fix "modifer" -> "modifier" typo everywhere

proxychain/requestmodifiers/request_archive_is.go

@@ -0,0 +1,47 @@
+package requestmodifiers
+
+import (
+	"fmt"
+	"net/url"
+	"regexp"
+
+	"ladder/proxychain"
+	tx "ladder/proxychain/responsemodifiers"
+)
+
+const archivistUrl string = "https://archive.is/latest"
+
+// RequestArchiveIs modifies a ProxyChain's URL to request an archived version from archive.is
+func RequestArchiveIs() proxychain.RequestModification {
+	return func(chain *proxychain.ProxyChain) error {
+		rURL := preventRecursiveArchivistURLs(chain.Request.URL.String())
+		chain.Request.URL.RawQuery = ""
+		newURL, err := url.Parse(fmt.Sprintf("%s/%s", archivistUrl, rURL))
+		if err != nil {
+			return err
+		}
+
+		// archivist seems to sabotage requests from cloudflare's DNS
+		// bypass this just in case
+		chain.AddOnceRequestModifications(ResolveWithGoogleDoH())
+
+		chain.Request.URL = newURL
+
+		// cleanup archivst headers
+		script := `[...document.querySelector("body > center").childNodes].filter(e => e.id != "SOLID").forEach(e => e.remove())`
+		chain.AddOnceResponseModifications(
+			tx.InjectScriptAfterDOMContentLoaded(script),
+		)
+		return nil
+	}
+}
+
+// https://archive.is/20200421201055/https://rt.live/ -> http://rt.live/
+func preventRecursiveArchivistURLs(url string) string {
+	re := regexp.MustCompile(`https?:\/\/archive\.is\/\d+\/(https?:\/\/.*)`)
+	match := re.FindStringSubmatch(url)
+	if match != nil {
+		return match[1]
+	}
+	return url
+}