func index(w http.ResponseWriter, r *http.Request) {
fmt.Printf("%v %v\n", time.Now(), r)
w.Header().Set("Content-Type", "text/html")
maxColors := 256
fmt.Fprintf(w, `<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<title>Go Vibrant!</title>
<style>
* {
box-sizing: border-box;
margin: 0;
}
*:focus {
outline: none;
}
*::-moz-focus-inner, *::-moz-focus-outer {
border: 0;
}
body {
font-family: sans-serif;
max-width: 800px;
margin: auto;
}
h3 {
color: #800;
}
hr {
margin: 1em 0;
border: 0;
border-top: 1px ridge;
}
h1, form {
display: inline-block;
}
form {
margin-left: 1em;
}
button {
background: #9cf;
color: #fff;
border: 0;
padding: .5em 1em;
border-radius: 3px;
text-transform: uppercase;
letter-spacing: .5px;
box-shadow: 0 0 5px #ccc;
transition: all 125ms cubic-bezier(.8,0,.2,1);
cursor: pointer;
z-index: 1;
position: relative;
}
button:hover {
box-shadow: none;
}
button:active {
box-shadow: 0 0 0 100vmax rgba(153,204,255,1);
}
input[type="text"] {
margin-right: 1em;
}
</style>
</head>
<body>
<h1>choose an image:</h1>
<form action='/' method='post' enctype='multipart/form-data'>
<input type='file' name='test' accept='image/*' required>
<input type='text' size='4' maxlength='10' name='maxColors' title='maxColors (default: %d)'>
<button type='submit' name='vibrant' value='q'>Go Vibrant!</button>
</form>`, maxColors)
defer func() {
fmt.Fprintf(w, "\n </body>\n</html>")
}()
if r.FormValue("vibrant") == "" {
//w.WriteHeader(http.StatusOK)
return
}
fmt.Fprintf(w, " <hr>\n")
file, header, err := r.FormFile("test")
if err != nil {
//w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, " <h3>Error: 400 Bad Request</h3>")
return
}
switch header.Header["Content-Type"][0] {
case "image/jpeg":
case "image/png":
default:
if err != nil {
//w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, " <h3>Error: JPG/PNG only plz.</h3>")
return
}
}
img, _, err := image.Decode(file)
file.Seek(0, 0)
buf := bytes.NewBuffer(nil)
io.Copy(buf, file)
file.Close()
datauri := fmt.Sprintf("data:%s;base64,%s", header.Header["Content-Type"][0], base64.StdEncoding.EncodeToString(buf.Bytes()))
if err != nil {
//w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, " <h3>Error: %s</h3>", err)
return
}
if max := r.FormValue("maxColors"); max != "" {
n, err := strconv.Atoi(max)
if err != nil {
fmt.Fprintf(w, " <h3>Error: %s</h3>", err)
}
maxColors = n
}
start := time.Now()
bitmap := vibrant.NewBitmap(img)
palette, err := vibrant.NewPalette(bitmap, maxColors)
benchmark := time.Since(start)
if err != nil {
//w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, " <h3>Error: %s</h3>", err)
return
}
fmt.Fprintf(w, ` <style>
figure {
box-shadow: 0 0 10px #ccc;
}
img {
max-width: 100%%;
display: block;
margin: auto;
}
figcaption {
display: flex;
flex-wrap: wrap;
}
figcaption div {
flex: 1 1 16.6667%%;
padding: 3vw 0;
text-align: center;
display: inline-block;
}
textarea {
margin: 1em auto;
width: 100%%;
display: block;
height: 12em;
resize: none;
border: 0;
}
h2 {
text-align: center;
}`)
awesome := palette.ExtractAwesome()
stylesheet := ""
for _, sw := range awesome {
stylesheet += fmt.Sprintf("%s\n", sw)
if sw.Name == "Vibrant" {
vendorPrefixingIsAWESOME := fmt.Sprintf("{\n background-color: %s;\n color: %s;\n}\n", sw.RGBHex(), sw.TitleTextColor())
