Initial working commit

2024-04-23 08:52:59 -04:00
commit ee948f23c0
11 changed files with 625 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.idea/
+main
+imgproxy
+*.cfg
+img-proxy
+dist/
--- a/README.md
+++ b/README.md
@@ -0,0 +1,104 @@
+# img-proxy url generator
+
+img proxy [docs](https://docs.imgproxy.net/usage/processing)
+
+## build
+
+you can optionally hard code a path prefix on build
+```shell
+go build --ldflags="-X 'git.s.int/rrise/imgproxy/generator.PathPrefix=s3://mybucket'"
+```
+
+## config file
+
+###### params 
+
+[img-proxy]
+- `key` sha256 hmac key
+- `salt` sha256 hmac salt
+- `host` img-proxy server hostname
+- `encryption-key` aes encryption key
+- `plain-url` send plain filename. bypasses all encoding
+
+```ini
+[img-proxy]
+key=2c...47
+salt=27...27
+host=https://i.fooo.com
+encryption-key=1c...0b
+plain-url=1
+```
+
+## usage
+
+generate a plain url with an insecure signature
+```ini
+[img-proxy]
+host=https://i.fooo.com
+plain-url=1
+```
+
+```bash
+./imgproxy --image "local:///my-super-image.png"
+
+https://i.fooo.com/insecure/raw:1/plain/local:///my-super-image.png
+```
+
+generate a plain url with a signature
+```ini
+[img-proxy]
+host=https://i.fooo.com
+key=23...a4
+salt=3f...4a
+plain-url=1
+```
+
+```bash
+./imgproxy --image "local:///my-super-image.png"
+
+https://i.fooo.com/g0ociV0BWaK8JPXtkNsGxdK8IFHbVYczrcmiiv5T9pk/raw:1/plain/local://my-super-image.png
+```
+
+generate a hmac url with a signature
+```ini
+[img-proxy]
+host=https://i.fooo.com
+key=23...a4
+salt=3f...4a
+```
+
+```bash
+./imgproxy --image "local:///my-super-image.png"
+
+https://i.fooo.com/NIColt6GBjtbquJXAtEMMsptARPw0CdeduEcu-S9Voc/raw:1/bG9jYWw6Ly9teS1zdXBlci1pbWFnZS5wbmc
+```
+
+generate an encrypted url
+```ini
+[img-proxy]
+host=https://i.fooo.com
+key=23...a4
+salt=3f...4a
+encryption-key=1c...0b
+```
+
+```bash
+./imgproxy --image "local:///my-super-image.png"
+
+https://i.fooo.com/m3YtaMSgL86qCnfKCnS2i9_vLRmJSogdBx1o86cWbuc/raw:1/enc/F6FAWktv2SAFe5UQwMme0pB6JwKQJVtTI_6Xx-PUfKANdQk0pD1I13NPnv0CvkFT
+```
+
+generate a url with params
+```bash
+./imgproxy --image "local:///my-super-image.png" -p h:200 -p rot:90
+
+https://i.fooo.com/q-CfgLiuHTXDiZg7vBsUbZB3nkhzfsPgNrK0x20b878/h:200/rot:90/sm:1/enc/DrSKPtr8JkWx_Bf-vuxDTXRXfhrkZKTlPoQE61BzMfG2Mj1mD0qnthPq_Sfk8giv
+```
+
+
+generate a url a format
+```bash
+./imgproxy --image "local:///my-super-image.png" --format bmp -p h:200
+
+https://i.fooo.com/UMkz4OUNw6P9ShLdewuvW3ValMgCt263vZzU5gN57WQ/h:200/sm:1/enc/ECYxMeVBTjRxB7F-jdQ7W_-Fnv4YbmSJIKie-Hdtxd9vsmEKjU1YuWVSzdN97Mod.bmp
+```
--- a/build.sh
+++ b/build.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+go install
+
+for distro in $(go tool dist list)
+do
+    arrIN=(${distro//\// })
+
+    if [[ ${arrIN[0]} == 'linux' || ${arrIN[0]} == 'darwin'  || ${arrIN[0]} == 'freebsd' || ${arrIN[0]} == 'windows' ]]; then
+      echo "Building $distro..."
