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access.go
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access.go
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package wget
import (
gocontext "context"
"crypto/tls"
"encoding/base64"
"io"
"mime"
"net/http"
"github.com/mandelsoft/goutils/errors"
"github.com/open-component-model/ocm/pkg/blobaccess"
"github.com/open-component-model/ocm/pkg/blobaccess/bpi"
"github.com/open-component-model/ocm/pkg/contexts/credentials"
"github.com/open-component-model/ocm/pkg/contexts/credentials/builtin/wget/identity"
"github.com/open-component-model/ocm/pkg/contexts/ocm/cpi"
ocmmime "github.com/open-component-model/ocm/pkg/mime"
"github.com/open-component-model/ocm/pkg/mimeutils"
"github.com/open-component-model/ocm/pkg/optionutils"
"github.com/open-component-model/ocm/pkg/utils"
)
const (
CACHE_CONTENT_THRESHOLD = 4096
)
func DataAccessForWget(url string, opts ...Option) (blobaccess.DataAccess, error) {
blobAccess, err := BlobAccessForWget(url, opts...)
if err != nil {
return nil, err
}
return blobAccess, nil
}
func BlobAccessForWget(url string, opts ...Option) (_ blobaccess.BlobAccess, rerr error) {
eff := optionutils.EvalOptions(opts...)
log := eff.Logger("URL", url)
creds, err := eff.GetCredentials(url)
if err != nil {
return nil, err
}
if creds == nil {
log.Debug("no credentials found for url {{url}}", "url", url)
}
// configure http client
rootCAs, err := credentials.GetRootCAs(eff.CredentialContext, creds)
if rerr != nil {
return nil, err
}
clientCerts, err := credentials.GetClientCerts(eff.CredentialContext, creds)
if err != nil {
return nil, errors.New("client certificate and private key provided in credentials could not be loaded " +
"as tls certificate")
}
transport := &http.Transport{
TLSClientConfig: &tls.Config{
MinVersion: tls.VersionTLS13,
RootCAs: rootCAs,
Certificates: clientCerts,
},
}
var redirectFunc func(req *http.Request, via []*http.Request) error = nil
if eff.NoRedirect != nil && *eff.NoRedirect {
redirectFunc = func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
}
}
client := &http.Client{
CheckRedirect: redirectFunc,
Transport: transport,
}
if eff.Verb == "" {
eff.Verb = http.MethodGet
}
// configure http request
request, err := http.NewRequestWithContext(gocontext.Background(), eff.Verb, url, eff.Body)
if err != nil {
return nil, err
}
if eff.Header != nil {
for key, arr := range eff.Header {
for _, el := range arr {
request.Header.Add(key, el)
}
}
}
if creds != nil {
user := creds.GetProperty(identity.ATTR_USERNAME)
password := creds.GetProperty(identity.ATTR_PASSWORD)
token := creds.GetProperty(identity.ATTR_IDENTITY_TOKEN)
if user != "" && password != "" {
auth := user + ":" + password
auth = base64.StdEncoding.EncodeToString([]byte(auth))
request.Header.Add("Authorization", "Basic "+auth)
} else if token != "" {
request.Header.Add("Authorization", "Bearer "+token)
}
}
// make http request
resp, err := client.Do(request)
if err != nil {
return nil, err
}
defer errors.PropagateError(&rerr, resp.Body.Close)
log.Debug("http status code {{code}}", "code", resp.StatusCode)
// determine effective mime type
if eff.MimeType == "" {
log.Debug("no mime type provided as option, trying to extract mime type from content type " +
"response header")
contentType := resp.Header.Get("Content-Type")
eff.MimeType, _, err = mime.ParseMediaType(contentType)
if err != nil {
log.Debug("failed to get mime type from content type response header with error {{err}}",
"err", err)
}
}
if eff.MimeType == "" {
log.Debug("no mime type was provided as content type header of the http response, trying to" +
"extract mime type from url")
ext, err := utils.GetFileExtensionFromUrl(url)
if err == nil && ext != "" {
eff.MimeType = mimeutils.TypeByExtension(ext)
} else if err != nil {
log.Debug(err.Error())
}
}
if eff.MimeType == "" {
eff.MimeType = ocmmime.MIME_OCTET
log.Debug("no mime type could be extract from the url, defaulting to {{default}}", "default",
eff.MimeType)
}
// download content
var blob cpi.BlobAccess
if resp.ContentLength < 0 || resp.ContentLength > CACHE_CONTENT_THRESHOLD {
log.Debug("download to file because content length is unknown or greater than {{threshold}}", "threshold", CACHE_CONTENT_THRESHOLD)
f, err := blobaccess.NewTempFile("", "wget")
if err != nil {
return nil, err
}
defer errors.PropagateError(&rerr, f.Close)
n, err := io.Copy(f.Writer(), resp.Body)
if err != nil {
return nil, err
}
log.Debug("downloaded size {{size}} to {{filepath}}", "size", n, "filepath", f.Name())
blob = f.AsBlob(eff.MimeType)
} else {
log.Debug("download to memory because content length is less than {{threshold}}", "threshold", CACHE_CONTENT_THRESHOLD)
buf, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
blob = blobaccess.ForData(eff.MimeType, buf)
}
return blob, nil
}
func BlobAccessProviderForWget(url string, opts ...Option) bpi.BlobAccessProvider {
return bpi.BlobAccessProviderFunction(func() (bpi.BlobAccess, error) {
b, err := BlobAccessForWget(url, opts...)
return b, err
})
}