Update ProfileFile to support reading sub-properties. (#5560)

Sub-properties are those nested under another property. E.g.
```
[default]
s3 =
  endpoint_url = foo
```

Before this change, only `s3` would be available, and would contain the raw string underneath the property. After this change, `s3` remains the same, but `foo` can be retrieved through the property `s3.endpoint_url`.

This change also adds the property for `endpoint_url` and a convenience setter for profile content strings.

core/profiles/src/main/java/software/amazon/awssdk/profiles/ProfileFile.java

@@ -31,6 +31,7 @@
 import software.amazon.awssdk.profiles.internal.ProfileFileReader;
 import software.amazon.awssdk.utils.FunctionalUtils;
 import software.amazon.awssdk.utils.IoUtils;
+import software.amazon.awssdk.utils.StringInputStream;
 import software.amazon.awssdk.utils.ToString;
 import software.amazon.awssdk.utils.Validate;
 import software.amazon.awssdk.utils.builder.SdkBuilder;
@@ -233,6 +234,14 @@ public enum Type {
      * required fields.
      */
     public interface Builder extends SdkBuilder<Builder, ProfileFile> {
+        /**
+         * Configure the content of the profile file. This stream will be read from and then closed when {@link #build()} is
+         * invoked.
+         */
+        default Builder content(String content) {
+            return content(new StringInputStream(content));
+        }
+
         /**
          * Configure the content of the profile file. This stream will be read from and then closed when {@link #build()} is
          * invoked.

core/profiles/src/main/java/software/amazon/awssdk/profiles/ProfileProperty.java

@@ -171,6 +171,12 @@ public final class ProfileProperty {
      */
     public static final String REQUEST_MIN_COMPRESSION_SIZE_BYTES = "request_min_compression_size_bytes";
 
+    /**
+     * The endpoint override to use. This may also be specified under a service-specific parent property to override the
+     * endpoint just for that one service.
+     */
+    public static final String ENDPOINT_URL = "endpoint_url";
+
     private ProfileProperty() {
     }
 }

core/profiles/src/main/java/software/amazon/awssdk/profiles/internal/ProfileFileReader.java

@@ -170,7 +170,10 @@ private static void readPropertyContinuationLine(ParserState state, String line)
 
         // If this is a sub-property, make sure it can be parsed correctly by the CLI.
         if (state.validatingContinuationsAsSubProperties) {
-            parsePropertyDefinition(state, line);
+            parsePropertyDefinition(state, line).ifPresent(p -> {
+                String subPropertyDefinition = state.currentPropertyBeingRead + "." + p.left();
+                profileProperties.put(subPropertyDefinition, p.right());
+            });
         }
 
         profileProperties.put(state.currentPropertyBeingRead, newPropertyValue);

core/profiles/src/test/java/software/amazon/awssdk/profiles/ProfileFileTest.java

@@ -343,7 +343,9 @@ public void propertiesCanHaveSubProperties() {
         assertThat(configFileProfiles("[profile foo]\n" +
                                       "s3 =\n" +
                                       " name = value"))
-            .isEqualTo(profiles(profile("foo", property("s3", "\nname = value"))));
+            .isEqualTo(profiles(profile("foo",
+                                        property("s3", "\nname = value"),
+                                        property("s3.name", "value"))));
     }
 
     @Test
@@ -359,7 +361,9 @@ public void subPropertiesCanHaveEmptyValues() {
         assertThat(configFileProfiles("[profile foo]\n" +
                                       "s3 =\n" +
                                       " name ="))
-            .isEqualTo(profiles(profile("foo", property("s3", "\nname ="))));
+            .isEqualTo(profiles(profile("foo",
+                                        property("s3", "\nname ="),
+                                        property("s3.name", ""))));
     }
 
     @Test
@@ -385,7 +389,10 @@ public void subPropertiesCanHaveBlankLines() {
                                       " name = value\n" +
                                       "\t \n" +
                                       " name2 = value2"))
-            .isEqualTo(profiles(profile("foo", property("s3", "\nname = value\nname2 = value2"))));
+            .isEqualTo(profiles(profile("foo",
+                                        property("s3", "\nname = value\nname2 = value2"),
+                                        property("s3.name", "value"),
+                                        property("s3.name2", "value2"))));
     }
 
     @Test
@@ -565,7 +572,7 @@ public void returnsEmptyMap_when_AwsFilesDoNotExist() {
 
     private ProfileFile configFile(String configFile) {
         return ProfileFile.builder()
-                          .content(new StringInputStream(configFile))
+                          .content(configFile)
                           .type(ProfileFile.Type.CONFIGURATION)
                           .build();
     }
@@ -576,7 +583,7 @@ private Map<String, Profile> configFileProfiles(String configFile) {
 
     private ProfileFile credentialFile(String credentialFile) {
         return ProfileFile.builder()
-                          .content(new StringInputStream(credentialFile))
+                          .content(credentialFile)
                           .type(ProfileFile.Type.CREDENTIALS)
                           .build();
     }