Support unicode emojis and remove emojify.js (#11032)

* Support unicode emojis and remove emojify.js

This PR replaces all use of emojify.js and adds unicode emoji support to various areas of gitea.

This works in a few ways:

First it adds emoji parsing support into gitea itself. This allows us to

 * Render emojis from valid alias (😄)
 * Detect unicode emojis and let us put them in their own class with proper aria-labels and styling
 * Easily allow for custom "emoji"
 * Support all emoji rendering and features without javascript
 * Uses plain unicode and lets the system render in appropriate emoji font
 * Doesn't leave us relying on external sources for updates/fixes/features

That same list of emoji is also used to create a json file which replaces the part of emojify.js that populates the emoji search tribute. This file is about 35KB with GZIP turned on and I've set it to load after the page renders to not hinder page load time (and this removes loading emojify.js also)

For custom "emoji" it uses a pretty simple scheme of just looking for /emojis/img/name.png where name is something a user has put in the "allowed reactions" setting we already have. The gitea reaction that was previously hard coded into a forked copy of emojify.js is included and works as a custom reaction under this method.

The emoji data sourced here is from https://github.com/github/gemoji which is the gem library Github uses for their emoji rendering (and a data source for other sites). So we should be able to easily render any emoji and :alias: that Github can, removing any errors from migrated content. They also update it as well, so we can sync when there are new unicode emoji lists released.

I've included a slimmed down and slightly modified forked copy of https://github.com/knq/emoji to make up our own emoji module. The code is pretty straight forward and again allows us to have a lot of flexibility in what happens.

I had seen a few comments about performance in some of the other threads if we render this ourselves, but there doesn't seem to be any issue here. In a test it can parse, convert, and render 1,000 emojis inside of a large markdown table in about 100ms on my laptop (which is many more emojis than will ever be in any normal issue). This also prevents any flickering and other weirdness from using javascript to render some things while using go for others.

Not included here are image fall back URLS. I don't really think they are necessary for anything new being written in 2020. However, managing the emoji ourselves would allow us to add these as a feature later on if it seems necessary.

Fixes: https://github.com/go-gitea/gitea/issues/9182
Fixes: https://github.com/go-gitea/gitea/issues/8974
Fixes: https://github.com/go-gitea/gitea/issues/8953
Fixes: https://github.com/go-gitea/gitea/issues/6628
Fixes: https://github.com/go-gitea/gitea/issues/5130

* add new shared function emojiHTML

* don't increase emoji size in issue title

* Update templates/repo/issue/view_content/add_reaction.tmpl

Co-Authored-By: 6543 <6543@obermui.de>

* Support for emoji rendering in various templates

* Render code and review comments as they should be

* Better way to handle mail subjects

* insert unicode from tribute selection

* Add template helper for plain text when needed

* Use existing replace function I forgot about

* Don't include emoji greater than Unicode Version 12

Only include emoji and aliases in JSON

* Update build/generate-emoji.go

* Tweak regex slightly to really match everything including random invisible characters. Run tests for every emoji we have

* final updates

* code review

* code review

* hard code gitea custom emoji to match previous behavior

* Update .eslintrc

Co-Authored-By: silverwind <me@silverwind.io>

* disable preempt

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>

.eslintrc

@@ -20,9 +20,9 @@ globals:
   __webpack_public_path__: true
   CodeMirror: false
   Dropzone: false
-  emojify: false
   SimpleMDE: false
   u2fApi: false
+  Tribute: false
 
 overrides:
   - files: ["web_src/**/*.worker.js"]

