experimental RPC to shorten URLs and decoded shortened twister URI to the original URL

src/bitcoinrpc.cpp

@@ -288,6 +288,8 @@ static const CRPCCommand vRPCCommands[] =
     { "peekpost",               &peekpost,               false,     true,       true },
     { "usernametouid",          &usernametouid,          false,     true,       true },
     { "uidtousername",          &uidtousername,          false,     true,       true },
+    { "newshorturl",            &newshorturl,            false,     true,       false },
+    { "decodeshorturl",         &decodeshorturl,         false,     true,       true },
 };
 
 CRPCTable::CRPCTable()
@@ -1372,6 +1374,8 @@ Array RPCConvertValues(const std::string &strMethod, const std::vector<std::stri
     if (strMethod == "peekpost"               && n > 3) ConvertTo<boost::int64_t>(params[3]);
     if (strMethod == "uidtousername"          && n > 0) ConvertTo<boost::int64_t>(params[0]);
     if (strMethod == "usernametouid"          && n > 1) ConvertTo<bool>(params[1]);;
+    if (strMethod == "newshorturl"            && n > 1) ConvertTo<boost::int64_t>(params[1]);;
+    if (strMethod == "decodeshorturl"         && n > 1) ConvertTo<boost::int64_t>(params[1]);;
 
     return params;
 }

src/bitcoinrpc.h

@@ -240,5 +240,7 @@ extern json_spirit::Value getpiecemaxseen(const json_spirit::Array& params, bool
 extern json_spirit::Value peekpost(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value uidtousername(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value usernametouid(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value newshorturl(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value decodeshorturl(const json_spirit::Array& params, bool fHelp);
 
 #endif

src/twister.cpp

@@ -4283,3 +4283,92 @@ Value usernametouid(const Array& params, bool fHelp)
 
     return Value(uid);
 }
+
+Value newshorturl(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 3)
+        throw runtime_error(
+            "newshorturl <username> <k> <url>\n"
+            "Shorten URL, create a post containing it add to swarm.\n"
+            "Returns the shortened twister URI (multiple options may be returned)");
+
+    EnsureWalletIsUnlocked();
+
+    string strUsername = params[0].get_str();
+    int k              = params[1].get_int();
+    string strUrl      = params[2].get_str();
+
+    Array paramsSub;
+    Value res;
+
+    paramsSub.clear();
+    paramsSub.push_back(strUsername);
+    paramsSub.push_back(k);
+    Object fields;
+    fields.push_back(Pair("url",strUrl));
+    paramsSub.push_back(fields);
+    res = newpostcustom(paramsSub,false);
+
+    paramsSub.clear();
+    paramsSub.push_back(strUsername);
+    res = usernametouid(paramsSub, false);
+
+    vector<unsigned char> vch;
+    vch.resize(8);
+    le32enc(&vch[0], res.get_int());
+    le32enc(&vch[4], k);
+    
+    string uid_k_64 = EncodeBase64(&vch[0], vch.size());
+    
+    Array uriOptions;
+    uriOptions.push_back(string("twist:")+uid_k_64);
+    
+    return uriOptions;
+}
+
+Value decodeshorturl(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 2 )
+        throw runtime_error(
+            "decodeshorturl <twist:xxx> [timeout_sec=90]\n"
+            "Decodes a shortened URL by twister. May take some time to complete, like dhtget etc.\n"
+            "Returns the original URL or error if not found, timeout");
+
+    string strTwistURI = params[0].get_str();
+    int timeout = 0;
+    if( params.size() > 1 )
+        timeout = params[1].get_int();
+
+    string protocol("twist:");
+    if (strTwistURI.find(protocol) != 0) {
+        throw JSONRPCError(RPC_PARSE_ERROR, "protocol prefix error");
+    }
+    string uid_k_64 = strTwistURI.substr(protocol.size());
+    if (uid_k_64.length() < 12) {
+        throw JSONRPCError(RPC_PARSE_ERROR, "base64 string too small");
+    }
+    
+    string vch = DecodeBase64(uid_k_64);
+    int uid = le32dec(&vch[0]);
+    int k = le32dec(&vch[4]);
+
+    Array paramsSub;
+    Value res;
+
+    paramsSub.clear();
+    paramsSub.push_back(uid);
+    res = uidtousername(paramsSub, false);
+    
+    string strUsername = res.get_str();
+    
+    paramsSub.clear();
+    paramsSub.push_back(strUsername);
+    paramsSub.push_back(k);
+    paramsSub.push_back("url");
+    if(timeout) {
+        paramsSub.push_back(timeout);
+    }
+    return peekpost(paramsSub,false);
+}
+
+