From 98ee431d1fb3303abadfe090943a819d7cb31628 Mon Sep 17 00:00:00 2001
From: "brian.mulier" <bmmulier@hotmail.fr>
Date: Tue, 10 Sep 2024 15:46:54 +0200
Subject: [PATCH] feat(webserver): Purge system flow created from blueprint at
 startup

closes #4878
---
 .../io/kestra/core/utils/NamespaceUtils.java  |  3 +++
 .../services/FlowAutoLoaderService.java       | 20 +++++++++++++++----
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/core/src/main/java/io/kestra/core/utils/NamespaceUtils.java b/core/src/main/java/io/kestra/core/utils/NamespaceUtils.java
index 062afd6d15..26cd2dc1de 100644
--- a/core/src/main/java/io/kestra/core/utils/NamespaceUtils.java
+++ b/core/src/main/java/io/kestra/core/utils/NamespaceUtils.java
@@ -5,9 +5,12 @@
 import lombok.Getter;
 
 import java.util.*;
+import java.util.regex.Pattern;
 
 @Singleton
 public class NamespaceUtils {
+    public static final Pattern NAMESPACE_FROM_FLOW_SOURCE_PATTERN = Pattern.compile("^namespace: \\S*", Pattern.MULTILINE);
+
     public static final String SYSTEM_FLOWS_DEFAULT_NAMESPACE = "system";
 
     @Getter
diff --git a/webserver/src/main/java/io/kestra/webserver/services/FlowAutoLoaderService.java b/webserver/src/main/java/io/kestra/webserver/services/FlowAutoLoaderService.java
index 5d0f40b074..b940687f43 100644
--- a/webserver/src/main/java/io/kestra/webserver/services/FlowAutoLoaderService.java
+++ b/webserver/src/main/java/io/kestra/webserver/services/FlowAutoLoaderService.java
@@ -4,6 +4,7 @@
 import io.kestra.core.repositories.FlowRepositoryInterface;
 import io.kestra.core.serializers.YamlFlowParser;
 import io.kestra.core.services.PluginDefaultService;
+import io.kestra.core.utils.NamespaceUtils;
 import io.kestra.webserver.annotation.WebServerEnabled;
 import io.kestra.webserver.controllers.api.BlueprintController.BlueprintItem;
 import io.kestra.webserver.controllers.api.BlueprintController.BlueprintTagItem;
@@ -22,6 +23,7 @@
 import reactor.core.publisher.Mono;
 
 import java.util.Collection;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Function;
 
@@ -32,9 +34,10 @@
 @WebServerEnabled
 @Requires(property = "kestra.tutorial-flows.enabled", value = "true", defaultValue = "true")
 public class FlowAutoLoaderService {
-
     private static final Logger log = LoggerFactory.getLogger(FlowAutoLoaderService.class);
 
+    public static final String PURGE_SYSTEM_FLOW_BLUEPRINT_ID = "234";
+
     @Inject
     protected FlowRepositoryInterface repository;
 
@@ -48,6 +51,9 @@ public class FlowAutoLoaderService {
     @Inject
     private YamlFlowParser yamlFlowParser;
 
+    @Inject
+    private NamespaceUtils namespaceUtils;
+
     @SuppressWarnings("unchecked")
     public void load() {
         // Gets the tag ID for 'Getting Started'.
@@ -78,13 +84,19 @@ public void load() {
                     ))
                 .map(response -> ((PagedResults<BlueprintItem>)response.body()).getResults())
                 .flatMapIterable(Function.identity())
-                .flatMap(it -> httpClient
+                .mergeWith(Mono.just(BlueprintItem.builder().id(PURGE_SYSTEM_FLOW_BLUEPRINT_ID).build()))
+                .flatMap(it -> Mono.from(httpClient
                     .exchange(
                         HttpRequest.create(HttpMethod.GET, "/v1/blueprints/" + it.getId() + "/flow"),
                         Argument.STRING
-                    )
+                    )).mapNotNull(response -> {
+                        String body = response.body();
+                        if (it.getId().equals(PURGE_SYSTEM_FLOW_BLUEPRINT_ID)) {
+                            return NamespaceUtils.NAMESPACE_FROM_FLOW_SOURCE_PATTERN.matcher(Objects.requireNonNull(body)).replaceFirst("namespace: " + namespaceUtils.getSystemFlowNamespace());
+                        }
+                        return body;
+                    })
                 )
-                .map(HttpResponse::body)
                 .map(source -> {
                     Flow flow = yamlFlowParser.parse(source, Flow.class);
                     repository.create(flow, source, pluginDefaultService.injectDefaults(flow));