Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/public/elite/bower_components/horizontal-timeline/js/horizontal-timeline.js

@@ -0,0 +1,268 @@
+jQuery(document).ready(function($){
+	var timelines = $('.cd-horizontal-timeline'),
+		eventsMinDistance = 60;
+
+	(timelines.length > 0) && initTimeline(timelines);
+
+	function initTimeline(timelines) {
+		timelines.each(function(){
+			var timeline = $(this),
+				timelineComponents = {};
+			//cache timeline components 
+			timelineComponents['timelineWrapper'] = timeline.find('.events-wrapper');
+			timelineComponents['eventsWrapper'] = timelineComponents['timelineWrapper'].children('.events');
+			timelineComponents['fillingLine'] = timelineComponents['eventsWrapper'].children('.filling-line');
+			timelineComponents['timelineEvents'] = timelineComponents['eventsWrapper'].find('a');
+			timelineComponents['timelineDates'] = parseDate(timelineComponents['timelineEvents']);
+			timelineComponents['eventsMinLapse'] = minLapse(timelineComponents['timelineDates']);
+			timelineComponents['timelineNavigation'] = timeline.find('.cd-timeline-navigation');
+			timelineComponents['eventsContent'] = timeline.children('.events-content');
+
+			//assign a left postion to the single events along the timeline
+			setDatePosition(timelineComponents, eventsMinDistance);
+			//assign a width to the timeline
+			var timelineTotWidth = setTimelineWidth(timelineComponents, eventsMinDistance);
+			//the timeline has been initialize - show it
+			timeline.addClass('loaded');
+
+			//detect click on the next arrow
+			timelineComponents['timelineNavigation'].on('click', '.next', function(event){
+				event.preventDefault();
+				updateSlide(timelineComponents, timelineTotWidth, 'next');
+			});
+			//detect click on the prev arrow
+			timelineComponents['timelineNavigation'].on('click', '.prev', function(event){
+				event.preventDefault();
+				updateSlide(timelineComponents, timelineTotWidth, 'prev');
+			});
+			//detect click on the a single event - show new event content
+			timelineComponents['eventsWrapper'].on('click', 'a', function(event){
+				event.preventDefault();
+				timelineComponents['timelineEvents'].removeClass('selected');
+				$(this).addClass('selected');
+				updateOlderEvents($(this));
+				updateFilling($(this), timelineComponents['fillingLine'], timelineTotWidth);
+				updateVisibleContent($(this), timelineComponents['eventsContent']);
+			});
+
+			//on swipe, show next/prev event content
+			timelineComponents['eventsContent'].on('swipeleft', function(){
+				var mq = checkMQ();
+				( mq == 'mobile' ) && showNewContent(timelineComponents, timelineTotWidth, 'next');
+			});
+			timelineComponents['eventsContent'].on('swiperight', function(){
+				var mq = checkMQ();
+				( mq == 'mobile' ) && showNewContent(timelineComponents, timelineTotWidth, 'prev');
+			});
+
+			//keyboard navigation
+			$(document).keyup(function(event){
+				if(event.which=='37' && elementInViewport(timeline.get(0)) ) {
+					showNewContent(timelineComponents, timelineTotWidth, 'prev');
+				} else if( event.which=='39' && elementInViewport(timeline.get(0))) {
+					showNewContent(timelineComponents, timelineTotWidth, 'next');
+				}
+			});
+		});
+	}
+
+	function updateSlide(timelineComponents, timelineTotWidth, string) {
+		//retrieve translateX value of timelineComponents['eventsWrapper']
+		var translateValue = getTranslateValue(timelineComponents['eventsWrapper']),
+			wrapperWidth = Number(timelineComponents['timelineWrapper'].css('width').replace('px', ''));
+		//translate the timeline to the left('next')/right('prev') 
+		(string == 'next') 
+			? translateTimeline(timelineComponents, translateValue - wrapperWidth + eventsMinDistance, wrapperWidth - timelineTotWidth)
+			: translateTimeline(timelineComponents, translateValue + wrapperWidth - eventsMinDistance);
+	}
+
+	function showNewContent(timelineComponents, timelineTotWidth, string) {
+		//go from one event to the next/previous one
+		var visibleContent =  timelineComponents['eventsContent'].find('.selected'),
+			newContent = ( string == 'next' ) ? visibleContent.next() : visibleContent.prev();
