Add possibility to reseed from HTTPS URL

Config.cpp

@@ -163,7 +163,7 @@ namespace config {
 	reseed.add_options()
 	  ("reseed.verify", value<bool>()->default_value(false), "Verify .su3 signature")
 		("reseed.floodfill", value<std::string>()->default_value(""), "Path to router info of floodfill to reseed from")
-	  ("reseed.file", value<std::string>()->default_value(""),  "Path to .su3 file")
+	  ("reseed.file", value<std::string>()->default_value(""),  "Path to local .su3 file or HTTPS URL to reseed from")
 	  ("reseed.urls", value<std::string>()->default_value(
 		"https://reseed.i2p-projekt.de/,"
 		"https://i2p.mooo.com/netDb/,"

Reseed.cpp

@@ -41,19 +41,23 @@ namespace data
 		std::string filename; i2p::config::GetOption("reseed.file", filename);
 		if (filename.length() > 0) // reseed file is specified
 		{
+                    if (filename.length() > 8 && filename.substr(0, 8) == "https://")
+                    {
+                        return ReseedFromSU3 (filename); // reseed from https URL 
+                    } else {
 			auto num = ProcessSU3File (filename.c_str ());
 			if (num > 0) return num; // success
 			LogPrint (eLogWarning, "Can't reseed from ", filename, " . Trying from hosts"); 
+                    }
 		}	
 		auto ind = rand () % httpsReseedHostList.size ();
-		std::string& reseedHost = httpsReseedHostList[ind];
-		return ReseedFromSU3 (reseedHost);
+		std::string reseedUrl = httpsReseedHostList[ind] + "i2pseeds.su3";
+		return ReseedFromSU3 (reseedUrl);
 	}
 
-	int Reseeder::ReseedFromSU3 (const std::string& host)
+	int Reseeder::ReseedFromSU3 (const std::string& url)
 	{
-		std::string url = host + "i2pseeds.su3";
-		LogPrint (eLogInfo, "Reseed: Downloading SU3 from ", host);
+		LogPrint (eLogInfo, "Reseed: Downloading SU3 from ", url);
 		std::string su3 = HttpsRequest (url);
 		if (su3.length () > 0)
 		{

Reseed.h

@@ -29,7 +29,7 @@ namespace data
 
 			void LoadCertificate (const std::string& filename);
 						
-			int ReseedFromSU3 (const std::string& host);
+			int ReseedFromSU3 (const std::string& url);
 			int ProcessSU3File (const char * filename);	
 			int ProcessSU3Stream (std::istream& s);	
 

docs/i2pd.conf

@@ -97,8 +97,10 @@ verify = true
 ## URLs to request reseed data from, separated by comma
 ## Default: "mainline" I2P Network reseeds
 # urls = https://reseed.i2p-projekt.de/,https://i2p.mooo.com/netDb/,https://netdb.i2p2.no/
-## Path to reseed data file (.su3) for manual reseeding 
+## Path to local reseed data file (.su3) for manual reseeding 
 # file = /path/to/i2pseeds.su3
+## or HTTPS URL to reseed from
+# file = https://legit-website.com/i2pseeds.su3
 
 [addressbook]
 ## AddressBook subscription URL for initial setup