build/generate-emoji.go

@@ -0,0 +1,184 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Copyright 2015 Kenneth Shaw
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"go/format"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+const (
+	gemojiURL         = "https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json"
+	maxUnicodeVersion = 12
+)
+
+var (
+	flagOut = flag.String("o", "modules/emoji/emoji_data.go", "out")
+)
+
+// Gemoji is a set of emoji data.
+type Gemoji []Emoji
+
+// Emoji represents a single emoji and associated data.
+type Emoji struct {
+	Emoji          string   `json:"emoji"`
+	Description    string   `json:"description,omitempty"`
+	Aliases        []string `json:"aliases"`
+	UnicodeVersion string   `json:"unicode_version,omitempty"`
+}
+
+// Don't include some fields in JSON
+func (e Emoji) MarshalJSON() ([]byte, error) {
+	type emoji Emoji
+	x := emoji(e)
+	x.UnicodeVersion = ""
+	x.Description = ""
+	return json.Marshal(x)
+}
+
+func main() {
+	var err error
+
+	flag.Parse()
+
+	// generate data
+	buf, err := generate()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// write
+	err = ioutil.WriteFile(*flagOut, buf, 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+var replacer = strings.NewReplacer(
+	"main.Gemoji", "Gemoji",
+	"main.Emoji", "\n",
+	"}}", "},\n}",
+	", Description:", ", ",
+	", Aliases:", ", ",
+	", UnicodeVersion:", ", ",
+)
+
+var emojiRE = regexp.MustCompile(`\{Emoji:"([^"]*)"`)
+
+func generate() ([]byte, error) {
+	var err error
+
+	// load gemoji data
+	res, err := http.Get(gemojiURL)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	// read all
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// unmarshal
+	var data Gemoji
+	err = json.Unmarshal(body, &data)
+	if err != nil {
+		return nil, err
+	}
+
+	var re = regexp.MustCompile(`keycap|registered|copyright`)
+	tmp := data[:0]
+
+	// filter out emoji that require greater than max unicode version
+	for i := range data {
+		val, _ := strconv.ParseFloat(data[i].UnicodeVersion, 64)
+		if int(val) <= maxUnicodeVersion {
+			// remove these keycaps for now they really complicate matching since
+			// they include normal letters in them
+			if re.MatchString(data[i].Description) {
+				continue
+			}
+			tmp = append(tmp, data[i])
+		}
+	}
+	data = tmp
+
+	sort.Slice(data, func(i, j int) bool {
+		return data[i].Aliases[0] < data[j].Aliases[0]
+	})
+
+	aliasPairs := make([]string, 0)
+	aliasMap := make(map[string]int, len(data))
+
+	for i, e := range data {
+		if e.Emoji == "" || len(e.Aliases) == 0 {
+			continue
+		}
+		for _, a := range e.Aliases {
+			if a == "" {
+				continue
+			}
+			aliasMap[a] = i
+			aliasPairs = append(aliasPairs, ":"+a+":", e.Emoji)
+		}
+	}
+
+	// gitea customizations
+	i, ok := aliasMap["tada"]
+	if ok {
+		data[i].Aliases = append(data[i].Aliases, "hooray")
+	}
+	i, ok = aliasMap["laughing"]
+	if ok {
+		data[i].Aliases = append(data[i].Aliases, "laugh")
+	}
+
+	// add header
+	str := replacer.Replace(fmt.Sprintf(hdr, gemojiURL, data))
+
+	// change the format of the unicode string
+	str = emojiRE.ReplaceAllStringFunc(str, func(s string) string {
+		var err error
+		s, err = strconv.Unquote(s[len("{Emoji:"):])
+		if err != nil {
+			panic(err)
+		}
+		return "{" + strconv.QuoteToASCII(s)
+	})
+
+	// write a JSON file to use with tribute
+	file, _ := json.Marshal(data)
+	_ = ioutil.WriteFile("assets/emoji.json", file, 0644)
+
+	// format
+	return format.Source([]byte(str))
+}
+
+const hdr = `
+// Copyright 2020 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 emoji
+
+// Code generated by gen.go. DO NOT EDIT.
+// Sourced from %s
+//
+var GemojiData = %#v
+`

custom/conf/app.ini.sample

@@ -171,8 +171,9 @@ SHOW_USER_EMAIL = true
 DEFAULT_THEME = gitea
 ; All available themes. Allow users select personalized themes regardless of the value of `DEFAULT_THEME`.
 THEMES = gitea,arc-green
-; All available reactions. Allow users react with different emoji's
+;All available reactions users can choose on issues/prs and comments.
-; For the whole list look at https://gitea.com/gitea/gitea.com/issues/8
+;Values can be emoji alias (:smile:) or a unicode emoji.
+;For custom reactions, add a tightly cropped square image to public/emoji/img/reaction_name.png
 REACTIONS = +1, -1, laugh, hooray, confused, heart, rocket, eyes
 ; Whether the full name of the users should be shown where possible. If the full name isn't set, the username will be used.
 DEFAULT_SHOW_FULL_NAME = false

