diff --git a/app/src/main/java/com/bitchat/android/hotspot/QrCodeGenerator.kt b/app/src/main/java/com/bitchat/android/hotspot/QrCodeGenerator.kt new file mode 100644 index 00000000..69c2bdf1 --- /dev/null +++ b/app/src/main/java/com/bitchat/android/hotspot/QrCodeGenerator.kt @@ -0,0 +1,126 @@ +package com.bitchat.android.hotspot + +import android.graphics.Bitmap +import android.util.Log +import androidx.core.graphics.createBitmap +import androidx.core.graphics.set +import com.google.zxing.BarcodeFormat +import com.google.zxing.common.BitMatrix +import com.google.zxing.qrcode.QRCodeWriter + +/** + * Utility for generating QR codes for Wi-Fi connection and URL. + */ +object QrCodeGenerator { + + private const val TAG = "QrCodeGenerator" + + /** + * Generate QR code for Wi-Fi connection. + * Format: WIFI:S:{SSID};T:WPA;P:{PASSWORD};; + * + * This format is recognized by most Android/iOS devices for instant Wi-Fi connection. + * + * @param ssid Wi-Fi network name + * @param password Wi-Fi password + * @param sizePx Size of the QR code in pixels + * @return Bitmap of the QR code, or null on error + */ + fun generateWifiQr(ssid: String, password: String, sizePx: Int): Bitmap? { + if (ssid.isBlank() || password.isBlank()) { + Log.w(TAG, "SSID or password is blank") + return null + } + + // Escape special characters + val escapedSsid = escapeWifiString(ssid) + val escapedPassword = escapeWifiString(password) + + // Format: WIFI:S:{SSID};T:WPA;P:{PASSWORD};; + val wifiString = "WIFI:S:$escapedSsid;T:WPA;P:$escapedPassword;;" + + Log.d(TAG, "Generating Wi-Fi QR code for SSID: $ssid") + + return generateQrBitmap(wifiString, sizePx) + } + + /** + * Generate QR code for URL. + * + * @param url Website URL (e.g., "http://192.168.49.1:9999") + * @param sizePx Size of the QR code in pixels + * @return Bitmap of the QR code, or null on error + */ + fun generateUrlQr(url: String, sizePx: Int): Bitmap? { + if (url.isBlank()) { + Log.w(TAG, "URL is blank") + return null + } + + Log.d(TAG, "Generating URL QR code: $url") + + return generateQrBitmap(url, sizePx) + } + + /** + * Generate QR code bitmap from string data. + * + * @param data String data to encode + * @param sizePx Size of the QR code in pixels + * @return Bitmap of the QR code, or null on error + */ + private fun generateQrBitmap(data: String, sizePx: Int): Bitmap? { + if (data.isBlank() || sizePx <= 0) { + Log.w(TAG, "Invalid data or size: data.length=${data.length}, sizePx=$sizePx") + return null + } + + return try { + val matrix = QRCodeWriter().encode( + data, + BarcodeFormat.QR_CODE, + sizePx, + sizePx + ) + bitmapFromMatrix(matrix) + } catch (e: Exception) { + Log.e(TAG, "Error generating QR code", e) + null + } + } + + /** + * Convert BitMatrix to Bitmap. + * Pattern from VerificationSheet.kt. + */ + private fun bitmapFromMatrix(matrix: BitMatrix): Bitmap { + val width = matrix.width + val height = matrix.height + val bitmap = createBitmap(width, height) + + for (x in 0 until width) { + for (y in 0 until height) { + bitmap[x, y] = if (matrix[x, y]) { + android.graphics.Color.BLACK + } else { + android.graphics.Color.WHITE + } + } + } + + return bitmap + } + + /** + * Escape special characters in Wi-Fi SSID/password for QR code format. + * Special characters that need escaping: \ ; , " : + */ + private fun escapeWifiString(input: String): String { + return input + .replace("\\", "\\\\") // Backslash must be escaped first + .replace(";", "\\;") + .replace(",", "\\,") + .replace("\"", "\\\"") + .replace(":", "\\:") + } +}