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lpereiralpereira
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Add send-money-json-API sample
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‎src/samples/CMakeLists.txt

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

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

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add_executable(send-money-json-api
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main.c
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../techempower/json.c
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)
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target_link_libraries(send-money-json-api
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${LWAN_COMMON_LIBS}
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${ADDITIONAL_LIBRARIES}
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)

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

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

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