+      GOOS=${arrIN[0]} GOARCH=${arrIN[1]} go build --ldflags="-X 'main.Version=$(git describe --tags --abbrev=0)'" -o dist/img_proxy_${arrIN[0]}_${arrIN[1]}
+    fi
+done
--- a/generator/format.go
+++ b/generator/format.go
@@ -0,0 +1,41 @@
+package generator
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Format string
+
+const (
+	JPG  Format = "jpg"
+	PNG  Format = "png"
+	BMP  Format = "bmp"
+	WEBP Format = "webp"
+	GIF  Format = "gif"
+	ICO  Format = "ico"
+	DEF  Format = "default"
+)
+
+func (g *Generator) StringToFormat(string string) (Format, error) {
+	switch strings.ToLower(string) {
+	case "jpg":
+		return JPG, nil
+	case "jpeg":
+		return JPG, nil
+	case "png":
+		return PNG, nil
+	case "bmp":
+		return BMP, nil
+	case "webp":
+		return WEBP, nil
+	case "gif":
+		return GIF, nil
+	case "ico":
+		return ICO, nil
+	case "":
+		return DEF, nil
+	}
+
+	return "", fmt.Errorf("%s is not a valid format", string)
+}
--- a/generator/url.go
+++ b/generator/url.go
@@ -0,0 +1,142 @@
+package generator
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"fmt"
+	"git.s.int/rrise/imgproxy/printer"
+	"io"
+	"strings"
+)
+
+type Generator struct {
+	config Config
+}
+
+type Config struct {
+	Salt             []byte
+	saltBin          []byte
+	Key              []byte
+	keyBin           []byte
+	Host             string
+	EncryptionKey    *string
+	encryptionKeyBin []byte
+	PlainUrl         bool
+}
+
+var PathPrefix string
+
+func NewGenerator(config Config) (*Generator, error) {
+	var err error
+
+	gen := new(Generator)
+	gen.config = config
+
+	if gen.config.keyBin, err = hex.DecodeString(string(gen.config.Key)); err != nil {
+		return nil, err
+	}
+
+	if gen.config.saltBin, err = hex.DecodeString(string(gen.config.Salt)); err != nil {
+		return nil, err
+	}
+
+	if gen.config.EncryptionKey != nil && *gen.config.EncryptionKey != "" {
+		if gen.config.encryptionKeyBin, err = hex.DecodeString(*gen.config.EncryptionKey); err != nil {
+			return nil, fmt.Errorf("Key expected to be hex-encoded string")
+		}
+	}
+
+	return gen, nil
+}
+
+func (g *Generator) generatePlainUrl(file []byte) {
+
+}
+
+func (g *Generator) generateBase64Url(file []byte) string {
+	return base64.RawURLEncoding.EncodeToString(file)
+}
+
+func pkcs7pad(data []byte, blockSize int) []byte {
+	padLen := blockSize - len(data)%blockSize
+	padding := bytes.Repeat([]byte{byte(padLen)}, padLen)
+	return append(data, padding...)
+}
+
+func (g *Generator) generateBaseAesEncUrl(file []byte) (string, error) {
+	c, err := aes.NewCipher(g.config.encryptionKeyBin)
+	if err != nil {
+		return "", err
+	}
+
+	data := pkcs7pad(file, aes.BlockSize)
+
+	ciphertext := make([]byte, aes.BlockSize+len(data))
+	iv := ciphertext[:aes.BlockSize]
+
+	if _, err = io.ReadFull(rand.Reader, iv); err != nil {
+		return "", err
+	}
+
+	mode := cipher.NewCBCEncrypter(c, iv)
+	mode.CryptBlocks(ciphertext[aes.BlockSize:], data)
+
+	encryptedURL := g.generateBase64Url(ciphertext)
+
+	return "enc/" + encryptedURL, nil
+}
+
+func (g *Generator) GenerateUrl(file string, params []string, format Format) (string, error) {
+	if params == nil || len(params) == 0 || params[0] == "" {
+		params = []string{"raw:1"}
+	} else {
+		params = append(params, "sm:1")
+	}
+
+	if PathPrefix != "" {
+		file = PathPrefix + file
+	}
+
+	paramString := "/" + strings.Join(params, "/") + "/"
+
+	var url string
+	var err error
+
+	if g.config.PlainUrl {
+		url = "plain/" + file
+	} else if g.config.encryptionKeyBin != nil {
+		url, err = g.generateBaseAesEncUrl([]byte(file))
+		if err != nil {
+			return "", err
+		}
+	} else {
+		url = g.generateBase64Url([]byte(file))
+	}
+
+	path := fmt.Sprintf("%s%s", paramString, url)
+
+	if format != DEF {
+		path = path + "." + string(format)
+	}
+
+	var signature string
+	if len(g.config.keyBin) == 0 || len(g.config.saltBin) == 0 {
+		signature = "insecure"
+
+		printer.NewPrinter().LogWarning("Insecure url generated. Provide salt and key to sign and secure url.")
