Adding pdftotext for PDF support in Hypercube

[dannylamb]

GitHub Issue: Islandora/documentation#933

What does this Pull Request do?

Adds pdftotext support for Hypercube.

What's new?

Hypercube now checks the content type of the resource and uses pdftotext if it receives a PDF.

How should this be tested?

• sudo apt-get install pdftotext
• Pull this down into crayfish
• Update the executable entry in config.yaml to be tesseract_executable and pdftotext_executable as per config.example.yaml.
• Upload a PDF
• Hit hypercube with something like this: curl -H "Authorization: Bearer islandora" -H "Apix-Ldp-Resource: http://localhost:8080/fcrepo/rest/2019-09/my-file.pdf" localhost:8000/hypercube/
• Watch the lovely extracted text get blurted out onto your console.

Additional Notes:

Updated ansible role coming soon.

Interested parties

@Islandora-CLAW/committers

[whikloj]

@dannylamb you need to update all the tests as the constructor now has additional required arguments.

[dannylamb]

Kk, no prawb

[codecov]

Codecov Report

Merging #77 into dev will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev      #77      +/-   ##
============================================
+ Coverage     94.59%   94.64%   +0.05%     
- Complexity      159      160       +1     
============================================
  Files             9        9              
  Lines           647      654       +7     
============================================
+ Hits            612      619       +7     
  Misses           35       35

Impacted Files	Coverage Δ	Complexity Δ
Hypercube/src/Controller/HypercubeController.php	100% <100%> (ø)	5 <1> (+1)	⬆️

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[dannylamb]

@whikloj Travis is appeased.

[seth-shaw-unlv]