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github.com/kataras/iris/v12/sessions

package sessions

v12.1.8
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Published: Feb 16, 2020 | License: BSD-3-Clause | Module: github.com/kataras/iris/v12

Index

Constants

const (
	// DefaultCookieName the secret cookie's name for sessions
	DefaultCookieName = "irissessionid"
)

Variables

var (
	// CookieExpireDelete may be set on Cookie.Expire for expiring the given cookie.
	CookieExpireDelete = time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)

	// CookieExpireUnlimited indicates that the cookie doesn't expire.
	CookieExpireUnlimited = time.Now().AddDate(24, 10, 10)
)
var ErrNotFound = errors.New("session not found")

ErrNotFound may be returned from `UpdateExpiration` of a non-existing or invalid session entry from memory storage or databases. Usage: if err != nil && err.Is(err, sessions.ErrNotFound) {

[handle error...]

}

var ErrNotImplemented = errors.New("not implemented yet")

ErrNotImplemented is returned when a particular feature is not yet implemented yet. It can be matched directly, i.e: `isNotImplementedError := sessions.ErrNotImplemented.Equal(err)`.

func AddCookie

func AddCookie(ctx context.Context, cookie *http.Cookie, reclaim bool)

AddCookie adds a cookie

func GetCookie

func GetCookie(ctx context.Context, name string) string

GetCookie returns cookie's value by it's name returns empty string if nothing was found

func IsValidCookieDomain

func IsValidCookieDomain(domain string) bool

IsValidCookieDomain returns true if the receiver is a valid domain to set valid means that is recognised as 'domain' by the browser, so it(the cookie) can be shared with subdomains also

func RemoveCookie

func RemoveCookie(ctx context.Context, config Config)

RemoveCookie deletes a cookie by it's name/key If "purge" is true then it removes the, temp, cookie from the request as well.

type Config

type Config struct {
	// Cookie string, the session's client cookie name, for example: "mysessionid"
	//
	// Defaults to "irissessionid".
	Cookie string

	// CookieSecureTLS set to true if server is running over TLS
	// and you need the session's cookie "Secure" field to be set true.
	//
	// Note: The user should fill the Decode configuation field in order for this to work.
	// Recommendation: You don't need this to be set to true, just fill the Encode and Decode fields
	// with a third-party library like secure cookie, example is provided at the _examples folder.
	//
	// Defaults to false.
	CookieSecureTLS bool

	// AllowReclaim will allow to
	// Destroy and Start a session in the same request handler.
	// All it does is that it removes the cookie for both `Request` and `ResponseWriter` while `Destroy`
	// or add a new cookie to `Request` while `Start`.
	//
	// Defaults to false.
	AllowReclaim bool

	// Encode the cookie value if not nil.
	// Should accept as first argument the cookie name (config.Cookie)
	//         as second argument the server's generated session id.
	// Should return the new session id, if error the session id set to empty which is invalid.
	//
	// Note: Errors are not printed, so you have to know what you're doing,
	// and remember: if you use AES it only supports key sizes of 16, 24 or 32 bytes.
	// You either need to provide exactly that amount or you derive the key from what you type in.
	//
	// Defaults to nil.
	Encode func(cookieName string, value interface{}) (string, error)
	// Decode the cookie value if not nil.
	// Should accept as first argument the cookie name (config.Cookie)
	//               as second second accepts the client's cookie value (the encoded session id).
	// Should return an error if decode operation failed.
	//
	// Note: Errors are not printed, so you have to know what you're doing,
	// and remember: if you use AES it only supports key sizes of 16, 24 or 32 bytes.
	// You either need to provide exactly that amount or you derive the key from what you type in.
	//
	// Defaults to nil.
	Decode func(cookieName string, cookieValue string, v interface{}) error

	// Encoding same as Encode and Decode but receives a single instance which
	// completes the "CookieEncoder" interface, `Encode` and `Decode` functions.
	//
	// Defaults to nil.
	Encoding Encoding

	// Expires the duration of which the cookie must expires (created_time.Add(Expires)).
	// If you want to delete the cookie when the browser closes, set it to -1.
	//
	// 0 means no expire, (24 years)
	// -1 means when browser closes
	// > 0 is the time.Duration which the session cookies should expire.
	//
	// Defaults to infinitive/unlimited life duration(0).
	Expires time.Duration

