Tetiana Tvardovska created TIKA-3590:
----------------------------------------
Summary: OSX DMG files wrong MIME type detection (wrong MediaType
and Supertype)
Key: TIKA-3590
URL: https://issues.apache.org/jira/browse/TIKA-3590
Project: Tika
Issue Type: Bug
Components: core
Affects Versions: 2.1.0, 2.0.0-BETA, 2.0.0-ALPHA, 1.27, 1.26
Reporter: Tetiana Tvardovska
Calling {{mimeSupport.detectMimeTypes}} for OSX DMG files returns a wrong
value.
DMG files are detected as MIME type: {{*"application/zlib"*}} or
*{{"application/x-bzip"}}*
instead of expected: *{{"application/x-apple-diskimage".}}*
Error is caused by {{getSupertype}} method which returns a wrong type (too
"super" {{{}MediaType.OCTET_STREAM){}}}for OSX DMG files instead of
{{{}*"application/zlib" or* {*}"application/x-bzip"{*}{*}{*}{}}}.
For information, DMG mime type is correctly detected when debugging the method
{code:java}
org/apache/tika/mime/MimeTypes.java:484 public MediaType detect(...
522: MimeType hint = getMimeType(name);
{code}
the {{hint}} value gets a correct *{{"application/x-apple-diskimage"}}* value
here.
But later the {{hint}} value is not taken into consideration for
{{possibleTypes}} as {{applyHint}} results:
{code:java}
529: possibleTypes = applyHint(possibleTypes, hint);{code}
This wrong value is returned to :
{code:java}
repository/org/apache/tika/tika-core/1.26/tika-core-1.26-sources.jar!/org/apache/tika/detect/CompositeDetector.java:84
MediaType detected = detector.detect(input, metadata);
if (registry.isSpecializationOf(detected, type)) {
type = detected;
}
{code}
h3. Possible solution -Add a more precise Supertype detection for
"{{{}*application/x-apple-diskimage*{}}}" type
Just add one more verification into the
{{{}MediaTypeRegistry.{}}}{{getSupertype}} method, for example, in a
'diff'-like format:
{{org/apache/tika/tika-core/1.26/tika-core-1.26-sources.jar}}
{{org/apache/tika/mime/MediaTypeRegistry.java:187}}
{code:java}
public MediaType getSupertype(MediaType type) {
...
+ } else if (type.getSubtype().endsWith("x-apple-diskimage")) {
+ return MediaType.application("x-bzip");
+ }
...
}
{code}
or
{code:java}
public MediaType getSupertype(MediaType type) {
...
+ } else if (type.getSubtype().endsWith("x-apple-diskimage")) {
+ return MediaType.APPLICATION_ZIP;
+ }
...
}
{code}
---
Tested at project [Sonatype Nexus|https://github.com/sonatype/nexus-public/]
{{release-3.36.0-01 }}for RAW repository with a "Strict Content Type
Validation" set ON when trying to upload *.dmg files.
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