Normalize JSON5 upsert as text upsert to properly replicate JSON5 content

Author: ks-yim

common/src/main/java/com/linecorp/centraldogma/common/Change.java

@@ -84,7 +84,7 @@ static Change<String> ofTextUpsert(String path, byte[] content) {
     static Change<String> ofTextUpsert(String path, String text) {
         requireNonNull(text, "text");
         validateFilePath(path, "path");
-        if (EntryType.guessFromPath(path) == EntryType.JSON) {
+        if (EntryType.guessFromPath(path) == EntryType.JSON && !isJson5(path)) {
             throw new ChangeFormatException("invalid file type: " + path +
                                             " (expected: a non-JSON file). Use Change.ofJsonUpsert() instead");
         }

it/src/test/java/com/linecorp/centraldogma/it/TestConstants.java

@@ -19,8 +19,6 @@
 import static java.util.Objects.requireNonNull;
 
 import java.io.File;
-import java.io.IOException;
-import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;

server/src/main/java/com/linecorp/centraldogma/server/internal/storage/repository/git/GitRepository.java

@@ -754,7 +754,7 @@ private Map<String, Change<?>> toChangeMap(List<DiffEntry> diffEntryList) {
                 switch (diffEntry.getChangeType()) {
                     case MODIFY:
                         // Resolve JSON5 as EntryType.TEXT to modify it with text patch because
-                        // json patch can hardly be applied to JSON5.
+                        // applying json patch to JSON5 file makes it a plain JSON.
                         final EntryType oldEntryType = !isJson5(oldPath) ? EntryType.guessFromPath(oldPath)
                                                                          : EntryType.TEXT;
                         switch (oldEntryType) {
@@ -798,7 +798,10 @@ private Map<String, Change<?>> toChangeMap(List<DiffEntry> diffEntryList) {
                         }
                         break;
                     case ADD:
-                        final EntryType newEntryType = EntryType.guessFromPath(newPath);
+                        // Resolve JSON5 as EntryType.TEXT so that the JSON5 content can properly be included
+                        // in the serialized ReplicationLog.
+                        final EntryType newEntryType = !isJson5(newPath) ? EntryType.guessFromPath(newPath)
+                                                                         : EntryType.TEXT;
                         switch (newEntryType) {
                             case JSON: {
                                 final String jsonText = new String(