Add factories to create a token as a string.

pom.xml

@@ -100,6 +100,17 @@
   </dependencyManagement>
 
   <dependencies>
+    <dependency>
+      <groupId>commons-codec</groupId>
+      <artifactId>commons-codec</artifactId>
+      <version>1.16.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-lang3</artifactId>
+      <version>3.13.0</version>
+    </dependency>
+
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-core</artifactId>

src/main/java/space/kklochko/spring_rest_example/security/tokens/SimpleRandomToken.java

@@ -0,0 +1,17 @@
+package space.kklochko.spring_rest_example.security.tokens;
+
+import org.apache.commons.lang3.RandomStringUtils;
+
+public class SimpleRandomToken extends StringTokenFactory {
+    public String create(String input) {
+        String salt = getRandomSalt(32);
+        return org.apache.commons.codec.digest.DigestUtils.sha256Hex(input + salt);
+    }
+
+    private String getRandomSalt(int length) {
+        boolean useLetters = true;
+        boolean useNumbers = true;
+        return RandomStringUtils.random(length, useLetters, useNumbers);
+    }
+}
+

src/main/java/space/kklochko/spring_rest_example/security/tokens/SimpleToken.java

@@ -0,0 +1,8 @@
+package space.kklochko.spring_rest_example.security.tokens;
+
+public class SimpleToken extends StringTokenFactory {
+    public String create(String input) {
+        return org.apache.commons.codec.digest.DigestUtils.sha256Hex(input);
+    }
+}
+

src/main/java/space/kklochko/spring_rest_example/security/tokens/StringTokenFactory.java

@@ -0,0 +1,6 @@
+package space.kklochko.spring_rest_example.security.tokens;
+
+abstract public class StringTokenFactory {
+    public abstract String create(String input);
+}
+

src/test/groovy/space/kklochko/spring_rest_example/security/tokens/SimpleRandomTokenSpec.groovy

@@ -0,0 +1,38 @@
+package space.kklochko.spring_rest_example.security.tokens
+
+import spock.lang.Specification
+import spock.lang.Subject
+
+class SimpleRandomTokenSpec extends Specification {
+    def "Create a token that based on sha256"() {
+        given: "I have a token factory"
+        @Subject
+        def factory = new SimpleRandomToken()
+
+        and: "I have a input data"
+        String input = "hello"
+
+        when: "I create a token"
+        String token = factory.create(input)
+
+        then: "The token is the same if the same input data."
+        token.length() == 64
+    }
+
+    def "Token must be different for the same input data"() {
+        given: "I have a token factory"
+        @Subject
+        def factory = new SimpleRandomToken()
+
+        and: "I have a input data"
+        String input = "hello"
+
+        when: "I create tokens"
+        String token = factory.create(input)
+        String token2 = factory.create(input)
+
+        then: "The tokens are different"
+        token != token2
+    }
+}
+

src/test/groovy/space/kklochko/spring_rest_example/security/tokens/SimpleTokenSpec.groovy

@@ -0,0 +1,24 @@
+package space.kklochko.spring_rest_example.security.tokens
+
+import spock.lang.Specification
+import spock.lang.Subject
+
+class SimpleTokenSpec extends Specification {
+    def "Create a token that based on sha256"() {
+        given: "I have a token factory"
+        @Subject
+        def factory = new SimpleToken()
+
+        when: "I create a token"
+        String token = factory.create(input)
+
+        then: "The token is the same if the same input data."
+        expectedToken == token
+
+        where: "I have the expected data"
+        input                  || expectedToken
+        "abc"                  || "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
+        "random numbers232341" || "7f4b80b2b09ae4326f78b1a9782c807af0a7d0194bffb05602a6585466b4c43e"
+    }
+}
+