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facebook.go
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facebook.go
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package cmd
import (
"bytes"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"time"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var (
facebook_page_access_token string
facebook_page_id string
)
var facebookCmd = &cobra.Command{
Use: "facebook",
Short: "Post on a Facebook page",
Long: `Post on a Facebook page. Note: \n * You need to set the FACEBOOK_PAGE_ACCESS_TOKEN in the environment`,
Args: cobra.ExactArgs(1),
RunE: facebookPost,
}
func InitFacebook() {
rootCmd.AddCommand(facebookCmd)
facebookCmd.Flags().StringVar(&facebook_page_id, "facebook-page-id", "", "Facebook page's ID")
viper.BindPFlag("facebook-page-id", facebookCmd.PersistentFlags().Lookup("facebook-page-id"))
addImageFlag(facebookCmd)
viper.BindEnv("FACEBOOK_PAGE_ACCESS_TOKEN")
}
type facebookAttachedMedia struct {
Id string `json:"media_fbid"`
}
type facebookPagePost struct {
Message string `json:"message"`
AccessToken string `json:"access_token"`
Media []facebookAttachedMedia `json:"attached_media,omitempty"`
}
func facebookPost(cmd *cobra.Command, args []string) error {
facebook_page_id = viper.GetString("facebook_page_id")
//LATER: are facebook page ID's always numeric? if so, validate
facebook_page_access_token = viper.GetString("facebook_page_access_token")
hasImage, err := checkImage()
if err != nil {
return err
}
var media facebookAttachedMedia
if hasImage {
photoId, photoErr := facebookPostImage()
if photoErr != nil {
return photoErr
}
media = facebookAttachedMedia{
Id: photoId,
}
slog.Debug("Facebook photo ID", "id", photoId)
}
body, bodyErr := getInput(args[0])
if bodyErr != nil {
return bodyErr
}
jsonBody := facebookPagePost{
Message: body,
AccessToken: facebook_page_access_token,
Media: []facebookAttachedMedia{media},
}
strBody, jsonErr := json.Marshal(jsonBody)
if jsonErr != nil {
return jsonErr
}
bytesBody := []byte(strBody)
bodyReader := bytes.NewReader(bytesBody)
requestURL := fmt.Sprintf("https://graph.facebook.com/v18.0/%s/feed", facebook_page_id)
req, reqErr := http.NewRequest(http.MethodPost, requestURL, bodyReader)
if reqErr != nil {
return reqErr
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", UserAgent)
client := http.Client{
Timeout: 30 * time.Second,
}
res, resErr := client.Do(req)
if resErr != nil {
return resErr
}
resBody, readErr := io.ReadAll(res.Body)
if readErr != nil {
return readErr
}
slog.Info("Facebook response", "status", res.Status, "body", resBody)
return nil
}
type facebookPhoto struct {
Id string `json:"id"`
}
func facebookPostImage() (string, error) {
requestURL := fmt.Sprintf("https://graph.facebook.com/v18.0/%s/photos", facebook_page_id)
res, err := postImage(requestURL,
"source",
imageFile,
map[string]string{
"published": "false",
"access_token": facebook_page_access_token,
"caption": imageCaption,
},
nil)
if err != nil {
return "", err
}
body, err := io.ReadAll(res.Body)
if err != nil {
return "", err
}
slog.Debug("Facebook media post response", "status", res.Status, "body", string(body))
var photo facebookPhoto
jsonErr := json.Unmarshal(body, &photo)
if jsonErr != nil {
return "", jsonErr
}
return photo.Id, nil
}