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#include "http_server.h"
#define TAG "httpd"
static void handle_set_int(httpd_req_t* req, int* val)
{
char buf[128];
int buf_len = httpd_req_get_url_query_len(req) + 1;
esp_err_t err;
if (buf_len > 1) {
if (buf_len > sizeof(buf)) {
ESP_LOGI(TAG, "Invalid request. Query string too long.");
httpd_resp_set_status(req, HTTPD_400);
return;
}
if ((err = httpd_req_get_url_query_str(req, buf, buf_len)) == ESP_OK) {
char param[32];
if (httpd_query_key_value(buf, "add", param, sizeof(param)) == ESP_OK) {
*val += atoi(param);
} else if (httpd_query_key_value(buf, "set", param, sizeof(param)) == ESP_OK) {
*val = atoi(param);
} else if (httpd_query_key_value(buf, "sub", param, sizeof(param)) == ESP_OK) {
*val -= atoi(param);
} else {
ESP_LOGI(TAG, "No valid parameters.");
httpd_resp_set_status(req, HTTPD_400);
return;
}
} else {
ESP_LOGI(TAG, "Unable to get URL query string. [%d]", err);
httpd_resp_set_status(req, HTTPD_500);
return;
}
} else {
ESP_LOGI(TAG, "No query string provided?");
httpd_resp_set_status(req, HTTPD_400);
return;
}
ESP_LOGI(TAG, "Now equals %d", *val);
httpd_resp_set_status(req, HTTPD_204);
}
static void handle_set_bool(httpd_req_t* req, bool* val)
{
char buf[128];
int buf_len = httpd_req_get_url_query_len(req) + 1;
if (buf_len > 1) {
if (buf_len > sizeof(buf)) {
ESP_LOGI(TAG, "Invalid request. Query string too long.");
httpd_resp_set_status(req, HTTPD_400);
return;
}
if (httpd_req_get_url_query_str(req, buf, buf_len) == ESP_OK) {
char param[32];
if (httpd_query_key_value(buf, "set", param, sizeof(param)) == ESP_OK) {
if (!strcmp(param, "on")) {
*val = true;
} else if (!strcmp(param, "off")) {
*val = false;
} else if (!strcmp(param, "toggle")) {
*val = !*val;
} else {
ESP_LOGI(TAG, "Invalid request. Invalid param value.");
httpd_resp_set_status(req, HTTPD_400);
return;
}
}
}
}
httpd_resp_set_status(req, HTTPD_204);
}
static void handle_set_uint8_t(httpd_req_t* req, uint8_t* val)
{
int tmp = *val;
handle_set_int(req, &tmp);
*val = tmp;
}
static void handle_set_uint32_t(httpd_req_t* req, uint32_t* val)
{
int tmp = *val;
handle_set_int(req, &tmp);
*val = tmp;
}
#define STATE_PARAM(typ, attr, ...) \
static esp_err_t handle_set_ ## attr (httpd_req_t *req) { \
ESP_LOGI(TAG, "Handling [%s] (%s)", #attr, req->uri); \
ws_params_t* params = (ws_params_t*) req->user_ctx; \
httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*"); \
handle_set_ ## typ (req, ¶ms->state. attr); \
httpd_resp_send(req, NULL, 0); \
return ESP_OK; \
} \
static httpd_uri_t http_ ## attr ## _handler = { \
.uri = "/" #attr, \
.method = HTTP_POST, \
.handler = handle_set_ ## attr, \
.user_ctx = NULL \
};
#include "state_params.i"
#undef STATE_PARAM
static size_t write_uint32_t_value(
char** out, size_t len, const char* attr, const char* dn, uint32_t value)
{
size_t newlen = snprintf(*out, len, "\"%s\":{\"type\":\"uint32_t\",\"value\":\"%u\",\"disp\":\"%s\"}",
attr, (unsigned int) value, dn);
*out += newlen;
return len - newlen;
}
static size_t write_uint8_t_value(
char** out, size_t len, const char* attr, const char* dn, uint8_t value)
{
size_t newlen = snprintf(*out, len, "\"%s\":{\"type\":\"uint8_t\",\"value\":\"%u\",\"disp\":\"%s\"}",
attr, (unsigned int)value, dn);
*out += newlen;
return len - newlen;
}
static size_t write_int_value(
char** out, size_t len, const char* attr, const char* dn, int value)
{
size_t newlen = snprintf(*out, len, "\"%s\":{\"type\":\"int\",\"value\":\"%d\",\"disp\":\"%s\"}",
attr, value, dn);
*out += newlen;
return len - newlen;
}
static size_t write_bool_value(
char** out, size_t len, const char* attr, const char* dn, bool value)
{
size_t newlen = snprintf(*out, len, "\"%s\":{\"type\":\"bool\",\"value\":\"%s\",\"disp\":\"%s\"}",
attr, value ? "on" : "off", dn);
*out += newlen;
return len - newlen;
}
static esp_err_t handle_get_params(httpd_req_t* req)
{
httpd_resp_set_hdr(req, "Access-Control-Allow-Origin", "*"); \
size_t len = NUMBER_PARAMS * 128;
char out_buffer[len + 1];
out_buffer[len] = 0;
char* out_ptr = out_buffer;
ws_params_t* ws_params = (ws_params_t*) req->user_ctx;
bool write_comma = false;
httpd_resp_set_type(req, "application/json");
if (len > 1) {
*out_ptr = '{';
out_ptr ++;
len --;
}
#define STATE_PARAM(typ, attr, display, ...) \
if (write_comma && len > 1) { \
*(out_ptr++) = ','; \
len --; \
} \
len = write_ ## typ ## _value( \
&out_ptr, len, #attr, display, ws_params->state. attr); \
write_comma = true;
#include "state_params.i"
#undef STATE_PARAM
if (len > 3) {
*(out_ptr++) = '}'; len --;
*(out_ptr++) = '\r'; len --;
*(out_ptr++) = '\n'; len --;
}
if (len > 1) {
*(out_ptr++) = 0;
len --;
}
httpd_resp_set_status(req, HTTPD_200);
httpd_resp_send(req, out_buffer, strlen(out_buffer));
return ESP_OK;
}
static httpd_uri_t http_params_get_handler = {
.uri = "/params",
.method = HTTP_GET,
.handler = handle_get_params,
.user_ctx = NULL
};
httpd_handle_t start_webserver(ws_params_t* params)
{
httpd_handle_t server = NULL;
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
config.lru_purge_enable = true;
config.max_uri_handlers = NUMBER_PARAMS + 1;
ESP_LOGI(TAG, "Starting httpd server on port: '%d'", config.server_port);
if (httpd_start(&server, &config) == ESP_OK) {
http_params_get_handler.user_ctx = params;
httpd_register_uri_handler(server, &http_params_get_handler);
#define STATE_PARAM(typ, attr, ...) \
ESP_LOGI(TAG, "Registering URI handler [%s]", #attr); \
http_ ## attr ## _handler.user_ctx = params; \
httpd_register_uri_handler(server, & http_ ## attr ## _handler);
#include "state_params.i"
#undef STATE_PARAM
return server;
}
ESP_LOGI(TAG, "Error starting server!");
return NULL;
}
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