Incorporate DNSWL (whitelist) grade into blacklist scoring

CalculateScore now accepts a forWhitelist flag to handle whitelist
scoring logic separately. The final blacklist grade combines both
RBL and DNSWL results using MinGrade for a more accurate reputation
assessment.

pkg/analyzer/analyzer.go

@@ -138,7 +138,7 @@ func (a *APIAdapter) CheckBlacklistIP(ip string) ([]api.BlacklistCheck, []api.Bl
 		IPsChecked:  []string{ip},
 		ListedCount: listedCount,
 	}
-	score, grade := a.analyzer.generator.rblChecker.CalculateScore(results)
+	score, grade := a.analyzer.generator.rblChecker.CalculateScore(results, false)
 
 	// Check the IP against all configured DNSWLs (informational only)
 	whitelists, _, err := a.analyzer.generator.dnswlChecker.CheckIP(ip)

pkg/analyzer/rbl.go

@@ -300,7 +300,19 @@ func (r *DNSListChecker) reverseIP(ipStr string) string {
 
 // CalculateScore calculates the list contribution to deliverability.
 // Informational lists are not counted in the score.
-func (r *DNSListChecker) CalculateScore(results *DNSListResults) (int, string) {
+func (r *DNSListChecker) CalculateScore(results *DNSListResults, forWhitelist bool) (int, string) {
+	scoringListCount := len(r.Lists) - len(r.informationalSet)
+
+	if forWhitelist {
+		if results.ListedCount >= scoringListCount {
+			return 100, "A++"
+		} else if results.ListedCount > 0 {
+			return 100, "A+"
+		} else {
+			return 95, "A"
+		}
+	}
+
 	if results == nil || len(results.IPsChecked) == 0 {
 		return 100, ""
 	}
@@ -309,7 +321,6 @@ func (r *DNSListChecker) CalculateScore(results *DNSListResults) (int, string) {
 		return 100, "A+"
 	}
 
-	scoringListCount := len(r.Lists) - len(r.informationalSet)
 	percentage := 100 - results.RelevantListedCount*100/scoringListCount
 	return percentage, ScoreToGrade(percentage)
 }

pkg/analyzer/report.go

@@ -141,8 +141,10 @@ func (r *ReportGenerator) GenerateReport(testID uuid.UUID, results *AnalysisResu
 
 	blacklistScore := 0
 	var blacklistGrade string
+	var whitelistGrade string
 	if results.RBL != nil {
-		blacklistScore, blacklistGrade = r.rblChecker.CalculateScore(results.RBL)
+		blacklistScore, blacklistGrade = r.rblChecker.CalculateScore(results.RBL, false)
+		_, whitelistGrade = r.dnswlChecker.CalculateScore(results.DNSWL, true)
 	}
 
 	saScore, saGrade := r.spamAnalyzer.CalculateSpamAssassinScore(results.SpamAssassin)
@@ -173,7 +175,7 @@ func (r *ReportGenerator) GenerateReport(testID uuid.UUID, results *AnalysisResu
 		AuthenticationScore: authScore,
 		AuthenticationGrade: api.ScoreSummaryAuthenticationGrade(authGrade),
 		BlacklistScore:      blacklistScore,
-		BlacklistGrade:      api.ScoreSummaryBlacklistGrade(blacklistGrade),
+		BlacklistGrade:      api.ScoreSummaryBlacklistGrade(MinGrade(blacklistGrade, whitelistGrade)),
 		ContentScore:        contentScore,
 		ContentGrade:        api.ScoreSummaryContentGrade(contentGrade),
 		HeaderScore:         headerScore,

pkg/analyzer/scoring.go

@@ -73,6 +73,8 @@ func ScoreToReportGrade(score int) api.ReportGrade {
 // gradeRank returns a numeric rank for a grade (lower = worse)
 func gradeRank(grade string) int {
 	switch grade {
+	case "A++":
+		return 7
 	case "A+":
 		return 6
 	case "A":