fmt.Fprintf(w, "::selection %s::-moz-selection %s::-webkit-selection %s", vendorPrefixingIsAWESOME, vendorPrefixingIsAWESOME, vendorPrefixingIsAWESOME)
}
}
fmt.Fprintf(w, "%s\n </style>\n", stylesheet)
fmt.Fprintf(w, " <figure>\n <img src='%s' alt='something happened'>\n", datauri)
fmt.Fprintf(w, ` <figcaption>
<div class="vibrant">Vibrant</div>
<div class="lightvibrant">LightVibrant</div>
<div class="darkvibrant">DarkVibrant</div>
<div class="muted">Muted</div>
<div class="lightmuted">LightMuted</div>
<div class="darkmuted">DarkMuted</div>
</figcaption>
</figure>`)
fmt.Fprintf(w, "\n <textarea readonly onclick='this.select()'>%s</textarea>\n", stylesheet)
if len(awesome) != 6 {
fmt.Fprintf(w, "<h3>If color swatches are missing which you believe should be present, try increasing <code>maxColors</code> in the text field above.</h3>\n")
}
fmt.Fprintf(w, "<h2>%v</h2>", benchmark)
}
func index(w http.ResponseWriter, r *http.Request) {
log.Println("<-", r.Method, r.URL)
setStatus := func(status int) {
w.WriteHeader(status)
statusText := ""
switch status {
case 200:
statusText = "OK"
case 400:
statusText = "Bad Request"
case 500:
statusText = "Internal Server Error"
}
log.Println("->", status, statusText)
}
w.Header().Set("Content-Type", "text/html")
data := &struct {
Response bool
Error string
Selection string
Stylesheet string
DataURI string
Missing bool
Benchmark time.Duration
DefaultMaxColors int
MaxColors int
}{DefaultMaxColors: vibrant.DEFAULT_CALCULATE_NUMBER_COLORS,
MaxColors: vibrant.DEFAULT_CALCULATE_NUMBER_COLORS}
defer func() {
t, err := template.New("").Parse(tpl)
if err != nil {
panic(err)
}
buf := new(bytes.Buffer)
if err := t.Execute(buf, data); err != nil {
panic(err)
}
io.Copy(w, buf)
}()
if r.Method != "POST" {
setStatus(200)
return
}
file, header, err := r.FormFile("test")
if err != nil {
setStatus(400)
data.Error = "400 Bad Request"
return
}
switch header.Header["Content-Type"][0] {
case "image/jpeg":
case "image/png":
default:
setStatus(400)
data.Error = "JPG/PNG only plz."
return
}
if max := r.FormValue("maxColors"); max != "" {
n, err := strconv.Atoi(max)
if err != nil || n < 1 {
setStatus(500)
data.Error = err.Error()
return
}
data.MaxColors = n
}
img, _, err := image.Decode(file)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
data.Error = err.Error()
return
}
file.Seek(0, 0)
buf := bytes.NewBuffer(nil)
io.Copy(buf, file)
file.Close()
data.DataURI = fmt.Sprintf("data:%s;base64,%s", header.Header["Content-Type"][0], base64.StdEncoding.EncodeToString(buf.Bytes()))
start := time.Now()
palette, err := vibrant.NewPalette(img, data.MaxColors)
data.Benchmark = time.Since(start)
if err != nil {
setStatus(500)
data.Error = err.Error()
return
}
awesome := palette.ExtractAwesome()
stylesheet := ""
for _, sw := range awesome {
stylesheet += fmt.Sprintf("%s\n", sw)
if sw.Name == "Vibrant" {
vendorPrefixingIsAWESOME := fmt.Sprintf("{\n background-color: %s;\n color: %s;\n}\n", sw.Color.RGBHex(), sw.Color.TitleTextColor())
data.Selection = fmt.Sprintf("::selection %s::-moz-selection %s::-webkit-selection %s", vendorPrefixingIsAWESOME, vendorPrefixingIsAWESOME, vendorPrefixingIsAWESOME)
}
}
data.Stylesheet = stylesheet
data.Missing = len(awesome) != 6
setStatus(200)
data.Response = true
return
}