/*
* (C) 2009,2010,2014,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include "cli.h"

#include <botan/version.h>
#include <botan/auto_rng.h>
#include <botan/hash.h>
#include <botan/cpuid.h>
#include <botan/hex.h>

#if defined(BOTAN_HAS_BASE64_CODEC)
  #include <botan/base64.h>
#endif

#if defined(BOTAN_HAS_SYSTEM_RNG)
  #include <botan/system_rng.h>
#endif

#if defined(BOTAN_HAS_HTTP_UTIL)
  #include <botan/http_util.h>
#endif

#if defined(BOTAN_HAS_BCRYPT)
  #include <botan/bcrypt.h>
#endif

namespace Botan_CLI {

class Config_Info final : public Command
   {
   public:
      Config_Info() : Command("config info_type") {}

      std::string help_text() const override
         {
         return "Usage: config info_type\n"
                "   prefix: Print install prefix\n"
                "   cflags: Print include params\n"
                "   ldflags: Print linker params\n"
                "   libs: Print libraries\n";
         }

      void go() override
         {
         const std::string arg = get_arg("info_type");

         if(arg == "prefix")
            {
            output() << BOTAN_INSTALL_PREFIX << "\n";
            }
         else if(arg == "cflags")
            {
            output() << "-I" << BOTAN_INSTALL_PREFIX << "/" << BOTAN_INSTALL_HEADER_DIR << "\n";
            }
         else if(arg == "ldflags")
            {
            output() << "-L" << BOTAN_INSTALL_PREFIX << "/" << BOTAN_INSTALL_LIB_DIR << "\n";
            }
         else if(arg == "libs")
            {
            output() << "-lbotan-" << Botan::version_major() << "." << Botan::version_minor()
                     << " " << BOTAN_LIB_LINK << "\n";
            }
         else
            {
            throw CLI_Usage_Error("Unknown option to botan config " + arg);
            }
         }
   };

BOTAN_REGISTER_COMMAND("config", Config_Info);

class Version_Info final : public Command
   {
   public:
      Version_Info() : Command("version --full") {}

      void go() override
         {
         if(flag_set("full"))
            {
            output() << Botan::version_string() << "\n";
            }
         else
            {
            output() << Botan::version_major() << "."
                     << Botan::version_minor() << "."
                     << Botan::version_patch() << "\n";
            }
         }
   };

BOTAN_REGISTER_COMMAND("version", Version_Info);

class Print_Cpuid final : public Command
   {
   public:
      Print_Cpuid() : Command("cpuid") {}

      void go() override
         {
         Botan::CPUID::print(output());
         }
   };

BOTAN_REGISTER_COMMAND("cpuid", Print_Cpuid);

class Hash final : public Command
   {
   public:
      Hash() : Command("hash --algo=SHA-256 --buf-size=4096 *files") {}

      void go() override
         {
         const std::string hash_algo = get_arg("algo");
         std::unique_ptr<Botan::HashFunction> hash_fn(Botan::HashFunction::create(hash_algo));

         if(!hash_fn)
            throw CLI_Error_Unsupported("hashing", hash_algo);

         const size_t buf_size = get_arg_sz("buf-size");

         auto files = get_arg_list("files");
         if(files.empty())
            files.push_back("-"); // read stdin if no arguments on command line

         for(auto fsname : files)
            {
            try
               {
               auto update_hash = [&](const uint8_t b[], size_t l) { hash_fn->update(b, l); };
               read_file(fsname, update_hash, buf_size);
               output() << Botan::hex_encode(hash_fn->final()) << " " << fsname << "\n";
               }
            catch(CLI_IO_Error& e)
               {
               error_output() << e.what() << "\n";
               }
            }
         }
   };

BOTAN_REGISTER_COMMAND("hash", Hash);

class RNG final : public Command
   {
   public:
      RNG() : Command("rng --system *bytes") {}

      void go() override
         {
         std::unique_ptr<Botan::RNG> rng;

         if(flag_set("system"))
            {
#if defined(BOTAN_HAS_SYSTEM_RNG)
            rng.reset(new Botan::System_RNG);
#else
            error_output() << "system_rng disabled in build\n";
            return;
#endif
            }
         else
            {
            rng.reset(new Botan::AutoSeeded_RNG);
            }

         for(const std::string& req : get_arg_list("bytes"))
            {
            output() << Botan::hex_encode(rng->random_vec(Botan::to_u32bit(req))) << "\n";
            }
         }
   };

BOTAN_REGISTER_COMMAND("rng", RNG);

#if defined(BOTAN_HAS_HTTP_UTIL)

class HTTP_Get final : public Command
   {
   public:
      HTTP_Get() : Command("http_get url") {}

      void go() override
         {
         output() << Botan::HTTP::GET_sync(get_arg("url")) << "\n";
         }
   };

BOTAN_REGISTER_COMMAND("http_get", HTTP_Get);

#endif // http_util

#if defined(BOTAN_HAS_BASE64_CODEC)

class Base64_Encode final : public Command
   {
   public:
      Base64_Encode() : Command("base64_enc file") {}

      void go() override
         {
         this->read_file(get_arg("file"),
                         [&](const uint8_t b[], size_t l) { output() << Botan::base64_encode(b, l); },
                         768);
         }
   };

BOTAN_REGISTER_COMMAND("base64_enc", Base64_Encode);

class Base64_Decode final : public Command
   {
   public:
      Base64_Decode() : Command("base64_dec file") {}

      void go() override
         {
         auto write_bin = [&](const uint8_t b[], size_t l)
            {
            Botan::secure_vector<uint8_t> bin = Botan::base64_decode(reinterpret_cast<const char*>(b), l);
            output().write(reinterpret_cast<const char*>(bin.data()), bin.size());
            };

         this->read_file(get_arg("file"),
                         write_bin,
                         1024);
         }
   };

BOTAN_REGISTER_COMMAND("base64_dec", Base64_Decode);

#endif // base64

#if defined(BOTAN_HAS_BCRYPT)

class Generate_Bcrypt final : public Command
   {
   public:
      Generate_Bcrypt() : Command("gen_bcrypt --work-factor=12 password") {}

      void go() override
         {
         const std::string password = get_arg("password");
         const size_t wf = get_arg_sz("work_factor");

         output() << Botan::generate_bcrypt(password, rng(), wf) << "\n";
         }
   };

BOTAN_REGISTER_COMMAND("gen_bcrypt", Generate_Bcrypt);

class Check_Bcrypt final : public Command
   {
   public:
      Check_Bcrypt() : Command("check_bcrypt password hash") {}

      void go() override
         {
         const std::string password = get_arg("password");
         const std::string hash = get_arg("hash");

         if(hash.length() != 60)
            {
            error_output() << "Note: bcrypt '" << hash << "' has wrong length and cannot be valid\n";
            }

         const bool ok = Botan::check_bcrypt(password, hash);

         output() << "Password is " << (ok ? "valid" : "NOT valid") << std::endl;
         }
   };

BOTAN_REGISTER_COMMAND("check_bcrypt", Check_Bcrypt);

#endif // bcrypt

}