forgejo/modules/context/context.go
wxiaoguang dcd3a63128
Move web JSON functions to web context and simplify code (#26132)
The JSONRedirect/JSONOK/JSONError functions were put into "Base" context
incorrectly, it would cause abuse.

Actually, they are for "web context" only, so, move them to the correct
place.

And by the way, use them to simplify old code: +75 -196
2023-07-26 06:04:01 +00:00

240 lines
8 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"html"
"html/template"
"io"
"net/http"
"net/url"
"strings"
"time"
"code.gitea.io/gitea/models/unit"
user_model "code.gitea.io/gitea/models/user"
mc "code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/templates"
"code.gitea.io/gitea/modules/translation"
"code.gitea.io/gitea/modules/web"
"code.gitea.io/gitea/modules/web/middleware"
web_types "code.gitea.io/gitea/modules/web/types"
"gitea.com/go-chi/cache"
"gitea.com/go-chi/session"
)
// Render represents a template render
type Render interface {
TemplateLookup(tmpl string) (templates.TemplateExecutor, error)
HTML(w io.Writer, status int, name string, data any) error
}
// Context represents context of a request.
type Context struct {
*Base
Render Render
PageData map[string]any // data used by JavaScript modules in one page, it's `window.config.pageData`
Cache cache.Cache
Csrf CSRFProtector
Flash *middleware.Flash
Session session.Store
Link string // current request URL (without query string)
Doer *user_model.User // current signed-in user
IsSigned bool
IsBasicAuth bool
ContextUser *user_model.User // the user which is being visited, in most cases it differs from Doer
Repo *Repository
Org *Organization
Package *Package
}
func init() {
web.RegisterResponseStatusProvider[*Context](func(req *http.Request) web_types.ResponseStatusProvider {
return req.Context().Value(WebContextKey).(*Context)
})
}
// TrHTMLEscapeArgs runs ".Locale.Tr()" but pre-escapes all arguments with html.EscapeString.
// This is useful if the locale message is intended to only produce HTML content.
func (ctx *Context) TrHTMLEscapeArgs(msg string, args ...string) string {
trArgs := make([]any, len(args))
for i, arg := range args {
trArgs[i] = html.EscapeString(arg)
}
return ctx.Locale.Tr(msg, trArgs...)
}
type webContextKeyType struct{}
var WebContextKey = webContextKeyType{}
func GetWebContext(req *http.Request) *Context {
ctx, _ := req.Context().Value(WebContextKey).(*Context)
return ctx
}
// ValidateContext is a special context for form validation middleware. It may be different from other contexts.
type ValidateContext struct {
*Base
}
// GetValidateContext gets a context for middleware form validation
func GetValidateContext(req *http.Request) (ctx *ValidateContext) {
if ctxAPI, ok := req.Context().Value(apiContextKey).(*APIContext); ok {
ctx = &ValidateContext{Base: ctxAPI.Base}
} else if ctxWeb, ok := req.Context().Value(WebContextKey).(*Context); ok {
ctx = &ValidateContext{Base: ctxWeb.Base}
} else {
panic("invalid context, expect either APIContext or Context")
}
return ctx
}
// Contexter initializes a classic context for a request.
func Contexter() func(next http.Handler) http.Handler {
rnd := templates.HTMLRenderer()
csrfOpts := CsrfOptions{
Secret: setting.SecretKey,
Cookie: setting.CSRFCookieName,
SetCookie: true,
Secure: setting.SessionConfig.Secure,
CookieHTTPOnly: setting.CSRFCookieHTTPOnly,
Header: "X-Csrf-Token",
CookieDomain: setting.SessionConfig.Domain,
CookiePath: setting.SessionConfig.CookiePath,
SameSite: setting.SessionConfig.SameSite,
}
if !setting.IsProd {
CsrfTokenRegenerationInterval = 5 * time.Second // in dev, re-generate the tokens more aggressively for debug purpose
}
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
base, baseCleanUp := NewBaseContext(resp, req)
ctx := &Context{
Base: base,
Cache: mc.GetCache(),
Link: setting.AppSubURL + strings.TrimSuffix(req.URL.EscapedPath(), "/"),
Render: rnd,
Session: session.GetSession(req),
