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@me-no-dev @Jeroen88 @copercini @atanisoft @FotoFieber @lonerzzz @h3ndrik @buddemat @APokorny @boarchuz
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/**
* HTTPClient.cpp
*
* Created on: 02.11.2015
*
* Copyright (c) 2015 Markus Sattler. All rights reserved.
* This file is part of the HTTPClient for Arduino.
* Port to ESP32 by Evandro Luis Copercini (2017),
* changed fingerprints to CA verification.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Adapted in October 2018
*/
#include <Arduino.h>
#include <esp32-hal-log.h>
#ifdef HTTPCLIENT_1_1_COMPATIBLE
#include <WiFi.h>
#include <WiFiClientSecure.h>
#endif
#include <StreamString.h>
#include <base64.h>
#include "HTTPClient.h"
#ifdef HTTPCLIENT_1_1_COMPATIBLE
class TransportTraits
{
public:
virtual ~TransportTraits()
{
}
virtual std::unique_ptr<WiFiClient> create()
{
return std::unique_ptr<WiFiClient>(new WiFiClient());
}
virtual bool verify(WiFiClient& client, const char* host)
{
return true;
}
};
class TLSTraits : public TransportTraits
{
public:
TLSTraits(const char* CAcert, const char* clicert = nullptr, const char* clikey = nullptr) :
_cacert(CAcert), _clicert(clicert), _clikey(clikey)
{
}
std::unique_ptr<WiFiClient> create() override
{
return std::unique_ptr<WiFiClient>(new WiFiClientSecure());
}
bool verify(WiFiClient& client, const char* host) override
{
WiFiClientSecure& wcs = static_cast<WiFiClientSecure&>(client);
wcs.setCACert(_cacert);
wcs.setCertificate(_clicert);
wcs.setPrivateKey(_clikey);
return true;
}
protected:
const char* _cacert;
const char* _clicert;
const char* _clikey;
};
#endif // HTTPCLIENT_1_1_COMPATIBLE
/**
* constructor
*/
HTTPClient::HTTPClient()
{
}
/**
* destructor
*/
HTTPClient::~HTTPClient()
{
if(_client) {
_client->stop();
}
if(_currentHeaders) {
delete[] _currentHeaders;
}
}
void HTTPClient::clear()
{
_returnCode = 0;
_size = -1;
_headers = "";
}
/**
* parsing the url for all needed parameters
* @param client Client&
* @param url String
* @param https bool
* @return success bool
*/
bool HTTPClient::begin(WiFiClient &client, String url) {
#ifdef HTTPCLIENT_1_1_COMPATIBLE
if(_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
#endif
_client = &client;
// check for : (http: or https:)
int index = url.indexOf(':');
if(index < 0) {
log_d("failed to parse protocol");
return false;
}
String protocol = url.substring(0, index);
if(protocol != "http" && protocol != "https") {
log_d("unknown protocol '%s'", protocol.c_str());
return false;
}
_port = (protocol == "https" ? 443 : 80);
return beginInternal(url, protocol.c_str());
}
/**
* directly supply all needed parameters
* @param client Client&
* @param host String
* @param port uint16_t
* @param uri String
* @param https bool
* @return success bool
*/
bool HTTPClient::begin(WiFiClient &client, String host, uint16_t port, String uri, bool https)
{
#ifdef HTTPCLIENT_1_1_COMPATIBLE
if(_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
#endif
_client = &client;
clear();
_host = host;
_port = port;
_uri = uri;
_protocol = (https ? "https" : "http");
return true;
}
#ifdef HTTPCLIENT_1_1_COMPATIBLE
bool HTTPClient::begin(String url, const char* CAcert)
{
if(_client && !_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
_port = 443;
if (!beginInternal(url, "https")) {
return false;
}
_secure = true;
_transportTraits = TransportTraitsPtr(new TLSTraits(CAcert));
return true;
}
/**
* parsing the url for all needed parameters
* @param url String
*/
bool HTTPClient::begin(String url)
{
if(_client && !_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
_port = 80;
if (!beginInternal(url, "http")) {
return begin(url, (const char*)NULL);
}
_transportTraits = TransportTraitsPtr(new TransportTraits());
return true;
}
#endif // HTTPCLIENT_1_1_COMPATIBLE
bool HTTPClient::beginInternal(String url, const char* expectedProtocol)
{
log_v("url: %s", url.c_str());
clear();
// check for : (http: or https:
int index = url.indexOf(':');
if(index < 0) {
