lokinet/llarp/router_id.cpp

#include "router_id.hpp"

#include <oxenc/base32z.h>

namespace llarp
{
    constexpr std::string_view SNODE_TLD = ".snode";

    std::string RouterID::to_string() const
    {
        std::string b32 = oxenc::to_base32z(begin(), end());
        b32 += SNODE_TLD;
        return b32;
    }

    std::string RouterID::ShortString() const
    {
        // 5 bytes produces exactly 8 base32z characters:
        return oxenc::to_base32z(begin(), begin() + 5);
    }

    StatusObject RouterID::ExtractStatus() const
    {
        StatusObject obj{{"snode", to_string()}, {"hex", ToHex()}};
        return obj;
    }

    bool RouterID::from_snode_address(std::string_view str)
    {
        auto pos = str.find(SNODE_TLD);
        if (pos != str.size() - SNODE_TLD.size())
            return false;
        str.remove_suffix(SNODE_TLD.size());
        // Ensure we have something valid:
        // - must end in a 1-bit value: 'o' or 'y' (i.e. 10000 or 00000)
        // - must have 51 preceeding base32z chars
        // - thus we get 51*5+1 = 256 bits = 32 bytes of output
        if (str.size() != 52 || !oxenc::is_base32z(str) || !(str.back() == 'o' || str.back() == 'y'))
            return false;
        oxenc::from_base32z(str.begin(), str.end(), begin());
        return true;
    }
}  // namespace llarp