forgejo/modules/context/base.go
wxiaoguang 6b33152b7d
Decouple the different contexts from each other (#24786)
Replace #16455

Close #21803

Mixing different Gitea contexts together causes some problems:

1. Unable to respond proper content when error occurs, eg: Web should
respond HTML while API should respond JSON
2. Unclear dependency, eg: it's unclear when Context is used in
APIContext, which fields should be initialized, which methods are
necessary.


To make things clear, this PR introduces a Base context, it only
provides basic Req/Resp/Data features.

This PR mainly moves code. There are still many legacy problems and
TODOs in code, leave unrelated changes to future PRs.
2023-05-21 09:50:53 +08:00

300 lines
8.7 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"context"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"code.gitea.io/gitea/modules/httplib"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/translation"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/web/middleware"
"github.com/go-chi/chi/v5"
)
type contextValuePair struct {
key any
valueFn func() any
}
type Base struct {
originCtx context.Context
contextValues []contextValuePair
Resp ResponseWriter
Req *http.Request
// Data is prepared by ContextDataStore middleware, this field only refers to the pre-created/prepared ContextData.
// Although it's mainly used for MVC templates, sometimes it's also used to pass data between middlewares/handler
Data middleware.ContextData
// Locale is mainly for Web context, although the API context also uses it in some cases: message response, form validation
Locale translation.Locale
}
func (b *Base) Deadline() (deadline time.Time, ok bool) {
return b.originCtx.Deadline()
}
func (b *Base) Done() <-chan struct{} {
return b.originCtx.Done()
}
func (b *Base) Err() error {
return b.originCtx.Err()
}
func (b *Base) Value(key any) any {
for _, pair := range b.contextValues {
if pair.key == key {
return pair.valueFn()
}
}
return b.originCtx.Value(key)
}
func (b *Base) AppendContextValueFunc(key any, valueFn func() any) any {
b.contextValues = append(b.contextValues, contextValuePair{key, valueFn})
return b
}
func (b *Base) AppendContextValue(key, value any) any {
b.contextValues = append(b.contextValues, contextValuePair{key, func() any { return value }})
return b
}
func (b *Base) GetData() middleware.ContextData {
return b.Data
}
// AppendAccessControlExposeHeaders append headers by name to "Access-Control-Expose-Headers" header
func (b *Base) AppendAccessControlExposeHeaders(names ...string) {
val := b.RespHeader().Get("Access-Control-Expose-Headers")
if len(val) != 0 {
b.RespHeader().Set("Access-Control-Expose-Headers", fmt.Sprintf("%s, %s", val, strings.Join(names, ", ")))
} else {
b.RespHeader().Set("Access-Control-Expose-Headers", strings.Join(names, ", "))
}
}
// SetTotalCountHeader set "X-Total-Count" header
func (b *Base) SetTotalCountHeader(total int64) {
b.RespHeader().Set("X-Total-Count", fmt.Sprint(total))
b.AppendAccessControlExposeHeaders("X-Total-Count")
}
// Written returns true if there are something sent to web browser
func (b *Base) Written() bool {
return b.Resp.Status() > 0
}
// Status writes status code
func (b *Base) Status(status int) {
b.Resp.WriteHeader(status)
}
// Write writes data to web browser
func (b *Base) Write(bs []byte) (int, error) {
return b.Resp.Write(bs)
}
// RespHeader returns the response header
func (b *Base) RespHeader() http.Header {
return b.Resp.Header()
}
// Error returned an error to web browser
func (b *Base) Error(status int, contents ...string) {
v := http.StatusText(status)
if len(contents) > 0 {
v = contents[0]
}
http.Error(b.Resp, v, status)
}
// JSON render content as JSON
func (b *Base) JSON(status int, content interface{}) {
b.Resp.Header().Set("Content-Type", "application/json;charset=utf-8")
b.Resp.WriteHeader(status)
if err := json.NewEncoder(b.Resp).Encode(content); err != nil {
log.Error("Render JSON failed: %v", err)
}
}
// RemoteAddr returns the client machine ip address
func (b *Base) RemoteAddr() string {
return b.Req.RemoteAddr
}
// Params returns the param on route
func (b *Base) Params(p string) string {
s, _ := url.PathUnescape(chi.URLParam(b.Req, strings.TrimPrefix(p, ":")))
