内容制作者通常希望了解其观众的受众特征。您可以使用共享存储空间在您拥有用户特征数据的环境(例如您的第一方网站)中记录用户特征数据,然后使用汇总报告将这些数据纳入其他网站(例如嵌入式内容)的报告中。
Shared Storage API 是一项 Privacy Sandbox 提案,适用于通用的跨网站存储,支持许多可能的用例。Private Aggregation API 是 Shared Storage 中提供的一个输出,可让您汇总跨网站数据。
试用用户受众特征衡量功能
如需使用共享存储空间和不公开汇总功能试用用户特征衡量功能,请确认您使用的是 Chrome Canary 和 Dev M107 或更高版本。启用 chrome://settings/adPrivacy 下的所有广告隐私权 API。
您还可以在命令行中使用 --enable-features=PrivacySandboxAdsAPIsOverride,OverridePrivacySandboxSettingsLocalTesting,SharedStorageAPI,FencedFrames 标志启用共享存储空间。
试验代码示例
您可能希望衡量在不同网站上观看过您内容的用户的某些受众特征,例如年龄段或地理位置。在此示例中,内容 ID、年龄段 ID 和地理位置 ID 维度会编码到汇总键(存储分区)中,而计数则用作可汇总的值。生成的摘要报告将提供以下信息:“大约有 391 名年龄在 18-39 周岁且来自欧洲的用户观看了内容 ID 123。”
在此示例中:
demographic-measurement.js使用帧加载,并负责加载共享存储工作容器。demographic-measurement-worklet.js是 Shared Storage Worklet,用于读取 Shared Storage 中的受众特征数据,并使用 Private Aggregation API 发送报告。
(在衡量之前的某个时间点运行,用于将受众特征数据设置为 Shared Storage)
function getDemogrationsData() {
  // Collect age group and continent data
  return {
    ageGroup,
    continent
  }
}
async function storeDemographics() {
  const { ageGroup, continent } = getDemographicsData();
  await window.sharedStorage.set('age-group', ageGroup);
  await window.sharedStorage.set('continent', continent);
}
storeDemographics();
async function measureDemographics() {
  // Load the Shared Storage worklet
  await window.sharedStorage.worklet.addModule('demographics-measurement-worklet.js');
  // Run the demographics measurement operation
  await window.sharedStorage.run('demographics-measurement', { data: { contentId: '123' } });
}
measureDemographics();
demographic-measurement-worklet.js
// Learn more about noise and scaling from the Private Aggregation fundamentals
// documentation on Chrome blog
const SCALE_FACTOR = 65536;
/**
 * The bucket key must be a number, and in this case, it is just the ad campaign
 * ID itself. For more complex bucket key construction, see other use cases in
 * this demo.
 */
const AGGREGATION_KEY_MAP = {
  ageGroupId: {
    '18-39': '1',
    '40-64': '2',
    '65+': '3',
  },
  continentId: {
    africa: '1',
    antarctica: '2',
    asia: '3',
    australia: '4',
    europe: '5',
    'north-america': '6',
    'south-america': '7',
  },
};
/**
 * The aggregation key will be in the format of:
 * contentId | ageGroupId | continentId
 *
 * For example, a user from Australia between the age of 40-64, who has
 * seen the Content ID 321 will be represented by the key:
 * 321 | 2 | 4 or 32124
 */
function generateAggregationKey(contentId, ageGroup, continent) {
  const ageGroupId = AGGREGATION_KEY_MAP.ageGroupId[ageGroup];
  const continentId = AGGREGATION_KEY_MAP.continentId[continent];
  const aggregationKey = BigInt(`${contentId}${ageGroupId}${continentId}`);
  return aggregationKey;
}
class DemographicsMeasurementOperation {
  async run(data) {
    const { contentId } = data;
    // Read from Shared Storage
    const key = 'has-reported-content';
    const hasReportedContent = (await sharedStorage.get(key)) === 'true';
    const ageGroup = await sharedStorage.get('age-group');
    const continent = await sharedStorage.get('continent');
    // Don't report if a report has been sent already
    if (hasReportedContent) {
      return;
    }
    // Generate the aggregation key and the aggregatable value
    const bucket = generateAggregationKey(contentId, ageGroup, continent);
    const value = 1 * SCALE_FACTOR;
    // Send an aggregatable report using the Private Aggregation API
    privateAggregation.contributeToHistogram({ bucket, value });
    // Set the report submission status flag
    await sharedStorage.set(key, true);
  }
}
// Register the operation
register('demographics-measurement', DemographicsMeasurementOperation); \
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请注意,Shared Storage API 提案正在积极讨论和制作中,因此可能会发生变化。
我们非常期待您对 Shared Storage API 的看法。