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aah

package module
Version: v0.11.4 Latest Latest
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 Go to latest Published: Aug 28, 2018 License: MIT Imports: 47 Imported by: 0

README

A secure, flexible, rapid Go web framework

Visit aah's official website https://aahframework.org to learn more

Build Status Code Coverage Go Report Card Release Version Godoc Docker Pulls

News

  • v0.11.4 released and tagged on Aug 27, 2018.

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Documentation

Overview

Package aah is A secure, flexible, rapid Go web framework.

Visit: https://aahframework.org to know more.

Index

Constants

View Source 
const (
	// EventOnInit is published once the aah.AppConfig() is loaded. At this stage,
	// only aah.conf config is initialized. App Variables, Routes, i18n, Security,
	// View Engine, Logs and so on will be initialized after this event.
	EventOnInit = "OnInit"

	// EventOnStart is published just before the start of aah Server.
	// The application is completely initialized at this stage. The server
	// is yet to be started.
	EventOnStart = "OnStart"

	// EventOnPreShutdown is published when application receives OS Signals
	// `SIGINT` or `SIGTERM` and before the triggering graceful shutdown. After this
	// event, aah triggers graceful shutdown with config value of
	// `server.timeout.grace_shutdown`.
	EventOnPreShutdown = "OnPreShutdown"

	// EventOnPostShutdown is published just after the successful grace shutdown
	// of aah server and then application does clean exit.
	EventOnPostShutdown = "OnPostShutdown"

	// EventOnRequest is published on each incoming request to the aah server.
	EventOnRequest = "OnRequest"

	// EventOnPreReply is published just before writing a reply/response on the wire.
	// At this point, the response writer is clean. i.e. Headers, Cookies, Redirects,
	// Status Code and Response Body are not written. event is published when
	// before server writes the reply on the wire.
	//
	// Except when
	//
	//   1) `Reply().Done()`,
	//
	//   2) `Reply().Redirect(...)` is called.
	//
	// Refer `aah.Reply().Done()` godoc for more info.
	EventOnPreReply = "OnPreReply"

	// EventOnHeaderReply is published before writing HTTP header Status.
	// At this point, all the headers except the header Status get written on
	// the http.ResponseWriter.
	//
	// Except when
	//
	//   1) `Reply().Done()`,
	//
	//   2) `Reply().Redirect(...)` is called.
	//
	// Refer `aah.Reply().Done()` godoc for more info.
	EventOnHeaderReply = "OnHeaderReply"

	// EventOnPostReply is published right after the response gets written on the
	// wire. We can do nothing about the response, however the context has valuable
	// information such as response bytes size, response status code, etc.
	//
	// Except when
	//
	//   1) `Reply().Done()`,
	//
	//   2) `Reply().Redirect(...)` is called.
	//
	// Refer `aah.Reply().Done()` godoc for more info.
	EventOnPostReply = "OnPostReply"

	// EventOnPreAuth is published just before the Authentication and Authorization.
	EventOnPreAuth = "OnPreAuth"

	// EventOnPostAuth is published once the Authentication and Authorization
	// info gets populated into Subject.
	EventOnPostAuth = "OnPostAuth"
)
View Source 
const (
	// KeyViewArgAuthcInfo key name is used to store `AuthenticationInfo` instance into `ViewArgs`.
	KeyViewArgAuthcInfo = "_aahAuthcInfo"

	// KeyViewArgSubject key name is used to store `Subject` instance into `ViewArgs`.
	KeyViewArgSubject = "_aahSubject"

	// KeyOAuth2Token key name is used to store OAuth2 Access Token into `aah.Context`.
	KeyOAuth2Token = "_aahOAuth2Token"
)
View Source 
const (
	// KeyViewArgRequest key name is used to store HTTP Request instance
	// into `ViewArgs`.
	KeyViewArgRequest = "_aahRequest"
)
View Source 
const Version = "0.11.4"

Version no. of aah framework

Variables

View Source 
var (
	ErrPanicRecovery              = errors.New("aah: panic recovery")
	ErrDomainNotFound             = errors.New("aah: domain not found")
	ErrRouteNotFound              = errors.New("aah: route not found")
	ErrStaticFileNotFound         = errors.New("aah: static file not found")
	ErrControllerOrActionNotFound = errors.New("aah: controller or action not found")
	ErrInvalidRequestParameter    = errors.New("aah: invalid request parameter")
	ErrContentTypeNotAccepted     = errors.New("aah: content type not accepted")
	ErrContentTypeNotOffered      = errors.New("aah: content type not offered")
	ErrHTTPMethodNotAllowed       = errors.New("aah: http method not allowed")
	ErrNotAuthenticated           = errors.New("aah: not authenticated")
	ErrAccessDenied               = errors.New("aah: access denied")
	ErrAuthenticationFailed       = errors.New("aah: authentication failed")
	ErrAuthorizationFailed        = errors.New("aah: authorization failed")
	ErrSessionAuthenticationInfo  = errors.New("aah: session authentication info")
	ErrUnableToGetPrincipal       = errors.New("aah: unable to get principal")
	ErrGeneric                    = errors.New("aah: generic error")
	ErrValidation                 = errors.New("aah: validation error")
	ErrRenderResponse             = errors.New("aah: render response error")
	ErrWriteResponse              = errors.New("aah: write response error")
)

aah errors

View Source 
var (
	// JSONMarshal is used to register external JSON library for Marshalling.
	JSONMarshal func(v interface{}) ([]byte, error)

