VCARD: Data-URL for base64-encoded photo

[lbuchs]

according to RFC 6350 you can use a base64 data-url (RFC 2397) for photos:

       PHOTO:data:image/jpeg;base64,MIICajCCAdOgAwIBAgICBEUwDQYJKoZIhv
        AQEEBQAwdzELMAkGA1UEBhMCVVMxLDAqBgNVBAoTI05ldHNjYXBlIENvbW11bm
        ljYXRpb25zIENvcnBvcmF0aW9uMRwwGgYDVQQLExNJbmZvcm1hdGlvbiBTeXN0
        <...remainder of base64-encoded data...>

Source: https://datatracker.ietf.org/doc/html/rfc6350#section-6.2.4

But this cannot be read by Outlook CalDav Synchronizer; the following error is logged:

<MappingWarnings>
     <string>Could not load picture for contact.</string>
</MappingWarnings>

Outlook CalDav Synchronizer works with the following format:

       PHOTO;ENCODING=b;TYPE=JPEG:MIICajCCAdOgAwIBAgICBEUwDQYJKoZIhv
        AQEEBQAwdzELMAkGA1UEBhMCVVMxLDAqBgNVBAoTI05ldHNjYXBlIENvbW11bm
        ljYXRpb25zIENvcnBvcmF0aW9uMRwwGgYDVQQLExNJbmZvcm1hdGlvbiBTeXN0
        <...remainder of base64-encoded data...>

Thunderbird only accepts the data url, so at the moment there is no compatible variant. It would be great if Outlook CalDav Synchronizer can read the data-url.

[aluxnimm]

interesting, should be possible to implement I guess.