* the License.
 */

package com.google.common.collect;

import static com.google.common.collect.Internal.toNanosSaturated;
import static java.util.concurrent.TimeUnit.NANOSECONDS;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Preconditions;

 * EventBus allows publish-subscribe-style communication.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/EventBusExplained">{@code EventBus}</a>.
 */
@CheckReturnValue
@NullMarked
package com.google.common.eventbus;

import com.google.errorprone.annotations.CheckReturnValue;

 *
 * <p>This package is a part of the open-source <a href="https://github.com/google/guava">Guava</a>
 * library.
 *
 * @author Craig Berry
 */
@CheckReturnValue
@NullMarked
package com.google.common.net;

import com.google.errorprone.annotations.CheckReturnValue;

# OAuth2 範圍（scopes） { #oauth2-scopes }

你可以直接在 FastAPI 中使用 OAuth2 的 scopes，已整合可無縫運作。

這能讓你在 OpenAPI 應用（以及 API 文件）中，依照 OAuth2 標準，實作更細粒度的權限系統。

帶有 scopes 的 OAuth2 是許多大型身分驗證提供者（如 Facebook、Google、GitHub、Microsoft、X（Twitter）等）所使用的機制。他們用它來為使用者與應用程式提供特定權限。

每次你「使用」Facebook、Google、GitHub、Microsoft、X（Twitter）「登入」時，那個應用就是在使用帶有 scopes 的 OAuth2。

在本節中，你將看到如何在你的 FastAPI 應用中，用同樣的帶有 scopes 的 OAuth2 管理驗證與授權。

/// warning

這一節算是進階內容。如果你剛開始，可以先跳過。

 * the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.nio.Buffer;

/**
 * Wrappers around {@link Buffer} methods that are covariantly overridden in Java 9+. See
 * https://github.com/google/guava/issues/3990
 */
@J2ktIncompatible
@GwtIncompatible

 * the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.nio.Buffer;

/**
 * Wrappers around {@link Buffer} methods that are covariantly overridden in Java 9+. See
 * https://github.com/google/guava/issues/3990
 */
@J2ktIncompatible
@GwtIncompatible

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.DoNotMock;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.jspecify.annotations.Nullable;

 * @since 1.0
 */
/*
 * Some of the annotations below were added after we released our separate
 * com.google.guava:listenablefuture:1.0 artifact. (For more on that artifact, see
 * https://github.com/google/guava/releases/tag/v27.0) This means that the copy of ListenableFuture
 * in com.google.guava:guava differs from the "frozen" copy in the listenablefuture artifact. This

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtCompatible;
import java.util.Objects;
import org.jspecify.annotations.Nullable;

/**
 * Determines an output value based on an input value; a pre-Java-8 version of {@link

import static java.lang.annotation.RetentionPolicy.CLASS;

import com.google.common.annotations.GwtCompatible;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * Signifies that a test should not be run under Android. This annotation is respected only by our
 * Google-internal Android suite generators. Note that those generators also suppress any test
 * annotated with LargeTest.