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The low-code Knowledge Graph application platform. Apache license.
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AtomGraph/LinkedDataHub
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LinkedDataHub (LDH) is an open source software you can use to manage data, create visualizations and build apps on RDF Knowledge Graphs.
Welcome to LinkedDataHub. We started the project with the intention to use it for Linked Data publishing, but gradually realized that we've built a multi-purpose data-driven platform.
We are building LinkedDataHub for:
- domain experts who work with RDF data and need an accessible low-code publishing, exploration and management tool
- developers who are looking for a declarative full stack framework for web application and API development
- data engineers who need an open-source RDF platform that can be customized for a variety of use cases
What makes LinkedDataHub unique is its completelydata-driven architecture: applications and documents are defined as data, managed using a single generic HTTP API and presented using declarative technologies. The default application structure and user interface are provided, but they can be completely overridden and customized. Unless a custom server-side processing is required, no imperative code such as Java or JavaScript needs to be involved at all.
Follow theGet started guide to build your first application on LinkedDataHub. The setup and basic configuration sections are provided below and should get you running.
Click to expand
- Have your
bashshell ready. It should be included by default on Linux. On Windows you can install theWindows Subsystem for Linux. - Install Docker
- Install Docker Compose, if it is not already included in the Docker installation
- Fork this repository and clone the fork into a folder
- In the folder, create an
.envfile and fill out the missing values (you can use.env_sampleas a template). For example:COMPOSE_CONVERT_WINDOWS_PATHS=1COMPOSE_PROJECT_NAME=linkeddatahubPROTOCOL=httpsPROXY_HTTP_PORT=81PROXY_HTTPS_PORT=4443HOST=localhostABS_PATH=/OWNER_MBOX=john@doe.comOWNER_GIVEN_NAME=JohnOWNER_FAMILY_NAME=DoeOWNER_ORG_UNIT=My unitOWNER_ORGANIZATION=My orgOWNER_LOCALITY=CopenhagenOWNER_STATE_OR_PROVINCE=DenmarkOWNER_COUNTRY_NAME=DK - Setup SSL certificates/keys by running this from command line (replace
$owner_cert_pwdand$secretary_cert_pwdwith your own passwords):The script will create an./scripts/setup.sh .env ssl $owner_cert_pwd $secretary_cert_pwd 3650sslsub-folder where the SSL certificates and/or public keys will be placed. It requires Java'skeytoolas well asopensslto be available on$PATH. - Launch the application services by running this from command line:LinkedDataHub will start and mount the following sub-folders:
docker-compose updatawhere the triplestore(s) will persist RDF datauploadswhere LDH stores content-hashed file uploadsThe first should take around half a minute as datasets are being loaded into triplestores. After a successful startup, the last line of the Docker log should read something like:
linkeddatahub_1 | 09-Feb-2021 14:18:10.536 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in [32609] milliseconds - Install
ssl/owner/keystore.p12into a web browser of your choice (password is the$owner_cert_pwdvalue supplied tosetup.sh)- Google Chrome:
Settings > Advanced > Manage Certificates > Import... - Mozilla Firefox:
Options > Privacy > Security > View Certificates... > Import... - Apple Safari: The file is installed directly into the operating system. Open the file and import it using theKeychain Access tool.
- Microsoft Edge: Does not support certificate management, you need to install the file into Windows.Read more here.
- Google Chrome:
- Openhttps://localhost:4443/ in that web browser
- You will likely get a browser warning such as
Your connection is not privatein Chrome orWarning: Potential Security Risk Aheadin Firefox due to the self-signed server certificate. Ignore it: clickAdvancedandProceedorAccept the riskto proceed.- If this option does not appear in Chrome (as observed on some MacOS), you can open
chrome://flags/#allow-insecure-localhost, switchAllow invalid certificates for resources loaded from localhosttoEnabledand restart Chrome
- If this option does not appear in Chrome (as observed on some MacOS), you can open
.env_sampleand.envfiles might be invisible in MacOS Finder which hides filenames starting with a dot. You should be able tocreate it using Terminal however.- On Linux your user may need to be a member of the
dockergroup. Add it using
sudo usermod -aG docker ${USER}and re-login with your user. An alternative, but not recommended, is to run
sudo docker-compose upClick to expand
Besides owner WebID configuration, the most common case is changing the base URI from the defaulthttps://localhost:4443/ to your own.
Lets usehttps://ec2-54-235-229-141.compute-1.amazonaws.com/linkeddatahub/ as an example. We need to split the URI into components and set them in the.env file using the following parameters:
PROTOCOL=httpsHTTP_PORT=80HTTPS_PORT=443HOST=ec2-54-235-229-141.compute-1.amazonaws.comABS_PATH=/linkeddatahub/ABS_PATH is required, even if it's just/.
Dataspaces are configured inconfig/system.trig. Relative URIs will be resolved against the base URI configured in the.env file.
urn: URI scheme, since LinkedDataHub application resources are not accessible under their own dataspace.
If you need to start fresh and wipe the existing setup (e.g. after configuring a new base URI), you can do that using
sudo rm -rf data && docker-compose down -vLinkedDataHub CLI wraps the HTTP API into a set of shell scripts with convenient parameters. The scripts can be used for testing, automation, scheduled execution and such. It is usually much quicker to perform actions using CLI rather than the user interface, as well as easier to reproduce.
The scripts can be found in thescripts subfolder.
An environment variableJENA_HOME is used by all the command line tools to configure the class path automatically for you. You can set this up as follows:
On Linux / Mac
export JENA_HOME=the directory you downloaded Jena toexport PATH="$PATH:$JENA_HOME/bin"Get thesource codeSCRIPT_ROOT environmental variable to thescripts subfolder of your LinkedDataHub fork or clone. For example:
export SCRIPT_ROOT="/c/Users/namedgraph/WebRoot/AtomGraph/LinkedDataHub/scripts"- contribute a new LDH application or modifyone of ours
- work ongood first issues
- work on the features in ourRoadmap
- join ourcommunity
LinkedDataHub includes an HTTPtest suite. The server implementation is also covered by theProcessor test suite.
Pleasereport issues if you've encountered a bug or have a feature request.
Commercial consulting, development, and support are available fromAtomGraph.
- linkeddatahub@groups.io (mailing list)
- @atomgraphhq on Twitter
- AtomGraph on LinkedIn
- W3CDeclarative Linked Data Apps Community Group
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