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context.go
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context.go
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package view
import (
"bytes"
"container/heap"
"encoding/base64"
"github.com/ungerik/go-start/errs"
"github.com/ungerik/go-start/utils"
"github.com/ungerik/web.go"
"hash/crc32"
"strconv"
"strings"
)
func NewContext(webContext *web.Context, respondingView View, pathArgs []string) *Context {
return &Context{
web.Context: webContext,
RespondingView: respondingView,
PathArgs: pathArgs,
}
}
///////////////////////////////////////////////////////////////////////////////
// Context
// Context holds all data specific to a HTTP request and will be passed to View.Render() methods.
type Context struct {
*web.Context
// View that responds to the HTTP request
RespondingView View
// Arguments parsed from the URL path
PathArgs []string
/*
Cached user object of the session.
User won't be set automatically, use user.OfSession(context) instead.
Example for setting it automatically for every request:
import "github.com/ungerik/go-start/user"
Config.OnPreAuth = func(context *Context) error {
user.OfSession(context) // Sets context.User
return nil
}
*/
User interface{}
// Custom request wide data that can be set by the application
Data interface{}
cachedSessionID string
// cache map[string]interface{}
dynamicStyle dependencyHeap
dynamicHeadScripts dependencyHeap
dynamicScripts dependencyHeap
}
// RequestURL returns the complete URL of the request including protocol and host.
func (self *Context) RequestURL() string {
url := self.Request.RequestURI
if !strings.HasPrefix(url, "http") {
url = "http://" + self.Request.Host + url
}
return url
}
func (self *Context) EncryptCookie(data []byte) (result []byte, err error) {
// todo crypt
e := base64.StdEncoding
result = make([]byte, e.EncodedLen(len(data)))
e.Encode(result, data)
return result, nil
}
func (self *Context) DecryptCookie(data []byte) (result []byte, err error) {
// todo crypt
e := base64.StdEncoding
result = make([]byte, e.DecodedLen(len(data)))
_, err = e.Decode(result, data)
if err != nil {
return nil, err
}
return result, nil
}
// todo: all browsers
func (self *Context) ParseRequestUserAgent() (renderer string, version utils.VersionTuple, err error) {
s := self.Request.UserAgent()
switch {
case strings.Contains(s, "Gecko"):
if i := strings.Index(s, "rv:"); i != -1 {
i += len("rv:")
if l := strings.IndexAny(s[i:], "); "); l != -1 {
if version, err = utils.ParseVersionTuple(s[i : i+l]); err == nil {
return "Gecko", version, nil
}
}
}
case strings.Contains(s, "MSIE "):
if i := strings.Index(s, "MSIE "); i != -1 {
i += len("MSIE ")
if l := strings.IndexAny(s[i:], "); "); l != -1 {
if version, err = utils.ParseVersionTuple(s[i : i+l]); err == nil {
return "MSIE", version, nil
}
}
}
}
return "", nil, nil
}
func (self *Context) RequestPort() uint16 {
i := strings.LastIndex(self.Request.Host, ":")
if i == -1 {
return 80
}
port, _ := strconv.ParseInt(self.Request.Host[i+1:], 10, 16)
return uint16(port)
}
//func (self *Context) Cache(key string, value interface{}) {
// if self.cache == nil {
// self.cache = make(map[string]interface{})
// }
// self.cache[key] = value
//}
//
//func (self *Context) Cached(key string) (value interface{}, ok bool) {
// if self.cache == nil {
// return nil, false
// }
// value, ok = self.cache[key]
// return value, ok
//}
//
//func (self *Context) DeleteCached(key string) {
// if self.cache == nil {
// return
// }
// self.cache[key] = nil, false
//}
// SessionID returns the id of the session and if there is a session active.
func (self *Context) SessionID() (id string, ok bool) {
if self.cachedSessionID != "" {
return self.cachedSessionID, true
}
if Config.SessionTracker == nil {
return "", false
}
self.cachedSessionID, ok = Config.SessionTracker.ID(self)
return self.cachedSessionID, ok
}
func (self *Context) SetSessionID(id string) {
if Config.SessionTracker != nil {
Config.SessionTracker.SetID(self, id)
self.cachedSessionID = id
}
}
func (self *Context) DeleteSessionID() {
self.cachedSessionID = ""
if t := Config.SessionTracker; t != nil {
t.DeleteID(self)
}
}
// SessionData returns all session data in out.
