src/main/kotlin/fr/dcproject/common/validation/Password.kt

@@ -0,0 +1,22 @@
+package fr.dcproject.common.validation
+
+import io.konform.validation.ValidationBuilder
+
+fun ValidationBuilder<String>.passwordScore(minScore: Int) =
+    addConstraint("is not enough strong. Use Upper case, Lower case and special characters or juste use more characters.") { value ->
+        value.passwordScore() >= minScore
+    }
+
+fun String.passwordScore(): Int {
+    var score: Int = length
+    val alphaNum = ('a'..'z').toList() + ('A'..'Z').toList() + ('0'..'9').toList()
+    val specialCount = (length - toList().intersect(alphaNum).size)
+    score += specialCount.let { if (it > 3) 3 else it }
+
+    val hasAlphaLower = toList().intersect(('a'..'z').toList()).size.let { if (it > 2) 2 else it }
+    val hasAlphaUpper = toList().intersect(('A'..'Z').toList()).size.let { if (it > 2) 2 else it }
+    val hasNum = toList().intersect(('0'..'9').toList()).size.let { if (it > 2) 2 else it }
+    score += (hasAlphaLower + hasAlphaUpper + hasNum - 2) * 2
+
+    return score
+}

src/test/kotlin/unit/Password Validation.kt

@@ -0,0 +1,45 @@
+package unit
+
+import fr.dcproject.common.validation.passwordScore
+import io.konform.validation.Invalid
+import io.konform.validation.Valid
+import io.konform.validation.Validation
+import org.amshove.kluent.`should be equal to`
+import org.amshove.kluent.`should be instance of`
+import org.junit.jupiter.api.Tag
+import org.junit.jupiter.api.Tags
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.api.parallel.Execution
+import org.junit.jupiter.api.parallel.ExecutionMode
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+@Execution(ExecutionMode.CONCURRENT)
+@Tags(Tag("validation"), Tag("unit"))
+internal class `Password Validation` {
+    @Test
+    fun password() {
+        "1234567890".passwordScore() `should be equal to` 10
+        "1234567A".passwordScore() `should be equal to` 10
+        "1234Aa".passwordScore() `should be equal to` 10
+        "12Aab".passwordScore() `should be equal to` 11
+        "1234Aa".passwordScore() `should be equal to` 10
+        "12abCD-+".passwordScore() `should be equal to` 18
+        "Abcde12!".passwordScore() `should be equal to` 15
+        "Hello world".passwordScore() `should be equal to` 16
+    }
+
+    @Test
+    fun passwordScore() {
+        Validation<ObjectToValid> {
+            ObjectToValid::password {
+                this.passwordScore(10)
+            }
+        }.run {
+            validate(ObjectToValid("1234567890")) `should be instance of` Valid::class
+            validate(ObjectToValid("12345678")) `should be instance of` Invalid::class
+        }
+    }
+
+    class ObjectToValid(val password: String)
+}