Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/web/webhook.go

@@ -0,0 +1,135 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package web
+
+import (
+	"encoding/json"
+	"io"
+	"mime"
+	"net/http"
+	"strings"
+
+	"github.com/gorilla/mux"
+	"github.com/gorilla/schema"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+func (w *Web) InitWebhooks() {
+	w.MainRouter.Handle("/hooks/commands/{id:[A-Za-z0-9]+}", w.APIHandlerTrustRequester(commandWebhook)).Methods("POST")
+	w.MainRouter.Handle("/hooks/{id:[A-Za-z0-9]+}", w.APIHandlerTrustRequester(incomingWebhook)).Methods("POST")
+}
+
+func incomingWebhook(c *Context, w http.ResponseWriter, r *http.Request) {
+	params := mux.Vars(r)
+	id := params["id"]
+
+	r.ParseForm()
+
+	var err *model.AppError
+	var mediaType string
+	incomingWebhookPayload := &model.IncomingWebhookRequest{}
+	contentType := r.Header.Get("Content-Type")
+	// Content-Type header is optional so could be empty
+	if contentType != "" {
+		var mimeErr error
+		mediaType, _, mimeErr = mime.ParseMediaType(contentType)
+		if mimeErr != nil && mimeErr != mime.ErrInvalidMediaParameter {
+			c.Err = model.NewAppError("incomingWebhook",
+				"api.webhook.incoming.error",
+				nil,
+				"webhook_id="+id+", error: "+mimeErr.Error(),
+				http.StatusBadRequest,
+			)
+			return
+		}
+	}
+
+	defer func() {
+		if *c.App.Config().LogSettings.EnableWebhookDebugging {
+			if c.Err != nil {
+				fields := []mlog.Field{mlog.String("webhook_id", id), mlog.String("request_id", c.AppContext.RequestId())}
+				payload, err := json.Marshal(incomingWebhookPayload)
+				if err != nil {
+					fields = append(fields, mlog.NamedErr("encoding_err", err))
+				} else {
+					fields = append(fields, mlog.String("payload", string(payload)))
+				}
+
+				mlog.Debug("Incoming webhook received", fields...)
+			}
+		}
+	}()
+
+	if mediaType == "application/x-www-form-urlencoded" {
+		payload := strings.NewReader(r.FormValue("payload"))
+
+		incomingWebhookPayload, err = decodePayload(payload)
+		if err != nil {
+			c.Err = err
+			return
+		}
+	} else if mediaType == "multipart/form-data" {
+		r.ParseMultipartForm(0)
+
+		decoder := schema.NewDecoder()
+		err := decoder.Decode(incomingWebhookPayload, r.PostForm)
+
+		if err != nil {
+			c.Err = model.NewAppError("incomingWebhook",
+				"api.webhook.incoming.error",
+				nil,
+				"webhook_id="+id+", error: "+err.Error(),
+				http.StatusBadRequest,
+			)
+			return
+		}
+	} else {
+		incomingWebhookPayload, err = decodePayload(r.Body)
+		if err != nil {
+			c.Err = err
+			return
+		}
+	}
+
+	err = c.App.HandleIncomingWebhook(c.AppContext, id, incomingWebhookPayload)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	w.Header().Set("Content-Type", "text/plain")
+	w.Write([]byte("ok"))
+}
+
+func commandWebhook(c *Context, w http.ResponseWriter, r *http.Request) {
+	params := mux.Vars(r)
+	id := params["id"]
+
+	response, err := model.CommandResponseFromHTTPBody(r.Header.Get("Content-Type"), r.Body)
+	if err != nil {
+		c.Err = model.NewAppError("commandWebhook", "web.command_webhook.parse.app_error", nil, "", http.StatusBadRequest).Wrap(err)
+		return
+	}
+
+	appErr := c.App.HandleCommandWebhook(c.AppContext, id, response)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	w.Header().Set("Content-Type", "text/plain")
+	w.Write([]byte("ok"))
+}
+
+func decodePayload(payload io.Reader) (*model.IncomingWebhookRequest, *model.AppError) {
+	incomingWebhookPayload, decodeError := model.IncomingWebhookRequestFromJSON(payload)
+
+	if decodeError != nil {
+		return nil, decodeError
+	}
+
+	return incomingWebhookPayload, nil
+}