103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package client
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import (
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"bytes"
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"compress/gzip"
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"context"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strings"
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"time"
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"netisjwt/internal/jws"
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)
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// PridobiInPreveriStatus poklice GET endpoint, preveri JWS in vrne status.
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func PridobiInPreveriStatus(ctx context.Context, targetURL string) (bool, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, targetURL, nil)
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if err != nil {
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return false, err
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return false, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return false, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
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}
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rawToken, err := io.ReadAll(resp.Body)
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if err != nil {
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return false, err
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}
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token := strings.TrimSpace(string(rawToken))
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claims, err := jws.PreveriZeton(token)
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if err != nil {
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return false, err
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}
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if err := jws.PreveriTrditve(claims, izdajateljIzURL(targetURL), time.Now()); err != nil {
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return false, err
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}
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values, err := dekodirajKodiranSeznam(claims.Status.EncodedList)
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if err != nil {
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return false, err
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}
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return preberiBit(values, claims.Status.Index)
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}
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// izdajateljIzURL vrne url brez zadnjega segmenta index.
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func izdajateljIzURL(url string) string {
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parts := strings.Split(url, "/")
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if len(parts) < 5 {
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return ""
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}
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return strings.Join(parts[:len(parts)-1], "/")
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}
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// dekodirajKodiranSeznam pretvori base64+gzip seznam v surove bajte.
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func dekodirajKodiranSeznam(encoded string) ([]byte, error) {
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compressed, err := base64.StdEncoding.DecodeString(encoded)
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if err != nil {
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return nil, err
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}
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reader, err := newGzipBralnik(compressed)
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if err != nil {
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return nil, err
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}
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defer reader.Close()
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return io.ReadAll(reader)
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}
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// preberiBit prebere en bit iz podanega bajtnega zaporedja.
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func preberiBit(data []byte, index int) (bool, error) {
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if index < 0 {
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return false, errors.New("index must be >= 0")
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}
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byteIdx := index / 8
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if byteIdx >= len(data) {
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return false, errors.New("index is out of encoded list range")
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}
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mask := byte(1 << (index % 8))
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return data[byteIdx]&mask != 0, nil
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}
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type gzipReader interface {
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io.Reader
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Close() error
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}
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// newGzipBralnik ustvari gzip reader iz podanih bajtov.
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func newGzipBralnik(input []byte) (gzipReader, error) {
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return gzip.NewReader(bytes.NewReader(input))
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}
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