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gitea/services/gitdiff/gitdiff_test.go
zeripath 45ca2e4605 Handle incomplete diff files properly (#13662) 
* Handle incomplete diff files properly

The code for parsing diff hunks has a bug whereby a very long line
in a very long diff would not be completely read leading to an unexpected
character.

This PR ensures that the line is completely cleared

Fix #13602

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Also allow git max line length <4096

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add test case

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-11-21 17:41:24 -05:00

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// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package gitdiff
import (
"encoding/json"
"fmt"
"html/template"
"strconv"
"strings"
"testing"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/setting"
dmp "github.com/sergi/go-diff/diffmatchpatch"
"github.com/stretchr/testify/assert"
"gopkg.in/ini.v1"
)
func assertEqual(t *testing.T, s1 string, s2 template.HTML) {
if s1 != string(s2) {
t.Errorf("%s should be equal %s", s2, s1)
}
}
func TestDiffToHTML(t *testing.T) {
setting.Cfg = ini.Empty()
assertEqual(t, "foo <span class=\"added-code\">bar</span> biz", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "foo "},
{Type: dmp.DiffInsert, Text: "bar"},
{Type: dmp.DiffDelete, Text: " baz"},
{Type: dmp.DiffEqual, Text: " biz"},
}, DiffLineAdd))
assertEqual(t, "foo <span class=\"removed-code\">bar</span> biz", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "foo "},
{Type: dmp.DiffDelete, Text: "bar"},
{Type: dmp.DiffInsert, Text: " baz"},
{Type: dmp.DiffEqual, Text: " biz"},
}, DiffLineDel))
assertEqual(t, "<span class=\"k\">if</span> <span class=\"p\">!</span><span class=\"nx\">nohl</span> <span class=\"o\">&amp;&amp;</span> <span class=\"added-code\"><span class=\"p\">(</span></span><span class=\"nx\">lexer</span> <span class=\"o\">!=</span> <span class=\"kc\">nil</span><span class=\"added-code\"> <span class=\"o\">||</span> <span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nx\">GuessLanguage</span><span class=\"p\">)</span></span> <span class=\"p\">{</span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "<span class=\"k\">if</span> <span class=\"p\">!</span><span class=\"nx\">nohl</span> <span class=\"o\">&amp;&amp;</span> <span class=\""},
{Type: dmp.DiffInsert, Text: "p\">(</span><span class=\""},
{Type: dmp.DiffEqual, Text: "nx\">lexer</span> <span class=\"o\">!=</span> <span class=\"kc\">nil"},
{Type: dmp.DiffInsert, Text: "</span> <span class=\"o\">||</span> <span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nx\">GuessLanguage</span><span class=\"p\">)"},
{Type: dmp.DiffEqual, Text: "</span> <span class=\"p\">{</span>"},
}, DiffLineAdd))
assertEqual(t, "<span class=\"nx\">tagURL</span> <span class=\"o\">:=</span> <span class=\"removed-code\"><span class=\"nx\">fmt</span><span class=\"p\">.</span><span class=\"nf\">Sprintf</span><span class=\"p\">(</span><span class=\"s\">&#34;## [%s](%s/%s/%s/%s?q=&amp;type=all&amp;state=closed&amp;milestone=%d) - %s&#34;</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone\"</span></span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">BaseURL</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Owner</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Repo</span><span class=\"p\">,</span> <span class=\"removed-code\"><span class=\"nx\">from</span><span class=\"p\">,</span> <span class=\"nx\">milestoneID</span><span class=\"p\">,</span> <span class=\"nx\">time</span><span class=\"p\">.</span><span class=\"nf\">Now</span><span class=\"p\">(</span><span class=\"p\">)</span><span class=\"p\">.</span><span class=\"nf\">Format</span><span class=\"p\">(</span><span class=\"s\">&#34;2006-01-02&#34;</span><span class=\"p\">)</span></span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "<span class=\"nx\">tagURL</span> <span class=\"o\">:=</span> <span class=\"n"},
