websockets.cpp

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// Code from https://github.com/gilmaimon/TinyWebsockets
#include <Arduino.h>
#include <utils/dcp.h>
#include <utils/etl_base64.h>
#include <utils/logging.h>
#include <web/websockets.h>
 
/*
 
  This can be manually unit tested with these two example fixtures
 
     websocketsHandshakeEncodeKey("dGhlIHNhbXBsZSBub25jZQ==") == "s3pPLMBiTxaQ9kYGzzhZRbK+xOo="
     websocketsHandshakeEncodeKey("x3JJHMbDL1EzLkh9GBhXDw==") == "HSmrc0sMlYUkAGmm5OPpG2HaGWk=");
 
  i.e. with curl:
 
      curl --verbose -H "Upgrade: websocket" -H "Connection: Upgrade" -H "Sec-Websocket-Version: 13"  -H
  "Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==" http://lucidac-17-40-f4.fritz.box/websocket
 
*/
FLASHMEM
std::string web::websocketsHandshakeEncodeKey(const char *key) {
  if (!key)
    return "";
 
  std::string input(key);
  input += "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
  utils::sha1 sha1((const uint8_t *)input.c_str(), input.size());
  //    LOGMEV("sha1('%s') = '%s'\n", key, sha1.to_string());
 
  char retkey[30 + 1] = {0};
  etl::base64::encode(sha1.checksum.data(), 20, retkey, 30);
 
  // LOGMEV("base64encode('%s') = '%s'\n", sha1.to_string(), retkey);
 
  return retkey;
}