PLT-4938 Add app package and move logic over from api package (#4931)

* Add app package and move logic over from api package

* Change app package functions to return errors

* Move non-api tests into app package

* Fix merge

app/webhook.go

@@ -0,0 +1,155 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"crypto/tls"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/utils"
+)
+
+const (
+	TRIGGERWORDS_FULL       = 0
+	TRIGGERWORDS_STARTSWITH = 1
+)
+
+func handleWebhookEvents(post *model.Post, team *model.Team, channel *model.Channel, user *model.User) *model.AppError {
+	if !utils.Cfg.ServiceSettings.EnableOutgoingWebhooks {
+		return nil
+	}
+
+	if channel.Type != model.CHANNEL_OPEN {
+		return nil
+	}
+
+	hchan := Srv.Store.Webhook().GetOutgoingByTeam(team.Id)
+	result := <-hchan
+	if result.Err != nil {
+		return result.Err
+	}
+
+	hooks := result.Data.([]*model.OutgoingWebhook)
+	if len(hooks) == 0 {
+		return nil
+	}
+
+	splitWords := strings.Fields(post.Message)
+	if len(splitWords) == 0 {
+		return nil
+	}
+	firstWord := splitWords[0]
+
+	relevantHooks := []*model.OutgoingWebhook{}
+	for _, hook := range hooks {
+		if hook.ChannelId == post.ChannelId || len(hook.ChannelId) == 0 {
+			if hook.ChannelId == post.ChannelId && len(hook.TriggerWords) == 0 {
+				relevantHooks = append(relevantHooks, hook)
+			} else if hook.TriggerWhen == TRIGGERWORDS_FULL && hook.HasTriggerWord(firstWord) {
+				relevantHooks = append(relevantHooks, hook)
+			} else if hook.TriggerWhen == TRIGGERWORDS_STARTSWITH && hook.TriggerWordStartsWith(firstWord) {
+				relevantHooks = append(relevantHooks, hook)
+			}
+		}
+	}
+
+	for _, hook := range relevantHooks {
+		go func(hook *model.OutgoingWebhook) {
+			payload := &model.OutgoingWebhookPayload{
+				Token:       hook.Token,
+				TeamId:      hook.TeamId,
+				TeamDomain:  team.Name,
+				ChannelId:   post.ChannelId,
+				ChannelName: channel.Name,
+				Timestamp:   post.CreateAt,
+				UserId:      post.UserId,
+				UserName:    user.Username,
+				PostId:      post.Id,
+				Text:        post.Message,
+				TriggerWord: firstWord,
+			}
+			var body io.Reader
+			var contentType string
+			if hook.ContentType == "application/json" {
+				body = strings.NewReader(payload.ToJSON())
+				contentType = "application/json"
+			} else {
+				body = strings.NewReader(payload.ToFormValues())
+				contentType = "application/x-www-form-urlencoded"
+			}
+			tr := &http.Transport{
+				TLSClientConfig: &tls.Config{InsecureSkipVerify: *utils.Cfg.ServiceSettings.EnableInsecureOutgoingConnections},
+			}
+			client := &http.Client{Transport: tr}
+
+			for _, url := range hook.CallbackURLs {
+				go func(url string) {
+					req, _ := http.NewRequest("POST", url, body)
+					req.Header.Set("Content-Type", contentType)
+					req.Header.Set("Accept", "application/json")
+					if resp, err := client.Do(req); err != nil {
+						l4g.Error(utils.T("api.post.handle_webhook_events_and_forget.event_post.error"), err.Error())
+					} else {
+						defer func() {
+							ioutil.ReadAll(resp.Body)
+							resp.Body.Close()
+						}()
+						respProps := model.MapFromJson(resp.Body)
+
+						if text, ok := respProps["text"]; ok {
+							if _, err := CreateWebhookPost(hook.CreatorId, hook.TeamId, post.ChannelId, text, respProps["username"], respProps["icon_url"], post.Props, post.Type); err != nil {
+								l4g.Error(utils.T("api.post.handle_webhook_events_and_forget.create_post.error"), err)
+							}
+						}
+					}
+				}(url)
+			}
+
+		}(hook)
+	}
+
+	return nil
+}
+
+func CreateWebhookPost(userId, teamId, channelId, text, overrideUsername, overrideIconUrl string, props model.StringInterface, postType string) (*model.Post, *model.AppError) {
+	post := &model.Post{UserId: userId, ChannelId: channelId, Message: text, Type: postType}
+	post.AddProp("from_webhook", "true")
+
+	if utils.Cfg.ServiceSettings.EnablePostUsernameOverride {
+		if len(overrideUsername) != 0 {
+			post.AddProp("override_username", overrideUsername)
+		} else {
+			post.AddProp("override_username", model.DEFAULT_WEBHOOK_USERNAME)
+		}
+	}
+
+	if utils.Cfg.ServiceSettings.EnablePostIconOverride {
+		if len(overrideIconUrl) != 0 {
+			post.AddProp("override_icon_url", overrideIconUrl)
+		}
+	}
+
+	post.Message = parseSlackLinksToMarkdown(post.Message)
+
+	if len(props) > 0 {
+		for key, val := range props {
+			if key == "attachments" {
+				parseSlackAttachment(post, val)
+			} else if key != "override_icon_url" && key != "override_username" && key != "from_webhook" {
+				post.AddProp(key, val)
+			}
+		}
+	}
+
+	if _, err := CreatePost(post, teamId, false); err != nil {
+		return nil, model.NewLocAppError("CreateWebhookPost", "api.post.create_webhook_post.creating.app_error", nil, "err="+err.Message)
+	}
+
+	return post, nil
+}