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Use fetch to send requests to create issues/comments (go-gitea#25258)
Follow go-gitea#23290 Network error won't make content lost. And this is a much better approach than "loading-button". The UI is not perfect and there are still some TODOs, they can be done in following PRs, not a must in this PR's scope. <details> ![image](https://github.com/go-gitea/gitea/assets/2114189/c94ba958-aa46-4747-8ddf-6584deeed25c) </details>
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14 files changed

+163
-54
lines changed

14 files changed

+163
-54
lines changed

‎modules/context/base.go‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -136,6 +136,10 @@ func (b *Base) JSONRedirect(redirect string) {
136136
b.JSON(http.StatusOK, map[string]any{"redirect": redirect})
137137
}
138138

139+
func (b *Base) JSONError(msg string) {
140+
b.JSON(http.StatusBadRequest, map[string]any{"errorMessage": msg})
141+
}
142+
139143
// RemoteAddr returns the client machine ip address
140144
func (b *Base) RemoteAddr() string {
141145
return b.Req.RemoteAddr

‎modules/context/context_response.go‎

Lines changed: 2 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -16,6 +16,7 @@ import (
1616

1717
user_model "code.gitea.io/gitea/models/user"
1818
"code.gitea.io/gitea/modules/base"
19+
"code.gitea.io/gitea/modules/httplib"
1920
"code.gitea.io/gitea/modules/log"
2021
"code.gitea.io/gitea/modules/setting"
2122
"code.gitea.io/gitea/modules/templates"
@@ -49,14 +50,7 @@ func (ctx *Context) RedirectToFirst(location ...string) {
4950
continue
5051
}
5152

52-
// Unfortunately browsers consider a redirect Location with preceding "//", "\\" and "/\" as meaning redirect to "http(s)://REST_OF_PATH"
53-
// Therefore we should ignore these redirect locations to prevent open redirects
54-
if len(loc) > 1 && (loc[0] == '/' || loc[0] == '\\') && (loc[1] == '/' || loc[1] == '\\') {
55-
continue
56-
}
57-
58-
u, err := url.Parse(loc)
59-
if err != nil || ((u.Scheme != "" || u.Host != "") && !strings.HasPrefix(strings.ToLower(loc), strings.ToLower(setting.AppURL))) {
53+
if httplib.IsRiskyRedirectURL(loc) {
6054
continue
6155
}
6256

‎modules/httplib/url.go‎

Lines changed: 27 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,27 @@
1+
// Copyright 2023 The Gitea Authors. All rights reserved.
2+
// SPDX-License-Identifier: MIT
3+
4+
package httplib
5+
6+
import (
7+
"net/url"
8+
"strings"
9+
10+
"code.gitea.io/gitea/modules/setting"
11+
)
12+
13+
// IsRiskyRedirectURL returns true if the URL is considered risky for redirects
14+
func IsRiskyRedirectURL(s string) bool {
15+
// Unfortunately browsers consider a redirect Location with preceding "//", "\\", "/\" and "\/" as meaning redirect to "http(s)://REST_OF_PATH"
16+
// Therefore we should ignore these redirect locations to prevent open redirects
17+
if len(s) > 1 && (s[0] == '/' || s[0] == '\\') && (s[1] == '/' || s[1] == '\\') {
18+
return true
19+
}
20+
21+
u, err := url.Parse(s)
22+
if err != nil || ((u.Scheme != "" || u.Host != "") && !strings.HasPrefix(strings.ToLower(s), strings.ToLower(setting.AppURL))) {
23+
return true
24+
}
25+
26+
return false
27+
}

‎modules/httplib/url_test.go‎

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,38 @@
1+
// Copyright 2023 The Gitea Authors. All rights reserved.
2+
// SPDX-License-Identifier: MIT
3+
4+
package httplib
5+
6+
import (
7+
"testing"
8+
9+
"code.gitea.io/gitea/modules/setting"
10+
11+
"github.com/stretchr/testify/assert"
12+
)
13+
14+
func TestIsRiskyRedirectURL(t *testing.T) {
15+
setting.AppURL = "http://localhost:3000/"
16+
tests := []struct {
17+
input string
18+
want bool
19+
}{
20+
{"", false},
21+
{"foo", false},
22+
{"/", false},
23+
{"/foo?k=%20#abc", false},
24+
25+
{"//", true},
26+
{"\\\\", true},
27+
{"/\\", true},
28+
{"\\/", true},
29+
{"mail:[email protected]", true},
30+
{"https://test.com", true},
31+
{setting.AppURL + "/foo", false},
32+
}
33+
for _, tt := range tests {
34+
t.Run(tt.input, func(t *testing.T) {
35+
assert.Equal(t, tt.want, IsRiskyRedirectURL(tt.input))
36+
})
37+
}
38+
}