return s
}
// ParamsInt64 returns the param on route as int64
func (b *Base) ParamsInt64(p string) int64 {
v, _ := strconv.ParseInt(b.Params(p), 10, 64)
return v
}
// SetParams set params into routes
func (b *Base) SetParams(k, v string) {
chiCtx := chi.RouteContext(b)
chiCtx.URLParams.Add(strings.TrimPrefix(k, ":"), url.PathEscape(v))
}
// FormString returns the first value matching the provided key in the form as a string
func (b *Base) FormString(key string) string {
return b.Req.FormValue(key)
}
// FormStrings returns a string slice for the provided key from the form
func (b *Base) FormStrings(key string) []string {
if b.Req.Form == nil {
if err := b.Req.ParseMultipartForm(32 << 20); err != nil {
return nil
}
}
if v, ok := b.Req.Form[key]; ok {
return v
}
return nil
}
// FormTrim returns the first value for the provided key in the form as a space trimmed string
func (b *Base) FormTrim(key string) string {
return strings.TrimSpace(b.Req.FormValue(key))
}
// FormInt returns the first value for the provided key in the form as an int
func (b *Base) FormInt(key string) int {
v, _ := strconv.Atoi(b.Req.FormValue(key))
return v
}
// FormInt64 returns the first value for the provided key in the form as an int64
func (b *Base) FormInt64(key string) int64 {
v, _ := strconv.ParseInt(b.Req.FormValue(key), 10, 64)
return v
}
// FormBool returns true if the value for the provided key in the form is "1", "true" or "on"
func (b *Base) FormBool(key string) bool {
s := b.Req.FormValue(key)
v, _ := strconv.ParseBool(s)
v = v || strings.EqualFold(s, "on")
return v
}
// FormOptionalBool returns an OptionalBoolTrue or OptionalBoolFalse if the value
// for the provided key exists in the form else it returns OptionalBoolNone
func (b *Base) FormOptionalBool(key string) util.OptionalBool {
value := b.Req.FormValue(key)
if len(value) == 0 {
return util.OptionalBoolNone
}
s := b.Req.FormValue(key)
v, _ := strconv.ParseBool(s)
v = v || strings.EqualFold(s, "on")
return util.OptionalBoolOf(v)
}
func (b *Base) SetFormString(key, value string) {
_ = b.Req.FormValue(key) // force parse form
b.Req.Form.Set(key, value)
}
// PlainTextBytes renders bytes as plain text
func (b *Base) 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))
}
b.Resp.Header().Set("Content-Type", "text/plain;charset=utf-8")
b.Resp.Header().Set("X-Content-Type-Options", "nosniff")
b.Resp.WriteHeader(status)
if _, err := b.Resp.Write(bs); err != nil {
log.ErrorWithSkip(skip, "plainTextInternal (status=%d): write bytes failed: %v", status, err)
}
}
// PlainTextBytes renders bytes as plain text
func (b *Base) PlainTextBytes(status int, bs []byte) {
b.plainTextInternal(2, status, bs)
}
// PlainText renders content as plain text
func (b *Base) PlainText(status int, text string) {
b.plainTextInternal(2, status, []byte(text))
}
// Redirect redirects the request
func (b *Base) 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(b.Resp)
}
http.Redirect(b.Resp, b.Req, location, code)
}
type ServeHeaderOptions httplib.ServeHeaderOptions
func (b *Base) SetServeHeaders(opt *ServeHeaderOptions) {
httplib.ServeSetHeaders(b.Resp, (*httplib.ServeHeaderOptions)(opt))
}
// ServeContent serves content to http request
func (b *Base) ServeContent(r io.ReadSeeker, opts *ServeHeaderOptions) {
httplib.ServeSetHeaders(b.Resp, (*httplib.ServeHeaderOptions)(opts))
http.ServeContent(b.Resp, b.Req, opts.Filename, opts.LastModified, r)
}
// Close frees all resources hold by Context
func (b *Base) cleanUp() {
if b.Req != nil && b.Req.MultipartForm != nil {
_ = b.Req.MultipartForm.RemoveAll() // remove the temp files buffered to tmp directory
}
}
func (b *Base) Tr(msg string, args ...any) string {
return b.Locale.Tr(msg, args...)
}
func (b *Base) TrN(cnt any, key1, keyN string, args ...any) string {
return b.Locale.TrN(cnt, key1, keyN, args...)
}
func NewBaseContext(resp http.ResponseWriter, req *http.Request) (b *Base, closeFunc func()) {
b = &Base{
originCtx: req.Context(),
Req: req,
Resp: WrapResponseWriter(resp),
Locale: middleware.Locale(resp, req),
Data: middleware.GetContextData(req.Context()),
}
b.AppendContextValue(translation.ContextKey, b.Locale)
b.Req = b.Req.WithContext(b)
return b, b.cleanUp
}