(Lianja) Upload Media to Twitter

Demonstrates uploading image or video files to Twitter. After uploading, the media_id can be used to attach the uploaded media to a tweet.

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// It requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Assume we've previously obtained an access token and saved it to a JSON file..
loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/twitter.json")

loHttp = createobject("CkHttp")

// Provide the OAuth 1.0a credentials:
loHttp.OAuth1 = .T.
loHttp.OAuthConsumerKey = "TWITTER_CONSUMER_KEY"
loHttp.OAuthConsumerSecret = "TWITTER_CONSUMER_SECRET"
loHttp.OAuthToken = loJsonToken.StringOf("oauth_token")
loHttp.OAuthTokenSecret = loJsonToken.StringOf("oauth_token_secret")

loReq = createobject("CkHttpRequest")
loReq.HttpVerb = "POST"
loReq.ContentType = "multipart/form-data"
loReq.Path = "/1.1/media/upload.json"

loReq.AddHeader("Expect","100-continue")

// Add a JPEG image file to the upload.
loFac = createobject("CkFileAccess")

loJpgBytes = loFac.ReadEntireFile("qa_data/jpg/starfish.jpg")
loReq.AddBytesForUpload("media","starfish.jpg",loJpgBytes)

loResp = loHttp.SynchronousRequest("upload.twitter.com",443,.T.,loReq)
if (loHttp.LastMethodSuccess <> .T.) then
    ? loHttp.LastErrorText
    release loJsonToken
    release loHttp
    release loReq
    release loFac
    return
endif

loJsonResponse = createobject("CkJsonObject")
loJsonResponse.EmitCompact = .F.
loJsonResponse.Load(loResp.BodyStr)

if (loResp.StatusCode <> 200) then
    ? loJsonResponse.Emit()
    release loJsonToken
    release loHttp
    release loReq
    release loFac
    release loJsonResponse
    return
endif

release loResp

// Show the successful response:
? loJsonResponse.Emit()
? "Success."

// A successful JSON response looks like this:

// 	{
// 	  "media_id": 793137045996646400,
// 	  "media_id_string": "793137045996646400",
// 	  "size": 6229,
// 	  "expires_after_secs": 86400,
// 	  "image": {
// 	    "image_type": "image\/jpeg",
// 	    "w": 120,
// 	    "h": 120
// 	  }
// 	}
// 

// Get the information from the JSON:
? "media_id_string = " + loJsonResponse.StringOf("media_id_string")
? "size = " + str(loJsonResponse.IntOf("size"))
? "image_type = " + loJsonResponse.StringOf("image.image_type")
? "height/width = " + str(loJsonResponse.IntOf("image.w")) + "," + str(loJsonResponse.IntOf("image.h"))


release loJsonToken
release loHttp
release loReq
release loFac
release loJsonResponse