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -128,7 +128,9 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `DEFAULT_THEME`: **gitea**: \[gitea, arc-green\]: Set the default theme for the Gitea install.
 - `THEMES`:  **gitea,arc-green**: All available themes. Allow users select personalized themes
   regardless of the value of `DEFAULT_THEME`.
-- `REACTIONS`: All available reactions. Allow users react with different emoji's.
+- `REACTIONS`: All available reactions users can choose on issues/prs and comments
+    Values can be emoji alias (:smile:) or a unicode emoji.
+    For custom reactions, add a tightly cropped square image to public/emoji/img/reaction_name.png
 - `DEFAULT_SHOW_FULL_NAME`: **false**: Whether the full name of the users should be shown where possible. If the full name isn't set, the username will be used.
 - `SEARCH_REPO_DESCRIPTION`: **true**: Whether to search within description at repository search on explore page.
 - `USE_SERVICE_WORKER`: **true**: Whether to enable a Service Worker to cache frontend assets.

docs/content/page/index.en-us.md

@@ -274,7 +274,6 @@ Windows, on architectures like amd64, i386, ARM, PowerPC, and others.
   * [DropzoneJS](http://www.dropzonejs.com/)
   * [Highlight](https://highlightjs.org/)
   * [Clipboard](https://zenorocha.github.io/clipboard.js/)
-  * [Emojify](https://github.com/Ranks/emojify.js)
   * [CodeMirror](https://codemirror.net/)
   * [jQuery Date Time Picker](https://github.com/xdan/datetimepicker)
   * [jQuery MiniColors](https://github.com/claviska/jquery-minicolors)

docs/content/page/index.fr-fr.md

@@ -263,7 +263,6 @@ Le but de ce projet est de fournir de la manière la plus simple, la plus rapide
   * [DropzoneJS](http://www.dropzonejs.com/)
   * [Highlight](https://highlightjs.org/)
   * [Clipboard](https://zenorocha.github.io/clipboard.js/)
-  * [Emojify](https://github.com/Ranks/emojify.js)
   * [CodeMirror](https://codemirror.net/)
   * [jQuery Date Time Picker](https://github.com/xdan/datetimepicker)
   * [jQuery MiniColors](https://github.com/claviska/jquery-minicolors)

docs/content/page/index.zh-cn.md

@@ -56,7 +56,6 @@ Gitea的首要目标是创建一个极易安装，运行非常快速，安装和
   * [DropzoneJS](http://www.dropzonejs.com/)
   * [Highlight](https://highlightjs.org/)
   * [Clipboard](https://zenorocha.github.io/clipboard.js/)
-  * [Emojify](https://github.com/Ranks/emojify.js)
   * [CodeMirror](https://codemirror.net/)
   * [jQuery Date Time Picker](https://github.com/xdan/datetimepicker)
   * [jQuery MiniColors](https://github.com/claviska/jquery-minicolors)

docs/content/page/index.zh-tw.md

@@ -56,7 +56,6 @@ Gitea 的首要目標是建立一個容易安裝，運行快速，安装和使
   * [DropzoneJS](http://www.dropzonejs.com/)
   * [Highlight](https://highlightjs.org/)
   * [Clipboard](https://zenorocha.github.io/clipboard.js/)
-  * [Emojify](https://github.com/Ranks/emojify.js)
   * [CodeMirror](https://codemirror.net/)
   * [jQuery Date Time Picker](https://github.com/xdan/datetimepicker)
   * [jQuery MiniColors](https://github.com/claviska/jquery-minicolors)