log_e("failed to parse protocol");
return false;
}
_protocol = url.substring(0, index);
if (_protocol != expectedProtocol) {
log_w("unexpected protocol: %s, expected %s", _protocol.c_str(), expectedProtocol);
return false;
}
url.remove(0, (index + 3)); // remove http:// or https://
index = url.indexOf('/');
String host = url.substring(0, index);
url.remove(0, index); // remove host part
// get Authorization
index = host.indexOf('@');
if(index >= 0) {
// auth info
String auth = host.substring(0, index);
host.remove(0, index + 1); // remove auth part including @
_base64Authorization = base64::encode(auth);
}
// get port
index = host.indexOf(':');
if(index >= 0) {
_host = host.substring(0, index); // hostname
host.remove(0, (index + 1)); // remove hostname + :
_port = host.toInt(); // get port
} else {
_host = host;
}
_uri = url;
log_d("host: %s port: %d url: %s", _host.c_str(), _port, _uri.c_str());
return true;
}
#ifdef HTTPCLIENT_1_1_COMPATIBLE
bool HTTPClient::begin(String host, uint16_t port, String uri)
{
if(_client && !_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
clear();
_host = host;
_port = port;
_uri = uri;
_transportTraits = TransportTraitsPtr(new TransportTraits());
log_d("host: %s port: %d uri: %s", host.c_str(), port, uri.c_str());
return true;
}
bool HTTPClient::begin(String host, uint16_t port, String uri, const char* CAcert)
{
if(_client && !_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
clear();
_host = host;
_port = port;
_uri = uri;
if (strlen(CAcert) == 0) {
return false;
}
_secure = true;
_transportTraits = TransportTraitsPtr(new TLSTraits(CAcert));
return true;
}
bool HTTPClient::begin(String host, uint16_t port, String uri, const char* CAcert, const char* cli_cert, const char* cli_key)
{
if(_client && !_tcpDeprecated) {
log_d("mix up of new and deprecated api");
_canReuse = false;
end();
}
clear();
_host = host;
_port = port;
_uri = uri;
if (strlen(CAcert) == 0) {
return false;
}
_secure = true;
_transportTraits = TransportTraitsPtr(new TLSTraits(CAcert, cli_cert, cli_key));
return true;
}
#endif // HTTPCLIENT_1_1_COMPATIBLE
/**
* end
* called after the payload is handled
*/
void HTTPClient::end(void)
{
disconnect();
}
/**
* disconnect
* close the TCP socket
*/
void HTTPClient::disconnect()
{
if(connected()) {
if(_client->available() > 0) {
log_d("still data in buffer (%d), clean up.\n", _client->available());
while(_client->available() > 0) {
_client->read();
}
}
if(_reuse && _canReuse) {
log_d("tcp keep open for reuse\n");
} else {
log_d("tcp stop\n");
_client->stop();
_client = nullptr;
#ifdef HTTPCLIENT_1_1_COMPATIBLE
if(_tcpDeprecated) {
_transportTraits.reset(nullptr);
_tcpDeprecated.reset(nullptr);
}
#endif
}
} else {
log_d("tcp is closed\n");
}
}
/**
* connected
* @return connected status
*/
bool HTTPClient::connected()
{
if(_client) {
return ((_client->available() > 0) || _client->connected());
}
return false;
}
/**
* try to reuse the connection to the server
* keep-alive
* @param reuse bool
*/
void HTTPClient::setReuse(bool reuse)
{
_reuse = reuse;
}
/**
* set User Agent
* @param userAgent const char *
*/
void HTTPClient::setUserAgent(const String& userAgent)
{
_userAgent = userAgent;
}
/**
* set the Authorizatio for the http request
* @param user const char *
* @param password const char *
*/
void HTTPClient::setAuthorization(const char * user, const char * password)
{
if(user && password) {
String auth = user;
auth += ":";
auth += password;
_base64Authorization = base64::encode(auth);
}
}
/**
* set the Authorizatio for the http request
* @param auth const char * base64
*/
void HTTPClient::setAuthorization(const char * auth)
{
if(auth) {
_base64Authorization = auth;
}
}
/**
* set the timeout (ms) for establishing a connection to the server
* @param connectTimeout int32_t
*/
void HTTPClient::setConnectTimeout(int32_t connectTimeout)
{
_connectTimeout = connectTimeout;
}
/**
* set the timeout for the TCP connection
* @param timeout unsigned int
*/
