/
get.go
79 lines (70 loc) · 2.06 KB
/
get.go
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// Copyright 2019 Finobo
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package stores
import (
"io/ioutil"
"net/http"
"net/url"
"github.com/mailchain/mailchain/internal/hash"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"gopkg.in/resty.v1"
)
// GetMessage get the message contents from the location and perform location hash check
func GetMessage(location string, integrityHash []byte, cache Cache) ([]byte, error) {
cacheMiss := false
msg, err := cache.GetMessage(location)
if err != nil {
cacheMiss = true
msg, err = getAnyMessage(location)
if err != nil {
return nil, err
}
}
if cacheMiss {
if err := cache.SetMessage(location, msg); err != nil {
log.Errorf("Could not able to store Key:%s to cache %v", location, err)
}
}
if err := hash.CompareContentsToHash(msg, integrityHash); len(integrityHash) != 0 && err != nil {
return nil, err
}
return msg, nil
}
func getAnyMessage(location string) ([]byte, error) {
parsed, err := url.Parse(location)
if err != nil {
return nil, err
}
switch parsed.Scheme {
case "http", "https":
return getHTTPMessage(location)
case "file":
return ioutil.ReadFile(parsed.Host + parsed.Path)
case "test":
return []byte(parsed.Host), nil
default:
return nil, errors.Errorf("unsupported scheme")
}
}
func getHTTPMessage(location string) ([]byte, error) {
res, err := resty.R().Get(location)
if err != nil {
return nil, errors.Wrap(err, "could not get message from `location`")
}
if res.StatusCode() != http.StatusOK {
return nil, errors.Errorf(res.Status())
}
return res.Body(), nil
}