refactor scraper into modules

1 files changed, 62 insertions, 0 deletions

diff --git a/modules/domainfilter/domainfilter.go b/modules/domainfilter/domainfilter.go
new file mode 100644
index 0000000..b892882
--- /dev/null
+++ b/modules/domainfilter/domainfilter.go
@@ -0,0 +1,62 @@
+// 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 domainfilter
+
+import (
+	"github.com/nlnwa/whatwg-url/url"
+	"github.com/philippta/flyscrape"
+)
+
+func init() {
+	flyscrape.RegisterModule(new(Module))
+}
+
+type Module struct {
+	URL            string   `json:"url"`
+	AllowedDomains []string `json:"allowedDomains"`
+	BlockedDomains []string `json:"blockedDomains"`
+}
+
+func (m *Module) ID() string {
+	return "domainfilter"
+}
+
+func (m *Module) OnLoad(v flyscrape.Visitor) {
+	if u, err := url.Parse(m.URL); err == nil {
+		m.AllowedDomains = append(m.AllowedDomains, u.Host())
+	}
+}
+
+func (m *Module) CanRequest(rawurl string, depth int) bool {
+	u, err := url.Parse(rawurl)
+	if err != nil {
+		return false
+	}
+
+	host := u.Host()
+	ok := false
+
+	for _, domain := range m.AllowedDomains {
+		if domain == "*" || host == domain {
+			ok = true
+			break
+		}
+	}
+
+	for _, domain := range m.BlockedDomains {
+		if host == domain {
+			ok = false
+			break
+		}
+	}
+
+	return ok
+}
+
+var (
+	_ flyscrape.Module     = (*Module)(nil)
+	_ flyscrape.CanRequest = (*Module)(nil)
+	_ flyscrape.OnLoad     = (*Module)(nil)
+)