try to bridge StructuredConfigProperties

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/internal/properties/OtelSpringProperties.java

@@ -17,6 +17,27 @@
 @ConfigurationProperties(prefix = "otel")
 public final class OtelSpringProperties {
 
+  public static final class OtlpHeader {
+    private String key;
+    private String value;
+
+    public String getKey() {
+      return key;
+    }
+
+    public void setKey(String key) {
+      this.key = key;
+    }
+
+    public String getValue() {
+      return value;
+    }
+
+    public void setValue(String value) {
+      this.value = value;
+    }
+  }
+
   /**
    * This class is internal and is hence not for public use. Its APIs are unstable and can change at
    * any time.
@@ -315,6 +336,8 @@ public void setHttp(Http http) {
 
   private List<String> propagators = Collections.emptyList();
 
+  private List<OtlpHeader> otlpHeaders = Collections.emptyList();
+
   private Java java = new Java();
 
   private Experimental experimental = new Experimental();
@@ -343,6 +366,14 @@ public void setJava(Java java) {
     this.java = java;
   }
 
+  public List<OtlpHeader> getOtlpHeaders() {
+    return otlpHeaders;
+  }
+
+  public void setOtlpHeaders(List<OtlpHeader> otlpHeaders) {
+    this.otlpHeaders = otlpHeaders;
+  }
+
   public Experimental getExperimental() {
     return experimental;
   }

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/internal/properties/SpringConfigYamlProperties.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.instrumentation.spring.autoconfigure.internal.properties;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import javax.annotation.Nullable;
+import io.opentelemetry.sdk.autoconfigure.spi.internal.StructuredConfigProperties;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.EnumerablePropertySource;
+
+/**
+ * This class is internal and is hence not for public use. Its APIs are unstable and can change at
+ * any time.
+ */
+public class SpringConfigYamlProperties implements StructuredConfigProperties {
+  private final ConfigurableEnvironment environment;
+  private final String prefix;
+  private final StructuredConfigProperties fallback;
+  private final OtelSpringProperties otelSdkProperties;
+
+  public SpringConfigYamlProperties(
+      ConfigurableEnvironment environment, String prefix, StructuredConfigProperties fallback,
+      OtelSpringProperties otelSdkProperties) {
+    this.environment = environment;
+    this.prefix = prefix;
+    this.fallback = fallback;
+    this.otelSdkProperties = otelSdkProperties;
+  }
+
+  @Nullable
+  @Override
+  public String getString(String name) {
+    return or(environment.getProperty(fullKey(name), String.class), fallback.getString(name));
+  }
+
+  @Nullable
+  @Override
+  public Boolean getBoolean(String name) {
+    return or(environment.getProperty(fullKey(name), Boolean.class), fallback.getBoolean(name));
+  }
+
+  @Nullable
+  @Override
+  public Integer getInt(String name) {
+    return or(environment.getProperty(fullKey(name), Integer.class), fallback.getInt(name));
+  }
+
+  @Nullable
+  @Override
+  public Long getLong(String name) {
+    return or(environment.getProperty(fullKey(name), Long.class), fallback.getLong(name));
+  }
+
+  @Nullable
+  @Override
+  public Double getDouble(String name) {
+    return or(environment.getProperty(fullKey(name), Double.class), fallback.getDouble(name));
+  }
+
+  private String fullKey(String name) {
+    return prefix + "." + name;
+  }
+
+  @Override
+  public Set<String> getPropertyKeys() {
+    return environment.getPropertySources().stream()
+        .flatMap(
+            source ->
+                source instanceof EnumerablePropertySource<?>
+                    ? Arrays.stream(((EnumerablePropertySource<?>) source).getPropertyNames())
+                    : Stream.empty())
+        .filter(name -> name.startsWith(prefix + "."))
+        .collect(Collectors.toSet());
+  }
+
+  @Nullable
+  @Override
+  public List<StructuredConfigProperties> getStructuredList(String name) {
+    if ("otlp.headers".equals(fullKey(name))) {
+      // this means, we mirror the entire model tree
+      // therefore, it seems to be better te tweak [email protected]:joelittlejohn/jsonschema2pojo.git
+      // to add the required @ConfigurationProperties(prefix = "otel") annotations
+      // (add an org.jsonschema2pojo.Annotator) - and maybe a bit more
+      List<OtelSpringProperties.OtlpHeader> otlpHeaders = otelSdkProperties.getOtlpHeaders();
+    }
+
+    return null;
+//    return or(environment.getProperty(name, List.class), otelSdkProperties.getList(name));
+  }
+
+  @Nullable
+  private static <T> T or(@Nullable T first, @Nullable T second) {
+    return first != null ? first : second;
+  }
+}