Add reactions to issues/PR and comments (#2856)

24 files changed, 677 insertions, 8 deletions

diff --git a/docs/content/page/index.en-us.md b/docs/content/page/index.en-us.md
index 638d6dfee4..9592830a3b 100644
--- a/docs/content/page/index.en-us.md
+++ b/docs/content/page/index.en-us.md
@@ -182,6 +182,7 @@ The goal of this project is to make the easiest, fastest, and most painless way
         - Labels
         - Assign issues
         - Track time
+        - Reactions
         - Filter
             - Open
             - Closed
diff --git a/models/fixtures/reaction.yml b/models/fixtures/reaction.yml
new file mode 100644
index 0000000000..ca780a73aa
--- /dev/null
+++ b/models/fixtures/reaction.yml
@@ -0,0 +1 @@
+[] # empty
diff --git a/models/helper.go b/models/helper.go
index 6e8580524a..a284424bb5 100644
--- a/models/helper.go
+++ b/models/helper.go
@@ -19,3 +19,11 @@ func valuesRepository(m map[int64]*Repository) []*Repository {
 	}
 	return values
 }
+
+func valuesUser(m map[int64]*User) []*User {
+	var values = make([]*User, 0, len(m))
+	for _, v := range m {
+		values = append(values, v)
+	}
+	return values
+}
diff --git a/models/issue.go b/models/issue.go
index 5f576be4a9..2119dcefd9 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -54,6 +54,7 @@ type Issue struct {
 
 	Attachments []*Attachment `xorm:"-"`
 	Comments    []*Comment    `xorm:"-"`
+	Reactions   ReactionList  `xorm:"-"`
 }
 
 // BeforeUpdate is invoked from XORM before updating this object.
@@ -155,6 +156,37 @@ func (issue *Issue) loadComments(e Engine) (err error) {
 	return err
 }
 
+func (issue *Issue) loadReactions(e Engine) (err error) {
+	if issue.Reactions != nil {
+		return nil
+	}
+	reactions, err := findReactions(e, FindReactionsOptions{
+		IssueID: issue.ID,
+	})
+	if err != nil {
+		return err
+	}
+	// Load reaction user data
+	if _, err := ReactionList(reactions).LoadUsers(); err != nil {
+		return err
+	}
+
+	// Cache comments to map
+	comments := make(map[int64]*Comment)
+	for _, comment := range issue.Comments {
+		comments[comment.ID] = comment
+	}
+	// Add reactions either to issue or comment
+	for _, react := range reactions {
+		if react.CommentID == 0 {
+			issue.Reactions = append(issue.Reactions, react)
+		} else if comment, ok := comments[react.CommentID]; ok {
+			comment.Reactions = append(comment.Reactions, react)
+		}
+	}
+	return nil
+}
+
 func (issue *Issue) loadAttributes(e Engine) (err error) {
 	if err = issue.loadRepo(e); err != nil {
 		return
@@ -192,10 +224,10 @@ func (issue *Issue) loadAttributes(e Engine) (err error) {
 	}
 
 	if err = issue.loadComments(e); err != nil {
-		return
+		return err
 	}
 
-	return nil
+	return issue.loadReactions(e)
 }
 
 // LoadAttributes loads the attribute of this issue.
diff --git a/models/issue_comment.go b/models/issue_comment.go
index 34c0ecdce5..aabeb9c8d4 100644
--- a/models/issue_comment.go
+++ b/models/issue_comment.go
@@ -107,6 +107,7 @@ type Comment struct {
 	CommitSHA string `xorm:"VARCHAR(40)"`
 
 	Attachments []*Attachment `xorm:"-"`
+	Reactions   ReactionList  `xorm:"-"`
 
 	// For view issue page.
 	ShowTag CommentTag `xorm:"-"`
@@ -287,6 +288,29 @@ func (c *Comment) MailParticipants(e Engine, opType ActionType, issue *Issue) (e
 	return nil
 }
 
