Initial import

WebResource.cpp

@@ -0,0 +1,104 @@
+/**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"
+
+WebResource::WebResource(){
+  
+}
+
+void WebResource::downloadFile(String url, String filename) {
+  downloadFile(url, filename, nullptr);
+}
+
+void WebResource::downloadFile(String url, String filename, ProgressCallback progressCallback) {
+    Serial.println("Downloading " + url + " and saving as " + filename);
+
+    if (SPIFFS.exists(filename) == true) {
+      Serial.println("File already exists. Skipping");
+      return;
+    }
+    // wait for WiFi connection
+    if((_wifiMulti.run() == WL_CONNECTED)) {
+        HTTPClient http;
+
+        Serial.print("[HTTP] begin...\n");
+
+        // configure server and url
+        http.begin(url);
+
+        Serial.print("[HTTP] GET...\n");
+        // start connection and send HTTP header
+        int httpCode = http.GET();
+        if(httpCode > 0) {
+            //SPIFFS.remove(filename);
+            File f = SPIFFS.open(filename, "w+");
+            if (!f) {
+                Serial.println("file open failed");
+                return;
+            }
+            // HTTP header has been send and Server response header has been handled
+            Serial.printf("[HTTP] GET... code: %d\n", httpCode);
+
+            // file found at server
+            if(httpCode == HTTP_CODE_OK) {
+
+                // get lenght 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 Serial
+                        f.write(buff, c);
+
+                        if(len > 0) {
+                            len -= c;
+                        }
+                        progressCallback(filename, total - len,total);
+                    }
+                    delay(1);
+                }
+
+                Serial.println();
+                Serial.print("[HTTP] connection closed or file end.\n");
+
+            }
+            f.close();
+        } else {
+            Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
+        }
+        
+        http.end();
+    }
+}