	// SessionIDGenerator can be set to a function which
	// return a unique session id.
	// By default we will use a uuid impl package to generate
	// that, but developers can change that with simple assignment.
	SessionIDGenerator func(ctx context.Context) string

	// DisableSubdomainPersistence set it to true in order dissallow your subdomains to have access to the session cookie
	//
	// Defaults to false.
	DisableSubdomainPersistence bool
}

Config is the configuration for sessions. Please read it before using sessions.

func (Config) Validate

func (c Config) Validate() Config

Validate corrects missing fields configuration fields and returns the right configuration

type Database

type Database interface {
	// Acquire receives a session's lifetime from the database,
	// if the return value is LifeTime{} then the session manager sets the life time based on the expiration duration lives in configuration.
	Acquire(sid string, expires time.Duration) LifeTime
	// OnUpdateExpiration should re-set the expiration (ttl) of the session entry inside the database,
	// it is fired on `ShiftExpiration` and `UpdateExpiration`.
	// If the database does not support change of ttl then the session entry will be cloned to another one
	// and the old one will be removed, it depends on the chosen database storage.
	//
	// Check of error is required, if error returned then the rest session's keys are not proceed.
	//
	// If a database does not support this feature then an `ErrNotImplemented` will be returned instead.
	OnUpdateExpiration(sid string, newExpires time.Duration) error
	// Set sets a key value of a specific session.
	// The "immutable" input argument depends on the store, it may not implement it at all.
	Set(sid string, lifetime LifeTime, key string, value interface{}, immutable bool)
	// Get retrieves a session value based on the key.
	Get(sid string, key string) interface{}
	// Visit loops through all session keys and values.
	Visit(sid string, cb func(key string, value interface{}))
	// Len returns the length of the session's entries (keys).
	Len(sid string) int
	// Delete removes a session key value based on its key.
	Delete(sid string, key string) (deleted bool)
	// Clear removes all session key values but it keeps the session entry.
	Clear(sid string)
	// Release destroys the session, it clears and removes the session entry,
	// session manager will create a new session ID on the next request after this call.
	Release(sid string)
}

Database is the interface which all session databases should implement By design it doesn't support any type of cookie session like other frameworks. I want to protect you, believe me. The scope of the database is to store somewhere the sessions in order to keep them after restarting the server, nothing more.

Synchronization are made automatically, you can register one using `UseDatabase`.

Look the `sessiondb` folder for databases implementations.

type DestroyListener

type DestroyListener func(sid string)

DestroyListener is the form of a destroy listener. Look `OnDestroy` for more.

type Encoding

type Encoding interface {
	// Encode the cookie value if not nil.
	// Should accept as first argument the cookie name (config.Name)
	//         as second argument the server's generated session id.
	// Should return the new session id, if error the session id set to empty which is invalid.
	//
	// Note: Errors are not printed, so you have to know what you're doing,
	// and remember: if you use AES it only supports key sizes of 16, 24 or 32 bytes.
	// You either need to provide exactly that amount or you derive the key from what you type in.
	//
	// Defaults to nil
	Encode(cookieName string, value interface{}) (string, error)
	// Decode the cookie value if not nil.
	// Should accept as first argument the cookie name (config.Name)
	//               as second second accepts the client's cookie value (the encoded session id).
	// Should return an error if decode operation failed.
	//
	// Note: Errors are not printed, so you have to know what you're doing,
	// and remember: if you use AES it only supports key sizes of 16, 24 or 32 bytes.
	// You either need to provide exactly that amount or you derive the key from what you type in.
	//
	// Defaults to nil
	Decode(cookieName string, cookieValue string, v interface{}) error
}

Encoding is the Cookie Encoder/Decoder interface, which can be passed as configuration field alternatively to the `Encode` and `Decode` fields.

type ErrEntryNotFound

type ErrEntryNotFound struct {
	Err   *memstore.ErrEntryNotFound
	Value interface{}
}

ErrEntryNotFound similar to core/memstore#ErrEntryNotFound but adds the value (if found) matched to the requested key-value pair of the session's memory storage.

func (*ErrEntryNotFound) As

func (e *ErrEntryNotFound) As(target interface{}) bool

As method implements the dynamic As interface of the std errors package. As should be NOT used directly, use `errors.As` instead.

func (*ErrEntryNotFound) Error

func (e *ErrEntryNotFound) Error() string

func (*ErrEntryNotFound) Unwrap

func (e *ErrEntryNotFound) Unwrap() error

Unwrap method implements the dynamic Unwrap interface of the std errors package.

