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From "Christopher Watford (Jira)" <j...@apache.org>
Subject [jira] [Commented] (FOP-2146) Wrong FontCache-Directory used for not existing userHome in FontCache.getDefaultCacheFile() (Bug 47786 was not fixed correctly)
Date Tue, 12 Jan 2021 21:42:00 GMT

    [ https://issues.apache.org/jira/browse/FOP-2146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17263712#comment-17263712
] 

Christopher Watford commented on FOP-2146:
------------------------------------------

When you use the PDFTranscoder, it is not possible to disable the font cache or change the
font cache file:
{code:java}
DefaultConfigurationBuilder cfgBuilder = new DefaultConfigurationBuilder();
Configuration cfg = cfgBuilder.build(getClass().getResourceAsStream("fop-config.xml"));

PDFTranscoder transcoder = new PDFTranscoder(); 
transcoder.configure(cfg);

TranscoderInput input = new TranscoderInput(getSVGDocument());
ByteArrayOutputStream output = new ByteArrayOutputStream();
TranscoderOutput transOutput = new TranscoderOutput(output);
transcoder.transcode(input, transOutput);
{code}
This is because when you dive into the guts:
 # PDFDocumentGraphics2DConfigurator gets created and configures itself using the configuration
passed to the transcoder.
 # A new FontManager is created within PDFDocumentGraphics2DConfigurator, which DOES NOT
use the configuration passed to the transcoder.
 # This FontManager is then used in DefaultFontConfigurator, and if there were any system
fonts, they are saved.
 # The FontManager at this point is configured to use a relative directory called ".fop" which
ends up being local to a read-only file system.

This is in spite of either use-cache being false, or cache-file pointing to another location.

The FontManager created within the PDFDocumentGraphics2DConfigurator needs to get its cache
location from the FOP configuration.

> Wrong FontCache-Directory used for not existing userHome in FontCache.getDefaultCacheFile()
(Bug 47786 was not fixed correctly)
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: FOP-2146
>                 URL: https://issues.apache.org/jira/browse/FOP-2146
>             Project: FOP
>          Issue Type: Bug
>          Components: font/unqualified
>    Affects Versions: 1.1
>         Environment: Operating System: All
> Platform: All
>            Reporter: mg
>
> Method getDefaultCacheFile() returns an invalid file name if the user has no home directory
set. In that case the name of the fop user directory (FOP_USER_DIR!) is returned and not the
name of the cache file (DEFAULT_CACHE_FILENAME).
> Wrong Code:
>     public static File getDefaultCacheFile(boolean forWriting) {
>         File userHome = getUserHome();
>         if (userHome != null) {
>             File fopUserDir = new File(userHome, FOP_USER_DIR);
>             if (forWriting) {
>                 boolean writable = fopUserDir.canWrite();
>                 if (!fopUserDir.exists()) {
>                     writable = fopUserDir.mkdir();
>                 }
>                 if (!writable) {
>                     userHome = getTempDirectory();
>                     fopUserDir = new File(userHome, FOP_USER_DIR);
>                     fopUserDir.mkdir();
>                 }
>             }
>             return new File(fopUserDir, DEFAULT_CACHE_FILENAME);
>         }
>         return new File(FOP_USER_DIR);
>     }
> If getUserHome() does not return a directory the default name must be returned (and not
the name of the directory):
>         return new File(DEFAULT_CACHE_FILENAME);



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