diceware/main.js

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JavaScript
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/**
* Our main Javascript file.
*/
(function() {
/**
* Return true if we have a function that returns cryptographically random
* values. False otherwise.
*/
function i_can_has_good_crypto() {
if (window.crypto && window.crypto.getRandomValues) {
return(true);
}
return(false);
} // End of i_can_has_good_crypto()
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/**
* Roll a die.
*
* @return integer A random number between 1 and 6, inclusive.
*/
function die_roll() {
var retval;
if (i_can_has_good_crypto()) {
var a = new Uint32Array(1);
window.crypto.getRandomValues(a);
retval = (a[0] % 6) + 1;
} else {
//
// Fall back to something way less secure. The user has already
// been warned.
//
retval = Math.floor(Math.random() * 6) + 1;
}
return(retval);
} // End of die_roll()
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/**
* Roll a die 5 times.
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*
* @return array an Array of 5 dice rolls
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*/
function roll_dice() {
var retval = new Array();
retval.push(die_roll());
retval.push(die_roll());
retval.push(die_roll());
retval.push(die_roll());
retval.push(die_roll());
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return(retval);
}
/**
* Look up a word from our wordlist.
*
* @param object wordlist Our hash table of dice rolls and their corresponding words.
* @param integer index
*
* @return string The word from the dicelist
*/
function get_word(wordlist, index) {
var retval = wordlist[index];
return(retval);
}
//
// Handler to mark the clicked number of dice button as active.
//
jQuery(".dice_button").on("click", function(e) {
jQuery(".dice_button").removeClass("active");
jQuery(e.target).addClass("active");
});
/**
* This function displays each dice roll.
*
* @param array rows Array of rows of dice rolls that we had.
* @param object cb Our callback to fire when done
*
*/
function display_row(rows, cb) {
var fadein_duration = 250;
var fadeout_delay = 750;
if (rows.length) {
//
// Grab a row, and hide each of the dice and the word in it.
//
var row = rows.shift();
var html = row.hide().appendTo(".results");
html.find(".dice_element").each(function(i, value) {
jQuery(value).hide();
});
//
// Now show the row, and loop through each element, fading in
// the dice and the word in sequence.
//
html.show(fadein_duration, function() {
jQuery(this).find(".dice_element").each(function(i, value) {
var delay = i * 100;
setTimeout(function() {
jQuery(value).show();
}, delay);
});
//
// Now fade out the entire row, and call ourselves again
// so we can repeat with the next row.
//
jQuery(this).delay(fadeout_delay)
.fadeOut(fadeout_delay, function() {
display_row(rows, cb);
});
});
} else {
//
// All done with displaying rows, fire our callback and get outta here.
//
cb();
}
} // End of display_row()
/**
* Display the actual results.
*
* @param cb object Optional callback to fire when done
*/
function display_results(cb) {
jQuery(".results_words_key").hide().clone().appendTo(".results");
jQuery(".results_words_value").hide().clone().appendTo(".results");
jQuery(".results").append("<br clear=\"all\" />");
jQuery(".results_phrase_key").hide().clone().appendTo(".results");
jQuery(".results_phrase_value").hide().clone().appendTo(".results");
jQuery(".results .results_words_key").fadeIn(500, function() {
jQuery(".results .results_words_value").fadeIn(500, function() {
jQuery(".results .results_phrase_key").fadeIn(500, function() {
jQuery(".results .results_phrase_value").fadeIn(500, function() {
if (cb) {
cb();
}
});
});
});
});
} // End of display_results()
/**
* Return the width of the browser window.
*/
function get_width() {
return(jQuery(window).width());
}
/**
* Return true if we are running on a mobile screen.
*/
function is_mobile() {
if (get_width() <= 480) {
return(true);
}
return(false);
} // End of is_mobile()
//
// Handler when the "Roll Dice" button is clicked. It gets the
// passphrase and updates the HTML with it.
//
jQuery("#roll_dice").on("click", function(e) {
var target_height = 200;
if (is_mobile()) {
target_height = 400;
}
jQuery(".results").animate({height: target_height}, 400);
//
// If we're running on an iPhone or similar, scroll down so that we can
// see the dice rolls and passphrase.
//
if (is_mobile()) {
var aTag = $("a[name='roll_dice_button']");
$("html,body").animate({scrollTop: aTag.offset().top}, "slow");
}
//
// Remove any old results
//
jQuery(".results").empty();
//
// Make our dice rolls
//
var num_dice = jQuery(".dice_button.active").html();
var passphrase = new Array();
var rolls = new Array();
for (var i=0; i<num_dice; i++) {
var roll = {};
roll.dice = roll_dice();
roll.word = get_word(wordlist, roll.dice.join(""));
rolls.push(roll);
passphrase.push(roll.word);
}
//
// Populate our results by cloning the hidden base rows which
// represent each die.
//
jQuery(".results_words_value").html(passphrase.join(" "));
jQuery(".results_phrase_value").html(passphrase.join(""));
var rows = new Array();
for (key in rolls) {
var roll = rolls[key];
var row = jQuery("<div></div>");
//
// Clone and append specific dice to this row.
//
for (key2 in roll.dice) {
var die = roll.dice[key2];
var classname = ".source .dice" + die;
var tmp = jQuery(classname).clone().appendTo(row);
}
//
// Now append the word
//
var dice_word = jQuery(".dice_word").clone();
dice_word.html("\"" + roll.word + "\"");
row.append(dice_word);
//
// And clear to the next line
//
row.append("<br clear=\"all\" />");
rows.push(row);
}
//
// Now display those rows.
//
display_row(rows, function() {
//
// And then display the results
//
display_results(function() {
//
// Set the height of this back to auto so we don't have unused space.
// I'm amazed that we don't see a "flash" of the results div
// temporarily shrinking, but this seems to work as per what I saw
// at http://stackoverflow.com/questions/5003220/javascript-jquery-animate-to-auto-height
//
// Well then.
//
var height = jQuery(".results").height();
jQuery(".results").css("height", "auto");
var new_height = jQuery(".results").height();
jQuery(".results").height(height);
jQuery(".results").animate({height: new_height}, 400);
});
});
});
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//
// If we're not on a mobile, bring in the GitHub ribbon.
//
if (!is_mobile()) {
jQuery("#github_ribbon").fadeIn(1000);
}
if (!i_can_has_good_crypto()) {
jQuery(".source .bad_crypto").clone().hide().fadeIn(800).appendTo(".message");
}
//
// Load our wordlist.
//
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jQuery.getScript("./wordlist.js").done(
function(data) {
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//
// If "debug" is set in the GET data, roll the dice on page load.
// Speed up my development a bit. :-)
//
if (location.search.indexOf("debug") != -1) {
jQuery("#roll_dice").click(); // Debugging
}
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}).fail(
function(jqxhr, settings, exception) {
console.log("Error loading Javascript:", jqxhr.status, settings, exception);
});
})();