Added QrCode renderer

lib/src/main/java/rife/render/QrCode.java

@@ -0,0 +1,59 @@
+/*
+ *  Copyright 2023 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+package rife.render;
+
+import rife.template.Template;
+import rife.template.ValueRenderer;
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.Properties;
+
+/**
+ * <p>Generates an SVG QR Code for a template value using <a href="https://goqr.me/">goQR.me</a>.</p>
+ *
+ * <p>Usage:</p>
+ *
+ * <pre>
+ *   &lt;!--v render:rife.render.QrCode:valueId/--&gt;
+ *   {{v render:rife.render.QrCode:valueId/}}
+ * </pre>
+ *
+ * @author <a href="https://erik.thauvin.net/">Erik C. Thauvin</a>
+ * @see <a href="https://github.com/rife2/rife2-template-renderers/wiki/rife.render.QrCode">rife.render.QrCode</a>
+ * @since 1.0
+ */
+public class QrCode implements ValueRenderer {
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String render(Template template, String valueId, String differentiator) {
+        var size = "150x150";
+        if (template.hasDefaultValue(valueId)) {
+            var properties = new Properties();
+            try {
+                properties.load(new StringReader(template.getDefaultValue(valueId)));
+                size = properties.getProperty("size", size);
+            } catch (IOException ignore) {
+                // do nothing
+            }
+        }
+        return RenderUtils.qrCode(template.getValueOrAttribute(differentiator), size);
+    }
+}

lib/src/main/java/rife/render/RenderUtils.java

@@ -129,8 +129,8 @@ public final class RenderUtils {
      * @return The normalized String
      */
     public static String normalize(String src) {
-        var sb = new StringBuilder(src.length());
         var normalized = Normalizer.normalize(src.trim(), Normalizer.Form.NFD);
+        var sb = new StringBuilder(normalized.length());
         boolean space = false;
         for (var c : normalized.toCharArray()) {
             if (c <= '\u007F') { // ascii only
@@ -166,6 +166,39 @@ public final class RenderUtils {
         }
     }
 
+    /**
+     * Generates an SVG QR Code from the given String using <a href="https://goqr.me/">goQR.me</a>.
+     *
+     * @param src  the data String
+     * @param size the QR Code size. (e.g. {@code 150x150})
+     * @return the QR code
+     */
+    public static String qrCode(String src, String size) {
+        if (src == null || src.isBlank()) {
+            return src;
+        }
+
+        var svg = src;
+        try {
+            var connection = (HttpURLConnection) new URL(
+                    String.format("https://api.qrserver.com/v1/create-qr-code/?format=svg&size=%s&data=%s", size,
+                            StringUtils.encodeUrl(src.trim())))
+                    .openConnection();
+            connection.setRequestProperty(
+                    "User-Agent", "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/111.0"
+            );
+            var responseCode = connection.getResponseCode();
+            if (responseCode >= 200 && responseCode <= 399) {
+                try (var inputStream = connection.getInputStream()) {
+                    svg = new String(inputStream.readAllBytes(), StandardCharsets.UTF_8);
+                }
+            }
+        } catch (IOException ignore) {
+            // do nothing
+        }
+        return svg;
+    }
+
     /**
      * Translates a String to/from ROT13.
      *
@@ -221,7 +254,7 @@ public final class RenderUtils {
         var shorten = url;
         try {
             var connection = (HttpURLConnection) new URL(
-                    String.format("https://is.gd/create.php?format=simple&url=%s", StringUtils.decodeUrl(url.trim())))
+                    String.format("https://is.gd/create.php?format=simple&url=%s", StringUtils.encodeUrl(url.trim())))
                     .openConnection();
             connection.setRequestProperty(
                     "User-Agent", "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/111.0"
@@ -385,5 +418,4 @@ public final class RenderUtils {
 
         return sb.toString();
     }
-
 }

lib/src/test/java/rife/render/TestFormat.java

@@ -45,6 +45,14 @@ class TestFormat {
                 + foo + "</a>");
     }
 
+    @Test
+    void testQrCode() {
+        var t = TemplateFactory.SVG.get("qrCode");
+        var foo = "https://example.com/";
+        t.setAttribute(TestCase.FOO, foo);
+        assertThat(t.getContent()).startsWith("<?xml").contains("<desc>" + foo + "</desc").contains("width=\"200\"");
+    }
+
     @Test
     void testShortenUrl() {
         var t = TemplateFactory.HTML.get("shortenUrl");

lib/src/test/resources/templates/qrCode.svg

@@ -0,0 +1 @@
+{{v render:rife.render.QrCode:foo}}size=200x200{{/v}}