modules/emoji/emoji.go

@@ -0,0 +1,119 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Copyright 2015 Kenneth Shaw
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package emoji
+
+import (
+	"strings"
+	"sync"
+)
+
+// Gemoji is a set of emoji data.
+type Gemoji []Emoji
+
+// Emoji represents a single emoji and associated data.
+type Emoji struct {
+	Emoji          string
+	Description    string
+	Aliases        []string
+	UnicodeVersion string
+}
+
+var (
+	// codeMap provides a map of the emoji unicode code to its emoji data.
+	codeMap map[string]int
+
+	// aliasMap provides a map of the alias to its emoji data.
+	aliasMap map[string]int
+
+	// codeReplacer is the string replacer for emoji codes.
+	codeReplacer *strings.Replacer
+
+	// aliasReplacer is the string replacer for emoji aliases.
+	aliasReplacer *strings.Replacer
+
+	once sync.Once
+)
+
+func loadMap() {
+
+	once.Do(func() {
+
+		// initialize
+		codeMap = make(map[string]int, len(GemojiData))
+		aliasMap = make(map[string]int, len(GemojiData))
+
+		// process emoji codes and aliases
+		codePairs := make([]string, 0)
+		aliasPairs := make([]string, 0)
+		for i, e := range GemojiData {
+			if e.Emoji == "" || len(e.Aliases) == 0 {
+				continue
+			}
+
+			// setup codes
+			codeMap[e.Emoji] = i
+			codePairs = append(codePairs, e.Emoji, ":"+e.Aliases[0]+":")
+
+			// setup aliases
+			for _, a := range e.Aliases {
+				if a == "" {
+					continue
+				}
+
+				aliasMap[a] = i
+				aliasPairs = append(aliasPairs, ":"+a+":", e.Emoji)
+			}
+		}
+
+		// create replacers
+		codeReplacer = strings.NewReplacer(codePairs...)
+		aliasReplacer = strings.NewReplacer(aliasPairs...)
+	})
+}
+
+// FromCode retrieves the emoji data based on the provided unicode code (ie,
+// "\u2618" will return the Gemoji data for "shamrock").
+func FromCode(code string) *Emoji {
+	loadMap()
+	i, ok := codeMap[code]
+	if !ok {
+		return nil
+	}
+
+	return &GemojiData[i]
+}
+
+// FromAlias retrieves the emoji data based on the provided alias in the form
+// "alias" or ":alias:" (ie, "shamrock" or ":shamrock:" will return the Gemoji
+// data for "shamrock").
+func FromAlias(alias string) *Emoji {
+	loadMap()
+	if strings.HasPrefix(alias, ":") && strings.HasSuffix(alias, ":") {
+		alias = alias[1 : len(alias)-1]
+	}
+
+	i, ok := aliasMap[alias]
+	if !ok {
+		return nil
+	}
+
+	return &GemojiData[i]
+}
+
+// ReplaceCodes replaces all emoji codes with the first corresponding emoji
+// alias (in the form of ":alias:") (ie, "\u2618" will be converted to
+// ":shamrock:").
+func ReplaceCodes(s string) string {
+	loadMap()
+	return codeReplacer.Replace(s)
+}
+
+// ReplaceAliases replaces all aliases of the form ":alias:" with its
+// corresponding unicode value.
+func ReplaceAliases(s string) string {
+	loadMap()
+	return aliasReplacer.Replace(s)
+}

