Hello everyone,
I am currently creating code that will send out a HTTP Get request to a S3 bucket. I have most of the code functional. I am able to connect to the AWS services and send out headers. However, I keep getting a 400 error (or some form of the 400 error) I believe that I have an issue with my headers and what I am sending out. I am currently using the ArduinoHttpClient library to handle the HTTP GET Requests.
Below is the copy of my code that is doing the GET requests. I have some values hidden for obvious security reasons
void updateConfigFileEthernet(String server)
{
EthernetClient secondClient;
bool connectionEstablished = false;
int err = 0;
int stringIndex = server.indexOf(",");
URLKVPair keyValuePairs[10];
String response[2];
String baseURL;
parseAmazonURL(server, baseURL, keyValuePairs);
int sectionIndex = baseURL.indexOf("//", 8); // Need to find the second one
response[0] = baseURL.substring(8, sectionIndex);
response[1] = baseURL.substring(sectionIndex + 1, baseURL.length());
for(auto printString : response){
Serial.println("Return Values:");
Serial.println(printString);
}
Serial.print("Base URL: ");
Serial.println(baseURL);
HttpClient http(secondClient, response[0]);
http.beginRequest();
http.get(response[1]);
keyValuePairs[2].value.replace("%2F", "/");
String creds = keyValuePairs[2].value;
String algorithmAmazon = keyValuePairs[0].value;
String amazonSignature = keyValuePairs[6].value;
String authorizationHeader = "Authorization: " + algorithmAmazon + " Credential=" + creds + ", SignedHeaders=host;x-amz-content-sha256;x-amz-date;x-amz-security-token, Signature=" + amazonSignature;
Serial.println("Auth Header:");
Serial.println(authorizationHeader);
http.sendHeader(authorizationHeader); // The Authorization header is as follows: Authorization: AWS4-HMAC-SHA256 Credential=<credValue>/20240212/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date;x-amz-security-token, Signature=<Signature value>
http.sendHeader(keyValuePairs[1].key, keyValuePairs[1].value); // This header is this value: X-Amz-Content-Sha256=UNSIGNED-PAYLOAD
http.sendHeader(keyValuePairs[3].key, keyValuePairs[3].value); // This header is this value: X-Amz-Date=20240212T003504Z
http.sendHeader(keyValuePairs[5].key, keyValuePairs[5].value); // This is the x-amz-security-token
// for(auto kvPairValue : keyValuePairs){
// if(kvPairValue.key != ""){
// http.sendHeader(kvPairValue.key, kvPairValue.value);
// Serial.println("Sending Out:");
// Serial.print("Key: ");
// Serial.print(kvPairValue.key);
// Serial.print(", Value: ");
// Serial.println(kvPairValue.value);
// }
// }
http.endRequest();
int statusCode = http.responseStatusCode();
Serial.print("GET Status code: ");
Serial.println(statusCode);
if(statusCode == 200){
//l,String getBody = http.responseBody();
http.skipResponseHeaders();
Serial.println("Connnection successful");
if(SPIFFS.exists("/CONFIG.txt")){
SPIFFS.remove("/CONFIG.txt");
}
testFile = SPIFFS.open("/CONFIG.txt", FILE_WRITE);
while(http.connected() || http.available()){
if(http.available()){
char c = http.read();
testFile.write(c);
Serial.print(c);
} else {
delay(1);
}
}
testFile.close();
transmitString("rst");
delay(10);
ESP.restart();
} else {
String getBody = http.responseBody();
Serial.println("Connection failed");
PrintUDPPort("Config file update failed - Connection unsuccesssful");
Serial.print("GET Response: ");
Serial.println(getBody);
}
}
As a side note, I am currently using this site as a basis for my HTTP GET request structure. I do have a security token that I am sending.
I should note that my current error is a 400 error that states :“InvalidTokenThe provided token is malformed or otherwise invalid.”