{Type: dmp.DiffDelete, Text: "x\">fmt</span><span class=\"p\">.</span><span class=\"nf\">Sprintf</span><span class=\"p\">(</span><span class=\"s\">&#34;## [%s](%s/%s/%s/%s?q=&amp;type=all&amp;state=closed&amp;milestone=%d) - %s&#34;</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone\""},
{Type: dmp.DiffInsert, Text: "f\">getGiteaTagURL</span><span class=\"p\">(</span><span class=\"nx\">client"},
{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">BaseURL</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Owner</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Repo</span><span class=\"p\">,</span> <span class=\"nx\">"},
{Type: dmp.DiffDelete, Text: "from</span><span class=\"p\">,</span> <span class=\"nx\">milestoneID</span><span class=\"p\">,</span> <span class=\"nx\">time</span><span class=\"p\">.</span><span class=\"nf\">Now</span><span class=\"p\">(</span><span class=\"p\">)</span><span class=\"p\">.</span><span class=\"nf\">Format</span><span class=\"p\">(</span><span class=\"s\">&#34;2006-01-02&#34;</span><span class=\"p\">)"},
{Type: dmp.DiffInsert, Text: "ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone</span><span class=\"p\">,</span> <span class=\"nx\">from</span><span class=\"p\">,</span> <span class=\"nx\">milestoneID"},
{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">)</span>"},
}, DiffLineDel))
assertEqual(t, "<span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nf\">WrapperRenderer</span><span class=\"p\">(</span><span class=\"nx\">w</span><span class=\"p\">,</span> <span class=\"removed-code\"><span class=\"nx\">language</span></span><span class=\"removed-code\"><span class=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs</span></span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "<span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nf\">WrapperRenderer</span><span class=\"p\">(</span><span class=\"nx\">w</span><span class=\"p\">,</span> <span class=\"nx\">"},
{Type: dmp.DiffDelete, Text: "language</span><span "},
{Type: dmp.DiffEqual, Text: "c"},
{Type: dmp.DiffDelete, Text: "lass=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs"},
{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>"},
}, DiffLineDel))
assertEqual(t, "<span class=\"added-code\">language</span></span><span class=\"added-code\"><span class=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs</span></span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffInsert, Text: "language</span><span "},
{Type: dmp.DiffEqual, Text: "c"},
{Type: dmp.DiffInsert, Text: "lass=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs"},
{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>"},
}, DiffLineAdd))
assertEqual(t, "<span class=\"k\">print</span><span class=\"added-code\"></span><span class=\"added-code\"><span class=\"p\">(</span></span><span class=\"sa\"></span><span class=\"s2\">&#34;</span><span class=\"s2\">// </span><span class=\"s2\">&#34;</span><span class=\"p\">,</span> <span class=\"n\">sys</span><span class=\"o\">.</span><span class=\"n\">argv</span><span class=\"added-code\"><span class=\"p\">)</span></span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "<span class=\"k\">print</span>"},
