Get Image using jQuery.ajax() and decode it to base64

Question

What i want to do:

HTTP-GET an image (jpeg) using jQuery.ajax() from a basic-auth secured server. it seems like i get some data of the image, it must be binary. i wa

Answer 1

First of all, according to Retrieving binary file content using Javascript, base64 encode it and reverse-decode it using Python add the correct mimetype to the Ajax call:

 $.ajax({
            url: "someurltoajpeg",
            type: "GET",
            headers: {
                "Authorization" : "Basic " +  btoa("user:pw")
            },
            xhrFields: {
                withCredentials: true
            },
            mimeType: "text/plain; charset=x-user-defined"
        }).done(function( data, textStatus, jqXHR ) {
            $("#image").attr('src', 'data:image/jpeg;base64,' + base64encode(data));
        }).fail(function( jqXHR, textStatus, errorThrown ) {
            alert("fail: " + errorThrown);
        });

Then use base64Encode function described instead then the btoa:

function base64Encode(str) {
        var CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        var out = "", i = 0, len = str.length, c1, c2, c3;
        while (i < len) {
            c1 = str.charCodeAt(i++) & 0xff;
            if (i == len) {
                out += CHARS.charAt(c1 >> 2);
                out += CHARS.charAt((c1 & 0x3) << 4);
                out += "==";
                break;
            }
            c2 = str.charCodeAt(i++);
            if (i == len) {
                out += CHARS.charAt(c1 >> 2);
                out += CHARS.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
                out += CHARS.charAt((c2 & 0xF) << 2);
                out += "=";
                break;
            }
            c3 = str.charCodeAt(i++);
            out += CHARS.charAt(c1 >> 2);
            out += CHARS.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
            out += CHARS.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
            out += CHARS.charAt(c3 & 0x3F);
        }
        return out;
    }

bye