Knowledge Hub

Knowledge Hub is a semantic search application for enterprise knowledge based on a enterprise knowledge graph. It consists of 2 parts:

1. KHub Builder - a pipeline for automatic construction of knowledge graphs based on Apache Jena framework
2. KHub Explorer - an overlay search application for interacting with Apache Fuseki via full-text search

Enterprise knowledge includes company internal data distributed across multiple platforms such as Atlassian Confluence, Microsoft SharePoint/Teams, Slack, Notion, etc. This data is present in form of messages, Wiki pages, documents and can be integrated in one common system for searching, analyzing and other purposes.

Requirements

1. Java SE 17 or higher
2. Docker (Desktop / Engine) with Docker Engine 19.03.0 or higher

How to Run

1. Create Access Token(s):
   • Confluence API Token (see link). The token is connected to an account and has the form me@example.com:my-api-token. For crawling open Confluence groups no token is required, use null as confluence.token.
   • Microsoft Graph API Token (see link). The app must be registered in Azure AD. The user needs to be member of all MS Teams that should be processed. The following permissions are also required:
     • Team.ReadBasic.All
     • Channel.ReadBasic.All
     • ChannelMessage.Read.All
2. Fill in the confluence.endpoint, confluence.token and teams.token in the KHub Builder configuration file. For Confluence Cloud use https://your-domain.atlassian.net/wiki/, for Confluence Server - http://your-domain.com/, the application will prepend the second part of the endpoint starting with rest/api/.... Use tokens from 1. or null for sending crawling requests without authentication header. Make other configuration adjustments if needed.
3. (Optional) Define queries and mapping files for additional knowledge extraction, see examples in Knowledge Graph Enriching.
4. Build the Docker images manually with docker-compose build from resources folder, otherwise some pipeline steps might fail or get stuck and will need to be rerun.
5. Run the pipeline completely or only its separate steps with java -jar khub-builder.jar, see additional commands with --help. After successful run, several named graphs are constructed and saved in Jena TDB in the directory configured in tdb.path.
6. Run start-khub-explorer.bat or docker-compose up in the explorer directory for starting Jena.TextIndexer, Fuseki Server and KHub Explorer. If needed, Fuseki assembler file and docker-compose.yaml can be modified. The KHub Explorer will start locally allowing full-text search on the constructed knowledge graph.

Dependencies

Dependency	Version	License
Apache Maven	3.9.0	Apache 2.0
Apache Jena	4.7.0	Apache 2.0
Bootstrap	5.2.3	MIT
Google Gson	2.10.1	Apache 2.0
Jsoup	1.15.3	MIT
MongoDB	latest-image	License
MongoDB Java Driver	3.12.11	Apache 2.0
React	18.2.0	MIT
React Bootstrap	2.7.2	MIT
React Scripts	5.0.1	MIT
RML Mapper	latest-image	MIT