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

CustomRegionGenerator.java

@@ -5,6 +5,11 @@
 
 import org.openapitools.codegen.CodegenParameter;
 
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.security.MessageDigest;
+import java.util.Arrays;
 import java.util.Set;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.parameters.Parameter;
@@ -68,4 +73,197 @@ private boolean isRegionField(String name) {
         }
         return name.equalsIgnoreCase("region") || name.equalsIgnoreCase("regionId");
     }
+    private final byte[] IAAS_AREA_ID_HASH = {-73, 66, 84, 86, -60, 99, 59, 46, -116, 10, 97, -23, -85, 59, 87, -98};
+    private final String IAAS_AREA_ID_PATCHED = """
+/*
+STACKIT IaaS API
+
+This API allows you to create and modify IaaS resources.
+
+API version: 2
+Contact: stackit-iaas@mail.schwarz
+*/
+
+// Code generated by OpenAPI Generator (https://openapi-generator.tech); DO NOT EDIT.
+
+package v2api
+
+import (
+	"encoding/json"
+	"fmt"
+	"regexp"
+)
+
+// AreaId - The identifier (ID) of an area.
+type AreaId struct {
+	StaticAreaID *StaticAreaID
+	String       *string
+}
+
+// StaticAreaIDAsAreaId is a convenience function that returns StaticAreaID wrapped in AreaId
+func StaticAreaIDAsAreaId(v *StaticAreaID) AreaId {
+	return AreaId{
+		StaticAreaID: v,
+	}
+}
+
+// stringAsAreaId is a convenience function that returns string wrapped in AreaId
+func StringAsAreaId(v *string) AreaId {
+	return AreaId{
+		String: v,
+	}
+}
+
+// Unmarshal JSON data into one of the pointers in the struct
+func (dst *AreaId) UnmarshalJSON(data []byte) error {
+	var err error
+	match := 0
+	// try to unmarshal data into StaticAreaID
+	err = json.Unmarshal(data, &dst.StaticAreaID)
+	if err == nil {
+		jsonStaticAreaID, _ := json.Marshal(dst.StaticAreaID)
+		if string(jsonStaticAreaID) == "{}" { // empty struct
+			dst.StaticAreaID = nil
+		} else {
+			match++
+		}
+	} else {
+		dst.StaticAreaID = nil
+	}
+
+	// try to unmarshal data into String
+	err = json.Unmarshal(data, &dst.String)
+	if err == nil {
+		jsonString, _ := json.Marshal(dst.String)
+        regex := `/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/`
+        regex = regexp.MustCompile("^\\\\/|\\\\/$").ReplaceAllString(regex, "$1")               // Remove beginning slash and ending slash
+        regex = regexp.MustCompile("\\\\\\\\(.)").ReplaceAllString(regex, "$1")                 // Remove duplicate escaping char for dots
+        rawString := regexp.MustCompile(`^"|"$`).ReplaceAllString(*dstAreaId1.String, "$1") // Remove quotes
+        isMatched, _ := regexp.MatchString(regex, rawString)
+        if string(jsonString) != "{}" && isMatched { // empty struct
+			dst.String = nil
+		} else {
+			match++
+		}
+	} else {
+		dst.String = nil
+	}
+
+	if match > 1 { // more than 1 match
+		// reset to nil
+		dst.StaticAreaID = nil
+		dst.String = nil
+
+		return fmt.Errorf("data matches more than one schema in oneOf(AreaId)")
+	} else if match == 1 {
+		return nil // exactly one match
+	} else { // no match
+		return fmt.Errorf("data failed to match schemas in oneOf(AreaId)")
+	}
+}
+
+// Marshal data from the first non-nil pointers in the struct to JSON
+func (src AreaId) MarshalJSON() ([]byte, error) {
+	if src.StaticAreaID != nil {
+		return json.Marshal(&src.StaticAreaID)
+	}
+
+	if src.String != nil {
+		return json.Marshal(&src.String)
+	}
+
+	return nil, nil // no data in oneOf schemas
+}
+
+// Get the actual instance
+func (obj *AreaId) GetActualInstance() interface{} {
+	if obj == nil {
+		return nil
+	}
+	if obj.StaticAreaID != nil {
+		return obj.StaticAreaID
+	}
+
+	if obj.String != nil {
+		return obj.String
+	}
+
+	// all schemas are nil
+	return nil
+}
+
+// Get the actual instance value
+func (obj AreaId) GetActualInstanceValue() interface{} {
+	if obj.StaticAreaID != nil {
+		return *obj.StaticAreaID
+	}
+
+	if obj.String != nil {
+		return *obj.String
+	}
+
+	// all schemas are nil
+	return nil
+}
+
+type NullableAreaId struct {
+	value *AreaId
+	isSet bool
+}
+
+func (v NullableAreaId) Get() *AreaId {
+	return v.value
+}
+
+func (v *NullableAreaId) Set(val *AreaId) {
+	v.value = val
+	v.isSet = true
+}
+
+func (v NullableAreaId) IsSet() bool {
+	return v.isSet
+}
+
+func (v *NullableAreaId) Unset() {
+	v.value = nil
+	v.isSet = false
+}
+
+func NewNullableAreaId(val *AreaId) *NullableAreaId {
+	return &NullableAreaId{value: val, isSet: true}
+}
+
+func (v NullableAreaId) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.value)
+}
+
+func (v *NullableAreaId) UnmarshalJSON(src []byte) error {
+	v.isSet = true
+	return json.Unmarshal(src, &v.value)
+}
+""";
+
+    @Override
+    public void postProcessFile(File file, String fileType) {
+        if (file.getAbsolutePath().endsWith("iaas/v2api/model_area_id.go")) {
+            try {
+                var content = Files.readAllBytes(file.toPath());
+                var digest = MessageDigest.getInstance("MD5");
+                var hash = digest.digest(content);
+                if (Arrays.equals(hash, IAAS_AREA_ID_HASH)) {
+                    Files.writeString(file.toPath(), IAAS_AREA_ID_PATCHED, StandardOpenOption.TRUNCATE_EXISTING);
+                } else {
+                    throw new IllegalStateException(
+                            "expected iaas/v2api/model_area_id.go to hash to " +
+                                    Arrays.toString(IAAS_AREA_ID_HASH) + " but got " + Arrays.toString(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);
+    }
 }