fix: refactor FakeCredentials (#325)

This change allows users who want to try to manually configured FirestoreOptions for an emulator to be able to leverage the credentials we use when boostrapping via environment variable. * Rename FakeCredentials to EmulatorCredentials * Make EmulatorCredentials static * Move from inner class of FirestoreOptions.Builder to inner class of FirestoreOptions Related to #190

Author: BenWhitehead

google-cloud-firestore/clirr-ignored-differences.xml

@@ -162,4 +162,14 @@
  <to>com.google.cloud.firestore.CollectionGroup</to>
  </difference>
 
+ <!--
+ FakeCredentials Refactor
+ com.google.cloud.firestore.FirestoreOptions$Builder$FakeCredentials -> com.google.cloud.firestore.FirestoreOptions$EmulatorCredentials
+ -->
+ <difference>
+ <differenceType>8001</differenceType>
+ <className>com/google/cloud/firestore/FirestoreOptions$Builder$FakeCredentials</className>
+ <to>*</to>
+ </difference>
+
 </differences>

google-cloud-firestore/src/main/java/com/google/cloud/firestore/FirestoreOptions.java

@@ -226,39 +226,39 @@ public ManagedChannelBuilder apply(ManagedChannelBuilder input) {
  .build());
  // Use a `CredentialProvider` to match the Firebase Admin SDK, which prevents the Admin SDK
  // from overwriting the Emulator credentials.
- this.setCredentialsProvider(FixedCredentialsProvider.create(new FakeCredentials()));
+ this.setCredentialsProvider(FixedCredentialsProvider.create(new EmulatorCredentials()));
  }
 
  return new FirestoreOptions(this);
  }
+ }
 
- public class FakeCredentials extends Credentials {
- private final Map<String, List<String>> HEADERS =
- ImmutableMap.of("Authorization", Arrays.asList("Bearer owner"));
-
- @Override
- public String getAuthenticationType() {
- throw new IllegalArgumentException("Not supported");
- }
+ public static class EmulatorCredentials extends Credentials {
+ private final Map<String, List<String>> HEADERS =
+ ImmutableMap.of("Authorization", Arrays.asList("Bearer owner"));
 
-  @Override
-  public Map<String, List<String>> getRequestMetadata(URI uri) {
-  return HEADERS;
-  }
+ @Override
+ public String getAuthenticationType() {
+ throw new IllegalArgumentException("Not supported");
+ }
 
-  @Override
-  public boolean hasRequestMetadata() {
-  return true;
-  }
+ @Override
+ public Map<String, List<String>> getRequestMetadata(URI uri) {
+ return HEADERS;
+ }
 
-  @Override
-  public boolean hasRequestMetadataOnly() {
-  return true;
-  }
+ @Override
+ public boolean hasRequestMetadata() {
+ return true;
+ }
 
- @Override
- public void refresh() {}
+ @Override
+ public boolean hasRequestMetadataOnly() {
+ return true;
  }
+
+ @Override
+ public void refresh() {}
  }
 
  @InternalApi("This class should only be extended within google-cloud-java")