feat: adding possibility to manually set MD5 checksum for HTTP update

Author: vlastahajek

libraries/HTTPUpdate/src/HTTPUpdate.cpp

@@ -33,15 +33,15 @@
 // To do extern "C" uint32_t _SPIFFS_end;
 
 HTTPUpdate::HTTPUpdate(void)
-        : _httpClientTimeout(8000), _ledPin(-1)
+        : HTTPUpdate(8000)
 {
-    _followRedirects = HTTPC_DISABLE_FOLLOW_REDIRECTS;
 }
 
 HTTPUpdate::HTTPUpdate(int httpClientTimeout)
         : _httpClientTimeout(httpClientTimeout), _ledPin(-1)
 {
     _followRedirects = HTTPC_DISABLE_FOLLOW_REDIRECTS;
+    _md5Sum = String();
 }
 
 HTTPUpdate::~HTTPUpdate(void)
@@ -240,8 +240,14 @@ HTTPUpdateResult HTTPUpdate::handleUpdate(HTTPClient& http, const String& curren
     log_d(" - code: %d\n", code);
     log_d(" - len: %d\n", len);
 
-    if(http.hasHeader("x-MD5")) {
-        log_d(" - MD5: %s\n", http.header("x-MD5").c_str());
+    String md5;
+    if (_md5Sum.length()) {
+        md5 = _md5Sum; 
+    } else if(http.hasHeader("x-MD5")) {
+        md5 = http.header("x-MD5");
+    }
+    if(md5.length()) {
+        log_d(" - MD5: %s\n",md5.c_str());
     }
 
     log_d("ESP32 info:\n");
@@ -338,7 +344,7 @@ HTTPUpdateResult HTTPUpdate::handleUpdate(HTTPClient& http, const String& curren
                     }
 */
                 }
-                if(runUpdate(*tcp, len, http.header("x-MD5"), command)) {
+                if(runUpdate(*tcp, len, md5, command)) {
                     ret = HTTP_UPDATE_OK;
                     log_d("Update ok\n");
                     http.end();

libraries/HTTPUpdate/src/HTTPUpdate.h

@@ -84,6 +84,11 @@ class HTTPUpdate
         _ledOn = ledOn;
     }
 
+    void setMD5sum(const String &md5Sum) 
+    {
+        _md5Sum = md5Sum;
+    }
+
     t_httpUpdate_return update(WiFiClient& client, const String& url, const String& currentVersion = "");
 
     t_httpUpdate_return update(WiFiClient& client, const String& host, uint16_t port, const String& uri = "/",
@@ -121,6 +126,7 @@ class HTTPUpdate
 private:
     int _httpClientTimeout;
     followRedirects_t _followRedirects;
+    String _md5Sum;
 
     // Callbacks
     HTTPUpdateStartCB    _cbStart;