QWC Print service

API documentation:

http://localhost:5019/api/

Configuration

The static config files are stored as JSON files in $CONFIG_PATH with subdirectories for each tenant, e.g. $CONFIG_PATH/default/*.json. The default tenant name is default.

JSON config

• JSON schema
• File location: $CONFIG_PATH/<tenant>/printConfig.json

Example:

{
  "$schema": "https://raw.githubusercontent.com/qwc-services/qwc-print-service/master/schemas/qwc-print-service.json",
  "service": "print",
  "config": {
    "ogc_service_url": "http://localhost:5013/ows/",
    "qgis_server_version": "3.4.1",
    "print_pdf_filename": "qwc.pdf",
    "label_queries": [
      {
        "db_url": "postgresql:///?service=fachdaten",
        "query": "SELECT 'Bearbeiter/in: ' ||  vorname || ' ' || nachname FROM benutzer WHERE username = $username$",
        "params": [
          "NAME"
        ]
      }
    ],
    "label_values": [
      {
        "field": "USERNAME",
        "value": "$username$"
      }
    ]
  },
  "resources": {
    "print_templates": [
      {
        "template": "A4 hoch"
      }
    ]
  }
}

label_queries is a configuration for additional query parameters to inject into the WMS GetPrint request.

The contents is expected to be

{
  "label_queries": [{
    "db_url": "<db_url>",
    "query": "<query>",
    "params": ["<ParamName1>", ...]
  },{
    ...
  }],
}

where:

• query is an arbitrary query, returning exactly one row. The $username$ placeholder can be used to inject the current username.
• params is an array of parameter names to inject. The same number of parameters as number of returned values by the query must be specified.

Environment variables

Config options in the config file can be overridden by equivalent uppercase environment variables.

Variable	Description
OGC_SERVICE_URL	OGC Service URL
QGIS_SERVER_VERSION	QGIS Server version (e.g. 2.18.19, 3.4.1)

Development

Create a virtual environment:

python3 -m venv .venv

Activate virtual environment:

source .venv/bin/activate

Install requirements:

pip install -r requirements.txt

Set the CONFIG_PATH environment variable to the path containing the service config and permission files when starting this service (default: config).

export CONFIG_PATH=../qwc-docker/volumes/config

Configure environment:

echo FLASK_ENV=development >.flaskenv

Start local service:

python src/server.py