void HTTPClient::setTimeout(uint16_t timeout)
{
_tcpTimeout = timeout;
if(connected()) {
_client->setTimeout((timeout + 500) / 1000);
}
}
/**
* use HTTP1.0
* @param use
*/
void HTTPClient::useHTTP10(bool useHTTP10)
{
_useHTTP10 = useHTTP10;
}
/**
* send a GET request
* @return http code
*/
int HTTPClient::GET()
{
return sendRequest("GET");
}
/**
* sends a post request to the server
* @param payload uint8_t *
* @param size size_t
* @return http code
*/
int HTTPClient::POST(uint8_t * payload, size_t size)
{
return sendRequest("POST", payload, size);
}
int HTTPClient::POST(String payload)
{
return POST((uint8_t *) payload.c_str(), payload.length());
}
/**
* sends a patch request to the server
* @param payload uint8_t *
* @param size size_t
* @return http code
*/
int HTTPClient::PATCH(uint8_t * payload, size_t size)
{
return sendRequest("PATCH", payload, size);
}
int HTTPClient::PATCH(String payload)
{
return PATCH((uint8_t *) payload.c_str(), payload.length());
}
/**
* sends a put request to the server
* @param payload uint8_t *
* @param size size_t
* @return http code
*/
int HTTPClient::PUT(uint8_t * payload, size_t size) {
return sendRequest("PUT", payload, size);
}
int HTTPClient::PUT(String payload) {
return PUT((uint8_t *) payload.c_str(), payload.length());
}
/**
* sendRequest
* @param type const char * "GET", "POST", ....
* @param payload String data for the message body
* @return
*/
int HTTPClient::sendRequest(const char * type, String payload)
{
return sendRequest(type, (uint8_t *) payload.c_str(), payload.length());
}
/**
* sendRequest
* @param type const char * "GET", "POST", ....
* @param payload uint8_t * data for the message body if null not send
* @param size size_t size for the message body if 0 not send
* @return -1 if no info or > 0 when Content-Length is set by server
*/
int HTTPClient::sendRequest(const char * type, uint8_t * payload, size_t size)
{
// connect to server
if(!connect()) {
return returnError(HTTPC_ERROR_CONNECTION_REFUSED);
}
if(payload && size > 0) {
addHeader(F("Content-Length"), String(size));
}
// send Header
if(!sendHeader(type)) {
return returnError(HTTPC_ERROR_SEND_HEADER_FAILED);
}
// send Payload if needed
if(payload && size > 0) {
if(_client->write(&payload[0], size) != size) {
return returnError(HTTPC_ERROR_SEND_PAYLOAD_FAILED);
}
}
// handle Server Response (Header)
return returnError(handleHeaderResponse());
}
/**
* sendRequest
* @param type const char * "GET", "POST", ....
* @param stream Stream * data stream for the message body
* @param size size_t size for the message body if 0 not Content-Length is send
* @return -1 if no info or > 0 when Content-Length is set by server
*/
int HTTPClient::sendRequest(const char * type, Stream * stream, size_t size)
{
if(!stream) {
return returnError(HTTPC_ERROR_NO_STREAM);
}
// connect to server
if(!connect()) {
return returnError(HTTPC_ERROR_CONNECTION_REFUSED);
}
if(size > 0) {
addHeader("Content-Length", String(size));
}
// send Header
if(!sendHeader(type)) {
return returnError(HTTPC_ERROR_SEND_HEADER_FAILED);
}
int buff_size = HTTP_TCP_BUFFER_SIZE;
int len = size;
int bytesWritten = 0;
if(len == 0) {
len = -1;
}
// if possible create smaller buffer then HTTP_TCP_BUFFER_SIZE
if((len > 0) && (len < HTTP_TCP_BUFFER_SIZE)) {
buff_size = len;
}
// create buffer for read
uint8_t * buff = (uint8_t *) malloc(buff_size);
if(buff) {
// read all data from stream and send it to server
while(connected() && (stream->available() > -1) && (len > 0 || len == -1)) {
// get available data size
int sizeAvailable = stream->available();
if(sizeAvailable) {
int readBytes = sizeAvailable;
// read only the asked bytes
if(len > 0 && readBytes > len) {
readBytes = len;
}
// not read more the buffer can handle
if(readBytes > buff_size) {
readBytes = buff_size;
}
// read data
int bytesRead = stream->readBytes(buff, readBytes);
// write it to Stream
int bytesWrite = _client->write((const uint8_t *) buff, bytesRead);
bytesWritten += bytesWrite;
// are all Bytes a writen to stream ?