{Type: dmp.DiffInsert, Text: "<span"},
{Type: dmp.DiffEqual, Text: " "},
{Type: dmp.DiffInsert, Text: "class=\"p\">(</span>"},
{Type: dmp.DiffEqual, Text: "<span class=\"sa\"></span><span class=\"s2\">&#34;</span><span class=\"s2\">// </span><span class=\"s2\">&#34;</span><span class=\"p\">,</span> <span class=\"n\">sys</span><span class=\"o\">.</span><span class=\"n\">argv</span>"},
{Type: dmp.DiffInsert, Text: "<span class=\"p\">)</span>"},
}, DiffLineAdd))
assertEqual(t, "sh <span class=\"added-code\">&#39;useradd -u $(stat -c &#34;%u&#34; .gitignore) jenkins</span>&#39;", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "sh &#3"},
{Type: dmp.DiffDelete, Text: "4;useradd -u 111 jenkins&#34"},
{Type: dmp.DiffInsert, Text: "9;useradd -u $(stat -c &#34;%u&#34; .gitignore) jenkins&#39"},
{Type: dmp.DiffEqual, Text: ";"},
}, DiffLineAdd))
assertEqual(t, "<span class=\"x\"> &lt;h<span class=\"added-code\">4 class=</span><span class=\"added-code\">&#34;release-list-title df ac&#34;</span>&gt;</span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "<span class=\"x\"> &lt;h"},
{Type: dmp.DiffInsert, Text: "4 class=&#"},
{Type: dmp.DiffEqual, Text: "3"},
{Type: dmp.DiffInsert, Text: "4;release-list-title df ac&#34;"},
{Type: dmp.DiffEqual, Text: "&gt;</span>"},
}, DiffLineAdd))
}
func TestParsePatch_singlefile(t *testing.T) {
type testcase struct {
name string
gitdiff string
wantErr bool
addition int
deletion int
oldFilename string
filename string
}
tests := []testcase{
{
name: "readme.md2readme.md",
gitdiff: `diff --git "\\a/README.md" "\\b/README.md"
--- "\\a/README.md"
+++ "\\b/README.md"
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off
`,
addition: 4,
deletion: 1,
filename: "README.md",
oldFilename: "README.md",
},
{
name: "A \\ B",
gitdiff: `diff --git "a/A \\ B" "b/A \\ B"
--- "a/A \\ B"
+++ "b/A \\ B"
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off`,
addition: 4,
deletion: 1,
filename: "A \\ B",
oldFilename: "A \\ B",
},
{
name: "really weird filename",
gitdiff: `diff --git "\\a/a b/file b/a a/file" "\\b/a b/file b/a a/file"
index d2186f1..f5c8ed2 100644
--- "\\a/a b/file b/a a/file" ` + `
+++ "\\b/a b/file b/a a/file" ` + `
@@ -1,3 +1,2 @@
Create a weird file.
` + `
-and what does diff do here?
\ No newline at end of file`,
addition: 0,
deletion: 1,
filename: "a b/file b/a a/file",
oldFilename: "a b/file b/a a/file",
},
{
name: "delete file with blanks",
gitdiff: `diff --git "\\a/file with blanks" "\\b/file with blanks"
deleted file mode 100644
index 898651a..0000000
--- "\\a/file with blanks" ` + `
+++ /dev/null
@@ -1,5 +0,0 @@
-a blank file
-
-has a couple o line
-
-the 5th line is the last
`,
addition: 0,
deletion: 5,
filename: "file with blanks",
oldFilename: "file with blanks",
},
{
name: "rename a—as",
gitdiff: `diff --git "a/\360\243\220\265b\342\200\240vs" "b/a\342\200\224as"
similarity index 100%
rename from "\360\243\220\265b\342\200\240vs"
rename to "a\342\200\224as"
`,
addition: 0,
deletion: 0,
oldFilename: "𣐵b†vs",
filename: "a—as",
},
{
name: "rename with spaces",
gitdiff: `diff --git "\\a/a b/file b/a a/file" "\\b/a b/a a/file b/b file"
similarity index 100%
rename from a b/file b/a a/file
rename to a b/a a/file b/b file
`,
oldFilename: "a b/file b/a a/file",
