[scala-sttp] Compilation failed when URI parameter name is not camelCase, fixes #9345 (#9354)

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaSttpClientCodegen.java

@@ -37,6 +37,8 @@ import java.io.IOException;
 import java.io.StringWriter;
 import java.io.Writer;
 import java.util.*;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import static org.openapitools.codegen.utils.StringUtils.camelize;
 
@@ -179,8 +181,17 @@ public class ScalaSttpClientCodegen extends AbstractScalaCodegen implements Code
 
     @Override
     public String encodePath(String input) {
-        String result = super.encodePath(input);
-        return result.replace("{", "${");
+        String path = super.encodePath(input);
+
+        // The parameter names in the URI must be converted to the same case as
+        // the method parameter.
+        StringBuffer buf = new StringBuffer(path.length());
+        Matcher matcher = Pattern.compile("[{](.*?)[}]").matcher(path);
+        while (matcher.find()) {
+            matcher.appendReplacement(buf, "\\${" + toParamName(matcher.group(0)) + "}");
+        }
+        matcher.appendTail(buf);
+        return buf.toString();
     }
 
     @Override

modules/openapi-generator/src/test/java/org/openapitools/codegen/scala/SttpCodegenTest.java

@@ -0,0 +1,20 @@
+package org.openapitools.codegen.scala;
+
+import org.openapitools.codegen.languages.ScalaSttpClientCodegen;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+public class SttpCodegenTest {
+
+    private final ScalaSttpClientCodegen codegen = new ScalaSttpClientCodegen();
+
+    @Test
+    public void encodePath() {
+        Assert.assertEquals(codegen.encodePath("{user_name}"), "${userName}");
+        Assert.assertEquals(codegen.encodePath("{userName}"), "${userName}");
+        Assert.assertEquals(codegen.encodePath("{UserName}"), "${userName}");
+        Assert.assertEquals(codegen.encodePath("user_name"), "user_name");
+        Assert.assertEquals(codegen.encodePath("before/{UserName}/after"), "before/${userName}/after");
+    }
+
+}