| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // 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 main |
| |
| import ( |
| "fmt" |
| "io/ioutil" |
| "net/http" |
| "os" |
| ) |
| |
| // Download the given URL, optionally using disk cache |
| func Download(url string) []byte { |
| filename := *cacheDir + string(os.PathSeparator) + CompileRegexp(`[^\w\.]+`).ReplaceAllString(url, "-") |
| if *cacheDir != "" { |
| if bytes, err := ioutil.ReadFile(filename); err == nil { |
| return bytes |
| } |
| } |
| resp, err := http.Get(url) |
| if err != nil { |
| panic(err) |
| } |
| if resp.StatusCode != 200 { |
| panic(fmt.Errorf("%s: %s", url, resp.Status)) |
| } |
| bytes, err := ioutil.ReadAll(resp.Body) |
| if err != nil { |
| panic(err) |
| } |
| resp.Body.Close() |
| if *cacheDir != "" { |
| os.MkdirAll(*cacheDir, 0750) |
| ioutil.WriteFile(filename, bytes, 0666) |
| } |
| return bytes |
| } |
