From dee7d8f00b4a119090256bd000dad01a393c866a Mon Sep 17 00:00:00 2001
From: Nikita Poltorapavlo <Nikita_Poltorapavlo2@cable.comcast.com>
Date: Thu, 3 Dec 2020 17:48:36 +0200
Subject: [PATCH] parse server.document-root

---
 UsbAccess/UsbAccess.cpp | 66 +++++++++++++++++++++++++++++++++++++----
 UsbAccess/UsbAccess.h   |  4 ++-
 2 files changed, 64 insertions(+), 6 deletions(-)

diff --git a/UsbAccess/UsbAccess.cpp b/UsbAccess/UsbAccess.cpp
index 8abf1d188d..5fb7db3270 100644
--- a/UsbAccess/UsbAccess.cpp
+++ b/UsbAccess/UsbAccess.cpp
@@ -12,8 +12,8 @@ const string WPEFramework::Plugin::UsbAccess::METHOD_GET_FILE_LIST = "getFileLis
 const string WPEFramework::Plugin::UsbAccess::METHOD_CREATE_LINK = "createLink";
 const string WPEFramework::Plugin::UsbAccess::METHOD_CLEAR_LINK = "clearLink";
 const string WPEFramework::Plugin::UsbAccess::USB_MOUNT_PATH = "/run/media/sda"; // platco
-const string WPEFramework::Plugin::UsbAccess::LINK_PATH = "/opt/www/usbdrive";
 const string WPEFramework::Plugin::UsbAccess::LINK_URL_HTTP = "http://localhost:50050/usbdrive";
+const string WPEFramework::Plugin::UsbAccess::LIGHTTPD_CONF_PATH = "/etc/lighttpd/lighttpd.conf";
 
 using namespace std;
 
@@ -126,11 +126,12 @@ namespace WPEFramework {
             LOGINFOMETHOD();
 
             bool success = false;
-            int rc = symlink(USB_MOUNT_PATH.c_str(), LINK_PATH.c_str());
+            string linkPath = getLinkPath();
+            int rc = symlink(USB_MOUNT_PATH.c_str(), linkPath.c_str());
 
             if (0 == rc)
             {
-                LOGINFO("symlink %s created", LINK_PATH.c_str());
+                LOGINFO("symlink %s created", linkPath.c_str());
                 response["baseURL"] = LINK_URL_HTTP;
                 success = true;
             }
@@ -148,11 +149,12 @@ namespace WPEFramework {
             LOGINFOMETHOD();
 
             bool success = false;
-            int rc = remove(LINK_PATH.c_str());
+            string linkPath = getLinkPath();
+            int rc = remove(linkPath.c_str());
 
             if (0 == rc)
             {
-                LOGINFO("symlink %s removed", LINK_PATH.c_str());
+                LOGINFO("symlink %s removed", linkPath.c_str());
                 success = true;
             }
             else
@@ -163,5 +165,59 @@ namespace WPEFramework {
 
             returnResponse(success);
         }
+
+        string UsbAccess::getLinkPath() const
+        {
+            static string path;
+
+            static bool initedOnce = false;
+            if (!initedOnce)
+            {
+                FILE* f = fopen(LIGHTTPD_CONF_PATH.c_str(), "r");
+                if (f != nullptr)
+                {
+                    std::vector<char> buf;
+                    buf.resize(1024);
+
+                    while (fgets(buf.data(), buf.size(), f))
+                    {
+                        if (strstr(buf.data(), "server.document-root") == buf.data())
+                        {
+                            std::string s(buf.data());
+
+                            size_t begin = s.find_first_of('"');
+                            size_t end = std::string::npos;
+                            if (std::string::npos != begin)
+                                end = s.find_first_of('"', begin + 2);
+
+                            if (std::string::npos != begin && std::string::npos != end)
+                            {
+                                path = s.substr(begin + 1, end - begin - 1);
+                                break;
+                            }
+                            else
+                                LOGERR("Failed to parse line: ", s.c_str());
+                        }
+                    }
+                    fclose(f);
+
+                    if (path.empty())
+                        LOGERR("Failed to parse conf %s", LIGHTTPD_CONF_PATH.c_str());
+                    else
+                    {
+                        if (path[path.size() - 1] != '/')
+                            path += "/";
+                        path += "usbdrive";
+                        LOGINFO("Link path is: %s", path.c_str());
+                    }
+                }
+                else
+                    LOGERR("Failed to open conf %s:%s", LIGHTTPD_CONF_PATH.c_str(), strerror(errno));
+
+                initedOnce = true;
+            }
+
+            return path;
+        }
     } // namespace Plugin
 } // namespace WPEFramework
diff --git a/UsbAccess/UsbAccess.h b/UsbAccess/UsbAccess.h
index 4e5a355fb4..af60777417 100644
--- a/UsbAccess/UsbAccess.h
+++ b/UsbAccess/UsbAccess.h
@@ -30,8 +30,8 @@ namespace WPEFramework {
             //events
             //other
             static const string USB_MOUNT_PATH;
-            static const string LINK_PATH;
             static const string LINK_URL_HTTP;
+            static const string LIGHTTPD_CONF_PATH;
 
         private/*registered methods (wrappers)*/:
 
@@ -43,6 +43,8 @@ namespace WPEFramework {
         private/*internal methods*/:
             UsbAccess(const UsbAccess&) = delete;
             UsbAccess& operator=(const UsbAccess&) = delete;
+
+            string getLinkPath() const;
         };
     } // namespace Plugin
 } // namespace WPEFramework