+
+		if ( newContent.length > 0 ) { //if there's a next/prev event - show it
+			var selectedDate = timelineComponents['eventsWrapper'].find('.selected'),
+				newEvent = ( string == 'next' ) ? selectedDate.parent('li').next('li').children('a') : selectedDate.parent('li').prev('li').children('a');
+			
+			updateFilling(newEvent, timelineComponents['fillingLine'], timelineTotWidth);
+			updateVisibleContent(newEvent, timelineComponents['eventsContent']);
+			newEvent.addClass('selected');
+			selectedDate.removeClass('selected');
+			updateOlderEvents(newEvent);
+			updateTimelinePosition(string, newEvent, timelineComponents);
+		}
+	}
+
+	function updateTimelinePosition(string, event, timelineComponents) {
+		//translate timeline to the left/right according to the position of the selected event
+		var eventStyle = window.getComputedStyle(event.get(0), null),
+			eventLeft = Number(eventStyle.getPropertyValue("left").replace('px', '')),
+			timelineWidth = Number(timelineComponents['timelineWrapper'].css('width').replace('px', '')),
+			timelineTotWidth = Number(timelineComponents['eventsWrapper'].css('width').replace('px', ''));
+		var timelineTranslate = getTranslateValue(timelineComponents['eventsWrapper']);
+
+        if( (string == 'next' && eventLeft > timelineWidth - timelineTranslate) || (string == 'prev' && eventLeft < - timelineTranslate) ) {
+        	translateTimeline(timelineComponents, - eventLeft + timelineWidth/2, timelineWidth - timelineTotWidth);
+        }
+	}
+
+	function translateTimeline(timelineComponents, value, totWidth) {
+		var eventsWrapper = timelineComponents['eventsWrapper'].get(0);
+		value = (value > 0) ? 0 : value; //only negative translate value
+		value = ( !(typeof totWidth === 'undefined') &&  value < totWidth ) ? totWidth : value; //do not translate more than timeline width
+		setTransformValue(eventsWrapper, 'translateX', value+'px');
+		//update navigation arrows visibility
+		(value == 0 ) ? timelineComponents['timelineNavigation'].find('.prev').addClass('inactive') : timelineComponents['timelineNavigation'].find('.prev').removeClass('inactive');
+		(value == totWidth ) ? timelineComponents['timelineNavigation'].find('.next').addClass('inactive') : timelineComponents['timelineNavigation'].find('.next').removeClass('inactive');
+	}
+
+	function updateFilling(selectedEvent, filling, totWidth) {
+		//change .filling-line length according to the selected event
+		var eventStyle = window.getComputedStyle(selectedEvent.get(0), null),
+			eventLeft = eventStyle.getPropertyValue("left"),
+			eventWidth = eventStyle.getPropertyValue("width");
+		eventLeft = Number(eventLeft.replace('px', '')) + Number(eventWidth.replace('px', ''))/2;
+		var scaleValue = eventLeft/totWidth;
+		setTransformValue(filling.get(0), 'scaleX', scaleValue);
+	}
+
+	function setDatePosition(timelineComponents, min) {
+		for (i = 0; i < timelineComponents['timelineDates'].length; i++) { 
+		    var distance = daydiff(timelineComponents['timelineDates'][0], timelineComponents['timelineDates'][i]),
+		    	distanceNorm = Math.round(distance/timelineComponents['eventsMinLapse']) + 2;
+		    timelineComponents['timelineEvents'].eq(i).css('left', distanceNorm*min+'px');
+		}
+	}
+
+	function setTimelineWidth(timelineComponents, width) {
+		var timeSpan = daydiff(timelineComponents['timelineDates'][0], timelineComponents['timelineDates'][timelineComponents['timelineDates'].length-1]),
+			timeSpanNorm = timeSpan/timelineComponents['eventsMinLapse'],
+			timeSpanNorm = Math.round(timeSpanNorm) + 4,
+			totalWidth = timeSpanNorm*width;
+		timelineComponents['eventsWrapper'].css('width', totalWidth+'px');
+		updateFilling(timelineComponents['eventsWrapper'].find('a.selected'), timelineComponents['fillingLine'], totalWidth);
+		updateTimelinePosition('next', timelineComponents['eventsWrapper'].find('a.selected'), timelineComponents);
+	
+		return totalWidth;
+	}
+
+	function updateVisibleContent(event, eventsContent) {
+		var eventDate = event.data('date'),
+			visibleContent = eventsContent.find('.selected'),
+			selectedContent = eventsContent.find('[data-date="'+ eventDate +'"]'),
