From 23df30be5491b76d3caf07b4015225a18bfbbaea Mon Sep 17 00:00:00 2001
From: Sven-Hendrik Haase <svenstaro@gmail.com>
Date: Wed, 25 Aug 2021 04:50:12 +0200
Subject: Upgrade qrcodegen (fixes #568)

---
 src/listing.rs | 35 +++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/listing.rs b/src/listing.rs
index 43cfb0e..ef2ed8b 100644
--- a/src/listing.rs
+++ b/src/listing.rs
@@ -244,9 +244,9 @@ pub fn directory_listing(
         let res = match QrCode::encode_text(&url, QrCodeEcc::Medium) {
             Ok(qr) => HttpResponse::Ok()
                 .header("Content-Type", "image/svg+xml")
-                .body(qr.to_svg_string(2)),
+                .body(qr_to_svg_string(&qr, 2)),
             Err(err) => {
-                log::error!("URL is too long: {:?}", err);
+                log::error!("URL is invalid (too long?): {:?}", err);
                 HttpResponse::UriTooLong().body(Body::Empty)
             }
         };
@@ -452,3 +452,34 @@ pub fn extract_query_parameters(req: &HttpRequest) -> QueryParameters {
         }
     }
 }
+
+// Returns a string of SVG code for an image depicting
+// the given QR Code, with the given number of border modules.
+// The string always uses Unix newlines (\n), regardless of the platform.
+fn qr_to_svg_string(qr: &QrCode, border: i32) -> String {
+    assert!(border >= 0, "Border must be non-negative");
+    let mut result = String::new();
+    result += "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
+    result += "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n";
+    let dimension = qr
+        .size()
+        .checked_add(border.checked_mul(2).unwrap())
+        .unwrap();
+    result += &format!(
+		"<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 {0} {0}\" stroke=\"none\">\n", dimension);
+    result += "\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n";
+    result += "\t<path d=\"";
+    for y in 0..qr.size() {
+        for x in 0..qr.size() {
+            if qr.get_module(x, y) {
+                if x != 0 || y != 0 {
+                    result += " ";
+                }
+                result += &format!("M{},{}h1v1h-1z", x + border, y + border);
+            }
+        }
+    }
+    result += "\" fill=\"#000000\"/>\n";
+    result += "</svg>\n";
+    result
+}
-- 
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