如何在Cloud Functions存储触发器中获取经过身份验证的Firebase用户的uid [英] How to get the uid of the authenticated Firebase user in a Cloud Functions storage trigger

问题描述

背景:我正在将Firebase Cloud Functions，新的Firestore数据库和存储桶与Android客户端一起使用.

Background: I'm using Firebase Cloud Functions, the new Firestore Database, and storage bucket with an Android client.

我要完成的任务: 当用户将图片上传到存储桶时，我想使用云功能获取到存储桶中图像位置的文件路径/链接，并将此字符串作为新文档存储在图片"下的新集合下.当前已在Firestore中登录用户的文档.

What I want to accomplish: When a user uploads a picture to a storage bucket, I want to use cloud functions to get the file path/link to the image location in the storage bucket and store this string as a new document under a new collection called "pictures" under the currently logged in user's document in Firestore.

这样，我可以看到每个用户直接在Firestore中上传的图像，这样可以更轻松地将特定用户的图像下拉到Android客户端.

That way, I can see the images each user has uploaded directly in Firestore and it makes it easier to pull a specific user's images down to the Android client.

到目前为止我已经完成的事情: 1.用户首次登录时，它将在新的Firestore数据库中创建一个用户文档. 2.登录的用户可以将图像上传到存储桶. 3.使用Firebase Cloud Functions，我设法获得了存储位置的文件路径/链接，如下所示:

What I've completed so far: 1. When a user logs in for the first time, it creates a user doc in the new Firestore Database. 2. A logged in user can upload an image to a storage bucket. 3. Using Firebase Cloud Functions, I managed to get the file path/link of the storage location as follows:

/**
 * When a user selects a profile picture on their device during onboarding,
 * the image is sent to Firebase Storage from a function running on their device. 
 * The cloud function below returns the file path of the newly uploaded image. 
 */
exports.getImageStorageLocationWhenUploaded = functions.storage.object().onFinalize((object) => {
  const filePath = object.name; // File path in the bucket.
  const contentType = object.contentType; // File content type.

  // Exit if this is triggered on a file that is not an image.
  if (!contentType.startsWith('image/')) {
    console.log('This is not an image.');
    return null;
  }
console.log(filePath);
});

问题:如何使用Cloud Functions将当前登录的用户的上传图像文件路径/链接作为新文档存储在Firestore数据库中此登录用户的文档下? /p>

Question: How do I get the currently logged in user and store this user's uploaded image file path/link as a new doc under this logged in user's documents within the Firestore database using Cloud Functions?

推荐答案

当前，使用Cloud Storage触发器，您无权访问经过身份验证的用户信息.要解决此问题，您必须执行一些操作，例如将uid嵌入文件的路径中，或将uid作为元数据添加到文件上传中.

Currently, with Cloud Storage triggers, you don't have access to authenticated user information. To work around that, you'll have to do something like embed the uid in the path of the file, or add the uid as metadata in the file upload.

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