+func (c *Comment) loadReactions(e Engine) (err error) {
+	if c.Reactions != nil {
+		return nil
+	}
+	c.Reactions, err = findReactions(e, FindReactionsOptions{
+		IssueID:   c.IssueID,
+		CommentID: c.ID,
+	})
+	if err != nil {
+		return err
+	}
+	// Load reaction user data
+	if _, err := c.Reactions.LoadUsers(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// LoadReactions loads comment reactions
+func (c *Comment) LoadReactions() error {
+	return c.loadReactions(x)
+}
+
 func createComment(e *xorm.Session, opts *CreateCommentOptions) (_ *Comment, err error) {
 	var LabelID int64
 	if opts.Label != nil {
diff --git a/models/issue_reaction.go b/models/issue_reaction.go
new file mode 100644
index 0000000000..358e0701b3
--- /dev/null
+++ b/models/issue_reaction.go
@@ -0,0 +1,255 @@
+// Copyright 2017 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 models
+
+import (
+	"bytes"
+	"fmt"
+	"time"
+
+	"github.com/go-xorm/builder"
+	"github.com/go-xorm/xorm"
+
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// Reaction represents a reactions on issues and comments.
+type Reaction struct {
+	ID          int64     `xorm:"pk autoincr"`
+	Type        string    `xorm:"INDEX UNIQUE(s) NOT NULL"`
+	IssueID     int64     `xorm:"INDEX UNIQUE(s) NOT NULL"`
+	CommentID   int64     `xorm:"INDEX UNIQUE(s)"`
+	UserID      int64     `xorm:"INDEX UNIQUE(s) NOT NULL"`
+	User        *User     `xorm:"-"`
+	Created     time.Time `xorm:"-"`
+	CreatedUnix int64     `xorm:"INDEX created"`
+}
+
+// AfterLoad is invoked from XORM after setting the values of all fields of this object.
+func (s *Reaction) AfterLoad() {
+	s.Created = time.Unix(s.CreatedUnix, 0).Local()
+}
+
+// FindReactionsOptions describes the conditions to Find reactions
+type FindReactionsOptions struct {
+	IssueID   int64
+	CommentID int64
+}
+
+func (opts *FindReactionsOptions) toConds() builder.Cond {
+	var cond = builder.NewCond()
+	if opts.IssueID > 0 {
+		cond = cond.And(builder.Eq{"reaction.issue_id": opts.IssueID})
+	}
+	if opts.CommentID > 0 {
+		cond = cond.And(builder.Eq{"reaction.comment_id": opts.CommentID})
+	}
+	return cond
+}
+
+func findReactions(e Engine, opts FindReactionsOptions) ([]*Reaction, error) {
+	reactions := make([]*Reaction, 0, 10)
+	sess := e.Where(opts.toConds())
+	return reactions, sess.
+		Asc("reaction.issue_id", "reaction.comment_id", "reaction.created_unix", "reaction.id").
+		Find(&reactions)
+}
+
+func createReaction(e *xorm.Session, opts *ReactionOptions) (*Reaction, error) {
+	reaction := &Reaction{
+		Type:    opts.Type,
+		UserID:  opts.Doer.ID,
+		IssueID: opts.Issue.ID,
+	}
+	if opts.Comment != nil {
+		reaction.CommentID = opts.Comment.ID
+	}
+	if _, err := e.Insert(reaction); err != nil {
+		return nil, err
+	}
+
+	return reaction, nil
+}
+
+// ReactionOptions defines options for creating or deleting reactions
+type ReactionOptions struct {
+	Type    string
+	Doer    *User
+	Issue   *Issue
+	Comment *Comment
+}
+
+// CreateReaction creates reaction for issue or comment.
+func CreateReaction(opts *ReactionOptions) (reaction *Reaction, err error) {
+	sess := x.NewSession()
+	defer sess.Close()
+	if err = sess.Begin(); err != nil {
+		return nil, err
+	}
+
+	reaction, err = createReaction(sess, opts)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = sess.Commit(); err != nil {
+		return nil, err
+	}
+	return reaction, nil
+}
+
+// CreateIssueReaction creates a reaction on issue.
+func CreateIssueReaction(doer *User, issue *Issue, content string) (*Reaction, error) {
+	return CreateReaction(&ReactionOptions{
+		Type:  content,
+		Doer:  doer,
+		Issue: issue,
+	})
+}
+
+// CreateCommentReaction creates a reaction on comment.
+func CreateCommentReaction(doer *User, issue *Issue, comment *Comment, content string) (*Reaction, error) {
+	return CreateReaction(&ReactionOptions{
+		Type:    content,
+		Doer:    doer,
+		Issue:   issue,
+		Comment: comment,
+	})
+}
+
+func deleteReaction(e *xorm.Session, opts *ReactionOptions) error {
+	reaction := &Reaction{
+		Type:    opts.Type,
+		UserID:  opts.Doer.ID,
+		IssueID: opts.Issue.ID,
+	}
+	if opts.Comment != nil {
+		reaction.CommentID = opts.Comment.ID
+	}
+	_, err := e.Delete(reaction)
+	return err
+}
+
+// DeleteReaction deletes reaction for issue or comment.
+func DeleteReaction(opts *ReactionOptions) error {
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	if err := deleteReaction(sess, opts); err != nil {
+		return err
+	}
+
+	return sess.Commit()
+}
+
+// DeleteIssueReaction deletes a reaction on issue.
+func DeleteIssueReaction(doer *User, issue *Issue, content string) error {
+	return DeleteReaction(&ReactionOptions{
+		Type:  content,
+		Doer:  doer,
+		Issue: issue,
+	})
+}
+
+// DeleteCommentReaction deletes a reaction on comment.
+func DeleteCommentReaction(doer *User, issue *Issue, comment *Comment, content string) error {
+	return DeleteReaction(&ReactionOptions{
+		Type:    content,
+		Doer:    doer,
+		Issue:   issue,
+		Comment: comment,
+	})
+}
+
+// ReactionList represents list of reactions
+type ReactionList []*Reaction
+
+// HasUser check if user has reacted
+func (list ReactionList) HasUser(userID int64) bool {
+	if userID == 0 {
+		return false
+	}
+	for _, reaction := range list {
+		if reaction.UserID == userID {
+			return true
+		}
+	}
+	return false
+}
+
+// GroupByType returns reactions grouped by type
+func (list ReactionList) GroupByType() map[string]ReactionList {
+	var reactions = make(map[string]ReactionList)
+	for _, reaction := range list {
+		reactions[reaction.Type] = append(reactions[reaction.Type], reaction)
+	}
+	return reactions
+}
+
+func (list ReactionList) getUserIDs() []int64 {
+	userIDs := make(map[int64]struct{}, len(list))
+	for _, reaction := range list {
+		if _, ok := userIDs[reaction.UserID]; !ok {
+			userIDs[reaction.UserID] = struct{}{}
+		}
+	}
+	return keysInt64(userIDs)
+}
+
+func (list ReactionList) loadUsers(e Engine) ([]*User, error) {
+	if len(list) == 0 {
+		return nil, nil
+	}
+
+	userIDs := list.getUserIDs()
+	userMaps := make(map[int64]*User, len(userIDs))
+	err := e.
+		In("id", userIDs).
+		Find(&userMaps)
+	if err != nil {
+		return nil, fmt.Errorf("find user: %v", err)
+	}
+
+	for _, reaction := range list {
+		if user, ok := userMaps[reaction.UserID]; ok {
+			reaction.User = user
+		} else {
+			reaction.User = NewGhostUser()
+		}
+	}
+	return valuesUser(userMaps), nil
+}
+
+// LoadUsers loads reactions' all users
+func (list ReactionList) LoadUsers() ([]*User, error) {
+	return list.loadUsers(x)
+}
+
+// GetFirstUsers returns first reacted user display names separated by comma
+func (list ReactionList) GetFirstUsers() string {
+	var buffer bytes.Buffer
+	var rem = setting.UI.ReactionMaxUserNum
+	for _, reaction := range list {
+		if buffer.Len() > 0 {
+			buffer.WriteString(", ")
+		}
+		buffer.WriteString(reaction.User.DisplayName())
+		if rem--; rem == 0 {
+			break
+		}
+	}
+	return buffer.String()
+}
+
+// GetMoreUserCount returns count of not shown users in reaction tooltip
+func (list ReactionList) GetMoreUserCount() int {
+	if len(list) <= setting.UI.ReactionMaxUserNum {
+		return 0
+	}
+	return len(list) - setting.UI.ReactionMaxUserNum
+}
diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index bccf6e6924..deded2f755 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -148,6 +148,8 @@ var migrations = []Migration{
 	NewMigration("add repo indexer status", addRepoIndexerStatus),
 	// v49 -> v50
 	NewMigration("add lfs lock table", addLFSLock),
+	// v50 -> v51
+	NewMigration("add reactions", addReactions),
 }
 
