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package helper
import (
"image"
"net/http"
)
// Checks if the subreact exists, responds with a bad status when false.
func IsValidSubreact(subreact string, writer http.ResponseWriter) bool {
switch subreact {
case "":
fallthrough
case "t":
fallthrough
case "g":
fallthrough
case "k":
fallthrough
case "p":
fallthrough
case "a":
fallthrough
case "pr":
fallthrough
case "m":
break
default:
WriteErrorJson("invalid subreact", writer, http.StatusBadRequest)
return false
}
return true
}
// Range checks the length of the argument, responds with a bad status when false.
func IsValidRange(str string, name string, min int, max int, writer http.ResponseWriter) bool {
if len(str) < min {
WriteErrorJson(name+" too short", writer, http.StatusBadRequest)
return false
}
if len(str) > max {
WriteErrorJson(name+" too long", writer, http.StatusBadRequest)
return false
}
return true
}
// Checks that the image has supported properties, responds with a bad status when false.
func IsImageSupported(image image.Image, format string, writer http.ResponseWriter) bool {
if bounds := image.Bounds(); bounds.Dx() > 4096 || bounds.Dy() > 4096 {
WriteErrorJson("image dimensions too large", writer, http.StatusBadRequest)
return false
} else if bounds.Dx() < 256 || bounds.Dy() < 256 {
WriteErrorJson("image dimensions too small", writer, http.StatusBadRequest)
return false
}
switch format {
case "png":
fallthrough
case "jpeg":
fallthrough
case "gif":
break
default:
WriteErrorJson("image format no recognised", writer, http.StatusBadRequest)
return false
}
return true
}
|
