forked from me-no-dev/ESPAsyncWebServer
1d275900eb
* Prevent buffer overflow on received data * pass to 7 char to avoid save to flash by SDK * return _contentLength, avoid array reparse to know len * Added FlashStringHelper for text and binary * Added FlashStringHelper also to AsyncWebSocketClient * Added PROGMEM doc * Corrected binary was sending PSTR as text, addded len * Server calls client method and code as asked @me-no-dev * server calls client method and code as asked by @me-no-dev * Changed Code presentation
82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
// ESPasyncJson.h
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/*
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Async Response to use with arduinoJson and asyncwebserver
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Written by Andrew Melvin (SticilFace) with help from me-no-dev and BBlanchon.
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example of callback in use
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server.on("/json", HTTP_ANY, [](AsyncWebServerRequest * request) {
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AsyncJsonResponse * response = new AsyncJsonResponse();
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JsonObject& root = response->getRoot();
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root["key1"] = "key number one";
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JsonObject& nested = root.createNestedObject("nested");
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nested["key1"] = "key number one";
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response->setLength();
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request->send(response);
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});
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*/
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#ifndef ASYNC_JSON_H_
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#define ASYNC_JSON_H_
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#include <ArduinoJson.h>
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/*
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* Json Response
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* */
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class ChunkPrint : public Print {
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private:
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uint8_t* _destination;
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size_t _to_skip;
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size_t _to_write;
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size_t _pos;
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public:
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ChunkPrint(uint8_t* destination, size_t from, size_t len)
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: _destination(destination), _to_skip(from), _to_write(len), _pos{0} {}
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virtual ~ChunkPrint(){}
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size_t write(uint8_t c){
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if (_to_skip > 0) {
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_to_skip--;
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return 1;
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} else if (_to_write > 0) {
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_to_write--;
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_destination[_pos++] = c;
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return 1;
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}
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return 0;
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}
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};
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class AsyncJsonResponse: public AsyncAbstractResponse {
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private:
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DynamicJsonBuffer _jsonBuffer;
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JsonVariant _root;
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bool _isValid;
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public:
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AsyncJsonResponse(bool isArray=false): _isValid{false} {
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_code = 200;
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_contentType = "text/json";
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if(isArray)
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_root = _jsonBuffer.createArray();
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else
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_root = _jsonBuffer.createObject();
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}
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~AsyncJsonResponse() {}
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JsonVariant & getRoot() { return _root; }
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bool _sourceValid() { return _isValid; }
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size_t setLength() {
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_contentLength = _root.measureLength();
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if (_contentLength) { _isValid = true; }
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return _contentLength;
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}
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size_t _fillBuffer(uint8_t *data, size_t len){
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ChunkPrint dest(data, _sentLength, len);
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_root.printTo( dest ) ;
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return len;
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}
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};
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#endif
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