type LifeTime

type LifeTime struct {
	// Remember, tip for the future:
	// No need of gob.Register, because we embed the time.Time.
	// And serious bug which has a result of me spending my whole evening:
	// Because of gob encoding it doesn't encodes/decodes the other fields if time.Time is embedded
	// (this should be a bug(go1.9-rc1) or not. We don't care atm)
	time.Time
	// contains filtered or unexported fields
}

LifeTime controls the session expiration datetime.

func (*LifeTime) Begin

func (lt *LifeTime) Begin(d time.Duration, onExpire func())

Begin will begin the life based on the time.Now().Add(d). Use `Continue` to continue from a stored time(database-based session does that).

func (*LifeTime) DurationUntilExpiration

func (lt *LifeTime) DurationUntilExpiration() time.Duration

DurationUntilExpiration returns the duration until expires, it can return negative number if expired, a call to `HasExpired` may be useful before calling this `Dur` function.

func (*LifeTime) ExpireNow

func (lt *LifeTime) ExpireNow()

ExpireNow reduce the lifetime completely.

func (*LifeTime) HasExpired

func (lt *LifeTime) HasExpired() bool

HasExpired reports whether "lt" represents is expired.

func (*LifeTime) Revive

func (lt *LifeTime) Revive(onExpire func())

Revive will continue the life based on the stored Time. Other words that could be used for this func are: Continue, Restore, Resc.

func (*LifeTime) Shift

func (lt *LifeTime) Shift(d time.Duration)

Shift resets the lifetime based on "d".

type Marshaler

type Marshaler interface {
	Marshal(interface{}) ([]byte, error)
}

Marshaler is the common marshaler interface, used by transcoder.

type Session

type Session struct {
	Lifetime LifeTime
	// contains filtered or unexported fields
}

Session should expose the Sessions's end-user API. It is the session's storage controller which you can save or retrieve values based on a key.

This is what will be returned when sess := sessions.Start().

func Get

func Get(ctx context.Context) *Session

Get returns a *Session from the same request life cycle, can be used inside a chain of handlers of a route.

The `Sessions.Start` should be called previously, e.g. register the `Sessions.Handler` as middleware. Then call `Get` package-level function as many times as you want. The `Sessions.Start` can be called more than one time in the same request life cycle as well.

func (*Session) Clear

func (s *Session) Clear()

Clear removes all entries.

func (*Session) ClearFlashes

func (s *Session) ClearFlashes()

ClearFlashes removes all flash messages.

func (*Session) Decrement

func (s *Session) Decrement(key string, n int) (newValue int)

Decrement decrements the stored int value saved as "key" by -"n". If value doesn't exist on that "key" then it creates one with the "n" as its value. It returns the new, decremented, value even if it's less than zero.

func (*Session) Delete

func (s *Session) Delete(key string) bool

Delete removes an entry by its key, returns true if actually something was removed.

func (*Session) DeleteFlash

func (s *Session) DeleteFlash(key string)

DeleteFlash removes a flash message by its key.

func (*Session) Destroy

func (s *Session) Destroy()

Destroy destroys this session, it removes its session values and any flashes. This session entry will be removed from the server, the registered session databases will be notified for this deletion as well.

Note that this method does NOT remove the client's cookie, although it should be reseted if new session is attached to that (client).

Use the session's manager `Destroy(ctx)` in order to remove the cookie as well.

func (*Session) Get

func (s *Session) Get(key string) interface{}

Get returns a value based on its "key".

func (*Session) GetAll

func (s *Session) GetAll() map[string]interface{}

GetAll returns a copy of all session's values.

func (*Session) GetBoolean

func (s *Session) GetBoolean(key string) (bool, error)

GetBoolean same as `Get` but returns its boolean representation, if key doesn't exist then it returns false and a non-nil error.

func (*Session) GetBooleanDefault

func (s *Session) GetBooleanDefault(key string, defaultValue bool) bool

GetBooleanDefault same as `Get` but returns its boolean representation, if key doesn't exist then it returns the "defaultValue".

func (*Session) GetFlash

func (s *Session) GetFlash(key string) interface{}

GetFlash returns a stored flash message based on its "key" which will be removed on the next request.

To check for flash messages we use the HasFlash() Method and to obtain the flash message we use the GetFlash() Method. There is also a method GetFlashes() to fetch all the messages.

