/
facebook.go
156 lines (136 loc) · 3.56 KB
/
facebook.go
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// gplus2others - Send Google+ activities to other networks
//
// Copyright 2011 The gplus2others Authors. All rights reserved.
// Use of this source code is governed by the Simplified BSD
// license that can be found in the LICENSE file.
package gplus2others
import (
"appengine"
"appengine/memcache"
"appengine/urlfetch"
plus "google.golang.org/api/plus/v1"
"errors"
"io/ioutil"
"net/http"
"path"
"github.com/robteix/fblib"
)
func fbHandler(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
id := r.FormValue("id")
if id == "" {
serveError(c, w, errors.New("Missing ID Parameter"))
return
}
fc := fblib.NewFacebookClient(appConfig.FacebookAppId, appConfig.FacebookAppSecret)
fc.Transport = &urlfetch.Transport{Context: c}
code := r.FormValue("code")
if code == "" {
http.Redirect(w, r, fc.AuthURL("http://"+appConfig.AppHost+"/fb?id="+id, "offline_access,publish_actions"), http.StatusFound)
return
}
fc.RequestAccessToken(code, "http://"+appConfig.AppHost+"/fb?id="+id)
user := loadUser(r, id)
if user.Id == "" {
serveError(c, w, errors.New("Invalid user ID"))
return
}
user.FBAccessToken = fc.AccessToken
fbuser, fberr := fc.CurrentUser()
if fberr != nil {
c.Errorf("fc.CurrentUser() return error: %s\n", fberr)
}
user.FBId = fbuser.Id
user.FBName = fbuser.Name
saveUser(r, &user)
http.Redirect(w, r, "/", http.StatusFound)
}
func publishActivityToFacebook(w http.ResponseWriter, r *http.Request, act *plus.Activity, user *User) {
c := appengine.NewContext(r)
fc := fblib.NewFacebookClient(appConfig.FacebookAppId, appConfig.FacebookAppSecret)
fc.Transport = &urlfetch.Transport{Context: c}
fc.AccessToken = user.FBAccessToken
_ = w
var attachment *plus.ActivityObjectAttachments
obj := act.Object
kind := ""
content := ""
if act.Verb == "share" {
content = act.Annotation
//if content == "" {
// content = "Resharing " + obj.Actor.DisplayName
//}
kind = "status_share"
} else {
kind = "status"
if obj != nil {
if len(obj.Attachments) > 0 {
attachment = obj.Attachments[0]
kind = attachment.ObjectType
}
content = obj.Content
} else {
content = act.Title
}
}
content = removeTags(content)
var err error
switch kind {
case "status":
// post a status update
err = fc.PostStatus(content)
return
case "photo":
// download photo
mediaUrl := attachment.FullImage.Url
fileName := path.Base(mediaUrl)
var media []byte
item, err := memcache.Get(c, "picture"+mediaUrl)
if err != nil {
client := urlfetch.Client(c)
resp, err := client.Get(attachment.FullImage.Url)
c.Debugf("Downloading %s (%v)\n", mediaUrl, err)
if err != nil {
break
}
media, err := ioutil.ReadAll(resp.Body)
c.Debugf("Reading contents of %s (%v)\n", mediaUrl, err)
if err != nil {
break
}
memcache.Add(c, &memcache.Item{Key: "picture" + mediaUrl, Value: media})
} else {
media = item.Value
}
// now we post it
photo := fblib.Photo{
Message: content,
Source: media,
FileName: fileName,
}
err = fc.PostPhoto(photo)
c.Debugf("Posting %s to FB (%v)\n", mediaUrl, err)
case "article", "video":
// post a link
link := fblib.Link{}
link.Text = content
link.Url = attachment.Url
if attachment.FullImage != nil {
link.Image = attachment.FullImage.Url
}
err = fc.PostLink(link)
default:
if obj != nil {
link := fblib.Link{
Text: content,
Url: obj.Url,
}
err = fc.PostLink(link)
}
}
if err == fblib.ErrOAuth {
user.DisableFacebook()
saveUser(r, user)
}
c.Debugf("publishActivityToFacebook(%s): err=%v\n", kind, err)
}