WebResource.cpp

/**The MIT License (MIT)
  Copyright (c) 2015 by Daniel Eichhorn
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  See more at http://blog.squix.ch
*/

#include "WebResource.h"
#include "Util.h"
#include <SD.h>
#include <WiFiManager.h>

/*
  NOTE: Jared Gaillard - This is a modified version of the WebResource by Daniel Eichhorn.
*/

WebResource::WebResource() {
}

void WebResource::downloadFile(String url, String filename) {
  downloadFile(url, filename, nullptr);
}

void WebResource::downloadFile(String url, String filename1, ProgressCallback progressCallback) {
  char filename[filename1.length() + 2];
  filename1.toCharArray(filename, filename1.length() + 1);

  Sprint(F("Downloading: "));
  Sprint(url);
  Sprint(F(" and saving as "));
  Sprintln(filename);

  if (SD.exists(filename) == true) {
    Sprintln(F("File already exists. Skipping"));
    return;
  }

  ESP8266WiFiMulti _wifiMulti;

  // wait for WiFi connection
  if ((_wifiMulti.run() == WL_CONNECTED)) {
    HTTPClient http;

    Sprint(F("[HTTP] begin...\n"));

    // configure server and url
    http.begin(url);

    Sprint(F("[HTTP] GET...\n"));
    // start connection and send HTTP header
    int httpCode = http.GET();
    if (httpCode > 0) {
      File f = SD.open(filename, FILE_WRITE );
      if (!f) {
        Sprintln(F("file open failed"));
        return;
      }
      // HTTP header has been send and Server response header has been handled
      Sprint("[HTTP] GET... code: ");
      Sprintln(String(httpCode));

      // file found at server
      if (httpCode == HTTP_CODE_OK) {

        // get length of document (is -1 when Server sends no Content-Length header)
        int total = http.getSize();
        int len = total;
        progressCallback(filename, 0, total);
        // create buffer for read
        uint8_t buff[128] = { 0 };

        // get tcp stream
        WiFiClient * stream = http.getStreamPtr();

        // read all data from server
        while (http.connected() && (len > 0 || len == -1)) {
          // get available data size
          size_t size = stream->available();

          if (size) {
            // read up to 128 byte
            int c = stream->readBytes(buff, ((size > sizeof(buff)) ? sizeof(buff) : size));

            // write it to file
            f.write(buff, c);

            if (len > 0) {
              len -= c;
            }
            progressCallback(filename, total - len, total);
          }
          delay(1);
        }

        Sprintln();
        Sprintln(F("[HTTP] connection closed or file end.\n"));

      }
      f.close();
    } else {
      Sprint(F("[HTTP] GET... failed, error: "));
      Sprintln(http.errorToString(httpCode).c_str());
    }

    http.end();
  }
}