Use the platform-specific line separator in Authorization header (#555)

JAVA-3782

Co-authored-by: fhassak <fares-externe.hassak@enedis.fr>

Author: 2 people

config/findbugs-exclude.xml

@@ -169,4 +169,10 @@
         <Bug pattern="RCN_REDUNDANT_NULLCHECK_WOULD_HAVE_BEEN_A_NPE"/>
     </Match>
 
+    <!-- AWS use UNIX-style line endings -->
+    <Match>
+        <Class name="com.mongodb.internal.connection.AuthorizationHeader"/>
+        <Bug pattern="VA_FORMAT_STRING_USES_NEWLINE"/>
+    </Match>
+
 </FindBugsFilter>

driver-core/src/main/com/mongodb/internal/connection/AuthorizationHeader.java

@@ -115,7 +115,7 @@ static String getSignedHeaders(final Map<String, String> requestHeaders) {
 
     static String getCanonicalHeaders(final Map<String, String> requestHeaders) {
         return requestHeaders.entrySet().stream()
-                .map(kvp -> String.format("%s:%s%n", kvp.getKey().toLowerCase(), kvp.getValue().trim().replaceAll(" +", " ")))
+                .map(kvp -> String.format("%s:%s\n", kvp.getKey().toLowerCase(), kvp.getValue().trim().replaceAll(" +", " ")))
                 .sorted()
                 .collect(Collectors.joining(""));
     }