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webservices.ino
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webservices.ino
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// Webservice to obtain customer's name
String getCustomerName() {
std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);
client->setInsecure();
HTTPClient https;
String payload;
// Make request to target host with customerName call and customerNumber
if (https.begin(*client, "https://" + host + getCustomerNameApi + customerNumber)) {
Serial.print("[HTTPS] GET...\n");
// start connection and send HTTP header with API secret
https.addHeader("sbf-API-secret", apiSecret);
int httpCode = https.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTPS] GET... code: %d\n", httpCode);
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
// Get result and remove first and last characters ""
payload = https.getString();
payload.remove(0,1);
payload.remove(payload.length()-1);
Serial.println(payload);
} else if (httpCode == HTTP_CODE_NOT_FOUND) {
// User with specified ID not found - error https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h
drawApiStandardError(1);
delay(2000);
resetState();
} else {
// Either bad secret or not a number - error https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h
drawTerminatingError();
delay(2000);
resetState();
}
} else {
Serial.printf("[HTTPS] GET... failed, error: %s\n", https.errorToString(httpCode).c_str());
// Received HTTP Error Code https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h
drawTerminatingError();
delay(2000);
resetState();
}
https.end();
return payload;
} else {
// Error making HTTP request
drawTerminatingError();
delay(2000);
resetState();
}
}
// Webservice to make product order
String postKeypadOrder(char productNumber) {
std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);
client->setInsecure();
HTTPClient https;
String payload;
DynamicJsonDocument doc(1024);
// Make request to target host and api url
if (https.begin(*client, "https://" + host + postKeypadOrderApi)) {
Serial.print("[HTTPS] POST...\n");
// Start connection and send HTTP header with API secret and content type
https.addHeader("sbf-API-secret", apiSecret);
https.addHeader("Content-Type", "application/json");
// Make HTTP POST request with body containing customerNumber and productNumber
int httpCode = https.POST("{\"customer\":" + customerNumber + ",\"product\":" + productNumber + "}" );
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTPS] POST... code: %d\n", httpCode);
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
// Get result and parse JSON
payload = https.getString();
auto error = deserializeJson(doc, payload);
if (error) {
Serial.print(F("deserializeJson() failed with code "));
Serial.println(error.c_str());
return "ERROR";
}
const char* productName = doc["product"]["name"];
const int productPrice = doc["product"]["price"];
drawProductBought(productName, productPrice);
delay(3000);
resetState();
} else if (httpCode == HTTP_CODE_NOT_FOUND) {
// User with specified ID not found - error https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h
payload = https.getString();
Serial.println(payload);
if (payload == "\"USER_NOT_FOUND\"") {
drawApiStandardError(1);
} else if (payload == "\"PRODUCT_NOT_FOUND\"") {
drawApiStandardError(2);
} else {
// STOCK_NOT_FOUND
drawApiStandardError(3);
}
delay(2000);
resetState();
} else {
// Either bad secret or different error - error https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h
drawTerminatingError();
delay(2000);
resetState();
}
} else {
Serial.printf("[HTTPS] GET... failed, error: %s\n", https.errorToString(httpCode).c_str());
// Received HTTP Error Code https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h
drawTerminatingError();
delay(2000);
resetState();
}
https.end();
return payload;
} else {
// Error making HTTP request
drawTerminatingError();
delay(2000);
resetState();
}
}