From e841d0c5023640efc3dcf9d5284f55458e06a0a6 Mon Sep 17 00:00:00 2001
From: Saturnino Abril <saturnino.abril@gmail.com>
Date: Tue, 11 Apr 2017 22:14:33 +0900
Subject: APIv4 GET /posts/{post_id}/reactions (#6047)

---
 api4/api.go           |  1 +
 api4/reaction.go      | 39 ++++++++++++++++++++++
 api4/reaction_test.go | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++
 app/reaction.go       | 16 +++++++++
 model/client4.go      | 12 +++++++
 5 files changed, 157 insertions(+)
 create mode 100644 api4/reaction.go
 create mode 100644 api4/reaction_test.go
 create mode 100644 app/reaction.go

diff --git a/api4/api.go b/api4/api.go
index 6451e4102..b1b8e0c69 100644
--- a/api4/api.go
+++ b/api4/api.go
@@ -177,6 +177,7 @@ func InitApi(full bool) {
 	InitStatus()
 	InitWebSocket()
 	InitEmoji()
+	InitReaction()
 
 	app.Srv.Router.Handle("/api/v4/{anything:.*}", http.HandlerFunc(Handle404))
 
diff --git a/api4/reaction.go b/api4/reaction.go
new file mode 100644
index 000000000..b60b98f47
--- /dev/null
+++ b/api4/reaction.go
@@ -0,0 +1,39 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api4
+
+import (
+	"net/http"
+
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/app"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/utils"
+)
+
+func InitReaction() {
+	l4g.Debug(utils.T("api.reaction.init.debug"))
+
+	BaseRoutes.Post.Handle("/reactions", ApiSessionRequired(getReactions)).Methods("GET")
+}
+
+func getReactions(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequirePostId()
+	if c.Err != nil {
+		return
+	}
+
+	if !app.SessionHasPermissionToChannelByPost(c.Session, c.Params.PostId, model.PERMISSION_READ_CHANNEL) {
+		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+		return
+	}
+
+	if reactions, err := app.GetReactionsForPost(c.Params.PostId); err != nil {
+		c.Err = err
+		return
+	} else {
+		w.Write([]byte(model.ReactionsToJson(reactions)))
+		return
+	}
+}
diff --git a/api4/reaction_test.go b/api4/reaction_test.go
new file mode 100644
index 000000000..457b905da
--- /dev/null
+++ b/api4/reaction_test.go
@@ -0,0 +1,89 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api4
+
+import (
+	"testing"
+
+	"reflect"
+
+	"github.com/mattermost/platform/app"
+	"github.com/mattermost/platform/model"
+)
+
+func TestGetReactions(t *testing.T) {
+	th := Setup().InitBasic().InitSystemAdmin()
+	defer TearDown()
+	Client := th.Client
+	userId := th.BasicUser.Id
+	user2Id := th.BasicUser2.Id
+	postId := th.BasicPost.Id
+
+	userReactions := []*model.Reaction{
+		{
+			UserId:    userId,
+			PostId:    postId,
+			EmojiName: "smile",
+		},
+		{
+			UserId:    userId,
+			PostId:    postId,
+			EmojiName: "happy",
+		},
+		{
+			UserId:    userId,
+			PostId:    postId,
+			EmojiName: "sad",
+		},
+		{
+			UserId:    user2Id,
+			PostId:    postId,
+			EmojiName: "smile",
+		},
+		{
+			UserId:    user2Id,
+			PostId:    postId,
+			EmojiName: "sad",
+		},
+	}
+
+	var reactions []*model.Reaction
+
+	for _, userReaction := range userReactions {
+		if result := <-app.Srv.Store.Reaction().Save(userReaction); result.Err != nil {
+			t.Fatal(result.Err)
+		} else {
+			reactions = append(reactions, result.Data.(*model.Reaction))
+		}
+	}
+
+	rr, resp := Client.GetReactions(postId)
+	CheckNoError(t, resp)
+
+	if len(rr) != 5 {
+		t.Fatal("reactions should returned correct length")
+	}
+
+	if !reflect.DeepEqual(rr, reactions) {
+		t.Fatal("reactions should have matched")
+	}
+
+	rr, resp = Client.GetReactions("junk")
+	CheckBadRequestStatus(t, resp)
+
+	if len(rr) != 0 {
+		t.Fatal("reactions should return empty")
+	}
+
+	_, resp = Client.GetReactions(GenerateTestId())
+	CheckForbiddenStatus(t, resp)
+
+	Client.Logout()
+
+	_, resp = Client.GetReactions(postId)
+	CheckUnauthorizedStatus(t, resp)
+
+	_, resp = th.SystemAdminClient.GetReactions(postId)
+	CheckNoError(t, resp)
+}
diff --git a/app/reaction.go b/app/reaction.go
new file mode 100644
index 000000000..4f299a993
--- /dev/null
+++ b/app/reaction.go
@@ -0,0 +1,16 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/platform/model"
+)
+
+func GetReactionsForPost(postId string) ([]*model.Reaction, *model.AppError) {
+	if result := <-Srv.Store.Reaction().GetForPost(postId, true); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.([]*model.Reaction), nil
+	}
+}
diff --git a/model/client4.go b/model/client4.go
index f078a33fe..c917e6cca 100644
--- a/model/client4.go
+++ b/model/client4.go
@@ -2311,3 +2311,15 @@ func (c *Client4) GetEmojiList() ([]*Emoji, *Response) {
 		return EmojiListFromJson(r.Body), BuildResponse(r)
 	}
 }
+
+// Reaction Section
+
+// GetReactions returns a list of reactions to a post.
+func (c *Client4) GetReactions(postId string) ([]*Reaction, *Response) {
+	if r, err := c.DoApiGet(c.GetPostRoute(postId)+"/reactions", ""); err != nil {
+		return nil, &Response{StatusCode: r.StatusCode, Error: err}
+	} else {
+		defer closeBody(r)
+		return ReactionsFromJson(r.Body), BuildResponse(r)
+	}
+}
-- 
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