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(Ruby) Facebook Download all Photos to Local Files

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 Ruby Downloads

Ruby Library for Linux and MAC OS X

require 'chilkat'

# 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.
fbCache = Chilkat::CkCache.new()
# The cache will use 1 level of 256 sub-directories.
fbCache.put_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
oauth2 = Chilkat::CkOAuth2.new()
oauth2.put_AccessToken("FACEBOOK-ACCESS-TOKEN")

rest = Chilkat::CkRest.new()

# Connect to Facebook.
success = rest.Connect("graph.facebook.com",443,true,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

# 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.
responseJson = rest.fullRequestNoBody("GET","/v2.7/me/photos")
if (rest.get_LastMethodSuccess() != true)
    print rest.lastErrorText() + "\n";
    exit
end

photoJson = Chilkat::CkJsonObject.new()
saPhotoUrls = Chilkat::CkStringArray.new()
sbPhotoIdPath = Chilkat::CkStringBuilder.new()

json = Chilkat::CkJsonObject.new()
json.put_EmitCompact(false)
json.Load(responseJson)

# Get the "after" cursor.
afterCursor = json.stringOf("paging.cursors.after")
while json.get_LastMethodSuccess() == true

    print "-------------------" + "\n";
    print "afterCursor = " + afterCursor + "\n";

    # For each photo id in this page...
    i = 0
    numItems = json.SizeOfArray("data")
    while i < numItems
        json.put_I(i)
        photoId = json.stringOf("data[i].id")
        print "photoId = " + photoId + "\n";

        # 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.
        photoJsonStr = fbCache.fetchText(photoId)
        if (fbCache.get_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")

            print "Fetching photo node from Facebook..." + "\n";

            # 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.get_LastMethodSuccess() != true)
                print rest.lastErrorText() + "\n";
                exit
            end

            # Add the photo JSON to the local cache.
            fbCache.SaveTextNoExpire(photoId,"",photoJsonStr)
        end

        # 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.get_LastMethodSuccess() == true)

            # Actually, we'll add a small JSON document that contains both the image ID and the URL.
            imgUrlJson = Chilkat::CkJsonObject.new()
            imgUrlJson.AppendString("id",photoId)
            imgUrlJson.AppendString("url",imageUrl)
            saPhotoUrls.Append(imgUrlJson.emit())
            print "imageUrl = " + imageUrl + "\n";
        end

        i = i + 1
    end

    # 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.get_LastMethodSuccess() != true)
        print rest.lastErrorText() + "\n";
        exit
    end

    json.Load(responseJson)
    afterCursor = json.stringOf("paging.cursors.after")
end

print "No more pages of photos." + "\n";

# 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.  
http = Chilkat::CkHttp.new()

# We'll cache the image data so that if run again, we don't re-download the same image again.
numUrls = saPhotoUrls.get_Count()
i = 0
urlJson = Chilkat::CkJsonObject.new()
imageBytes = Chilkat::CkByteData.new()
fac = Chilkat::CkFileAccess.new()

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.
    success = fbCache.FetchFromCache(imageUrl,imageBytes)
    if (fbCache.get_LastMethodSuccess() == false)
        #  This photo needs to be downloaded.

        sbImageUrl = Chilkat::CkStringBuilder.new()
        sbImageUrl.Append(imageUrl)

        # Let's form a filename..
        extension = ".jpg"
        if (sbImageUrl.Contains(".gif",false) == true)
            extension = ".gif"
        end

        if (sbImageUrl.Contains(".png",false) == true)
            extension = ".png"
        end

        if (sbImageUrl.Contains(".tiff",false) == true)
            extension = ".tiff"
        end

        if (sbImageUrl.Contains(".bmp",false) == true)
            extension = ".bmp"
        end

        sbLocalFilePath = Chilkat::CkStringBuilder.new()
        sbLocalFilePath.Append("C:/Photos/facebook/uploaded/")
        sbLocalFilePath.Append(photoId)
        sbLocalFilePath.Append(extension)

        success = http.QuickGet(imageUrl,imageBytes)
        if (http.get_LastMethodSuccess() != true)
            print http.lastErrorText() + "\n";
            exit
        end

        # 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)

        print "Downloaded to " + sbLocalFilePath.getAsString() + "\n";
    end

    i = i + 1
end

print "Finished downloading all Facebook photos!" + "\n";

 

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