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