Fix #306 (quoting needed for field names with linefeeds)

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -194,3 +194,6 @@ Falk Hanisch (mrpiggi@github)
   for the same POJO
  (2.13.1)
 
+Esteban Ginez (eginez@github)
+#306: (yaml) Error when generating/serializing keys with multilines and colon
+ (2.13.2)

release-notes/VERSION-2.x

@@ -22,6 +22,8 @@ No changes since 2.13
 
 #303: (yaml) Update to SnakeYAML 1.30
  (suggested by PJ Fanning)
+#306: (yaml) Error when generating/serializing keys with multilines and colon
+ (reported by Esteban G)
 
 2.13.1 (19-Dec-2021)
 

yaml/src/main/java/com/fasterxml/jackson/dataformat/yaml/util/StringQuotingChecker.java

@@ -163,7 +163,27 @@ protected boolean valueHasQuotableChar(String inputStr)
         }
         return false;
     }
-    
+
+    /**
+     * Looks like we may get names with "funny characters" so.
+     *
+     * @since 2.13.2
+     */
+    protected boolean nameHasQuotableChar(String inputStr)
+    {
+        // 31-Jan-2022, tatu: As per [dataformats-text#306] linefeed is
+        //   problematic. I'm sure there are likely other cases, but let's
+        //   start with the obvious ones, control characters
+        final int end = inputStr.length();
+        for (int i = 0; i < end; ++i) {
+            int ch = inputStr.charAt(i);
+            if (ch < 0x0020) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     /**
      * Default {@link StringQuotingChecker} implementation used unless
      * custom implementation registered.
@@ -189,7 +209,10 @@ public Default() { }
         @Override
         public boolean needToQuoteName(String name)
         {
-            return isReservedKeyword(name) || looksLikeYAMLNumber(name);
+            return isReservedKeyword(name) || looksLikeYAMLNumber(name)
+                    // 31-Jan-2022, tatu: as per [dataformats-text#306] may also
+                    //   have other characters requiring quoting...
+                    || nameHasQuotableChar(name);
         }
 
         /**

yaml/src/test/java/com/fasterxml/jackson/dataformat/yaml/failing/NameQuoting306Test.java renamed to yaml/src/test/java/com/fasterxml/jackson/dataformat/yaml/deser/NameQuoting306Test.java

@@ -1,4 +1,4 @@
-package com.fasterxml.jackson.dataformat.yaml.failing;
+package com.fasterxml.jackson.dataformat.yaml.deser;
 
 import java.util.Collections;
 import java.util.Map;