Added encode/decode convenience methods for content (#240).

src/main/java/org/gitlab4j/api/models/RepositoryFile.java

 
 package org.gitlab4j.api.models;
 
+import java.util.Base64;
+
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlRootElement;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
 @XmlRootElement
 @XmlAccessorType(XmlAccessType.FIELD)
 public class RepositoryFile {
@@ -90,4 +94,73 @@ public class RepositoryFile {
     public void setLastCommitId(String lastCommitId) {
         this.lastCommitId = lastCommitId;
     }
+
+    /**
+     * Returns the content as a String, base64 decoding it if necessary.
+     * For binary files it is recommended to use getDecodedContentAsBytes() 
+     *
+     * @return the content as a String, base64 decoding it if necessary
+     */
+    @JsonIgnore
+    public String getDecodedContentAsString() {
+
+        if (content == null) {
+            return (null);
+        }
+
+        if ("base64".equalsIgnoreCase(encoding)) {
+            return (new String(Base64.getDecoder().decode(content)));
+        }
+
+        return (content);
+    }
+
+    /**
+     * Returns the content as a byte array, decoding from base64 if necessary.
+     * For String content it is recommended to use getDecodedContent().
+     *
+     * @return the content as a byte array, decoding from base64 if necessary
+     */
+    @JsonIgnore
+    public byte[] getDecodedContentAsBytes() {
+
+        if (content == null) {
+            return (null);
+        }
+
+        if ("base64".equalsIgnoreCase(encoding)) {
+            return (Base64.getDecoder().decode(content));
+        }
+
+        return (content.getBytes());
+    }
+
+    /**
+     * Encodes the provided String using Base64 and sets it as the content. The encoding
+     * property of this instance will be set to base64.
+     *
+     * @param content the String content to encode and set as the base64 encoded String content
+     */
+    @JsonIgnore
+    public void encodeAndSetContent(String content) {
+        encodeAndSetContent(content != null ? content.getBytes() : null);
+    }
+
+    /**
+     * Encodes the provided byte array using Base64 and sets it as the content. The encoding
+     * property of this instance will be set to base64.
+     *
+     * @param content the byte[] content to encode and set as the base64 encoded String content
+     */
+    @JsonIgnore
+    public void encodeAndSetContent(byte[] byteContent) {
+
+        if (byteContent == null) {
+            byteContent = null;
+            return;
+        }
+
+        this.content = Base64.getEncoder().encodeToString(byteContent);
+        encoding = "base64";
+    }
 }

src/test/java/org/gitlab4j/api/TestRepositoryFileApi.java

@@ -44,7 +44,6 @@ public class TestRepositoryFileApi {
     private static final String TEST_NAMESPACE;
     private static final String TEST_HOST_URL;
     private static final String TEST_PRIVATE_TOKEN;
-
     static {
         TEST_NAMESPACE = TestUtils.getProperty("TEST_NAMESPACE");
         TEST_PROJECT_NAME = TestUtils.getProperty("TEST_PROJECT_NAME");
@@ -52,6 +51,9 @@ public class TestRepositoryFileApi {
         TEST_PRIVATE_TOKEN = TestUtils.getProperty("TEST_PRIVATE_TOKEN");
     }
 
+    private static final String TEST_CONTENT = "This is some content to test file content 1234567890 !@#$%^&().";
+    private static final String TEST_ADDITIONAL_CONTENT = "\n\nThis is an additional line";
+
     private static final String TEST_BRANCH_NAME = "feature/test_branch_for_files";
     private static final String TEST_FILEPATH = "test-file.txt";
     private static GitLabApi gitLabApi;
@@ -183,7 +185,7 @@ public class TestRepositoryFileApi {
 
         RepositoryFile file = new RepositoryFile();
         file.setFilePath(TEST_FILEPATH);
-        file.setContent("This is a test file.");
+        file.setContent(TEST_CONTENT);
         RepositoryFile createdFile = gitLabApi.getRepositoryFileApi().createFile(file, project.getId(), TEST_BRANCH_NAME, "Testing createFile().");
         assertNotNull(createdFile);
 
@@ -209,4 +211,39 @@ public class TestRepositoryFileApi {
         gitLabApi.getRepositoryFileApi().deleteFile(TEST_FILEPATH, project.getId(), TEST_BRANCH_NAME, "Testing deleteFile().");
         gitLabApi.getRepositoryApi().deleteBranch(project.getId(), TEST_BRANCH_NAME);
     }
+
+    @Test
+    public void testUpdateFile() throws GitLabApiException {
+
+        Project project = gitLabApi.getProjectApi().getProject(TEST_NAMESPACE, TEST_PROJECT_NAME);
+        assertNotNull(project);
+
+        Branch branch = gitLabApi.getRepositoryApi().createBranch(project.getId(), TEST_BRANCH_NAME, "master");
+        assertNotNull(branch);
+
+        RepositoryFile file = new RepositoryFile();
+        file.setFilePath(TEST_FILEPATH);
+        file.setContent(TEST_CONTENT);
+        RepositoryFile createdFile = gitLabApi.getRepositoryFileApi().createFile(file, project.getId(), TEST_BRANCH_NAME, "Testing createFile().");
+        assertNotNull(createdFile);
+
+        Optional<RepositoryFile> optionalFile = gitLabApi.getRepositoryFileApi().getOptionalFile(project, TEST_FILEPATH, TEST_BRANCH_NAME);
+        assertTrue(optionalFile.isPresent());
+        RepositoryFile newFile = optionalFile.get();
+        assertEquals(TEST_CONTENT, newFile.getDecodedContentAsString());
+
+        String newContent = TEST_CONTENT + TEST_ADDITIONAL_CONTENT;
+        file = new RepositoryFile();
+        file.setFilePath(TEST_FILEPATH);
+        file.encodeAndSetContent(newContent);
+        gitLabApi.getRepositoryFileApi().updateFile(file, project.getId(), TEST_BRANCH_NAME, "Testing updateFile().");
+
+        optionalFile = gitLabApi.getRepositoryFileApi().getOptionalFile(project, TEST_FILEPATH, TEST_BRANCH_NAME);
+        assertTrue(optionalFile.isPresent());
+        RepositoryFile updatedFile = optionalFile.get();
+        assertEquals(newContent, updatedFile.getDecodedContentAsString());
+
+        gitLabApi.getRepositoryFileApi().deleteFile(TEST_FILEPATH, project.getId(), TEST_BRANCH_NAME, "Testing deleteFile().");
+        gitLabApi.getRepositoryApi().deleteBranch(project.getId(), TEST_BRANCH_NAME);
+    }
 }