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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package urlfilter
import (
"regexp"
"github.com/philippta/flyscrape"
)
func init() {
flyscrape.RegisterModule(new(Module))
}
type Module struct {
URL string `json:"url"`
AllowedURLs []string `json:"allowedURLs"`
BlockedURLs []string `json:"blockedURLs"`
allowedURLsRE []*regexp.Regexp
blockedURLsRE []*regexp.Regexp
}
func (m *Module) OnLoad(v flyscrape.Visitor) {
for _, pat := range m.AllowedURLs {
re, err := regexp.Compile(pat)
if err != nil {
continue
}
m.allowedURLsRE = append(m.allowedURLsRE, re)
}
for _, pat := range m.BlockedURLs {
re, err := regexp.Compile(pat)
if err != nil {
continue
}
m.blockedURLsRE = append(m.blockedURLsRE, re)
}
}
func (m *Module) CanRequest(rawurl string, depth int) bool {
// allow root url
if rawurl == m.URL {
return true
}
// allow if no filter is set
if len(m.allowedURLsRE) == 0 && len(m.blockedURLsRE) == 0 {
return true
}
ok := false
if len(m.allowedURLsRE) == 0 {
ok = true
}
for _, re := range m.allowedURLsRE {
if re.MatchString(rawurl) {
ok = true
break
}
}
for _, re := range m.blockedURLsRE {
if re.MatchString(rawurl) {
ok = false
break
}
}
return ok
}
var (
_ flyscrape.CanRequest = (*Module)(nil)
_ flyscrape.OnLoad = (*Module)(nil)
)
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