Trim PEM-encoded text in PemContent.of

Closes gh-41540

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ssl/pem/PemContent.java

@@ -25,14 +25,17 @@ import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
 import java.security.PrivateKey;
 import java.security.cert.X509Certificate;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 import org.springframework.boot.io.ApplicationResourceLoader;
 import org.springframework.core.io.Resource;
 import org.springframework.util.Assert;
 import org.springframework.util.StreamUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * PEM encoded content that can provide {@link X509Certificate certificates} and
@@ -51,7 +54,9 @@ public final class PemContent {
 	private final String text;
 
 	private PemContent(String text) {
-		this.text = text;
+		this.text = Arrays.stream(StringUtils.delimitedListToStringArray(text, "\n"))
+			.map(String::trim)
+			.collect(Collectors.joining("\n"));
 	}
 
 	/**

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/ssl/pem/PemContentTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -114,6 +114,70 @@ class PemContentTests {
 		assertThat(PemContent.load(content)).hasToString(content);
 	}
 
+	@Test
+	void loadWithStringWhenContentIsPemContentReturnsTrimmedContent() throws Exception {
+		String content = """
+				-----BEGIN CERTIFICATE-----
+					MIICpDCCAYwCCQCDOqHKPjAhCTANBgkqhkiG9w0BAQUFADAUMRIwEAYDVQQDDAls
+					b2NhbGhvc3QwHhcNMTQwOTEwMjE0MzA1WhcNMTQxMDEwMjE0MzA1WjAUMRIwEAYD
+				VQQDDAlsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDR
+					0KfxUw7MF/8RB5/YXOM7yLnoHYb/M/6dyoulMbtEdKKhQhU28o5FiDkHcEG9PJQL
+				gqrRgAjl3VmCC9omtfZJQ2EpfkTttkJjnKOOroXhYE51/CYSckapBYCVh8GkjUEJ
+					uEfnp07cTfYZFqViIgIWPZyjkzl3w4girS7kCuzNdDntVJVx5F/EsFwMA8n3C0Qa
+				zHQoM5s00Fer6aTwd6AW0JD5QkADavpfzZ554e4HrVGwHlM28WKQQkFzzGu44FFX
+					yVuEF3HeyVPug8GRHAc8UU7ijVgJB5TmbvRGYowIErD5i4VvGLuOv9mgR3aVyN0S
+					dJ1N7aJnXpeSQjAgf03jAgMBAAEwDQYJKoZIhvcNAQEFBQADggEBAE4yvwhbPldg
+					Bpl7sBw/m2B3bfiNeSqa4tII1PQ7ysgWVb9HbFNKkriScwDWlqo6ljZfJ+SDFCoj
+				bQz4fOFdMAOzRnpTrG2NAKMoJLY0/g/p7XO00PiC8T3h3BOJ5SHuW3gUyfGXmAYs
+					DnJxJOrwPzj57xvNXjNSbDOJ3DRfCbB0CWBexOeGDiUokoEq3Gnz04Q4ZfHyAcpZ
+				3deMw8Od5p9WAoCh3oClpFyOSzXYKZd+3ppMMtfc4wnbfocnfSFxj0UCpOEJw4Ez
+				+lGuHKdhNOVW9CmqPD1y76o6c8PQKuF7KZEoY2jvy3GeIfddBvqXgZ4PbWvFz1jO
+					32C9XWHwRA4=
+					-----END CERTIFICATE-----  """;
+		String trimmedContent = """
+				-----BEGIN CERTIFICATE-----
