Tutorial

The tutorial in this section creates a Spring Boot personal (i.e., single-user) Web service on http://localhost:8080 that uses Inrupt’s Java client library to:

• Read the Pod URLs associated with the user’s WebID.

• Store and manage expense records in the user’s Pod. The expense records are stored as Resource Description Framework (RDF) resource.

The locally-run personal Web service uses the Client Credentials flow; that is, the service logs in with its credentials on behalf of the user who registered the client.

For this part of the tutorial, an expense record (with date, description, provider, amount, currency, category information) is stored as a file in the Pod with the following structure and sample values (shown in Turtle):

<https://storage.example.com/{rootContainer}/expenses/20230306/teamLunchExpense>
    <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> &#x3C;https://schema.org/Invoice> ;
    <https://schema.org/purchaseDate>  "2023-03-07T00:00:00Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
    <https://schema.org/provider>      "Example Restaurant" ;
    <https://schema.org/description>   "Team Lunch";
    <https://schema.org/category>      "Travel and Entertainment" ;
    <https://schema.org/priceCurrency> "USD" ;
    <https://schema.org/totalPrice>    "120"^^<http://www.w3.org/2001/XMLSchema#decimal> .

• The subject and the predicates are URLs.

• The object may be URLs or literals.

Attach a receipt to the expense:

• Store the receipt (as a non-RDF .png , .pdf , or .jpeg file) to the user’s Pod.

• Update the the Expense resource by adding a link to the saved receipt file.

 <https://storage.example.com/{rootContainer}/expenses/20230306/teamLunchExpense>
     <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <https://schema.org/Invoice> ;
     <https://schema.org/purchaseDate>  "2023-03-07T00:00:00Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
     <https://schema.org/provider>      "Example Restaurant" ;
     <https://schema.org/description>   "Team Lunch";
     <https://schema.org/category>      "Travel and Entertainment" ;
     <https://schema.org/priceCurrency> "USD" ;
     <https://schema.org/totalPrice>    "120"^^<http://www.w3.org/2001/XMLSchema#decimal> ;
    <strong> <https://schema.org/image>     <https://storage.example.com/{rootContainer}/expenses/20230306/teamLunchExpense_somerandomsuffix.jpg> .