+++ date = "2017-03-01T17:08:52+02:00" author = "Alan Orth" title = "March, 2017" tags = ["Notes"]

+++

2017-03-01

• Run the 279 CIAT author corrections on CGSpace

2017-03-02

• Skype with Michael and Peter, discussing moving the CGIAR Library to CGSpace
• CGIAR people possibly open to moving content, redirecting library.cgiar.org to CGSpace and letting CGSpace resolve their handles
• They might come in at the top level in one "CGIAR System" community, or with several communities
• I need to spend a bit of time looking at the multiple handle support in DSpace and see if new content can be minted in both handles, or just one?
• Need to send Peter and Michael some notes about this in a few days
• Also, need to consider talking to Atmire about hiring them to bring ORCiD metadata to REST / OAI
• Filed an issue on DSpace issue tracker for the filter-media bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: DS-3516
• Discovered that the ImageMagic filter-media plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK
• Interestingly, it seems DSpace 4.x's thumbnails were sRGB, but forcing regeneration using DSpace 5.x's ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see 10568/51999):

$ identify ~/Desktop/alc_contrastes_desafios.jpg
/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600+0+0 8-bit CMYK 168KB 0.000u 0:00.000

• This results in discolored thumbnails when compared to the original PDF, for example sRGB and CMYK:

• I filed an issue for the color space thing: DS-3517

2017-03-03

• I created a patch for DS-3517 and made a pull request against upstream dspace-5_x: https://github.com/DSpace/DSpace/pull/1669
• Looks like -colorspace sRGB alone isn't enough, we need to use profiles:

$ convert alc_contrastes_desafios.pdf\[0\] -profile /opt/brew/Cellar/ghostscript/9.20/share/ghostscript/9.20/iccprofiles/default_cmyk.icc -thumbnail 300x300 -flatten -profile /opt/brew/Cellar/ghostscript/9.20/share/ghostscript/9.20/iccprofiles/default_rgb.icc alc_contrastes_desafios.pdf.jpg

• This reads the input file, applies the CMYK profile, applies the RGB profile, then writes the file
• Note that you should set the first profile immediately after the input file
• Also, it is better to use profiles than setting -colorspace
• This is a great resource describing the color stuff: http://www.imagemagick.org/Usage/formats/#profiles
• Somehow we need to detect the color system being used by the input file and handle each case differently (with profiles)
• This is trivial with identify (even by the Java ImageMagick API):

$ identify -format '%r\n' alc_contrastes_desafios.pdf\[0\]
DirectClass CMYK
$ identify -format '%r\n' Africa\ group\ of\ negotiators.pdf\[0\]
DirectClass sRGB Alpha

2017-03-04

• Spent more time looking at the ImageMagick CMYK issue
• The default_cmyk.icc and default_rgb.icc files are both part of the Ghostscript GPL distribution, but according to DSpace's LICENSES_THIRD_PARTY file, DSpace doesn't allow distribution of dependencies that are licensed solely under the GPL
• So this issue is kinda pointless now, as the ICC profiles are absolutely necessary to make a meaningful CMYK→sRGB conversion

2017-03-05

• Look into helping developers from landportal.info with a query for items related to LAND on the REST API
• They want something like the items that are returned by the general "LAND" query in the search interface, but we cannot do that
• We can only return specific results for metadata fields, like:

$ curl -s -H "accept: application/json" -H "Content-Type: application/json" -X POST "https://dspacetest.cgiar.org/rest/items/find-by-metadata-field" -d '{"key": "cg.subject.ilri","value": "LAND REFORM", "language": null}' | json_pp

• But there are hundreds of combinations of fields and values (like dc.subject and all the center subjects), and we can't use wildcards in REST!
• Reading about enabling multiple handle prefixes in DSpace
• There is a mailing list thread from 2011 about it: http://dspace.2283337.n4.nabble.com/Multiple-handle-prefixes-merged-DSpace-instances-td3427192.html
• And a comment from Atmire's Bram about it on the DSpace wiki: https://wiki.duraspace.org/display/DSDOC5x/Installing+DSpace?focusedCommentId=78163296#comment-78163296
• Bram mentions an undocumented configuration option handle.plugin.checknameauthority, but I noticed another one in dspace.cfg:

# List any additional prefixes that need to be managed by this handle server
# (as for examle handle prefix coming from old dspace repository merged in
# that repository)
# handle.additional.prefixes = prefix1[, prefix2]

• Because of this I noticed that our Handle server's config.dct was potentially misconfigured!
• We had some default values still present:

"300:0.NA/YOUR_NAMING_AUTHORITY"

• I've changed them to the following and restarted the handle server:

"300:0.NA/10568"

• In looking at all the configs I just noticed that we are not providing a DOI in the Google-specific metadata crosswalk
• From dspace/config/crosswalks/google-metadata.properties:

google.citation_doi = cg.identifier.doi

• This works, and makes DSpace output the following metadata on the item view page:

<meta content="https://dx.doi.org/10.1186/s13059-017-1153-y" name="citation_doi">

• Submitted and merged pull request for this: https://github.com/ilri/DSpace/pull/305