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GUAC-587: Ensure resource streams are always closed.

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This commit is contained in:
Michael Jumper
2015-05-20 22:41:08 -07:00
parent d7690d1ad8
commit 4b3197f57a
1 changed files with 46 additions and 8 deletions
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54
guacamole/src/main/java/org/glyptodon/guacamole/net/basic/extension/LanguageResourceService.java
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@@ -145,6 +145,42 @@ public class LanguageResourceService {
}
/**
* Parses the given language resource, returning the resulting JsonNode.
* If the resource cannot be read because it does not exist, null is
* returned.
*
* @param resource
* The language resource to parse. Language resources must have the
* mimetype "application/json".
*
* @return
* A JsonNode representing the root of the parsed JSON tree, or null if
* the given resource does not exist.
*
* @throws IOException
* If an error occurs while parsing the resource as JSON.
*/
private JsonNode parseLanguageResource(Resource resource) throws IOException {
// Get resource stream
InputStream stream = resource.asStream();
if (stream == null)
return null;
// Parse JSON tree
try {
JsonNode tree = mapper.readTree(stream);
return tree;
}
// Ensure stream is always closed
finally {
stream.close();
}
}
/**
* Adds or overlays the given language resource, which need not exist in
* the ServletContext. If a language resource is already defined for the
@@ -169,17 +205,19 @@ public class LanguageResourceService {
try {
// Get resource stream
InputStream existingStream = existing.asStream();
InputStream resourceStream = resource.asStream();
if (existingStream == null || resourceStream == null) {
logger.warn("Language resource \"{}\" does not exist.", key);
// Read the original language resource
JsonNode existingTree = parseLanguageResource(existing);
if (existingTree == null) {
logger.warn("Base language resource \"{}\" does not exist.", key);
return;
}
// Read the original and new language resources
JsonNode existingTree = mapper.readTree(existingStream);
JsonNode resourceTree = mapper.readTree(resourceStream);
// Read new language resource
JsonNode resourceTree = parseLanguageResource(resource);
if (resourceTree == null) {
logger.warn("Overlay language resource \"{}\" does not exist.", key);
return;
}
// Merge the language resources
JsonNode mergedTree = mergeTranslations(existingTree, resourceTree);