Two factor authentication support (#630)

* Initial commit for 2FA support

Signed-off-by: Andrew <write@imaginarycode.com>

* Add vendored files

* Add missing depends

* A few clean ups

* Added improvements, proper encryption

* Better encryption key

* Simplify "key" generation

* Make 2FA enrollment page more robust

* Fix typo

* Rename twofa/2FA to TwoFactor

* UNIQUE INDEX -> UNIQUE

vendor/github.com/boombuler/barcode/qr/qrcode.go

@@ -0,0 +1,170 @@
+package qr
+
+import (
+	"image"
+	"image/color"
+	"math"
+
+	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/utils"
+)
+
+type qrcode struct {
+	dimension int
+	data      *utils.BitList
+	content   string
+}
+
+func (qr *qrcode) Content() string {
+	return qr.content
+}
+
+func (qr *qrcode) Metadata() barcode.Metadata {
+	return barcode.Metadata{"QR Code", 2}
+}
+
+func (qr *qrcode) ColorModel() color.Model {
+	return color.Gray16Model
+}
+
+func (qr *qrcode) Bounds() image.Rectangle {
+	return image.Rect(0, 0, qr.dimension, qr.dimension)
+}
+
+func (qr *qrcode) At(x, y int) color.Color {
+	if qr.Get(x, y) {
+		return color.Black
+	}
+	return color.White
+}
+
+func (qr *qrcode) Get(x, y int) bool {
+	return qr.data.GetBit(x*qr.dimension + y)
+}
+
+func (qr *qrcode) Set(x, y int, val bool) {
+	qr.data.SetBit(x*qr.dimension+y, val)
+}
+
+func (qr *qrcode) CheckSum() int {
+	return 0
+}
+
+func (qr *qrcode) calcPenalty() uint {
+	return qr.calcPenaltyRule1() + qr.calcPenaltyRule2() + qr.calcPenaltyRule3() + qr.calcPenaltyRule4()
+}
+
+func (qr *qrcode) calcPenaltyRule1() uint {
+	var result uint
+	for x := 0; x < qr.dimension; x++ {
+		checkForX := false
+		var cntX uint
+		checkForY := false
+		var cntY uint
+
+		for y := 0; y < qr.dimension; y++ {
+			if qr.Get(x, y) == checkForX {
+				cntX++
+			} else {
+				checkForX = !checkForX
+				if cntX >= 5 {
+					result += cntX - 2
+				}
+				cntX = 1
+			}
+
+			if qr.Get(y, x) == checkForY {
+				cntY++
+			} else {
+				checkForY = !checkForY
+				if cntY >= 5 {
+					result += cntY - 2
+				}
+				cntY = 1
+			}
+		}
+
+		if cntX >= 5 {
+			result += cntX - 2
+		}
+		if cntY >= 5 {
+			result += cntY - 2
+		}
+	}
+
+	return result
+}
+
+func (qr *qrcode) calcPenaltyRule2() uint {
+	var result uint
+	for x := 0; x < qr.dimension-1; x++ {
+		for y := 0; y < qr.dimension-1; y++ {
+			check := qr.Get(x, y)
+			if qr.Get(x, y+1) == check && qr.Get(x+1, y) == check && qr.Get(x+1, y+1) == check {
+				result += 3
+			}
+		}
+	}
+	return result
+}
+
+func (qr *qrcode) calcPenaltyRule3() uint {
+	pattern1 := []bool{true, false, true, true, true, false, true, false, false, false, false}
+	pattern2 := []bool{false, false, false, false, true, false, true, true, true, false, true}
+
+	var result uint
+	for x := 0; x <= qr.dimension-len(pattern1); x++ {
+		for y := 0; y < qr.dimension; y++ {
+			pattern1XFound := true
+			pattern2XFound := true
+			pattern1YFound := true
+			pattern2YFound := true
+
+			for i := 0; i < len(pattern1); i++ {
+				iv := qr.Get(x+i, y)
+				if iv != pattern1[i] {
+					pattern1XFound = false
+				}
+				if iv != pattern2[i] {
+					pattern2XFound = false
+				}
+				iv = qr.Get(y, x+i)
+				if iv != pattern1[i] {
+					pattern1YFound = false
+				}
+				if iv != pattern2[i] {
+					pattern2YFound = false
+				}
+			}
+			if pattern1XFound || pattern2XFound {
+				result += 40
+			}
+			if pattern1YFound || pattern2YFound {
+				result += 40
+			}
+		}
+	}
+
+	return result
+}
+
+func (qr *qrcode) calcPenaltyRule4() uint {
+	totalNum := qr.data.Len()
+	trueCnt := 0
+	for i := 0; i < totalNum; i++ {
+		if qr.data.GetBit(i) {
+			trueCnt++
+		}
+	}
+	percDark := float64(trueCnt) * 100 / float64(totalNum)
+	floor := math.Abs(math.Floor(percDark/5) - 10)
+	ceil := math.Abs(math.Ceil(percDark/5) - 10)
+	return uint(math.Min(floor, ceil) * 10)
+}
+
+func newBarcode(dim int) *qrcode {
+	res := new(qrcode)
+	res.dimension = dim
+	res.data = utils.NewBitList(dim * dim)
+	return res
+}