Honour Content-Type charset whenever content is turned into a String

This commit builds on the changes made in the previous commit to
make wider use of the new getContentAsString methods on
OperationRequest and OperationResponse. It also adds such a method to
OperationRequestPart. Any code that previously got the content as a
byte array and then created a String has been updated to either use
getContentAsString or to use the charset from the Content-Type header
when creating a String.

See gh-126

spring-restdocs-core/src/main/java/org/springframework/restdocs/curl/CurlRequestSnippet.java

@@ -80,7 +80,6 @@ public class CurlRequestSnippet extends TemplatedSnippet {
 		writeHttpMethodIfNecessary(operation.getRequest(), printer);
 		writeHeaders(headers, printer);
 		writePartsIfNecessary(operation.getRequest(), printer);
-
 		writeContent(operation.getRequest(), printer);
 
 		return command.toString();
@@ -126,7 +125,7 @@ public class CurlRequestSnippet extends TemplatedSnippet {
 		for (OperationRequestPart part : request.getParts()) {
 			writer.printf(" -F '%s=", part.getName());
 			if (!StringUtils.hasText(part.getSubmittedFileName())) {
-				writer.append(new String(part.getContent()));
+				writer.append(part.getContentAsString());
 			}
 			else {
 				writer.printf("@%s", part.getSubmittedFileName());
@@ -141,8 +140,9 @@ public class CurlRequestSnippet extends TemplatedSnippet {
 	}
 
 	private void writeContent(OperationRequest request, PrintWriter writer) {
-		if (request.getContent().length > 0) {
-			writer.print(String.format(" -d '%s'", new String(request.getContent())));
+		String content = request.getContentAsString();
+		if (StringUtils.hasText(content)) {
+			writer.print(String.format(" -d '%s'", content));
 		}
 		else if (!request.getParts().isEmpty()) {
 			for (Entry<String, List<String>> entry : request.getParameters().entrySet()) {

spring-restdocs-core/src/main/java/org/springframework/restdocs/http/HttpRequestSnippet.java

@@ -16,7 +16,6 @@
 
 package org.springframework.restdocs.http;
 
-import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.ArrayList;
@@ -31,7 +30,6 @@ import org.springframework.http.MediaType;
 import org.springframework.restdocs.operation.Operation;
 import org.springframework.restdocs.operation.OperationRequest;
 import org.springframework.restdocs.operation.OperationRequestPart;
-import org.springframework.restdocs.snippet.ModelCreationException;
 import org.springframework.restdocs.snippet.Snippet;
 import org.springframework.restdocs.snippet.TemplatedSnippet;
 import org.springframework.util.StringUtils;
@@ -108,8 +106,9 @@ public class HttpRequestSnippet extends TemplatedSnippet {
 	private String getRequestBody(OperationRequest request) {
 		StringWriter httpRequest = new StringWriter();
 		PrintWriter writer = new PrintWriter(httpRequest);
-		if (request.getContent().length > 0) {
-			writer.print(requestBody(request));
+		String content = request.getContentAsString();
+		if (StringUtils.hasText(content)) {
+			writer.printf("%n%s", content);
 		}
 		else if (isPutOrPost(request)) {
 			if (request.getParts().isEmpty()) {
@@ -126,16 +125,6 @@ public class HttpRequestSnippet extends TemplatedSnippet {
 		return httpRequest.toString();
 	}
 
-	private String requestBody(OperationRequest request) {
-		try {
-			String content = request.getContentAsString();
-			return content.isEmpty() ? content : String.format("%n%s", content);
-		}
-		catch (IOException e) {
-			throw new ModelCreationException("Failed to create response body.", e);
-		}
-	}
-
 	private boolean isPutOrPost(OperationRequest request) {
 		return HttpMethod.PUT.equals(request.getMethod())
 				|| HttpMethod.POST.equals(request.getMethod());
@@ -163,7 +152,7 @@ public class HttpRequestSnippet extends TemplatedSnippet {
 	}
 
 	private void writePart(OperationRequestPart part, PrintWriter writer) {
-		writePart(part.getName(), new String(part.getContent()), part.getHeaders()
+		writePart(part.getName(), part.getContentAsString(), part.getHeaders()
 				.getContentType(), writer);
 	}
 

spring-restdocs-core/src/main/java/org/springframework/restdocs/http/HttpResponseSnippet.java

