Add operation to list OIDC provider configs.

src/main/java/com/google/firebase/auth/AbstractFirebaseAuth.java

@@ -29,8 +29,10 @@
 import com.google.firebase.FirebaseApp;
 import com.google.firebase.auth.FirebaseUserManager.EmailLinkType;
 import com.google.firebase.auth.FirebaseUserManager.UserImportRequest;
+import com.google.firebase.auth.ListProviderConfigsPage;
+import com.google.firebase.auth.ListProviderConfigsPage.DefaultOidcProviderConfigSource;
+import com.google.firebase.auth.ListUsersPage;
 import com.google.firebase.auth.ListUsersPage.DefaultUserSource;
-import com.google.firebase.auth.ListUsersPage.PageFactory;
 import com.google.firebase.auth.UserRecord;
 import com.google.firebase.auth.internal.FirebaseTokenFactory;
 import com.google.firebase.internal.CallableOperation;
@@ -500,8 +502,8 @@ private CallableOperation<ListUsersPage, FirebaseAuthException> listUsersOp(
       @Nullable final String pageToken, final int maxResults) {
     checkNotDestroyed();
     final FirebaseUserManager userManager = getUserManager();
-    final PageFactory factory =
-        new PageFactory(new DefaultUserSource(userManager, jsonFactory), maxResults, pageToken);
+    final DefaultUserSource source = new DefaultUserSource(userManager, jsonFactory);
+    final ListUsersPage.Factory factory = new ListUsersPage.Factory(source, maxResults, pageToken);
     return new CallableOperation<ListUsersPage, FirebaseAuthException>() {
       @Override
       protected ListUsersPage execute() throws FirebaseAuthException {
@@ -1033,6 +1035,7 @@ public OidcProviderConfig getOidcProviderConfig(@NonNull String providerId)
 
   /**
    * Similar to {@link #getOidcProviderConfig(String)} but performs the operation asynchronously.
+   * Page size will be limited to 100 provider configs.
    *
    * @param providerId A provider ID string.
    * @return An {@code ApiFuture} which will complete successfully with an
@@ -1058,6 +1061,78 @@ protected OidcProviderConfig execute() throws FirebaseAuthException {
     };
   }
 
+  /**
+   * Gets a page of OIDC Auth provider configs starting from the specified {@code pageToken}.
+   *
+   * @param pageToken A non-empty page token string, or null to retrieve the first page of provider
+   *     configs.
+   * @param maxResults Maximum number of provider configs to include in the returned page. This may
+   *     not exceed 100.
+   * @return A {@link ListProviderConfigsPage} instance.
+   * @throws IllegalArgumentException If the specified page token is empty, or max results value is
+   *     invalid.
+   * @throws FirebaseAuthException If an error occurs while retrieving user data.
+   */
+  public ListProviderConfigsPage<OidcProviderConfig> listOidcProviderConfigs(
+        @Nullable String pageToken, int maxResults) throws FirebaseAuthException {
+    return listOidcProviderConfigsOp(pageToken, maxResults).call();
+  }
+
+  /**
+   * Similar to {@link #listlistOidcProviderConfigs(String)} but performs the operation
+   * asynchronously. Page size will be limited to 100 provider configs.
+   *
+   * @param pageToken A non-empty page token string, or null to retrieve the first page of provider
+   *     configs.
+   * @return An {@code ApiFuture} which will complete successfully with a
+   *     {@link ListProviderConfigsPage} instance. If an error occurs while retrieving provider
+   *     config data, the future throws an exception.
+   * @throws IllegalArgumentException If the specified page token is empty.
+   */
+  public ApiFuture<ListProviderConfigsPage<OidcProviderConfig>> listOidcProviderConfigsAsync(
+      @Nullable String pageToken) {
+    return listOidcProviderConfigsAsync(
+        pageToken,
+        FirebaseUserManager.MAX_LIST_PROVIDER_CONFIGS_RESULTS);
+  }
+
+  /**
+   * Similar to {@link #listOidcProviderConfigs(String, int)} but performs the operation
+   * asynchronously.
+   *
+   * @param pageToken A non-empty page token string, or null to retrieve the first page of provider
+   *     configs.
+   * @param maxResults Maximum number of provider configs to include in the returned page. This may
+   *     not exceed 100.
+   * @return An {@code ApiFuture} which will complete successfully with a
+   *     {@link ListProviderConfigsPage} instance. If an error occurs while retrieving provider
+   *     config data, the future throws an exception.
+   * @throws IllegalArgumentException If the specified page token is empty, or max results value is
+   *     invalid.
+   */
+  public ApiFuture<ListProviderConfigsPage<OidcProviderConfig>> listOidcProviderConfigsAsync(
+      @Nullable String pageToken,
+      int maxResults) {
+    return listOidcProviderConfigsOp(pageToken, maxResults).callAsync(firebaseApp);
+  }
+
+  private CallableOperation<ListProviderConfigsPage<OidcProviderConfig>, FirebaseAuthException>
+      listOidcProviderConfigsOp(@Nullable final String pageToken, final int maxResults) {
+    checkNotDestroyed();
+    final FirebaseUserManager userManager = getUserManager();
+    final DefaultOidcProviderConfigSource source = new DefaultOidcProviderConfigSource(userManager);
+    final ListProviderConfigsPage.Factory<OidcProviderConfig> factory =
+        new ListProviderConfigsPage.Factory<OidcProviderConfig>(source, maxResults, pageToken);
+    return
+      new CallableOperation<ListProviderConfigsPage<OidcProviderConfig>, FirebaseAuthException>() {
+        @Override
+        protected ListProviderConfigsPage<OidcProviderConfig> execute()
+            throws FirebaseAuthException {
+          return factory.create();
+        }
+    };
+  }
+
   /**
    * Deletes the provider config identified by the specified provider ID.
    *

