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208 lines
5.6 KiB
208 lines
5.6 KiB
/*
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API MODULE
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Copyright (C) 2016-2018 by Xose Pérez <xose dot perez at gmail dot com>
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Module key prefix: api
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*/
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#if WEB_SUPPORT
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#include <ESPAsyncTCP.h>
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#include <ESPAsyncWebServer.h>
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#include <ArduinoJson.h>
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#include <vector>
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typedef struct {
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char * key;
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api_get_callback_f getFn = NULL;
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api_put_callback_f putFn = NULL;
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} web_api_t;
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std::vector<web_api_t> _apis;
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// -----------------------------------------------------------------------------
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bool _apiWebSocketOnReceive(const char * key, JsonVariant& value) {
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return (strncmp(key, "api", 3) == 0);
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}
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void _apiWebSocketOnSend(JsonObject& root) {
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root["apiEnabled"] = getSetting("apiEnabled", API_ENABLED).toInt() == 1;
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root["apiKey"] = getSetting("apiKey");
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root["apiRealTime"] = apiRealTime();
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}
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// -----------------------------------------------------------------------------
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// API
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// -----------------------------------------------------------------------------
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bool _authAPI(AsyncWebServerRequest *request) {
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if (getSetting("apiEnabled", API_ENABLED).toInt() == 0) {
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DEBUG_MSG_P(PSTR("[WEBSERVER] HTTP API is not enabled\n"));
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request->send(403);
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return false;
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}
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if (!request->hasParam("apikey", (request->method() == HTTP_PUT))) {
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DEBUG_MSG_P(PSTR("[WEBSERVER] Missing apikey parameter\n"));
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request->send(403);
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return false;
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}
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AsyncWebParameter* p = request->getParam("apikey", (request->method() == HTTP_PUT));
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if (!p->value().equals(getSetting("apiKey"))) {
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DEBUG_MSG_P(PSTR("[WEBSERVER] Wrong apikey parameter\n"));
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request->send(403);
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return false;
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}
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return true;
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}
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bool _asJson(AsyncWebServerRequest *request) {
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bool asJson = false;
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if (request->hasHeader("Accept")) {
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AsyncWebHeader* h = request->getHeader("Accept");
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asJson = h->value().equals("application/json");
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}
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return asJson;
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}
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ArRequestHandlerFunction _bindAPI(unsigned int apiID) {
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return [apiID](AsyncWebServerRequest *request) {
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webLog(request);
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if (!_authAPI(request)) return;
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web_api_t api = _apis[apiID];
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// Check if its a PUT
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if (api.putFn != NULL) {
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if (request->hasParam("value", request->method() == HTTP_PUT)) {
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AsyncWebParameter* p = request->getParam("value", request->method() == HTTP_PUT);
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(api.putFn)((p->value()).c_str());
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}
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}
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// Get response from callback
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char value[API_BUFFER_SIZE] = {0};
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(api.getFn)(value, API_BUFFER_SIZE);
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// The response will be a 404 NOT FOUND if the resource is not available
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if (0 == value[0]) {
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DEBUG_MSG_P(PSTR("[API] Sending 404 response\n"));
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request->send(404);
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return;
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}
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DEBUG_MSG_P(PSTR("[API] Sending response '%s'\n"), value);
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// Format response according to the Accept header
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if (_asJson(request)) {
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char buffer[64];
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if (isNumber(value)) {
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snprintf_P(buffer, sizeof(buffer), PSTR("{ \"%s\": %s }"), api.key, value);
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} else {
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snprintf_P(buffer, sizeof(buffer), PSTR("{ \"%s\": \"%s\" }"), api.key, value);
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}
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request->send(200, "application/json", buffer);
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} else {
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request->send(200, "text/plain", value);
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}
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};
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}
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void _onAPIs(AsyncWebServerRequest *request) {
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webLog(request);
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if (!_authAPI(request)) return;
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bool asJson = _asJson(request);
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char buffer[40];
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String output;
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if (asJson) {
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DynamicJsonBuffer jsonBuffer;
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JsonObject& root = jsonBuffer.createObject();
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for (unsigned int i=0; i < _apis.size(); i++) {
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snprintf_P(buffer, sizeof(buffer), PSTR("/api/%s"), _apis[i].key);
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root[_apis[i].key] = String(buffer);
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}
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root.printTo(output);
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jsonBuffer.clear();
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request->send(200, "application/json", output);
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} else {
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for (unsigned int i=0; i < _apis.size(); i++) {
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snprintf_P(buffer, sizeof(buffer), PSTR("/api/%s"), _apis[i].key);
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output += _apis[i].key + String(" -> ") + String(buffer) + String("\n");
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}
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request->send(200, "text/plain", output);
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}
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}
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void _onRPC(AsyncWebServerRequest *request) {
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webLog(request);
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if (!_authAPI(request)) return;
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//bool asJson = _asJson(request);
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int response = 404;
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if (request->hasParam("action")) {
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AsyncWebParameter* p = request->getParam("action");
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String action = p->value();
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DEBUG_MSG_P(PSTR("[RPC] Action: %s\n"), action.c_str());
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if (action.equals("reboot")) {
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response = 200;
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deferredReset(100, CUSTOM_RESET_RPC);
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}
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}
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request->send(response);
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}
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// -----------------------------------------------------------------------------
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void apiRegister(const char * key, api_get_callback_f getFn, api_put_callback_f putFn) {
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// Store it
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web_api_t api;
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char buffer[40];
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snprintf_P(buffer, sizeof(buffer), PSTR("/api/%s"), key);
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api.key = strdup(key);
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api.getFn = getFn;
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api.putFn = putFn;
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_apis.push_back(api);
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// Bind call
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unsigned int methods = HTTP_GET;
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if (putFn != NULL) methods += HTTP_PUT;
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webServer()->on(buffer, methods, _bindAPI(_apis.size() - 1));
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}
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void apiSetup() {
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webServer()->on("/apis", HTTP_GET, _onAPIs);
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webServer()->on("/rpc", HTTP_GET, _onRPC);
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wsOnSendRegister(_apiWebSocketOnSend);
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wsOnReceiveRegister(_apiWebSocketOnReceive);
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}
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bool apiRealTime() {
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return getSetting("apiRealTime", API_REAL_TIME_VALUES).toInt() == 1;
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}
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#endif // WEB_SUPPORT
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