Add send-money-json-API sample

src/samples/CMakeLists.txt

@@ -7,6 +7,7 @@ if (NOT ${CMAKE_BUILD_TYPE} MATCHES "Coverage")
 	add_subdirectory(asyncawait)
 	add_subdirectory(pastebin)
 	add_subdirectory(smolsite)
+	add_subdirectory(send-money-json-api)
 endif()
 
 add_subdirectory(techempower)

src/samples/send-money-json-api/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_executable(send-money-json-api
+	main.c
+	../techempower/json.c
+)
+
+target_link_libraries(send-money-json-api
+	${LWAN_COMMON_LIBS}
+	${ADDITIONAL_LIBRARIES}
+)

src/samples/send-money-json-api/main.c

@@ -0,0 +1,151 @@
+/*
+ * lwan - web server
+ * Copyright (c) 2024 L. A. F. Pereira <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ */
+
+/*
+ * Hastily written to compare results with other languages and
+ * frameworks after this Twitter thread:
+ *   https://twitter.com/iSeiryu/status/1793830738153889902
+ */
+
+#include <stdbool.h>
+#include <time.h>
+
+#define ARRAY_SIZE N_ELEMENTS
+
+#include "../techempower/json.h"
+#include "lwan.h"
+
+struct address {
+    const char *street;
+    const char *city;
+    const char *state;
+    const char *zip;
+};
+
+struct account_holder {
+    const char *id;
+    const char *firstName;
+    const char *lastName;
+    struct address address;
+    const char *email;
+};
+
+struct send_money_request {
+    struct account_holder from, to;
+    int amount;
+    const char *sendOn;
+};
+
+struct receipt {
+    char *from_account;
+    char *to_account;
+    char *created_on;
+    char *to_address;
+    int amount;
+};
+
+static const struct json_obj_descr receipt_descr[] = {
+    JSON_OBJ_DESCR_PRIM(struct receipt, from_account, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct receipt, to_account, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct receipt, amount, JSON_TOK_NUMBER),
+    JSON_OBJ_DESCR_PRIM(struct receipt, created_on, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct receipt, to_address, JSON_TOK_STRING),
+};
+
+static const struct json_obj_descr address_descr[] = {
+    JSON_OBJ_DESCR_PRIM(struct address, street, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct address, city, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct address, state, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct address, zip, JSON_TOK_STRING),
+};
+
+static const struct json_obj_descr account_holder_descr[] = {
+    JSON_OBJ_DESCR_PRIM(struct account_holder, id, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct account_holder, firstName, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct account_holder, lastName, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_PRIM(struct account_holder, email, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_OBJECT(struct account_holder, address, address_descr),
+};
+
+static const struct json_obj_descr send_money_request_descr[] = {
+    JSON_OBJ_DESCR_PRIM(struct send_money_request, amount, JSON_TOK_NUMBER),
+    JSON_OBJ_DESCR_PRIM(struct send_money_request, sendOn, JSON_TOK_STRING),
+    JSON_OBJ_DESCR_OBJECT(
+        struct send_money_request, from, account_holder_descr),
+    JSON_OBJ_DESCR_OBJECT(struct send_money_request, to, account_holder_descr),
+};
+
+static int append_to_strbuf(const char *bytes, size_t len, void *data)
+{
+    struct lwan_strbuf *strbuf = data;
+
+    return !lwan_strbuf_append_str(strbuf, bytes, len);
+}
+
+static inline struct tm *localtime_now(void)
+{
+    static __thread struct tm result;
+    time_t now = time(NULL);
+    return localtime_r(&now, &result);
+}
+
+LWAN_HANDLER_ROUTE(send_money, "/send-money")
+{
+    struct send_money_request smr;
+    const struct lwan_value *body;
+
+    if (lwan_request_get_method(request) != REQUEST_METHOD_POST)
+        return HTTP_BAD_REQUEST;
+
+    body = lwan_request_get_request_body(request);
+    if (!body) {
+        return HTTP_BAD_REQUEST;
+    }
+
+    if (json_obj_parse(body->value, body->len, send_money_request_descr,
+                       N_ELEMENTS(send_money_request_descr),
+                       &smr) != (1 << 0 | 1 << 1 | 1 << 2 | 1 << 3)) {
+        return HTTP_BAD_REQUEST;
+    }
+
+    char formatted_time[25];
+    strftime(formatted_time, 25, "%FT%T%z", localtime_now());
+
+    struct receipt r = {
+        .from_account = coro_printf(request->conn->coro, "%s %s",
+                                    smr.from.firstName, smr.from.lastName),
+        .to_account = coro_printf(request->conn->coro, "%s %s",
+                                  smr.to.firstName, smr.to.lastName),
+        .to_address = coro_printf(request->conn->coro, "%s, %s, %s, %s",
+                                  smr.to.address.street, smr.to.address.city,
+                                  smr.to.address.state, smr.to.address.zip),
+        .created_on = formatted_time,
+        .amount = smr.amount,
+    };
+    if (json_obj_encode_full(receipt_descr, N_ELEMENTS(receipt_descr), &r,
+                             append_to_strbuf, response->buffer, false) != 0) {
+        return HTTP_INTERNAL_ERROR;
+    }
+
+    response->mime_type = "application/json";
+    return HTTP_OK;
+}
+
+int main(void) { return lwan_main(); }