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package skate
import (
"index/suffixarray"
"regexp"
"sort"
"strings"
)
var (
patNonWordDomain = regexp.MustCompile(`(https?:\/\/)([^\w]*)(.*)`)
patRepeatedHttpSlashes = regexp.MustCompile(`(https?:\/\/)(\/)*(.*)`)
patHttpDOI = regexp.MustCompile(`(https?:\/\/)(10[.][0-9]{1,8}\/.*)`)
patAccessedOn = regexp.MustCompile(`(?iU)(.*)[.;,]?(abgerufen|acces-sed|últimoacesso|updated|ac-cessed|zugegriffen|diunduh|adresinden|sayfasındanulaşıl|accessedon|consultéle|consultad|diaksestanggal|diaksespadatanggal|diakses|dateofaccess|lastaccessed|acesso|acessado|accessoem|accessed|recibido|accessedat|доступ-свободный|датаобращения|pageconsulté|indirme|downloadedfrom).*$`)
patFileExtraSuffix = regexp.MustCompile(`(?i)(http.*[.](pdf\+html|zip|pdf|html|doc|docx|rar))([^?]*)$`)
patBrokenHttpSchema = regexp.MustCompile(`^https?[^://]*?.*`)
patBrokenSchemaPrefix = regexp.MustCompile(`(http|https)\W+(.*)`)
// Note: [...] and naming things, https://stackoverflow.com/q/56297974/89391.
okPrefixes = []string{"http://", "https://", "ftp://"}
)
// SanitizeURL applies various cleanup rules on URLs (as they are found e.g. in
// references extracted with GROBID). Returns an empty string when no URL could
// be discovered. Still, many results will not be valid links even after
// sanitization. This is a surprisingly expensive operation, roughly processing
// 20k urls/s, only. A short circuit with a successful url.Parse does not
// really work, as syntactically valid URL strings may still be improbable
// URLs, e.g. http://!!!x.com, etc.
func SanitizeURL(s string) string {
if !HasAnyPrefix(s, okPrefixes) {
s = sanitizeRaw(s)
if s == "" {
return s
}
}
index := suffixarray.New([]byte(s)) // seems to only be about 15% of total time spent
indices := index.Lookup([]byte("http"), -1)
if len(indices) == 1 {
// ISSN-2177-4129periodicos.ufpel.edu.br/ojs2/index.php/Memoriahttp://dx.doi.org/10.15210/rmr.v8i14.7485
s = s[indices[0]:]
} else if len(indices) > 1 {
sort.Ints(indices)
// http://ailab.ist.psu.edu/bcpred/SVMTriP:http://sysbio.unl.edu/SVMTriP/prediction.phpBcell
s = s[indices[0]:indices[1]]
s = strings.TrimRight(s, ":")
s = strings.TrimRight(s, ";")
}
// http://!!!:, // http://!, // http://"
s = patNonWordDomain.ReplaceAllString(s, `$1$3`)
// http:///en.m.wikipedia.org/ChenLong
s = patRepeatedHttpSlashes.ReplaceAllString(s, `$1$3`)
// http://10.1113/jphysiol.2002.026047
s = patHttpDOI.ReplaceAllString(s, `https://doi.org/$2`)
// .Acesso:11Abr, accessedon15, ...
if patAccessedOn.MatchString(s) {
s = patAccessedOn.ReplaceAllString(s, `$1`)
}
// http://140.120.197.173/Ecology/Download/Timing-MSChart.zipJournalofInsectScience
if patFileExtraSuffix.MatchString(s) {
s = patFileExtraSuffix.ReplaceAllString(s, `$1`)
}
return s
}
func sanitizeRaw(s string) string {
if len(s) < 4 {
return ""
}
if !strings.Contains(s, ".") {
return ""
}
index := suffixarray.New([]byte(s))
indices := index.Lookup([]byte("www."), 1)
sort.Ints(indices)
if len(indices) > 0 {
return "http://" + s[indices[0]:]
}
if patBrokenSchemaPrefix.MatchString(s) {
return patBrokenSchemaPrefix.ReplaceAllString(s, `http://$2`)
}
return "http://" + s
}
// HasAnyPrefixes returns true, if any of the prefixes matches string s.
func HasAnyPrefix(s string, prefix []string) bool {
for _, p := range prefix {
if strings.HasPrefix(s, p) {
return true
}
}
return false
}
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