function getClientType()

in lambda/fulfillment/lib/middleware/1_parse.js [77:110]

• 21 lines of code
• 10 McCabe index (conditional complexity)

function getClientType(req) {
    if (req._type == 'ALEXA') {
        return req._type ;
    }
    // Try to determine which Lex client is being used based on patterns in the req - best effort attempt.
    const voiceortext = (req._preferredResponseType == 'SSML') ? "Voice" : "Text" ;


    //for LexV1 channels -- check for x-amz-lex:channel-type requestAttribute
    //more information on deploying an Amazon Lex V1 Bot on a Messaging Platform: https://docs.aws.amazon.com/lex/latest/dg/example1.html

    //for LexV2 channels -- check for x-amz-lex:channels:platform requestAttribute
    //more information on deploying an Amazon Lex V2 Bot on a Messaging Platform: https://docs.aws.amazon.com/lexv2/latest/dg/deploying-messaging-platform.html


    if ((_.get(req,"_event.requestAttributes.x-amz-lex:channel-type") == "Slack") || (_.get(req,"_event.requestAttributes.x-amz-lex:channels:platform") == "Slack")) {
        return "LEX.Slack." + voiceortext ;
    } else if ((_.get(req,"_event.requestAttributes.x-amz-lex:channel-type") == "Twilio-SMS") || (_.get(req,"_event.requestAttributes.x-amz-lex:channels:platform") == "Twilio")) {
        return "LEX.TwilioSMS." + voiceortext ;
    } else if (_.get(req,"_event.requestAttributes.x-amz-lex:accept-content-types")) {
        return "LEX.AmazonConnect." + voiceortext ;
    }
    else if (_.get(req,"_event.requestAttributes.x-amz-lex:channels:platform") == "Genesys Cloud") {
        return "LEX.GenesysCloud." + voiceortext;
    }
    else if (/^.*-.*-\d:.*-.*-.*-.*$/.test(_.get(req,"_event.userId"))){
        // user id pattern to detect lex-web-uithrough use of cognito id as userId: e.g. us-east-1:a8e1f7b2-b20d-441c-9698-aff8b519d8d5
        // TODO: add another clientType indicator for lex-web-ui?
        return "LEX.LexWebUI." + voiceortext ;
    } else {
        // generic LEX client
        return "LEX." + voiceortext ;
    }
}