Fork of the espurna firmware for `mhsw` switches
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/*
API MODULE
Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
*/
#if WEB_SUPPORT
#include <ESPAsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <ArduinoJson.h>
#include <vector>
typedef struct {
char * url;
char * key;
api_get_callback_f getFn = NULL;
api_put_callback_f putFn = NULL;
} web_api_t;
std::vector<web_api_t> _apis;
// -----------------------------------------------------------------------------
// API
// -----------------------------------------------------------------------------
bool _authAPI(AsyncWebServerRequest *request) {
if (getSetting("apiEnabled", API_ENABLED).toInt() == 0) {
DEBUG_MSG_P(PSTR("[WEBSERVER] HTTP API is not enabled\n"));
request->send(403);
return false;
}
if (!request->hasParam("apikey", (request->method() == HTTP_PUT))) {
DEBUG_MSG_P(PSTR("[WEBSERVER] Missing apikey parameter\n"));
request->send(403);
return false;
}
AsyncWebParameter* p = request->getParam("apikey", (request->method() == HTTP_PUT));
if (!p->value().equals(getSetting("apiKey"))) {
DEBUG_MSG_P(PSTR("[WEBSERVER] Wrong apikey parameter\n"));
request->send(403);
return false;
}
return true;
}
bool _asJson(AsyncWebServerRequest *request) {
bool asJson = false;
if (request->hasHeader("Accept")) {
AsyncWebHeader* h = request->getHeader("Accept");
asJson = h->value().equals("application/json");
}
return asJson;
}
ArRequestHandlerFunction _bindAPI(unsigned int apiID) {
return [apiID](AsyncWebServerRequest *request) {
webLog(request);
if (!_authAPI(request)) return;
web_api_t api = _apis[apiID];
// Check if its a PUT
if (api.putFn != NULL) {
if (request->hasParam("value", request->method() == HTTP_PUT)) {
AsyncWebParameter* p = request->getParam("value", request->method() == HTTP_PUT);
(api.putFn)((p->value()).c_str());
}
}
// Get response from callback
char value[API_BUFFER_SIZE];
(api.getFn)(value, API_BUFFER_SIZE);
// The response will be a 404 NOT FOUND if the resource is not available
if (!value) {
DEBUG_MSG_P(PSTR("[API] Sending 404 response\n"));
request->send(404);
return;
}
DEBUG_MSG_P(PSTR("[API] Sending response '%s'\n"), value);
// Format response according to the Accept header
if (_asJson(request)) {
char buffer[64];
snprintf_P(buffer, sizeof(buffer), PSTR("{ \"%s\": %s }"), api.key, value);
request->send(200, "application/json", buffer);
} else {
request->send(200, "text/plain", value);
}
};
}
void _onAPIs(AsyncWebServerRequest *request) {
webLog(request);
if (!_authAPI(request)) return;
bool asJson = _asJson(request);
String output;
if (asJson) {
DynamicJsonBuffer jsonBuffer;
JsonObject& root = jsonBuffer.createObject();
for (unsigned int i=0; i < _apis.size(); i++) {
root[_apis[i].key] = _apis[i].url;
}
root.printTo(output);
request->send(200, "application/json", output);
} else {
for (unsigned int i=0; i < _apis.size(); i++) {
output += _apis[i].key + String(" -> ") + _apis[i].url + String("\n");
}
request->send(200, "text/plain", output);
}
}
void _onRPC(AsyncWebServerRequest *request) {
webLog(request);
if (!_authAPI(request)) return;
//bool asJson = _asJson(request);
int response = 404;
if (request->hasParam("action")) {
AsyncWebParameter* p = request->getParam("action");
String action = p->value();
DEBUG_MSG_P(PSTR("[RPC] Action: %s\n"), action.c_str());
if (action.equals("reset")) {
response = 200;
deferredReset(100, CUSTOM_RESET_RPC);
}
}
request->send(response);
}
// -----------------------------------------------------------------------------
void apiRegister(const char * url, const char * key, api_get_callback_f getFn, api_put_callback_f putFn) {
// Store it
web_api_t api;
char buffer[40];
snprintf_P(buffer, sizeof(buffer), PSTR("/api/%s"), url);
api.url = strdup(buffer);
api.key = strdup(key);
api.getFn = getFn;
api.putFn = putFn;
_apis.push_back(api);
// Bind call
unsigned int methods = HTTP_GET;
if (putFn != NULL) methods += HTTP_PUT;
webServer()->on(buffer, methods, _bindAPI(_apis.size() - 1));
}
void apiSetup() {
webServer()->on("/apis", HTTP_GET, _onAPIs);
webServer()->on("/rpc", HTTP_GET, _onRPC);
}
#endif // WEB_SUPPORT