‎modules/test/utils.go‎

Lines changed: 18 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -5,12 +5,29 @@ package test
55

66
import (
77
"net/http"
8+
"net/http/httptest"
89
"strings"
10+
11+
"code.gitea.io/gitea/modules/json"
912
)
1013

1114
// RedirectURL returns the redirect URL of a http response.
15+
// It also works for JSONRedirect: `{"redirect": "..."}`
1216
func RedirectURL(resp http.ResponseWriter) string {
13-
return resp.Header().Get("Location")
17+
loc := resp.Header().Get("Location")
18+
if loc != "" {
19+
return loc
20+
}
21+
if r, ok := resp.(*httptest.ResponseRecorder); ok {
22+
m := map[string]any{}
23+
err := json.Unmarshal(r.Body.Bytes(), &m)
24+
if err == nil {
25+
if loc, ok := m["redirect"].(string); ok {
26+
return loc
27+
}
28+
}
29+
}
30+
return ""
1431
}
1532

1633
func IsNormalPageCompleted(s string) bool {

‎routers/common/redirect.go‎

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,26 @@
1+
// Copyright 2023 The Gitea Authors. All rights reserved.
2+
// SPDX-License-Identifier: MIT
3+
4+
package common
5+
6+
import (
7+
"net/http"
8+
9+
"code.gitea.io/gitea/modules/httplib"
10+
)
11+
12+
// FetchRedirectDelegate helps the "fetch" requests to redirect to the correct location
13+
func FetchRedirectDelegate(resp http.ResponseWriter, req *http.Request) {
14+
// When use "fetch" to post requests and the response is a redirect, browser's "location.href = uri" has limitations.
15+
// 1. change "location" from old "/foo" to new "/foo#hash", the browser will not reload the page.
16+
// 2. when use "window.reload()", the hash is not respected, the newly loaded page won't scroll to the hash target.
17+
// The typical page is "issue comment" page. The backend responds "/owner/repo/issues/1#comment-2",
18+
// then frontend needs this delegate to redirect to the new location with hash correctly.
19+
redirect := req.PostFormValue("redirect")
20+
if httplib.IsRiskyRedirectURL(redirect) {
21+
resp.WriteHeader(http.StatusBadRequest)
22+
return
23+
}
24+
resp.Header().Add("Location", redirect)
25+
resp.WriteHeader(http.StatusSeeOther)
26+
}

‎routers/init.go‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -183,6 +183,8 @@ func NormalRoutes(ctx context.Context) *web.Route {
183183
r.Mount("/api/v1", apiv1.Routes(ctx))
184184
r.Mount("/api/internal", private.Routes())
185185

186+
r.Post("/-/fetch-redirect", common.FetchRedirectDelegate)
187+
186188
if setting.Packages.Enabled {
187189
// This implements package support for most package managers
188190
r.Mount("/api/packages", packages_router.CommonRoutes(ctx))

‎routers/web/repo/issue.go‎

Lines changed: 12 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1134,12 +1134,12 @@ func NewIssuePost(ctx *context.Context) {
11341134
}
11351135

11361136
if ctx.HasError() {
1137-
ctx.HTML(http.StatusOK, tplIssueNew)
1137+
ctx.JSONError(ctx.GetErrMsg())
11381138
return
11391139
}
11401140

11411141
if util.IsEmptyString(form.Title) {
1142-
ctx.RenderWithErr(ctx.Tr("repo.issues.new.title_empty"), tplIssueNew, form)
1142+
ctx.JSONError(ctx.Tr("repo.issues.new.title_empty"))
11431143
return
11441144
}
11451145

