From 1b9b6a3237cb09960196a508a1fec4d179180cf5 Mon Sep 17 00:00:00 2001
From: Banana <banana@starscream.de>
Date: Tue, 5 Jul 2022 12:48:30 +0200
Subject: [PATCH] future timestamp validator for magnolia

---
 .../validator/FutureTimestampDefinition.java  | 33 ++++++++++++
 .../validator/FutureTimestampFactory.java     | 26 +++++++++
 .../validator/FutureTimestampValidator.java   | 54 +++++++++++++++++++
 3 files changed, 113 insertions(+)
 create mode 100644 magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampDefinition.java
 create mode 100644 magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampFactory.java
 create mode 100644 magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampValidator.java

diff --git a/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampDefinition.java b/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampDefinition.java
new file mode 100644
index 0000000..1a61428
--- /dev/null
+++ b/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampDefinition.java
@@ -0,0 +1,33 @@
+package net.bananasplayground.validator;
+
+import info.magnolia.ui.field.ConfiguredFieldValidatorDefinition;
+import info.magnolia.ui.field.ValidatorType;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Checks if datetime selection is >= now+timeToAdd
+ *
+ * works on LocalDateTime object
+ *
+ * timeToAdd time in lowercase, date uppercase
+ * timeToAdd: 1h|2D
+ *
+ * futureDate:
+ *  $type: futureTimestamp
+ *  timeToAdd: 1h
+ *  errorMessage: bla
+ *
+ */
+
+@Getter
+@Setter
+@ValidatorType("futureTimestamp")
+public class FutureTimestampDefinition extends ConfiguredFieldValidatorDefinition {
+
+    private String timeToAdd;
+
+    public FutureTimestampDefinition() {
+        setFactoryClass(FutureTimestampFactory.class);
+    }
+}
diff --git a/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampFactory.java b/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampFactory.java
new file mode 100644
index 0000000..77f1b3b
--- /dev/null
+++ b/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampFactory.java
@@ -0,0 +1,26 @@
+package net.bananasplayground.validator;
+
+import java.time.LocalDateTime;
+
+import javax.inject.Inject;
+
+import com.vaadin.data.Validator;
+
+import info.magnolia.ui.field.AbstractFieldValidatorFactory;
+
+/**
+ * @see net.bananasplayground.validator.FutureTimestampDefinition
+ */
+
+public class FutureTimestampFactory extends AbstractFieldValidatorFactory<FutureTimestampDefinition, LocalDateTime> {
+
+    @Inject
+    public FutureTimestampFactory(FutureTimestampDefinition definition) {
+        super(definition);
+    }
+
+    @Override
+    public Validator<LocalDateTime> createValidator() {
+        return new FutureTimestampValidator(getI18nErrorMessage(), definition.getTimeToAdd());
+    }
+}
diff --git a/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampValidator.java b/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampValidator.java
new file mode 100644
index 0000000..667efdc
--- /dev/null
+++ b/magnolia/futureTimestampValidator/net/bananasplayground/validator/FutureTimestampValidator.java
@@ -0,0 +1,54 @@
+package net.bananasplayground.validator;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.time.Period;
+import java.time.temporal.TemporalAmount;
+
+import org.apache.commons.lang3.StringUtils;
+
+import com.vaadin.data.ValidationResult;
+import com.vaadin.data.ValueContext;
+import com.vaadin.data.validator.AbstractValidator;
+
+/**
+ * @see net.bananasplayground.validator.FutureTimestampDefinition
+ */
+
+public class FutureTimestampValidator extends AbstractValidator<LocalDateTime> {
+
+    private final String errorMessage;
+    private final String timeToAdd;
+
+    protected FutureTimestampValidator(String errorMessage, String timeToAdd) {
+        super(errorMessage);
+        this.errorMessage = errorMessage;
+        this.timeToAdd = timeToAdd;
+    }
+
+    @Override
+    public ValidationResult apply(LocalDateTime value, ValueContext context) {
+        if(StringUtils.isBlank(timeToAdd)) return ValidationResult.ok();
+        boolean isValid = false;
+
+        // date-based units (year, month, week, day) are denoted with uppercase abbreviations
+        // (Y, M, W and D) while the time-based ones (hour and minute) are lowercase (h and m).
+        // Test the case of the last character of the string to decide whether to parse into
+        // a Period or a Duration. I exploit the fact that both of Period.parse and Duration.parse
+        // accept the letters in either case.
+        TemporalAmount toAddToCurrentDateTime;
+        if (Character.isUpperCase(timeToAdd.charAt(timeToAdd.length() - 1))) {
+            toAddToCurrentDateTime = Period.parse("P" + timeToAdd);
+        } else {
+            toAddToCurrentDateTime = Duration.parse("PT" + timeToAdd);
+        }
+
+        LocalDateTime now = LocalDateTime.now();
+        LocalDateTime futureDateTime = now.plus(toAddToCurrentDateTime);
+        if(value.isEqual(futureDateTime) || value.isAfter(futureDateTime)) {
+            isValid = true;
+        }
+
+        return isValid ? ValidationResult.ok() : ValidationResult.error(this.errorMessage);
+    }
+}
-- 
2.39.5