Node.js
Node.js
Facebook Download all Photos to Local Files
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Demonstrates how to download all of one's Facebook photos to a local filesystem directory. This sample code keeps a local cache to avoid re-downloading the same photos twice. The program can be run again after a time, and it will download only photos that haven't yet been downloaded.Chilkat Node.js Downloads
NODEJS_PRELUDE
function chilkatExample() {
var success = false;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// This example will use a local disk cache to avoid re-fetching the same
// photo id after it's been fetched once.
var fbCache = new chilkat.Cache();
// The cache will use 1 level of 256 sub-directories.
fbCache.Level = 1;
// Use a directory path that makes sense on your operating system..
fbCache.AddRoot("C:/fbCache");
// This example assumes a previously obtained an access token
var oauth2 = new chilkat.OAuth2();
oauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN";
var rest = new chilkat.Rest();
// Connect to Facebook.
success = rest.Connect("graph.facebook.com",443,true,true);
if (success !== true) {
console.log(rest.LastErrorText);
return;
}
// Provide the authentication credentials (i.e. the access key)
rest.SetAuthOAuth2(oauth2);
// There are two choices:
// We can choose to download the photos the person is tagged in or has uploaded
// by setting type to "tagged" or "uploaded".
rest.AddQueryParam("type","uploaded");
// To download all photos, we begin with an outer loop that iterates over
// the list of photo nodes in pages. Each page returned contains a list of
// photo node ids. Each photo node id must be retrieved to get the download URL(s)
// of the actual image.
// I don't know the max limit for the number of records that can be downloaded at once.
rest.AddQueryParam("limit","100");
// Get the 1st page of photos ids.
// See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information.
var responseJson = rest.FullRequestNoBody("GET","/v2.7/me/photos");
if (rest.LastMethodSuccess !== true) {
console.log(rest.LastErrorText);
return;
}
var photoJson = new chilkat.JsonObject();
var saPhotoUrls = new chilkat.StringArray();
var sbPhotoIdPath = new chilkat.StringBuilder();
var json = new chilkat.JsonObject();
json.EmitCompact = false;
json.Load(responseJson);
var i;
var photoId;
var imageUrl;
// Get the "after" cursor.
var afterCursor = json.StringOf("paging.cursors.after");
while (json.LastMethodSuccess == true) {
console.log("-------------------");
console.log("afterCursor = " + afterCursor);
// For each photo id in this page...
i = 0;
var numItems = json.SizeOfArray("data");
while (i < numItems) {
json.I = i;
photoId = json.StringOf("data[i].id");
console.log("photoId = " + photoId);
// We need to fetch the JSON for this photo. Check to see if it's in the local disk cache,
// and if not, then get it from Facebook.
var photoJsonStr = fbCache.FetchText(photoId);
if (fbCache.LastMethodSuccess == false) {
// It's not locally available, so get it from Facebook..
sbPhotoIdPath.Clear();
sbPhotoIdPath.Append("/v2.7/");
sbPhotoIdPath.Append(photoId);
rest.ClearAllQueryParams();
rest.AddQueryParam("fields","id,album,images");
console.log("Fetching photo node from Facebook...");
// This REST request will continue using the existing connection.
// If the connection was closed, it will automatically reconnect to send the request.
photoJsonStr = rest.FullRequestNoBody("GET",sbPhotoIdPath.GetAsString());
if (rest.LastMethodSuccess !== true) {
console.log(rest.LastErrorText);
return;
}
// Add the photo JSON to the local cache.
fbCache.SaveTextNoExpire(photoId,"",photoJsonStr);
}
// Parse the photo JSON and add the main photo download URL to saPhotoUrls
// There may be multiple URLs in the images array, but the 1st one is the largest and main photo URL.
// The others are smaller sizes of the same photo.
photoJson.Load(photoJsonStr);
imageUrl = photoJson.StringOf("images[0].source");
if (photoJson.LastMethodSuccess == true) {
// Actually, we'll add a small JSON document that contains both the image ID and the URL.
var imgUrlJson = new chilkat.JsonObject();
imgUrlJson.AppendString("id",photoId);
imgUrlJson.AppendString("url",imageUrl);
saPhotoUrls.Append(imgUrlJson.Emit());
console.log("imageUrl = " + imageUrl);
}
i = i+1;
}
// Prepare for getting the next page of photos ids.
// We can continue using the same REST object.
// If already connected, we'll continue using the existing connection.
// Otherwise, a new connection will automatically be made if needed.
rest.ClearAllQueryParams();
rest.AddQueryParam("type","uploaded");
rest.AddQueryParam("limit","20");
rest.AddQueryParam("after",afterCursor);
// Get the next page of photo ids.
responseJson = rest.FullRequestNoBody("GET","/v2.7/me/photos");
if (rest.LastMethodSuccess !== true) {
console.log(rest.LastErrorText);
return;
}
json.Load(responseJson);
afterCursor = json.StringOf("paging.cursors.after");
}
console.log("No more pages of photos.");
// Now iterate over the photo URLs and download each to a file.
// We can use Chilkat HTTP. No Facebook authorization (access token) is required to download
// the photo once the URL is known.
var http = new chilkat.Http();
// We'll cache the image data so that if run again, we don't re-download the same image again.
var numUrls = saPhotoUrls.Count;
i = 0;
var urlJson = new chilkat.JsonObject();
var fac = new chilkat.FileAccess();
while (i < numUrls) {
urlJson.Load(saPhotoUrls.GetString(i));
photoId = urlJson.StringOf("id");
imageUrl = urlJson.StringOf("url");
// Check the local cache for the image data.
// Only download and save if not already cached.
imageBytes = fbCache.FetchFromCache(imageUrl);
if (fbCache.LastMethodSuccess == false) {
// This photo needs to be downloaded.
var sbImageUrl = new chilkat.StringBuilder();
sbImageUrl.Append(imageUrl);
// Let's form a filename..
var extension = ".jpg";
if (sbImageUrl.Contains(".gif",false) == true) {
extension = ".gif";
}
if (sbImageUrl.Contains(".png",false) == true) {
extension = ".png";
}
if (sbImageUrl.Contains(".tiff",false) == true) {
extension = ".tiff";
}
if (sbImageUrl.Contains(".bmp",false) == true) {
extension = ".bmp";
}
var sbLocalFilePath = new chilkat.StringBuilder();
sbLocalFilePath.Append("C:/Photos/facebook/uploaded/");
sbLocalFilePath.Append(photoId);
sbLocalFilePath.Append(extension);
imageBytes = http.QuickGet(imageUrl);
if (http.LastMethodSuccess !== true) {
console.log(http.LastErrorText);
return;
}
// We've downloaded the photo image bytes into memory.
// Save it to the cache AND save it to the output file.
fbCache.SaveToCacheNoExpire(imageUrl,"",imageBytes);
fac.WriteEntireFile(sbLocalFilePath.GetAsString(),imageBytes);
console.log("Downloaded to " + sbLocalFilePath.GetAsString());
}
i = i+1;
}
console.log("Finished downloading all Facebook photos!");
}
chilkatExample();