	// JSONMarshalIndent is used to register external JSON library for Marshal indent.
	JSONMarshalIndent func(v interface{}, prefix, indent string) ([]byte, error)
)

Functions

func ActionMiddleware 

func ActionMiddleware(ctx *Context, m *Middleware)

ActionMiddleware performs 

- Executes Interceptors (Before, Before<ActionName>, After, After<ActionName>,
			Panic, Panic<ActionName>, Finally, Finally<ActionName>)
- Invokes Controller Action

func AddController 

func AddController(c interface{}, methods []*ainsp.Method)

AddController method adds given controller into controller registory.

func AddLoggerHook 

func AddLoggerHook(name string, hook log.HookFunc) error

AddLoggerHook method adds given logger into aah application default logger.

func AddPasswordAlgorithm 

func AddPasswordAlgorithm(name string, encoder acrypto.PasswordEncoder) error

AddPasswordAlgorithm method adds given password algorithm to encoders list. Implementation have to implement interface `PasswordEncoder`.

Then you can use it `security.auth_schemes.*`.

func AddSessionStore 

func AddSessionStore(name string, store session.Storer) error

AddSessionStore method allows you to add custom session store which implements `session.Storer` interface. The `name` parameter is used in aah.conf on `session.store.type = "name"`.

func AddTemplateFunc 

func AddTemplateFunc(funcs template.FuncMap)

AddTemplateFunc method adds template func map into view engine.

func AddValueParser 

func AddValueParser(typ reflect.Type, parser valpar.Parser) error

AddValueParser method adds given custom value parser for the `reflect.Type`

func AddViewEngine 

func AddViewEngine(name string, engine view.Enginer) error

AddViewEngine method adds the given name and view engine to view store.

func AddWebSocket 

func AddWebSocket(w interface{}, methods []*ainsp.Method)

AddWebSocket method adds given WebSocket into WebSocket registry.

func AllAppProfiles 

func AllAppProfiles() []string

AllAppProfiles method returns all the aah application environment profile names.

func AntiCSRFMiddleware 

func AntiCSRFMiddleware(ctx *Context, m *Middleware)

AntiCSRFMiddleware provides feature to prevent Cross-Site Request Forgery (CSRF) attacks.

func AppBaseDir 

func AppBaseDir() string

AppBaseDir method returns the application base or binary's base directory 

For e.g.:
	$GOPATH/src/github.com/user/myproject
	<app/binary/path/base/directory>

func AppConfig 

func AppConfig() *config.Config

AppConfig method returns aah application configuration instance.

func AppDefaultI18nLang 

func AppDefaultI18nLang() string

AppDefaultI18nLang method returns aah application i18n default language if configured other framework defaults to "en".

func AppDesc 

func AppDesc() string

AppDesc method returns aah application friendly description from app config otherwise empty string.

func AppHTTPAddress 

func AppHTTPAddress() string

AppHTTPAddress method returns aah application HTTP address otherwise empty string

func AppHTTPPort 

func AppHTTPPort() string

AppHTTPPort method returns aah application HTTP port number based on `server.port` value. Possible outcomes are user-defined port, `80`, `443` and `8080`.

func AppI18n 

func AppI18n() *i18n.I18n

AppI18n method returns aah application I18n store instance.

func AppI18nLocales 

func AppI18nLocales() []string

AppI18nLocales returns all the loaded locales from i18n store

func AppImportPath 

func AppImportPath() string

AppImportPath method returns the application Go import path.

func AppInstanceName 

func AppInstanceName() string

AppInstanceName method returns aah application instane name from app config `instance_name` otherwise empty string.

func AppIsSSLEnabled 

func AppIsSSLEnabled() bool

AppIsSSLEnabled method returns true if aah application is enabled with SSL otherwise false.

func AppLog 

func AppLog() log.Loggerer

AppLog method return the aah application logger instance.

func AppName 

func AppName() string

AppName method returns aah application name from app config `name` otherwise app name of the base directory.

func AppProfile 

func AppProfile() string

AppProfile returns aah application configuration profile name For e.g.: dev, prod, etc. Default is `dev`

func AppRouter 

func AppRouter() *router.Router

AppRouter method returns aah application router instance.