+
+	} else {
+		mac := hmac.New(sha256.New, g.config.keyBin)
+		mac.Write(g.config.saltBin)
+		mac.Write([]byte(path))
+		signature = base64.RawURLEncoding.EncodeToString(mac.Sum(nil))
+	}
+
+	return fmt.Sprintf("%s/%s%s", g.config.Host, signature, path), nil
+}
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,23 @@
+module git.s.int/rrise/imgproxy
+
+go 1.21.1
+
+require github.com/bigkevmcd/go-configparser v0.0.0-20230427073640-c6b631f70126
+
+require (
+	github.com/aws/aws-sdk-go v1.49.16 // indirect
+	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/charmbracelet/lipgloss v0.10.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.18 // indirect
+	github.com/mattn/go-runewidth v0.0.15 // indirect
+	github.com/muesli/reflow v0.3.0 // indirect
+	github.com/muesli/termenv v0.15.2 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/urfave/cli/v2 v2.27.1 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	golang.org/x/sys v0.12.0 // indirect
+)
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,48 @@
+github.com/aws/aws-sdk-go v1.49.16 h1:KAQwhLg296hfffRdh+itA9p7Nx/3cXS/qOa3uF9ssig=
+github.com/aws/aws-sdk-go v1.49.16/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
+github.com/bigkevmcd/go-configparser v0.0.0-20230427073640-c6b631f70126 h1:uru++pUKoS/yYU3Ohq9VItZdK/cT7FFJH/UUjOlxc+s=
+github.com/bigkevmcd/go-configparser v0.0.0-20230427073640-c6b631f70126/go.mod h1:zqqfbfnDeSdRs1WihmMjSbhb2Ptw8Jbus831xoqiIec=
+github.com/charmbracelet/lipgloss v0.10.0 h1:KWeXFSexGcfahHX+54URiZGkBFazf70JNMtwg/AFW3s=
+github.com/charmbracelet/lipgloss v0.10.0/go.mod h1:Wig9DSfvANsxqkRsqj6x87irdy123SR4dOXlKa91ciE=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
+github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
+github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
+github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-isatty v0.0.18 h1:DOKFKCQ7FNG2L1rbrmstDN4QVRdS89Nkh85u68Uwp98=
+github.com/mattn/go-isatty v0.0.18/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/muesli/reflow v0.3.0 h1:IFsN6K9NfGtjeggFP+68I4chLZV2yIKsXJFNZ+eWh6s=
+github.com/muesli/reflow v0.3.0/go.mod h1:pbwTDkVPibjO2kyvBQRBxTWEEGDGq0FlB1BIKtnHY/8=
+github.com/muesli/termenv v0.15.2 h1:GohcuySI0QmI3wN8Ok9PtKGkgkFIk7y6Vpb5PvrY+Wo=
+github.com/muesli/termenv v0.15.2/go.mod h1:Epx+iuz8sNs7mNKhxzH4fWXGNpZwUaJKRS1noLXviQ8=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
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+github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
+github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
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+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
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--- a/main.go
+++ b/main.go
@@ -0,0 +1,154 @@
+package main
+
+import (
+	"fmt"
+	"git.s.int/rrise/imgproxy/generator"
+	"git.s.int/rrise/imgproxy/printer"
+	"github.com/bigkevmcd/go-configparser"
+	"github.com/urfave/cli/v2"
+	"os"
+)
+
+var keyBin, saltBin []byte
+
+var imgGenerator *generator.Generator
+
+var Version = "v0.0.0"
+
+func main() {
+
+	pr := printer.NewPrinter()
+
+	app := &cli.App{
+		Name:           "imgproxy",
+		Description:    "URL Generator for the img proxy service",
+		DefaultCommand: "generate",
+		Version:        Version,
+		Commands: []*cli.Command{
+			{
+				Name:  "generate",
+				Usage: "Generate an image from a URL",
+				Action: func(c *cli.Context) error {
+					return run(c, pr)
+				},
+			},
+		},
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:     "image",
+				Aliases:  []string{"i"},
+				Required: true,
+			},
+			&cli.StringFlag{
+				Name:        "config",
+				Aliases:     []string{"c"},
+				Usage:       "Config file to load from",
+				DefaultText: "imgproxy.cfg",
+			},
+			&cli.StringFlag{
+				Name:    "format",
+				Aliases: []string{"f"},
+				Usage:   "Convert the image to the specified format",
+			},
+			&cli.StringSliceFlag{
+				Name:    "params",
+				Aliases: []string{"p"},
+				Usage:   "Processing options to be passed to the generator ref: https://docs.imgproxy.net/usage/processing",
+			},
+		},
+		Action: func(c *cli.Context) error {
+			return run(c, pr)
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		pr.LogError(err.Error())
+
+		os.Exit(1)
+	}
+}
+
+func run(c *cli.Context, p *printer.Printer) error {
+	err := initGenerator(c.String("config"))
+
+	if err != nil {
+		return err
+	}
+
+	url, err := signURL(c.String("image"), c.StringSlice("params"), c.String("format"))
+
+	if err != nil {
+		return err
+	}
+
+	p.LogInfo("Url Generated...")
