Retrieve file size for videos stored on Google Photos

问题

Context: I wanted to see how I'm using my Google Photos space and I wrote a little script in Python that uses the Google Photos API to retrieve all my albums and it's contents (using https://developers.google.com/photos/library/reference/rest/v1/mediaItems/search). The file information is not there but using the mediaItem baseUrl (documented https://developers.google.com/photos/library/reference/rest/v1/mediaItems#MediaItem) I can then perform a HEAD request and get the content-length from the headers. This seems to work fine for the photos but the size for videos is grossly underestimated. My guess is that Google Photos is getting ready to stream the videos and it's not sending the whole video information.

Question: Is there any way to retrieve file size for videos stored on Google Photos, hopefully, without having to download the whole video? The app does know about the file size, but that doesn't seem to be available in the API. Is there any way to send some request headers to get the file size?

Extra info: I'm using Python and the httplib2.Http() for my HEAD requests (happy to use the requests module or any other alternative).

This is the information retrieved from the API, this video file is a little over 100MB (definitely not 30k):

{
  "id": "XYZ",
  "productUrl": "https://photos.google.com/lr/photo/XYZ",
  "baseUrl": "https://lh3.googleusercontent.com/lr/ABC",
  "mimeType": "video/mp4",
  "mediaMetadata": {
    "creationTime": "2018-11-27T03:43:27Z",
    "width": "1920",
    "height": "1080",
    "video": {
      "fps": 120,
      "status": "READY"
    }
  },
  "filename": "VID_20181126_174327.mp4"
}

These are the headers received from the HEAD request to baseUrl:

{
  "access-control-expose-headers": "Content-Length",
  "etag": "\"v15ceb\"",
  "expires": "Fri, 01 Jan 1990 00:00:00 GMT",
  "cache-control": "private, max-age=86400, no-transform",
  "content-disposition": "inline;filename=\"VID_20181126_174327.jpg\"",
  "content-type": "image/jpeg",
  "vary": "Origin",
  "x-content-type-options": "nosniff",
  "date": "Wed, 08 May 2019 17:39:42 GMT",
  "server": "fife",
  "content-length": "31652",
  "x-xss-protection": "0",
  "alt-svc": "quic=\":443\"; ma=2592000; v=\"46,44,43,39\"",
  "status": "200",
  "content-location": "https://lh3.googleusercontent.com/lr/ABC"
}

Thanks.

回答1:

^{This is in the wrong language from the OP, but I assume translating to a Python cURL call is a straightforward task.}

I successfully used the function below to retrieve Google Photos image and video files sizes by calling it with the file's baseUrl, as retrieved from the API:

function retrieve_remote_file_size($url){
     $ch = curl_init($url);

     curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
     curl_setopt($ch, CURLOPT_HEADER, TRUE);
     curl_setopt($ch, CURLOPT_NOBODY, TRUE);

     $data = curl_exec($ch);
     $size = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);

     curl_close($ch);
     return $size;
}

^(Source)

Note that (contrary to the "Warning" at the above baseUrl link) I did not need to specify a width/height or download parameter in order for the baseUrl to work with this function.

来源：https://stackoverflow.com/questions/56046574/retrieve-file-size-for-videos-stored-on-google-photos