roulette/types/images.go

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/*
Copyright © 2023 Seednode <seednode@seedno.de>
*/
package types
import (
"errors"
"fmt"
"image"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
"os"
"strings"
_ "golang.org/x/image/bmp"
_ "golang.org/x/image/webp"
)
type Dimensions struct {
Width int
Height int
}
type Images struct{}
func (t Images) Css() string {
var css strings.Builder
css.WriteString(`html,body{margin:0;padding:0;height:100%;}`)
css.WriteString(`a{color:inherit;display:block;height:100%;width:100%;text-decoration:none;}`)
css.WriteString(`img{margin:auto;display:block;max-width:97%;max-height:97%;`)
css.WriteString(`object-fit:scale-down;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);}`)
return css.String()
}
func (t Images) Title(queryParams, fileUri, filePath, fileName, mime string) string {
dimensions, err := ImageDimensions(filePath)
if err != nil {
fmt.Println(err)
}
return fmt.Sprintf(`<title>%s (%dx%d)</title>`,
fileName,
dimensions.Width,
dimensions.Height)
}
func (t Images) Body(queryParams, fileUri, filePath, fileName, mime string) string {
dimensions, err := ImageDimensions(filePath)
if err != nil {
fmt.Println(err)
}
return fmt.Sprintf(`<a href="/%s"><img src="%s" width="%d" height="%d" type="%s" alt="Roulette selected: %s"></a>`,
queryParams,
fileUri,
dimensions.Width,
dimensions.Height,
mime,
fileName)
}
func (t Images) Extensions() map[string]string {
return map[string]string{
`.apng`: `image/apng`,
`.avif`: `image/avif`,
`.bmp`: `image/bmp`,
`.gif`: `image/gif`,
`.jpg`: `image/jpeg`,
`.jpeg`: `image/jpeg`,
`.jfif`: `image/jpeg`,
`.pjp`: `image/jpeg`,
`.pjpeg`: `image/jpeg`,
`.png`: `image/png`,
`.svg`: `image/svg+xml`,
`.webp`: `image/webp`,
}
}
func (t Images) MimeTypes() []string {
return []string{
`image/apng`,
`image/avif`,
`image/bmp`,
`image/gif`,
`image/jpeg`,
`image/png`,
`image/svg+xml`,
`image/webp`,
}
}
func (t Images) Validate(filePath string) bool {
return true
}
func ImageDimensions(path string) (*Dimensions, error) {
file, err := os.Open(path)
switch {
case errors.Is(err, os.ErrNotExist):
fmt.Printf("File %s does not exist\n", path)
return &Dimensions{}, nil
case err != nil:
fmt.Printf("File %s open returned error: %s\n", path, err)
return &Dimensions{}, err
}
defer file.Close()
decodedConfig, _, err := image.DecodeConfig(file)
switch {
case errors.Is(err, image.ErrFormat):
fmt.Printf("File %s has invalid image format\n", path)
return &Dimensions{Width: 0, Height: 0}, nil
case err != nil:
fmt.Printf("File %s decode returned error: %s\n", path, err)
return &Dimensions{}, err
}
return &Dimensions{Width: decodedConfig.Width, Height: decodedConfig.Height}, nil
}