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fetch_metadata.go
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fetch_metadata.go
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package samlsp
import (
"bytes"
"context"
"encoding/xml"
"errors"
"io/ioutil"
"net/http"
"net/url"
"github.com/crewjam/httperr"
xrv "github.com/mattermost/xml-roundtrip-validator"
"github.com/wangli1030/saml"
)
// ParseMetadata parses arbitrary SAML IDP metadata.
//
// Note: this is needed because IDP metadata is sometimes wrapped in
// an <EntitiesDescriptor>, and sometimes the top level element is an
// <EntityDescriptor>.
func ParseMetadata(data []byte) (*saml.EntityDescriptor, error) {
entity := &saml.EntityDescriptor{}
if err := xrv.Validate(bytes.NewBuffer(data)); err != nil {
return nil, err
}
err := xml.Unmarshal(data, entity)
// this comparison is ugly, but it is how the error is generated in encoding/xml
if err != nil && err.Error() == "expected element type <EntityDescriptor> but have <EntitiesDescriptor>" {
entities := &saml.EntitiesDescriptor{}
if err := xml.Unmarshal(data, entities); err != nil {
return nil, err
}
for i, e := range entities.EntityDescriptors {
if len(e.IDPSSODescriptors) > 0 {
return &entities.EntityDescriptors[i], nil
}
}
return nil, errors.New("no entity found with IDPSSODescriptor")
}
if err != nil {
return nil, err
}
return entity, nil
}
// FetchMetadata returns metadata from an IDP metadata URL.
func FetchMetadata(ctx context.Context, httpClient *http.Client, metadataURL url.URL) (*saml.EntityDescriptor, error) {
req, err := http.NewRequest("GET", metadataURL.String(), nil)
if err != nil {
return nil, err
}
req = req.WithContext(ctx)
resp, err := httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return nil, httperr.Response(*resp)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return ParseMetadata(data)
}