Mods to support file upload (#171).

pom.xml

@@ -227,6 +227,12 @@
 			<artifactId>jersey-apache-connector</artifactId>
 			<version>${jersey.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>org.glassfish.jersey.media</groupId>
+			<artifactId>jersey-media-multipart</artifactId>
+			<version>${jersey.version}</version>
+		</dependency>
+
 		<dependency>
 			<groupId>javax.servlet</groupId>
 			<artifactId>javax.servlet-api</artifactId>

src/main/java/org/gitlab4j/api/AbstractApi.java

 package org.gitlab4j.api;
 
+import java.io.File;
 import java.net.URL;
 import java.net.URLEncoder;
 
@@ -147,7 +148,7 @@ public abstract class AbstractApi implements Constants {
      * a ClientResponse instance with the data returned from the endpoint.
      *
      * @param expectedStatus the HTTP status that should be returned from the server
-     * @param stream the StreamingOutput taht will be used for the POST data
+     * @param stream the StreamingOutput that will be used for the POST data
      * @param mediaType the content-type for the streamed data
      * @param pathArgs variable list of arguments used to build the URI
      * @return a ClientResponse instance with the data returned from the endpoint
@@ -197,6 +198,46 @@ public abstract class AbstractApi implements Constants {
         }
     }
 
+    /**
+     * Perform a file upload with the specified File instance and path objects, returning
+     * a ClientResponse instance with the data returned from the endpoint.
+     *
+     * @param expectedStatus the HTTP status that should be returned from the server
+     * @param name the name for the form field that contains the file name
+     * @param fileToUpload a File instance pointing to the file to upload
+     * @param mediaType the content-type of the uploaded file, if null will be determined from fileToUpload
+     * @param pathArgs variable list of arguments used to build the URI
+     * @return a ClientResponse instance with the data returned from the endpoint
+     * @throws GitLabApiException if any exception occurs during execution
+     */
+    protected Response upload(Response.Status expectedStatus, String name, File fileToUpload, String mediaType, Object... pathArgs) throws GitLabApiException {
+        try {
+            return validate(getApiClient().upload(name, fileToUpload, mediaType, pathArgs), expectedStatus);
+        } catch (Exception e) {
+            throw handle(e);
+        }
+    }
+
+    /**
+     * Perform a file upload with the specified File instance and path objects, returning
+     * a ClientResponse instance with the data returned from the endpoint.
+     *
+     * @param expectedStatus the HTTP status that should be returned from the server
+     * @param name the name for the form field that contains the file name
+     * @param fileToUpload a File instance pointing to the file to upload
+     * @param mediaType the content-type of the uploaded file, if null will be determined from fileToUpload
+     * @param url the fully formed path to the GitLab API endpoint
+     * @return a ClientResponse instance with the data returned from the endpoint
+     * @throws GitLabApiException if any exception occurs during execution
+     */
+    protected Response upload(Response.Status expectedStatus, String name, File fileToUpload, String mediaType, URL url) throws GitLabApiException {
+        try {
+            return validate(getApiClient().upload(name, fileToUpload, mediaType, url), expectedStatus);
+        } catch (Exception e) {
+            throw handle(e);
+        }
+    }
+
     /**
      * Perform an HTTP PUT call with the specified form data and path objects, returning
      * a ClientResponse instance with the data returned from the endpoint.

src/main/java/org/gitlab4j/api/GitLabApiClient.java

 package org.gitlab4j.api;
 
+import static javax.ws.rs.core.MediaType.MULTIPART_FORM_DATA_TYPE;
+
+import java.io.File;
 import java.io.IOException;
 import java.net.Socket;
 import java.net.URL;
@@ -33,6 +36,11 @@ import org.gitlab4j.api.utils.JacksonJson;
 import org.glassfish.jersey.apache.connector.ApacheConnectorProvider;
 import org.glassfish.jersey.client.ClientConfig;
 import org.glassfish.jersey.client.ClientProperties;
+import org.glassfish.jersey.media.multipart.FormDataMultiPart;
+import org.glassfish.jersey.media.multipart.MultiPart;
+import org.glassfish.jersey.media.multipart.MultiPartFeature;
+import org.glassfish.jersey.media.multipart.file.FileDataBodyPart;
+
 
 /**
  * This class utilizes the Jersey client package to communicate with a GitLab API endpoint.
@@ -224,6 +232,7 @@ public class GitLabApiClient {
         }
 
         clientConfig.register(JacksonJson.class);
+        clientConfig.register(MultiPartFeature.class);
     }
 
     /**
@@ -450,6 +459,45 @@ public class GitLabApiClient {
         return (invocation(url, null).post(Entity.entity(stream, mediaType)));
     }
 
+    /**
+     * Perform a file upload as part of the , returning
+     * a ClientResponse instance with the data returned from the endpoint.
+     *
+     * @param name the name for the form field that contains the file name
+     * @param fileToUpload a File instance pointing to the file to upload
+     * @param mediaTypeString the content-type of the uploaded file, if null will be determined from fileToUpload
+     * @param pathArgs variable list of arguments used to build the URI
+     * @return a ClientResponse instance with the data returned from the endpoint
+     * @throws IOException if an error occurs while constructing the URL
+     */
+    protected Response upload(String name, File fileToUpload, String mediaTypeString, Object... pathArgs) throws IOException {
+        URL url = getApiUrl(pathArgs);
+        return (upload(name, fileToUpload, mediaTypeString, url));
+    }
+
+    /**
+     * Perform a file upload using multipart/form-data, returning
+     * a ClientResponse instance with the data returned from the endpoint.
+     *
+     * @param name the name for the form field that contains the file name
+     * @param fileToUpload a File instance pointing to the file to upload
+     * @param mediaTypeString the content-type of the uploaded file, if null will be determined from fileToUpload
+     * @param url the fully formed path to the GitLab API endpoint
+     * @return a ClientResponse instance with the data returned from the endpoint
+     * @throws IOException if an error occurs while constructing the URL
+     */
+    protected Response upload(String name, File fileToUpload, String mediaTypeString, URL url) throws IOException {
+
+        MediaType mediaType = (mediaTypeString != null ? MediaType.valueOf(mediaTypeString) : null);
+        try (MultiPart multiPart = new FormDataMultiPart()) {
+            FileDataBodyPart filePart = mediaType != null ?
+                new FileDataBodyPart(name, fileToUpload, mediaType) :
+                new FileDataBodyPart(name, fileToUpload);
+            multiPart.bodyPart(filePart);
+            return (invocation(url, null).post(Entity.entity(multiPart, MULTIPART_FORM_DATA_TYPE)));
+        }
+    }
+
     /**
      * Perform an HTTP PUT call with the specified form data and path objects, returning
      * a ClientResponse instance with the data returned from the endpoint.