If no function name is passed,
+    // the default handler is selected. Example: cppget.org/?about
+    //
+
+    string func;
+    name_values params (rq.parameters ());
+
+    // Obtain the function name.
+    //
+    if (!params.empty () && !params.front ().value)
+    {
+      func = move (params.front ().name);
+
+      // Cleanup not to confuse the selected handler with the unknown parameter.
+      //
+      params.erase (params.begin ());
+    }
+
+    // To handle the request a new module instance is created as a copy of
+    // the corresponsing exemplar.
+    //
+    using module_ptr = unique_ptr<module>;
+
+    // Function name to module factory map.
+    //
+    const map<string, function<module_ptr()>>
+      handlers ({
+        {
+          "about",
+          [this]() -> module_ptr
+          {return module_ptr (new repository_details (repository_details_));}
+        },
+        {
+          string (), // The default handler.
+          [this]() -> module_ptr
+          {return module_ptr (new package_search (package_search_));}
+        }});
+
+    // Find proper handler.
+    //
+    auto i (handlers.find (func));
+    if (i == handlers.end ())
+      throw invalid_request (400, "unknown function");
+
+    module_ptr m (i->second ());
+    if (m->loaded ())
+    {
+      // Delegate request handling.
+      //
+      // @@ An exception thrown by the handler will be attributed to the
+      //    repository-root service while being logged. Could intercept
+      //    exception handling to fix that, but let's not complicate the
+      //    code for the time being.
+      //
+      //
+      request_proxy rqp (rq, params);
+      m->handle (rqp, rs);
+    }
+    else
+      // The module is not loaded, presumably being disabled in the web server
+      // configuration file.
+      //
+      throw invalid_request (404, "handler not available");
+  }
+}
-- 
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