mirror of
https://github.com/kataras/iris.git
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3fa022738b
after the quick start details, so it is visible always Former-commit-id: 0c13135a01c2b883aa4a9629a507aaf622d22ade
96 lines
2.3 KiB
Go
96 lines
2.3 KiB
Go
package main
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import "github.com/kataras/iris/v12"
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func main() {
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app := iris.New()
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app.Use(RoleMiddleware)
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app.Get("/", commonHandler)
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c := app.ConfigureContainer()
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/*
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When you do NOT have access to the middleware code itself
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then you can register a request dependency
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which retrieves the value from the Context
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and returns it, so handler/function's input arguments
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with that `Role` type can be binded.
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c.RegisterDependency(func(ctx iris.Context) Role {
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role, ok := GetRole(ctx)
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if !ok {
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// This codeblock will never be executed here
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// but you can stop executing a handler which depends on
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// that dependency with `ctx.StopExecution/ctx.StopWithXXX` methods
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// or by returning a second output argument of `error` type.
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ctx.StopExecution()
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return Role{}
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}
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return role
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})
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*/
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c.Get("/dep", handlerWithDependencies)
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// http://localhost:8080?name=kataras
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// http://localhost:8080/dep?name=kataras
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app.Listen(":8080")
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}
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func commonHandler(ctx iris.Context) {
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role, _ := GetRole(ctx)
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ctx.WriteString(role.Name)
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}
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func handlerWithDependencies(role Role) string {
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return role.Name
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}
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// Code for an example middleware.
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// Role struct value example.
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type Role struct {
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Name string
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}
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const roleContextKey = "myapp.role"
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// RoleMiddleware example of a custom middleware.
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func RoleMiddleware(ctx iris.Context) {
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// [do it yourself: extract the role from the request...]
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if ctx.URLParam("name") != "kataras" {
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ctx.StopWithStatus(iris.StatusUnauthorized)
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return
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}
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//
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role := Role{Name: "admin"}
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ctx.Values().Set(roleContextKey, role)
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// When you have access to the middleware itself:
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// Use the `RegisterDependency` to register
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// struct type values as dependencies at request-time for
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// any potential dependency injection-ed user handler.
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// This way the user of your middleware can get rid of
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// manually register a dependency for that `Role` type with calls of
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// `APIContainer.RegisterDependency` (and `mvc.Application.Register`).
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ctx.RegisterDependency(role)
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ctx.Next()
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}
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// GetRole returns the role inside the context values,
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// the `roleMiddleware` should be executed first.
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func GetRole(ctx iris.Context) (Role, bool) {
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v := ctx.Values().Get(roleContextKey)
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if v != nil {
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if role, ok := v.(Role); ok {
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return role, true
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}
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}
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return Role{}, false
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}
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// End Code of our example middleware.
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