91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
package main
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import (
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"bytes"
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"encoding/base64"
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"github.com/nspcc-dev/neofs-api-go/pkg/token"
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"github.com/pkg/errors"
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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 = checkAndPropagateBearerToken(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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func fromHeader(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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func fromCookie(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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func checkAndPropagateBearerToken(ctx *fasthttp.RequestCtx) error {
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tkn, err := fetchBearerToken(ctx)
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if err != nil {
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return err
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}
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// This is an analog of context.WithValue.
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ctx.SetUserValue(bearerTokenKey, tkn)
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return nil
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}
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func fetchBearerToken(ctx *fasthttp.RequestCtx) (*token.BearerToken, 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(token.BearerToken)
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)
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for _, parse := range []fromHandler{fromHeader, fromCookie} {
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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 = errors.Wrap(err, "could not fetch marshaled from base64")
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continue
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} else if err = tkn.Unmarshal(data); err != nil {
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lastErr = errors.Wrap(err, "could not unmarshal bearer token")
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continue
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} else if tkn == nil {
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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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