/
resource_lister.go
77 lines (65 loc) · 2.32 KB
/
resource_lister.go
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package server
import (
"fmt"
"io"
"net/http"
"net/url"
"github.com/devops-simba/console/pkg/serverutils"
)
// ResourceLister handles resource requests
type ResourceLister interface {
HandleResources(w http.ResponseWriter, r *http.Request)
}
// FilterFunction shall filter response before propagating
type FilterFunction func(http.ResponseWriter, *http.Response)
// resourceLister determines the list of resources of a particular kind
type resourceLister struct {
bearerToken string
requestURL *url.URL
client *http.Client
responseFilter FilterFunction
}
//HandleResources handles resource requests
func (l *resourceLister) HandleResources(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
serverutils.SendResponse(w, http.StatusMethodNotAllowed, serverutils.ApiError{Err: "invalid method: only GET is allowed"})
return
}
req, err := http.NewRequest("GET", l.requestURL.String(), nil)
if err != nil {
serverutils.SendResponse(w, http.StatusInternalServerError, serverutils.ApiError{Err: fmt.Sprintf("failed to create GET request: %v", err)})
return
}
req.Header.Set("Authorization", "Bearer "+l.bearerToken)
resp, err := l.client.Do(req)
if err != nil {
serverutils.SendResponse(w, http.StatusBadGateway, serverutils.ApiError{Err: fmt.Sprintf("GET request failed: %v", err)})
return
}
if resp.StatusCode != http.StatusOK {
err := fmt.Errorf("console service account cannot list resource: %s", resp.Status)
serverutils.SendResponse(w, resp.StatusCode, serverutils.ApiError{Err: err.Error()})
return
}
w.WriteHeader(resp.StatusCode)
l.responseFilter(w, resp)
resp.Body.Close()
}
// NewResourceLister shall instantiate & return resourceLister instance
func NewResourceLister(bearerToken string, requestURL *url.URL, client *http.Client, respFilter FilterFunction) ResourceLister {
r := &resourceLister{
bearerToken: bearerToken,
requestURL: requestURL,
client: client,
responseFilter: respFilter,
}
if r.responseFilter == nil {
r.responseFilter = func(w http.ResponseWriter, r *http.Response) {
if _, err := io.Copy(w, r.Body); err != nil {
plog.Errorf("console service account cannot list resource: %s", err)
serverutils.SendResponse(w.(http.ResponseWriter), http.StatusInternalServerError, serverutils.ApiError{Err: err.Error()})
}
}
}
return r
}