Decode resource attributes specified via otel.resource.attributes

api/all/src/main/java/io/opentelemetry/api/baggage/propagation/W3CBaggagePropagator.java

@@ -10,6 +10,7 @@
 import io.opentelemetry.api.baggage.Baggage;
 import io.opentelemetry.api.baggage.BaggageBuilder;
 import io.opentelemetry.api.baggage.BaggageEntry;
+import io.opentelemetry.api.internal.PercentEscaper;
 import io.opentelemetry.api.internal.StringUtils;
 import io.opentelemetry.context.Context;
 import io.opentelemetry.context.propagation.TextMapGetter;

api/all/src/main/java/io/opentelemetry/api/baggage/propagation/PercentEscaper.java → api/all/src/main/java/io/opentelemetry/api/internal/PercentEscaper.java

@@ -18,9 +18,8 @@
  * the License.
  */
 
-package io.opentelemetry.api.baggage.propagation;
+package io.opentelemetry.api.internal;
 
-import io.opentelemetry.api.internal.TemporaryBuffers;
 import javax.annotation.CheckForNull;
 
 /**
@@ -59,10 +58,13 @@
  * <p><b>Note:</b> This escaper produces <a
  * href="https://url.spec.whatwg.org/#percent-encode">uppercase</a> hexadecimal sequences.
  *
+ * <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
+ * at any time.
+ *
  * @author David Beaumont
  * @since 15.0
  */
-final class PercentEscaper {
+public final class PercentEscaper {
 
   /** The amount of padding (chars) to use when growing the escape buffer. */
   private static final int DEST_PAD = 32;
@@ -86,7 +88,7 @@ final class PercentEscaper {
   private static final boolean[] safeOctets = createSafeOctets(SAFE_CHARS);
 
   /** The default {@link PercentEscaper} which will *not* replace spaces with plus signs. */
-  static PercentEscaper create() {
+  public static PercentEscaper create() {
     return new PercentEscaper();
   }
 
@@ -109,7 +111,7 @@ private static boolean[] createSafeOctets(String safeChars) {
   }
 
   /** Escape the provided String, using percent-style URL Encoding. */
-  String escape(String s) {
+  public String escape(String s) {
     int slen = s.length();
     for (int index = 0; index < slen; index++) {
       char c = s.charAt(index);

api/all/src/test/java/io/opentelemetry/api/baggage/propagation/PercentEscaperFuzzTest.java

@@ -11,6 +11,7 @@
 import edu.berkeley.cs.jqf.fuzz.JQF;
 import edu.berkeley.cs.jqf.fuzz.junit.GuidedFuzzing;
 import edu.berkeley.cs.jqf.fuzz.random.NoGuidance;
+import io.opentelemetry.api.internal.PercentEscaper;
 import java.net.URLDecoder;
 import org.junit.jupiter.api.Test;
 import org.junit.runner.Result;

sdk-extensions/autoconfigure/build.gradle.kts

@@ -30,6 +30,7 @@ dependencies {
   testImplementation(project(":sdk:testing"))
   testImplementation("com.linecorp.armeria:armeria-junit5")
   testImplementation("com.linecorp.armeria:armeria-grpc")
+  testImplementation("edu.berkeley.cs.jqf:jqf-fuzz")
   testRuntimeOnly("io.grpc:grpc-netty-shaded")
   testImplementation("io.opentelemetry.proto:opentelemetry-proto")
 }

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/ResourceConfiguration.java

@@ -8,12 +8,17 @@
 import io.opentelemetry.api.common.Attributes;
 import io.opentelemetry.api.common.AttributesBuilder;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
+import io.opentelemetry.sdk.autoconfigure.spi.ConfigurationException;
 import io.opentelemetry.sdk.autoconfigure.spi.ResourceProvider;
 import io.opentelemetry.sdk.autoconfigure.spi.internal.ConditionalResourceProvider;
 import io.opentelemetry.sdk.resources.Resource;
 import io.opentelemetry.sdk.resources.ResourceBuilder;
 import io.opentelemetry.semconv.resource.attributes.ResourceAttributes;
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 import java.util.function.BiFunction;
 
@@ -68,7 +73,20 @@ private static Resource createEnvironmentResource(ConfigProperties config) {
   // visible for testing
   static Attributes getAttributes(ConfigProperties configProperties) {
     AttributesBuilder resourceAttributes = Attributes.builder();
-    configProperties.getMap(ATTRIBUTE_PROPERTY).forEach(resourceAttributes::put);
+    try {
+      for (Map.Entry<String, String> entry :
+          configProperties.getMap(ATTRIBUTE_PROPERTY).entrySet()) {
+        resourceAttributes.put(
+            entry.getKey(),
+            // Attributes specified via otel.resource.attributes follow the W3C Baggage spec and
+            // characters outside the baggage-octet range are percent encoded
+            // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/sdk.md#specifying-resource-information-via-an-environment-variable
+            URLDecoder.decode(entry.getValue(), StandardCharsets.UTF_8.displayName()));
+      }
+    } catch (UnsupportedEncodingException e) {
+      // Should not happen since always using standard charset
+      throw new ConfigurationException("Unable to decode resource attributes.", e);
+    }
     String serviceName = configProperties.getString(SERVICE_NAME_PROPERTY);
     if (serviceName != null) {
       resourceAttributes.put(ResourceAttributes.SERVICE_NAME, serviceName);

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/ResourceConfigurationFuzzTest.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.sdk.autoconfigure;
+
+import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
+import static java.util.Collections.singletonMap;
+
+import edu.berkeley.cs.jqf.fuzz.Fuzz;
+import edu.berkeley.cs.jqf.fuzz.JQF;
+import edu.berkeley.cs.jqf.fuzz.junit.GuidedFuzzing;
+import edu.berkeley.cs.jqf.fuzz.random.NoGuidance;
+import io.opentelemetry.api.common.Attributes;
+import io.opentelemetry.api.internal.PercentEscaper;
+import org.junit.jupiter.api.Test;
+import org.junit.runner.Result;
+import org.junit.runner.RunWith;
+
+@SuppressWarnings("SystemOut")
+class ResourceConfigurationFuzzTest {
+
+  @RunWith(JQF.class)
+  public static class TestCases {
+
+    private static final PercentEscaper escaper = PercentEscaper.create();
+
+    @Fuzz
+    public void getAttributesWithRandomValues(String value1, String value2) {
+      Attributes attributes =
+          ResourceConfiguration.getAttributes(
+              DefaultConfigProperties.createForTest(
+                  singletonMap(
+                      ResourceConfiguration.ATTRIBUTE_PROPERTY,
+                      "key1=" + escaper.escape(value1) + ",key2=" + escaper.escape(value2))));
+
+      assertThat(attributes).hasSize(2).containsEntry("key1", value1).containsEntry("key2", value2);
+    }
+  }
+
+  // driver methods to avoid having to use the vintage junit engine, and to enable increasing the
+  // number of iterations:
+
+  @Test
+  void getAttributesWithFuzzing() {
+    Result result =
+        GuidedFuzzing.run(
+            TestCases.class,
+            "getAttributesWithRandomValues",
+            new NoGuidance(10000, System.out),
+            System.out);
+    assertThat(result.wasSuccessful()).isTrue();
+  }
+}