forgejo-federation/modules/context/context_response.go

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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"errors"
"fmt"
"net"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/templates"
"code.gitea.io/gitea/modules/web/middleware"
)
// SetTotalCountHeader set "X-Total-Count" header
func (ctx *Context) SetTotalCountHeader(total int64) {
ctx.RespHeader().Set("X-Total-Count", fmt.Sprint(total))
ctx.AppendAccessControlExposeHeaders("X-Total-Count")
}
// AppendAccessControlExposeHeaders append headers by name to "Access-Control-Expose-Headers" header
func (ctx *Context) AppendAccessControlExposeHeaders(names ...string) {
val := ctx.RespHeader().Get("Access-Control-Expose-Headers")
if len(val) != 0 {
ctx.RespHeader().Set("Access-Control-Expose-Headers", fmt.Sprintf("%s, %s", val, strings.Join(names, ", ")))
} else {
ctx.RespHeader().Set("Access-Control-Expose-Headers", strings.Join(names, ", "))
}
}
// Written returns true if there are something sent to web browser
func (ctx *Context) Written() bool {
return ctx.Resp.Status() > 0
}
// Status writes status code
func (ctx *Context) Status(status int) {
ctx.Resp.WriteHeader(status)
}
// Write writes data to web browser
func (ctx *Context) Write(bs []byte) (int, error) {
return ctx.Resp.Write(bs)
}
// RedirectToUser redirect to a differently-named user
func RedirectToUser(ctx *Context, userName string, redirectUserID int64) {
user, err := user_model.GetUserByID(ctx, redirectUserID)
if err != nil {
ctx.ServerError("GetUserByID", err)
return
}
redirectPath := strings.Replace(
ctx.Req.URL.EscapedPath(),
url.PathEscape(userName),
url.PathEscape(user.Name),
1,
)
if ctx.Req.URL.RawQuery != "" {
redirectPath += "?" + ctx.Req.URL.RawQuery
}
ctx.Redirect(path.Join(setting.AppSubURL, redirectPath), http.StatusTemporaryRedirect)
}
// RedirectToFirst redirects to first not empty URL
func (ctx *Context) RedirectToFirst(location ...string) {
for _, loc := range location {
if len(loc) == 0 {
continue
}
// Unfortunately browsers consider a redirect Location with preceding "//" and "/\" as meaning redirect to "http(s)://REST_OF_PATH"
// Therefore we should ignore these redirect locations to prevent open redirects
if len(loc) > 1 && loc[0] == '/' && (loc[1] == '/' || loc[1] == '\\') {
continue
}
u, err := url.Parse(loc)
if err != nil || ((u.Scheme != "" || u.Host != "") && !strings.HasPrefix(strings.ToLower(loc), strings.ToLower(setting.AppURL))) {
continue
}
ctx.Redirect(loc)
return
}
ctx.Redirect(setting.AppSubURL + "/")
}
const tplStatus500 base.TplName = "status/500"
// HTML calls Context.HTML and renders the template to HTTP response
func (ctx *Context) HTML(status int, name base.TplName) {
log.Debug("Template: %s", name)
tmplStartTime := time.Now()
if !setting.IsProd {
ctx.Data["TemplateName"] = name
}
ctx.Data["TemplateLoadTimes"] = func() string {
return strconv.FormatInt(time.Since(tmplStartTime).Nanoseconds()/1e6, 10) + "ms"
}
err := ctx.Render.HTML(ctx.Resp, status, string(name), ctx.Data)
if err == nil {
return
}
// if rendering fails, show error page
if name != tplStatus500 {
err = fmt.Errorf("failed to render template: %s, error: %s", name, templates.HandleTemplateRenderingError(err))
ctx.ServerError("Render failed", err) // show the 500 error page
} else {
ctx.PlainText(http.StatusInternalServerError, "Unable to render status/500 page, the template system is broken, or Gitea can't find your template files.")
return
}
}
// RenderToString renders the template content to a string
func (ctx *Context) RenderToString(name base.TplName, data map[string]interface{}) (string, error) {
var buf strings.Builder
err := ctx.Render.HTML(&buf, http.StatusOK, string(name), data)
return buf.String(), err
}
// RenderWithErr used for page has form validation but need to prompt error to users.
func (ctx *Context) RenderWithErr(msg string, tpl base.TplName, form interface{}) {
if form != nil {
middleware.AssignForm(form, ctx.Data)
}
ctx.Flash.ErrorMsg = msg
ctx.Data["Flash"] = ctx.Flash
ctx.HTML(http.StatusOK, tpl)
}
// NotFound displays a 404 (Not Found) page and prints the given error, if any.