func AppSSLCert 

func AppSSLCert() string

AppSSLCert method returns SSL cert filpath if its configured in aah.conf otherwise empty string.

func AppSSLKey 

func AppSSLKey() string

AppSSLKey method returns SSL key filepath if its configured in aah.conf otherwise empty string.

func AppSecurityManager 

func AppSecurityManager() *security.Manager

AppSecurityManager method returns the application security instance, which manages the Session, CORS, CSRF, Security Headers, etc.

func AppSessionManager 

func AppSessionManager() *session.Manager

AppSessionManager method returns the application session manager. By default session is stateless.

func AppVFS 

func AppVFS() *vfs.VFS

AppVFS method returns aah Virtual FileSystem instance.

func AppViewEngine 

func AppViewEngine() view.Enginer

AppViewEngine method returns aah application view Engine instance.

func AppVirtualBaseDir 

func AppVirtualBaseDir() string

AppVirtualBaseDir method returns "/app". In `v0.11.0` Virtual FileSystem (VFS) introduced in aah to provide single binary build packaging and provides seamless experience of Read-Only access to application directory and its sub-tree across OS platforms via `aah.AppVFS()`.

func AppWSEngine 

func AppWSEngine() *ws.Engine

AppWSEngine method returns aah WebSocket engine.

Note: It could be nil if WebSocket is not enabled.

func AuthcAuthzMiddleware 

func AuthcAuthzMiddleware(ctx *Context, m *Middleware)

AuthcAuthzMiddleware is aah Authentication and Authorization Middleware.

func BindMiddleware 

func BindMiddleware(ctx *Context, m *Middleware)

BindMiddleware method parses the incoming HTTP request to collects request parameters (Path, Form, Query, Multipart) stores into context. Request params are made available in View via template functions.

func CORSMiddleware 

func CORSMiddleware(ctx *Context, m *Middleware)

CORSMiddleware provides Cross-Origin Resource Sharing (CORS) access control feature.

func Init 

func Init(importPath string) error

Init method initializes `aah` application, if anything goes wrong during initialize process, it will log it as fatal msg and exit.

func NewChildLogger 

func NewChildLogger(fields log.Fields) log.Loggerer

NewChildLogger method create a child logger from aah application default logger.

func OnInit 

func OnInit(ecb EventCallbackFunc, priority ...int)

OnInit method is to subscribe to aah application `OnInit` event. `OnInit` event published right after the aah application configuration `aah.conf` initialized.

func OnPostShutdown 

func OnPostShutdown(ecb EventCallbackFunc, priority ...int)

OnPostShutdown method is to subscribe to aah application `OnPostShutdown` event. `OnPostShutdown` event pubished right the successful grace shutdown of aah server.

func OnPreShutdown 

func OnPreShutdown(ecb EventCallbackFunc, priority ...int)

OnPreShutdown method is to subscribe to aah application `OnPreShutdown` event. `OnPreShutdown` event pubished right before the triggering aah server graceful shutdown.

func OnStart 

func OnStart(ecb EventCallbackFunc, priority ...int)

OnStart method is to subscribe to aah application `OnStart` event. `OnStart` event pubished right before the aah server starts listening to the request.

func PublishEvent 

func PublishEvent(eventName string, data interface{})

PublishEvent method publishes events to subscribed callbacks asynchronously. It means each subscribed callback executed via goroutine.

func PublishEventSync 

func PublishEventSync(eventName string, data interface{})

PublishEventSync method publishes events to subscribed callbacks synchronously.

func RouteMiddleware 

func RouteMiddleware(ctx *Context, m *Middleware)

RouteMiddleware method performs the routing logic.

func SetAppBuildInfo 

func SetAppBuildInfo(bi *BuildInfo)

SetAppBuildInfo method sets the user application build info into aah instance.

func SetAppPackaged 

func SetAppPackaged(pack bool)

SetAppPackaged method sets the info of binary is packaged or not.

It is used by framework during application startup. IT'S NOT FOR AAH USER(S).

func SetAppProfile 

func SetAppProfile(profile string) error

SetAppProfile method sets given profile as current aah application profile. 

For Example:

aah.SetAppProfile("prod")

func SetErrorHandler 

func SetErrorHandler(handlerFunc ErrorHandlerFunc)

SetErrorHandler method is used to register custom centralized application error handler. If custom handler is not then default error handler takes place.

func SetMinifier 

func SetMinifier(fn MinifierFunc)

SetMinifier method sets the given minifier func into aah framework. Note: currently minifier is called only for HTML contentType.

func SetTLSConfig 

func SetTLSConfig(tlsCfg *tls.Config)

SetTLSConfig method is used to set custom TLS config for aah server. Note: if `server.ssl.lets_encrypt.enable=true` then framework sets the `GetCertificate` from autocert manager.