modules/emoji/emoji_test.go

@@ -0,0 +1,67 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Copyright 2015 Kenneth Shaw
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package emoji
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestDumpInfo(t *testing.T) {
+	t.Logf("codes: %d", len(codeMap))
+	t.Logf("aliases: %d", len(aliasMap))
+}
+
+func TestLookup(t *testing.T) {
+	a := FromCode("\U0001f37a")
+	b := FromCode("🍺")
+	c := FromAlias(":beer:")
+	d := FromAlias("beer")
+
+	if !reflect.DeepEqual(a, b) {
+		t.Errorf("a and b should equal")
+	}
+	if !reflect.DeepEqual(b, c) {
+		t.Errorf("b and c should equal")
+	}
+	if !reflect.DeepEqual(c, d) {
+		t.Errorf("c and d should equal")
+	}
+	if !reflect.DeepEqual(a, d) {
+		t.Errorf("a and d should equal")
+	}
+
+	m := FromCode("\U0001f44d")
+	n := FromAlias(":thumbsup:")
+	o := FromAlias("+1")
+
+	if !reflect.DeepEqual(m, n) {
+		t.Errorf("m and n should equal")
+	}
+	if !reflect.DeepEqual(n, o) {
+		t.Errorf("n and o should equal")
+	}
+	if !reflect.DeepEqual(m, o) {
+		t.Errorf("m and o should equal")
+	}
+}
+
+func TestReplacers(t *testing.T) {
+	tests := []struct {
+		f      func(string) string
+		v, exp string
+	}{
+		{ReplaceCodes, ":thumbsup: +1 for \U0001f37a! 🍺 \U0001f44d", ":thumbsup: +1 for :beer:! :beer: :+1:"},
+		{ReplaceAliases, ":thumbsup: +1 :+1: :beer:", "\U0001f44d +1 \U0001f44d \U0001f37a"},
+	}
+
+	for i, x := range tests {
+		s := x.f(x.v)
+		if s != x.exp {
+			t.Errorf("test %d `%s` expected `%s`, got: `%s`", i, x.v, x.exp, s)
+		}
+	}
+}

modules/git/command.go

@@ -98,7 +98,6 @@ func (c *Command) RunInDirTimeoutEnvFullPipeline(env []string, timeout time.Dura
 // RunInDirTimeoutEnvFullPipelineFunc executes the command in given directory with given timeout,
 // it pipes stdout and stderr to given io.Writer and passes in an io.Reader as stdin. Between cmd.Start and cmd.Wait the passed in function is run.
 func (c *Command) RunInDirTimeoutEnvFullPipelineFunc(env []string, timeout time.Duration, dir string, stdout, stderr io.Writer, stdin io.Reader, fn func(context.Context, context.CancelFunc) error) error {
-
 	if timeout == -1 {
 		timeout = DefaultCommandExecutionTimeout
 	}

modules/markup/html.go

@@ -6,6 +6,7 @@ package markup
 
 import (
 	"bytes"
+	"fmt"
 	"net/url"
 	"path"
 	"path/filepath"
@@ -13,6 +14,7 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/emoji"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup/common"
@@ -60,6 +62,13 @@ var (
 
 	// blackfriday extensions create IDs like fn:user-content-footnote
 	blackfridayExtRegex = regexp.MustCompile(`[^:]*:user-content-`)
+
+	// EmojiShortCodeRegex find emoji by alias like :smile:
+	EmojiShortCodeRegex = regexp.MustCompile(`\:[\w\+\-]+\:{1}`)
+
+	// find emoji literal: search all emoji hex range as many times as they appear as
+	// some emojis (skin color etc..) are just two or more chained together
+	emojiRegex = regexp.MustCompile(`[\x{1F000}-\x{1FFFF}|\x{2000}-\x{32ff}|\x{fe4e5}-\x{fe4ee}|\x{200D}|\x{FE0F}|\x{e0000}-\x{e007f}]+`)
 )
 
 // CSS class for action keywords (e.g. "closes: #1")
@@ -154,6 +163,8 @@ var defaultProcessors = []processor{
 	issueIndexPatternProcessor,
 	sha1CurrentPatternProcessor,
 	emailAddressProcessor,
+	emojiProcessor,
+	emojiShortCodeProcessor,
 }
 
 type postProcessCtx struct {
@@ -194,6 +205,8 @@ var commitMessageProcessors = []processor{
 	issueIndexPatternProcessor,
 	sha1CurrentPatternProcessor,
 	emailAddressProcessor,
+	emojiProcessor,
+	emojiShortCodeProcessor,
 }
 