filename: "a b/a a/file b/b file",
},
{
name: "minuses-and-pluses",
gitdiff: `diff --git a/minuses-and-pluses b/minuses-and-pluses
index 6961180..9ba1a00 100644
--- a/minuses-and-pluses
+++ b/minuses-and-pluses
@@ -1,4 +1,4 @@
--- 1st line
-++ 2nd line
--- 3rd line
-++ 4th line
+++ 1st line
+-- 2nd line
+++ 3rd line
+-- 4th line
`,
oldFilename: "minuses-and-pluses",
filename: "minuses-and-pluses",
addition: 4,
deletion: 4,
},
}
for _, testcase := range tests {
t.Run(testcase.name, func(t *testing.T) {
got, err := ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(testcase.gitdiff))
if (err != nil) != testcase.wantErr {
t.Errorf("ParsePatch() error = %v, wantErr %v", err, testcase.wantErr)
return
}
gotMarshaled, _ := json.MarshalIndent(got, " ", " ")
if got.NumFiles != 1 {
t.Errorf("ParsePath() did not receive 1 file:\n%s", string(gotMarshaled))
return
}
if got.TotalAddition != testcase.addition {
t.Errorf("ParsePath() does not have correct totalAddition %d, wanted %d", got.TotalAddition, testcase.addition)
}
if got.TotalDeletion != testcase.deletion {
t.Errorf("ParsePath() did not have correct totalDeletion %d, wanted %d", got.TotalDeletion, testcase.deletion)
}
file := got.Files[0]
if file.Addition != testcase.addition {
t.Errorf("ParsePath() does not have correct file addition %d, wanted %d", file.Addition, testcase.addition)
}
if file.Deletion != testcase.deletion {
t.Errorf("ParsePath() did not have correct file deletion %d, wanted %d", file.Deletion, testcase.deletion)
}
if file.OldName != testcase.oldFilename {
t.Errorf("ParsePath() did not have correct OldName %s, wanted %s", file.OldName, testcase.oldFilename)
}
if file.Name != testcase.filename {
t.Errorf("ParsePath() did not have correct Name %s, wanted %s", file.Name, testcase.filename)
}
})
}
// Test max lines
diffBuilder := &strings.Builder{}
var diff = `diff --git a/newfile2 b/newfile2
new file mode 100644
index 0000000..6bb8f39
--- /dev/null
+++ b/newfile2
@@ -0,0 +1,35 @@
`
diffBuilder.WriteString(diff)
for i := 0; i < 35; i++ {
diffBuilder.WriteString("+line" + strconv.Itoa(i) + "\n")
}
diff = diffBuilder.String()
result, err := ParsePatch(20, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(diff))
if err != nil {
t.Errorf("There should not be an error: %v", err)
}
if !result.Files[0].IsIncomplete {
t.Errorf("Files should be incomplete! %v", result.Files[0])
}
result, err = ParsePatch(40, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(diff))
if err != nil {
t.Errorf("There should not be an error: %v", err)
}
if result.Files[0].IsIncomplete {
t.Errorf("Files should not be incomplete! %v", result.Files[0])
}
result, err = ParsePatch(40, 5, setting.Git.MaxGitDiffFiles, strings.NewReader(diff))
if err != nil {
t.Errorf("There should not be an error: %v", err)
}
if !result.Files[0].IsIncomplete {
t.Errorf("Files should be incomplete! %v", result.Files[0])
}
// Test max characters
diff = `diff --git a/newfile2 b/newfile2
new file mode 100644
index 0000000..6bb8f39
--- /dev/null
+++ b/newfile2
@@ -0,0 +1,35 @@
`
diffBuilder.Reset()
diffBuilder.WriteString(diff)
for i := 0; i < 33; i++ {
diffBuilder.WriteString("+line" + strconv.Itoa(i) + "\n")
}
diffBuilder.WriteString("+line33")
for i := 0; i < 512; i++ {
diffBuilder.WriteString("0123456789ABCDEF")
}
diffBuilder.WriteByte('\n')
diffBuilder.WriteString("+line" + strconv.Itoa(34) + "\n")
diffBuilder.WriteString("+line" + strconv.Itoa(35) + "\n")
diff = diffBuilder.String()