@@ -16,7 +16,6 @@
 
 package org.springframework.restdocs.http;
 
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -26,7 +25,6 @@ import java.util.Map.Entry;
 import org.springframework.http.HttpStatus;
 import org.springframework.restdocs.operation.Operation;
 import org.springframework.restdocs.operation.OperationResponse;
-import org.springframework.restdocs.snippet.ModelCreationException;
 import org.springframework.restdocs.snippet.Snippet;
 import org.springframework.restdocs.snippet.TemplatedSnippet;
 
@@ -69,13 +67,8 @@ public class HttpResponseSnippet extends TemplatedSnippet {
 	}
 
 	private String responseBody(OperationResponse response) {
-		try {
-			String content = response.getContentAsString();
-			return content.isEmpty() ? content : String.format("%n%s", content);
-		}
-		catch (IOException e) {
-			throw new ModelCreationException("Failed to create response body.", e);
-		}
+		String content = response.getContentAsString();
+		return content.isEmpty() ? content : String.format("%n%s", content);
 	}
 
 	private List<Map<String, String>> headers(OperationResponse response) {

spring-restdocs-core/src/main/java/org/springframework/restdocs/hypermedia/AbstractJsonLinkExtractor.java

@@ -38,7 +38,7 @@ abstract class AbstractJsonLinkExtractor implements LinkExtractor {
 	public Map<String, List<Link>> extractLinks(OperationResponse response)
 			throws IOException {
 		Map<String, Object> jsonContent = this.objectMapper.readValue(
-				new String(response.getContent()), Map.class);
+				response.getContent(), Map.class);
 		return extractLinks(jsonContent);
 	}
 

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/AbstractOperationMessage.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2014-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.restdocs.operation;
+
+import java.nio.charset.Charset;
+import java.util.Arrays;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+
+/**
+ * Abstract base class for operation requests, request parts, and responses.
+ *
+ * @author Andy Wilkinson
+ */
+abstract class AbstractOperationMessage {
+
+	private final byte[] content;
+
+	private final HttpHeaders headers;
+
+	AbstractOperationMessage(byte[] content, HttpHeaders headers) {
+		this.content = content == null ? new byte[0] : content;
+		this.headers = headers;
+	}
+
+	public byte[] getContent() {
+		return Arrays.copyOf(this.content, this.content.length);
+	}
+
+	public HttpHeaders getHeaders() {
+		return HttpHeaders.readOnlyHttpHeaders(this.headers);
+	}
+
+	public String getContentAsString() {
+		if (this.content.length > 0) {
+			Charset charset = extractCharsetFromContentTypeHeader();
+			return charset != null ? new String(this.content, charset) : new String(
+					this.content);
+		}
+		return "";
+	}
+
+	private Charset extractCharsetFromContentTypeHeader() {
+		if (this.headers == null) {
+			return null;
+		}
+		MediaType contentType = this.headers.getContentType();
+		if (contentType == null) {
+			return null;
+		}
+		return contentType.getCharSet();
+	}
+
+}

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/OperationRequest.java

@@ -16,7 +16,6 @@
 
 package org.springframework.restdocs.operation;
 
-import java.io.IOException;
 import java.net.URI;
 import java.util.Collection;
 
@@ -32,20 +31,22 @@ import org.springframework.http.HttpMethod;
 public interface OperationRequest {
 
 	/**
-	 * Returns the contents of the request. If the request has no content an empty array
-	 * is returned.
+	 * Returns the content of the request. If the request has no content an empty array is
+	 * returned.
 	 *
 	 * @return the contents, never {@code null}
 	 */
 	byte[] getContent();
 
