looks mostly good, one high level comment, and a few nits inline:

do we really need the 'detect-compression' parameter?

when wouldn't we want that? also the gui always enables that for isos anyway?
if there is a good reason, that would be nice to have in a commit message

if we can always use the detection, we don't have to give the parameter in the 
gui
and save a few lines and an additional api parameter we have to bring with us 
for a long time ;)

On 8/14/23 16:42, Philipp Hufnagl wrote:
extends the query_url_metadata callback with the functionallity to
detect used compressions. If a compression is used it tells the ui which
one

Signed-off-by: Philipp Hufnagl <p.hufn...@proxmox.com>
---
  PVE/API2/Nodes.pm | 20 ++++++++++++++++++++
  1 file changed, 20 insertions(+)

diff --git a/PVE/API2/Nodes.pm b/PVE/API2/Nodes.pm
index 5a148d1d..66a8bb0b 100644
--- a/PVE/API2/Nodes.pm
+++ b/PVE/API2/Nodes.pm
@@ -1564,6 +1564,12 @@ __PACKAGE__->register_method({
                type => 'boolean',
                optional => 1,
                default => 1,
+           },
+           'detect-compression' => {
+               description => "If true an auto detect of used compression will be 
attempted",
+               type => 'boolean',
+               optional => 1,
+               default => 0,
            }
        },
      },
@@ -1583,6 +1589,11 @@ __PACKAGE__->register_method({
                type => 'string',
                optional => 1,
            },
+           compression => {
+               type => 'string',
+               enum => $PVE::Storage::Plugin::KNOWN_COMPRESSION_FORMATS,

if you use this, you have to import it with a 'use' statement at the top of the 
package
in this case it works because the storage part includes it already, but should 
that change
it would not work anymore

+               optional => 1,
+           },
        },
      },
      code => sub {
@@ -1606,6 +1617,8 @@ __PACKAGE__->register_method({
            );
        }
+ my $detect_compression = $param->{'detect-compression'};
+

if we decide to leave the parameter in, i'd prefer to set the default here:

my $detect_compression = $param->{'detect-compression'} // 0;


(it works fine without that, but now i don't have to guess what the default should be without looking at the parameter description)

        my $req = HTTP::Request->new(HEAD => $url);
        my $res = $ua->request($req);
@@ -1615,6 +1628,7 @@ __PACKAGE__->register_method({
        my $disposition = $res->header("Content-Disposition");
        my $type = $res->header("Content-Type");
+ my $compression;
        my $filename;
if ($disposition && ($disposition =~ m/filename="([^"]*)"/ || $disposition =~ m/filename=([^;]*)/)) {
@@ -1628,10 +1642,16 @@ __PACKAGE__->register_method({
            $type = $1;
        }
+ if ($detect_compression && $filename =~ m!^(.+)\.(${\PVE::Storage::Plugin::COMPRESSOR_RE})$!) {
+           $filename = $1;
+           $compression = $2;
+       }
+
        my $ret = {};
        $ret->{filename} = $filename if $filename;
        $ret->{size} = $size + 0 if $size;
        $ret->{mimetype} = $type if $type;
+       $ret->{compression} = $compression if $compression;
return $ret;
      }});



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