91 lines
1.7 KiB
Go
91 lines
1.7 KiB
Go
package http
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"os/exec"
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"strings"
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)
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type page struct {
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Content string
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Links []string
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}
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func Visit(webmode, url string, width int) (page, error) {
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if width > 80 {
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width = 80
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}
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var w string
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switch webmode {
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case "lynx":
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w = "-width"
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case "w3m":
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w = "-cols"
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case "elinks":
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w = "-dump-width"
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default:
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return page{}, fmt.Errorf("Invalid webmode setting")
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}
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c, err := exec.Command(webmode, "-dump", w, fmt.Sprintf("%d", width), url).Output()
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if err != nil {
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return page{}, err
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}
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return parseLinks(string(c)), nil
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}
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// Returns false on err or non-text type
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// Else returns true
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func IsTextFile(url string) bool {
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resp, err := http.Head(url)
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if err != nil {
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return false
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}
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ctype := resp.Header.Get("content-type")
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if strings.Contains(ctype, "text") || ctype == "" {
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return true
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}
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return false
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}
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func parseLinks(c string) page {
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var out page
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contentUntil := strings.LastIndex(c, "References")
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if contentUntil >= 1 {
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out.Content = c[:contentUntil]
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} else {
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out.Content = c
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out.Links = make([]string, 0)
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return out
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}
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links := c[contentUntil+11:]
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links = strings.TrimSpace(links)
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linkSlice := strings.Split(links, "\n")
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out.Links = make([]string, 0, len(linkSlice))
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for _, link := range linkSlice {
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ls := strings.SplitN(link, ".", 2)
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if len(ls) < 2 {
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continue
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}
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out.Links = append(out.Links, strings.TrimSpace(ls[1]))
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}
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return out
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}
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func Fetch(url string) ([]byte, error) {
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resp, err := http.Get(url)
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if err != nil {
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return []byte{}, err
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}
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defer resp.Body.Close()
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bodyBytes, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return []byte{}, err
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}
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return bodyBytes, nil
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}
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