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Payload encoding detection #1933

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Payload encoding detection#1933
@guilhem

Description

@guilhem
guilhem
opened on Sep 6, 2024

Feature Request

Environment

I'm using flatcar on Akamai Linode

Desired Feature

Payload is limited in size.
Currently, we are uploading ignition.json with a base64 encoding.
But it can be oversize the limit, so we are/want to use a gzip content.

I see VMware have already this:

ignition/internal/providers/vmware/vmware.go

Lines 33 to 55 in 3b3a27b

func decodeConfig(config config) ([]byte, error) {
switch config.encoding {
case "":
return []byte(config.data), nil
case "b64", "base64":
return decodeBase64Data(config.data)
case "gz", "gzip":
return decodeGzipData(config.data)
case "gz+base64", "gzip+base64", "gz+b64", "gzip+b64":
gz, err := decodeBase64Data(config.data)
if err != nil {
return nil, err
}
return decodeGzipData(string(gz))
}
return nil, fmt.Errorf("unsupported encoding %q", config.encoding)
}

And other ticket are for specific providers #1096

Can we add a generic way to detect payload (b64 / gzip+b64 / zstd+b64...)

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