v0.2.2 - Working on config setup

src/config.h

@@ -0,0 +1,223 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <sqlite3.h>
+#include <time.h>
+#include <stddef.h>
+#include <cjson/cJSON.h>
+
+// Configuration system constants
+#define CONFIG_KEY_MAX_LENGTH 64
+#define CONFIG_VALUE_MAX_LENGTH 512
+#define CONFIG_DESCRIPTION_MAX_LENGTH 256
+#define CONFIG_XDG_DIR_NAME "c-relay"
+#define CONFIG_FILE_NAME "c_relay_config_event.json"
+#define CONFIG_PRIVKEY_ENV "C_RELAY_CONFIG_PRIVKEY"
+#define NOSTR_PUBKEY_HEX_LENGTH 64
+#define NOSTR_PRIVKEY_HEX_LENGTH 64
+#define NOSTR_EVENT_ID_HEX_LENGTH 64
+#define NOSTR_SIGNATURE_HEX_LENGTH 128
+
+// Protocol and implementation constants (hardcoded - should NOT be configurable)
+#define SUBSCRIPTION_ID_MAX_LENGTH 64
+#define CLIENT_IP_MAX_LENGTH 64
+#define RELAY_NAME_MAX_LENGTH 128
+#define RELAY_DESCRIPTION_MAX_LENGTH 1024
+#define RELAY_URL_MAX_LENGTH 256
+#define RELAY_CONTACT_MAX_LENGTH 128
+#define RELAY_PUBKEY_MAX_LENGTH 65
+#define DATABASE_PATH "db/c_nostr_relay.db"
+
+// Default configuration values (used as fallbacks if database config fails)
+#define DEFAULT_PORT 8888
+#define DEFAULT_HOST "127.0.0.1"
+#define MAX_CLIENTS 100
+#define MAX_SUBSCRIPTIONS_PER_CLIENT 20
+#define MAX_TOTAL_SUBSCRIPTIONS 5000
+#define MAX_FILTERS_PER_SUBSCRIPTION 10
+
+// Configuration types
+typedef enum {
+    CONFIG_TYPE_SYSTEM = 0,
+    CONFIG_TYPE_USER = 1,
+    CONFIG_TYPE_RUNTIME = 2
+} config_type_t;
+
+// Configuration data types
+typedef enum {
+    CONFIG_DATA_STRING = 0,
+    CONFIG_DATA_INTEGER = 1,
+    CONFIG_DATA_BOOLEAN = 2,
+    CONFIG_DATA_JSON = 3
+} config_data_type_t;
+
+// Configuration validation result
+typedef enum {
+    CONFIG_VALID = 0,
+    CONFIG_INVALID_TYPE = 1,
+    CONFIG_INVALID_RANGE = 2,
+    CONFIG_INVALID_FORMAT = 3,
+    CONFIG_MISSING_REQUIRED = 4
+} config_validation_result_t;
+
+// Configuration entry structure
+typedef struct {
+    char key[CONFIG_KEY_MAX_LENGTH];
+    char value[CONFIG_VALUE_MAX_LENGTH];
+    char description[CONFIG_DESCRIPTION_MAX_LENGTH];
+    config_type_t config_type;
+    config_data_type_t data_type;
+    int is_sensitive;
+    int requires_restart;
+    time_t created_at;
+    time_t updated_at;
+} config_entry_t;
+
+// Configuration manager state
+typedef struct {
+    sqlite3* db;
+    sqlite3_stmt* get_config_stmt;
+    sqlite3_stmt* set_config_stmt;
+    sqlite3_stmt* log_change_stmt;
+    
+    // Configuration loading status
+    int file_config_loaded;
+    int database_config_loaded;
+    time_t last_reload;
+    
+    // XDG configuration directory
+    char config_dir_path[512];
+    char config_file_path[600];
+} config_manager_t;
+
+// Global configuration manager instance
+extern config_manager_t g_config_manager;
+
+// ================================
+// CORE CONFIGURATION FUNCTIONS
+// ================================
+
+// Initialize configuration system
+int init_configuration_system(void);
+
+// Cleanup configuration system
+void cleanup_configuration_system(void);
+
+// Load configuration from all sources (file -> database -> defaults)
+int load_configuration(void);
+
+// Apply loaded configuration to global variables
+int apply_configuration_to_globals(void);
+
+// ================================
+// DATABASE CONFIGURATION FUNCTIONS
+// ================================
+
+// Initialize database prepared statements
+int init_config_database_statements(void);
+
+// Get configuration value from database
+int get_database_config(const char* key, char* value, size_t value_size);