Fetching a message deletes it from the session. This means that a message is meant to be displayed only on the first page served to the user.

func (*Session) GetFlashString

func (s *Session) GetFlashString(key string) string

GetFlashString same as `GetFlash` but returns its string representation, if key doesn't exist then it returns an empty string.

func (*Session) GetFlashStringDefault

func (s *Session) GetFlashStringDefault(key string, defaultValue string) string

GetFlashStringDefault same as `GetFlash` but returns its string representation, if key doesn't exist then it returns the "defaultValue".

func (*Session) GetFlashes

func (s *Session) GetFlashes() map[string]interface{}

GetFlashes returns all flash messages as map[string](key) and interface{} value NOTE: this will cause at remove all current flash messages on the next request of the same user.

func (*Session) GetFloat32

func (s *Session) GetFloat32(key string) (float32, error)

GetFloat32 same as `Get` but returns its float32 representation, if key doesn't exist then it returns -1 and a non-nil error.

func (*Session) GetFloat32Default

func (s *Session) GetFloat32Default(key string, defaultValue float32) float32

GetFloat32Default same as `Get` but returns its float32 representation, if key doesn't exist then it returns the "defaultValue".

func (*Session) GetFloat64

func (s *Session) GetFloat64(key string) (float64, error)

GetFloat64 same as `Get` but returns its float64 representation, if key doesn't exist then it returns -1 and a non-nil error.

func (*Session) GetFloat64Default

func (s *Session) GetFloat64Default(key string, defaultValue float64) float64

GetFloat64Default same as `Get` but returns its float64 representation, if key doesn't exist then it returns the "defaultValue".

func (*Session) GetInt

func (s *Session) GetInt(key string) (int, error)

GetInt same as `Get` but returns its int representation, if key doesn't exist then it returns -1 and a non-nil error.

func (*Session) GetInt64

func (s *Session) GetInt64(key string) (int64, error)

GetInt64 same as `Get` but returns its int64 representation, if key doesn't exist then it returns -1 and a non-nil error.

func (*Session) GetInt64Default

func (s *Session) GetInt64Default(key string, defaultValue int64) int64

GetInt64Default same as `Get` but returns its int64 representation, if key doesn't exist it returns the "defaultValue".

func (*Session) GetIntDefault

func (s *Session) GetIntDefault(key string, defaultValue int) int

GetIntDefault same as `Get` but returns its int representation, if key doesn't exist then it returns the "defaultValue".

func (*Session) GetString

func (s *Session) GetString(key string) string

GetString same as Get but returns its string representation, if key doesn't exist then it returns an empty string.

func (*Session) GetStringDefault

func (s *Session) GetStringDefault(key string, defaultValue string) string

GetStringDefault same as Get but returns its string representation, if key doesn't exist then it returns the "defaultValue".

func (*Session) HasFlash

func (s *Session) HasFlash() bool

HasFlash returns true if this session has available flash messages.

func (*Session) ID

func (s *Session) ID() string

ID returns the session's ID.

func (*Session) Increment

func (s *Session) Increment(key string, n int) (newValue int)

Increment increments the stored int value saved as "key" by +"n". If value doesn't exist on that "key" then it creates one with the "n" as its value. It returns the new, incremented, value.

func (*Session) IsNew

func (s *Session) IsNew() bool

IsNew returns true if this session is created by the current application's process.

func (*Session) Len

func (s *Session) Len() int

Len returns the total number of stored values in this session.

func (*Session) PeekFlash

func (s *Session) PeekFlash(key string) interface{}

PeekFlash returns a stored flash message based on its "key". Unlike GetFlash, this will keep the message valid for the next requests, until GetFlashes or GetFlash("key").

func (*Session) Set

func (s *Session) Set(key string, value interface{})

Set fills the session with an entry "value", based on its "key".

func (*Session) SetFlash

func (s *Session) SetFlash(key string, value interface{})

SetFlash sets a flash message by its key.

A flash message is used in order to keep a message in session through one or several requests of the same user. It is removed from session after it has been displayed to the user. Flash messages are usually used in combination with HTTP redirections, because in this case there is no view, so messages can only be displayed in the request that follows redirection.

A flash message has a name and a content (AKA key and value). It is an entry of an associative array. The name is a string: often "notice", "success", or "error", but it can be anything. The content is usually a string. You can put HTML tags in your message if you display it raw. You can also set the message value to a number or an array: it will be serialized and kept in session like a string.