+			selectedContentHeight = selectedContent.height();
+
+		if (selectedContent.index() > visibleContent.index()) {
+			var classEnetering = 'selected enter-right',
+				classLeaving = 'leave-left';
+		} else {
+			var classEnetering = 'selected enter-left',
+				classLeaving = 'leave-right';
+		}
+
+		selectedContent.attr('class', classEnetering);
+		visibleContent.attr('class', classLeaving).one('webkitAnimationEnd oanimationend msAnimationEnd animationend', function(){
+			visibleContent.removeClass('leave-right leave-left');
+			selectedContent.removeClass('enter-left enter-right');
+		});
+		eventsContent.css('height', selectedContentHeight+'px');
+	}
+
+	function updateOlderEvents(event) {
+		event.parent('li').prevAll('li').children('a').addClass('older-event').end().end().nextAll('li').children('a').removeClass('older-event');
+	}
+
+	function getTranslateValue(timeline) {
+		var timelineStyle = window.getComputedStyle(timeline.get(0), null),
+			timelineTranslate = timelineStyle.getPropertyValue("-webkit-transform") ||
+         		timelineStyle.getPropertyValue("-moz-transform") ||
+         		timelineStyle.getPropertyValue("-ms-transform") ||
+         		timelineStyle.getPropertyValue("-o-transform") ||
+         		timelineStyle.getPropertyValue("transform");
+
+        if( timelineTranslate.indexOf('(') >=0 ) {
+        	var timelineTranslate = timelineTranslate.split('(')[1];
+    		timelineTranslate = timelineTranslate.split(')')[0];
+    		timelineTranslate = timelineTranslate.split(',');
+    		var translateValue = timelineTranslate[4];
+        } else {
+        	var translateValue = 0;
+        }
+
+        return Number(translateValue);
+	}
+
+	function setTransformValue(element, property, value) {
+		element.style["-webkit-transform"] = property+"("+value+")";
+		element.style["-moz-transform"] = property+"("+value+")";
+		element.style["-ms-transform"] = property+"("+value+")";
+		element.style["-o-transform"] = property+"("+value+")";
+		element.style["transform"] = property+"("+value+")";
+	}
+
+	//based on http://stackoverflow.com/questions/542938/how-do-i-get-the-number-of-days-between-two-dates-in-javascript
+	function parseDate(events) {
+		var dateArrays = [];
+		events.each(function(){
+			var singleDate = $(this),
+				dateComp = singleDate.data('date').split('T');
+			if( dateComp.length > 1 ) { //both DD/MM/YEAR and time are provided
+				var dayComp = dateComp[0].split('/'),
+					timeComp = dateComp[1].split(':');
+			} else if( dateComp[0].indexOf(':') >=0 ) { //only time is provide
+				var dayComp = ["2000", "0", "0"],
+					timeComp = dateComp[0].split(':');
+			} else { //only DD/MM/YEAR
+				var dayComp = dateComp[0].split('/'),
+					timeComp = ["0", "0"];
+			}
+			var	newDate = new Date(dayComp[2], dayComp[1]-1, dayComp[0], timeComp[0], timeComp[1]);
+			dateArrays.push(newDate);
+		});
+	    return dateArrays;
+	}
+
+	function daydiff(first, second) {
+	    return Math.round((second-first));
+	}
+
+	function minLapse(dates) {
+		//determine the minimum distance among events
+		var dateDistances = [];
+		for (i = 1; i < dates.length; i++) { 
+		    var distance = daydiff(dates[i-1], dates[i]);
+		    dateDistances.push(distance);
+		}
+		return Math.min.apply(null, dateDistances);
+	}
+
+	/*
+		How to tell if a DOM element is visible in the current viewport?
+		http://stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport
+	*/
+	function elementInViewport(el) {
+		var top = el.offsetTop;
+		var left = el.offsetLeft;
+		var width = el.offsetWidth;
+		var height = el.offsetHeight;
+
+		while(el.offsetParent) {
+		    el = el.offsetParent;
+		    top += el.offsetTop;
+		    left += el.offsetLeft;
+		}
+
+		return (
+		    top < (window.pageYOffset + window.innerHeight) &&
+		    left < (window.pageXOffset + window.innerWidth) &&
+		    (top + height) > window.pageYOffset &&
+		    (left + width) > window.pageXOffset
+		);
+	}
+
+	function checkMQ() {
+		//check if mobile or desktop device
+		return window.getComputedStyle(document.querySelector('.cd-horizontal-timeline'), '::before').getPropertyValue('content').replace(/'/g, "").replace(/"/g, "");
+	}
+});