 // Migrate database to current version
diff --git a/models/migrations/v50.go b/models/migrations/v50.go
new file mode 100644
index 0000000000..7437cace25
--- /dev/null
+++ b/models/migrations/v50.go
@@ -0,0 +1,28 @@
+// Copyright 2017 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 migrations
+
+import (
+	"fmt"
+
+	"github.com/go-xorm/xorm"
+)
+
+func addReactions(x *xorm.Engine) error {
+	// Reaction see models/issue_reaction.go
+	type Reaction struct {
+		ID          int64  `xorm:"pk autoincr"`
+		Type        string `xorm:"INDEX UNIQUE(s) NOT NULL"`
+		IssueID     int64  `xorm:"INDEX UNIQUE(s) NOT NULL"`
+		CommentID   int64  `xorm:"INDEX UNIQUE(s)"`
+		UserID      int64  `xorm:"INDEX UNIQUE(s) NOT NULL"`
+		CreatedUnix int64  `xorm:"INDEX created"`
+	}
+
+	if err := x.Sync2(new(Reaction)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
+	return nil
+}
diff --git a/models/models.go b/models/models.go
index 8a3850b6ff..21bbdb7373 100644
--- a/models/models.go
+++ b/models/models.go
@@ -118,6 +118,7 @@ func init() {
 		new(DeletedBranch),
 		new(RepoIndexerStatus),
 		new(LFSLock),
+		new(Reaction),
 	)
 
 	gonicNames := []string{"SSL", "UID"}
diff --git a/models/user.go b/models/user.go
index 31af3747c0..61c2ac47a1 100644
--- a/models/user.go
+++ b/models/user.go
@@ -980,6 +980,7 @@ func deleteUser(e *xorm.Session, u *User) error {
 		&IssueUser{UID: u.ID},
 		&EmailAddress{UID: u.ID},
 		&UserOpenID{UID: u.ID},
+		&Reaction{UserID: u.ID},
 	); err != nil {
 		return fmt.Errorf("deleteBeans: %v", err)
 	}
diff --git a/modules/auth/repo_form.go b/modules/auth/repo_form.go
index f066fc630f..221f7221a4 100644
--- a/modules/auth/repo_form.go
+++ b/modules/auth/repo_form.go
@@ -268,6 +268,16 @@ func (f *CreateCommentForm) Validate(ctx *macaron.Context, errs binding.Errors)
 	return validate(errs, ctx.Data, f, ctx.Locale)
 }
 
+// ReactionForm form for adding and removing reaction
+type ReactionForm struct {
+	Content string `binding:"Required;In(+1,-1,laugh,confused,heart,hooray)"`
+}
+
+// Validate validates the fields
+func (f *ReactionForm) Validate(ctx *macaron.Context, errs binding.Errors) binding.Errors {
+	return validate(errs, ctx.Data, f, ctx.Locale)
+}
+
 //    _____  .__.__                   __
 //   /     \ |__|  |   ____   _______/  |_  ____   ____   ____
 //  /  \ /  \|  |  | _/ __ \ /  ___/\   __\/  _ \ /    \_/ __ \
diff --git a/modules/context/context.go b/modules/context/context.go
index 10a84cd9b1..d050d3a938 100644
--- a/modules/context/context.go
+++ b/modules/context/context.go
@@ -211,7 +211,7 @@ func Contexter() macaron.Handler {
 			ctx.Data["SignedUserName"] = ctx.User.Name
 			ctx.Data["IsAdmin"] = ctx.User.IsAdmin
 		} else {
-			ctx.Data["SignedUserID"] = 0
+			ctx.Data["SignedUserID"] = int64(0)
 			ctx.Data["SignedUserName"] = ""
 		}
 
diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index f8da952413..1eedfc1c93 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -256,6 +256,7 @@ var (
 		IssuePagingNum      int
 		RepoSearchPagingNum int
 		FeedMaxCommitNum    int
+		ReactionMaxUserNum  int
 		ThemeColorMetaTag   string
 		MaxDisplayFileSize  int64
 		ShowUserEmail       bool
@@ -279,6 +280,7 @@ var (
 		IssuePagingNum:      10,
 		RepoSearchPagingNum: 10,
 		FeedMaxCommitNum:    5,
+		ReactionMaxUserNum:  10,
 		ThemeColorMetaTag:   `#6cc644`,
 		MaxDisplayFileSize:  8388608,
 		Admin: struct {
diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 42e465aeaa..c8b872d9f5 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"container/list"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"html/template"
 	"mime"
@@ -162,6 +163,21 @@ func NewFuncMap() []template.FuncMap {
 			return setting.DisableGitHooks
 		},
 		"TrN": TrN,
+		"Dict": func(values ...interface{}) (map[string]interface{}, error) {
+			if len(values)%2 != 0 {
+				return nil, errors.New("invalid dict call")
+			}
+			dict := make(map[string]interface{}, len(values)/2)
+			for i := 0; i < len(values); i += 2 {
+				key, ok := values[i].(string)
+				if !ok {
+					return nil, errors.New("dict keys must be strings")
+				}
+				dict[key] = values[i+1]
+			}
+			return dict, nil
+		},
+		"Printf": fmt.Sprintf,
 	}}
 }
 
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index b22bcf3c28..c0d286f1fb 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -489,6 +489,8 @@ mirror_last_synced = Last Synced
 watchers = Watchers
 stargazers = Stargazers
 forks = Forks
+pick_reaction = Pick your reaction
+reactions_more = and %d more
 
