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regogo.go
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regogo.go
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package regogo
import (
"context"
"encoding/json"
"github.com/open-policy-agent/opa/rego"
)
type Regogo struct {
query string
evaluator rego.PreparedEvalQuery
}
func (rg Regogo) Get(input string) (Result, error) {
var inMap map[string]interface{}
err := json.Unmarshal([]byte(input), &inMap)
if err != nil {
return Result{}, err
}
resset, err := rg.evaluator.Eval(context.TODO(), rego.EvalInput(inMap))
if err != nil {
return Result{}, err
}
rescount := len(resset)
tmpres := make([]interface{}, rescount)
for i, res := range resset {
exp := res.Expressions
tmpres[i] = exp[len(exp)-1].Value
}
if rescount == 1 {
return Result{Value: tmpres[0]}, nil
}
return Result{Value: tmpres}, nil
}
func New(query string) (*Regogo, error) {
regoQuery, err := rego.New(
rego.Query(query),
).PrepareForEval(context.TODO())
if err != nil {
return nil, err
}
return &Regogo{query: query, evaluator: regoQuery}, nil
}
func Get(input string, query string) (Result, error) {
rg, err := New(query)
if err != nil {
return Result{}, err
}
return rg.Get(input)
}