feat(go): patch iaas/AreaID after generation to fix oneOf regex issue

.github/workflows/ci.yaml

@@ -4,7 +4,7 @@ on: [pull_request, workflow_dispatch]
 
 env:
   GO_VERSION_BUILD: "1.25"
-  JAVA_VERSION: "11"
+  JAVA_VERSION: "25"
 
 jobs:
   main-go:

CustomRegionGenerator.java

@@ -5,11 +5,28 @@
 
 import org.openapitools.codegen.CodegenParameter;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.security.MessageDigest;
+import java.util.HashMap;
+import java.util.HexFormat;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
 import java.util.Set;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.parameters.Parameter;
 
 public class CustomRegionGenerator extends GoClientCodegen {
+    private final static String NAMESPACE = "cloud/stackit/codegen/";
+    private final Map<String, OverrideConfig> overrides;
 
     @Override
     public String getName() {
@@ -20,6 +37,14 @@ public String getName() {
     public CustomRegionGenerator() {
         super();
         System.out.println("=== CUSTOM GO CLIENT GENERATOR INITIALIZED ===");
+        try {
+            overrides = OverrideConfig.load().stream().collect(Collectors.toMap(
+                    o -> o.path,
+                    Function.identity()
+            ));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
@@ -68,4 +93,64 @@ private boolean isRegionField(String name) {
         }
         return name.equalsIgnoreCase("region") || name.equalsIgnoreCase("regionId");
     }
+
+    @Override
+    public void postProcessFile(File file, String fileType) {
+        var path = file.getAbsolutePath();
+        var servicesIdx = path.indexOf("/services/");
+        var subPath = path.substring(servicesIdx + "/services/".length());
+        if (overrides.containsKey(subPath)) {
+            var override = overrides.get(subPath);
+            try {
+                var content = Files.readAllBytes(file.toPath());
+                var digest = MessageDigest.getInstance("MD5");
+                var hex = HexFormat.of();
+                var hash = hex.formatHex(digest.digest(content));
+                if (hash.equals(override.hash)) {
+                    var replacementPath = Path.of(Thread.currentThread().getContextClassLoader().getResource(NAMESPACE + override.replacementPath).getPath());
+                    var replacementContent = Files.readAllBytes(replacementPath);
+                    Files.write(file.toPath(), replacementContent, StandardOpenOption.TRUNCATE_EXISTING);
+                } else {
+                    throw new IllegalStateException(
+                            "expected iaas/v2api/model_area_id.go to hash to " +
+                                    override.hash + " but got " + hash +
+                                    "\nedit CustomRegionGenerator.java in the sdk-generator and update IAAS_AREA_ID_HASH" +
+                                    "to accept this change"
+                    );
+                }
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+        super.postProcessFile(file, fileType);
+    }
+
+    private static class OverrideConfig {
+        public String name;
+        public String path;
+        public String replacementPath;
+        public String hash;
+
+        public static List<OverrideConfig> load() throws IOException {
+            var path = Thread.currentThread().getContextClassLoader().getResource(NAMESPACE + "overrides.properties").getPath();
+            var overrideProps = new Properties();
+            overrideProps.load(new FileInputStream(path));
+            var byName = new HashMap<String, OverrideConfig>();
+            overrideProps.stringPropertyNames().forEach(key -> {
+                var prefixLen = key.indexOf('.');
+                var prefix = key.substring(0, prefixLen);
+                var config = byName.computeIfAbsent(prefix, (_) -> new OverrideConfig());
+                config.name = prefix;
+                var suffix = key.substring(prefixLen + 1);
+                switch (suffix) {
+                    case "path" -> config.path = overrideProps.getProperty(key);
+                    case "replacementPath" -> config.replacementPath = overrideProps.getProperty(key);
+                    case "hash" -> config.hash = overrideProps.getProperty(key);
+                    default -> throw new IllegalStateException("unexpected suffix: " + suffix);
+                }
+            });
+            return byName.values().stream().toList();
+        }
+    }
+
 }

languages/golang/overrides/overrides.properties

@@ -0,0 +1,11 @@
+iaasV2ApiAreaId.path=iaas/v2api/model_area_id.go
+iaasV2ApiAreaId.replacementPath=v2api_model_area_id.go
+iaasV2ApiAreaId.hash=b7425456c4633b2e8c0a61e9ab3b579e
+
+iaasV1ApiAreaId.path=iaas/v1api/model_area_id.go
+iaasV1ApiAreaId.replacementPath=v1api_model_area_id.go
+iaasV1ApiAreaId.hash=a9d72364fec0794cab3b51f3680de584
+
+iaasV2BetaApiAreaId.path="iaas/v2beta1api/model_area_id.go
+iaasV2BetaApiAreaId.replacementPath=v2beta_model_area_id.go
+iaasV2BetaApiAreaId.hash=bb5583419348ee95ebbde0b4133a36f0