improve injections

handlers/proxy.go

@@ -166,7 +166,15 @@ func applyRules(domain string, path string, body string) string {
 			if err != nil {
 				log.Fatal(err)
 			}
-			doc.Find(injection.Position).AppendHtml(injection.Code)
+			if injection.Replace != "" {
+				doc.Find(injection.Position).ReplaceWithHtml(injection.Replace)
+			}
+			if injection.Append != "" {
+				doc.Find(injection.Position).AppendHtml(injection.Append)
+			}
+			if injection.Prepend != "" {
+				doc.Find(injection.Position).PrependHtml(injection.Prepend)
+			}
 			body, err = doc.Html()
 			if err != nil {
 				log.Fatal(err)
@@ -189,6 +197,8 @@ type RuleSet []struct {
 	RegexRules  []Rule `yaml:"regexRules"`
 	Injections  []struct {
 		Position string `yaml:"position"`
-		Code     string `yaml:"code"`
+		Append   string `yaml:"append"`
+		Prepend  string `yaml:"prepend"`
+		Replace  string `yaml:"replace"`
 	} `yaml:"injections"`
 }

ruleset.yaml

@@ -4,7 +4,7 @@
       replace: <script $1 script="/https://www.example.com/$3"
   injections:
     - position: head # Position where to inject the code
-      code: | 
+      append: | 
         <script>
           window.localStorage.clear();
           console.log("test");
@@ -18,8 +18,8 @@
       replace: <script $1 script="/https://www.example.com/$3"
   injections:
     - position: .left-content article .post-title # Position where to inject the code into DOM
-      code: | 
+      replace: | 
-        <script>
+        <h1>My Custom Title</h1>
-          window.localStorage.clear();
+    - position: .left-content article # Position where to inject the code into DOM
-          console.log("test");
+      prepend: | 
-        </script>
+        <h2>Suptitle</h2>