diff options
| -rw-r--r-- | include/nostr.hpp | 9 | ||||
| -rw-r--r-- | src/event.cpp | 36 |
2 files changed, 38 insertions, 7 deletions
diff --git a/include/nostr.hpp b/include/nostr.hpp index ce25446..fa407ef 100644 --- a/include/nostr.hpp +++ b/include/nostr.hpp @@ -54,6 +54,15 @@ private: * @remark The `createdAt` field defaults to the present if it is not already set. */ void validate(); + + /** + * @brief Generates an ID for the event. + * @param serializedData The serialized JSON string of all of the event data except the ID and + * the signature. + * @return A valid Nostr event ID. + * @remark The ID is a 32-bytes lowercase hex-encoded sha256 of the serialized event data. + */ + std::string generateId(std::string serializedData) const; }; /** diff --git a/src/event.cpp b/src/event.cpp index 6a179fa..a95657e 100644 --- a/src/event.cpp +++ b/src/event.cpp @@ -1,12 +1,19 @@ #include <ctime> +#include <iomanip> +#include <sstream> #include <string> #include <nlohmann/json.hpp> +#include <openssl/sha.h> #include "nostr.hpp" using nlohmann::json; +using std::hex; using std::invalid_argument; +using std::setw; +using std::setfill; using std::string; +using std::stringstream; using std::time; namespace nostr @@ -23,7 +30,6 @@ string Event::serialize() } json j = { - {"id", this->id}, {"pubkey", this->pubkey}, {"created_at", this->createdAt}, {"kind", this->kind}, @@ -31,6 +37,11 @@ string Event::serialize() {"content", this->content}, {"sig", this->sig} }; + + j["id"] = this->generateId(j.dump()); + + // TODO: Reach out to a signer to sign the event, then set the signature. + return j.dump(); }; @@ -48,12 +59,6 @@ void Event::deserialize(string jsonString) void Event::validate() { - bool hasId = this->id.length() > 0; - if (!hasId) - { - throw std::invalid_argument("Event::validate: The event id is required."); - } - bool hasPubkey = this->pubkey.length() > 0; if (!hasPubkey) { @@ -78,4 +83,21 @@ void Event::validate() throw std::invalid_argument("Event::validate: The event must be signed."); } }; + +string Event::generateId(string serializedData) const +{ + unsigned char hash[SHA256_DIGEST_LENGTH]; + SHA256_CTX sha256; + SHA256_Init(&sha256); + SHA256_Update(&sha256, serializedData.c_str(), serializedData.length()); + SHA256_Final(hash, &sha256); + + stringstream ss; + for (int i = 0; i < SHA256_DIGEST_LENGTH; i++) + { + ss << hex << setw(2) << setfill('0') << (int)hash[i]; + } + + return ss.str(); +}; } // namespace nostr |