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// Copyright The Notary Project Authors.
// 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 plugin
import (
"context"
"fmt"
"io"
"net/http"
"time"
"github.com/notaryproject/notation/internal/httputil"
)
// MaxPluginSourceBytes specifies the limit on how many bytes are allowed in the
// server's response to the download from URL request.
//
// The plugin source size must be strictly less than this value.
var MaxPluginSourceBytes int64 = 256 * 1024 * 1024 // 256 MiB
// PluginSourceType is an enum for plugin source
type PluginSourceType int
const (
// PluginSourceTypeFile means plugin source is file
PluginSourceTypeFile PluginSourceType = 1 + iota
// PluginSourceTypeURL means plugin source is URL
PluginSourceTypeURL
)
const (
// MediaTypeZip means plugin file is zip
MediaTypeZip = "application/zip"
// MediaTypeGzip means plugin file is gzip
MediaTypeGzip = "application/x-gzip"
)
// DownloadPluginFromURLTimeout is the timeout when downloading plugin from a
// URL
const DownloadPluginFromURLTimeout = 10 * time.Minute
// DownloadPluginFromURL downloads plugin source from url to a tmp file on file
// system
func DownloadPluginFromURL(ctx context.Context, pluginURL string, tmpFile io.Writer) error {
// Get the data
client := httputil.NewAuthClient(ctx, &http.Client{Timeout: DownloadPluginFromURLTimeout})
req, err := http.NewRequest(http.MethodGet, pluginURL, nil)
if err != nil {
return err
}
resp, err := client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
// Check server response
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s %q: https response bad status: %s", resp.Request.Method, resp.Request.URL, resp.Status)
}
// Write the body to file
lr := &io.LimitedReader{
R: resp.Body,
N: MaxPluginSourceBytes,
}
_, err = io.Copy(tmpFile, lr)
if err != nil {
return err
}
if lr.N == 0 {
return fmt.Errorf("%s %q: https response reached the %d MiB size limit", resp.Request.Method, resp.Request.URL, MaxPluginSourceBytes/1024/1024)
}
return nil
}
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