Firebase storage API - upload file with metada

Question

I am using the rest api to upload files to firebase storage as described in the following answer https://stackoverflow.com/a/65462416/8634683.

And I would like to set the cache-control metadata but can't figure it out.

I found the next firebase doc - https://firebase.google.com/docs/storage/web/file-metadata but didn't saw any information about the rest API.

=== Update ====

So I did a little bit of reverse engineering, , and I found that when I am using the JS-SDK, the library add a prefix to the file, Any one know what is the meaning of the first long number?

dan · Accepted Answer · 2021-12-01 09:29:41Z

2

So I found the answer:

Send the blob file with a prefix and suffix as follow:

let prefix = `
--23483860318350978727016216849495
Content-Type: application/json; charset=utf-8
Content-Disposition: form-data; name="metadata"

{"name":"${filePath}", "cacheControl":"max-age=7200","contentType":"${fileType}"}
                
--23483860318350978727016216849495
Content-Type: ${fileType}`

let suffix = '\n--23483860318350978727016216849495--'

let blobWithMetadata = new Blob([prefix, blob, suffix])

and add the following headers:

headers = { 
  'x-goog-upload-protocol': 'multipart',
  'content-type': 'multipart/related; boundary=23483860318350978727016216849495'
}

answered Dec 1, 2021 at 9:29

dan

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Curt W. · Accepted Answer · 2022-09-17 18:19:12Z

0

Another option is to make an additional call but use patch method instead of post and submit the metadata as json in the body.

answered Sep 17, 2022 at 18:19

Curt W.

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