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backend/internal/config/config_validation.go

@@ -0,0 +1,79 @@
+package config
+
+import (
+	"bytes"
+	"encoding/json"
+
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/crypto/bcrypt"
+)
+
+// SanitizePayloadRules validates raw JSON payload rule params and drops invalid rules.
+func (cfg *Config) SanitizePayloadRules() {
+	if cfg == nil {
+		return
+	}
+	cfg.Payload.DefaultRaw = sanitizePayloadRawRules(cfg.Payload.DefaultRaw, "default-raw")
+	cfg.Payload.OverrideRaw = sanitizePayloadRawRules(cfg.Payload.OverrideRaw, "override-raw")
+}
+
+func sanitizePayloadRawRules(rules []PayloadRule, section string) []PayloadRule {
+	if len(rules) == 0 {
+		return rules
+	}
+	out := make([]PayloadRule, 0, len(rules))
+	for i := range rules {
+		rule := rules[i]
+		if len(rule.Params) == 0 {
+			continue
+		}
+		invalid := false
+		for path, value := range rule.Params {
+			raw, ok := payloadRawString(value)
+			if !ok {
+				continue
+			}
+			trimmed := bytes.TrimSpace(raw)
+			if len(trimmed) == 0 || !json.Valid(trimmed) {
+				log.WithFields(log.Fields{
+					"section":    section,
+					"rule_index": i + 1,
+					"param":      path,
+				}).Warn("payload rule dropped: invalid raw JSON")
+				invalid = true
+				break
+			}
+		}
+		if invalid {
+			continue
+		}
+		out = append(out, rule)
+	}
+	return out
+}
+
+func payloadRawString(value any) ([]byte, bool) {
+	switch typed := value.(type) {
+	case string:
+		return []byte(typed), true
+	case []byte:
+		return typed, true
+	default:
+		return nil, false
+	}
+}
+
+// looksLikeBcrypt returns true if the provided string appears to be a bcrypt hash.
+func looksLikeBcrypt(s string) bool {
+	return len(s) > 4 && (s[:4] == "$2a$" || s[:4] == "$2b$" || s[:4] == "$2y$")
+}
+
+// hashSecret hashes the given secret using bcrypt.
+func hashSecret(secret string) (string, error) {
+	// Use default cost for simplicity.
+	hashedBytes, err := bcrypt.GenerateFromPassword([]byte(secret), bcrypt.DefaultCost)
+	if err != nil {
+		return "", err
+	}
+	return string(hashedBytes), nil
+}