PaperMC/paper-server/patches/sources/net/minecraft/resources/ResourceLocation.java.patch

--- a/net/minecraft/resources/ResourceLocation.java
+++ b/net/minecraft/resources/ResourceLocation.java
@@ -32,6 +32,7 @@
     public static final char NAMESPACE_SEPARATOR = ':';
     public static final String DEFAULT_NAMESPACE = "minecraft";
     public static final String REALMS_NAMESPACE = "realms";
+    public static final String PAPER_NAMESPACE = "paper"; // Paper
     private final String namespace;
     private final String path;
 
@@ -40,6 +41,13 @@
 
         assert isValidPath(path);
 
+        // Paper start - Validate ResourceLocation
+        // Check for the max network string length (capped at Short.MAX_VALUE) as well as the max bytes of a StringTag (length written as an unsigned short)
+        final String resourceLocation = namespace + ":" + path;
+        if (resourceLocation.length() > Short.MAX_VALUE || io.netty.buffer.ByteBufUtil.utf8MaxBytes(resourceLocation) > 2 * Short.MAX_VALUE + 1) {
+            throw new ResourceLocationException("Resource location too long: " + resourceLocation);
+        }
+        // Paper end - Validate ResourceLocation
         this.namespace = namespace;
         this.path = path;
     }
@@ -246,7 +254,7 @@
 
     private static String assertValidNamespace(String namespace, String path) {
         if (!isValidNamespace(namespace)) {
-            throw new ResourceLocationException("Non [a-z0-9_.-] character in namespace of location: " + namespace + ":" + path);
+            throw new ResourceLocationException("Non [a-z0-9_.-] character in namespace of location: " + org.apache.commons.lang3.StringUtils.normalizeSpace(namespace) + ":" + org.apache.commons.lang3.StringUtils.normalizeSpace(path)); // Paper - Sanitize ResourceLocation error logging
         } else {
             return namespace;
         }
@@ -267,7 +275,7 @@
 
     private static String assertValidPath(String namespace, String path) {
         if (!isValidPath(path)) {
-            throw new ResourceLocationException("Non [a-z0-9/._-] character in path of location: " + namespace + ":" + path);
+            throw new ResourceLocationException("Non [a-z0-9/._-] character in path of location: " + namespace + ":" + org.apache.commons.lang3.StringUtils.normalizeSpace(path)); // Paper - Sanitize ResourceLocation error logging
         } else {
             return path;
         }