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policy.go
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policy.go
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package policy
import (
"bytes"
"net/http"
"text/template"
"github.com/gorilla/mux"
"github.com/replicatedhq/kots/pkg/store"
)
type VarsGetter func(kotsStore store.Store, vars map[string]string) (map[string]string, error)
type Policy struct {
action string
resource string
resourceTemplate *template.Template
varsGetterFns []VarsGetter
}
func NewPolicy(action, resource string, fns ...VarsGetter) (policy *Policy, err error) {
policy = &Policy{action: action, resource: resource, varsGetterFns: fns}
policy.resourceTemplate, err = template.New(resource).Option("missingkey=error").Parse(resource)
return
}
func Must(p *Policy, err error) *Policy {
if err != nil {
panic(err)
}
return p
}
func (p *Policy) execute(r *http.Request, kotsStore store.Store) (action, resource string, err error) {
vars := mux.Vars(r)
for _, fn := range p.varsGetterFns {
additionalVars, err := fn(kotsStore, vars)
if err != nil {
return action, resource, err
}
for key, val := range additionalVars {
vars[key] = val
}
}
var buf bytes.Buffer
err = p.resourceTemplate.Execute(&buf, vars)
return p.action, buf.String(), err
}