80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
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/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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import (
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"bytes"
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"crypto/md5"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"path"
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"github.com/PuerkitoBio/goquery"
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)
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type webCache struct {
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baseDir string
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}
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func newWebCache(baseDir string) (*webCache, error) {
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if err := os.MkdirAll(baseDir, 0755); err != nil {
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return nil, err
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}
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return &webCache{baseDir: baseDir}, nil
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}
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func (c *webCache) urlToLocal(url string) string {
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hash := md5.New()
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hash.Write([]byte(url))
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return path.Join(c.baseDir, fmt.Sprintf("%x", hash.Sum(nil)))
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}
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func (c *webCache) fetchUrl(url string) (*goquery.Document, error) {
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localPath := c.urlToLocal(url)
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if file, err := os.Open(localPath); err == nil {
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defer file.Close()
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return goquery.NewDocumentFromReader(file)
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} else {
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res, err := http.Get(url)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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var buff bytes.Buffer
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if _, err := buff.ReadFrom(res.Body); err != nil {
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return nil, err
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}
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if err := ioutil.WriteFile(localPath, buff.Bytes(), 0644); err != nil {
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return nil, err
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}
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return goquery.NewDocumentFromReader(&buff)
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}
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}
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