if(bytesWrite != bytesRead) {
log_d("short write, asked for %d but got %d retry...", bytesRead, bytesWrite);
// check for write error
if(_client->getWriteError()) {
log_d("stream write error %d", _client->getWriteError());
//reset write error for retry
_client->clearWriteError();
}
// some time for the stream
delay(1);
int leftBytes = (readBytes - bytesWrite);
// retry to send the missed bytes
bytesWrite = _client->write((const uint8_t *) (buff + bytesWrite), leftBytes);
bytesWritten += bytesWrite;
if(bytesWrite != leftBytes) {
// failed again
log_d("short write, asked for %d but got %d failed.", leftBytes, bytesWrite);
free(buff);
return returnError(HTTPC_ERROR_SEND_PAYLOAD_FAILED);
}
}
// check for write error
if(_client->getWriteError()) {
log_d("stream write error %d", _client->getWriteError());
free(buff);
return returnError(HTTPC_ERROR_SEND_PAYLOAD_FAILED);
}
// count bytes to read left
if(len > 0) {
len -= readBytes;
}
delay(0);
} else {
delay(1);
}
}
free(buff);
if(size && (int) size != bytesWritten) {
log_d("Stream payload bytesWritten %d and size %d mismatch!.", bytesWritten, size);
log_d("ERROR SEND PAYLOAD FAILED!");
return returnError(HTTPC_ERROR_SEND_PAYLOAD_FAILED);
} else {
log_d("Stream payload written: %d", bytesWritten);
}
} else {
log_d("too less ram! need %d", HTTP_TCP_BUFFER_SIZE);
return returnError(HTTPC_ERROR_TOO_LESS_RAM);
}
// handle Server Response (Header)
return returnError(handleHeaderResponse());
}
/**
* size of message body / payload
* @return -1 if no info or > 0 when Content-Length is set by server
*/
int HTTPClient::getSize(void)
{
return _size;
}
/**
* returns the stream of the tcp connection
* @return WiFiClient
*/
WiFiClient& HTTPClient::getStream(void)
{
if (connected()) {
return *_client;
}
log_w("getStream: not connected");
static WiFiClient empty;
return empty;
}
/**
* returns a pointer to the stream of the tcp connection
* @return WiFiClient*
*/
WiFiClient* HTTPClient::getStreamPtr(void)
{
if(connected()) {
return _client;
}
log_w("getStreamPtr: not connected");
return nullptr;
}
/**
* write all message body / payload to Stream
* @param stream Stream *
* @return bytes written ( negative values are error codes )
*/
int HTTPClient::writeToStream(Stream * stream)
{
if(!stream) {
return returnError(HTTPC_ERROR_NO_STREAM);
}
if(!connected()) {
return returnError(HTTPC_ERROR_NOT_CONNECTED);
}
// get length of document (is -1 when Server sends no Content-Length header)
int len = _size;
int ret = 0;
if(_transferEncoding == HTTPC_TE_IDENTITY) {
ret = writeToStreamDataBlock(stream, len);
// have we an error?
if(ret < 0) {
return returnError(ret);
}
} else if(_transferEncoding == HTTPC_TE_CHUNKED) {
int size = 0;
while(1) {
if(!connected()) {
return returnError(HTTPC_ERROR_CONNECTION_LOST);
}
String chunkHeader = _client->readStringUntil('\n');
if(chunkHeader.length() <= 0) {
return returnError(HTTPC_ERROR_READ_TIMEOUT);
}
chunkHeader.trim(); // remove \r
// read size of chunk
len = (uint32_t) strtol((const char *) chunkHeader.c_str(), NULL, 16);
size += len;
log_d(" read chunk len: %d", len);
// data left?