 	/**
-	 * Returns the contents as string of the request. If the request has no content an empty string
-	 * is returned
+	 * Returns the content of the request as a {@link String}. If the request has no
+	 * content an empty string is returned. If the request has a {@code Content-Type}
+	 * header that specifies a charset then that charset will be used when converting the
+	 * contents to a {@code String}.
+	 *
 	 * @return the contents as string, never {@code null}
-	 * @throws IOException if an input or output exception occurred
 	 */
-	String getContentAsString() throws IOException;
+	String getContentAsString();
 
 	/**
 	 * Returns the headers that were included in the request.

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/OperationRequestPart.java

@@ -47,6 +47,16 @@ public interface OperationRequestPart {
 	 */
 	byte[] getContent();
 
+	/**
+	 * Returns the content of the part as a {@link String}. If the part has no content an
+	 * empty string is returned. If the part has a {@code Content-Type} header that
+	 * specifies a charset then that charset will be used when converting the contents to
+	 * a {@code String}.
+	 *
+	 * @return the contents as string, never {@code null}
+	 */
+	String getContentAsString();
+
 	/**
 	 * Returns the part's headers.
 	 *

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/OperationResponse.java

@@ -16,8 +16,6 @@
 
 package org.springframework.restdocs.operation;
 
-import java.io.IOException;
-
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 
@@ -45,7 +43,7 @@ public interface OperationResponse {
 	HttpHeaders getHeaders();
 
 	/**
-	 * Returns the contents of the response. If the response has no content an empty array
+	 * Returns the content of the response. If the response has no content an empty array
 	 * is returned.
 	 *
 	 * @return the contents, never {@code null}
@@ -53,10 +51,13 @@ public interface OperationResponse {
 	byte[] getContent();
 
 	/**
-	 * Returns the contents as string of the response. If the response has no content an empty string
-	 * is returned
+	 * Returns the content of the response as a {@link String}. If the response has no
+	 * content an empty string is returned. If the response has a {@code Content-Type}
+	 * header that specifies a charset then that charset will be used when converting the
+	 * contents to a {@code String}.
+	 *
 	 * @return the contents as string, never {@code null}
-	 * @throws IOException if an input or output exception occurred
 	 */
-	String getContentAsString() throws IOException;
+	String getContentAsString();
+
 }

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/StandardOperationRequest.java

@@ -16,28 +16,20 @@
 
 package org.springframework.restdocs.operation;
 
-import java.io.UnsupportedEncodingException;
 import java.net.URI;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
-import org.springframework.http.MediaType;
 
 /**
  * Standard implementation of {@link OperationRequest}.
  *
  * @author Andy Wilkinson
  */
-public class StandardOperationRequest implements OperationRequest {
-
-	private byte[] content;
-
-	private String characterEncoding;
-
-	private HttpHeaders headers;
+public class StandardOperationRequest extends AbstractOperationMessage implements
+		OperationRequest {
 
 	private HttpMethod method;
 
@@ -61,36 +53,13 @@ public class StandardOperationRequest implements OperationRequest {
 	public StandardOperationRequest(URI uri, HttpMethod method, byte[] content,
 			HttpHeaders headers, Parameters parameters,
 			Collection<OperationRequestPart> parts) {
+		super(content, headers);
 		this.uri = uri;
 		this.method = method;
-		this.content = content;
-		this.characterEncoding = detectCharsetFromContentTypeHeader(headers);
-		this.headers = headers;
 		this.parameters = parameters;
 		this.parts = parts;
 	}
 
