LexEvent - ResponseCard error

[iliasgal]

I am not sure if this is a bug.

I am using a Lambda function as fulfilment to AWS Lex. I want to send a response using the code below:

func scheduleMeeting(event events.LexEvent) (events.LexEvent, error) {

    //some code here

    response := events.LexEvent{
        DialogAction: &events.LexDialogAction{
            Type:             "Close",
            FulfillmentState: "Fulfilled",
            Message:          map[string]string{"contentType": "PlainText", "content": "Thank you!"},
        },
    }

    return response, nil
}

However, I am getting the following error:

An error has occurred: Invalid Lambda Response: Received invalid response from Lambda: Can not deserialize value of type ContentType from String "": value not one of declared Enum instance names: http://application/vnd.amazonaws.card.generic at Source: {"sessionAttributes":null,"dialogAction":{"type":"Close","fulfillmentState":"Fulfilled","message":{"content":"Thank you!","contentType":"PlainText"},"intentName":"","slots":null,"slotToElicit":"","responseCard":{"version":0,"contentType":"","genericAttachments":null}}}; line: 1, column: 239

This ContentType field and the Enum application/vnd.amazonaws.card.generic are on the ResponseCard field, which is optional according to the documentation.

[asuresh8]

Hmm that is strange, and if you add the the ContentType: application/vnd.amazonaws.card.generic in the ResponseCard object does the error go away?

[iliasgal]

I added the ResponseCard object.

var buttons []map[string]string
buttons = append(buttons, map[string]string{"text": "test", "value": "test"})

var attachements []events.Attachment
attachements = append(attachements, events.Attachment{
    Title:    "test",
    SubTitle: "test subtitle",
        ImageURL: "https://testurl.com",
    Buttons:  buttons,
})

response := events.LexEvent{
    DialogAction: &events.LexDialogAction{
        Type:             "Close",
        FulfillmentState: "Fulfilled",
        Message:          map[string]string{"contentType": "PlainText", "content": message},
        ResponseCard: events.LexResponseCard{
            Version:            1,
            ContentType:        "application/vnd.amazonaws.card.generic",
            GenericAttachments: attachements,
        },
    },
}

And the new error is:

An error has occurred: Invalid Lambda Response: Received invalid response from Lambda: Can not construct instance of GenericAttachment$Builder, problem: Image Url is not in range <1,2048> at [Source: {"sessionAttributes":null,"dialogAction":{"type":"Close","fulfillmentState":"Fulfilled","message":{"content":"Your meeting sdfsdf has been scheduled for 2018-04-05 11:00:00 +0000 UTC","contentType":"PlainText"},"intentName":"","slots":null,"slotToElicit":"","responseCard":{"version":1,"contentType":"application/vnd.amazonaws.card.generic","genericAttachments":[{"title":"test","subTitle":"test subtitle","imageUrl":"test url","attachmentLinkUrl":"","buttons":[{"text":"test","value":"test"}]}]}}}; line: 1, column: 494]

As you can see there is an Image URL field set.

[asuresh8]

It almost seems as if Lex is checking the parameters on their end. What if you change the ImageURL to an actually valid URL? ex https://a0.awsstatic.com/main/images/logos/aws_logo_smile_1200x630.png

[iliasgal]

I had to add ImageURL, AttachmentLinkURL and IntentName

var buttons []map[string]string
buttons = append(buttons, map[string]string{"text": "test", "value": "test"})

var attachements []events.Attachment
attachements = append(attachements, events.Attachment{
    Title:             "test",
    SubTitle:          "test subtitle",
    ImageURL:          "https://a0.awsstatic.com/main/images/logos/aws_logo_smile_1200x630.png",
    AttachmentLinkURL: "https://a0.awsstatic.com/main/images/logos/aws_logo_smile_1200x630.png",
    Buttons:           buttons,
})

response := events.LexEvent{
    DialogAction: &events.LexDialogAction{
        IntentName:       event.CurrentIntent.Name,
        Type:             "Close",
        FulfillmentState: "Fulfilled",
        Message:          map[string]string{"contentType": "PlainText", "content": message},
        ResponseCard: events.LexResponseCard{
            Version:            1,
            ContentType:        "application/vnd.amazonaws.card.generic",
            GenericAttachments: attachements,
        },
    },
}

return response, nil

And the new error:

An error has occurred: Invalid Lambda Response: Received invalid response from Lambda: Unrecognized field "intentName" (class CloseDialogAction), not marked as ignorable at [Source: {"sessionAttributes":null,"dialogAction":{"type":"Close","fulfillmentState":"Fulfilled","message":{"content":"Your meeting AAA has been scheduled for 2018-04-05 11:00:00 +0000 UTC","contentType":"PlainText"},"intentName":"ScheduleMeeting","slots":null,"slotToElicit":"","responseCard":{"version":1,"contentType":"application/vnd.amazonaws.card.generic","genericAttachments":[{"title":"test","subTitle":"test subtitle","imageUrl":"https://a0.awsstatic.com/main/images/logos/aws_logo_smile_1200x630.png","attachmentLinkUrl":"https://a0.awsstatic.com/main/images/logos/aws_logo_smile_1200x630.png","buttons":[{"text":"test","value":"test"}]}]}}}; line: 1, column: 642]

I do not know what is wrong with intentName, but it is obvious that the LexEvent requires all fields to be populated, even those that make no sense to populate as response.

[asuresh8]

Yeah the error here is that we don't add omitEmpty to the json serialization of all of the struct fields

[brieuc-le-faucheur]

Hey ! Did you find any fix to this ? I got the same error, in the same context (I want to create an answer without any responseCard)

[bmoffatt]

Merged #75

[ralf-cestusio]

Does this solve the problem for any of you? i still get

An error has occurred: Invalid Lambda Response: Received invalid response from Lambda: Unrecognized field "responseCard" (class DelegateDialogAction), not marked as ignorable at [Source: {"dialogAction":{"type":"Delegate","slots":{"environment":""},"responseCard":{}}}; line: 1, column: 79]

[olivoil]

I still get an error despite the omitempty field tag when not including a ResponseCard

    return events.LexEvent{
        SessionAttributes: evt.SessionAttributes,
        DialogAction: &events.LexDialogAction{
            IntentName:       evt.CurrentIntent.Name,
            Type:             "Close",
            FulfillmentState: "Fulfilled",
            Message: map[string]string{
                "contentType": "PlainText",
                "content":     fmt.Sprintf("Ok, I'll send notifciations for %s to this channel.", evt.CurrentIntent.Slots["ProjectKey"]),
            },
        },
    }, nil

An error has occurred: Invalid Lambda Response: Received invalid response from Lambda: Can not construct instance of ResponseCard$Builder, problem: Content type can't be null at [Source: {"dialogAction":{"type":"Close","fulfillmentState":"Fulfilled","message":{"content":"Ok, I'll send notifciations for PQ please to this channel.","contentType":"PlainText"},"intentName":"SubscribeToJiraProject","responseCard":{}}}; line: 1, column: 227]

[olivoil]

@bmoffatt I think LexDialogAction should declare ResponseCard as a pointer, so it's completely omitted when serializing:

type LexDialogAction struct {
    Type             string            `json:"type,omitempty"`
    FulfillmentState string            `json:"fulfillmentState,omitempty"`
    Message          map[string]string `json:"message,omitempty"`
    IntentName       string            `json:"intentName,omitempty"`
    Slots            Slots             `json:"slots,omitempty"`
    SlotToElicit     string            `json:"slotToElicit,omitempty"`
    ResponseCard     *LexResponseCard   `json:"responseCard,omitempty"`
}