+
+	println(url)
+
+	return nil
+}
+
+func initGenerator(config string) error {
+	var err error
+
+	if config == "" {
+		config = "imgproxy.cfg"
+	}
+
+	p, err := configparser.NewConfigParserFromFile(config)
+	if err != nil {
+		return err
+	}
+
+	if !p.HasSection("img-proxy") {
+		return fmt.Errorf("config error - [img-proxy] config required")
+	}
+
+	config, err = p.Get("img-proxy", "key")
+	if config != "" {
+		keyBin = []byte(config)
+	}
+
+	config, err = p.Get("img-proxy", "salt")
+	saltBin = []byte(config)
+
+	hostConf, err := p.Get("img-proxy", "host")
+	if err != nil {
+		return err
+	}
+
+	plainConfig, err := p.Get("img-proxy", "plain-url")
+
+	encKey, err := p.Get("img-proxy", "encryption-key")
+
+	generatorConfig := generator.Config{
+		Salt:          saltBin,
+		Key:           keyBin,
+		Host:          hostConf,
+		EncryptionKey: &encKey,
+		PlainUrl:      plainConfig != "",
+	}
+
+	imgGenerator, err = generator.NewGenerator(generatorConfig)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func signURL(file string, params []string, formatS string) (string, error) {
+	format, err := imgGenerator.StringToFormat(formatS)
+	if err != nil {
+		return "", err
+	}
+
+	url, err := imgGenerator.GenerateUrl(file, params, format)
+
+	if err != nil {
+		return "", err
+	}
+
+	return url, nil
+}
--- a/printer/log.go
+++ b/printer/log.go
@@ -0,0 +1,19 @@
+package printer
+
+import "fmt"
+
+func (p *Printer) LogSuccess(message string) {
+	fmt.Println(p.getSuccess().Render("✅  " + message))
+}
+
+func (p *Printer) LogWarning(message string) {
+	fmt.Println(p.getWarning().Render("‼️   WARNING: " + message))
+}
+
+func (p *Printer) LogInfo(message string) {
+	fmt.Println(p.getInfo().Render("ℹ️   " + message))
+}
+
+func (p *Printer) LogError(message string) {
+	fmt.Println(p.getError().Render("❌  ERROR: " + message))
+}
--- a/printer/printer.go
+++ b/printer/printer.go
@@ -0,0 +1,19 @@
+package printer
+
+import (
+	"fmt"
+)
+
+var Version = "0.0.0"
+
+type Printer struct {
+}
+
+func NewPrinter() *Printer {
+	return &Printer{}
+}
+
+func (p *Printer) PrintTitle() {
+	fmt.Println(p.getBright().Render(fmt.Sprintf("RSA File Encryption Tool %s", Version)))
+	fmt.Println()
+}
--- a/printer/styles.go
+++ b/printer/styles.go
@@ -0,0 +1,56 @@
+package printer
+
+import (
+	"github.com/charmbracelet/lipgloss"
+)
+
+func (*Printer) getBright() lipgloss.Style {
+	return lipgloss.NewStyle().
+		Bold(true).
+		Foreground(lipgloss.Color("#EDEEEDFF")).
+		Background(lipgloss.Color("#424E46FF")).
+		MarginTop(1).
+		PaddingLeft(3).
+		PaddingRight(3)
+}
+
+func (*Printer) getSuccess() lipgloss.Style {
+	return lipgloss.NewStyle().
+		Bold(true).
+		Foreground(lipgloss.Color("#00FF00")).
+		MarginTop(1).
+		MarginBottom(2).
+		PaddingLeft(2).
+		Width(120)
+}
+
+func (*Printer) getError() lipgloss.Style {
+	return lipgloss.NewStyle().
+		Bold(true).
+		Foreground(lipgloss.Color("#FF0000")).
+		PaddingLeft(2).
+		MarginTop(1).
+		MarginBottom(2).
+		Width(120)
+}
+
+func (*Printer) getWarning() lipgloss.Style {
+	return lipgloss.NewStyle().
+		Bold(true).
+		Foreground(lipgloss.Color("#000")).
+		Background(lipgloss.Color("#aeff00")).
+		PaddingLeft(2).
+		Width(120).
+		MarginTop(1).
+		PaddingTop(1).
+		PaddingBottom(1)
+}
+
+func (*Printer) getInfo() lipgloss.Style {
+	return lipgloss.NewStyle().
+		Foreground(lipgloss.Color("#4E82B7FF")).
+		PaddingLeft(2).
+		Width(120).
+		PaddingTop(1).
+		PaddingBottom(1)
+}