-	@Override
-	public byte[] getContent() {
-		return Arrays.copyOf(this.content, this.content.length);
-	}
-	
-	@Override
-	public String getContentAsString() throws UnsupportedEncodingException {
-		if (content.length > 0) {
-			return characterEncoding != null ?
-					new String(content, characterEncoding) : new String(content);
-		}
-		else {
-			return "";
-		}
-	}
-
-	@Override
-	public HttpHeaders getHeaders() {
-		return this.headers;
-	}
-
 	@Override
 	public HttpMethod getMethod() {
 		return this.method;
@@ -111,14 +80,4 @@ public class StandardOperationRequest implements OperationRequest {
 		return this.uri;
 	}
 
-	private String detectCharsetFromContentTypeHeader(HttpHeaders headers) {
-		if (headers == null) {
-			return null;
-		}
-		MediaType contentType = headers.getContentType();
-		if (contentType == null) {
-			return null;
-		}
-		return contentType.getParameter("charset");
-	}
 }

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/StandardOperationRequestPart.java

@@ -23,16 +23,13 @@ import org.springframework.http.HttpHeaders;
  *
  * @author Andy Wilkinson
  */
-public class StandardOperationRequestPart implements OperationRequestPart {
+public class StandardOperationRequestPart extends AbstractOperationMessage implements
+		OperationRequestPart {
 
 	private final String name;
 
 	private final String submittedFileName;
 
-	private final byte[] content;
-
-	private final HttpHeaders headers;
-
 	/**
 	 * Creates a new {@code StandardOperationRequestPart} with the given {@code name}.
 	 *
@@ -43,10 +40,9 @@ public class StandardOperationRequestPart implements OperationRequestPart {
 	 */
 	public StandardOperationRequestPart(String name, String submittedFileName,
 			byte[] content, HttpHeaders headers) {
+		super(content, headers);
 		this.name = name;
 		this.submittedFileName = submittedFileName;
-		this.content = content;
-		this.headers = headers;
 	}
 
 	@Override
@@ -59,14 +55,4 @@ public class StandardOperationRequestPart implements OperationRequestPart {
 		return this.submittedFileName;
 	}
 
-	@Override
-	public byte[] getContent() {
-		return this.content;
-	}
-
-	@Override
-	public HttpHeaders getHeaders() {
-		return this.headers;
-	}
-
 }

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/StandardOperationResponse.java

@@ -16,27 +16,19 @@
 
 package org.springframework.restdocs.operation;
 
-import java.io.UnsupportedEncodingException;
-
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
-import org.springframework.http.MediaType;
 
 /**
  * Standard implementation of {@link OperationResponse}.
  *
  * @author Andy Wilkinson
  */
-public class StandardOperationResponse implements OperationResponse {
+public class StandardOperationResponse extends AbstractOperationMessage implements
+		OperationResponse {
 
 	private final HttpStatus status;
 
-	private final HttpHeaders headers;
-
-	private final byte[] content;
-
-	private String characterEncoding;
-
 	/**
 	 * Creates a new response with the given {@code status}, {@code headers}, and
 	 * {@code content}.
@@ -47,10 +39,8 @@ public class StandardOperationResponse implements OperationResponse {
 	 */
 	public StandardOperationResponse(HttpStatus status, HttpHeaders headers,
 			byte[] content) {
+		super(content, headers);
 		this.status = status;
-		this.headers = headers;
-		this.content = content;
-		this.characterEncoding = detectCharsetFromContentTypeHeader(headers);
 	}
 
 	@Override
@@ -58,35 +48,4 @@ public class StandardOperationResponse implements OperationResponse {
 		return this.status;
 	}
 
-	@Override
-	public HttpHeaders getHeaders() {
-		return this.headers;
-	}
-
-	@Override
-	public byte[] getContent() {
-		return this.content;
-	}
-
-	@Override
-	public String getContentAsString() throws UnsupportedEncodingException {
-		if (content.length > 0) {
-			return characterEncoding != null ?
-					new String(content, characterEncoding) : new String(content);
-		}
-		else {
-			return "";
-		}
-	}
-
-	private String detectCharsetFromContentTypeHeader(HttpHeaders headers) {
-		if (headers == null) {
-			return null;
-		}
-		MediaType contentType = headers.getContentType();
-		if (contentType == null) {
-			return null;
-		}
-		return contentType.getParameter("charset");
-	}
 }

