Check whether stdout is a real console (#79981)

Adds a new "ConsoleLoader" that uses jANSI in a separate classloader
to determine whether standard output is a real console (that is, not
redirected to a file or /dev/null, etc)

Also updates security auto-configuration to only print out credentials
when there is a console.

Backport of: #79882

Co-authored-by: Elastic Machine <[email protected]>

Author: tvernum

distribution/build.gradle

@@ -264,7 +264,7 @@ configure(subprojects.findAll { ['archives', 'packages'].contains(it.name) }) {
    *             Properties to expand when copying packaging files             *
    *****************************************************************************/
   configurations {
-    ['libs', 'libsPluginCli', 'libsKeystoreCli', 'libsSecurityCli', 'libsGeoIpCli'].each {
+    ['libs', 'libsPluginCli', 'libsKeystoreCli', 'libsSecurityCli', 'libsGeoIpCli', 'libsAnsiConsole'].each {
       create(it) {
         canBeConsumed = false
         canBeResolved = true
@@ -282,6 +282,7 @@ configure(subprojects.findAll { ['archives', 'packages'].contains(it.name) }) {
     libs project(':distribution:tools:java-version-checker')
     libs project(':distribution:tools:launchers')
 
+    libsAnsiConsole project(':distribution:tools:ansi-console')
     libsPluginCli project(':distribution:tools:plugin-cli')
     libsKeystoreCli project(path: ':distribution:tools:keystore-cli')
     libsSecurityCli project(':x-pack:plugin:security:cli')
@@ -309,6 +310,9 @@ configure(subprojects.findAll { ['archives', 'packages'].contains(it.name) }) {
         into('tools/security-cli') {
           from(configurations.libsSecurityCli)
         }
+        into('tools/ansi-console') {
+          from(configurations.libsAnsiConsole)
+        }
       }
 
 

distribution/tools/ansi-console/build.gradle

@@ -0,0 +1,20 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+apply plugin: 'elasticsearch.build'
+
+archivesBaseName = 'elasticsearch-ansi-console'
+
+dependencies {
+  compileOnly project(":server")
+  testImplementation project(":test:framework")
+
+  // multi-platform (Windows too) terminal detection and output formatting
+  api "org.fusesource.jansi:jansi:2.3.4"
+}
+

distribution/tools/ansi-console/licenses/jansi-2.3.4.jar.sha1

@@ -0,0 +1 @@
+d924b796e05ff6924df34bc97404131f0c4b46b0

distribution/tools/ansi-console/licenses/jansi-LICENSE.txt

@@ -0,0 +1,202 @@
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distribution/tools/ansi-console/licenses/jansi-NOTICE.txt

@@ -0,0 +1,39 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+package org.elasticsearch.io.ansi;
+
+import org.fusesource.jansi.AnsiConsole;
+import org.fusesource.jansi.AnsiPrintStream;
+import org.fusesource.jansi.AnsiType;
+
+import java.io.PrintStream;
+import java.util.function.Supplier;
+
+/**
+ * Loads the({@link PrintStream} print stream) from {@link AnsiConsole} and checks whether it meets our requirements for a "Console".
+ * @see org.elasticsearch.bootstrap.ConsoleLoader
+ */
+public class AnsiConsoleLoader implements Supplier<PrintStream> {
+
+    public PrintStream get() {
+        final AnsiPrintStream out = AnsiConsole.out();
+        if (isValidConsole(out)) {
+            return out;
+        } else {
+            return null;
+        }
+    }
+
+    static boolean isValidConsole(AnsiPrintStream out) {
+        return out != null // cannot load stdout
+            && out.getType() != AnsiType.Redirected // output is a pipe (etc)
+            && out.getType() != AnsiType.Unsupported // could not determine terminal type
+            && out.getTerminalWidth() > 0 // docker, non-terminal logs
+        ;
+    }
+}

distribution/tools/ansi-console/src/main/java/org/elasticsearch/io/ansi/AnsiConsoleLoader.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.bootstrap;
+
+import org.elasticsearch.io.ansi.AnsiConsoleLoader;
+import org.elasticsearch.test.ESTestCase;
+
+import java.io.PrintStream;
+import java.util.function.Supplier;
+
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.notNullValue;
+
+public class ConsoleLoaderTests extends ESTestCase {
+
+    public void testBuildSupplier() {
+        final Supplier<PrintStream> supplier = ConsoleLoader.buildConsoleLoader(AnsiConsoleLoader.class.getClassLoader());
+        assertThat(supplier, notNullValue());
+        assertThat(supplier, instanceOf(AnsiConsoleLoader.class));
+    }
+}