 // RenderCommitMessage will use the same logic as PostProcess, but will disable
@@ -226,6 +239,13 @@ var commitMessageSubjectProcessors = []processor{
 	mentionProcessor,
 	issueIndexPatternProcessor,
 	sha1CurrentPatternProcessor,
+	emojiShortCodeProcessor,
+	emojiProcessor,
+}
+
+var emojiProcessors = []processor{
+	emojiShortCodeProcessor,
+	emojiProcessor,
 }
 
 // RenderCommitMessageSubject will use the same logic as PostProcess and
@@ -269,6 +289,17 @@ func RenderDescriptionHTML(
 	return ctx.postProcess(rawHTML)
 }
 
+// RenderEmoji for when we want to just process emoji and shortcodes
+// in various places it isn't already run through the normal markdown procesor
+func RenderEmoji(
+	rawHTML []byte,
+) ([]byte, error) {
+	ctx := &postProcessCtx{
+		procs: emojiProcessors,
+	}
+	return ctx.postProcess(rawHTML)
+}
+
 var byteBodyTag = []byte("<body>")
 var byteBodyTagClosing = []byte("</body>")
 
@@ -319,7 +350,12 @@ func (ctx *postProcessCtx) visitNode(node *html.Node, visitText bool) {
 		if attr.Key == "id" && !(strings.HasPrefix(attr.Val, "user-content-") || blackfridayExtRegex.MatchString(attr.Val)) {
 			node.Attr[idx].Val = "user-content-" + attr.Val
 		}
+
+		if attr.Key == "class" && attr.Val == "emoji" {
+			visitText = false
+		}
 	}
+
 	// We ignore code, pre and already generated links.
 	switch node.Type {
 	case html.TextNode:
@@ -406,6 +442,54 @@ func createKeyword(content string) *html.Node {
 	return span
 }
 
+func createEmoji(content, class, name string) *html.Node {
+	span := &html.Node{
+		Type: html.ElementNode,
+		Data: atom.Span.String(),
+		Attr: []html.Attribute{},
+	}
+	if class != "" {
+		span.Attr = append(span.Attr, html.Attribute{Key: "class", Val: class})
+	}
+	if name != "" {
+		span.Attr = append(span.Attr, html.Attribute{Key: "aria-label", Val: name})
+	}
+
+	text := &html.Node{
+		Type: html.TextNode,
+		Data: content,
+	}
+
+	span.AppendChild(text)
+	return span
+}
+
+func createCustomEmoji(alias, class string) *html.Node {
+
+	span := &html.Node{
+		Type: html.ElementNode,
+		Data: atom.Span.String(),
+		Attr: []html.Attribute{},
+	}
+	if class != "" {
+		span.Attr = append(span.Attr, html.Attribute{Key: "class", Val: class})
+		span.Attr = append(span.Attr, html.Attribute{Key: "aria-label", Val: alias})
+	}
+
+	img := &html.Node{
+		Type:     html.ElementNode,
+		DataAtom: atom.Img,
+		Data:     "img",
+		Attr:     []html.Attribute{},
+	}
+	if class != "" {
+		img.Attr = append(img.Attr, html.Attribute{Key: "src", Val: fmt.Sprintf(`%s/img/emoji/%s.png`, setting.StaticURLPrefix, alias)})
+	}
+
+	span.AppendChild(img)
+	return span
+}
+
 func createLink(href, content, class string) *html.Node {
 	a := &html.Node{
 		Type: html.ElementNode,
@@ -810,6 +894,45 @@ func fullSha1PatternProcessor(ctx *postProcessCtx, node *html.Node) {
 	replaceContent(node, start, end, createCodeLink(urlFull, text, "commit"))
 }
 
