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Add Special Regex for http_x_forwarded_for Var #37

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Add Special Regex for http_x_forwarded_for Var #37

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e0856f9
Add Special Regex for http_x_forwarded_for Var
jasonrogena Jan 17, 2018
da96e7e
Add remote_user Special Regex
jasonrogena Mar 2, 2018
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23 changes: 21 additions & 2 deletions parser.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,11 +19,30 @@ type Parser struct {
regexp *regexp.Regexp
}

func getSpecialNginxRegexes() map[string]string {
return map[string]string{
"http_x_forwarded_for": `[^ ]*(, [^ ]+)*`,
"remote_user": `[^"]*`}
}

// NewParser returns a new Parser, use given log format to create its internal
// strings parsing regexp.
func NewParser(format string) *Parser {
re := regexp.MustCompile(`\\\$([a-z_]+)(\\?(.))`).ReplaceAllString(
regexp.QuoteMeta(format+" "), "(?P<$1>[^$3]*)$2")
formatRegex := regexp.MustCompile(`([^ ]*)\$([a-z_]+)([^ ]*)([ ]?)`)
specialNginxRegexes := getSpecialNginxRegexes()
fields := formatRegex.FindAllStringSubmatch(format+" ", -1)
re := formatRegex.ReplaceAllString(format+" ", "$2$4")
for _, field := range fields {
terminateChar := field[3]
if len([]rune(terminateChar)) == 0 {
terminateChar = field[4]
}
if specialRegex, found := specialNginxRegexes[field[2]]; found {
re = strings.Replace(re, field[2]+field[4], regexp.QuoteMeta(field[1])+"(?P<"+field[2]+">"+specialRegex+")"+regexp.QuoteMeta(field[3])+field[4], 1)
} else {
re = strings.Replace(re, field[2]+field[4], regexp.QuoteMeta(field[1])+"(?P<"+field[2]+">[^"+terminateChar+"]*)"+regexp.QuoteMeta(field[3]+field[4]), 1)
}
}
return &Parser{format, regexp.MustCompile(fmt.Sprintf("^%v", strings.Trim(re, " ")))}
}

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