 form.reach_limit_of_creation = You have already reached your limit of %d repositories.
 form.name_reserved = The repository name '%s' is reserved.
diff --git a/public/css/index.css b/public/css/index.css
index 91a38a5842..5e7e1c5278 100644
--- a/public/css/index.css
+++ b/public/css/index.css
@@ -1 +1 @@
-.emoji{width:1.5em;height:1.5em;display:inline-block;background-size:contain}body{font-family:"Helvetica Neue","Microsoft YaHei",Arial,Helvetica,sans-serif!important;background-color:#fff;overflow-y:scroll;-webkit-font-smoothing:antialiased}img{border-radius:3px}code,pre{font:12px Consolas,"Liberation Mono",Menlo,Courier,monospace}code.raw,pre.raw{padding:7px 12px;margin:10px 0;background-color:#f8f8f8;border:1px solid #ddd;border-radius:3px;font-size:13px;line-height:1.5;overflow:auto}code.wrap,pre.wrap{white-space:pre-wrap;-ms-word-break:break-all;word-break:break-all;overflow-wrap:break-word;word-wrap:break-word}.dont-break-out{overflow-wrap:break-word;word-wrap:break-word;-ms-word-break:break-all;word-break:break-all;-ms-hyphens:auto;-moz-hyphens:auto;-webkit-hyphens:auto;hyphens:auto}.full.height{padding:0;margin:0 0 -80px 0;min-height:100%}.following.bar{z-index:900;left:0;width:100%}.following.bar.light{background-color:#fff;border-bottom:1px solid #DDD;box-shadow:0 2px 3px rgba(0,0,0,.04)}.following.bar .column .menu{margin-top:0}.following.bar .top.menu a.item.brand{padding-left:0}.following.bar .brand .ui.mini.image{width:30px}.following.bar .top.menu .dropdown.item.active,.following.bar .top.menu .dropdown.item:hover,.following.bar .top.menu a.item:hover{background-color:transparent}.following.bar .top.menu a.item:hover{color:rgba(0,0,0,.45)}.following.bar .top.menu .menu{z-index:900}.following.bar .icon,.following.bar .octicon{margin-right:5px!important}.following.bar .head.link.item{padding-right:0!important}.following.bar .avatar>.ui.image{margin-right:0}.following.bar .avatar .octicon-triangle-down{margin-top:6.5px}.following.bar .searchbox{background-color:#f4f4f4!important}.following.bar .searchbox:focus{background-color:#e9e9e9!important}.following.bar .text .octicon{width:16px;text-align:center}.following.bar .right.menu .menu{left:auto;right:0}.following.bar .right.menu .dropdown 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.ui.segment.sub-menu .list{width:100%;display:flex}.repository .ui.segment.sub-menu .list .item{width:100%;border-radius:3px}.repository .ui.segment.sub-menu .list .item a{color:#000}.repository .ui.segment.sub-menu .list .item a:hover{color:#666}.repository .ui.segment.sub-menu .list .item.active{background:rgba(0,0,0,.05)}.repository .segment.reactions.dropdown .menu,.repository .select-reaction.dropdown .menu{right:0!important;left:auto!important}.repository .segment.reactions.dropdown .menu>.header,.repository .select-reaction.dropdown .menu>.header{margin:.75rem 0 .5rem}.repository .segment.reactions.dropdown .menu>.item,.repository .select-reaction.dropdown .menu>.item{float:left;padding:.5rem .5rem!important}.repository .segment.reactions.dropdown .menu>.item img.emoji,.repository .select-reaction.dropdown .menu>.item img.emoji{margin-right:0}.repository .segment.reactions{padding:.3em 1em}.repository .segment.reactions .ui.label{padding:.4em}.repository .segment.reactions .ui.label.disabled{cursor:default}.repository .segment.reactions .ui.label>img{height:1.5em!important}.repository .segment.reactions .select-reaction{float:none}.repository .segment.reactions .select-reaction:not(.active) a{display:none}.repository .segment.reactions:hover .select-reaction a{display:block}.user-cards .list{padding:0}.user-cards .list .item{list-style:none;width:32%;margin:10px 10px 10px 0;padding-bottom:14px;float:left}.user-cards .list .item .avatar{width:48px;height:48px;float:left;display:block;margin-right:10px}.user-cards .list .item .name{margin-top:0;margin-bottom:0;font-weight:400}.user-cards .list .item .meta{margin-top:5px}#search-repo-box .results .result .image,#search-user-box .results .result .image{float:left;margin-right:8px;width:2em;height:2em}#search-repo-box .results .result .content,#search-user-box .results .result .content{margin:6px 0}.issue-actions{display:none}.issue.list{list-style:none;padding-top:15px}.issue.list>.item{padding-top:15px;padding-bottom:10px;border-bottom:1px dashed #AAA}.issue.list>.item .title{color:#444;font-size:15px;font-weight:700;margin:0 6px}.issue.list>.item .title:hover{color:#000}.issue.list>.item .comment{padding-right:10px;color:#666}.issue.list>.item .desc{padding-top:5px;color:#999}.issue.list>.item .desc a.milestone{padding-left:5px;color:#999!important}.issue.list>.item .desc a.milestone:hover{color:#000!important}.issue.list>.item .desc .assignee{margin-top:-5px;margin-right:5px}.page.buttons{padding-top:15px}.ui.form .dropzone{width:100%;margin-bottom:10px;border:2px dashed #0087F7;box-shadow:none!important}.ui.form .dropzone .dz-error-message{top:140px}.settings .content{margin-top:2px}.settings .content .segment,.settings .content>.header{box-shadow:0 1px 2px 0 rgba(34,36,38,.15)}.settings .list>.item .green{color:#21BA45!important}.settings .list>.item:not(:first-child){border-top:1px solid #eaeaea;padding:1rem;margin:15px -1rem -1rem -1rem}.settings .list>.item>.mega-octicon{display:table-cell}.settings .list>.item>.mega-octicon+.content{display:table-cell;padding:0 0 0 .5em;vertical-align:top}.settings .list>.item .info{margin-top:10px}.settings .list>.item .info .tab.segment{border:none;padding:10px 0 0}.settings .list.key .meta{padding-top:5px;color:#666}.settings .list.email>.item:not(:first-child){min-height:60px}.settings .list.collaborator>.item{padding:0}.ui.vertical.menu .header.item{font-size:1.1em;background:#f0f0f0}.edit-label.modal .form .column,.new-label.segment .form .column{padding-right:0}.edit-label.modal .form .buttons,.new-label.segment .form .buttons{margin-left:auto;padding-top:15px}.edit-label.modal .form .color.picker.column,.new-label.segment .form .color.picker.column{width:auto}.edit-label.modal .form .color.picker.column .color-picker,.new-label.segment .form .color.picker.column .color-picker{height:35px;width:auto;padding-left:30px}.edit-label.modal .form .minicolors-swatch.minicolors-sprite,.new-label.segment .form .minicolors-swatch.minicolors-sprite{top:10px;left:10px;width:15px;height:15px}.edit-label.modal .form .precolors,.new-label.segment .form .precolors{padding-left:0;padding-right:0;margin:3px 10px auto 10px;width:120px}.edit-label.modal .form .precolors .color,.new-label.segment .form .precolors .color{float:left;width:15px;height:15px}#avatar-arrow:after,#avatar-arrow:before{right:100%;top:20px;border:solid transparent;content:" ";height:0;width:0;position:absolute;pointer-events:none}#avatar-arrow:before{border-right-color:#D4D4D5;border-width:9px;margin-top:-9px}#avatar-arrow:after{border-right-color:#f7f7f7;border-width:8px;margin-top:-8px}#delete-repo-modal .ui.message,#transfer-repo-modal .ui.message{width:100%!important}.tab-size-1{tab-size:1!important;-moz-tab-size:1!important}.tab-size-2{tab-size:2!important;-moz-tab-size:2!important}.tab-size-3{tab-size:3!important;-moz-tab-size:3!important}.tab-size-4{tab-size:4!important;-moz-tab-size:4!important}.tab-size-5{tab-size:5!important;-moz-tab-size:5!important}.tab-size-6{tab-size:6!important;-moz-tab-size:6!important}.tab-size-7{tab-size:7!important;-moz-tab-size:7!important}.tab-size-8{tab-size:8!important;-moz-tab-size:8!important}.tab-size-9{tab-size:9!important;-moz-tab-size:9!important}.tab-size-10{tab-size:10!important;-moz-tab-size:10!important}.tab-size-11{tab-size:11!important;-moz-tab-size:11!important}.tab-size-12{tab-size:12!important;-moz-tab-size:12!important}.tab-size-13{tab-size:13!important;-moz-tab-size:13!important}.tab-size-14{tab-size:14!important;-moz-tab-size:14!important}.tab-size-15{tab-size:15!important;-moz-tab-size:15!important}.tab-size-16{tab-size:16!important;-moz-tab-size:16!important}.stats-table{display:table;width:100%}.stats-table .table-cell{display:table-cell}.stats-table .table-cell.tiny{height:.5em}tbody.commit-list{vertical-align:baseline}.commit-body{white-space:pre-wrap}.CodeMirror{font:14px Consolas,"Liberation Mono",Menlo,Courier,monospace}.CodeMirror.cm-s-default{border-radius:3px;padding:0!important}.CodeMirror .cm-comment{background:inherit!important}.repository.file.editor .tab[data-tab=write]{padding:0!important}.repository.file.editor .tab[data-tab=write] .editor-toolbar{border:none!important}.repository.file.editor .tab[data-tab=write] .CodeMirror{border-left:none;border-right:none;border-bottom:none}.organization{padding-top:15px;padding-bottom:80px}.organization .head .ui.header .text{vertical-align:middle;font-size:1.6rem;margin-left:15px}.organization .head .ui.header .ui.right{margin-top:5px}.organization.new.org form{margin:auto;width:800px!important}.organization.new.org form .ui.message{text-align:center}.organization.new.org form .header{padding-left:280px!important}.organization.new.org form .inline.field>label{text-align:right;width:250px!important;word-wrap:break-word}.organization.new.org form .help{margin-left:265px!important}.organization.new.org form .optional .title{margin-left:250px!important}.organization.new.org form input,.organization.new.org form textarea{width:50%!important}.organization.new.org form .header{padding-left:0!important;text-align:center}.organization.options input{min-width:300px}.organization.profile #org-avatar{width:100px;height:100px;margin-right:15px}.organization.profile #org-info .ui.header{font-size:36px;margin-bottom:0}.organization.profile #org-info .desc{font-size:16px;margin-bottom:10px}.organization.profile #org-info .meta .item{display:inline-block;margin-right:10px}.organization.profile #org-info .meta .item .icon{margin-right:5px}.organization.profile .ui.top.header .ui.right{margin-top:0}.organization.profile .teams .item{padding:10px 15px}.organization.profile .members .ui.avatar,.organization.teams .members .ui.avatar{width:48px;height:48px;margin-right:5px}.organization.invite #invite-box{margin:auto;margin-top:50px;width:500px!important}.organization.invite #invite-box #search-user-box input{margin-left:0;width:300px}.organization.invite #invite-box .ui.button{margin-left:5px;margin-top:-3px}.organization.members .list .item{margin-left:0;margin-right:0;border-bottom:1px solid #eee}.organization.members .list .item .ui.avatar{width:48px;height:48px}.organization.members .list .item .meta{line-height:24px}.organization.teams .detail .item{padding:10px 15px}.organization.teams .detail .item:not(:last-child){border-bottom:1px solid #eee}.organization.teams .members .item,.organization.teams .repositories .item{padding:10px 20px;line-height:32px}.organization.teams .members .item:not(:last-child),.organization.teams .repositories .item:not(:last-child){border-bottom:1px solid #DDD}.organization.teams .members .item .button,.organization.teams .repositories .item .button{padding:9px 10px}.organization.teams #add-member-form input,.organization.teams #add-repo-form input{margin-left:0}.organization.teams #add-member-form .ui.button,.organization.teams #add-repo-form .ui.button{margin-left:5px;margin-top:-3px}.user:not(.icon){padding-top:15px;padding-bottom:80px}.user.profile .ui.card .username{display:block}.user.profile .ui.card .extra.content{padding:0}.user.profile .ui.card .extra.content ul{margin:0;padding:0}.user.profile .ui.card .extra.content ul li{padding:10px;list-style:none}.user.profile .ui.card .extra.content ul li:not(:last-child){border-bottom:1px solid #eaeaea}.user.profile .ui.card .extra.content ul li .octicon{margin-left:1px;margin-right:5px}.user.profile .ui.card .extra.content ul li.follow .ui.button{width:100%}.user.profile .ui.repository.list{margin-top:25px}.user.followers .header.name{font-size:20px;line-height:24px;vertical-align:middle}.user.followers .follow .ui.button{padding:8px 15px}.user.notification .octicon{float:left;font-size:2em}.user.notification .content{float:left;margin-left:7px}.user.notification table form{display:inline-block}.user.notification table button{padding:3px 3px 3px 5px}.user.notification table tr{cursor:pointer}.user.notification .octicon.green{color:#21ba45}.user.notification .octicon.red{color:#d01919}.user.notification .octicon.purple{color:#a333c8}.user.notification .octicon.blue{color:#2185d0}.user.link-account:not(.icon){padding-top:15px;padding-bottom:5px}.user.settings .iconFloat{float:left}.dashboard{padding-top:15px;padding-bottom:80px}.dashboard.feeds .context.user.menu,.dashboard.issues .context.user.menu{z-index:101;min-width:200px}.dashboard.feeds .context.user.menu .ui.header,.dashboard.issues .context.user.menu .ui.header{font-size:1rem;text-transform:none}.dashboard.feeds .filter.menu .item,.dashboard.issues .filter.menu .item{text-align:left}.dashboard.feeds .filter.menu .item .text,.dashboard.issues .filter.menu .item .text{height:16px;vertical-align:middle}.dashboard.feeds .filter.menu .item .text.truncate,.dashboard.issues .filter.menu .item .text.truncate{width:85%}.dashboard.feeds .filter.menu .item .floating.label,.dashboard.issues .filter.menu .item .floating.label{top:7px;left:90%;width:15%}.dashboard.feeds .filter.menu .jump.item,.dashboard.issues .filter.menu .jump.item{margin:1px;padding-right:0}.dashboard.feeds .filter.menu .menu,.dashboard.issues .filter.menu .menu{max-height:300px;overflow-x:auto;right:0!important;left:auto!important}.dashboard.feeds .ui.right .head.menu,.dashboard.issues .ui.right .head.menu{margin-top:-5px}.dashboard.feeds .ui.right .head.menu .item.active,.dashboard.issues .ui.right .head.menu .item.active{color:#d9453d}.dashboard .dashboard-repos{margin:0 1px}.feeds .news>.ui.grid{margin-left:auto;margin-right:auto}.feeds .news .ui.avatar{margin-top:13px}.feeds .news p{line-height:1em}.feeds .news .time-since{font-size:13px}.feeds .news .issue.title{width:80%}.feeds .news .push.news .content ul{font-size:13px;list-style:none;padding-left:10px}.feeds .news .push.news .content ul img{margin-bottom:-2px}.feeds .news .push.news .content ul .text.truncate{width:80%;margin-bottom:-5px}.feeds .news .commit-id{font-family:Consolas,monospace}.feeds .news code{padding:1px;font-size:85%;background-color:rgba(0,0,0,.04);border-radius:3px;word-break:break-all}.feeds .list .header .ui.label{margin-top:-4px;padding:4px 5px;font-weight:400}.feeds .list .header .plus.icon{margin-top:5px}.feeds .list ul{list-style:none;margin:0;padding-left:0}.feeds .list ul li:not(:last-child){border-bottom:1px solid #EAEAEA}.feeds .list ul li.private{background-color:#fcf8e9}.feeds .list ul li a{padding:6px 1.2em;display:block}.feeds .list ul li a .octicon{color:#888}.feeds .list ul li a .octicon.rear{font-size:15px}.feeds .list ul li a .star-num{font-size:12px}.feeds .list .repo-owner-name-list .item-name{max-width:70%;margin-bottom:-4px}.feeds .list #collaborative-repo-list .owner-and-repo{max-width:80%;margin-bottom:-5px}.feeds .list #collaborative-repo-list .owner-name{max-width:120px;margin-bottom:-5px}.admin{padding-top:15px;padding-bottom:80px}.admin .table.segment{padding:0;font-size:13px}.admin .table.segment:not(.striped){padding-top:5px}.admin .table.segment:not(.striped) thead th:last-child{padding-right:5px!important}.admin .table.segment th{padding-top:5px;padding-bottom:5px}.admin .table.segment:not(.select) td:first-of-type,.admin .table.segment:not(.select) th:first-of-type{padding-left:15px!important}.admin .ui.header,.admin .ui.segment{box-shadow:0 1px 2px 0 rgba(34,36,38,.15)}.admin.user .email{max-width:200px}.admin dl.admin-dl-horizontal{padding:20px;margin:0}.admin dl.admin-dl-horizontal dd{margin-left:275px}.admin dl.admin-dl-horizontal dt{font-weight:bolder;float:left;width:285px;clear:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.admin.config #test-mail-btn{margin-left:5px}.explore{padding-top:15px;padding-bottom:80px}.explore .navbar{justify-content:center;padding-top:15px!important;margin-top:-15px!important;margin-bottom:15px!important;background-color:#FAFAFA!important;border-width:1px!important}.explore .navbar .octicon{width:16px;text-align:center}.ui.repository.list .item{padding-bottom:25px}.ui.repository.list .item:not(:first-child){border-top:1px solid #eee;padding-top:25px}.ui.repository.list .item .ui.header{font-size:1.5rem;padding-bottom:10px}.ui.repository.list .item .ui.header .name{word-break:break-all}.ui.repository.list .item .ui.header .metas{color:#888;font-size:14px;font-weight:400}.ui.repository.list .item .ui.header .metas span:not(:last-child){margin-right:5px}.ui.repository.list .item .time{font-size:12px;color:grey}.ui.repository.branches .time{font-size:12px;color:grey}.ui.user.list .item{padding-bottom:25px}.ui.user.list .item:not(:first-child){border-top:1px solid #eee;padding-top:25px}.ui.user.list .item .ui.avatar.image{width:40px;height:40px}.ui.user.list .item .description{margin-top:5px}.ui.user.list .item .description .octicon:not(:first-child){margin-left:5px}.ui.user.list .item .description a{color:#333}.ui.user.list .item .description a:hover{text-decoration:underline}
\ No newline at end of file
diff --git a/public/js/index.js b/public/js/index.js
index fb31387544..c56030f349 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -117,6 +117,54 @@ function updateIssuesMeta(url, action, issueIds, elementId, afterSuccess) {
     })
 }
 