Use `aah.OnInit` or `func init() {...}` to assign your custom TLS Config.

func Shutdown 

func Shutdown()

Shutdown method allows aah server to shutdown gracefully with given timeout in seconds. It's invoked on OS signal `SIGINT` and `SIGTERM`.

Method performs: 

- Graceful server shutdown with timeout by `server.timeout.grace_shutdown`
- Publishes `OnPostShutdown` event
- Exits program with code 0

func Start 

func Start()

Start method starts the Go HTTP server based on aah config "server.*".

func SubscribeEvent 

func SubscribeEvent(eventName string, ec EventCallback)

SubscribeEvent method is to subscribe to new or existing event.

func SubscribeEventFunc 

func SubscribeEventFunc(eventName string, ecf EventCallbackFunc)

SubscribeEventFunc method is to subscribe to new or existing event by `EventCallbackFunc`.

func UnsubscribeEvent 

func UnsubscribeEvent(eventName string, ec EventCallback)

UnsubscribeEvent method is to unsubscribe by event name and `EventCallback` from app event store.

func UnsubscribeEventFunc 

func UnsubscribeEventFunc(eventName string, ecf EventCallbackFunc)

UnsubscribeEventFunc method is to unsubscribe by event name and `EventCallbackFunc` from app event store.

func Validate 

func Validate(s interface{}) (validator.ValidationErrors, error)

Validate method is to validate struct via underneath validator.

Returns: 

- For validation errors: returns `validator.ValidationErrors` and nil

- For invalid input: returns nil, error (invalid input such as nil, non-struct, etc.)

- For no validation errors: nil, nil

func ValidateValue 

func ValidateValue(v interface{}, rules string) bool

ValidateValue method is to validate individual value on demand.

Returns - 

- true: validation passed

- false: validation failed

For example: 

i := 15
result := valpar.ValidateValue(i, "gt=1,lt=10")

emailAddress := "sample@sample"
result := valpar.ValidateValue(emailAddress, "email")

numbers := []int{23, 67, 87, 23, 90}
result := valpar.ValidateValue(numbers, "unique")

func Validator 

func Validator() *validator.Validate

Validator method return the default validator of aah framework.

Refer to https://godoc.org/gopkg.in/go-playground/validator.v9 for detailed documentation.

Types

type BuildInfo 

type BuildInfo struct {
	BinaryName string
	Version    string
	Date       string
}

BuildInfo holds the aah application build information; such as BinaryName, Version and Date.

func AppBuildInfo 

func AppBuildInfo() *BuildInfo

AppBuildInfo method return user application version no.

type Context 

type Context struct {
	// Req is HTTP request instance
	Req *ahttp.Request

	// Res is HTTP response writer compliant.
	//
	// Note 1: It is highly recommended to use `Reply()` builder for
	// composing your response.
	//
	// Note 2: If you're using `cxt.Res` directly, don't forget to call
	// `Reply().Done()`; so that aah will not intervene with your
	// response.
	Res ahttp.ResponseWriter
	// contains filtered or unexported fields
}

Context type for aah framework, gets embedded in application controller.

Note: this is not standard package `context.Context`.

func (*Context) Abort 

func (ctx *Context) Abort()

Abort method sets the abort to true. It means framework will not proceed with next middleware, next interceptor or action based on context it being used. Contexts: 

   1) If it's called in the middleware, then middleware chain stops;
	framework starts processing response.
   2) If it's called in Before interceptor then Before<Action> interceptor,
	mapped <Action>, After<Action> interceptor and After interceptor will not
	execute; framework starts processing response.
   3) If it's called in Mapped <Action> then After<Action> interceptor and
	After interceptor will not execute; framework starts processing response.

func (*Context) AddViewArg 

func (ctx *Context) AddViewArg(key string, value interface{}) *Context

AddViewArg method adds given key and value into `viewArgs`. These view args values accessible on templates. Chained call is possible.

func (*Context) Get 

func (ctx *Context) Get(key string) interface{}

Get method returns the value for the given key, otherwise it returns nil.

func (*Context) IsStaticRoute 

func (ctx *Context) IsStaticRoute() bool

IsStaticRoute method returns true if it's static route otherwise false.

func (*Context) Log 

func (ctx *Context) Log() log.Loggerer

Log method adds field `Request ID` into current log context and returns the logger.

func (*Context) Msg 

func (ctx *Context) Msg(key string, args ...interface{}) string

Msg method returns the i18n value for given key otherwise empty string returned.

func (*Context) Msgl 

func (ctx *Context) Msgl(locale *ahttp.Locale, key string, args ...interface{}) string

Msgl method returns the i18n value for given local and key otherwise empty string returned.

func (*Context) Reply 

func (ctx *Context) Reply() *Reply

Reply method gives you control and convenient way to write a response effectively.

func (*Context) RouteURL 

func (ctx *Context) RouteURL(routeName string, args ...interface{}) string

RouteURL method returns the URL for given route name and args. See `router.Domain.RouteURL` for more information.

