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snippet inject support like <head lang="en"> #8736

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merged 12 commits into from
Aug 9, 2023
Merged

snippet inject support like <head lang="en"> #8736

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1aaa862
snippet inject support like <head lang="en">
oliver-zhang Jun 15, 2023
f878ca1
code format
oliver-zhang Jun 15, 2023
b4d9d15
Let user passed multiple head tag
oliver-zhang Jun 16, 2023
a8275f9
Check head tag start with <head and end with >
oliver-zhang Jun 19, 2023
41c461d
Update instrumentation/servlet/servlet-common/bootstrap/src/main/java…
oliver-zhang Jun 20, 2023
9d82f76
add test case
oliver-zhang Jul 5, 2023
fab6cec
add test case
oliver-zhang Jul 6, 2023
368dbfe
Revert "add test case"
oliver-zhang Jul 20, 2023
85d36ee
remove the new integration tests and add new tests to the unit tests
oliver-zhang Jul 20, 2023
126fe01
refactor the code
oliver-zhang Jul 20, 2023
65b7b7d
code format
oliver-zhang Jul 20, 2023
8025b30
Merge branch 'main' into servlet-snippet-inject
laurit Aug 9, 2023
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16 changes: 16 additions & 0 deletions .../opentelemetry/javaagent/instrumentation/servlet/v3_0/snippet/SnippetPrintWriterTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,22 @@ void testWriteWithOffset() throws IOException {
assertThat(response.getStringContent()).isEqualTo(expectedHtml);
}

@Test
void testInjectToTextHtmlWithOtherHeadStyle() throws IOException {
String snippet = "\n <script type=\"text/javascript\"> Test </script>";
String html = readFileAsString("beforeSnippetInjectionWithOtherHeadStyle.html");

InMemoryHttpServletResponse response = createInMemoryHttpServletResponse("text/html");
Servlet3SnippetInjectingResponseWrapper responseWrapper =
new Servlet3SnippetInjectingResponseWrapper(response, snippet);

responseWrapper.getWriter().write(html);
responseWrapper.getWriter().flush();

String expectedHtml = readFileAsString("afterSnippetInjectionWithOtherHeadStyle.html");
assertThat(response.getStringContent()).isEqualTo(expectedHtml);
}

private static InMemoryHttpServletResponse createInMemoryHttpServletResponse(String contentType) {
HttpServletResponse response = mock(HttpServletResponse.class);
when(response.getContentType()).thenReturn(contentType);
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19 changes: 19 additions & 0 deletions ...emetry/javaagent/instrumentation/servlet/v3_0/snippet/SnippetServletOutputStreamTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,25 @@ void testHeadTagSplitAcrossTwoWrites() throws IOException {
assertThat(out.getBytes()).isEqualTo(expectedSecondPart.getBytes(UTF_8));
}

@Test
void testInjectionWithOtherHeadStyle() throws IOException {
String snippet = "\n <script type=\"text/javascript\"> Test </script>";
byte[] html = readFileAsBytes("beforeSnippetInjectionWithOtherHeadStyle.html");

InjectionState obj = createInjectionStateForTesting(snippet, UTF_8);
InMemoryServletOutputStream out = new InMemoryServletOutputStream();

Supplier<String> stringSupplier = snippet::toString;
OutputStreamSnippetInjectionHelper helper =
new OutputStreamSnippetInjectionHelper(stringSupplier);
boolean injected = helper.handleWrite(obj, out, html, 0, html.length);
assertThat(obj.getHeadTagBytesSeen()).isEqualTo(-1);
assertThat(injected).isEqualTo(true);

byte[] expectedHtml = readFileAsBytes("afterSnippetInjectionWithOtherHeadStyle.html");
assertThat(out.getBytes()).isEqualTo(expectedHtml);
}

private static InjectionState createInjectionStateForTesting(String snippet, Charset charset) {
HttpServletResponse response = mock(HttpServletResponse.class);
when(response.isCommitted()).thenReturn(false);
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11 changes: 11 additions & 0 deletions ...-3.0/javaagent-unit-tests/src/test/resources/afterSnippetInjectionWithOtherHeadStyle.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
<!DOCTYPE html>
<html lang="en">
<head lang="en">
<script type="text/javascript"> Test </script>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

</body>
</html>
10 changes: 10 additions & 0 deletions ...3.0/javaagent-unit-tests/src/test/resources/beforeSnippetInjectionWithOtherHeadStyle.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
<!DOCTYPE html>
<html lang="en">
<head lang="en">
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

</body>
</html>
3 changes: 2 additions & 1 deletion ...vaagent/instrumentation/servlet/v3_0/snippet/Servlet3SnippetInjectingResponseWrapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -150,7 +150,8 @@ public boolean isContentTypeTextHtml() {
if (contentType == null) {
contentType = super.getHeader("content-type");
}
return contentType != null && contentType.startsWith("text/html");
return contentType != null
&& (contentType.startsWith("text/html") || contentType.startsWith("application/xhtml+xml"));
}

@Override
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16 changes: 16 additions & 0 deletions .../opentelemetry/javaagent/instrumentation/servlet/v5_0/snippet/SnippetPrintWriterTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,22 @@ void testWriteWithOffset() throws IOException {
assertThat(response.getStringContent()).isEqualTo(expectedHtml);
}