+function initReactionSelector(parent) {
+    var reactions = '';
+    if (!parent) {
+        parent = $(document);
+        reactions = '.reactions > ';
+    }
+
+    parent.find(reactions + 'a.label').popup({'position': 'bottom left', 'metadata': {'content': 'title', 'title': 'none'}});
+
+    parent.find('.select-reaction > .menu > .item, ' + reactions + 'a.label').on('click', function(e){
+        var vm = this;
+        e.preventDefault();
+
+        if ($(this).hasClass('disabled')) return;
+
+        var actionURL = $(this).hasClass('item') ?
+                $(this).closest('.select-reaction').data('action-url') :
+                $(this).data('action-url');
+        var url = actionURL + '/' + ($(this).hasClass('blue') ? 'unreact' : 'react');
+        $.ajax({
+            type: 'POST',
+            url: url,
+            data: {
+                '_csrf': csrf,
+                'content': $(this).data('content')
+            }
+        }).done(function(resp) {
+            if (resp && (resp.html || resp.empty)) {
+                var content = $(vm).closest('.content');
+                var react = content.find('.segment.reactions');
+                if (react.length > 0) {
+                    react.remove();
+                }
+                if (!resp.empty) {
+                    react = $('<div class="ui attached segment reactions"></div>').appendTo(content);
+                    react.html(resp.html);
+                    var hasEmoji = react.find('.has-emoji');
+                    for (var i = 0; i < hasEmoji.length; i++) {
+                        emojify.run(hasEmoji.get(i));
+                    }
+                    react.find('.dropdown').dropdown();
+                    initReactionSelector(react);
+                }
+            }
+        });
+    });
+}
+
 function initCommentForm() {
     if ($('.comment.form').length == 0) {
         return
@@ -594,6 +642,7 @@ function initRepository() {
             $('#status').val($statusButton.data('status-val'));
             $('#comment-form').submit();
         });
+        initReactionSelector();
     }
 
