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package http
import (
"fmt"
"io/ioutil"
"net/http"
"os/exec"
"strings"
)
// Page represents the contents and links or an http/https document
type Page struct {
Content string
Links []string
}
// Visit is the main entry to viewing a web document in bombadillo.
// It takes a url, a terminal width, and which web backend the user
// currently has set. Visit returns a Page and an error
func Visit(webmode, url string, width int) (Page, error) {
if width > 80 {
width = 80
}
var w string
switch webmode {
case "lynx":
w = "-width"
case "w3m":
w = "-cols"
case "elinks":
w = "-dump-width"
default:
return Page{}, fmt.Errorf("Invalid webmode setting")
}
c, err := exec.Command(webmode, "-dump", w, fmt.Sprintf("%d", width), url).Output()
if err != nil && c == nil {
return Page{}, err
}
return parseLinks(string(c)), nil
}
// IsTextFile makes an http(s) head request to a given URL
// and determines if the content-type is text based. It then
// returns a bool
func IsTextFile(url string) bool {
resp, err := http.Head(url)
if err != nil {
return false
}
ctype := resp.Header.Get("content-type")
if strings.Contains(ctype, "text") || ctype == "" {
return true
}
return false
}
func parseLinks(c string) Page {
var out Page
contentUntil := strings.LastIndex(c, "References")
if contentUntil >= 1 {
out.Content = c[:contentUntil]
} else {
out.Content = c
out.Links = make([]string, 0)
return out
}
links := c[contentUntil+11:]
links = strings.TrimSpace(links)
linkSlice := strings.Split(links, "\n")
out.Links = make([]string, 0, len(linkSlice))
for _, link := range linkSlice {
ls := strings.SplitN(link, ".", 2)
if len(ls) < 2 {
continue
}
out.Links = append(out.Links, strings.TrimSpace(ls[1]))
}
return out
}
// Fetch makes an http(s) request and returns the []bytes
// for the response and an error. Fetch is used for saving
// the source file of an http(s) document
func Fetch(url string) ([]byte, error) {
resp, err := http.Get(url)
if err != nil {
return []byte{}, err
}
defer resp.Body.Close()
bodyBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return []byte{}, err
}
return bodyBytes, nil
}
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