go-sample-webpage/vendor/github.com/lestrrat-go/jwx/jws/headers.go
2021-11-04 02:14:51 +01:00

70 lines
1.8 KiB
Go

package jws
import (
"context"
"github.com/lestrrat-go/iter/mapiter"
"github.com/lestrrat-go/jwx/internal/iter"
"github.com/pkg/errors"
)
// Iterate returns a channel that successively returns all the
// header name and values.
func (h *stdHeaders) Iterate(ctx context.Context) Iterator {
pairs := h.makePairs()
ch := make(chan *HeaderPair, len(pairs))
go func(ctx context.Context, ch chan *HeaderPair, pairs []*HeaderPair) {
defer close(ch)
for _, pair := range pairs {
select {
case <-ctx.Done():
return
case ch <- pair:
}
}
}(ctx, ch, pairs)
return mapiter.New(ch)
}
func (h *stdHeaders) Walk(ctx context.Context, visitor Visitor) error {
return iter.WalkMap(ctx, h, visitor)
}
func (h *stdHeaders) AsMap(ctx context.Context) (map[string]interface{}, error) {
return iter.AsMap(ctx, h)
}
func (h *stdHeaders) Copy(ctx context.Context, dst Headers) error {
for iter := h.Iterate(ctx); iter.Next(ctx); {
pair := iter.Pair()
if err := dst.Set(pair.Key.(string), pair.Value); err != nil {
return errors.Wrapf(err, `failed to set header`)
}
}
return nil
}
// mergeHeaders merges two headers, and works even if the first Header
// object is nil. This is not exported because ATM it felt like this
// function is not frequently used, and MergeHeaders seemed a clunky name
func mergeHeaders(ctx context.Context, h1, h2 Headers) (Headers, error) {
h3 := NewHeaders()
if h1 != nil {
if err := h1.Copy(ctx, h3); err != nil {
return nil, errors.Wrap(err, `failed to copy headers from first Header`)
}
}
if h2 != nil {
if err := h2.Copy(ctx, h3); err != nil {
return nil, errors.Wrap(err, `failed to copy headers from second Header`)
}
}
return h3, nil
}
func (h *stdHeaders) Merge(ctx context.Context, h2 Headers) (Headers, error) {
return mergeHeaders(ctx, h, h2)
}