@@ -1184,9 +1184,9 @@ func NewIssuePost(ctx *context.Context) {
11841184

11851185
log.Trace("Issue created: %d/%d", repo.ID, issue.ID)
11861186
if ctx.FormString("redirect_after_creation") == "project" && projectID > 0 {
1187-
ctx.Redirect(ctx.Repo.RepoLink + "/projects/" + strconv.FormatInt(projectID, 10))
1187+
ctx.JSONRedirect(ctx.Repo.RepoLink + "/projects/" + strconv.FormatInt(projectID, 10))
11881188
} else {
1189-
ctx.Redirect(issue.Link())
1189+
ctx.JSONRedirect(issue.Link())
11901190
}
11911191
}
11921192

@@ -2777,8 +2777,7 @@ func NewComment(ctx *context.Context) {
27772777
}
27782778

27792779
if issue.IsLocked && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) && !ctx.Doer.IsAdmin {
2780-
ctx.Flash.Error(ctx.Tr("repo.issues.comment_on_locked"))
2781-
ctx.Redirect(issue.Link())
2780+
ctx.JSONError(ctx.Tr("repo.issues.comment_on_locked"))
27822781
return
27832782
}
27842783

@@ -2788,8 +2787,7 @@ func NewComment(ctx *context.Context) {
27882787
}
27892788

27902789
if ctx.HasError() {
2791-
ctx.Flash.Error(ctx.Data["ErrorMsg"].(string))
2792-
ctx.Redirect(issue.Link())
2790+
ctx.JSONError(ctx.GetErrMsg())
27932791
return
27942792
}
27952793

@@ -2809,8 +2807,7 @@ func NewComment(ctx *context.Context) {
28092807
pr, err = issues_model.GetUnmergedPullRequest(ctx, pull.HeadRepoID, pull.BaseRepoID, pull.HeadBranch, pull.BaseBranch, pull.Flow)
28102808
if err != nil {
28112809
if !issues_model.IsErrPullRequestNotExist(err) {
2812-
ctx.Flash.Error(ctx.Tr("repo.issues.dependency.pr_close_blocked"))
2813-
ctx.Redirect(fmt.Sprintf("%s/pulls/%d", ctx.Repo.RepoLink, pull.Index))
2810+
ctx.JSONError(ctx.Tr("repo.issues.dependency.pr_close_blocked"))
28142811
return
28152812
}
28162813
}
@@ -2841,8 +2838,7 @@ func NewComment(ctx *context.Context) {
28412838
}
28422839
if ok := git.IsBranchExist(ctx, pull.HeadRepo.RepoPath(), pull.BaseBranch); !ok {
28432840
// todo localize
2844-
ctx.Flash.Error("The origin branch is delete, cannot reopen.")
2845-
ctx.Redirect(fmt.Sprintf("%s/pulls/%d", ctx.Repo.RepoLink, pull.Index))
2841+
ctx.JSONError("The origin branch is delete, cannot reopen.")
28462842
return
28472843
}
28482844
headBranchRef := pull.GetGitHeadBranchRefName()
@@ -2882,11 +2878,9 @@ func NewComment(ctx *context.Context) {
28822878

28832879
if issues_model.IsErrDependenciesLeft(err) {
28842880
if issue.IsPull {
2885-
ctx.Flash.Error(ctx.Tr("repo.issues.dependency.pr_close_blocked"))
2886-
ctx.Redirect(fmt.Sprintf("%s/pulls/%d", ctx.Repo.RepoLink, issue.Index))
2881+
ctx.JSONError(ctx.Tr("repo.issues.dependency.pr_close_blocked"))
28872882
} else {
2888-
ctx.Flash.Error(ctx.Tr("repo.issues.dependency.issue_close_blocked"))
2889-
ctx.Redirect(fmt.Sprintf("%s/issues/%d", ctx.Repo.RepoLink, issue.Index))
2883+
ctx.JSONError(ctx.Tr("repo.issues.dependency.issue_close_blocked"))
28902884
}
28912885
return
28922886
}
@@ -2899,7 +2893,6 @@ func NewComment(ctx *context.Context) {
28992893
log.Trace("Issue [%d] status changed to closed: %v", issue.ID, issue.IsClosed)
29002894
}
29012895
}
2902-
29032896
}
29042897