     // Diff
diff --git a/public/less/_repository.less b/public/less/_repository.less
index c60362b894..69fe86a912 100644
--- a/public/less/_repository.less
+++ b/public/less/_repository.less
@@ -548,7 +548,7 @@
                 }
                 .content {
                     margin-left: 4em;
-                    .header {
+                    > .header {
                         #avatar-arrow;
                         font-weight: normal;
                         padding: auto 15px;
@@ -1350,6 +1350,43 @@
             }
         }
     }
+    .segment.reactions, .select-reaction {
+        &.dropdown .menu {
+            right: 0!important;
+            left: auto!important;
+            > .header {
+                margin: 0.75rem 0 .5rem;
+            }
+            > .item {
+                float: left;
+                padding: .5rem .5rem !important;
+                img.emoji {
+                    margin-right: 0;
+                }
+            }
+        }
+    }
+    .segment.reactions {
+        padding: .3em 1em;
+        .ui.label {
+            padding: .4em;
+            &.disabled {
+                cursor: default;
+            }
+            > img {
+                height: 1.5em !important;
+            }
+        }
+        .select-reaction {
+            float: none;
+            &:not(.active) a {
+                display: none;
+            }
+        }
+        &:hover .select-reaction a {
+            display: block;
+        }
+    }
 }
 // End of .repository
 
diff --git a/routers/repo/issue.go b/routers/repo/issue.go
index b45d521e5b..884a805180 100644
--- a/routers/repo/issue.go
+++ b/routers/repo/issue.go
@@ -39,6 +39,8 @@ const (
 	tplMilestoneNew  base.TplName = "repo/issue/milestone_new"
 	tplMilestoneEdit base.TplName = "repo/issue/milestone_edit"
 
+	tplReactions base.TplName = "repo/issue/view_content/reactions"
+
 	issueTemplateKey = "IssueTemplate"
 )
 
