Add method and route factory.

src/usb/lwip/rest_server.h

@@ -2,6 +2,40 @@
 #define PICO_KEYS_REST_SERVER_H
 
 #include "lwip/err.h"
+#include <stddef.h>
+#include <stdint.h>
+
+typedef enum {
+    REST_HTTP_GET = 0,
+    REST_HTTP_POST,
+    REST_HTTP_PUT,
+    REST_HTTP_DELETE
+} rest_http_method_t;
+
+typedef struct {
+    rest_http_method_t method;
+    const char *path;
+    const char *body;
+    size_t body_len;
+    const char *content_type;
+} rest_request_t;
+
+typedef struct {
+    uint16_t status_code;
+    const char *content_type;
+    const char *body;
+    size_t body_len;
+} rest_response_t;
+
+typedef int (*rest_route_handler_t)(const rest_request_t *request, rest_response_t *response);
+
+typedef struct {
+    rest_http_method_t method;
+    const char *path;
+    rest_route_handler_t handler;
+} rest_route_t;
+
+const rest_route_t *rest_get_routes(size_t *count);
 
 err_t rest_server_init(void);