func (*Context) RouteURLNamedArgs 

func (ctx *Context) RouteURLNamedArgs(routeName string, args map[string]interface{}) string

RouteURLNamedArgs method returns the URL for given route name and key-value paris. See `router.Domain.RouteURLNamedArgs` for more information.

func (*Context) Session 

func (ctx *Context) Session() *session.Session

Session method always returns `session.Session` object. Use `Session.IsNew` to identify whether sesison is newly created or restored from the request which was already created.

func (*Context) Set 

func (ctx *Context) Set(key string, value interface{})

Set method is used to set value for the given key in the current request flow.

func (*Context) SetMethod 

func (ctx *Context) SetMethod(method string)

SetMethod method is to set the request `Method` to change the behaviour of request routing. Ideal for URL rewrting.

Note: This method only takes effect on `OnRequest` HTTP server event.

func (*Context) SetURL 

func (ctx *Context) SetURL(pathURL string)

SetURL method is to set the request URL to change the behaviour of request routing. Ideal for URL rewrting. URL can be relative or absolute URL.

Note: This method only takes effect on `OnRequest` HTTP server event.

func (*Context) Subdomain 

func (ctx *Context) Subdomain() string

Subdomain method returns the subdomain from the incoming request if available as per routes.conf. Otherwise empty string.

func (*Context) Subject 

func (ctx *Context) Subject() *security.Subject

Subject method the subject (aka application user) of current request.

func (*Context) ViewArgs 

func (ctx *Context) ViewArgs() map[string]interface{}

ViewArgs method returns aah framework and request related info that can be used in template or view rendering, etc.

type Data 

type Data map[string]interface{}

Data type used for convenient data type of map[string]interface{}

func (Data) MarshalXML 

func (d Data) MarshalXML(e *xml.Encoder, start xml.StartElement) error

MarshalXML method is to marshal `aah.Data` into XML.

type Error 

type Error struct {
	Reason  error       `json:"-" xml:"-"`
	Code    int         `json:"code,omitempty" xml:"code,omitempty"`
	Message string      `json:"message,omitempty" xml:"message,omitempty"`
	Data    interface{} `json:"data,omitempty" xml:"data,omitempty"`
}

Error structure is used to represent the error information in aah framework.

func (*Error) Error 

func (e *Error) Error() string

Error method is to comply error interface.

type ErrorHandler 

type ErrorHandler interface {
	// HandleError method is to handle controller specific errors
	//
	//  - Returns `true` if one or more errors are handled. aah just writes the reply on the wire.
	//
	//  - Return `false` if one or more errors could not be handled. aah propagates the error(s)
	// further onto centralized error handler. If not handled, then finally default
	// error handler takes control.
	HandleError(err *Error) bool
}

ErrorHandler is an interface to implement controller level error handling

type ErrorHandlerFunc 

type ErrorHandlerFunc func(ctx *Context, err *Error) bool

ErrorHandlerFunc is a function type. It is used to define a centralized error handler for an application. 

- Returns `true` when one or more errors are handled. aah just writes the reply on the wire.

- Returns `false' when one or more errors could not be handled. aah propagates the error(s)

to default error handler.

type Event 

type Event struct {
	Name string
	Data interface{}
}

Event type holds the details of single event.

type EventCallback 

type EventCallback struct {
	Callback EventCallbackFunc
	CallOnce bool
	// contains filtered or unexported fields
}

EventCallback type is store particular callback in priority for calling sequance.

type EventCallbackFunc 

type EventCallbackFunc func(e *Event)

EventCallbackFunc is signature of event callback function.

type EventCallbacks 

type EventCallbacks []EventCallback

EventCallbacks type is slice of `EventCallback` type.

func (EventCallbacks) Len 

func (ec EventCallbacks) Len() int

Sort interface for EventCallbacks

func (EventCallbacks) Less 

func (ec EventCallbacks) Less(i, j int) bool

func (EventCallbacks) Swap 

func (ec EventCallbacks) Swap(i, j int)

type EventStore 

type EventStore struct {
	// contains filtered or unexported fields
}

EventStore type holds all the events belongs to aah application.

func AppEventStore 

func AppEventStore() *EventStore

AppEventStore method returns aah application event store.

func (*EventStore) IsEventExists 

func (es *EventStore) IsEventExists(eventName string) bool

IsEventExists method returns true if given event is exists in the event store otherwise false.

func (*EventStore) Publish 

func (es *EventStore) Publish(e *Event)

Publish method publishes events to subscribed callbacks asynchronously. It means each subscribed callback executed via goroutine.

func (*EventStore) PublishSync 

func (es *EventStore) PublishSync(e *Event)

PublishSync method publishes events to subscribed callbacks synchronously.

func (*EventStore) Subscribe 

func (es *EventStore) Subscribe(event string, ec EventCallback)

