Remove feature for custom threat file

This change removes the `CustomThreatsPath` setting from the threat feed configuration. The default configuration files are updated with this setting removed.

configs/default-config.xml

@@ -13,7 +13,6 @@
     <databasePath>/opt/deceptifeed/logs/threatfeed.csv</databasePath>
     <threatExpiryHours>336</threatExpiryHours>
     <includePrivateIPs>false</includePrivateIPs>
-    <customThreatsPath></customThreatsPath>
     <excludeListPath></excludeListPath>
   </threatFeed>
 

configs/docker-config.xml

@@ -13,7 +13,6 @@
     <databasePath>threatfeed.csv</databasePath>
     <threatExpiryHours>336</threatExpiryHours>
     <includePrivateIPs>false</includePrivateIPs>
-    <customThreatsPath></customThreatsPath>
     <excludeListPath></excludeListPath>
   </threatFeed>
 

internal/config/config.go

@@ -142,7 +142,6 @@ type ThreatFeed struct {
 	DatabasePath      string `xml:"databasePath"`
 	ExpiryHours       int    `xml:"threatExpiryHours"`
 	IsPrivateIncluded bool   `xml:"includePrivateIPs"`
-	CustomThreatsPath string `xml:"customThreatsPath"`
 	ExcludeListPath   string `xml:"excludeListPath"`
 }
 

internal/threatfeed/handler.go

@@ -40,21 +40,6 @@ func handlePlain(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-
-	// If a custom threat file is supplied in the configuration, append the
-	// contents of the file to the HTTP response. To allow for flexibility, the
-	// contents of the file are not parsed or validated.
-	if len(cfg.ThreatFeed.CustomThreatsPath) > 0 {
-		data, err := os.ReadFile(cfg.ThreatFeed.CustomThreatsPath)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "Failed to read custom threats file:", err)
-			return
-		}
-		_, err = w.Write(data)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "Failed to serve threat feed:", err)
-		}
-	}
 }
 
 // handleJSON handles HTTP requests to serve the full threat feed in JSON