(Go) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    // --------------------------------------------------------------------------------------------------------
    // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    // Once connected, the REST object may be re-used for many REST API calls.
    // (It's a good idea to put the connection setup code in a separate function/subroutine.)
    // --------------------------------------------------------------------------------------------------------

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Google Contacts OAuth2 Access Token

    jsonToken := chilkat.NewJsonObject()
    success := jsonToken.LoadFile("qa_data/tokens/googleContacts.json")
    if success != true {
        fmt.Println("Failed to load googleContacts.json")
        jsonToken.DisposeJsonObject()
        return
    }

    gAuth := chilkat.NewAuthGoogle()
    gAuth.SetAccessToken(*jsonToken.StringOf("access_token"))

    rest := chilkat.NewRest()

    // Connect using TLS.
    bAutoReconnect := true
    success = rest.Connect("www.google.com",443,true,bAutoReconnect)

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth)

    // ----------------------------------------------
    // OK, the REST connection setup is completed..
    // ----------------------------------------------

    // To get the photo, send the following:

    // 	GET /m8/feeds/photos/media/default/contactId

    rest.AddHeader("GData-Version","3.0")

    sbPath := chilkat.NewStringBuilder()
    // Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
    contactId := "1ea2e4fe0ef24e09"
    sbPath.SetString("/m8/feeds/photos/media/default/{contactId}")
    numReplacements := sbPath.Replace("{contactId}",contactId)

    imageData := chilkat.NewBinData()
    success = rest.FullRequestNoBodyBd("GET",*sbPath.GetAsString(),imageData)
    if success != true {
        fmt.Println(rest.LastErrorText())
        jsonToken.DisposeJsonObject()
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        sbPath.DisposeStringBuilder()
        imageData.DisposeBinData()
        return
    }

    // A 404 response indicates the contact has no photo.
    // (We could've first fetched the contact information, parsed out the 
    // photo etag, and then if no photo etag existed, we'd know the contact has no
    // photo.  Or... we can just try to download the photo and if a 404 is received,
    // we know there's no photo.  Much simpler.)
    if rest.ResponseStatusCode() == 404 {
        fmt.Println("This contact has no photo.")
        jsonToken.DisposeJsonObject()
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        sbPath.DisposeStringBuilder()
        imageData.DisposeBinData()
        return
    }

    // A successful response will have a status code equal to 200.
    if rest.ResponseStatusCode() != 200 {
        // If the response was not successful, then the response body
        // does not contain image data.  Instead it contains XML.
        sbResponseBody := chilkat.NewStringBuilder()
        sbResponseBody.AppendBd(imageData,"utf-8",0,0)

        fmt.Println("response status code = ", rest.ResponseStatusCode())
        fmt.Println("response status text = ", rest.ResponseStatusText())
        fmt.Println("response header: ", rest.ResponseHeader())
        fmt.Println("response body: ", *sbResponseBody.GetAsString())
        fmt.Println("request startline: ", rest.LastRequestStartLine())
        fmt.Println("request header: ", rest.LastRequestHeader())
        jsonToken.DisposeJsonObject()
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        sbPath.DisposeStringBuilder()
        imageData.DisposeBinData()
        sbResponseBody.DisposeStringBuilder()
        return
    }

    // Examine the content-type in the response header so we know what file
    // extension to use (.jpg, .png, etc.)
    sbContentType := chilkat.NewStringBuilder()
    sbContentType.Append(*rest.ResponseHdrByName("Content-Type"))

    if sbContentType.ContentsEqual("image/jpeg",false) == true {
        imageData.WriteFile("qa_output/contact_photo.jpg")
    }

    if sbContentType.ContentsEqual("image/png",false) == true {
        imageData.WriteFile("qa_output/contact_photo.png")
    }

    fmt.Println("Content-Type: ", *sbContentType.GetAsString())
    fmt.Println("Success.")

    jsonToken.DisposeJsonObject()
    gAuth.DisposeAuthGoogle()
    rest.DisposeRest()
    sbPath.DisposeStringBuilder()
    imageData.DisposeBinData()
    sbResponseBody.DisposeStringBuilder()
    sbContentType.DisposeStringBuilder()