(Go) Upload In-Memory Binary Data to Google Cloud Storage

Demonstrates how to upload in-memory binary data to Google Cloud Storage.

Note: This example requires Chilkat v9.5.0.69 or later because it uses the http.PBinaryBd method.

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

    // This example uses a previously obtained access token having permission for the 
    // scope "https://www.googleapis.com/auth/cloud-platform"

    // In this example, Get Google Cloud Storage OAuth2 Access Token, 
    // the service account access token was saved to a text file.  This example fetches the access token from the file..
    sbToken := chilkat.NewStringBuilder()
    sbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8")

    // Send a POST equivalent to this curl command.
    // The content of the file is contained in the request body.

    // curl -X POST --data-binary @[OBJECT] \
    //     -H "Authorization: Bearer [OAUTH2_TOKEN]" \
    //     -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
    //     "https://www.googleapis.com/upload/storage/v1/b/[BUCKET_NAME]/o?uploadType=media&name=[OBJECT_NAME]"

    http := chilkat.NewHttp()

    // Download a JPG image from the Internet, and then upload this JPG to
    // a Google Storage bucket.
    jpgUrl := "https://www.chilkatsoft.com/images/starfish.jpg"

    jpgData := chilkat.NewBinData()
    success := http.DownloadBd(jpgUrl,jpgData)
    if success != true {
        fmt.Println(http.LastErrorText())
        sbToken.DisposeStringBuilder()
        http.DisposeHttp()
        jpgData.DisposeBinData()
        return
    }

    http.SetAuthToken(*sbToken.GetAsString())

    // Construct a URL to upload to an object named "starfish.jpg" in the "chilkat-ocean" bucket.
    http.SetUrlVar("bucket_name","chilkat-ocean")
    http.SetUrlVar("object_name","starfish.jpg")
    url := "https://www.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=media&name={$object_name}"

    // Note: The PBinaryBd method first appears in Chilkat v9.5.0.69
    resp := http.PBinaryBd("POST",url,jpgData,"image/jpeg",false,false)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        sbToken.DisposeStringBuilder()
        http.DisposeHttp()
        jpgData.DisposeBinData()
        return
    }

    responseCode := resp.StatusCode()
    if responseCode == 401 {
        fmt.Println(resp.BodyStr())
        fmt.Println("If invalid credentials, then it is likely the access token expired.")
        fmt.Println("Your app should automatically fetch a new access token and re-try.")
        resp.DisposeHttpResponse()
        sbToken.DisposeStringBuilder()
        http.DisposeHttp()
        jpgData.DisposeBinData()
        return
    }

    fmt.Println("Response code: ", responseCode)
    fmt.Println("Response body")
    fmt.Println(resp.BodyStr())

    // A successful response looks like this:
    // Response code: 200
    // Response body
    // {
    //  "kind": "storage#object",
    //  "id": "chilkat-ocean/starfish.jpg/1502670320090292",
    //  "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
    //  "name": "starfish.jpg",
    //  "bucket": "chilkat-ocean",
    //  "generation": "1502670320090292",
    //  "metageneration": "1",
    //  "contentType": "image/jpeg",
    //  "timeCreated": "2017-08-14T00:25:20.040Z",
    //  "updated": "2017-08-14T00:25:20.040Z",
    //  "storageClass": "MULTI_REGIONAL",
    //  "timeStorageClassUpdated": "2017-08-14T00:25:20.040Z",
    //  "size": "6229",
    //  "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
    //  "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1502670320090292&alt=media",
    //  "crc32c": "9RjgwQ==",
    //  "etag": "CLT5kpW71dUCEAE="
    // }

    resp.DisposeHttpResponse()

    sbToken.DisposeStringBuilder()
    http.DisposeHttp()
    jpgData.DisposeBinData()