+// emojiShortCodeProcessor for rendering text like :smile: into emoji
+func emojiShortCodeProcessor(ctx *postProcessCtx, node *html.Node) {
+
+	m := EmojiShortCodeRegex.FindStringSubmatchIndex(node.Data)
+	if m == nil {
+		return
+	}
+
+	alias := node.Data[m[0]:m[1]]
+	alias = strings.Replace(alias, ":", "", -1)
+	converted := emoji.FromAlias(alias)
+	if converted == nil {
+		// check if this is a custom reaction
+		s := strings.Join(setting.UI.Reactions, " ") + "gitea"
+		if strings.Contains(s, alias) {
+			replaceContent(node, m[0], m[1], createCustomEmoji(alias, "emoji"))
+			return
+		}
+		return
+	}
+
+	replaceContent(node, m[0], m[1], createEmoji(converted.Emoji, "emoji", converted.Description))
+}
+
+// emoji processor to match emoji and add emoji class
+func emojiProcessor(ctx *postProcessCtx, node *html.Node) {
+	m := emojiRegex.FindStringSubmatchIndex(node.Data)
+
+	if m == nil {
+		return
+	}
+
+	codepoint := node.Data[m[0]:m[1]]
+	val := emoji.FromCode(codepoint)
+	if val != nil {
+		replaceContent(node, m[0], m[1], createEmoji(codepoint, "emoji", val.Description))
+	}
+}
+
 // sha1CurrentPatternProcessor renders SHA1 strings to corresponding links that
 // are assumed to be in the same repository.
 func sha1CurrentPatternProcessor(ctx *postProcessCtx, node *html.Node) {

modules/markup/html_test.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"
 
+	"code.gitea.io/gitea/modules/emoji"
 	. "code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/markup/markdown"
 	"code.gitea.io/gitea/modules/setting"
@@ -228,6 +229,50 @@ func TestRender_email(t *testing.T) {
 		`<p>email@domain..com</p>`)
 }
 
+func TestRender_emoji(t *testing.T) {
+	setting.AppURL = AppURL
+	setting.AppSubURL = AppSubURL
+	setting.StaticURLPrefix = AppURL
+
+	test := func(input, expected string) {
+		expected = strings.Replace(expected, "&", "&amp;", -1)
+		buffer := RenderString("a.md", input, setting.AppSubURL, nil)
+		assert.Equal(t, strings.TrimSpace(expected), strings.TrimSpace(buffer))
+	}
+
+	// Make sure we can successfully match every emoji in our dataset with regex
+	for i := range emoji.GemojiData {
+		test(
+			emoji.GemojiData[i].Emoji,
+			`<p><span class="emoji" aria-label="`+emoji.GemojiData[i].Description+`">`+emoji.GemojiData[i].Emoji+`</span></p>`)
+	}
+	for i := range emoji.GemojiData {
+		test(
+			":"+emoji.GemojiData[i].Aliases[0]+":",
+			`<p><span class="emoji" aria-label="`+emoji.GemojiData[i].Description+`">`+emoji.GemojiData[i].Emoji+`</span></p>`)
+	}
+
+	//Text that should be turned into or recognized as emoji
+	test(
+		":gitea:",
+		`<p><span class="emoji" aria-label="gitea"><img src="`+setting.StaticURLPrefix+`/img/emoji/gitea.png"/></span></p>`)
+
+	test(
+		"Some text with 😄 in the middle",
+		`<p>Some text with <span class="emoji" aria-label="grinning face with smiling eyes">😄</span> in the middle</p>`)
+	test(
+		"Some text with :smile: in the middle",
+		`<p>Some text with <span class="emoji" aria-label="grinning face with smiling eyes">😄</span> in the middle</p>`)
+
+	// should match nothing
+	test(
+		"2001:0db8:85a3:0000:0000:8a2e:0370:7334",
+		`<p>2001:0db8:85a3:0000:0000:8a2e:0370:7334</p>`)
+	test(
+		":not exist:",
+		`<p>:not exist:</p>`)
+}
+
 func TestRender_ShortLinks(t *testing.T) {
 	setting.AppURL = AppURL
 	setting.AppSubURL = AppSubURL

modules/markup/sanitizer.go

@@ -63,6 +63,10 @@ func ReplaceSanitizer() {
 	// Allow unlabelled labels
 	sanitizer.policy.AllowNoAttrs().OnElements("label")
 