Repo: &Repository{PullRequest: &PullRequest{}},
Org: &Organization{},
}
defer baseCleanUp()
ctx.Data.MergeFrom(middleware.CommonTemplateContextData())
ctx.Data["Context"] = &ctx
ctx.Data["CurrentURL"] = setting.AppSubURL + req.URL.RequestURI()
ctx.Data["Link"] = ctx.Link
ctx.Data["locale"] = ctx.Locale
// PageData is passed by reference, and it will be rendered to `window.config.pageData` in `head.tmpl` for JavaScript modules
ctx.PageData = map[string]any{}
ctx.Data["PageData"] = ctx.PageData
ctx.Base.AppendContextValue(WebContextKey, ctx)
ctx.Base.AppendContextValueFunc(git.RepositoryContextKey, func() any { return ctx.Repo.GitRepo })
ctx.Csrf = PrepareCSRFProtector(csrfOpts, ctx)
// Get the last flash message from cookie
lastFlashCookie := middleware.GetSiteCookie(ctx.Req, CookieNameFlash)
if vals, _ := url.ParseQuery(lastFlashCookie); len(vals) > 0 {
// store last Flash message into the template data, to render it
ctx.Data["Flash"] = &middleware.Flash{
DataStore: ctx,
Values: vals,
ErrorMsg: vals.Get("error"),
SuccessMsg: vals.Get("success"),
InfoMsg: vals.Get("info"),
WarningMsg: vals.Get("warning"),
}
}
// prepare an empty Flash message for current request
ctx.Flash = &middleware.Flash{DataStore: ctx, Values: url.Values{}}
ctx.Resp.Before(func(resp ResponseWriter) {
if val := ctx.Flash.Encode(); val != "" {
middleware.SetSiteCookie(ctx.Resp, CookieNameFlash, val, 0)
} else if lastFlashCookie != "" {
middleware.SetSiteCookie(ctx.Resp, CookieNameFlash, "", -1)
}
})
// If request sends files, parse them here otherwise the Query() can't be parsed and the CsrfToken will be invalid.
if ctx.Req.Method == "POST" && strings.Contains(ctx.Req.Header.Get("Content-Type"), "multipart/form-data") {
if err := ctx.Req.ParseMultipartForm(setting.Attachment.MaxSize << 20); err != nil && !strings.Contains(err.Error(), "EOF") { // 32MB max size
ctx.ServerError("ParseMultipartForm", err)
return
}
}
httpcache.SetCacheControlInHeader(ctx.Resp.Header(), 0, "no-transform")
ctx.Resp.Header().Set(`X-Frame-Options`, setting.CORSConfig.XFrameOptions)
ctx.Data["CsrfToken"] = ctx.Csrf.GetToken()
ctx.Data["CsrfTokenHtml"] = template.HTML(`<input type="hidden" name="_csrf" value="` + ctx.Data["CsrfToken"].(string) + `">`)
// FIXME: do we really always need these setting? There should be someway to have to avoid having to always set these
ctx.Data["DisableMigrations"] = setting.Repository.DisableMigrations
ctx.Data["DisableStars"] = setting.Repository.DisableStars
ctx.Data["EnableActions"] = setting.Actions.Enabled
ctx.Data["ManifestData"] = setting.ManifestData
ctx.Data["UnitWikiGlobalDisabled"] = unit.TypeWiki.UnitGlobalDisabled()
ctx.Data["UnitIssuesGlobalDisabled"] = unit.TypeIssues.UnitGlobalDisabled()
ctx.Data["UnitPullsGlobalDisabled"] = unit.TypePullRequests.UnitGlobalDisabled()
ctx.Data["UnitProjectsGlobalDisabled"] = unit.TypeProjects.UnitGlobalDisabled()
ctx.Data["UnitActionsGlobalDisabled"] = unit.TypeActions.UnitGlobalDisabled()
ctx.Data["AllLangs"] = translation.AllLangs()
next.ServeHTTP(ctx.Resp, ctx.Req)
})
}
}
// HasError returns true if error occurs in form validation.
// Attention: this function changes ctx.Data and ctx.Flash
func (ctx *Context) HasError() bool {
hasErr, ok := ctx.Data["HasError"]
if !ok {
return false
}
ctx.Flash.ErrorMsg = ctx.GetErrMsg()
ctx.Data["Flash"] = ctx.Flash
return hasErr.(bool)
}
// GetErrMsg returns error message in form validation.
func (ctx *Context) GetErrMsg() string {
msg, _ := ctx.Data["ErrorMsg"].(string)
if msg == "" {
msg = "invalid form data"
}
return msg
}
func (ctx *Context) JSONRedirect(redirect string) {
ctx.JSON(http.StatusOK, map[string]any{"redirect": redirect})
}
func (ctx *Context) JSONOK() {
ctx.JSON(http.StatusOK, map[string]any{"ok": true}) // this is only a dummy response, frontend seldom uses it
}
func (ctx *Context) JSONError(msg string) {
ctx.JSON(http.StatusBadRequest, map[string]any{"errorMessage": msg})
}