146 lines
3.9 KiB
Go
146 lines
3.9 KiB
Go
package instagram
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"govd/util"
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"html"
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"io"
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"net/http"
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/bytedance/sonic"
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)
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var captionPattern = regexp.MustCompile(
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`(?s)<meta property="og:title" content=".*?: "(.*?)""`,
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)
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func BuildSignedPayload(contentURL string) (io.Reader, error) {
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timestamp := strconv.FormatInt(time.Now().UnixMilli(), 10)
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hash := sha256.New()
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_, err := io.WriteString(
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hash,
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contentURL+timestamp+apiKey,
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)
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if err != nil {
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return nil, fmt.Errorf("error writing to SHA256 hash: %w", err)
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}
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secretBytes := hash.Sum(nil)
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secretString := hex.EncodeToString(secretBytes)
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secretString = strings.ToLower(secretString)
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payload := map[string]string{
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"url": contentURL,
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"ts": timestamp,
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"_ts": apiTimestamp,
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"_tsc": "0", // ?
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"_s": secretString,
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}
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parsedPayload, err := sonic.ConfigFastest.Marshal(payload)
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if err != nil {
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return nil, fmt.Errorf("error marshalling payload: %w", err)
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}
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reader := strings.NewReader(string(parsedPayload))
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return reader, nil
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}
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func ParseIGramResponse(body []byte) (*IGramResponse, error) {
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var rawResponse interface{}
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//move to the start of the body
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// Use sonic's decoder to unmarshal the raw response
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if err := sonic.ConfigFastest.Unmarshal(body, &rawResponse); err != nil {
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return nil, fmt.Errorf("failed to decode response1: %w", err)
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}
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switch rawResponse.(type) {
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case []interface{}:
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// array of IGramMedia
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var media []*IGramMedia
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if err := sonic.ConfigFastest.Unmarshal(body, &media); err != nil {
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return nil, fmt.Errorf("failed to decode response2: %w", err)
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}
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return &IGramResponse{
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Items: media,
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}, nil
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case map[string]interface{}:
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// single IGramMedia
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var media IGramMedia
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if err := sonic.ConfigFastest.Unmarshal(body, &media); err != nil {
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return nil, fmt.Errorf("failed to decode response3: %w", err)
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}
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return &IGramResponse{
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Items: []*IGramMedia{&media},
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}, nil
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default:
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return nil, fmt.Errorf("unexpected response type: %T", rawResponse)
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}
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}
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func GetCDNURL(contentURL string) (string, error) {
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parsedURL, err := url.Parse(contentURL)
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if err != nil {
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return "", fmt.Errorf("can't parse igram URL: %w", err)
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}
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queryParams, err := url.ParseQuery(parsedURL.RawQuery)
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if err != nil {
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return "", fmt.Errorf("can't unescape igram URL: %w", err)
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}
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cdnURL := queryParams.Get("uri")
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return cdnURL, nil
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}
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func GetPostCaption(
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postURL string,
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) (string, error) {
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edgeProxyClient := util.GetEdgeProxyClient()
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req, err := http.NewRequest(
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http.MethodGet,
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postURL,
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nil,
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)
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if err != nil {
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return "", fmt.Errorf("failed to create request: %w", err)
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}
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req.Header.Set("User-Agent", util.ChromeUA)
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req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
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req.Header.Set("Accept-Language", "it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3")
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req.Header.Set("Referer", "https://www.instagram.com/accounts/onetap/?next=%2F")
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req.Header.Set("Alt-Used", "www.instagram.com")
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req.Header.Set("Connection", "keep-alive")
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req.Header.Set("Upgrade-Insecure-Requests", "1")
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req.Header.Set("Sec-Fetch-Dest", "document")
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req.Header.Set("Sec-Fetch-Mode", "navigate")
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req.Header.Set("Sec-Fetch-Site", "same-origin")
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req.Header.Set("Priority", "u=0, i")
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req.Header.Set("Pragma", "no-cache")
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req.Header.Set("Cache-Control", "no-cache")
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req.Header.Set("TE", "trailers")
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resp, err := edgeProxyClient.Do(req)
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if err != nil {
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return "", fmt.Errorf("failed to send request: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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// return an empty caption
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// probably 429 error
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return "", nil
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return "", fmt.Errorf("failed to read response body: %w", err)
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}
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matches := captionPattern.FindStringSubmatch(string(body))
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if len(matches) < 2 {
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// post has no caption most likely
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return "", nil
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}
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return html.UnescapeString(matches[1]), nil
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}
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