WoT Lib

This lib was created to simplify working with WoT Thing Descriptions. It is coupled to W3C's recommendation from 9 April 2020 (https://www.w3.org/TR/2020/REC-wot-thing-description-20200409/) which means it assumes a certain structure. So far only a subset of the fields are implemented.

Working principle

Read Thing Description -> Expand -> Perform operations

Capabilities

• Determine if a thing and its sub elements do match with certain criteria
• Search for property affordances with specific constraints
• Search for action affordances with specific constraints

Example

The following example reads a td from bytes and retrieves all property affordances that match a given criteria

// Define additionally used schema
var iotSchema = wotlib.SchemaMapping{
    Prefix: wotlib.SchemaPrefix("iot"),
    IRI:    "http://iotschema.org/",
}

// Append it so its used during compaction
wotlib.AppendSchema(iotSchema)

expandedTD, err := wotlib.FromBytes(input)
if err != nil {
    panic(err)
}

// Retrieve all property affordances that match given criteria
props := expandedTD.GetPropertyAffordances(wotlib.PropertyConstraint{
    Type: &[]string{iotSchema.IRIPrefix("SwitchStatus")},
})

// Prints the href of the first match
fmt.Printf("Result: %s", props[0].Form.Value().Href.Value())

In case multiple Thing Descriptions have to be processed append them to a set and apply the operation

set := wotlib.NewExpandedThingDescriptionSet(expandedTD)
set.GetActionAffordances(thingConstraint)