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/ContentModifier.java

@@ -16,6 +16,7 @@
 
 package org.springframework.restdocs.operation.preprocess;
 
+import org.springframework.http.MediaType;
 import org.springframework.restdocs.operation.OperationRequest;
 import org.springframework.restdocs.operation.OperationResponse;
 
@@ -33,8 +34,9 @@ public interface ContentModifier {
 	 * Returns modified content based on the given {@code originalContent}.
 	 *
 	 * @param originalContent the original content
+	 * @param contentType the type of the original content, may be {@code null}
 	 * @return the modified content
 	 */
-	byte[] modifyContent(byte[] originalContent);
+	byte[] modifyContent(byte[] originalContent, MediaType contentType);
 
 }

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/ContentModifyingOperationPreprocessor.java

@@ -44,7 +44,8 @@ public class ContentModifyingOperationPreprocessor implements OperationPreproces
 
 	@Override
 	public OperationRequest preprocess(OperationRequest request) {
-		byte[] modifiedContent = this.contentModifier.modifyContent(request.getContent());
+		byte[] modifiedContent = this.contentModifier.modifyContent(request.getContent(),
+				request.getHeaders().getContentType());
 		return new StandardOperationRequest(request.getUri(), request.getMethod(),
 				modifiedContent,
 				getUpdatedHeaders(request.getHeaders(), modifiedContent),
@@ -53,8 +54,8 @@ public class ContentModifyingOperationPreprocessor implements OperationPreproces
 
 	@Override
 	public OperationResponse preprocess(OperationResponse response) {
-		byte[] modifiedContent = this.contentModifier
-				.modifyContent(response.getContent());
+		byte[] modifiedContent = this.contentModifier.modifyContent(
+				response.getContent(), response.getHeaders().getContentType());
 		return new StandardOperationResponse(response.getStatus(), getUpdatedHeaders(
 				response.getHeaders(), modifiedContent), modifiedContent);
 	}

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/LinkMaskingContentModifier.java

@@ -18,6 +18,8 @@ package org.springframework.restdocs.operation.preprocess;
 
 import java.util.regex.Pattern;
 
+import org.springframework.http.MediaType;
+
 /**
  * A content modifier the masks the {@code href} of any hypermedia links.
  *
@@ -41,8 +43,8 @@ class LinkMaskingContentModifier implements ContentModifier {
 	}
 
 	@Override
-	public byte[] modifyContent(byte[] originalContent) {
-		return this.contentModifier.modifyContent(originalContent);
+	public byte[] modifyContent(byte[] originalContent, MediaType contentType) {
+		return this.contentModifier.modifyContent(originalContent, contentType);
 	}
 
 }

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/PatternReplacingContentModifier.java

@@ -19,6 +19,8 @@ package org.springframework.restdocs.operation.preprocess;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import org.springframework.http.MediaType;
+
 /**
  * A {@link ContentModifier} that modifies the content by replacing occurrences of a
  * regular expression {@link Pattern}.
@@ -45,15 +47,29 @@ class PatternReplacingContentModifier implements ContentModifier {
 	}
 
 	@Override
-	public byte[] modifyContent(byte[] content) {
-		String original = new String(content);
+	public byte[] modifyContent(byte[] content, MediaType contentType) {
+		String original;
+		if (contentType != null && contentType.getCharSet() != null) {
+			original = new String(content, contentType.getCharSet());
+		}
+		else {
+			original = new String(content);
+		}
 		Matcher matcher = this.pattern.matcher(original);
 		StringBuilder buffer = new StringBuilder();
 		int previous = 0;
 		while (matcher.find()) {
-			buffer.append(original.substring(previous, matcher.start(1)));
+			String prefix;
+			if (matcher.groupCount() > 0) {
+				prefix = original.substring(previous, matcher.start(1));
+				previous = matcher.end(1);
+			}
+			else {
+				prefix = original.substring(previous, matcher.start());
+				previous = matcher.end();
+			}
+			buffer.append(prefix);
 			buffer.append(this.replacement);
-			previous = matcher.end(1);
 		}
 		if (previous < original.length()) {
 			buffer.append(original.substring(previous));

