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controllers.go
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controllers.go
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package main
import (
"encoding/json"
"fmt"
"net/http"
"strings"
"gopkg.in/h2non/bimg.v1"
"gopkg.in/h2non/filetype.v0"
)
func indexController(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
ErrorReply(r, w, ErrNotFound, ServerOptions{})
return
}
body, _ := json.Marshal(CurrentVersions)
w.Header().Set("Content-Type", "application/json")
w.Write(body)
}
func healthController(w http.ResponseWriter, r *http.Request) {
health := GetHealthStats()
body, _ := json.Marshal(health)
w.Header().Set("Content-Type", "application/json")
w.Write(body)
}
func imageController(o ServerOptions, operation Operation) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, req *http.Request) {
var imageSource = MatchSource(req)
if imageSource == nil {
ErrorReply(req, w, ErrMissingImageSource, o)
return
}
buf, err := imageSource.GetImage(req)
if err != nil {
ErrorReply(req, w, NewError(err.Error(), BadRequest), o)
return
}
if len(buf) == 0 {
ErrorReply(req, w, ErrEmptyBody, o)
return
}
imageHandler(w, req, buf, operation, o)
}
}
func imageHandler(w http.ResponseWriter, r *http.Request, buf []byte, Operation Operation, o ServerOptions) {
// Infer the body MIME type via mimesniff algorithm
mimeType := http.DetectContentType(buf)
// If cannot infer the type, infer it via magic numbers
if mimeType == "application/octet-stream" {
kind, err := filetype.Get(buf)
if err == nil && kind.MIME.Value != "" {
mimeType = kind.MIME.Value
}
}
// Infer text/plain responses as potential SVG image
if strings.Contains(mimeType, "text/plain") && len(buf) > 8 {
if bimg.IsSVGImage(buf) {
mimeType = "image/svg+xml"
}
}
// Finally check if image MIME type is supported
if IsImageMimeTypeSupported(mimeType) == false {
ErrorReply(r, w, ErrUnsupportedMedia, o)
return
}
opts := readParams(r.URL.Query())
if opts.Type != "" && ImageType(opts.Type) == 0 {
ErrorReply(r, w, ErrOutputFormat, o)
return
}
image, err := Operation.Run(buf, opts)
if err != nil {
ErrorReply(r, w, NewError("Error while processing the image: "+err.Error(), BadRequest), o)
return
}
w.Header().Set("Content-Type", image.Mime)
w.Write(image.Body)
}
func formController(w http.ResponseWriter, r *http.Request) {
operations := []struct {
name string
method string
args string
}{
{"Resize", "resize", "width=300&height=200&type=jpeg"},
{"Force resize", "resize", "width=300&height=200&force=true"},
{"Crop", "crop", "width=300&quality=95"},
{"Extract", "extract", "top=100&left=100&areawidth=300&areaheight=150"},
{"Enlarge", "enlarge", "width=1440&height=900&quality=95"},
{"Rotate", "rotate", "rotate=180"},
{"Flip", "flip", ""},
{"Flop", "flop", ""},
{"Thumbnail", "thumbnail", "width=100"},
{"Zoom", "zoom", "factor=2&areawidth=300&top=80&left=80"},
{"Color space (black&white)", "resize", "width=400&height=300&colorspace=bw"},
{"Add watermark", "watermark", "textwidth=100&text=Hello&font=sans%2012&opacity=0.5&color=255,200,50"},
{"Convert format", "convert", "type=png"},
{"Image metadata", "info", ""},
}
html := "<html><body>"
for _, form := range operations {
html += fmt.Sprintf(`
<h1>%s</h1>
<form method="POST" action="/%s?%s" enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="Upload" />
</form>`, form.name, form.method, form.args)
}
html += "</body></html>"
w.Header().Set("Content-Type", "text/html")
w.Write([]byte(html))
}