src/main/java/com/google/firebase/auth/FirebaseUserManager.java

@@ -43,6 +43,7 @@
 import com.google.firebase.auth.internal.DownloadAccountResponse;
 import com.google.firebase.auth.internal.GetAccountInfoResponse;
 import com.google.firebase.auth.internal.HttpErrorResponse;
+import com.google.firebase.auth.internal.ListOidcProviderConfigsResponse;
 import com.google.firebase.auth.internal.ListTenantsResponse;
 import com.google.firebase.auth.internal.UploadAccountResponse;
 import com.google.firebase.internal.ApiClientUtils;
@@ -94,6 +95,7 @@ class FirebaseUserManager {
       .put("INVALID_DYNAMIC_LINK_DOMAIN", "invalid-dynamic-link-domain")
       .build();
 
+  static final int MAX_LIST_PROVIDER_CONFIGS_RESULTS = 100;
   static final int MAX_LIST_TENANTS_RESULTS = 1000;
   static final int MAX_LIST_USERS_RESULTS = 1000;
   static final int MAX_IMPORT_USERS = 1000;
@@ -338,6 +340,26 @@ OidcProviderConfig getOidcProviderConfig(String providerId) throws FirebaseAuthE
     return sendRequest("GET", url, null, OidcProviderConfig.class);
   }
 
+  ListOidcProviderConfigsResponse listOidcProviderConfigs(int maxResults, String pageToken)
+      throws FirebaseAuthException {
+    ImmutableMap.Builder<String, Object> builder =
+        ImmutableMap.<String, Object>builder().put("pageSize", maxResults);
+    if (pageToken != null) {
+      checkArgument(!pageToken.equals(
+          ListTenantsPage.END_OF_LIST), "invalid end of list page token");
+      builder.put("nextPageToken", pageToken);
+    }
+
+    GenericUrl url = new GenericUrl(idpConfigMgtBaseUrl + "/oauthIdpConfigs");
+    url.putAll(builder.build());
+    ListOidcProviderConfigsResponse response =
+        sendRequest("GET", url, null, ListOidcProviderConfigsResponse.class);
+    if (response == null) {
+      throw new FirebaseAuthException(INTERNAL_ERROR, "Failed to retrieve provider configs.");
+    }
+    return response;
+  }
+
   void deleteProviderConfig(String providerId) throws FirebaseAuthException {
     GenericUrl url = new GenericUrl(idpConfigMgtBaseUrl + getOidcUrlSuffix(providerId));
     sendRequest("DELETE", url, null, GenericJson.class);