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package ytparser
import (
"text/template"
"encoding/json"
"fmt"
"net/http"
"bytes"
"os"
"io"
"io/ioutil"
"strings"
"net/url"
"regexp"
)
const windowInitDataString string = "window[\"ytInitialData\"] = "
const initDataString string = "var ytInitialData = "
const baseUrl string = "https://youtube.com"
// A Item represents a youtube video, or more precisely its metadata (title,
// url...).
type Item struct {
Id string
Title string
Url string // The url of the video
ThumbUrl string // The thumbnail url
ChannelId string
ChannelTitle string
ChannelUrl string
Published string // The published date provided by youtube as is.
}
// Executes a given template on an item and returns the resulting string.
//
// The item is passed directly to the template execution. For example: "title:
// {{.Title}}" would return the item's title prefixed with "title: ".
func (item Item) Format(t *template.Template) string {
var b strings.Builder
err := t.Execute(&b, item)
if err != nil {
panic(err)
}
return b.String()
}
func (item Item) String() string {
return fmt.Sprintf("id: %s, title: %s, url: %s", item.Id, item.Title, item.Url)
}
func parsejson(data string) ([]Item, error) {
dec := json.NewDecoder(strings.NewReader(data))
depth := 0
isArray := false
isValue := false
var items []Item
var item Item
var names []string
nbItems := 0
for {
tok, err := dec.Token()
if err == io.EOF {
break
} else if err != nil {
return items, err
}
switch t := tok.(type) {
case json.Delim:
if t == '{' {
depth++
} else if t == '}' {
depth--
names = names[:depth]
}
isArray = t == '['
isValue = false
case string:
if !isArray {
if !isValue {
if t == "videoRenderer" {
if nbItems > 0 {
items = append(items, item)
}
item = Item{}
nbItems++
}
if depth > len(names) {
names = append(names, t)
} else {
names[depth - 1] = t
}
//fmt.Println(t, depth, len(names), names[depth - 1])
isValue = true
} else {
//fmt.Println(names[len(names) - 1])
if names[depth-1] == "videoId" {
item.Id = t
item.Url = fmt.Sprintf("https://youtube.com/watch?v=%s", t)
}
if depth >= 3 && names[depth-3] == "title" &&
names[depth-2] == "runs" &&
names[depth-1] == "text" {
item.Title = t
}
if depth >= 3 && names[depth-3] == "ownerText" &&
names[depth-2] == "runs" &&
names[depth-1] == "text" {
item.ChannelTitle = t
}
if depth >= 6 &&
names[depth-6] == "ownerText" &&
names[depth-5] == "runs" &&
names[depth-4] == "navigationEndpoint" &&
names[depth-3] == "commandMetadata" &&
names[depth-2] == "webCommandMetadata" &&
names[depth-1] == "url" {
item.ChannelUrl = baseUrl + t
}
if depth >= 4 &&
names[depth-4] == "videoRenderer" &&
names[depth-3] == "thumbnail" &&
names[depth-2] == "thumbnails" &&
names[depth-1] == "url" {
item.ThumbUrl = t
}
if depth >= 3 &&
names[depth-3] == "videoRenderer" &&
names[depth-2] == "publishedTimeText" &&
names[depth-1] == "simpleText" {
item.Published = t
}
if depth >= 5 &&
names[depth-5] == "longBylineText" &&
names[depth-4] == "runs" &&
names[depth-3] == "navigationEndpoint" &&
names[depth-2] == "browseEndpoint" &&
names[depth-1] == "browseId" {
item.ChannelId = t
}
isValue = false
}
}
default:
}
}
return items, nil
}
// Prints an array of Item based on a given template format.
//
// The format should follow go's text/template format. For example:
// "{{.Title}}" would print the titles of each item.
func PrintItems(items []Item, format string) {
t := template.Must(template.New("items").Parse(format))
for _, i := range items {
fmt.Println(i.Format(t))
}
}
func request(query string, page int, lang string) (string, error) {
q := url.QueryEscape(query)
url := fmt.Sprintf("https://www.youtube.com/results?search_query=%s&page=%d&hl=%s", q, page, lang)
res, err := http.DefaultClient.Get(url)
if err != nil {
return "", err
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", err
}
initString := windowInitDataString
idx := bytes.Index(body, []byte(windowInitDataString))
if idx == -1 {
initString = initDataString
idx = bytes.Index(body, []byte(initDataString))
}
idx += len(initString)
startData := body[idx:]
pattern := regexp.MustCompile(`; *\n`)
loc := pattern.FindIndex(startData)
startData = startData[:loc[0]]
return string(startData), nil
}
func isValidData(data string) bool {
return data != ""
}
// Launch a search on the given query, page and language and return an array of
// items and/or an error.
//
// The lang parameter must be a youtube supported language code ("en", "fr",
// "de"...) and allows getting certain information such as the published date
// in the selected language. If empty, youtube should detect the language based
// on location.
//
// This function may return items even if there is an error, allowing the
// search to be considered partially successful.
// If this is the case it most likely means there was an error during the
// parse, but some items were still successfully parsed before the error.
func Search(query string, page int, lang string) ([]Item, error) {
var data string = ""
var err error
for i := 1; i < 4 && !isValidData(data); i++ {
if i > 1 {
fmt.Fprintf(os.Stderr, "Yt data invalid, retrying (attempt %d)\n", i)
}
data, err = request(query, page, lang)
if err != nil {
return nil, err
}
}
return parsejson(data)
}
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