Minor improvements

- WebFinger:  detect when to use http or https, better function naming
- RequestPool: add user agent

source/util.d

@@ -3,6 +3,11 @@ module util;
 import std.format;
 import std.json;
 
+import slf4d;
+
+import deimos.openssl.rsa;
+import deimos.openssl.pem;
+
 void optional(T)(ref JSONValue val, string key, ref T receiver) {
   const(JSONValue)* p = key in val;
 
@@ -24,3 +29,18 @@ T optional(T)(ref JSONValue val, string key) {
 void required(T)(ref JSONValue val, string key, ref T receiver) {
   receiver = val[key].get!T;
 }
+
+void generateRSA() {
+  RSA* rsa = RSA_generate_key(2048, 3, null, null);
+  BIO* bio = BIO_new(BIO_s_mem());
+  PEM_write_bio_RSAPrivateKey(bio, rsa, null, null, 0, null, null);
+
+  int keyLen = BIO_pending(bio);
+  char[] pemKey = new char[keyLen + 1];
+  BIO_read(bio, pemKey.ptr, keyLen);
+
+  BIO_free_all(bio);
+  RSA_free(rsa);
+
+  infoF!"private key: %s"(pemKey);
+}