Subscribe method is to subscribe any event with event callback info.

func (*EventStore) SubscriberCount 

func (es *EventStore) SubscriberCount(eventName string) int

SubscriberCount method returns subscriber count for given event name.

func (*EventStore) Unsubscribe 

func (es *EventStore) Unsubscribe(event string, callback EventCallbackFunc)

Unsubscribe method is to unsubscribe any callback from event store by event.

type HTTPEngine 

type HTTPEngine struct {
	// contains filtered or unexported fields
}

HTTPEngine holds the implementation handling HTTP request, response, middlewares, interceptors, etc.

func AppHTTPEngine 

func AppHTTPEngine() *HTTPEngine

AppHTTPEngine method returns aah HTTP engine.

func (*HTTPEngine) Handle 

func (e *HTTPEngine) Handle(w http.ResponseWriter, r *http.Request)

Handle method is HTTP handler for aah application.

func (*HTTPEngine) Log 

func (e *HTTPEngine) Log() log.Loggerer

Log method returns HTTP engine logger.

func (*HTTPEngine) Middlewares 

func (e *HTTPEngine) Middlewares(middlewares ...MiddlewareFunc)

Middlewares method adds given middleware into middleware stack

func (*HTTPEngine) OnHeaderReply 

func (e *HTTPEngine) OnHeaderReply(sef EventCallbackFunc)

OnHeaderReply method is to subscribe to aah HTTP engine `OnHeaderReply` extension point. `OnHeaderReply` called for every reply from aah server. 

	Except when

 		1) `Reply().Done()`,

 		2) `Reply().Redirect(...)` is called.

Refer `aah.Reply().Done()` godoc for more info.

func (*HTTPEngine) OnPostAuth 

func (e *HTTPEngine) OnPostAuth(sef EventCallbackFunc)

OnPostAuth method is to subscribe to aah application `OnPreAuth` event. `OnPostAuth` event pubished right after the aah server authenticates & authorizes an incoming request.

func (*HTTPEngine) OnPostReply 

func (e *HTTPEngine) OnPostReply(sef EventCallbackFunc)

OnPostReply method is to subscribe to aah HTTP engine `OnPostReply` extension point. `OnPostReply` called for every reply from aah server. 

	Except when

 		1) `Reply().Done()`,

 		2) `Reply().Redirect(...)` is called.

Refer `aah.Reply().Done()` godoc for more info.

func (*HTTPEngine) OnPreAuth 

func (e *HTTPEngine) OnPreAuth(sef EventCallbackFunc)

OnPreAuth method is to subscribe to aah application `OnPreAuth` event. `OnPreAuth` event pubished right before the aah server authenticates & authorizes an incoming request.

func (*HTTPEngine) OnPreReply 

func (e *HTTPEngine) OnPreReply(sef EventCallbackFunc)

OnPreReply method is to subscribe to aah HTTP engine `OnPreReply` extension point. `OnPreReply` called for every reply from aah server. 

	Except when

 		1) `Reply().Done()`,

 		2) `Reply().Redirect(...)` is called.

Refer `aah.Reply().Done()` godoc for more info.

func (*HTTPEngine) OnRequest 

func (e *HTTPEngine) OnRequest(sef EventCallbackFunc)

OnRequest method is to subscribe to aah HTTP engine `OnRequest` extension point. `OnRequest` called for every incoming HTTP request.

The `aah.Context` object passed to the extension functions is decorated with the `ctx.SetURL()` and `ctx.SetMethod()` methods. Calls to these methods will impact how the request is routed and can be used for rewrite rules.

Note: Route is not yet populated/evaluated at this point.

type Middleware 

type Middleware struct {
	// contains filtered or unexported fields
}

Middleware struct is to implement aah framework middleware chain.

func (*Middleware) Next 

func (mw *Middleware) Next(ctx *Context)

Next method calls next middleware in the chain if available.

type MiddlewareFunc 

type MiddlewareFunc func(ctx *Context, m *Middleware)

MiddlewareFunc func type is aah framework middleware signature.

func ToMiddleware 

func ToMiddleware(handler interface{}) MiddlewareFunc

ToMiddleware method expands the possibilities. It helps aah users to register the third-party or your own net/http middleware into `aah.MiddlewareFunc`.

It is highly recommened refactored to `aah.MiddlewareFunc`. 

