github.com/jlevesy/mattermost-server@v5.3.2-0.20181003190404-7468f35cb0c8+incompatible/app/plugin_requests.go (about)

     1  // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
     2  // See LICENSE.txt for license information.
     3  
     4  package app
     5  
     6  import (
     7  	"net/http"
     8  	"path"
     9  	"strings"
    10  
    11  	"bytes"
    12  	"github.com/gorilla/mux"
    13  	"github.com/mattermost/mattermost-server/mlog"
    14  	"github.com/mattermost/mattermost-server/model"
    15  	"github.com/mattermost/mattermost-server/plugin"
    16  	"github.com/mattermost/mattermost-server/utils"
    17  	"io/ioutil"
    18  )
    19  
    20  func (a *App) ServePluginRequest(w http.ResponseWriter, r *http.Request) {
    21  	if a.Plugins == nil || !*a.Config().PluginSettings.Enable {
    22  		err := model.NewAppError("ServePluginRequest", "app.plugin.disabled.app_error", nil, "Enable plugins to serve plugin requests", http.StatusNotImplemented)
    23  		a.Log.Error(err.Error())
    24  		w.WriteHeader(err.StatusCode)
    25  		w.Header().Set("Content-Type", "application/json")
    26  		w.Write([]byte(err.ToJson()))
    27  		return
    28  	}
    29  
    30  	params := mux.Vars(r)
    31  	hooks, err := a.Plugins.HooksForPlugin(params["plugin_id"])
    32  	if err != nil {
    33  		a.Log.Error("Access to route for non-existent plugin", mlog.String("missing_plugin_id", params["plugin_id"]), mlog.Err(err))
    34  		http.NotFound(w, r)
    35  		return
    36  	}
    37  
    38  	a.servePluginRequest(w, r, hooks.ServeHTTP)
    39  }
    40  
    41  func (a *App) servePluginRequest(w http.ResponseWriter, r *http.Request, handler func(*plugin.Context, http.ResponseWriter, *http.Request)) {
    42  	token := ""
    43  	context := &plugin.Context{}
    44  	cookieAuth := false
    45  
    46  	authHeader := r.Header.Get(model.HEADER_AUTH)
    47  	if strings.HasPrefix(strings.ToUpper(authHeader), model.HEADER_BEARER+" ") {
    48  		token = authHeader[len(model.HEADER_BEARER)+1:]
    49  	} else if strings.HasPrefix(strings.ToLower(authHeader), model.HEADER_TOKEN+" ") {
    50  		token = authHeader[len(model.HEADER_TOKEN)+1:]
    51  	} else if cookie, _ := r.Cookie(model.SESSION_COOKIE_TOKEN); cookie != nil {
    52  		token = cookie.Value
    53  		cookieAuth = true
    54  	} else {
    55  		token = r.URL.Query().Get("access_token")
    56  	}
    57  
    58  	r.Header.Del("Mattermost-User-Id")
    59  	if token != "" {
    60  		session, err := a.GetSession(token)
    61  		csrfCheckPassed := true
    62  
    63  		if err == nil && cookieAuth && r.Method != "GET" && r.Header.Get(model.HEADER_REQUESTED_WITH) != model.HEADER_REQUESTED_WITH_XML {
    64  			bodyBytes, _ := ioutil.ReadAll(r.Body)
    65  			r.Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes))
    66  			r.ParseForm()
    67  			sentToken := r.FormValue("csrf")
    68  			expectedToken := session.GetCSRF()
    69  
    70  			if sentToken != expectedToken {
    71  				csrfCheckPassed = false
    72  			}
    73  
    74  			// Set Request Body again, since otherwise form values aren't accessible in plugin handler
    75  			r.Body = ioutil.NopCloser(bytes.NewBuffer(bodyBytes))
    76  		}
    77  
    78  		if session != nil && err == nil && csrfCheckPassed {
    79  			r.Header.Set("Mattermost-User-Id", session.UserId)
    80  			context.SessionId = session.Id
    81  		}
    82  	}
    83  
    84  	cookies := r.Cookies()
    85  	r.Header.Del("Cookie")
    86  	for _, c := range cookies {
    87  		if c.Name != model.SESSION_COOKIE_TOKEN {
    88  			r.AddCookie(c)
    89  		}
    90  	}
    91  	r.Header.Del(model.HEADER_AUTH)
    92  	r.Header.Del("Referer")
    93  
    94  	params := mux.Vars(r)
    95  
    96  	subpath, _ := utils.GetSubpathFromConfig(a.Config())
    97  
    98  	newQuery := r.URL.Query()
    99  	newQuery.Del("access_token")
   100  	r.URL.RawQuery = newQuery.Encode()
   101  	r.URL.Path = strings.TrimPrefix(r.URL.Path, path.Join(subpath, "plugins", params["plugin_id"]))
   102  
   103  	handler(context, w, r)
   104  }