Add QR codes, link expiry, password protection, previews, audit trail and bulk operations

src/services/qr.rs

@@ -0,0 +1,58 @@
+//! QR code generation service.
+//!
+//! Generates QR codes on-demand as PNG or SVG. No files are stored on disk.
+
+use image::Luma;
+use qrcode::QrCode;
+use std::io::Cursor;
+
+/// Generate a QR code as a PNG byte vector.
+///
+/// The `url` is encoded into the QR matrix. The `size` parameter controls
+/// the pixel dimensions of the output image (default: 256).
+pub fn generate_qr_png(url: &str, size: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
+    let code = QrCode::new(url.as_bytes())?;
+    let image = code.render::<Luma<u8>>().min_dimensions(size, size).build();
+
+    let mut buf = Vec::new();
+    let mut cursor = Cursor::new(&mut buf);
+    image.write_to(&mut cursor, image::ImageFormat::Png)?;
+    Ok(buf)
+}
+
+/// Generate a QR code as an SVG string.
+pub fn generate_qr_svg(url: &str) -> Result<String, Box<dyn std::error::Error>> {
+    let code = QrCode::new(url.as_bytes())?;
+    let svg = code
+        .render::<qrcode::render::svg::Color>()
+        .min_dimensions(256, 256)
+        .build();
+    Ok(svg)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_qr_png_generation() {
+        let png = generate_qr_png("https://bzo.in/abc123", 256).unwrap();
+        assert!(!png.is_empty());
+        // PNG magic bytes
+        assert_eq!(&png[..4], &[0x89, b'P', b'N', b'G']);
+    }
+
+    #[test]
+    fn test_qr_svg_generation() {
+        let svg = generate_qr_svg("https://bzo.in/abc123").unwrap();
+        assert!(svg.contains("<svg"));
+        assert!(svg.contains("</svg>"));
+    }
+
+    #[test]
+    fn test_qr_long_url() {
+        let long_url = format!("https://example.com/{}", "a".repeat(500));
+        let png = generate_qr_png(&long_url, 512).unwrap();
+        assert!(!png.is_empty());
+    }
+}