mirror of https://github.com/oxen-io/lokinet
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90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
#include "address.hpp"
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#include <llarp/crypto/crypto.hpp>
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#include <oxenc/base32z.h>
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#include <algorithm>
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namespace llarp::service
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{
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const std::set<std::string> Address::AllowedTLDs = {".loki", ".snode"};
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bool
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Address::PermitTLD(const char* tld)
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{
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std::string gtld(tld);
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std::transform(gtld.begin(), gtld.end(), gtld.begin(), ::tolower);
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return AllowedTLDs.count(gtld) != 0;
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}
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std::string
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Address::ToString(const char* tld) const
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{
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if (!PermitTLD(tld))
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return "";
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std::string str;
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if (subdomain.size())
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{
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str = subdomain;
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str += '.';
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}
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str += oxenc::to_base32z(begin(), end());
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str += tld;
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return str;
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}
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bool
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Address::FromString(std::string_view str, const char* tld)
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{
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if (!PermitTLD(tld))
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return false;
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// Find, validate, and remove the .tld
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const auto pos = str.find_last_of('.');
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if (pos == std::string::npos)
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return false;
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if (str.substr(pos) != tld)
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return false;
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str = str.substr(0, pos);
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// copy subdomains if they are there (and strip them off)
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const auto idx = str.find_last_of('.');
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if (idx != std::string::npos)
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{
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subdomain = str.substr(0, idx);
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str.remove_prefix(idx + 1);
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}
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// Ensure we have something valid:
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// - must end in a 1-bit value: 'o' or 'y' (i.e. 10000 or 00000)
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// - must have 51 preceeding base32z chars
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// - thus we get 51*5+1 = 256 bits = 32 bytes of output
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if (str.size() != 52 || !oxenc::is_base32z(str) || !(str.back() == 'o' || str.back() == 'y'))
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return false;
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oxenc::from_base32z(str.begin(), str.end(), begin());
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return true;
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}
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dht::Key_t
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Address::ToKey() const
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{
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PubKey k;
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crypto::derive_subkey(k, PubKey(data()), 1);
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return dht::Key_t{k.as_array()};
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}
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std::optional<std::variant<Address, RouterID>>
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parse_address(std::string_view lokinet_addr)
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{
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RouterID router{};
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service::Address addr{};
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if (router.from_string(lokinet_addr))
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return router;
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if (addr.FromString(lokinet_addr))
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return addr;
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return std::nullopt;
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}
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} // namespace llarp::service
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