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external.go
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external.go
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package jsonschema
import (
"context"
"io"
"net/http"
"net/url"
"os"
"time"
"github.com/go-faster/errors"
"go.uber.org/zap"
)
// ExternalResolver resolves external links.
type ExternalResolver interface {
Get(ctx context.Context, loc string) ([]byte, error)
}
var _ ExternalResolver = NoExternal{}
// NoExternal is ExternalResolver that always returns error.
type NoExternal struct{}
// Get implements ExternalResolver.
func (n NoExternal) Get(context.Context, string) ([]byte, error) {
return nil, errors.New("external references are disabled")
}
// ExternalOptions is external reference resolver options.
type ExternalOptions struct {
// HTTPClient sets http client to use. Defaults to http.DefaultClient.
HTTPClient *http.Client
// ReadFile sets function for reading files from fs. Defaults to os.ReadFile.
ReadFile func(p string) ([]byte, error)
// Logger sets logger to use. Defaults to zap.NewNop().
Logger *zap.Logger
}
func (r *ExternalOptions) setDefaults() {
if r.HTTPClient == nil {
r.HTTPClient = http.DefaultClient
}
if r.ReadFile == nil {
r.ReadFile = os.ReadFile
}
if r.Logger == nil {
r.Logger = zap.NewNop()
}
}
var _ ExternalResolver = externalResolver{}
type externalResolver struct {
client *http.Client
readFile func(p string) ([]byte, error)
logger *zap.Logger
}
// NewExternalResolver creates new ExternalResolver.
//
// Currently only http(s) and file schemes are supported.
func NewExternalResolver(opts ExternalOptions) ExternalResolver {
opts.setDefaults()
return externalResolver{
client: opts.HTTPClient,
readFile: opts.ReadFile,
logger: opts.Logger,
}
}
func (e externalResolver) httpGet(ctx context.Context, u *url.URL) ([]byte, error) {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
if err != nil {
return nil, errors.Wrap(err, "create request")
}
if pass, ok := u.User.Password(); ok && u.User != nil {
req.SetBasicAuth(u.User.Username(), pass)
}
start := time.Now()
resp, err := e.client.Do(req)
if err != nil {
return nil, errors.Wrap(err, "do")
}
defer func() {
if resp.Body != nil {
_ = resp.Body.Close()
}
}()
e.logger.Debug("Get",
zap.String("url", u.Redacted()),
zap.Int("status", resp.StatusCode),
zap.Duration("duration", time.Since(start)),
)
if code := resp.StatusCode; code >= 299 {
text := http.StatusText(code)
return nil, errors.Errorf("bad HTTP code %d (%s)", code, text)
}
data, err := io.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrap(err, "read data")
}
return data, nil
}
func (e externalResolver) Get(ctx context.Context, loc string) ([]byte, error) {
u, err := url.Parse(loc)
if err != nil {
return nil, err
}
var (
data []byte
scheme = u.Scheme
)
switch scheme {
case "http", "https":
data, err = e.httpGet(ctx, u)
case "file", "":
data, err = e.readFile(u.Path)
default:
return nil, errors.Errorf("unsupported scheme %q", scheme)
}
if err != nil {
if scheme == "" {
scheme = "file"
}
return nil, errors.Wrap(err, scheme)
}
return data, nil
}