if(len > 0) {
int r = writeToStreamDataBlock(stream, len);
if(r < 0) {
// error in writeToStreamDataBlock
return returnError(r);
}
ret += r;
} else {
// if no length Header use global chunk size
if(_size <= 0) {
_size = size;
}
// check if we have write all data out
if(ret != _size) {
return returnError(HTTPC_ERROR_STREAM_WRITE);
}
break;
}
// read trailing \r\n at the end of the chunk
char buf[2];
auto trailing_seq_len = _client->readBytes((uint8_t*)buf, 2);
if (trailing_seq_len != 2 || buf[0] != '\r' || buf[1] != '\n') {
return returnError(HTTPC_ERROR_READ_TIMEOUT);
}
delay(0);
}
} else {
return returnError(HTTPC_ERROR_ENCODING);
}
end();
return ret;
}
/**
* return all payload as String (may need lot of ram or trigger out of memory!)
* @return String
*/
String HTTPClient::getString(void)
{
StreamString sstring;
if(_size) {
// try to reserve needed memmory
if(!sstring.reserve((_size + 1))) {
log_d("not enough memory to reserve a string! need: %d", (_size + 1));
return "";
}
}
writeToStream(&sstring);
return sstring;
}
/**
* converts error code to String
* @param error int
* @return String
*/
String HTTPClient::errorToString(int error)
{
switch(error) {
case HTTPC_ERROR_CONNECTION_REFUSED:
return F("connection refused");
case HTTPC_ERROR_SEND_HEADER_FAILED:
return F("send header failed");
case HTTPC_ERROR_SEND_PAYLOAD_FAILED:
return F("send payload failed");
case HTTPC_ERROR_NOT_CONNECTED:
return F("not connected");
case HTTPC_ERROR_CONNECTION_LOST:
return F("connection lost");
case HTTPC_ERROR_NO_STREAM:
return F("no stream");
case HTTPC_ERROR_NO_HTTP_SERVER:
return F("no HTTP server");
case HTTPC_ERROR_TOO_LESS_RAM:
return F("too less ram");
case HTTPC_ERROR_ENCODING:
return F("Transfer-Encoding not supported");
case HTTPC_ERROR_STREAM_WRITE:
return F("Stream write error");
case HTTPC_ERROR_READ_TIMEOUT:
return F("read Timeout");
default:
return String();
}
}
/**
* adds Header to the request
* @param name
* @param value
* @param first
*/
void HTTPClient::addHeader(const String& name, const String& value, bool first, bool replace)
{
// not allow set of Header handled by code
if(!name.equalsIgnoreCase(F("Connection")) &&
!name.equalsIgnoreCase(F("User-Agent")) &&
!name.equalsIgnoreCase(F("Host")) &&
!(name.equalsIgnoreCase(F("Authorization")) && _base64Authorization.length())){
String headerLine = name;
headerLine += ": ";
if (replace) {
int headerStart = _headers.indexOf(headerLine);
if (headerStart != -1) {
int headerEnd = _headers.indexOf('\n', headerStart);
_headers = _headers.substring(0, headerStart) + _headers.substring(headerEnd + 1);
}
}
headerLine += value;
headerLine += "\r\n";
if(first) {
_headers = headerLine + _headers;
} else {
_headers += headerLine;
}
}
}
void HTTPClient::collectHeaders(const char* headerKeys[], const size_t headerKeysCount)
{
_headerKeysCount = headerKeysCount;
if(_currentHeaders) {
delete[] _currentHeaders;
}
_currentHeaders = new RequestArgument[_headerKeysCount];
for(size_t i = 0; i < _headerKeysCount; i++) {
_currentHeaders[i].key = headerKeys[i];
}
}
String HTTPClient::header(const char* name)
{
for(size_t i = 0; i < _headerKeysCount; ++i) {
if(_currentHeaders[i].key == name) {
return _currentHeaders[i].value;
}
}
return String();
}
String HTTPClient::header(size_t i)
{
if(i < _headerKeysCount) {
return _currentHeaders[i].value;
}
return String();
}
String HTTPClient::headerName(size_t i)
{
if(i < _headerKeysCount) {
return _currentHeaders[i].key;
}
return String();
}
int HTTPClient::headers()
