Added backup options for firmware and filesystem partitions (no encryption support)

Author: mathieucarbou

embed/website.html

@@ -301,7 +301,7 @@ <h5 id="help_text">
     <div class="shadow_container">
 
       <div class="mode_switch_container" id="mode_switch_container">
-        <h4 id="label_firmware">Firmware</h4>
+        <h4 id="label_firmware">Firmware (<a id="label_firmware_backup" href="/backup/fw">backup</a>)</h4>
         <div class="toggle_switch_container">
           <input
             type="checkbox"
@@ -312,7 +312,7 @@ <h4 id="label_firmware">Firmware</h4>
             <span class="toggle_switch_slider"></span>
           </label>
         </div>
-        <h4 id="label_filesystem">File System</h4>
+        <h4 id="label_filesystem">File System (<a id="label_filesystem_backup" href="/backup/fs">backup</a>)</h4>
       </div>
 
       <div class="drop_zone" id="drop_zone">
@@ -426,7 +426,9 @@ <h6 id="clickable_file_input">or<br />click to select (.bin) file</h6>
         "clickable_file_input"
       );
       const label_firmware = document.getElementById("label_firmware");
+      const label_firmware_backup = document.getElementById("label_firmware_backup");
       const label_filesystem = document.getElementById("label_filesystem");
+      const label_filesystem_backup = document.getElementById("label_filesystem_backup");
       const mode_container = document.getElementById("mode_switch_container");
       const mode_checkbox = document.getElementById("toggle_switch_checkbox");
       const info_text_chipspecs = document.getElementById(
@@ -482,14 +484,19 @@ <h6 id="clickable_file_input">or<br />click to select (.bin) file</h6>
       getInfos();
 
       label_firmware.style.color = "black";
+      label_firmware_backup.style.color = "black";
 
       mode_checkbox.addEventListener("change", function () {
         if (mode_checkbox.checked) {
           label_firmware.style.color = "gray";
+          label_firmware_backup.style.color = "gray";
           label_filesystem.style.color = "black";
+          label_filesystem_backup.style.color = "black";
         } else {
           label_firmware.style.color = "black";
+          label_firmware_backup.style.color = "black";
           label_filesystem.style.color = "gray";
+          label_filesystem_backup.style.color = "gray";
         }
       });
 

src/main.cpp

@@ -43,6 +43,31 @@ static String getChipIDStr() {
   return espId;
 }
 
+static void sendPartition(const esp_partition_t* partition) {
+  webServer.setContentLength(partition->size);
+  webServer.sendHeader("Content-Disposition", "attachment; filename=" + String(partition->label) + ".bin");
+  webServer.send(200, "application/octet-stream", "");
+
+  uint8_t* buffer = new uint8_t[4094];
+  uint32_t index = 0;
+
+  while (index < partition->size) {
+    size_t len = partition->size - index;
+    if (len > 4094)
+      len = 4094;
+    if (esp_partition_read(partition, index, buffer, len) == ESP_OK) {
+      webServer.client().write(buffer, len);
+      index += len;
+    } else {
+      webServer.send(500, "text/plain", "Cannot read partition");
+      delete[] buffer;
+      return;
+    }
+  }
+
+  delete[] buffer;
+}
+
 static void start_web_server() {
   webServer.onNotFound([]() {
     webServer.sendHeader("Location", "/");
@@ -76,6 +101,24 @@ static void start_web_server() {
     webServer.send_P(200, "text/html", reinterpret_cast<const char*>(update_html_start), update_html_end - update_html_start);
   });
 
+  webServer.on("/backup/fw", HTTP_GET, [&]() {
+    const esp_partition_t* partition = esp_ota_get_running_partition();
+    if (!partition) {
+      webServer.send(500, "text/plain", "Cannot find running partition");
+      return;
+    }
+    sendPartition(partition);
+  });
+
+  webServer.on("/backup/fs", HTTP_GET, [&]() {
+    const esp_partition_t* partition = esp_partition_find_first(esp_partition_type_t::ESP_PARTITION_TYPE_DATA, esp_partition_subtype_t::ESP_PARTITION_SUBTYPE_DATA_SPIFFS, nullptr);
+    if (!partition) {
+      webServer.send(500, "text/plain", "Cannot find SPIFFS partition");
+      return;
+    }
+    sendPartition(partition);
+  });
+
   webServer.on(
     "/",
     HTTP_POST,