LinkedPipes DCAT-AP Forms

DCAT-AP v3.0 and DCAT-AP HVD compatible web form producing JSON-LD, primarily intended for the Czech National Open Data catalog.

Requirements

Node.js (tested on 22.9) and npm
Apache Solr (tested on 8.11.1)

Installation

Solr

Install Solr. It is expected that Solr runs on localhost, port 8983.

Create cores:

solr.cmd create -c iana-media-types
solr.cmd create -c mdr-file-type
solr.cmd create -c ruian
solr.cmd create -c eurovoc
solr.cmd create -c places
solr.cmd create -c countries
solr.cmd create -c continents
solr.cmd create -c frequencies
solr.cmd create -c dataset-themes

Set core properties:

curl http://localhost:8983/solr/iana-media-types/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/mdr-file-type/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/ruian/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/eurovoc/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/places/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/countries/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/continents/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/frequencies/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

curl http://localhost:8983/solr/dataset-themes/config -H 'Content-type:application/json' -d '{
    "set-user-property": {"update.autoCreateFields":"false"},
    "set-property" : {"requestDispatcher.requestParsers.enableRemoteStreaming":true},
    "set-property" : {"requestDispatcher.requestParsers.enableStreamBody":true}
}'

Create schema:

curl http://localhost:8983/solr/iana-media-types/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [{"class":"solr.LowerCaseFilterFactory"}]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "text" , "indexed": true, "docValues": false},
    "add-field": {"name": "priority", "type": "pint" , "indexed": true, "docValues": true}
}'

curl http://localhost:8983/solr/mdr-file-type/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [{"class":"solr.LowerCaseFilterFactory"}]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "text" , "indexed": true, "docValues": false},
    "add-field": {"name": "priority", "type": "pint" , "indexed": true, "docValues": true}
}'

curl http://localhost:8983/solr/ruian/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "notation", "type": "string" , "indexed": false, "docValues": false},
    "add-field": {"name": "type", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

curl http://localhost:8983/solr/eurovoc/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "notation", "type": "string" , "indexed": false, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

curl http://localhost:8983/solr/places/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "type", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

curl http://localhost:8983/solr/countries/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "type", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

curl http://localhost:8983/solr/continents/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "type", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

curl http://localhost:8983/solr/frequencies/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "type", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

curl http://localhost:8983/solr/dataset-themes/schema -X POST -H 'Content-type:application/json' --data-binary '{
    "add-field-type": {"name": "ascii_text", "class": "solr.TextField", "positionIncrementGap": "100", "analyzer": {
        "tokenizer": {"class":"solr.WhitespaceTokenizerFactory"},
        "filters": [
            {"class":"solr.LowerCaseFilterFactory"},
            {"class":"solr.ASCIIFoldingFilterFactory"}
        ]
    }},
    "add-field": {"name": "code", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "type", "type": "string" , "indexed": true, "docValues": false},
    "add-field": {"name": "cs", "type": "ascii_text" , "indexed": true, "docValues": false},
    "add-field": {"name": "en", "type": "ascii_text" , "indexed": true, "docValues": false},
}'

DCAT-AP Forms

Install dependencies

npm install

Custom configuration, can be provided using Javascript configuration file. Copy and edit the sample:

cp configuration.js my-configuration.js

The path to the custom file can be set using program argument ie.

npm run build -- --env configFileLocation=./my-configuration.js
npm run start -- --env configFileLocation=./my-configuration.js

where the argument is relative path from the project root, or absolute path. It's necessary to provide absolute path or start the path with ./. Another way is to set environment property dcatApFormsConfig.

The following custom configuration file set the port to 1111:

module.exports = {
    "port": 1111,
    "nkod_databox": "
};

For more information about the configuration properties please refer to ./configuration.js file and a variable defaultConfiguration.

Integration

DCAT-AP Forms can be integrated with external systems by

using POST request to prefill the forms.
using returnUrl URL query argument to POST content of the form as a submit action.

Prefill forms using POST

This functionality is supported for dataset delete and dataset edit. For both endpoints we can POST JSON-LD dataset using formData field with application/x-www-form-urlencoded content type.

An example of the post data may look like this:

{
  "@type":"http://www.w3.org/ns/dcat#Dataset",
  "@id":"http://dataset-to-be-removed",
  "http://purl.org/dc/terms/title": {"@value": "Dataset name", "@lang": "cs"},
  "http://purl.org/dc/terms/description": {"@value": "Dataset description", "@lang": "cs"}
}

In fact, we can fill in the dataset edit form manually. Download the content as a file and post it to the form, to prefill the form.

Let us demonstrate using exampel and dataset delete. We can post the data to ./odstranění-datové-sady or ./dataset-withdrawn for Czech or English version respectively using following command:

curl -d data="{\"@type\":\"http://www.w3.org/ns/dcat#Dataset\", \"@id\":\"http://dataset-to-be-removed\",\"http://purl.org/dc/terms/title\":{\"@value\":\"Dataset name\",\"@lang\":\"cs\"},\"http://purl.org/dc/terms/description\":{\"@value\":\"Dataset description\",\"@lang\":\"cs\"}}" http://localhost:8057/odstranění-datové-sady

In the HTML response we can see window.serverPostData set to the posted content. The client will load this data in a same way as when importing from URL.

While the simple example above is suficient for dataset delete, as only basic information is utilized, you may need to provide more information when using dataset edit available at ./registrace-datové-sady or ./dataset-registration.

Using returnUrl to POST data to URL of choice

If you provide returnUrl query argument with an URL, the last step of the form will POST the data to given URL instead of download. The request is using application/x-www-form-urlencoded content type with the formData data field.

We can even create a nice loop, using following URL ./registrace-datové-sady?returnUrl=./odstranění-datové-sady. In this case user is navigated to an empty registration form. Once the form is filled, user can submit the form using POST to the dataset delete form.

Name		Name	Last commit message	Last commit date
Latest commit History 648 Commits
build		build
client		client
lp-etl		lp-etl
public/assets		public/assets
server		server
.eslintrc.js		.eslintrc.js
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
babel.config.js		babel.config.js
configuration.js		configuration.js
jest.config.js		jest.config.js
package-lock.json		package-lock.json
package.json		package.json

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LinkedPipes DCAT-AP Forms

Requirements

Installation

Solr

DCAT-AP Forms

Integration

Prefill forms using POST

Using returnUrl to POST data to URL of choice

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LinkedPipes DCAT-AP Forms

Requirements

Installation

Solr

DCAT-AP Forms

Integration

Prefill forms using POST

Using returnUrl to POST data to URL of choice

About

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