mirror of https://github.com/gohugoio/hugo.git
131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
// Copyright 2016 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package data
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"path/filepath"
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"time"
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"github.com/gohugoio/hugo/cache/filecache"
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"github.com/gohugoio/hugo/config"
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"github.com/gohugoio/hugo/helpers"
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"github.com/spf13/afero"
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)
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var (
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resSleep = time.Second * 2 // if JSON decoding failed sleep for n seconds before retrying
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resRetries = 1 // number of retries to load the JSON from URL
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)
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// getRemote loads the content of a remote file. This method is thread safe.
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func (ns *Namespace) getRemote(cache *filecache.Cache, unmarshal func([]byte) (bool, error), req *http.Request) error {
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url := req.URL.String()
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if err := ns.deps.ExecHelper.Sec().CheckAllowedHTTPURL(url); err != nil {
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return err
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}
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if err := ns.deps.ExecHelper.Sec().CheckAllowedHTTPMethod("GET"); err != nil {
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return err
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}
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var headers bytes.Buffer
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req.Header.Write(&headers)
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id := helpers.MD5String(url + headers.String())
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var handled bool
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var retry bool
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_, b, err := cache.GetOrCreateBytes(id, func() ([]byte, error) {
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var err error
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handled = true
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for i := 0; i <= resRetries; i++ {
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ns.deps.Log.Infof("Downloading: %s ...", url)
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var res *http.Response
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res, err = ns.client.Do(req)
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if err != nil {
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return nil, err
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}
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var b []byte
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b, err = ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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res.Body.Close()
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if isHTTPError(res) {
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return nil, fmt.Errorf("Failed to retrieve remote file: %s, body: %q", http.StatusText(res.StatusCode), b)
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}
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retry, err = unmarshal(b)
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if err == nil {
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// Return it so it can be cached.
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return b, nil
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}
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if !retry {
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return nil, err
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}
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ns.deps.Log.Infof("Cannot read remote resource %s: %s", url, err)
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ns.deps.Log.Infof("Retry #%d for %s and sleeping for %s", i+1, url, resSleep)
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time.Sleep(resSleep)
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}
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return nil, err
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})
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if !handled {
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// This is cached content and should be correct.
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_, err = unmarshal(b)
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}
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return err
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}
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// getLocal loads the content of a local file
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func getLocal(url string, fs afero.Fs, cfg config.Provider) ([]byte, error) {
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filename := filepath.Join(cfg.GetString("workingDir"), url)
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return afero.ReadFile(fs, filename)
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}
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// getResource loads the content of a local or remote file and returns its content and the
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// cache ID used, if relevant.
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func (ns *Namespace) getResource(cache *filecache.Cache, unmarshal func(b []byte) (bool, error), req *http.Request) error {
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switch req.URL.Scheme {
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case "":
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url, err := url.QueryUnescape(req.URL.String())
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if err != nil {
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return err
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}
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b, err := getLocal(url, ns.deps.Fs.Source, ns.deps.Cfg)
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if err != nil {
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return err
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}
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_, err = unmarshal(b)
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return err
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default:
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return ns.getRemote(cache, unmarshal, req)
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}
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}
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func isHTTPError(res *http.Response) bool {
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return res.StatusCode < 200 || res.StatusCode > 299
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}
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