Add CNetAddr::SetI2P()

src/netaddress.cpp

@@ -274,6 +274,34 @@ bool CNetAddr::SetSpecial(const std::string& str)
     return false;
 }
 
+bool CNetAddr::SetI2P(const std::string& addr)
+{
+    // I2P addresses that we support consist of 52 base32 characters + ".b32.i2p".
+    static constexpr size_t b32_len{52};
+    static const char* suffix{".b32.i2p"};
+    static constexpr size_t suffix_len{8};
+
+    if (addr.size() != b32_len + suffix_len || ToLower(addr.substr(b32_len)) != suffix) {
+        return false;
+    }
+
+    // Remove the ".b32.i2p" suffix and pad to a multiple of 8 chars, so DecodeBase32()
+    // can decode it.
+    const std::string b32_padded = addr.substr(0, b32_len) + "====";
+
+    bool invalid;
+    const auto& address_bytes = DecodeBase32(b32_padded.c_str(), &invalid);
+
+    if (invalid || address_bytes.size() != ADDR_I2P_SIZE) {
+        return false;
+    }
+
+    m_net = NET_I2P;
+    m_addr.assign(address_bytes.begin(), address_bytes.end());
+
+    return true;
+}
+
 CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)
 {
     m_net = NET_IPV4;