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filter.go
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filter.go
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package wbot
import (
"regexp"
"github.com/twiny/wbot/pkg/api"
)
var (
badExtensions = regexp.MustCompile(`\.(png|jpg|jpeg|gif|ico|eps|pdf|iso|mp3|mp4|zip|aif|mpa|wav|wma|7z|deb|pkg|rar|rpm|bin|dmg|dat|tar|exe|ps|psd|svg|tif|tiff|pps|ppt|pptx|xls|xlsx|wmv|doc|docx|txt|mov|mpl|css|js)$`)
)
type (
filter struct {
rules map[string]*api.FilterRule
}
)
func newFilter(rules ...*api.FilterRule) *filter {
f := &filter{
rules: make(map[string]*api.FilterRule),
}
for _, rule := range rules {
f.rules[rule.Hostname] = rule
}
return f
}
func (f *filter) allow(u *api.ParsedURL) bool {
if badExtensions.MatchString(u.URL.Path) {
return false
}
rule, found := f.rules[u.Root]
if !found {
// check if there is a wildcard rule
rule, found = f.rules["*"]
if !found {
return true
}
}
for _, pattern := range rule.Disallow {
if pattern.MatchString(u.URL.String()) {
return false
}
}
for _, pattern := range rule.Allow {
if pattern.MatchString(u.URL.String()) {
return true
}
}
return false // default deny
}