tests: convert base64 data to %b64[]

[bagder]

To make it easier to read and understand tests - and grep them.

Perl script for the conversion. Provide the base64 blob as an argument on the command line:

use MIME::Base64;

# encode non-printable and <> into %XX
sub encode {
    my ($l) = @_;
    $l =~ s/([^\x20-\x7f]|\x3c|\x3e)/sprintf "%%%02x", ord $1/eg;
    return $l;
}

my $b = $ARGV[0];
my $o = decode_base64($b);
my $e = encode($o);
print "%b64[$e]b64%\n";

[Copilot]

Pull request overview

This PR updates curl’s protocol test definitions to replace opaque base64 blobs with the test-runner’s inline %b64[... ]b64% expansion syntax, improving readability and making auth payloads easier to search/grep.

Changes:

• Convert SMTP/POP3/IMAP AUTH payloads from raw base64 to %b64[... ]b64% in many tests/data/test* files.
• Represent binary delimiters explicitly using %NN escapes (e.g., %00, %01) inside the %b64[...]b64% blocks.
• Update DIGEST-MD5 challenges/responses similarly to be human-readable pre-encoding.

Reviewed changes

Copilot reviewed 34 out of 34 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/data/test992	Replace XOAUTH2 base64 payloads with %b64[...]b64% for SMTP server/client exchange.
tests/data/test937	Replace AUTH PLAIN base64 payloads with %b64[%00... ]b64% for SMTP.
tests/data/test936	Replace AUTH PLAIN base64 payloads with %b64[%00... ]b64% for SMTP.
tests/data/test935	Replace AUTH PLAIN base64 payloads with %b64[%00... ]b64% for SMTP.
tests/data/test922	Replace XOAUTH2 base64 initial response with %b64[...]b64% for SMTP.
tests/data/test920	Replace AUTH LOGIN password prompt/response base64 with %b64[...]b64% for SMTP.
tests/data/test919	Replace AUTH PLAIN base64 initial response with %b64[%00... ]b64% for SMTP.
tests/data/test908	Replace XOAUTH2 base64 payloads with %b64[...]b64% for SMTP server/client exchange.
tests/data/test907	Replace DIGEST-MD5 base64 challenge/response fields with %b64[...]b64% for SMTP.
tests/data/test904	Replace AUTH LOGIN password prompt/response base64 with %b64[...]b64% for SMTP.
tests/data/test903	Replace AUTH PLAIN base64 payloads with %b64[%00... ]b64% for SMTP.
tests/data/test892	Replace POP3 AUTH PLAIN base64 payloads with %b64[...]b64% including %00 separators.
tests/data/test881	Replace POP3 AUTH PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test880	Replace POP3 AUTH PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test879	Replace POP3 AUTH PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test874	Replace POP3 XOAUTH2 base64 initial response with %b64[...]b64%.
tests/data/test872	Replace POP3 AUTH LOGIN prompt/response base64 with %b64[...]b64%.
tests/data/test871	Replace POP3 AUTH PLAIN base64 initial response with %b64[%00... ]b64%.
tests/data/test870	Replace POP3 XOAUTH2 base64 payloads with %b64[...]b64% for server/client exchange.
tests/data/test869	Replace POP3 DIGEST-MD5 base64 challenge/response fields with %b64[...]b64%.
tests/data/test866	Replace POP3 AUTH LOGIN prompt/response base64 with %b64[...]b64%.
tests/data/test865	Replace POP3 AUTH PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test848	Replace IMAP AUTHENTICATE PLAIN base64 payloads with %b64[...]b64% including %00 separators.
tests/data/test835	Replace IMAP AUTHENTICATE PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test834	Replace IMAP AUTHENTICATE PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test833	Replace IMAP AUTHENTICATE PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test828	Replace IMAP AUTHENTICATE XOAUTH2 base64 initial response with %b64[...]b64%.
tests/data/test826	Replace IMAP AUTHENTICATE LOGIN prompt/response base64 with %b64[...]b64%.
tests/data/test825	Replace IMAP AUTHENTICATE PLAIN base64 initial response with %b64[%00... ]b64%.
tests/data/test824	Replace IMAP XOAUTH2 base64 payloads with %b64[...]b64% for server/client exchange.
tests/data/test823	Replace IMAP DIGEST-MD5 base64 challenge/response fields with %b64[...]b64%.
tests/data/test820	Replace IMAP AUTHENTICATE LOGIN prompt/response base64 with %b64[...]b64%.
tests/data/test819	Replace IMAP AUTHENTICATE PLAIN base64 payloads with %b64[%00... ]b64%.
tests/data/test779	Replace IMAP XOAUTH2 base64 initial response with %b64[...]b64% (but see review comment).

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[testclutch]

Analysis of PR #20547 at eb86b4fe:

Test ../../tests/http/test_12_reuse.py::TestReuse::test_12_01_h1_conn_close[http/1.1] failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 2 different CI jobs (the link just goes to one of them).

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