+	// Allow classes for emojis
+	sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`emoji`)).OnElements("span")
+	sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`emoji`)).OnElements("img")
+
 	// Allow generally safe attributes
 	generalSafeAttrs := []string{"abbr", "accept", "accept-charset",
 		"accesskey", "action", "align", "alt",

modules/templates/helper.go

@@ -25,6 +25,7 @@ import (
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/emoji"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/repository"
@@ -139,6 +140,9 @@ func NewFuncMap() []template.FuncMap {
 		"RenderCommitMessageLink":        RenderCommitMessageLink,
 		"RenderCommitMessageLinkSubject": RenderCommitMessageLinkSubject,
 		"RenderCommitBody":               RenderCommitBody,
+		"RenderEmoji":                    RenderEmoji,
+		"RenderEmojiPlain":               emoji.ReplaceAliases,
+		"ReactionToEmoji":                ReactionToEmoji,
 		"RenderNote":                     RenderNote,
 		"IsMultilineCommitMessage":       IsMultilineCommitMessage,
 		"ThemeColorMetaTag": func() string {
@@ -512,6 +516,29 @@ func RenderCommitBody(msg, urlPrefix string, metas map[string]string) template.H
 	return template.HTML(renderedMessage)
 }
 
+// RenderEmoji renders html text with emoji post processors
+func RenderEmoji(text string) template.HTML {
+	renderedText, err := markup.RenderEmoji([]byte(template.HTMLEscapeString(text)))
+	if err != nil {
+		log.Error("RenderEmoji: %v", err)
+		return template.HTML("")
+	}
+	return template.HTML(renderedText)
+}
+
+//ReactionToEmoji renders emoji for use in reactions
+func ReactionToEmoji(reaction string) template.HTML {
+	val := emoji.FromCode(reaction)
+	if val != nil {
+		return template.HTML(val.Emoji)
+	}
+	val = emoji.FromAlias(reaction)
+	if val != nil {
+		return template.HTML(val.Emoji)
+	}
+	return template.HTML(fmt.Sprintf(`<img src=%s/img/emoji/%s.png></img>`, setting.StaticURLPrefix, reaction))
+}
+
 // RenderNote renders the contents of a git-notes file as a commit message.
 func RenderNote(msg, urlPrefix string, metas map[string]string) template.HTML {
 	cleanMsg := template.HTMLEscapeString(msg)

public/vendor/assets/noto-color-emoji/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
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+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      (d) If the Work includes a "NOTICE" text file as part of its
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
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+
+   END OF TERMS AND CONDITIONS
+
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+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+
+   Licensed under the Apache License, Version 2.0 (the "License");
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+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

public/vendor/librejs.html

@@ -50,11 +50,6 @@
           <td><a href="https://github.com/vuejs/vue/blob/dev/LICENSE">Expat</a></td>
           <td><a href="https://github.com/vuejs/vue/archive/v2.6.11.tar.gz">vue.js-v2.6.11.tar.gz</a></td>
         </tr>
-        <tr>
-          <td><a href="./plugins/emojify/emojify.custom.js">emojify.custom.js</a></td>
-          <td><a href="http://www.freebsd.org/copyright/freebsd-license.html">Expat</a></td>
-          <td><a href="https://github.com/Ranks/emojify.js/archive/1.1.0.tar.gz">emojify-1.1.0.tar.gz</a></td>
-        </tr>
         <tr>
           <td><a href="../js/dropzone.js">dropzone.js</a></td>
           <td><a href="https://github.com/enyo/dropzone/blob/master/LICENSE">MIT</a></td>

public/vendor/plugins/emojify/LICENSE

@@ -1,8 +0,0 @@
-THE MIT LICENSE (MIT)
-Copyright © 2014 Hassan Khan, http://hassankhan.me <contact@hassankhan.me>
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.