rpc: Push down safe mode checks

This contains most of the changes of 10563 "remove safe mode", but doesn't
remove the safe mode yet, but put an `ObserveSafeMode()` check in
individual calls with okSafeMode=false.

This cleans up the ugly "okSafeMode" flag from the dispatch tables,
which is not a concern for the RPC server.

Extra-author: Wladimir J. van der Laan <laanwj@gmail.com>

src/init.cpp

@@ -30,6 +30,7 @@
 #include "policy/policy.h"
 #include "rpc/server.h"
 #include "rpc/register.h"
+#include "rpc/safemode.h"
 #include "rpc/blockchain.h"
 #include "script/standard.h"
 #include "script/sigcache.h"
@@ -70,7 +71,6 @@
 bool fFeeEstimatesInitialized = false;
 static const bool DEFAULT_PROXYRANDOMIZE = true;
 static const bool DEFAULT_REST_ENABLE = false;
-static const bool DEFAULT_DISABLE_SAFEMODE = true;
 static const bool DEFAULT_STOPAFTERBLOCKIMPORT = false;
 
 std::unique_ptr<CConnman> g_connman;
@@ -318,15 +318,6 @@ void OnRPCStopped()
     LogPrint(BCLog::RPC, "RPC stopped.\n");
 }
 
-void OnRPCPreCommand(const CRPCCommand& cmd)
-{
-    // Observe safe mode
-    std::string strWarning = GetWarnings("rpc");
-    if (strWarning != "" && !gArgs.GetBoolArg("-disablesafemode", DEFAULT_DISABLE_SAFEMODE) &&
-        !cmd.okSafeMode)
-        throw JSONRPCError(RPC_FORBIDDEN_BY_SAFE_MODE, std::string("Safe mode: ") + strWarning);
-}
-
 std::string HelpMessage(HelpMessageMode mode)
 {
     const auto defaultBaseParams = CreateBaseChainParams(CBaseChainParams::MAIN);
@@ -721,7 +712,6 @@ bool AppInitServers(boost::thread_group& threadGroup)
 {
     RPCServer::OnStarted(&OnRPCStarted);
     RPCServer::OnStopped(&OnRPCStopped);
-    RPCServer::OnPreCommand(&OnRPCPreCommand);
     if (!InitHTTPServer())
         return false;
     if (!StartRPC())