You can register below handler types:

  1) aah.ToMiddleware(h http.Handler)

  2) aah.ToMiddleware(h http.HandlerFunc)

  3) aah.ToMiddleware(func(w http.ResponseWriter, r *http.Request))

type MinifierFunc 

type MinifierFunc func(contentType string, w io.Writer, r io.Reader) error

MinifierFunc is to minify the HTML buffer and write the response into writer.

type Render 

type Render interface {
	Render(io.Writer) error
}

Render interface to various rendering classifcation for HTTP responses.

type RenderFunc 

type RenderFunc func(w io.Writer) error

RenderFunc type is an adapter to allow the use of regular function as custom Render.

func (RenderFunc) Render 

func (rf RenderFunc) Render(w io.Writer) error

Render method is implementation of Render interface in the adapter type.

type Reply 

type Reply struct {
	Rdr      Render
	Code     int
	ContType string
	// contains filtered or unexported fields
}

Reply gives you control and convenient way to write a response effectively.

func (*Reply) Accepted 

func (r *Reply) Accepted() *Reply

Accepted method sets the HTTP Code as 202 RFC 7231, 6.3.3.

func (*Reply) BadRequest 

func (r *Reply) BadRequest() *Reply

BadRequest method sets the HTTP Code as 400 RFC 7231, 6.5.1.

func (*Reply) Binary 

func (r *Reply) Binary(b []byte) *Reply

Binary method writes given bytes into response. It auto-detects the content type of the given bytes if header `Content-Type` is not set.

func (*Reply) Body 

func (r *Reply) Body() *bytes.Buffer

Body method returns the response body buffer. 

It might be nil if the -

  1) Response was written successfully on the wire

  2) Response is not yet rendered

  3) Static files, since response is written via `http.ServeContent`

func (*Reply) Conflict 

func (r *Reply) Conflict() *Reply

Conflict method sets the HTTP Code as 409 RFC 7231, 6.5.8.

func (*Reply) ContentType 

func (r *Reply) ContentType(contentType string) *Reply

ContentType method sets given Content-Type string for the response. Also Reply instance provides easy to use method for very frequently used Content-Type(s).

By default aah framework try to determine response 'Content-Type' from 'ahttp.Request.AcceptContentType()'.

func (*Reply) Cookie 

func (r *Reply) Cookie(cookie *http.Cookie) *Reply

Cookie method adds the give HTTP cookie into response.

func (*Reply) Created 

func (r *Reply) Created() *Reply

Created method sets the HTTP Code as 201 RFC 7231, 6.3.2.

func (*Reply) DisableGzip 

func (r *Reply) DisableGzip() *Reply

DisableGzip method allows you disable Gzip for the reply. By default every response is gzip compressed if the client supports it and gzip enabled in app config.

func (*Reply) Done 

func (r *Reply) Done() *Reply

Done method is used to indicate response has already been written using `aah.Context.Res` so no further action is needed from framework.

Note: Framework doesn't intervene with response if this method called by aah user.

func (*Reply) Error 

func (r *Reply) Error(err *Error) *Reply

Error method is used send an error reply, which is handled by aah error handling mechanism.

More Info: https://docs.aahframework.org/error-handling.html

func (*Reply) File 

func (r *Reply) File(file string) *Reply

File method send the given as file to client. It auto-detects the content type of the file if `Content-Type` is not set.

Note: If give filepath is relative path then application base directory is used as prefix.

func (*Reply) FileDownload 

func (r *Reply) FileDownload(file, targetName string) *Reply

FileDownload method send the given as file to client as a download. It sets the `Content-Disposition` as `attachment` with given target name and auto-detects the content type of the file if `Content-Type` is not set.

func (*Reply) FileInline 

func (r *Reply) FileInline(file, targetName string) *Reply

FileInline method send the given as file to client to display. For e.g.: display within the browser. It sets the `Content-Disposition` as `inline` with given target name and auto-detects the content type of the file if `Content-Type` is not set.

func (*Reply) Forbidden 

func (r *Reply) Forbidden() *Reply

Forbidden method sets the HTTP Code as 403 RFC 7231, 6.5.3.

func (*Reply) Found 

func (r *Reply) Found() *Reply

Found method sets the HTTP Code as 302 RFC 7231, 6.4.3.

func (*Reply) FromReader 

func (r *Reply) FromReader(reader io.Reader) *Reply

FromReader method reads the data from given reader and writes into response. It auto-detects the content type of the file if `Content-Type` is not set.

Note: Method will close the reader after serving if it's satisfies the `io.Closer`.

func (*Reply) HTML 

func (r *Reply) HTML(data Data) *Reply

HTML method renders given data with auto mapped template name and layout by framework. Also it sets HTTP 'Content-Type' as 'text/html; charset=utf-8'.

aah renders the view template based on -

1) path 'Namespace/Sub-package' of Controller,

2) path 'Controller.Action',

3) view extension 'view.ext' and

4) case sensitive 'view.case_sensitive' from aah.conf

5) default layout is 'master.html' 

For e.g.:
  Namespace/Sub-package: frontend
  Controller: App
  Action: Login
  view.ext: html

  Outcome view template path => /views/pages/frontend/app/login.html

func (*Reply) HTMLf 

func (r *Reply) HTMLf(filename string, data Data) *Reply

HTMLf method renders based on given filename and data. Refer `Reply.HTML(...)` method.

func (*Reply) HTMLl 

func (r *Reply) HTMLl(layout string, data Data) *Reply

HTMLl method renders based on given layout and data. Refer `Reply.HTML(...)` method.

func (*Reply) HTMLlf 

func (r *Reply) HTMLlf(layout, filename string, data Data) *Reply

HTMLlf method renders based on given layout, filename and data. Refer `Reply.HTML(...)` method.

func (*Reply) Header 

func (r *Reply) Header(key, value string) *Reply

Header method sets the given header and value for the response. If value == "", then this method deletes the header.