@Test
void testInjectToTextHtmlWithOtherHeadStyle() throws IOException {
String snippet = "\n <script type=\"text/javascript\"> Test </script>";
String html = TestUtil.readFileAsString("beforeSnippetInjectionWithOtherHeadStyle.html");

InMemoryHttpServletResponse response = createInMemoryHttpServletResponse("text/html");
Servlet5SnippetInjectingResponseWrapper responseWrapper =
new Servlet5SnippetInjectingResponseWrapper(response, snippet);

responseWrapper.getWriter().write(html);
responseWrapper.getWriter().flush();

String expectedHtml = TestUtil.readFileAsString("afterSnippetInjectionWithOtherHeadStyle.html");
assertThat(response.getStringContent()).isEqualTo(expectedHtml);
}

private static InMemoryHttpServletResponse createInMemoryHttpServletResponse(String contentType) {
HttpServletResponse response = mock(HttpServletResponse.class);
when(response.getContentType()).thenReturn(contentType);
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19 changes: 19 additions & 0 deletions ...emetry/javaagent/instrumentation/servlet/v5_0/snippet/SnippetServletOutputStreamTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,25 @@ void testHeadTagSplitAcrossTwoWrites() throws IOException {
assertThat(out.getBytes()).isEqualTo(expectedSecondPart.getBytes(UTF_8));
}

@Test
void testInjectionWithOtherHeadStyle() throws IOException {
String snippet = "\n <script type=\"text/javascript\"> Test </script>";
byte[] html = readFileAsBytes("beforeSnippetInjectionWithOtherHeadStyle.html");

InjectionState obj = createInjectionStateForTesting(snippet, UTF_8);
InMemoryServletOutputStream out = new InMemoryServletOutputStream();

Supplier<String> stringSupplier = snippet::toString;
OutputStreamSnippetInjectionHelper helper =
new OutputStreamSnippetInjectionHelper(stringSupplier);
boolean injected = helper.handleWrite(obj, out, html, 0, html.length);
assertThat(obj.getHeadTagBytesSeen()).isEqualTo(-1);
assertThat(injected).isEqualTo(true);

byte[] expectedHtml = readFileAsBytes("afterSnippetInjectionWithOtherHeadStyle.html");
assertThat(out.getBytes()).isEqualTo(expectedHtml);
}

private static InjectionState createInjectionStateForTesting(String snippet, Charset charset) {
HttpServletResponse response = mock(HttpServletResponse.class);
when(response.isCommitted()).thenReturn(false);
Expand Down
11 changes: 11 additions & 0 deletions ...-5.0/javaagent-unit-tests/src/test/resources/afterSnippetInjectionWithOtherHeadStyle.html
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
<!DOCTYPE html>
<html lang="en">
<head lang="en">
<script type="text/javascript"> Test </script>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

</body>
</html>
10 changes: 10 additions & 0 deletions ...5.0/javaagent-unit-tests/src/test/resources/beforeSnippetInjectionWithOtherHeadStyle.html
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
<!DOCTYPE html>
<html lang="en">
<head lang="en">
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

</body>
</html>
3 changes: 2 additions & 1 deletion ...vaagent/instrumentation/servlet/v5_0/snippet/Servlet5SnippetInjectingResponseWrapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -142,7 +142,8 @@ public boolean isContentTypeTextHtml() {
if (contentType == null) {
contentType = super.getHeader("content-type");
}
return contentType != null && contentType.startsWith("text/html");
return contentType != null
&& (contentType.startsWith("text/html") || contentType.startsWith("application/xhtml+xml"));
}

@Override
Expand Down
9 changes: 5 additions & 4 deletions .../bootstrap/src/main/java/io/opentelemetry/javaagent/bootstrap/servlet/InjectionState.java
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
// this is shared by both ServletOutputStream and PrintWriter injection
public class InjectionState {
private static final int HEAD_TAG_WRITTEN_FAKE_VALUE = -1;
private static final int HEAD_TAG_LENGTH = "<head>".length();
private static final int HEAD_TAG_PREFIX_LENGTH = "<head".length();
private final SnippetInjectingResponseWrapper wrapper;
private int headTagBytesSeen = 0;

Expand Down Expand Up @@ -45,7 +45,7 @@ public boolean processByte(int b) {
} else {
headTagBytesSeen = 0;
}
if (headTagBytesSeen == HEAD_TAG_LENGTH) {
if (headTagBytesSeen > HEAD_TAG_PREFIX_LENGTH && b == '>') {
setHeadTagWritten();
return true;
} else {
Expand All @@ -64,10 +64,11 @@ private boolean inHeadTag(int b) {
return true;
} else if (headTagBytesSeen == 4 && b == 'd') {
return true;
} else if (headTagBytesSeen == 5 && b == '>') {
} else if (headTagBytesSeen == 5 && (b == '>' || Character.isWhitespace(b))) {
return true;
} else {
return headTagBytesSeen > 5;
}
return false;
}

public SnippetInjectingResponseWrapper getWrapper() {
Expand Down
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