@@ -726,9 +728,8 @@ func GetActionIssue(ctx *context.Context) *models.Issue {
 		ctx.NotFoundOrServerError("GetIssueByIndex", models.IsErrIssueNotExist, err)
 		return nil
 	}
-	if issue.IsPull && !ctx.Repo.Repository.UnitEnabled(models.UnitTypePullRequests) ||
-		!issue.IsPull && !ctx.Repo.Repository.UnitEnabled(models.UnitTypeIssues) {
-		ctx.Handle(404, "IssueOrPullRequestUnitNotAllowed", nil)
+	checkIssueRights(ctx, issue)
+	if ctx.Written() {
 		return nil
 	}
 	if err = issue.LoadAttributes(); err != nil {
@@ -738,6 +739,13 @@ func GetActionIssue(ctx *context.Context) *models.Issue {
 	return issue
 }
 
+func checkIssueRights(ctx *context.Context, issue *models.Issue) {
+	if issue.IsPull && !ctx.Repo.Repository.UnitEnabled(models.UnitTypePullRequests) ||
+		!issue.IsPull && !ctx.Repo.Repository.UnitEnabled(models.UnitTypeIssues) {
+		ctx.Handle(404, "IssueOrPullRequestUnitNotAllowed", nil)
+	}
+}
+
 func getActionIssues(ctx *context.Context) []*models.Issue {
 	commaSeparatedIssueIDs := ctx.Query("issue_ids")
 	if len(commaSeparatedIssueIDs) == 0 {
@@ -1259,3 +1267,146 @@ func DeleteMilestone(ctx *context.Context) {
 		"redirect": ctx.Repo.RepoLink + "/milestones",
 	})
 }
+
+// ChangeIssueReaction create a reaction for issue
+func ChangeIssueReaction(ctx *context.Context, form auth.ReactionForm) {
+	issue := GetActionIssue(ctx)
+	if ctx.Written() {
+		return
+	}
+
+	if ctx.HasError() {
+		ctx.Handle(500, "ChangeIssueReaction", errors.New(ctx.GetErrMsg()))
+		return
+	}
+
+	switch ctx.Params(":action") {
+	case "react":
+		reaction, err := models.CreateIssueReaction(ctx.User, issue, form.Content)
+		if err != nil {
+			log.Info("CreateIssueReaction: %s", err)
+			break
+		}
+		// Reload new reactions
+		issue.Reactions = nil
+		if err = issue.LoadAttributes(); err != nil {
+			log.Info("issue.LoadAttributes: %s", err)
+			break
+		}
+
+		log.Trace("Reaction for issue created: %d/%d/%d", ctx.Repo.Repository.ID, issue.ID, reaction.ID)
+	case "unreact":
+		if err := models.DeleteIssueReaction(ctx.User, issue, form.Content); err != nil {
+			ctx.Handle(500, "DeleteIssueReaction", err)
+			return
+		}
+
+		// Reload new reactions
+		issue.Reactions = nil
+		if err := issue.LoadAttributes(); err != nil {
+			log.Info("issue.LoadAttributes: %s", err)
+			break
+		}
+
+		log.Trace("Reaction for issue removed: %d/%d", ctx.Repo.Repository.ID, issue.ID)
+	default:
+		ctx.Handle(404, fmt.Sprintf("Unknown action %s", ctx.Params(":action")), nil)
+		return
+	}
+
+	if len(issue.Reactions) == 0 {
+		ctx.JSON(200, map[string]interface{}{
+			"empty": true,
+			"html":  "",
+		})
+		return
+	}
+
+	html, err := ctx.HTMLString(string(tplReactions), map[string]interface{}{
+		"ctx":       ctx.Data,
+		"ActionURL": fmt.Sprintf("%s/issues/%d/reactions", ctx.Repo.RepoLink, issue.Index),
+		"Reactions": issue.Reactions.GroupByType(),
+	})
+	if err != nil {
+		ctx.Handle(500, "ChangeIssueReaction.HTMLString", err)
+		return
+	}
+	ctx.JSON(200, map[string]interface{}{
+		"html": html,
+	})
+}
+
+// ChangeCommentReaction create a reaction for comment
+func ChangeCommentReaction(ctx *context.Context, form auth.ReactionForm) {
+	comment, err := models.GetCommentByID(ctx.ParamsInt64(":id"))
+	if err != nil {
+		ctx.NotFoundOrServerError("GetCommentByID", models.IsErrCommentNotExist, err)
+		return
+	}
+
+	issue, err := models.GetIssueByID(comment.IssueID)
+	checkIssueRights(ctx, issue)
+	if ctx.Written() {
+		return
+	}
+
+	if ctx.HasError() {
+		ctx.Handle(500, "ChangeCommentReaction", errors.New(ctx.GetErrMsg()))
+		return
+	}
+
+	switch ctx.Params(":action") {
+	case "react":
+		reaction, err := models.CreateCommentReaction(ctx.User, issue, comment, form.Content)
+		if err != nil {
+			log.Info("CreateCommentReaction: %s", err)
+			break
+		}
+		// Reload new reactions
+		comment.Reactions = nil
+		if err = comment.LoadReactions(); err != nil {
+			log.Info("comment.LoadReactions: %s", err)
+			break
+		}
+
+		log.Trace("Reaction for comment created: %d/%d/%d/%d", ctx.Repo.Repository.ID, issue.ID, comment.ID, reaction.ID)
+	case "unreact":
+		if err := models.DeleteCommentReaction(ctx.User, issue, comment, form.Content); err != nil {
+			ctx.Handle(500, "DeleteCommentReaction", err)
+			return
+		}
+
+		// Reload new reactions
+		comment.Reactions = nil
+		if err = comment.LoadReactions(); err != nil {
+			log.Info("comment.LoadReactions: %s", err)
+			break
+		}
+
+		log.Trace("Reaction for comment removed: %d/%d/%d", ctx.Repo.Repository.ID, issue.ID, comment.ID)
+	default:
+		ctx.Handle(404, fmt.Sprintf("Unknown action %s", ctx.Params(":action")), nil)
+		return
+	}
+
+	if len(comment.Reactions) == 0 {
+		ctx.JSON(200, map[string]interface{}{
+			"empty": true,
+			"html":  "",
+		})
+		return
+	}
+
+	html, err := ctx.HTMLString(string(tplReactions), map[string]interface{}{
+		"ctx":       ctx.Data,
+		"ActionURL": fmt.Sprintf("%s/comments/%d/reactions", ctx.Repo.RepoLink, comment.ID),
+		"Reactions": comment.Reactions.GroupByType(),
+	})
+	if err != nil {
+		ctx.Handle(500, "ChangeCommentReaction.HTMLString", err)
+		return
+	}
+	ctx.JSON(200, map[string]interface{}{
+		"html": html,
+	})
+}
diff --git a/routers/routes/routes.go b/routers/routes/routes.go
index 56d4b5393b..f4fb135629 100644
--- a/routers/routes/routes.go
+++ b/routers/routes/routes.go
@@ -495,6 +495,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 						m.Post("/cancel", repo.CancelStopwatch)
 					})
 				})
+				m.Post("/reactions/:action", bindIgnErr(auth.ReactionForm{}), repo.ChangeIssueReaction)
 			})
 
