#---
# Setup
#---

Assuming you have been through setting up:

    cd ext-cli/
    ./get-selfcontained-python3.sh

Then to setup this extension then all you need to do is:

    pip install --upgrade google-cloud-vision

To enable the Google Vision API, set up a key etc, see:

    https://cloud.google.com/vision/docs/setup


When you create a key, your browsesr downloads a JSON version of the key.


#---
# Using the Extension
#---

The extension provides the GoogleVisionImagePlugin, for use in collections.


Small workaround needed if checked out in the GS3 extension area:

    export GSDL3EXTS=$GSDL3EXTS:structured-image


Example use of the plugin:

    <plugin name="GoogleVisionImagePlugin">
      <option name="-enable_document_ocr"/>
      <option name="-enable_image_labelling"/>
    </plugin>

The plugin currently has a hard-wired filename for the Google
service key.  This need's to be in the collection's 'etc'
directory as follows:

    etc/my-google-service-account-key.json


For the 'atea-storage' Google Cloud Project, for example, a redacted version of
the JSON key file looks like:

{
  "type": "service_account",
  "project_id": "atea-storage",
  "private_key_id": "7bc843de4257da515193eaa5b60468fcab5b3948",
  "private_key": "-----BEGIN PRIVATE KEY-----\n???????.........??????=\n-----END PRIVATE KEY-----\n",
  "client_email": "service-account@atea-storage.iam.gserviceaccount.com",
  "client_id": "123???...????",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/service-account%40atea-storage.iam.gserviceaccount.com"
}



=========

Deprecated

#====
# Getting the extension
#====

Assuming you are in the Greenstone3 top-level (i.e. GSDL3SRCHOME) directory,
(if not already done so) this extension can be checked out as follows:

  svn co https://svn.greenstone.org/gs3-extensions/structured-image/trunk ext/structured-image

Note that the plugin this extension introduces makes use of a Google Service Account and requires credentials. For more details, visit: https://cloud.google.com/vision/docs/setup.


#====
# Compiling the extension
#====

#-<>
#  <One-time-only>
#--

cd ext/structured-image
./CREATE-VENV-PYTHON3.sh
cd ../..

ln -s ext/structured-image/SETUP-TOP-LEVEL.sh SETUP.sh
ln -s ext/structured-image/DEVEL-TOP-LEVEL.sh DEVEL.sh

# If your python does not already have Google Cloud Vision
source ./SETUP.sh
pip install --upgrade google-cloud-vision

#--
#  </One-time-only>
#</>