func (ctx *Context) NotFound(logMsg string, logErr error) {
ctx.notFoundInternal(logMsg, logErr)
}
func (ctx *Context) notFoundInternal(logMsg string, logErr error) {
if logErr != nil {
log.Log(2, log.DEBUG, "%s: %v", logMsg, logErr)
if !setting.IsProd {
ctx.Data["ErrorMsg"] = logErr
}
}
// response simple message if Accept isn't text/html
showHTML := false
for _, part := range ctx.Req.Header["Accept"] {
if strings.Contains(part, "text/html") {
showHTML = true
break
}
}
if !showHTML {
ctx.plainTextInternal(3, http.StatusNotFound, []byte("Not found.\n"))
return
}
ctx.Data["IsRepo"] = ctx.Repo.Repository != nil
ctx.Data["Title"] = "Page Not Found"
ctx.HTML(http.StatusNotFound, base.TplName("status/404"))
}
// ServerError displays a 500 (Internal Server Error) page and prints the given error, if any.
func (ctx *Context) ServerError(logMsg string, logErr error) {
ctx.serverErrorInternal(logMsg, logErr)
}
func (ctx *Context) serverErrorInternal(logMsg string, logErr error) {
if logErr != nil {
log.ErrorWithSkip(2, "%s: %v", logMsg, logErr)
if _, ok := logErr.(*net.OpError); ok || errors.Is(logErr, &net.OpError{}) {
// This is an error within the underlying connection
// and further rendering will not work so just return
return
}
// it's safe to show internal error to admin users, and it helps
if !setting.IsProd || (ctx.Doer != nil && ctx.Doer.IsAdmin) {
ctx.Data["ErrorMsg"] = fmt.Sprintf("%s, %s", logMsg, logErr)
}
}
ctx.Data["Title"] = "Internal Server Error"
ctx.HTML(http.StatusInternalServerError, tplStatus500)
}
// NotFoundOrServerError use error check function to determine if the error
// is about not found. It responds with 404 status code for not found error,
// or error context description for logging purpose of 500 server error.
func (ctx *Context) NotFoundOrServerError(logMsg string, errCheck func(error) bool, logErr error) {
if errCheck(logErr) {
ctx.notFoundInternal(logMsg, logErr)
return
}
ctx.serverErrorInternal(logMsg, logErr)
}
// PlainTextBytes renders bytes as plain text
func (ctx *Context) plainTextInternal(skip, status int, bs []byte) {
statusPrefix := status / 100
if statusPrefix == 4 || statusPrefix == 5 {
log.Log(skip, log.TRACE, "plainTextInternal (status=%d): %s", status, string(bs))
}
ctx.Resp.Header().Set("Content-Type", "text/plain;charset=utf-8")
ctx.Resp.Header().Set("X-Content-Type-Options", "nosniff")
ctx.Resp.WriteHeader(status)
if _, err := ctx.Resp.Write(bs); err != nil {
log.ErrorWithSkip(skip, "plainTextInternal (status=%d): write bytes failed: %v", status, err)
}
}
// PlainTextBytes renders bytes as plain text
func (ctx *Context) PlainTextBytes(status int, bs []byte) {
ctx.plainTextInternal(2, status, bs)
}
// PlainText renders content as plain text
func (ctx *Context) PlainText(status int, text string) {
ctx.plainTextInternal(2, status, []byte(text))
}
// RespHeader returns the response header
func (ctx *Context) RespHeader() http.Header {
return ctx.Resp.Header()
}
// Error returned an error to web browser
func (ctx *Context) Error(status int, contents ...string) {
v := http.StatusText(status)
if len(contents) > 0 {
v = contents[0]
}
http.Error(ctx.Resp, v, status)
}
// JSON render content as JSON
func (ctx *Context) JSON(status int, content interface{}) {
ctx.Resp.Header().Set("Content-Type", "application/json;charset=utf-8")
ctx.Resp.WriteHeader(status)
if err := json.NewEncoder(ctx.Resp).Encode(content); err != nil {
ctx.ServerError("Render JSON failed", err)
}
}
// Redirect redirects the request
func (ctx *Context) Redirect(location string, status ...int) {
code := http.StatusSeeOther
if len(status) == 1 {
code = status[0]
}
if strings.Contains(location, "://") || strings.HasPrefix(location, "//") {
// Some browsers (Safari) have buggy behavior for Cookie + Cache + External Redirection, eg: /my-path => https://other/path
// 1. the first request to "/my-path" contains cookie
// 2. some time later, the request to "/my-path" doesn't contain cookie (caused by Prevent web tracking)
// 3. Gitea's Sessioner doesn't see the session cookie, so it generates a new session id, and returns it to browser
// 4. then the browser accepts the empty session, then the user is logged out
// So in this case, we should remove the session cookie from the response header
removeSessionCookieHeader(ctx.Resp)
}
http.Redirect(ctx.Resp, ctx.Req, location, code)
}