Added a minimal test for FormBodyWrapperFilter handling multiple part names with multiple parts

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/zuul/filters/pre/FormBodyWrapperFilterTests.java

+package org.springframework.cloud.netflix.zuul.filters.pre;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.Part;
+
+import org.apache.commons.io.IOUtils;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.mock.web.MockMultipartHttpServletRequest;
+
+import com.netflix.zuul.context.RequestContext;
+
+/**
+ * @author Michael Hartle
+ */
+public class FormBodyWrapperFilterTests {
+	
+	private FormBodyWrapperFilter filter;
+	
+	private MockMultipartHttpServletRequest request = new MockMultipartHttpServletRequest();
+
+	@Before
+	public void init() {
+		this.filter = new FormBodyWrapperFilter();
+		RequestContext ctx = RequestContext.getCurrentContext();
+		ctx.clear();
+		ctx.setRequest(this.request);
+	}
+	
+	@Test
+	public void multiplePartNamesWithMultipleParts() throws IOException, ServletException {
+		this.request.setRequestURI("/api/foo/1");
+		this.request.setRemoteAddr("5.6.7.8");
+		
+		final Map<String, List<String>> firstPartHeaders = new HashMap<>();
+		final byte[] firstPartBody = "{ \"u\" : 1 }".getBytes();
+		final Part firstPart = new MockPart("a", "application/json", null, firstPartHeaders, firstPartBody);
+		this.request.addPart(firstPart);
+
+		final Map<String, List<String>> secondPartHeaders = new HashMap<>();
+		final byte[] secondPartBody = "%PDF...1".getBytes();
+		final Part secondPart = new MockPart("b", "application/pdf", "document.pdf", secondPartHeaders, secondPartBody);
+		this.request.addPart(secondPart);
+		
+		final Map<String, List<String>> thirdPartHeaders = new HashMap<>();
+		final byte[] thirdPartBody = "%PDF...2".getBytes();
+		final Part thirdPart = new MockPart("c", "application/pdf", "attachment1.pdf", thirdPartHeaders, thirdPartBody);
+		this.request.addPart(thirdPart);
+		
+		final Map<String, List<String>> fourthPartHeaders = new HashMap<>();
+		final byte[] fourthPartBody = "%PDF...3".getBytes();
+		final Part fourthPart = new MockPart("c", "application/pdf", "attachment2.pdf", fourthPartHeaders, fourthPartBody);
+		this.request.addPart(fourthPart);
+
+		final Map<String, List<String>> fifthPartHeaders = new HashMap<>();
+		final byte[] fifthPartBody = "%PDF...4".getBytes();
+		final Part fifthPart = new MockPart("c", "application/pdf", "attachment3.pdf", fifthPartHeaders, fifthPartBody);
+		this.request.addPart(fifthPart);
+		
+		this.filter.run();
+		
+		final RequestContext ctx = RequestContext.getCurrentContext();
+		assertEquals("/api/foo/1", ctx.getRequest().getRequestURI());
+		assertEquals("5.6.7.8", ctx.getRequest().getRemoteAddr());
+		assertEquals(5, ctx.getRequest().getParts().size());
+		
+		final Part[] parts = ctx.getRequest().getParts().toArray(new Part[0]);
+		assertEquals("a", parts[0].getName());
+		assertEquals(null, parts[0].getSubmittedFileName());
+		assertEquals("application/json", parts[0].getContentType());
+		assertArrayEquals(firstPartBody, IOUtils.toByteArray(parts[0].getInputStream()));
+		
+		assertEquals("b", parts[1].getName());
+		assertEquals("document.pdf", parts[1].getSubmittedFileName());
+		assertEquals("application/pdf", parts[1].getContentType());
+		assertArrayEquals(secondPartBody, IOUtils.toByteArray(parts[1].getInputStream()));
+		
+		assertEquals("c", parts[2].getName());
+		assertEquals("attachment1.pdf", parts[2].getSubmittedFileName());
+		assertEquals("application/pdf", parts[2].getContentType());
+		assertArrayEquals(thirdPartBody, IOUtils.toByteArray(parts[2].getInputStream()));
+		
+		assertEquals("c", parts[3].getName());
+		assertEquals("attachment2.pdf", parts[3].getSubmittedFileName());
+		assertEquals("application/pdf", parts[3].getContentType());
+		assertArrayEquals(fourthPartBody, IOUtils.toByteArray(parts[3].getInputStream()));
+
+		assertEquals("c", parts[4].getName());
+		assertEquals("attachment3.pdf", parts[4].getSubmittedFileName());
+		assertEquals("application/pdf", parts[4].getContentType());
+		assertArrayEquals(fifthPartBody, IOUtils.toByteArray(parts[4].getInputStream()));
+	}
+	
+	private class MockPart implements Part {
+		private final String name;
+		private final String contentType;
+		private final String submittedFileName;
+		private final Map<String, List<String>> headers;
+		private final byte[] body;
+		
+		public MockPart(final String name, final String contentType, final String submittedFileName, final Map<String, List<String>> headers, final byte[] body) {
+			this.name = name;
+			this.contentType = contentType;
+			this.submittedFileName = submittedFileName;
+			this.headers = headers;
+			this.body = body;
+		}
+
+		@Override
+		public InputStream getInputStream() throws IOException {
+			return new ByteArrayInputStream(this.body);
+		}
+
+		@Override
+		public String getContentType() {
+			return this.contentType;
+		}
+
+		@Override
+		public String getName() {
+			return this.name;
+		}
+
+		@Override
+		public String getSubmittedFileName() {
+			return this.submittedFileName;
+		}
+
+		@Override
+		public long getSize() {
+			return this.body != null ? this.body.length : 0;
+		}
+
+		@Override
+		public void write(String fileName) throws IOException {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void delete() throws IOException {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public String getHeader(String name) {
+			if (this.headers == null) {
+				return null;
+			}
+
+			final List<String> values = this.headers.get(name);
+
+			if (values == null || values.size() == 0) {
+				return null;
+			}
+			
+			return values.get(0);
+		}
+
+		@Override
+		public Collection<String> getHeaders(String name) {
+			if (this.headers == null) {
+				return null;
+			}
+			
+			return this.headers.get(name);
+		}
+
+		@Override
+		public Collection<String> getHeaderNames() {
+			if (this.headers == null) {
+				return null;
+			}
+
+			return this.headers.keySet();
+		}
+	}
+}