Nick Burch created COMPRESS-298:
-----------------------------------
Summary: Cleaner way to catch/detect Seven7 files which are
password protected
Key: COMPRESS-298
URL: https://issues.apache.org/jira/browse/COMPRESS-298
Project: Commons Compress
Issue Type: Improvement
Components: Archivers
Affects Versions: 1.8.1
Reporter: Nick Burch
Currently, if we open a password protected 7z file and call {{getNextEntry()}}
on it, it will blow up with an IOException with a specific string:
{code}
java.io.IOException: Cannot read encrypted files without a password
at
org.apache.commons.compress.archivers.sevenz.AES256SHA256Decoder$1.init(AES256SHA256Decoder.java:56)
at
org.apache.commons.compress.archivers.sevenz.AES256SHA256Decoder$1.read(AES256SHA256Decoder.java:112)
at java.io.DataInputStream.readUnsignedByte(DataInputStream.java:288)
at org.tukaani.xz.rangecoder.RangeDecoderFromStream.<init>(Unknown
Source)
at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)
at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)
at org.tukaani.xz.LZMAInputStream.<init>(Unknown Source)
at
org.apache.commons.compress.archivers.sevenz.Coders$LZMADecoder.decode(Coders.java:113)
at
org.apache.commons.compress.archivers.sevenz.Coders.addDecoder(Coders.java:77)
at
org.apache.commons.compress.archivers.sevenz.SevenZFile.buildDecoderStack(SevenZFile.java:853)
at
org.apache.commons.compress.archivers.sevenz.SevenZFile.buildDecodingStream(SevenZFile.java:820)
at
org.apache.commons.compress.archivers.sevenz.SevenZFile.getNextEntry(SevenZFile.java:151)
{code}
It would be good if either a specific subtype of IOException could be thrown
(which could then be caught to differentiate this from other kinds of IO
problems), or if a method could be added to SevenZFile which could be called to
see if a password is needed / given password is correct
(If implemented, this would help make the code in Tika dealing with 7z files
cleaner)
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