result, err = ParsePatch(20, 4096, setting.Git.MaxGitDiffFiles, strings.NewReader(diff))
if err != nil {
t.Errorf("There should not be an error: %v", err)
}
if !result.Files[0].IsIncomplete {
t.Errorf("Files should be incomplete! %v", result.Files[0])
}
result, err = ParsePatch(40, 4096, setting.Git.MaxGitDiffFiles, strings.NewReader(diff))
if err != nil {
t.Errorf("There should not be an error: %v", err)
}
if !result.Files[0].IsIncomplete {
t.Errorf("Files should be incomplete! %v", result.Files[0])
}
diff = `diff --git "a/README.md" "b/README.md"
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off`
result, err = ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(diff))
if err != nil {
t.Errorf("ParsePatch failed: %s", err)
}
println(result)
var diff2 = `diff --git "a/A \\ B" "b/A \\ B"
--- "a/A \\ B"
+++ "b/A \\ B"
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off`
result, err = ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(diff2))
if err != nil {
t.Errorf("ParsePatch failed: %s", err)
}
println(result)
var diff2a = `diff --git "a/A \\ B" b/A/B
--- "a/A \\ B"
+++ b/A/B
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off`
result, err = ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(diff2a))
if err != nil {
t.Errorf("ParsePatch failed: %s", err)
}
println(result)
var diff3 = `diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
# gitea-github-migrator
+
+ Build Status
- Latest Release
Docker Pulls
+ cut off
+ cut off`
result, err = ParsePatch(setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, strings.NewReader(diff3))
if err != nil {
t.Errorf("ParsePatch failed: %s", err)
}
println(result)
}
func setupDefaultDiff() *Diff {
return &Diff{
Files: []*DiffFile{
{
Name: "README.md",
Sections: []*DiffSection{
{
Lines: []*DiffLine{
{
LeftIdx: 4,
RightIdx: 4,
},
},
},
},
},
},
}
}
func TestDiff_LoadComments(t *testing.T) {
assert.NoError(t, models.PrepareTestDatabase())
issue := models.AssertExistsAndLoadBean(t, &models.Issue{ID: 2}).(*models.Issue)
user := models.AssertExistsAndLoadBean(t, &models.User{ID: 1}).(*models.User)
diff := setupDefaultDiff()
assert.NoError(t, diff.LoadComments(issue, user))
assert.Len(t, diff.Files[0].Sections[0].Lines[0].Comments, 2)
}
func TestDiffLine_CanComment(t *testing.T) {
assert.False(t, (&DiffLine{Type: DiffLineSection}).CanComment())
assert.False(t, (&DiffLine{Type: DiffLineAdd, Comments: []*models.Comment{{Content: "bla"}}}).CanComment())
assert.True(t, (&DiffLine{Type: DiffLineAdd}).CanComment())
assert.True(t, (&DiffLine{Type: DiffLineDel}).CanComment())
assert.True(t, (&DiffLine{Type: DiffLinePlain}).CanComment())
}
func TestDiffLine_GetCommentSide(t *testing.T) {
assert.Equal(t, "previous", (&DiffLine{Comments: []*models.Comment{{Line: -3}}}).GetCommentSide())
assert.Equal(t, "proposed", (&DiffLine{Comments: []*models.Comment{{Line: 3}}}).GetCommentSide())
}
func TestGetDiffRangeWithWhitespaceBehavior(t *testing.T) {
git.Debug = true
for _, behavior := range []string{"-w", "--ignore-space-at-eol", "-b", ""} {
diffs, err := GetDiffRangeWithWhitespaceBehavior("./testdata/academic-module", "559c156f8e0178b71cb44355428f24001b08fc68", "bd7063cc7c04689c4d082183d32a604ed27a24f9",
setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffFiles, behavior)
assert.NoError(t, err, fmt.Sprintf("Error when diff with %s", behavior))
for _, f := range diffs.Files {
assert.True(t, len(f.Sections) > 0, fmt.Sprintf("%s should have sections", f.Name))
}
}
}
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