func (self *Context) SessionData(out interface{}) (ok bool, err error) {
if Config.SessionDataStore == nil {
return false, errs.Format("Can't get session data without gostart/views.Config.SessionDataStore")
}
return Config.SessionDataStore.Get(self, out)
}
// SetSessionData sets all session data.
func (self *Context) SetSessionData(data interface{}) (err error) {
if Config.SessionDataStore == nil {
return errs.Format("Can't set session data without gostart/views.Config.SessionDataStore")
}
return Config.SessionDataStore.Set(self, data)
}
// DeleteSessionData deletes all session data.
func (self *Context) DeleteSessionData() (err error) {
if Config.SessionDataStore == nil {
return errs.Format("Can't delete session data without gostart/views.Config.SessionDataStore")
}
return Config.SessionDataStore.Delete(self)
}
func (self *Context) AddStyle(css string, priority int) {
if self.dynamicStyle == nil {
self.dynamicStyle = make(dependencyHeap, 0, 1)
self.dynamicStyle.Init()
}
self.dynamicStyle.AddIfNew("<style>"+css+"</style>", priority)
}
func (self *Context) AddStyleURL(url string, priority int) {
if self.dynamicStyle == nil {
self.dynamicStyle = make(dependencyHeap, 0, 1)
self.dynamicStyle.Init()
}
self.dynamicStyle.AddIfNew("<link rel='stylesheet' href='"+url+"'>", priority)
}
func (self *Context) AddHeaderScript(script string, priority int) {
if self.dynamicHeadScripts == nil {
self.dynamicHeadScripts = make(dependencyHeap, 0, 1)
self.dynamicHeadScripts.Init()
}
self.dynamicHeadScripts.AddIfNew("<script>"+script+"</script>", priority)
}
func (self *Context) AddHeaderScriptURL(url string, priority int) {
if self.dynamicHeadScripts == nil {
self.dynamicHeadScripts = make(dependencyHeap, 0, 1)
self.dynamicHeadScripts.Init()
}
self.dynamicHeadScripts.AddIfNew("<script src='"+url+"'></script>", priority)
}
func (self *Context) AddScript(script string, priority int) {
if self.dynamicScripts == nil {
self.dynamicScripts = make(dependencyHeap, 0, 1)
self.dynamicScripts.Init()
}
self.dynamicScripts.AddIfNew("<script>"+script+"</script>", priority)
}
func (self *Context) AddScriptURL(url string, priority int) {
if self.dynamicScripts == nil {
self.dynamicScripts = make(dependencyHeap, 0, 1)
self.dynamicScripts.Init()
}
self.dynamicScripts.AddIfNew("<script src='"+url+"'></script>", priority)
}
///////////////////////////////////////////////////////////////////////////////
// dependencyHeap
type dependencyHeapItem struct {
text string
hash uint32
priority int
}
type dependencyHeap []dependencyHeapItem
func (self *dependencyHeap) Len() int {
return len(*self)
}
func (self *dependencyHeap) Less(i, j int) bool {
return (*self)[i].priority < (*self)[j].priority
}
func (self *dependencyHeap) Swap(i, j int) {
(*self)[i], (*self)[j] = (*self)[j], (*self)[i]
}
func (self *dependencyHeap) Push(item interface{}) {
*self = append(*self, item.(dependencyHeapItem))
}
func (self *dependencyHeap) Pop() interface{} {
end := len(*self) - 1
item := (*self)[end]
*self = (*self)[:end]
return item
}
func (self *dependencyHeap) Init() {
heap.Init(self)
}
func (self *dependencyHeap) AddIfNew(text string, priority int) {
hash := crc32.ChecksumIEEE([]byte(text))
for i := range *self {
if (*self)[i].hash == hash {
// text is not new
return
}
}
heap.Push(self, dependencyHeapItem{text, hash, priority})
}
func (self *dependencyHeap) String() string {
if self == nil {
return ""
}
var buf bytes.Buffer
for i := range *self {
buf.WriteString((*self)[i].text)
}
return buf.String()
}