+				MIICpDCCAYwCCQCDOqHKPjAhCTANBgkqhkiG9w0BAQUFADAUMRIwEAYDVQQDDAls
+				b2NhbGhvc3QwHhcNMTQwOTEwMjE0MzA1WhcNMTQxMDEwMjE0MzA1WjAUMRIwEAYD
+				VQQDDAlsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDR
+				0KfxUw7MF/8RB5/YXOM7yLnoHYb/M/6dyoulMbtEdKKhQhU28o5FiDkHcEG9PJQL
+				gqrRgAjl3VmCC9omtfZJQ2EpfkTttkJjnKOOroXhYE51/CYSckapBYCVh8GkjUEJ
+				uEfnp07cTfYZFqViIgIWPZyjkzl3w4girS7kCuzNdDntVJVx5F/EsFwMA8n3C0Qa
+				zHQoM5s00Fer6aTwd6AW0JD5QkADavpfzZ554e4HrVGwHlM28WKQQkFzzGu44FFX
+				yVuEF3HeyVPug8GRHAc8UU7ijVgJB5TmbvRGYowIErD5i4VvGLuOv9mgR3aVyN0S
+				dJ1N7aJnXpeSQjAgf03jAgMBAAEwDQYJKoZIhvcNAQEFBQADggEBAE4yvwhbPldg
+				Bpl7sBw/m2B3bfiNeSqa4tII1PQ7ysgWVb9HbFNKkriScwDWlqo6ljZfJ+SDFCoj
+				bQz4fOFdMAOzRnpTrG2NAKMoJLY0/g/p7XO00PiC8T3h3BOJ5SHuW3gUyfGXmAYs
+				DnJxJOrwPzj57xvNXjNSbDOJ3DRfCbB0CWBexOeGDiUokoEq3Gnz04Q4ZfHyAcpZ
+				3deMw8Od5p9WAoCh3oClpFyOSzXYKZd+3ppMMtfc4wnbfocnfSFxj0UCpOEJw4Ez
+				+lGuHKdhNOVW9CmqPD1y76o6c8PQKuF7KZEoY2jvy3GeIfddBvqXgZ4PbWvFz1jO
+				32C9XWHwRA4=
+				-----END CERTIFICATE-----""";
+		assertThat(PemContent.load(content)).hasToString(trimmedContent);
+	}
+
+	@Test
+	void isPresentInTextWithUntrimmedContent() throws Exception {
+		String content = """
+				-----BEGIN CERTIFICATE-----
+					MIICpDCCAYwCCQCDOqHKPjAhCTANBgkqhkiG9w0BAQUFADAUMRIwEAYDVQQDDAls
+					b2NhbGhvc3QwHhcNMTQwOTEwMjE0MzA1WhcNMTQxMDEwMjE0MzA1WjAUMRIwEAYD
+				VQQDDAlsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDR
+					0KfxUw7MF/8RB5/YXOM7yLnoHYb/M/6dyoulMbtEdKKhQhU28o5FiDkHcEG9PJQL
+				gqrRgAjl3VmCC9omtfZJQ2EpfkTttkJjnKOOroXhYE51/CYSckapBYCVh8GkjUEJ
+					uEfnp07cTfYZFqViIgIWPZyjkzl3w4girS7kCuzNdDntVJVx5F/EsFwMA8n3C0Qa
+				zHQoM5s00Fer6aTwd6AW0JD5QkADavpfzZ554e4HrVGwHlM28WKQQkFzzGu44FFX
+					yVuEF3HeyVPug8GRHAc8UU7ijVgJB5TmbvRGYowIErD5i4VvGLuOv9mgR3aVyN0S
+					dJ1N7aJnXpeSQjAgf03jAgMBAAEwDQYJKoZIhvcNAQEFBQADggEBAE4yvwhbPldg
+					Bpl7sBw/m2B3bfiNeSqa4tII1PQ7ysgWVb9HbFNKkriScwDWlqo6ljZfJ+SDFCoj
+				bQz4fOFdMAOzRnpTrG2NAKMoJLY0/g/p7XO00PiC8T3h3BOJ5SHuW3gUyfGXmAYs
+					DnJxJOrwPzj57xvNXjNSbDOJ3DRfCbB0CWBexOeGDiUokoEq3Gnz04Q4ZfHyAcpZ
+				3deMw8Od5p9WAoCh3oClpFyOSzXYKZd+3ppMMtfc4wnbfocnfSFxj0UCpOEJw4Ez
+				+lGuHKdhNOVW9CmqPD1y76o6c8PQKuF7KZEoY2jvy3GeIfddBvqXgZ4PbWvFz1jO
+					32C9XWHwRA4=
+					-----END CERTIFICATE-----  """;
+		assertThat(PemContent.isPresentInText(content)).isTrue();
+	}
+
 	@Test
 	void loadWithStringWhenClasspathLocationReturnsContent() throws IOException {
 		String actual = PemContent.load("classpath:test-cert.pem").toString();