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f3fc68e3a2
Some use cases benefit from reversing a string before passing it to other converters or lookups. While reverse_dom addresses domain-specific label reversal, a generic byte-wise string reversal remains useful on its own and can also be combined with other converters such as concat(). A common lookup use case is turning a suffix match on the original string into a prefix match on the reversed string. Prefix string matches use the prefix-tree index (PAT_MATCH_BEG with pat_idx_tree_pfx), while end matches use the string-list index (PAT_MATCH_END with pat_idx_list_str), so reversing before map_beg can avoid linear suffix scans for large maps. This patch adds a new string converter named "reverse". It reverses the input string byte by byte and returns the resulting string unchanged otherwise. It does not apply any domain-specific semantics or character-encoding semantics. The documentation is updated and a reg-test is added to cover the basic conversion as well as a simple composition with concat(.).
41 lines
978 B
Text
41 lines
978 B
Text
varnishtest "reverse converter test"
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feature ignore_unknown_macro
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server s1 {
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rxreq
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txresp -hdr "Connection: close"
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} -repeat 4 -start
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haproxy h1 -conf {
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global
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.if feature(THREAD)
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thread-groups 1
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.endif
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defaults
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mode http
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timeout connect "${HAPROXY_TEST_TIMEOUT-5s}"
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timeout client "${HAPROXY_TEST_TIMEOUT-5s}"
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timeout server "${HAPROXY_TEST_TIMEOUT-5s}"
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frontend fe
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bind "fd@${fe}"
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http-request return status 200 hdr X-Reverse "%[str(example.com),reverse]" hdr X-Reverse2 "%[str(ab cd),reverse]" hdr X-Reverse3 "%[str(example.com),reverse,concat(.)]" hdr X-Reverse4 "%[str(),reverse]"
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default_backend be
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backend be
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server s1 ${s1_addr}:${s1_port}
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} -start
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client c1 -connect ${h1_fe_sock} {
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txreq -url "/"
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rxresp
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expect resp.status == 200
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expect resp.http.x-reverse == "moc.elpmaxe"
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expect resp.http.x-reverse2 == "dc ba"
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expect resp.http.x-reverse3 == "moc.elpmaxe."
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expect resp.http.x-reverse4 == "<undef>"
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} -run
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