block and blockchain are ready

.idea/compiler.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="blueCoin" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>

.idea/encodings.xml

@@ -0,0 +1,6 @@
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+<project version="4">
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.idea/misc.xml

@@ -0,0 +1,14 @@
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.idea/uiDesigner.xml

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.idea/vcs.xml

@@ -0,0 +1,6 @@
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.idea/workspace.xml

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+      <state key="FacetStructureConfigurable.UI">
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+      <state key="ModuleStructureConfigurable.UI">
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+          <splitter-proportions>
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+                <option value="0.2" />
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+      </state>
+    </states>
+  </component>
+</project>

pom.xml

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>io.zipcoder</groupId>
+    <artifactId>blueCoin</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>1.5.3.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <start-class>io.zipcoder.blue_coin_application.BlueCoinApplication</start-class>
+        <java.version>1.7</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hsqldb</groupId>
+            <artifactId>hsqldb</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.bluecatcode.guava</groupId>
+            <artifactId>guava-19.0-extended</artifactId>
+            <version>LATEST</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.inject</groupId>
+            <artifactId>javax.inject</artifactId>
+            <version>1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+        </dependency>
+    </dependencies>
+
+
+</project>

src/main/java/io/zipcoder/blue_coin_application/BlueCoinApplication.java

@@ -0,0 +1,4 @@
+package io.zipcoder.blue_coin_application;
+
+public class BlueCoinApplication {
+}

src/main/java/io/zipcoder/blue_coin_application/model/Block.java

@@ -0,0 +1,39 @@
+package io.zipcoder.blue_coin_application.model;
+
+import io.zipcoder.blue_coin_application.utility.Encryption;
+
+import java.util.Date;
+
+public class Block {
+    private String hash;
+    private String previousHash;
+    private String data;
+    private long timeStamp;
+
+    public Block(String data, String previousHash) {
+        this.data = data;
+        this.previousHash = previousHash;
+        this.timeStamp = new Date().getTime();
+        this.hash = calculateHash();
+    }
+
+    public String getHash() {
+        return hash;
+    }
+
+    public String getPreviousHash() {
+        return previousHash;
+    }
+
+    public String getData() {
+        return data;
+    }
+
+    public long getTimeStamp() {
+        return timeStamp;
+    }
+
+    public String calculateHash() {
+        return Encryption.applySha256(previousHash + Long.toString(timeStamp) + data);
+    }
+}

src/main/java/io/zipcoder/blue_coin_application/model/Blockchain.java

@@ -0,0 +1,49 @@
+package io.zipcoder.blue_coin_application.model;
+
+import com.google.gson.GsonBuilder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Blockchain {
+    private static List<Block> blockchain = new ArrayList<>();
+
+    public String chainToJson() {
+        return new GsonBuilder()
+                .setPrettyPrinting()
+                .create()
+                .toJson(blockchain);
+    }
+
+    public static List<Block> getBlockchain() {
+        return blockchain;
+    }
+
+    public static void abbBlockToChain(Block block) {
+        blockchain.add(block);
+    }
+
+    public static Block getBlockFromChain(int i) {
+        return blockchain.get(i);
+    }
+
+    public static int getChainSize() {
+        return blockchain.size();
+    }
+
+    public static boolean isChainValid() {
+        Block currentBlock;
+        Block previousBlock;
+        for (int i = 1; i < blockchain.size()-1; i++) {
+            currentBlock = blockchain.get(i);
+            previousBlock = blockchain.get(i-1);
+            if(!currentBlock.getHash().equals(currentBlock.calculateHash())) {
+                return false;
+            }
+            if(!previousBlock.getHash().equals(currentBlock.getPreviousHash())) {
+                return false;
+            }
+        }
+        return true;
+    }
+}

src/main/java/io/zipcoder/blue_coin_application/utility/Encryption.java

@@ -0,0 +1,13 @@
+package io.zipcoder.blue_coin_application.utility;
+
+import com.google.common.hash.Hashing;
+
+import java.nio.charset.StandardCharsets;
+
+public class Encryption {
+    public static String applySha256(String input) {
+        return Hashing.sha256()
+                .hashString(input, StandardCharsets.UTF_8)
+                .toString();
+    }
+}

src/test/java/io/zipcoder/blue_coin_application/TestBlock.java

@@ -0,0 +1,22 @@
+package io.zipcoder.blue_coin_application;
+
+import io.zipcoder.blue_coin_application.model.Block;
+import org.junit.*;
+
+public class TestBlock {
+
+    @Test
+    public void testCalculateHash() {
+        Block block = new Block("data to encrypt", "dsgvcv4a534ghfgcvvw45ttb");
+        int actual = block.calculateHash().length();
+        Assert.assertEquals(64, actual);
+    }
+
+    @Test
+    public void testGetHash() {
+        Block block = new Block("more data to encrypt", "esfvdghfw546w5rtsw465gvfd");
+        String expected = block.calculateHash();
+        String actual = block.getHash();
+        Assert.assertEquals(expected, actual);
+    }
+}

src/test/java/io/zipcoder/blue_coin_application/TestBlockchain.java

@@ -0,0 +1,31 @@
+package io.zipcoder.blue_coin_application;
+
+import io.zipcoder.blue_coin_application.model.Block;
+import io.zipcoder.blue_coin_application.model.Blockchain;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class TestBlockchain {
+
+    @Before
+    public void initialize() {
+        Blockchain.abbBlockToChain(new Block("any data to add to block goes here", "0"));
+        Blockchain.abbBlockToChain(new Block("probably transactions in our case", (Blockchain.getBlockFromChain(Blockchain.getChainSize()-1)).getHash()));
+        Blockchain.abbBlockToChain(new Block("are you looking at my test, Mexi?", (Blockchain.getBlockFromChain(Blockchain.getChainSize()-1)).getHash()));
+    }
+
+    @Test
+    public void testAddBlockToChain() {
+        int expected = 3;
+        int actual = Blockchain.getChainSize();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testIsChainValid() {
+        boolean actual = Blockchain.isChainValid();
+        Assert.assertTrue(actual);
+    }
+
+}