read key from env if provided (projectdiscovery#1607)

* read key from env if provided

* remove debug code

Author: dogancanbakir

v2/pkg/passive/sources.go

@@ -1,6 +1,8 @@
 package passive
 
 import (
+	"fmt"
+	"os"
 	"strings"
 
 	"golang.org/x/exp/maps"
@@ -168,6 +170,15 @@ func New(sourceNames, excludedSourceNames []string, useAllSources, useSourcesSup
 		}
 	}
 
+	// TODO: Consider refactoring this to avoid potential duplication issues
+	for _, source := range sources {
+		if source.NeedsKey() {
+			if apiKey := os.Getenv(fmt.Sprintf("%s_API_KEY", strings.ToUpper(source.Name()))); apiKey != "" {
+				source.AddApiKeys([]string{apiKey})
+			}
+		}
+	}
+
 	// Create the agent, insert the sources and remove the excluded sources
 	agent := &Agent{sources: maps.Values(sources)}