Implement local web server on SoftAP for uploading PNG/MP3/WAV files directly to SD card

sound_picture_app/Web_Server.cpp

@@ -0,0 +1,148 @@
+#include "Web_Server.h"
+#include <WiFi.h>
+#include <WebServer.h>
+#include "SD_Card.h"
+#include "Display_PNG.h"
+#include "Audio_Player.h"
+
+WebServer server(80);
+File uploadFile;
+
+const char* uploadPage = R"rawliteral(
+<!DOCTYPE html>
+<html>
+<head>
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Photo Upload Panel</title>
+  <style>
+    body {
+      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+      background: linear-gradient(135deg, #0f172a, #1e293b);
+      color: #f8fafc;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+      height: 100vh;
+      margin: 0;
+    }
+    .card {
+      background: rgba(30, 41, 59, 0.7);
+      backdrop-filter: blur(10px);
+      border: 1px solid rgba(255, 255, 255, 0.1);
+      border-radius: 16px;
+      padding: 32px;
+      width: 90%;
+      max-width: 400px;
+      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
+      text-align: center;
+    }
+    h1 { font-size: 24px; margin-bottom: 24px; color: #38bdf8; }
+    .input-group { margin-bottom: 20px; }
+    input[type="file"] { display: none; }
+    .file-label {
+      display: inline-block;
+      padding: 12px 24px;
+      background: #0284c7;
+      color: white;
+      border-radius: 8px;
+      cursor: pointer;
+      font-weight: 600;
+      transition: background 0.2s;
+    }
+    .file-label:hover { background: #0369a1; }
+    button {
+      width: 100%;
+      padding: 12px;
+      background: #10b981;
+      color: white;
+      border: none;
+      border-radius: 8px;
+      font-size: 16px;
+      font-weight: 600;
+      cursor: pointer;
+      transition: background 0.2s;
+      margin-top: 10px;
+    }
+    button:hover { background: #059669; }
+    #status { margin-top: 15px; font-size: 14px; color: #94a3b8; }
+  </style>
+</head>
+<body>
+  <div class="card">
+    <h1>Upload Photo / Audio</h1>
+    <form method="POST" action="/upload" enctype="multipart/form-data" id="uploadForm">
+      <div class="input-group">
+        <label for="file" class="file-label">Choose File (.png / .mp3 / .wav)</label>
+        <input type="file" id="file" name="file" accept=".png,.mp3,.wav" onchange="updateFilename()">
+      </div>
+      <div id="filename" style="margin-bottom: 20px; font-size: 14px; color: #38bdf8;">No file selected</div>
+      <button type="submit">Upload to Frame</button>
+    </form>
+    <div id="status">Supports PNG (172x320 max) and MP3/WAV.</div>
+  </div>
+  <script>
+    function updateFilename() {
+      const fileInput = document.getElementById('file');
+      const filenameDiv = document.getElementById('filename');
+      if (fileInput.files.length > 0) {
+        filenameDiv.textContent = fileInput.files[0].name;
+      } else {
+        filenameDiv.textContent = 'No file selected';
+      }
+    }
+  </script>
+</body>
+</html>
+)rawliteral";
+
+void handleUpload() {
+  HTTPUpload& upload = server.upload();
+  if (upload.status == UPLOAD_FILE_START) {
+    String filename = upload.filename;
+    if (!filename.startsWith("/")) {
+      filename = "/" + filename;
+    }
+    printf("WebUpload: Starting upload of %s\r\n", filename.c_str());
+    uploadFile = SD_MMC.open(filename, "w");
+  } 
+  else if (upload.status == UPLOAD_FILE_WRITE) {
+    if (uploadFile) {
+      uploadFile.write(upload.buf, upload.currentSize);
+    }
+  } 
+  else if (upload.status == UPLOAD_FILE_END) {
+    if (uploadFile) {
+      uploadFile.close();
+      printf("WebUpload: Successfully uploaded %s (%d bytes)\r\n", upload.filename.c_str(), upload.totalSize);
+      // Re-scan SD card folders to index the new file
+      Search_Images("/");
+      Search_Audio("/");
+    }
+  }
+}
+
+void initWebServer() {
+  // Start WiFi Access Point
+  WiFi.softAP("ESP32-Photo-Frame");
+  IPAddress IP = WiFi.softAPIP();
+  printf("WiFi AP Started. SSID: 'ESP32-Photo-Frame'\r\n");
+  printf("Web Server IP address: %s\r\n", IP.toString().c_str());
+  
+  // Serve Page
+  server.on("/", HTTP_GET, []() {
+    server.send(200, "text/html", uploadPage);
+  });
+  
+  // Handle file uploads
+  server.on("/upload", HTTP_POST, []() {
+    // Redirect back to main upload page on success
+    server.sendHeader("Location", "/");
+    server.send(303);
+  }, handleUpload);
+  
+  server.begin();
+}
+
+void handleWebServer() {
+  server.handleClient();
+}