This is a fork of Apache mod_line_edit from webthing.
Main focus is to make this more efficient for searching and replacing absolute URL, which does not really need a context aware parser. For relative URL, it is best to use a module with parser like mod_proxy_html.
- Allow at most one match per position. Original implementation split a matched line as three lines, before + matched + after. And the rest rules will be applied to these new lines, too, which may cause multiple match and substitution in the same position. This is clearly not users' intention. The new implementation skips further rule matching once a match is found. The rule matching is in the order of its appearance in the conf file.
- Add flag v to LERewriteRule to interpolate the 'from' part of the rule.
- Add 'cond' to LERewriteRule just like ProxyHTMLURLMap in mod_proxy_html to conditionally enable/disable rules based on environment variable. Quote from mod_proxy_html,
The optional cond argument specifies a condition to test before the parse. If a condition is unsatisfied, the URLMap will be ignored in this parse.
The condition takes the form [!]var[=val], and is satisfied if the value of environment variable var is val. If the optional =val is omitted, then any value of var satisfies the condition, provided only it is set to something. If the first character is !, the condition is reversed.
- Added flag 's/e/E' to LERewriteRule to mark for line start/end/exclusive. The 'to' part of the rule is ignored. 'E' when combined with 's' or 'e' means to exclude the matched string when capturing the line, which is achievable with look-ahead in regular expression, but not in plain search and substitution. When line-end rule is given, LELineEnd is ignored. ** e.g. to capture host name in URL, see the following rules. http://www.example.com/a/b will be captured as www.example.com, passed to other rules for matching. The other characters will be passed downstream unchanged.
# line start.
LERewriteRule (?:ftp|http|https):// - EiRs #line start
# line end.
# ':' for port or credential,
# '@' for credential,
# '%' for ecoding,
# '[]' for ipv6
LERewriteRule [^a-zA-Z0-9_.~%:\[\]@-] - ERe
- Avoid Apache's ap_regexec and go direct with libpcre's pcre_exec. This avoids string copy because ap_regexe requires a null terminated string.
- Added line start and end customization to reduce length of the buffer fed to rewrite rules.
- Avoid unnecessary bucket flattening using PCRE_PARTIAL for partial regex match.