{
return _headerKeysCount;
}
bool HTTPClient::hasHeader(const char* name)
{
for(size_t i = 0; i < _headerKeysCount; ++i) {
if((_currentHeaders[i].key == name) && (_currentHeaders[i].value.length() > 0)) {
return true;
}
}
return false;
}
/**
* init TCP connection and handle ssl verify if needed
* @return true if connection is ok
*/
bool HTTPClient::connect(void)
{
if(connected()) {
log_d("already connected, try reuse!");
while(_client->available() > 0) {
_client->read();
}
return true;
}
#ifdef HTTPCLIENT_1_1_COMPATIBLE
if(!_client) {
_tcpDeprecated = _transportTraits->create();
_client = _tcpDeprecated.get();
}
#endif
if (!_client) {
log_d("HTTPClient::begin was not called or returned error");
return false;
}
if(!_client->connect(_host.c_str(), _port, _connectTimeout)) {
log_d("failed connect to %s:%u", _host.c_str(), _port);
return false;
}
// set Timeout for WiFiClient and for Stream::readBytesUntil() and Stream::readStringUntil()
_client->setTimeout((_tcpTimeout + 500) / 1000);
log_d(" connected to %s:%u", _host.c_str(), _port);
#ifdef HTTPCLIENT_1_1_COMPATIBLE
if (_tcpDeprecated && !_transportTraits->verify(*_client, _host.c_str())) {
log_d("transport level verify failed");
_client->stop();
return false;
}
#endif
/*
#ifdef ESP8266
_client->setNoDelay(true);
#endif
*/
return connected();
}
/**
* sends HTTP request header
* @param type (GET, POST, ...)
* @return status
*/
bool HTTPClient::sendHeader(const char * type)
{
if(!connected()) {
return false;
}
String header = String(type) + " " + _uri + F(" HTTP/1.");
if(_useHTTP10) {
header += "0";
} else {
header += "1";
}
header += String(F("\r\nHost: ")) + _host;
if (_port != 80 && _port != 443)
{
header += ':';
header += String(_port);
}
header += String(F("\r\nUser-Agent: ")) + _userAgent +
F("\r\nConnection: ");
if(_reuse) {
header += F("keep-alive");
} else {
header += F("close");
}
header += "\r\n";
if(!_useHTTP10) {
header += F("Accept-Encoding: identity;q=1,chunked;q=0.1,*;q=0\r\n");
}
if(_base64Authorization.length()) {
_base64Authorization.replace("\n", "");
header += F("Authorization: Basic ");
header += _base64Authorization;
header += "\r\n";
}
header += _headers + "\r\n";
return (_client->write((const uint8_t *) header.c_str(), header.length()) == header.length());
}
/**
* reads the response from the server
* @return int http code
*/
int HTTPClient::handleHeaderResponse()
{
if(!connected()) {
return HTTPC_ERROR_NOT_CONNECTED;
}
_canReuse = !_useHTTP10;
String transferEncoding;
_returnCode = -1;
_size = -1;
_transferEncoding = HTTPC_TE_IDENTITY;
unsigned long lastDataTime = millis();
while(connected()) {
size_t len = _client->available();
if(len > 0) {
String headerLine = _client->readStringUntil('\n');
headerLine.trim(); // remove \r
lastDataTime = millis();
log_v("RX: '%s'", headerLine.c_str());
if(headerLine.startsWith("HTTP/1.")) {
_returnCode = headerLine.substring(9, headerLine.indexOf(' ', 9)).toInt();
_canReuse = (_returnCode != '0');
} else if(headerLine.indexOf(':')) {
String headerName = headerLine.substring(0, headerLine.indexOf(':'));
String headerValue = headerLine.substring(headerLine.indexOf(':') + 1);
headerValue.trim();
if(headerName.equalsIgnoreCase("Content-Length")) {
_size = headerValue.toInt();
}
if(headerName.equalsIgnoreCase("Connection")) {
_canReuse = headerValue.equalsIgnoreCase("keep-alive");
}
if(headerName.equalsIgnoreCase("Transfer-Encoding")) {
transferEncoding = headerValue;
}
for(size_t i = 0; i < _headerKeysCount; i++) {
