func ScaleImage(i image.Image, w, h int) (image.Image, error) 

Usage: To scale an image to specified width and height

Input param:

i: Image need to scale width and height

w: output width

h: output height

func EncodeImage(buf io.Writer, i image.Image, ext string) error

Usage: Write the image i to buf in jpeg, png or gif format

Input param:

buf: writer

i: image need to encode

ext: extension of input image

func GetImageByPath(path string) (draw.Image, string)

Usage: Get the image from specified path

Input param:

path: path of image need to get

func GetImageByPathWithRect(path string, rect image.Rectangle) (draw.Image, string)

Usage: Get the image from specified path and rectangle

Input param:

path: path of image need to get

rect: rectangle of image

type (
	// Pager ...
	Pager struct {
		TotalCount  int64
		PerPage     int64
		CurrentPage int64
		PrevItem    PageItem
		NextItem    PageItem
		PageLinks   []PageItem
	}

	// PageItem ...
	PageItem struct {
		Page       int64
		Label      string
		Location   string
		IsDisabled bool
		IsCurrent  bool
	}
)

func CreatePager(ctx context.Context, count, perpage, current int64) (*Pager, error)

Usage: Create a pagination pager

Input param:

ctx: a context

count: total result

perpage: number result per page

current: current page

func getLocation(location string, page int64) string

Usage: Get location (url) of specified page

Input param:

location: current location

page: specified page need to get location

func paramTo(kind reflect.Kind, param string) (interface{}, bool, error)

Usage: Convert params to a specified type

Input param:

kind: type need to convert to

param: a URL param

func ParamToInt64(param string) (int64, bool, error)

Usage: Convert params to type int64

Input param:

param: a URL param

func ParamToStr(param string) (string, bool, error)

Usage: Convert params to type string

Input param:

param: a URL param

func Random(n int) string

Usage: Make a random string with n characters both uppercase and lowercase

Input param:

n: number of characters

func RandomLC(n int) string

Usage: Make a random string with n lowercase characters

Input param:

n: number of characters

func GetHash256(str string) string

Usage: Encrypt a string using SHA-256 algorithm

Input param:

str: string

func PasswordHash(pw string) (string, error)

Usage: Generate a hash password from password

Input param:

pw: password

func PasswordVerify(hash, pw string) error

Usage: Compare password with hash password to verify

Input param:

hash: hash password

pw: password