Flash messages can be set using the SetFlash() Method For example, if you would like to inform the user that his changes were successfully saved, you could add the following line to your Handler:

SetFlash("success", "Data saved!");

In this example we used the key 'success'. If you want to define more than one flash messages, you will have to use different keys.

func (*Session) SetImmutable

func (s *Session) SetImmutable(key string, value interface{})

SetImmutable fills the session with an entry "value", based on its "key". Unlike `Set`, the output value cannot be changed by the caller later on (when .Get) An Immutable entry should be only changed with a `SetImmutable`, simple `Set` will not work if the entry was immutable, for your own safety. Use it consistently, it's far slower than `Set`. Read more about muttable and immutable go types: https://stackoverflow.com/a/8021081

func (*Session) Visit

func (s *Session) Visit(cb func(k string, v interface{}))

Visit loops each of the entries and calls the callback function func(key, value).

type Sessions

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

A Sessions manager should be responsible to Start a sesion, based on a Context, which should return a compatible Session interface, type. If the external session manager doesn't qualifies, then the user should code the rest of the functions with empty implementation.

Sessions should be responsible to Destroy a session based on the Context.

func New

func New(cfg Config) *Sessions

New returns a new fast, feature-rich sessions manager it can be adapted to an iris station

func (*Sessions) Destroy

func (s *Sessions) Destroy(ctx context.Context)

Destroy remove the session data and remove the associated cookie.

func (*Sessions) DestroyAll

func (s *Sessions) DestroyAll()

DestroyAll removes all sessions from the server-side memory (and database if registered). Client's session cookie will still exist but it will be reseted on the next request.

func (*Sessions) DestroyByID

func (s *Sessions) DestroyByID(sid string)

DestroyByID removes the session entry from the server-side memory (and database if registered). Client's session cookie will still exist but it will be reseted on the next request.

It's safe to use it even if you are not sure if a session with that id exists.

Note: the sid should be the original one (i.e: fetched by a store ) it's not decoded.

func (*Sessions) Handler

func (s *Sessions) Handler(cookieOptions ...context.CookieOption) context.Handler

Handler returns a sessions middleware to register on application routes.

func (*Sessions) OnDestroy

func (s *Sessions) OnDestroy(listeners ...DestroyListener)

OnDestroy registers one or more destroy listeners. A destroy listener is fired when a session has been removed entirely from the server (the entry) and client-side (the cookie). Note that if a destroy listener is blocking, then the session manager will delay respectfully, use a goroutine inside the listener to avoid that behavior.

func (*Sessions) ShiftExpiration

func (s *Sessions) ShiftExpiration(ctx context.Context, cookieOptions ...context.CookieOption) error

ShiftExpiration move the expire date of a session to a new date by using session default timeout configuration. It will return `ErrNotImplemented` if a database is used and it does not support this feature, yet.

func (*Sessions) Start

func (s *Sessions) Start(ctx context.Context, cookieOptions ...context.CookieOption) *Session

Start creates or retrieves an existing session for the particular request.

func (*Sessions) StartWithPath

func (s *Sessions) StartWithPath(ctx context.Context, path string) *Session

StartWithPath same as `Start` but it explicitly accepts the cookie path option.

func (*Sessions) UpdateExpiration

func (s *Sessions) UpdateExpiration(ctx context.Context, expires time.Duration, cookieOptions ...context.CookieOption) error

UpdateExpiration change expire date of a session to a new date by using timeout value passed by `expires` receiver. It will return `ErrNotFound` when trying to update expiration on a non-existence or not valid session entry. It will return `ErrNotImplemented` if a database is used and it does not support this feature, yet.

func (*Sessions) UseDatabase

func (s *Sessions) UseDatabase(db Database)

UseDatabase adds a session database to the manager's provider, a session db doesn't have write access

type Transcoder

type Transcoder interface {
	Marshaler
	Unmarshaler
}

Transcoder is the interface that transcoders should implement, it includes just the `Marshaler` and the `Unmarshaler`.

var DefaultTranscoder Transcoder = defaultTranscoder{}

DefaultTranscoder is the default transcoder across databases, it's the JSON by default. Change it if you want a different serialization/deserialization inside your session databases (when `UseDatabase` is used).

type Unmarshaler

type Unmarshaler interface {
	Unmarshal([]byte, interface{}) error
}

Unmarshaler is the common unmarshaler interface, used by transcoder.

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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