IcyNet.eu/views/user/partials/avatar.pug

.rel.cropbox
	.row#fileChoose
		.col
			h3 Current Avatar
			.avatar
				include ../../includes/avatar.pug
		.col
			.alert.alert-danger#avatarAlert(style="display: none")
			.form-group
				label(for="#fileinput") Choose File
				input.form-control-file#fileinput(type="file", aria-labelledby="#maxFileText")
				small#maxFileText Max file size: 5 MB, only .png and .jpg allowed
	.content#crop(style="display: none;")
		h3 Crop the Image
		.alert.alert-info#cropAlert(style="display: none;") Uploading..
		img.preview#imageCropTag

script.
	function failAlert (msg) {
		$('#avatarAlert').text(msg)
		$('#avatarAlert').show()
	}

	function dataURItoBlob (dataURI) {
		// convert base64 to raw binary data held in a string
		// doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
		var byteString = atob(dataURI.split(',')[1])

		// separate out the mime component
		var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]

		// write the bytes of the string to an ArrayBuffer
		var ab = new ArrayBuffer(byteString.length)

		// create a view into the buffer
		var ia = new Uint8Array(ab)

		// set the bytes of the buffer to the correct values
		for (var i = 0; i < byteString.length; i++) {
		  ia[i] = byteString.charCodeAt(i)
		}

		// write the ArrayBuffer to a blob, and you're done
		var blob = new Blob([ab], {type: mimeString})
		return blob
	}

	function cropReady() {
		let cropargs = $('#imageCropTag').cropper('getData')
		let cropimage = $('#imageCropTag').cropper('getCroppedCanvas')

		$('#btnUpload').show()
		$('#btnDone').hide()
		$('#imageCropTag').attr('src', cropimage.toDataURL())
		$('#imageCropTag').show()
		$('#imageCropTag').cropper('destroy')

		let called = false
		$('#btnUpload').click(function (e) {
			if (called) return
			called = true
			$('#btnUpload').hide()
			$('#cropAlert').show()
			let formData = new FormData()
			formData.append('image', dataURItoBlob(fr.result))
			
			for (let i in cropargs) {
				formData.append(i, cropargs[i])
			}
			
			$.ajax({
				type: 'POST',
				url: '/api/avatar',
				data: formData,
				processData: false,
				contentType: false,
				success: function (data) {
					$('avatarModal').modal('hide')
					window.location.reload()
				},
				error: function (err) {
					if (err.responseJSON && err.responseJSON.error) {
						failAlert(err.responseJSON.error)
					}
					cancel()
				}
			})
		})
	}

	function ready (blob) {
		let match = blob.match(/data:image\/(\w+);/)
		let screenlen = $('.mobview').is(':visible')
		if (!match) {
			return failAlert('Not an image file!')
		}

		if (match[1] !== 'png' && match[1] !== 'jpg' && match[1] !== 'jpeg') {
			return failAlert('Unsupported image file')
		}

		$('#imageCropTag').attr('src', fr.result).hide()
		$('#fileChoose').hide()
		$('#btnUpload').hide()
		$('#btnDone').show()
		$('#crop').show()
		$('#imageCropTag').cropper({
			aspectRatio: 1 / 1,
			minContainerHeight: screenlen ? 128 : 512,
			minContainerWidth: screenlen ? 128 : 512,
			viewMode: 1
		})
	}

	function cancel() {
		$('#fileChoose').show()
		$('#cropAlert').hide()
		$('#btnDone').hide()
		$('#btnUpload').hide()
		$('#crop').hide()
		$('#imageCropTag').cropper('destroy')
		fr = null
	}

	function handleFileSelect() {
		if (!window.File || !window.FileReader || !window.FileList || !window.Blob) {
			return failAlert('The File APIs are not fully supported in this browser.')
		}

		let input = document.getElementById('fileinput')
		if (!input.files) {
			return failAlert('This browser doesn\'t seem to support the `files` property of file inputs.')
		}

		if (!input.files[0]) {
			return failAlert('Please select a file.')
		}

		if (input.files[0].size > 5000000) {
			return failAlert('This file is too big. Max: 5 MB')
		}

		file = input.files[0]
		fr = new FileReader()
		fr.readAsDataURL(file)
		fr.addEventListener('load', function (e) {
			ready(fr.result)
		})
	}

	$(window).ready(function () {
		$('#avatarModal').on('hidden.bs.modal', function (e) {
			cancel()
		})

		$('#fileinput').on('change', function (e) {
			e.preventDefault()
			handleFileSelect()
		})

		$('#btnDone').click(function (e) {
			cropReady()
		})
	})