frostfs-http-gw/tokens/bearer-token.go

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package tokens
import (
"bytes"
"context"
"encoding/base64"
"errors"
"fmt"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
"github.com/valyala/fasthttp"
)
type fromHandler = func(h *fasthttp.RequestHeader) []byte
const (
bearerTokenHdr = "Bearer"
bearerTokenKey = "__context_bearer_token_key"
)
// BearerToken usage:
//
// if err = storeBearerToken(ctx); err != nil {
// log.Error("could not fetch bearer token", zap.Error(err))
// c.Error("could not fetch bearer token", fasthttp.StatusBadRequest)
// return
// }
// BearerTokenFromHeader extracts a bearer token from Authorization request header.
func BearerTokenFromHeader(h *fasthttp.RequestHeader) []byte {
auth := h.Peek(fasthttp.HeaderAuthorization)
if auth == nil || !bytes.HasPrefix(auth, []byte(bearerTokenHdr)) {
return nil
}
if auth = bytes.TrimPrefix(auth, []byte(bearerTokenHdr+" ")); len(auth) == 0 {
return nil
}
return auth
}
// BearerTokenFromCookie extracts a bearer token from cookies.
func BearerTokenFromCookie(h *fasthttp.RequestHeader) []byte {
auth := h.Cookie(bearerTokenHdr)
if len(auth) == 0 {
return nil
}
return auth
}
// StoreBearerTokenAppCtx extracts a bearer token from the header or cookie and stores
// it in the application context.
func StoreBearerTokenAppCtx(ctx *fasthttp.RequestCtx, appCtx context.Context) (context.Context, error) {
tkn, err := fetchBearerToken(ctx)
if err != nil {
return nil, err
}
newCtx := context.WithValue(appCtx, bearerTokenKey, tkn)
return newCtx, nil
}
// LoadBearerToken returns a bearer token stored in the context given (if it's
// present there).
func LoadBearerToken(ctx context.Context) (*bearer.Token, error) {
if tkn, ok := ctx.Value(bearerTokenKey).(*bearer.Token); ok && tkn != nil {
return tkn, nil
}
return nil, errors.New("found empty bearer token")
}
func fetchBearerToken(ctx *fasthttp.RequestCtx) (*bearer.Token, error) {
// ignore empty value
if ctx == nil {
return nil, nil
}
var (
lastErr error
buf []byte
tkn = new(bearer.Token)
)
for _, parse := range []fromHandler{BearerTokenFromHeader, BearerTokenFromCookie} {
if buf = parse(&ctx.Request.Header); buf == nil {
continue
} else if data, err := base64.StdEncoding.DecodeString(string(buf)); err != nil {
lastErr = fmt.Errorf("can't base64-decode bearer token: %w", err)
continue
} else if err = tkn.Unmarshal(data); err != nil {
lastErr = fmt.Errorf("can't unmarshal bearer token: %w", err)
continue
}
return tkn, nil
}
return nil, lastErr
}