turcsanyip commented on a change in pull request #4843:
URL: https://github.com/apache/nifi/pull/4843#discussion_r585093947



##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/services/azure/storage/ADLSCredentialsControllerService.java
##########
@@ -93,20 +137,41 @@
     protected Collection<ValidationResult> customValidate(ValidationContext 
validationContext) {
         final List<ValidationResult> results = new ArrayList<>();
 
-        boolean accountKeySet = 
StringUtils.isNotBlank(validationContext.getProperty(AzureStorageUtils.ACCOUNT_KEY).getValue());
-        boolean sasTokenSet = 
StringUtils.isNotBlank(validationContext.getProperty(AzureStorageUtils.PROP_SAS_TOKEN).getValue());
+        boolean accountKeySet = 
StringUtils.isNotBlank(validationContext.getProperty(ACCOUNT_KEY).getValue());
+        boolean sasTokenSet = 
StringUtils.isNotBlank(validationContext.getProperty(SAS_TOKEN).getValue());
         boolean useManagedIdentitySet = 
validationContext.getProperty(USE_MANAGED_IDENTITY).asBoolean();
 
-        if (!onlyOneSet(accountKeySet, sasTokenSet, useManagedIdentitySet)) {
-            StringJoiner options = new StringJoiner(", ")
-                .add(AzureStorageUtils.ACCOUNT_KEY.getDisplayName())
-                .add(AzureStorageUtils.PROP_SAS_TOKEN.getDisplayName())
-                .add(USE_MANAGED_IDENTITY.getDisplayName());
+        boolean servicePrincipalTenantIdSet = 
StringUtils.isNotBlank(validationContext.getProperty(SERVICE_PRINCIPAL_TENANT_ID).getValue());
+        boolean servicePrincipalClientIdSet = 
StringUtils.isNotBlank(validationContext.getProperty(SERVICE_PRINCIPAL_CLIENT_ID).getValue());
+        boolean servicePrincipalClientSecretSet = 
StringUtils.isNotBlank(validationContext.getProperty(SERVICE_PRINCIPAL_CLIENT_SECRET).getValue());
 
+        boolean servicePrincipalSet = servicePrincipalTenantIdSet || 
servicePrincipalClientIdSet || servicePrincipalClientSecretSet;
+
+        if (!onlyOneSet(accountKeySet, sasTokenSet, useManagedIdentitySet, 
servicePrincipalSet)) {
             results.add(new 
ValidationResult.Builder().subject(this.getClass().getSimpleName())
                 .valid(false)
-                .explanation("one and only one of [" + options + "] should be 
set")
+                .explanation("one and only one authentication method of 
[Account Key, SAS Token, Managed Identity, Service Principal] should be used")
                 .build());
+        } else if (servicePrincipalSet) {
+            String template = "'%s' must be set when Service Principal 
authentication is being configured";

Review comment:
       Just for this, I would not add a new commit. Will fix it in the 
follow-up jira (where `customValidate()` will be modified).




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