29052898
// Redirect to comment hashtag if there is any actual content.
@@ -2908,9 +2901,9 @@ func NewComment(ctx *context.Context) {
29082901
typeName = "pulls"
29092902
}
29102903
if comment != nil {
2911-
ctx.Redirect(fmt.Sprintf("%s/%s/%d#%s", ctx.Repo.RepoLink, typeName, issue.Index, comment.HashTag()))
2904+
ctx.JSONRedirect(fmt.Sprintf("%s/%s/%d#%s", ctx.Repo.RepoLink, typeName, issue.Index, comment.HashTag()))
29122905
} else {
2913-
ctx.Redirect(fmt.Sprintf("%s/%s/%d", ctx.Repo.RepoLink, typeName, issue.Index))
2906+
ctx.JSONRedirect(fmt.Sprintf("%s/%s/%d", ctx.Repo.RepoLink, typeName, issue.Index))
29142907
}
29152908
}()
29162909

‎templates/repo/issue/new_form.tmpl‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<form class="issue-content ui comment form" id="new-issue" action="{{.Link}}" method="post">
1+
<form class="issue-content ui comment form form-fetch-action" id="new-issue" action="{{.Link}}" method="post">
22
{{.CsrfTokenHtml}}
33
{{if .Flash}}
44
<div class="sixteen wide column">
@@ -35,7 +35,7 @@
3535
{{template "repo/issue/comment_tab" .}}
3636
{{end}}
3737
<div class="text right">
38-
<button class="ui green button loading-button" tabindex="6">
38+
<button class="ui green button" tabindex="6">
3939
{{if .PageIsComparePull}}
4040
{{.locale.Tr "repo.pulls.create"}}
4141
{{else}}

‎templates/repo/issue/view_content.tmpl‎

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -96,28 +96,27 @@
9696
{{avatar $.Context .SignedUser 40}}
9797
</a>
9898
<div class="content">
99-
<form class="ui segment form" id="comment-form" action="{{$.RepoLink}}/issues/{{.Issue.Index}}/comments" method="post">
99+
<form class="ui segment form form-fetch-action" id="comment-form" action="{{$.RepoLink}}/issues/{{.Issue.Index}}/comments" method="post">
100100
{{template "repo/issue/comment_tab" .}}
101101
{{.CsrfTokenHtml}}
102-
<input id="status" name="status" type="hidden">
103102
<div class="field footer">
104103
<div class="text right">
105104
{{if and (or .HasIssuesOrPullsWritePermission .IsIssuePoster) (not .DisableStatusChange)}}
106105
{{if .Issue.IsClosed}}
107-
<button id="status-button" class="ui green basic button" tabindex="6" data-status="{{.locale.Tr "repo.issues.reopen_issue"}}" data-status-and-comment="{{.locale.Tr "repo.issues.reopen_comment_issue"}}" data-status-val="reopen">
106+
<button id="status-button" class="ui green basic button" tabindex="6" data-status="{{.locale.Tr "repo.issues.reopen_issue"}}" data-status-and-comment="{{.locale.Tr "repo.issues.reopen_comment_issue"}}" name="status" value="reopen">
108107
{{.locale.Tr "repo.issues.reopen_issue"}}
109108
</button>
110109
{{else}}
111110
{{$closeTranslationKey := "repo.issues.close"}}
112111
{{if .Issue.IsPull}}
113112
{{$closeTranslationKey = "repo.pulls.close"}}
114113
{{end}}
115-
<button id="status-button" class="ui red basic button" tabindex="6" data-status="{{.locale.Tr $closeTranslationKey}}" data-status-and-comment="{{.locale.Tr "repo.issues.close_comment_issue"}}" data-status-val="close">
114+
<button id="status-button" class="ui red basic button" tabindex="6" data-status="{{.locale.Tr $closeTranslationKey}}" data-status-and-comment="{{.locale.Tr "repo.issues.close_comment_issue"}}" name="status" value="close">
116115
{{.locale.Tr $closeTranslationKey}}
117116
</button>
118117
{{end}}
119118
{{end}}
120-
<button class="ui green button loading-button" tabindex="5">
119+
<button class="ui green button" tabindex="5">
121120
{{.locale.Tr "repo.issues.create_comment"}}
122121
</button>
123122
</div>

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