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/PrettyPrintingContentModifier.java

@@ -29,6 +29,8 @@ import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.stream.StreamResult;
 import javax.xml.transform.stream.StreamSource;
 
+import org.springframework.http.MediaType;
+
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 
@@ -44,7 +46,7 @@ public class PrettyPrintingContentModifier implements ContentModifier {
 					new XmlPrettyPrinter()));
 
 	@Override
-	public byte[] modifyContent(byte[] originalContent) {
+	public byte[] modifyContent(byte[] originalContent, MediaType contentType) {
 		for (PrettyPrinter prettyPrinter : PRETTY_PRINTERS) {
 			try {
 				return prettyPrinter.prettyPrint(originalContent).getBytes();

spring-restdocs-core/src/test/java/org/springframework/restdocs/http/HttpRequestSnippetTests.java

@@ -84,23 +84,22 @@ public class HttpRequestSnippetTests {
 				.request("http://localhost/foo").method("POST").content("Hello, world")
 				.build());
 	}
-	
+
 	@Test
 	public void postRequestWithCharset() throws IOException {
 		this.snippet.expectHttpRequest("post-request-with-charset").withContents(
-				httpRequest(POST, "/foo")
-				.header(HttpHeaders.HOST, "localhost")
-				.header("Content-Type", "text/plain;charset=UTF-8").content(
-						"こんにちわ, 世界")); // Hello, World in japanese.
+				httpRequest(RequestMethod.POST, "/foo")
+						.header(HttpHeaders.HOST, "localhost")
+						.header("Content-Type", "text/plain;charset=UTF-8")
+						.content("こんにちわ, 世界")); // Hello, World in Japanese
 
 		new HttpRequestSnippet().document(new OperationBuilder(
 				"post-request-with-charset", this.snippet.getOutputDirectory())
 				.request("http://localhost/foo").method("POST")
-				.header("Content-Type", "text/plain;charset=UTF-8")
-				.content("こんにちわ, 世界")
+				.header("Content-Type", "text/plain;charset=UTF-8").content("こんにちわ, 世界")
 				.build());
 	}
-	
+
 	@Test
 	public void postRequestWithParameter() throws IOException {
 		this.snippet.expectHttpRequest("post-request-with-parameter").withContents(

spring-restdocs-core/src/test/java/org/springframework/restdocs/http/HttpResponseSnippetTests.java

@@ -68,8 +68,7 @@ public class HttpResponseSnippetTests {
 	@Test
 	public void responseWithHeaders() throws IOException {
 		this.snippet.expectHttpResponse("response-with-headers").withContents(
-				httpResponse(HttpStatus.OK) //
-						.header("Content-Type", "application/json") //
+				httpResponse(HttpStatus.OK).header("Content-Type", "application/json")
 						.header("a", "alpha"));
 		new HttpResponseSnippet().document(new OperationBuilder("response-with-headers",
 				this.snippet.getOutputDirectory()).response()
@@ -84,15 +83,18 @@ public class HttpResponseSnippetTests {
 		new HttpResponseSnippet().document(new OperationBuilder("response-with-content",
 				this.snippet.getOutputDirectory()).response().content("content").build());
 	}
-	
+
 	@Test
 	public void responseWithCharset() throws IOException {
 		this.snippet.expectHttpResponse("response-with-charset").withContents(
-				httpResponse(OK).header("Content-Type", "text/plain;charset=UTF-8").content("コンテンツ"));
+				httpResponse(HttpStatus.OK).header("Content-Type",
+						"text/plain;charset=UTF-8").content("コンテンツ"));
 		new HttpResponseSnippet().document(new OperationBuilder("response-with-charset",
-				this.snippet.getOutputDirectory()).response().header("Content-Type", "text/plain;charset=UTF-8").content("コンテンツ").build());
+				this.snippet.getOutputDirectory()).response()
+				.header("Content-Type", "text/plain;charset=UTF-8").content("コンテンツ")
+				.build());
 	}
-	
+
 	@Test
 	public void responseWithCustomSnippetAttributes() throws IOException {
 		this.snippet.expectHttpResponse("response-with-snippet-attributes").withContents(

