Finds the biggest possible version of any image

embiggener.js

function runParsers() {

    var parsers = [
        parseBandcamp,
        parseFlickr,
        parseSportsEngine,
        parseTwitter,
        parseWikimedia,
        parseYouTube,
    ];

    var result = null;

    parsers.forEach(function(parser) {
        if (result !== null) return;
        console.log("Testing "+parser.name.substring(5)+"...");
        result = parser(window.location);
    });

    if (result !== null) {
        window.location = result;
    } else {
        alert("Failed to embiggen! :(");
    }
}

function parseBandcamp(location) {
    if (/f\d\.bcbits\.com/gi.test(location.hostname)) {
        var re = /^\/img\/(a?\d{10})_\d+.jpg$/ig;
        var result = re.exec(location.pathname);
        if (result !== null) {
            var imgId = result[1];
            return "https://f1.bcbits.com/img/"+imgId+"_0.jpg";
        }
    }
    return null;
}

function parseFlickr(location) {
    if (/farm\d\.staticflickr\.com/gi.test(location.hostname)) {
        var re = /^\/\d{4}\/(\d{1,11})_[0-9a-f]{10}_\w(?:_d)?.jpg$/ig;
        var result = re.exec(location.pathname);
        if (result !== null) {
            var photoId = result[1];
            return "https://flickr.com/photo.gne?id="+photoId;
        }
    }
    return null;
}

function parseSportsEngine(location) {
    var hostnames = [
        "assets.ngin.com",
        "cdn1.sportngin.com",
        "cdn2.sportngin.com",
        "cdn3.sportngin.com",
        "cdn4.sportngin.com",
        // "assets.ngin.com.s3.amazonaws.com", // not actually used in the real world
    ];
    if (hostnames.indexOf(location.hostname) != -1) {
        var re = /^\/attachments\/photo\/([0-9a-f\-]{9,}\/.*?)_(?:large|medium|small|thumb)(\.\w+)$/ig;
        var result = re.exec(location.pathname);
        if (result !== null) {
            var fileIdAndName = result[1];
            var fileExt = result[2];
            return "https://"+location.hostname+"/attachments/photo/"+fileIdAndName+fileExt;
        }
    }
    return null;
}

function parseTwitter(location) {
    if (location.hostname == "pbs.twimg.com") {
        var re = /^\/media\/([\w\d_]+)\.(\w+)(?:\:\w+)?$/ig;
        var result = re.exec(location.pathname);
        if (result !== null) {
            var imageId = result[1];
            var fileExt = result[2];
            return "https://pbs.twimg.com/media/"+imageId+"."+fileExt+":large";
        }
    }
    return null;
}


function parseWikimedia(location) {
    if (location.hostname == "upload.wikimedia.org") {
        var re = /^\/(\w+)\/(\w+)(?:\/thumb)?\/[0-9a-f]\/[0-9a-f]{2}\/([^#<>\[\]\|\{\}\/]+)(?:\/(?:page\d+-)?\d+px-[^#<>\[\]\|\{\}\/]+)?$/ig;
        var result = re.exec(location.pathname);
        if (result !== null) {
            var website = result[1];
            var language = result[2];
            var filename = result[3];

            // special case for .wikimedia.org domains
            var specialLanguages = [ "commons", "species", "meta" ];
            if (website == "wikipedia" && specialLanguages.indexOf(language) != -1) {
                website = "wikimedia";
            }

            return "https://"+language+"."+website+".org/wiki/File:"+filename;
        }
    }
    return null;
}

function parseYouTube(location) {
    if (location.hostname == "i.ytimg.com") {
        var re = /^\/vi\/([^"&?/ ]{11})\/\w+.jpg$/ig;
        var result = re.exec(location.pathname);
        if (result !== null) {
            var videoId = result[1];
            return "https://i.ytimg.com/vi/"+videoId+"/maxresdefault.jpg";
        }
    }
    return null;
}