Note: It overwrites existing header value if it's present.

func (*Reply) HeaderAppend 

func (r *Reply) HeaderAppend(key, value string) *Reply

HeaderAppend method appends the given header and value for the response.

Note: It just appends to it. It does not overwrite existing header.

func (*Reply) InternalServerError 

func (r *Reply) InternalServerError() *Reply

InternalServerError method sets the HTTP Code as 500 RFC 7231, 6.6.1.

func (*Reply) IsContentTypeSet 

func (r *Reply) IsContentTypeSet() bool

IsContentTypeSet method returns true if Content-Type is set otherwise false.

func (*Reply) JSON 

func (r *Reply) JSON(data interface{}) *Reply

JSON method renders given data as JSON response and it sets HTTP 'Content-Type' as 'application/json; charset=utf-8'.

func (*Reply) JSONP 

func (r *Reply) JSONP(data interface{}, callback string) *Reply

JSONP method renders given data as JSONP response with callback and it sets HTTP 'Content-Type' as 'application/javascript; charset=utf-8'.

func (*Reply) JSONSecure 

func (r *Reply) JSONSecure(data interface{}) *Reply

JSONSecure method renders given data as Secure JSON into response. and it sets HTTP 'Content-Type' as 'application/json; charset=utf-8'.

See config `render.secure_json.prefix`.

func (*Reply) MethodNotAllowed 

func (r *Reply) MethodNotAllowed() *Reply

MethodNotAllowed method sets the HTTP Code as 405 RFC 7231, 6.5.5.

func (*Reply) MovedPermanently 

func (r *Reply) MovedPermanently() *Reply

MovedPermanently method sets the HTTP Code as 301 RFC 7231, 6.4.2.

func (*Reply) NoContent 

func (r *Reply) NoContent() *Reply

NoContent method sets the HTTP Code as 204 RFC 7231, 6.3.5.

func (*Reply) NotAcceptable 

func (r *Reply) NotAcceptable() *Reply

NotAcceptable method sets the HTTP Code as 406 RFC 7231, 6.5.6

func (*Reply) NotFound 

func (r *Reply) NotFound() *Reply

NotFound method sets the HTTP Code as 404 RFC 7231, 6.5.4.

func (*Reply) Ok 

func (r *Reply) Ok() *Reply

Ok method sets the HTTP Code as 200 RFC 7231, 6.3.1.

func (*Reply) Redirect 

func (r *Reply) Redirect(redirectURL string) *Reply

Redirect method redirects to given redirect URL with status 302.

func (*Reply) RedirectWithStatus 

func (r *Reply) RedirectWithStatus(redirectURL string, code int) *Reply

RedirectWithStatus method redirects to given redirect URL and status code.

func (*Reply) Render 

func (r *Reply) Render(rdr Render) *Reply

Render method is used render custom implementation using interface `aah.Render`.

func (*Reply) ServiceUnavailable 

func (r *Reply) ServiceUnavailable() *Reply

ServiceUnavailable method sets the HTTP Code as 503 RFC 7231, 6.6.4.

func (*Reply) Status 

func (r *Reply) Status(code int) *Reply

Status method sets the HTTP Code code for the response. Also Reply instance provides easy to use method for very frequently used HTTP Status Codes reference: http://www.restapitutorial.com/httpCodecodes.html

func (*Reply) TemporaryRedirect 

func (r *Reply) TemporaryRedirect() *Reply

TemporaryRedirect method sets the HTTP Code as 307 RFC 7231, 6.4.7.

func (*Reply) Text 

func (r *Reply) Text(format string, values ...interface{}) *Reply

Text method renders given data as Plain Text response with given values and it sets HTTP Content-Type as 'text/plain; charset=utf-8'.

func (*Reply) Unauthorized 

func (r *Reply) Unauthorized() *Reply

Unauthorized method sets the HTTP Code as 401 RFC 7235, 3.1.

func (*Reply) UnsupportedMediaType 

func (r *Reply) UnsupportedMediaType() *Reply

UnsupportedMediaType method sets the HTTP Code as 415 RFC 7231, 6.5.13

func (*Reply) XML 

func (r *Reply) XML(data interface{}) *Reply

XML method renders given data as XML response and it sets HTTP Content-Type as 'application/xml; charset=utf-8'.

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