Using proxy for data and metadata then mirroring Copernicus files

sources/COPERNICUS.cpp

@@ -37,6 +37,13 @@ RetVal<std::vector<struct FileInfo>> COPERNICUSData::ReadRemoteFileList(const MS
  bool    next = true;
 
  CURLRAII chandle;
+ {
+  auto oldprefix = michlib::GPL.UsePrefix("COPERNICUS");
+  auto proxyurl  = michlib::GPL.ParameterSValue("Proxy", "");
+  if(proxyurl.Exist()) curl_easy_setopt(chandle, CURLOPT_PROXY, proxyurl.Buf());
+  michlib::GPL.UsePrefix(oldprefix);
+ }
+
  while(next)
  {
   MString url = bucket + "?list-type=2&prefix=" + prefix;
@@ -133,6 +140,11 @@ Error COPERNICUSData::Mirror(const CLArgs& args) const
  if(filter.Compile() != 0) return Error(pref, MString("Can't compile regular expression ") + filter.RegStr());
 
  CURLRAII chandle;
+ {
+  auto proxyurl = michlib::GPL.ParameterSValue("Proxy", "");
+  if(proxyurl.Exist()) curl_easy_setopt(chandle, CURLOPT_PROXY, proxyurl.Buf());
+ }
+
  for(const auto& dset: dsets)
  {
   michlib::message("Mirroring " + dset);