fix "modifer" -> "modifier" typo everywhere

proxychain/requestmodifiers/spoof_referrer.go

@@ -0,0 +1,38 @@
+package requestmodifiers
+
+import (
+	"fmt"
+
+	"ladder/proxychain"
+	tx "ladder/proxychain/responsemodifiers"
+)
+
+// SpoofReferrer modifies the referrer header.
+// It is useful if the page can be accessed from a search engine
+// or social media site, but not by browsing the website itself.
+// if url is "", then the referrer header is removed.
+func SpoofReferrer(url string) proxychain.RequestModification {
+	return func(chain *proxychain.ProxyChain) error {
+		// change refer on client side js
+		script := fmt.Sprintf(`document.referrer = "%s"`, url)
+		chain.AddOnceResponseModifications(
+			tx.InjectScriptBeforeDOMContentLoaded(script),
+		)
+
+		if url == "" {
+			chain.Request.Header.Del("referrer")
+			return nil
+		}
+		chain.Request.Header.Set("referrer", url)
+		return nil
+	}
+}
+
+// HideReferrer modifies the referrer header
+// so that it is the original referrer, not the proxy
+func HideReferrer() proxychain.RequestModification {
+	return func(px *proxychain.ProxyChain) error {
+		px.Request.Header.Set("referrer", px.Request.URL.String())
+		return nil
+	}
+}