 			m.Post("/labels", reqRepoWriter, repo.UpdateIssueLabel)
@@ -505,6 +506,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 		m.Group("/comments/:id", func() {
 			m.Post("", repo.UpdateCommentContent)
 			m.Post("/delete", repo.DeleteComment)
+			m.Post("/reactions/:action", bindIgnErr(auth.ReactionForm{}), repo.ChangeCommentReaction)
 		}, context.CheckAnyUnit(models.UnitTypeIssues, models.UnitTypePullRequests))
 		m.Group("/labels", func() {
 			m.Post("/new", bindIgnErr(auth.CreateLabelForm{}), repo.NewLabel)
diff --git a/templates/repo/issue/view_content.tmpl b/templates/repo/issue/view_content.tmpl
index 7de9502242..795844d5d3 100644
--- a/templates/repo/issue/view_content.tmpl
+++ b/templates/repo/issue/view_content.tmpl
@@ -19,6 +19,7 @@
 					<div class="ui top attached header">
 						<span class="text grey"><a {{if gt .Issue.Poster.ID 0}}href="{{.Issue.Poster.HomeLink}}"{{end}}>{{.Issue.Poster.Name}}</a> {{.i18n.Tr "repo.issues.commented_at" .Issue.HashTag $createdStr | Safe}}</span>
 						<div class="ui right actions">
+							{{template "repo/issue/view_content/add_reaction" Dict "ctx" $ "ActionURL" (Printf "%s/issues/%d/reactions" $.RepoLink .Issue.Index) }}
 							{{if .IsIssueOwner}}
 								<div class="item action">
 									<a class="edit-content" href="#"><i class="octicon octicon-pencil"></i></a>
@@ -37,6 +38,12 @@
 						<div class="raw-content hide">{{.Issue.Content}}</div>
 						<div class="edit-content-zone hide" data-write="issue-{{.Issue.ID}}-write" data-preview="issue-{{.Issue.ID}}-preview" data-update-url="{{$.RepoLink}}/issues/{{.Issue.Index}}/content" data-context="{{.RepoLink}}"></div>
 					</div>
+					{{$reactions := .Issue.Reactions.GroupByType}}
+					{{if $reactions}}
+						<div class="ui attached segment reactions">
+							{{template "repo/issue/view_content/reactions" Dict "ctx" $ "ActionURL" (Printf "%s/issues/%d/reactions" $.RepoLink .Issue.Index) "Reactions" $reactions }}
+						</div>
+					{{end}}
 					{{if .Issue.Attachments}}
 						<div class="ui bottom attached segment">
 							<div class="ui small images">
diff --git a/templates/repo/issue/view_content/add_reaction.tmpl b/templates/repo/issue/view_content/add_reaction.tmpl
new file mode 100644
index 0000000000..626db5c261
--- /dev/null
+++ b/templates/repo/issue/view_content/add_reaction.tmpl
@@ -0,0 +1,18 @@
+{{if .ctx.IsSigned}}
+<div class="item action ui pointing top right select-reaction dropdown" data-action-url="{{ .ActionURL }}">
+	<a class="add-reaction">
+		<i class="octicon octicon-plus-small" style="width: 10px"></i>
+		<i class="octicon octicon-smiley"></i>
+	</a>
+	<div class="menu has-emoji">
+		<div class="header">{{ .ctx.i18n.Tr "repo.pick_reaction"}}</div>
+		<div class="divider"></div>
+		<div class="item" data-content="+1">:+1:</div>
+		<div class="item" data-content="-1">:-1:</div>
+		<div class="item" data-content="laugh">:laughing:</div>
+		<div class="item" data-content="confused">:confused:</div>
+		<div class="item" data-content="heart">:heart:</div>
+		<div class="item" data-content="hooray">:tada:</div>
+	</div>
+</div>
+{{end}}
diff --git a/templates/repo/issue/view_content/comments.tmpl b/templates/repo/issue/view_content/comments.tmpl
index 34609ceb31..f073fe8108 100644
--- a/templates/repo/issue/view_content/comments.tmpl
+++ b/templates/repo/issue/view_content/comments.tmpl
@@ -22,6 +22,7 @@
 								{{end}}
 							</div>
 						{{end}}
+						{{template "repo/issue/view_content/add_reaction" Dict "ctx" $ "ActionURL" (Printf "%s/comments/%d/reactions" $.RepoLink .ID) }}
 						{{if or $.IsRepositoryAdmin (eq .Poster.ID $.SignedUserID)}}
 							<div class="item action">
 								<a class="edit-content" href="#"><i class="octicon octicon-pencil"></i></a>
@@ -41,6 +42,12 @@
 					<div class="raw-content hide">{{.Content}}</div>
 					<div class="edit-content-zone hide" data-write="issuecomment-{{.ID}}-write" data-preview="issuecomment-{{.ID}}-preview" data-update-url="{{$.RepoLink}}/comments/{{.ID}}" data-context="{{$.RepoLink}}"></div>
 				</div>
+				{{$reactions := .Reactions.GroupByType}}
+				{{if $reactions}}
+					<div class="ui attached segment reactions">
+						{{template "repo/issue/view_content/reactions" Dict "ctx" $ "ActionURL" (Printf "%s/comments/%d/reactions" $.RepoLink .ID) "Reactions" $reactions }}
+					</div>
+				{{end}}
 				{{if .Attachments}}
 					<div class="ui bottom attached segment">
 						<div class="ui small images">
diff --git a/templates/repo/issue/view_content/reactions.tmpl b/templates/repo/issue/view_content/reactions.tmpl
new file mode 100644
index 0000000000..f4810f4849
--- /dev/null
+++ b/templates/repo/issue/view_content/reactions.tmpl
@@ -0,0 +1,15 @@
+{{range $key, $value := .Reactions}}
+	<a class="ui label basic{{if $value.HasUser $.ctx.SignedUserID}} blue{{end}}{{if not $.ctx.IsSigned}} disabled{{end}} has-emoji" data-title="{{$value.GetFirstUsers}}{{if gt ($value.GetMoreUserCount) 0}} {{ $.ctx.i18n.Tr "repo.reactions_more" $value.GetMoreUserCount}}{{end}}" data-content="{{ $key }}" data-action-url="{{ $.ActionURL }}">
+		{{if eq $key "hooray"}}
+			:tada:
+		{{else}}
+			{{if eq $key "laugh"}}
+				:laughing:
+			{{else}}
+				:{{$key}}:
+			{{end}}
+		{{end}}
+		{{len $value}}
+	</a>
+{{end}}
+{{template "repo/issue/view_content/add_reaction" Dict "ctx" $.ctx "ActionURL" .ActionURL }}