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Can we get md5sum of a file from its info without downloading it?

See original GitHub issue

For example gdrive has a feature to obtain the md5sum of a single file such as a tar.gz, which will help to verify its md5sum hash before downloading it.

$ gdrive info 1Qhn-_Zh5EY4NHcQASCvASUzioOd2jH42
Id: 1Qhn-_Zh5EY4NHcQASCvASUzioOd2jH42
Name: QmSSNXFKFF2H6oJ37g3ZUAg58TWWWZY3wY8nPzCPAAyybU.tar.gz
Path: QmSSNXFKFF2H6oJ37g3ZUAg58TWWWZY3wY8nPzCPAAyybU.tar.gz
Mime: application/gzip
Size: 159.0 B
Created: 2019-09-26 11:10:42
Modified: 2019-09-26 11:10:44
Md5sum: 5ca2c9bc2d1b2c0fd6c03bd038d6066a
Shared: True
Parents: 0AIbqFF7bUOe8Uk9PVA
ViewUrl: https://drive.google.com/file/d/1Qhn-_Zh5EY4NHcQASCvASUzioOd2jH42/view?usp=drivesdk
DownloadUrl: https://drive.google.com/uc?id=1Qhn-_Zh5EY4NHcQASCvASUzioOd2jH42&export=download

[Q] Does/can pyocclient provide similar approach?

Issue Analytics

State:
Created 4 years ago
Comments:16 (6 by maintainers)

Top GitHub Comments

1reaction

scycommented, Mar 2, 2022

Basically, you should be able to retrieve the checksums using something like this:

>>> client.file_info("/myfile.mp4", ["oc:checksums"]).attributes
{'{http://owncloud.org/ns}checksums': None}

Why is it None? Does the server not have any checksums for my file? Yes it does, you can check by running the request manually:

>>> client._session.request("PROPFIND", client._webdav_url + "/myfile.mp4", data='<?xml version="1.0" encoding="utf-8" ?><a:propfind xmlns:a="DAV:" xmlns:oc="http://owncloud.org/ns"><a:prop><oc:checksums/></a:prop></a:propfind>').content
b'<?xml version="1.0"?>\n<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns"><d:response><d:href>/public.php/webdav/myfile.mp4</d:href><d:propstat><d:prop><oc:checksums><oc:checksum>SHA1:22df8f2cde13f524aa3c5282cd97f85e14144b55 MD5:149f3471328e79e2cb93fdde6be42450 ADLER32:1cda0a57</oc:checksum></oc:checksums></d:prop><d:status>HTTP/1.1 200 OK</d:status></d:propstat></d:response></d:multistatus>\n'

The problem here is that the <oc:checksums> element contains an embedded <oc:checksum> element (singular). But since Client._parse_dav_element only checks for text nodes that are direct children of the returned property, it doesn’t find the checksums in the returned XML.

@PVince81, this could be fixed by implementing special handling for oc:checksums (because other properties like oc:fileid or oc:owner-id don’t have that additional wrapper), or by beefing up _parse_dav_element to find text nodes recursively. I don’t have time for a PR right now though, sorry.

0reactions

avatar-lavventuracommented, Dec 1, 2021

@PVince81 is the PR merge into latest version of pyocclient? When I fetch file info I am not able to see its md5sum

I get following output:

File(path=/5760616759ab148e9633f0dfe2095040/5760616759ab148e9633f0dfe2095040.tar.gz,file_type=file,attributes={'{DAV:}getlastmodified': 'Wed, 01 Dec 2021 19:22:50 GMT', '{DAV:}getcontentlength': '156105780', '{DAV:}resourcetype': None, '{DAV:}getetag': '"dca03dee180caa17dfdc62f82ab5ece7"', '{DAV:}getcontenttype': 'application/x-gzip'})

Is there any other function that I should use to fetch the md5sum? Should I call file_info() with a property flag?