spring-restdocs-core/src/test/java/org/springframework/restdocs/operation/preprocess/ContentModifyingOperationPreprocessorTests.java

@@ -23,6 +23,7 @@ import org.junit.Test;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
 import org.springframework.restdocs.operation.OperationRequest;
 import org.springframework.restdocs.operation.OperationRequestPart;
 import org.springframework.restdocs.operation.OperationResponse;
@@ -46,7 +47,7 @@ public class ContentModifyingOperationPreprocessorTests {
 			new ContentModifier() {
 
 				@Override
-				public byte[] modifyContent(byte[] originalContent) {
+				public byte[] modifyContent(byte[] originalContent, MediaType mediaType) {
 					return "modified".getBytes();
 				}
 

spring-restdocs-core/src/test/java/org/springframework/restdocs/operation/preprocess/LinkMaskingContentModifierTests.java

@@ -52,37 +52,36 @@ public class LinkMaskingContentModifierTests {
 
 	@Test
 	public void halLinksAreMasked() throws Exception {
-		assertThat(this.contentModifier.modifyContent(halPayloadWithLinks(this.links)),
+		assertThat(
+				this.contentModifier.modifyContent(halPayloadWithLinks(this.links), null),
 				is(equalTo(halPayloadWithLinks(this.maskedLinks))));
 	}
 
 	@Test
 	public void formattedHalLinksAreMasked() throws Exception {
-		assertThat(
-				this.contentModifier
-						.modifyContent(formattedHalPayloadWithLinks(this.links)),
+		assertThat(this.contentModifier.modifyContent(
+				formattedHalPayloadWithLinks(this.links), null),
 				is(equalTo(formattedHalPayloadWithLinks(this.maskedLinks))));
 	}
 
 	@Test
 	public void atomLinksAreMasked() throws Exception {
-		assertThat(this.contentModifier.modifyContent(atomPayloadWithLinks(this.links)),
-				is(equalTo(atomPayloadWithLinks(this.maskedLinks))));
+		assertThat(this.contentModifier.modifyContent(atomPayloadWithLinks(this.links),
+				null), is(equalTo(atomPayloadWithLinks(this.maskedLinks))));
 	}
 
 	@Test
 	public void formattedAtomLinksAreMasked() throws Exception {
-		assertThat(
-				this.contentModifier
-						.modifyContent(formattedAtomPayloadWithLinks(this.links)),
+		assertThat(this.contentModifier.modifyContent(
+				formattedAtomPayloadWithLinks(this.links), null),
 				is(equalTo(formattedAtomPayloadWithLinks(this.maskedLinks))));
 	}
 
 	@Test
 	public void maskCanBeCustomized() throws Exception {
 		assertThat(
-				new LinkMaskingContentModifier("custom")
-						.modifyContent(formattedAtomPayloadWithLinks(this.links)),
+				new LinkMaskingContentModifier("custom").modifyContent(
+						formattedAtomPayloadWithLinks(this.links), null),
 				is(equalTo(formattedAtomPayloadWithLinks(new Link("a", "custom"),
 						new Link("b", "custom")))));
 	}

spring-restdocs-core/src/test/java/org/springframework/restdocs/operation/preprocess/PatternReplacingContentModifierTests.java

@@ -16,9 +16,11 @@
 
 package org.springframework.restdocs.operation.preprocess;
 
