twitter_query.html

<!--Create the user interface-->
<div style="display: grid; padding: 10vh;">
    <p class="lead" style="margin: auto;">
        May we access your tweets?
    </p>
    <br>
    <div id="request-token" href="/twitter/request_token" style="margin: auto;cursor: pointer;font-weight: 700;" target="_blank" class="btn btn-success">Get Twitter Data</div>
</div>

<pre id="twitter-feed" style="display: none;"></pre>


<script>
// when someone presses the request-token button, call readTwitterTimeline, 
// post the timeline to the console, and get the most recent 200 tweets.
makeTwitterButton("#request-token", () => {
    console.log("making api call");
    readTwitterTimeline((timeline) => {
        console.log(timeline);
    }, 200);
});


/**
 * cb: callback function that will be called with the complete timeline as an array
 * count (optional): number of Tweets to retreive per single call to the Twitter API, max 200, default 20
 * max_tweets (optional): stop retreiving Tweets after at least this many have been returned, default 3200
 * max_id: ignore, don't set this
 * timeline: ignore, don't set this
*/
function readTwitterTimeline(cb, count, max_tweets, max_id, timeline) {
    if(max_id) {
        let params = {"max_id": max_id};
        if(count) {
            params["count"] = count;
        }
        
        twitterAPICall("statuses/user_timeline", params, (data) => {
            if(data.length > 0) {
                let minID = data[data.length - 1].id_str;
                timeline = timeline.concat(data);
                console.log(timeline.length + " tweets read!");
                if(!max_tweets || timeline.length < max_tweets) {
                    readTwitterTimeline(cb, count, max_tweets, sub1(minID), timeline);
                }
                else {
                    cb(timeline);  
                }
            }
            else {
                cb(timeline);   
            }
        });
    }
    else {
        twitterAPICall("statuses/user_timeline", {"count": 1}, (data) => {
            let minID = data[data.length - 1].id_str;
            readTwitterTimeline(cb, count, max_tweets, sub1(minID), data);
        });
    }
}

// note that this will wrap around, so not good for retreiving the first ever Tweet
function sub1(s) {
    let num =  s.split("");
    num.map(x => parseInt(x));
    for(let i = num.length - 1; i >= 0; i--) {
        if(num[i] > 0) {
            num[i] = num[i] - 1;
            break;
        }
        else {
            num[i] = 9;
        }
    }
    return num.join("");
}
</script>