import (
    "github.com/insanXYZ/sage"
)

//open file in your pc with os.open
//note : giphy.gif have size 263kb
open, err := os.Open("giphy.gif")
if err != nil {
    fmt.Println(err.Error())
}

//image validation only
err := sage.Validate(open) //not error
if err != nil {
    fmt.Println(err.Error())
}

//validate format 
err := sage.Validate(open, "gif") //not error
if err != nil {
    fmt.Println(err.Error())
}

err = sage.Validate(open, "png") //error
if err != nil {
    fmt.Println(err.Error())
}

//validate size
err := sage.Validate(open, "minsize=100") //not error
if err != nil {
    fmt.Println(err.Error())
}

err = sage.Validate(open, "maxsize=100") //error
if err != nil {
    fmt.Println(err.Error())
}

//validate format and size
err = sage.Validate(open, "gif","minsize=100") //not error
if err != nil {
    fmt.Println(err.Error())
}

import (
    "github.com/insanXYZ/sage"
)

//Echo (https://echo.labstack.com/)
e := echo.New()

e.POST("/image-upload", func(c echo.Context) error {
    file, _ := c.FormFile("image")
    err := sage.Validate(file)
    ...
})

import (
    "github.com/insanXYZ/sage"
)

//Fiber (https://gofiber.io/)
f := fiber.New()

fiber.Post("/image-upload", func(ctx *fiber.Ctx) error {
    file, _ := ctx.FormFile("file")
    err := sage.Validate(file)
    ...
})