+import java.nio.charset.Charset;
 import java.util.regex.Pattern;
 
 import org.junit.Test;
+import org.springframework.http.MediaType;
 
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.CoreMatchers.is;
@@ -35,13 +37,23 @@ public class PatternReplacingContentModifierTests {
 	@Test
 	public void patternsAreReplaced() throws Exception {
 		Pattern pattern = Pattern.compile(
-				"([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})",
+				"[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}",
 				Pattern.CASE_INSENSITIVE);
 		PatternReplacingContentModifier contentModifier = new PatternReplacingContentModifier(
 				pattern, "<<uuid>>");
-		assertThat(
-				contentModifier.modifyContent("{\"id\" : \"CA761232-ED42-11CE-BACD-00AA0057B223\"}"
-						.getBytes()), is(equalTo("{\"id\" : \"<<uuid>>\"}".getBytes())));
+		assertThat(contentModifier.modifyContent(
+				"{\"id\" : \"CA761232-ED42-11CE-BACD-00AA0057B223\"}".getBytes(), null),
+				is(equalTo("{\"id\" : \"<<uuid>>\"}".getBytes())));
+	}
+
+	@Test
+	public void encodingIsPreserved() {
+		Pattern pattern = Pattern.compile("[0-9]+");
+		PatternReplacingContentModifier contentModifier = new PatternReplacingContentModifier(
+				pattern, "<<number>>");
+		assertThat(contentModifier.modifyContent("こんにちわ, 世界 123".getBytes(),
+				new MediaType("text", "plain", Charset.forName("UTF-8"))),
+				is(equalTo("こんにちわ, 世界 <<number>>".getBytes())));
 	}
 
 }

spring-restdocs-core/src/test/java/org/springframework/restdocs/operation/preprocess/PrettyPrintingContentModifierTests.java

@@ -31,16 +31,16 @@ public class PrettyPrintingContentModifierTests {
 
 	@Test
 	public void prettyPrintJson() throws Exception {
-		assertThat(
-				new PrettyPrintingContentModifier().modifyContent("{\"a\":5}".getBytes()),
-				equalTo(String.format("{%n  \"a\" : 5%n}").getBytes()));
+		assertThat(new PrettyPrintingContentModifier().modifyContent(
+				"{\"a\":5}".getBytes(), null), equalTo(String.format("{%n  \"a\" : 5%n}")
+				.getBytes()));
 	}
 
 	@Test
 	public void prettyPrintXml() throws Exception {
-		assertThat(
-				new PrettyPrintingContentModifier().modifyContent("<one a=\"alpha\"><two b=\"bravo\"/></one>"
-						.getBytes()), equalTo(String.format(
+		assertThat(new PrettyPrintingContentModifier().modifyContent(
+				"<one a=\"alpha\"><two b=\"bravo\"/></one>".getBytes(), null),
+				equalTo(String.format(
 						"<?xml version=\"1.0\" encoding=\"UTF-8\"?>%n"
 								+ "<one a=\"alpha\">%n    <two b=\"bravo\"/>%n</one>%n")
 						.getBytes()));
@@ -48,14 +48,15 @@ public class PrettyPrintingContentModifierTests {
 
 	@Test
 	public void empytContentIsHandledGracefully() throws Exception {
-		assertThat(new PrettyPrintingContentModifier().modifyContent("".getBytes()),
+		assertThat(
+				new PrettyPrintingContentModifier().modifyContent("".getBytes(), null),
 				equalTo("".getBytes()));
 	}
 
 	@Test
 	public void nonJsonAndNonXmlContentIsHandledGracefully() throws Exception {
 		String content = "abcdefg";
-		assertThat(new PrettyPrintingContentModifier().modifyContent(content.getBytes()),
-				equalTo(content.getBytes()));
+		assertThat(new PrettyPrintingContentModifier().modifyContent(content.getBytes(),
+				null), equalTo(content.getBytes()));
 	}
 }