Example of S3TileMapServiceLayer class using the ArcGIS Javascript API, with a fixed definition of the map service details within the class definition.

S3TiledMapServiceLayerFixedDefinition.js

dojo.require("esri.map");
dojo.require("esri.layers.tiled");
dojo.require("dojo/string");
 
var map;
 
function init() {
 
    dojo.declare("S3TiledMapServiceLayer", esri.layers.TiledMapServiceLayer, {
 
        constructor: function(externalS3TileCacheUrl) {
        
            this._s3TileUrl = externalS3TileCacheUrl;
        
            this.spatialReference = new esri.SpatialReference({ "wkid":4283 });
            this.initialExtent = (this.fullExtent = new esri.geometry.Extent(152.260192894019, -27.6147957518947, 153.686679767014, -26.9985153513847, this.spatialReference));
 
            this.tileInfo = new esri.layers.TileInfo({
                "rows" : 256,
                "cols" : 256,
                "dpi" : 96,
                "format" : "PNG32",
                "compressionQuality" : 0,
                "origin" : {
                    "x" : -400,
                    "y" : 9006799.25474099
                },
                "spatialReference" : {
                    "wkid" : 4283
                },
                "lods" : [
                    {"level" : 0, "resolution" : 4.75892201166056E-05, "scale" : 20000}, 
                    {"level" : 1, "resolution" : 3.56919150874542E-05, "scale" : 15000}, 
                    {"level" : 2, "resolution" : 2.37946100583028E-05, "scale" : 10000}
                ]
            });
 
            this.loaded = true;
            this.onLoad(this);
 
        },  // constructor       
    
        getTileUrl: function(level, row, col) {
            return this._s3TileUrl
                    + "/L" + dojo.string.pad(level.toString(), 2, '0')
                    + "/R" + dojo.string.pad(row.toString(16), 8, '0')
                    + "/C" + dojo.string.pad(col.toString(16), 8, '0')
                    + ".png";
        } // getTileUrl
    
    });
 
    var initExtent = new esri.geometry.Extent({ "xmin": 152.260192894019, "ymin": -27.6147957518947, "xmax": 153.686679767014, "ymax": -26.9985153513847, "spatialReference": { "wkid": 4283} });
    map = new esri.Map("map",{extent:initExtent});
 
    var tiledLayer = new S3TiledMapServiceLayer("https://<S3_BUCKET>.s3.amazonaws.com/_alllayers");
    map.addLayer(tiledLayer);
 
    dojo.connect(map, 'onLoad', function(theMap) {
        //resize the map when the browser resizes
        dojo.connect(window, 'resize', map,map.resize);
    });
}
 
dojo.addOnLoad(init);