if(_currentHeaders[i].key.equalsIgnoreCase(headerName)) {
_currentHeaders[i].value = headerValue;
break;
}
}
}
if(headerLine == "") {
log_d("code: %d", _returnCode);
if(_size > 0) {
log_d("size: %d", _size);
}
if(transferEncoding.length() > 0) {
log_d("Transfer-Encoding: %s", transferEncoding.c_str());
if(transferEncoding.equalsIgnoreCase("chunked")) {
_transferEncoding = HTTPC_TE_CHUNKED;
} else {
return HTTPC_ERROR_ENCODING;
}
} else {
_transferEncoding = HTTPC_TE_IDENTITY;
}
if(_returnCode) {
return _returnCode;
} else {
log_d("Remote host is not an HTTP Server!");
return HTTPC_ERROR_NO_HTTP_SERVER;
}
}
} else {
if((millis() - lastDataTime) > _tcpTimeout) {
return HTTPC_ERROR_READ_TIMEOUT;
}
delay(10);
}
}
return HTTPC_ERROR_CONNECTION_LOST;
}
/**
* write one Data Block to Stream
* @param stream Stream *
* @param size int
* @return < 0 = error >= 0 = size written
*/
int HTTPClient::writeToStreamDataBlock(Stream * stream, int size)
{
int buff_size = HTTP_TCP_BUFFER_SIZE;
int len = size;
int bytesWritten = 0;
// if possible create smaller buffer then HTTP_TCP_BUFFER_SIZE
if((len > 0) && (len < HTTP_TCP_BUFFER_SIZE)) {
buff_size = len;
}
// create buffer for read
uint8_t * buff = (uint8_t *) malloc(buff_size);
if(buff) {
// read all data from server
while(connected() && (len > 0 || len == -1)) {
// get available data size
size_t sizeAvailable = _client->available();
if(sizeAvailable) {
int readBytes = sizeAvailable;
// read only the asked bytes
if(len > 0 && readBytes > len) {
readBytes = len;
}
// not read more the buffer can handle
if(readBytes > buff_size) {
readBytes = buff_size;
}
// stop if no more reading
if (readBytes == 0)
break;
// read data
int bytesRead = _client->readBytes(buff, readBytes);
// write it to Stream
int bytesWrite = stream->write(buff, bytesRead);
bytesWritten += bytesWrite;
// are all Bytes a writen to stream ?
if(bytesWrite != bytesRead) {
log_d("short write asked for %d but got %d retry...", bytesRead, bytesWrite);
// check for write error
if(stream->getWriteError()) {
log_d("stream write error %d", stream->getWriteError());
//reset write error for retry
stream->clearWriteError();
}
// some time for the stream
delay(1);
int leftBytes = (readBytes - bytesWrite);
// retry to send the missed bytes
bytesWrite = stream->write((buff + bytesWrite), leftBytes);
bytesWritten += bytesWrite;
if(bytesWrite != leftBytes) {
// failed again
log_w("short write asked for %d but got %d failed.", leftBytes, bytesWrite);
free(buff);
return HTTPC_ERROR_STREAM_WRITE;
}
}
// check for write error
if(stream->getWriteError()) {
log_w("stream write error %d", stream->getWriteError());
free(buff);
return HTTPC_ERROR_STREAM_WRITE;
}
// count bytes to read left
if(len > 0) {
len -= readBytes;
}
delay(0);
} else {
delay(1);
}
}
free(buff);
log_d("connection closed or file end (written: %d).", bytesWritten);
if((size > 0) && (size != bytesWritten)) {
log_d("bytesWritten %d and size %d mismatch!.", bytesWritten, size);
return HTTPC_ERROR_STREAM_WRITE;
}
} else {
log_w("too less ram! need %d", HTTP_TCP_BUFFER_SIZE);
return HTTPC_ERROR_TOO_LESS_RAM;
}
return bytesWritten;
}
/**
* called to handle error return, may disconnect the connection if still exists
* @param error
* @return error
*/
int HTTPClient::returnError(int error)
{
if(error < 0) {
log_w("error(%d): %s", error, errorToString(error).c_str());
if(connected()) {
log_d("tcp stop");
_client->stop();
}
}
return error;
}
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