+
+// Set configuration value in database
+int set_database_config(const char* key, const char* new_value, const char* changed_by);
+
+// Load all configuration from database
+int load_config_from_database(void);
+
+// ================================
+// FILE CONFIGURATION FUNCTIONS
+// ================================
+
+// Get XDG configuration directory path
+int get_xdg_config_dir(char* path, size_t path_size);
+
+// Check if configuration file exists
+int config_file_exists(void);
+
+// Load configuration from file
+int load_config_from_file(void);
+
+// Validate and apply Nostr configuration event
+int validate_and_apply_config_event(const cJSON* event);
+
+// Validate Nostr event structure
+int validate_nostr_event_structure(const cJSON* event);
+
+// Validate configuration tags array
+int validate_config_tags(const cJSON* tags);
+
+// Extract and apply configuration tags to database
+int extract_and_apply_config_tags(const cJSON* tags);
+
+// ================================
+// CONFIGURATION ACCESS FUNCTIONS
+// ================================
+
+// Get configuration value (checks all sources: file -> database -> environment -> defaults)
+const char* get_config_value(const char* key);
+
+// Get configuration value as integer
+int get_config_int(const char* key, int default_value);
+
+// Get configuration value as boolean
+int get_config_bool(const char* key, int default_value);
+
+// Set configuration value (updates database)
+int set_config_value(const char* key, const char* value);
+
+// ================================
+// CONFIGURATION VALIDATION
+// ================================
+
+// Validate configuration value
+config_validation_result_t validate_config_value(const char* key, const char* value);
+
+// Log validation error
+void log_config_validation_error(const char* key, const char* value, const char* error);
+
+// ================================
+// UTILITY FUNCTIONS
+// ================================
+
+// Convert config type enum to string
+const char* config_type_to_string(config_type_t type);
+
+// Convert config data type enum to string
+const char* config_data_type_to_string(config_data_type_t type);
+
+// Convert string to config type enum
+config_type_t string_to_config_type(const char* str);
+
+// Convert string to config data type enum
+config_data_type_t string_to_config_data_type(const char* str);
+
+// Check if configuration key requires restart
+int config_requires_restart(const char* key);
+
+// ================================
+// NOSTR EVENT GENERATION FUNCTIONS
+// ================================
+
+// Generate configuration file with valid Nostr event if it doesn't exist
+int generate_config_file_if_missing(void);
+
+// Create a valid Nostr configuration event from database values
+cJSON* create_config_nostr_event(const char* privkey_hex);
+
+// Generate a random private key (32 bytes as hex string)
+int generate_random_privkey(char* privkey_hex, size_t buffer_size);
+
+// Derive public key from private key (using secp256k1)
+int derive_pubkey_from_privkey(const char* privkey_hex, char* pubkey_hex, size_t buffer_size);
+
+// Create Nostr event ID (SHA256 of serialized event data)
+int create_nostr_event_id(const cJSON* event, char* event_id_hex, size_t buffer_size);
+
+// Sign Nostr event (using secp256k1 Schnorr signature)
+int sign_nostr_event(const cJSON* event, const char* privkey_hex, char* signature_hex, size_t buffer_size);
+
+// Write configuration event to file
+int write_config_event_to_file(const cJSON* event);
+
+#endif // CONFIG_H