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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api
import (
"fmt"
"net"
"net/http"
"net/url"
"strings"
l4g "github.com/alecthomas/log4go"
"github.com/gorilla/mux"
goi18n "github.com/nicksnyder/go-i18n/i18n"
"github.com/mattermost/platform/einterfaces"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/store"
"github.com/mattermost/platform/utils"
)
var sessionCache *utils.Cache = utils.NewLru(model.SESSION_CACHE_SIZE)
var allowedMethods []string = []string{
"POST",
"GET",
"OPTIONS",
"PUT",
"PATCH",
"DELETE",
}
type Context struct {
Session model.Session
RequestId string
IpAddress string
Path string
Err *model.AppError
teamURLValid bool
teamURL string
siteURL string
T goi18n.TranslateFunc
Locale string
TeamId string
}
func ApiAppHandler(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, false, false, true, false, false, false}
}
func AppHandler(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, false, false, false, false, false, false}
}
func AppHandlerIndependent(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, false, false, false, false, true, false}
}
func ApiUserRequired(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, true, false, true, true, false, false}
}
func ApiUserRequiredActivity(h func(*Context, http.ResponseWriter, *http.Request), isUserActivity bool) http.Handler {
return &handler{h, true, false, true, isUserActivity, false, false}
}
func UserRequired(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, true, false, false, false, false, false}
}
func AppHandlerTrustRequester(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, false, false, false, false, false, true}
}
func ApiAdminSystemRequired(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, true, true, true, false, false, false}
}
func ApiAppHandlerTrustRequester(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, false, false, true, false, false, true}
}
func ApiUserRequiredTrustRequester(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, true, false, true, true, false, true}
}
func ApiAppHandlerTrustRequesterIndependent(h func(*Context, http.ResponseWriter, *http.Request)) http.Handler {
return &handler{h, false, false, true, false, true, true}
}
type handler struct {
handleFunc func(*Context, http.ResponseWriter, *http.Request)
requireUser bool
requireSystemAdmin bool
isApi bool
isUserActivity bool
isTeamIndependent bool
trustRequester bool
}
func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
l4g.Debug("%v", r.URL.Path)
c := &Context{}
c.T, c.Locale = utils.GetTranslationsAndLocale(w, r)
c.RequestId = model.NewId()
c.IpAddress = GetIpAddress(r)
c.TeamId = mux.Vars(r)["team_id"]
token := ""
isTokenFromQueryString := false
// Attempt to parse token out of the header
authHeader := r.Header.Get(model.HEADER_AUTH)
if len(authHeader) > 6 && strings.ToUpper(authHeader[0:6]) == model.HEADER_BEARER {
// Default session token
token = authHeader[7:]
} else if len(authHeader) > 5 && strings.ToLower(authHeader[0:5]) == model.HEADER_TOKEN {
// OAuth token
token = authHeader[6:]
}
// Attempt to parse the token from the cookie
if len(token) == 0 {
if cookie, err := r.Cookie(model.SESSION_COOKIE_TOKEN); err == nil {
token = cookie.Value
if (h.requireSystemAdmin || h.requireUser) && !h.trustRequester {
if r.Header.Get(model.HEADER_REQUESTED_WITH) != model.HEADER_REQUESTED_WITH_XML {
c.Err = model.NewLocAppError("ServeHTTP", "api.context.session_expired.app_error", nil, "token="+token+" Appears to bea CSRF attempt")
token = ""
}
}
}
}
// Attempt to parse token out of the query string
if len(token) == 0 {
token = r.URL.Query().Get("access_token")
isTokenFromQueryString = true
}
if *utils.Cfg.ServiceSettings.SiteURL != "" {
c.SetSiteURL(*utils.Cfg.ServiceSettings.SiteURL)
} else {
protocol := GetProtocol(r)
c.SetSiteURL(protocol + "://" + r.Host)
}
w.Header().Set(model.HEADER_REQUEST_ID, c.RequestId)
w.Header().Set(model.HEADER_VERSION_ID, fmt.Sprintf("%v.%v", model.CurrentVersion, utils.CfgHash))
if einterfaces.GetClusterInterface() != nil {
w.Header().Set(model.HEADER_CLUSTER_ID, einterfaces.GetClusterInterface().GetClusterId())
}
// Instruct the browser not to display us in an iframe unless is the same origin for anti-clickjacking
if !h.isApi {
w.Header().Set("X-Frame-Options", "SAMEORIGIN")
w.Header().Set("Content-Security-Policy", "frame-ancestors 'self'")
} else {
// All api response bodies will be JSON formatted by default
w.Header().Set("Content-Type", "application/json")
if r.Method == "GET" {
w.Header().Set("Expires", "0")
}
}
if len(token) != 0 {
session := GetSession(token)
if session == nil || session.IsExpired() {
c.RemoveSessionCookie(w, r)
if h.requireUser || h.requireSystemAdmin {
c.Err = model.NewLocAppError("ServeHTTP", "api.context.session_expired.app_error", nil, "token="+token)
c.Err.StatusCode = http.StatusUnauthorized
}
} else if !session.IsOAuth && isTokenFromQueryString {
c.Err = model.NewLocAppError("ServeHTTP", "api.context.token_provided.app_error", nil, "token="+token)
c.Err.StatusCode = http.StatusUnauthorized
} else {
c.Session = *session
}
}
if h.isApi || h.isTeamIndependent {
c.setTeamURL(c.GetSiteURL(), false)
c.Path = r.URL.Path
} else {
splitURL := strings.Split(r.URL.Path, "/")
c.setTeamURL(c.GetSiteURL()+"/"+splitURL[1], true)
c.Path = "/" + strings.Join(splitURL[2:], "/")
}
if c.Err == nil && h.requireUser {
c.UserRequired()
}
if c.Err == nil && h.requireSystemAdmin {
c.SystemAdminRequired()
}
if c.Err == nil && len(c.TeamId) > 0 && !h.isTeamIndependent {
c.HasPermissionsToTeam(c.TeamId, "TeamRoute")
}
if c.Err == nil && h.isUserActivity && token != "" && len(c.Session.UserId) > 0 {
SetStatusOnline(c.Session.UserId, c.Session.Id, false)
}
if c.Err == nil {
h.handleFunc(c, w, r)
}
// Handle errors that have occoured
if c.Err != nil {
c.Err.Translate(c.T)
c.Err.RequestId = c.RequestId
c.LogError(c.Err)
c.Err.Where = r.URL.Path
// Block out detailed error whenn not in developer mode
if !*utils.Cfg.ServiceSettings.EnableDeveloper {
c.Err.DetailedError = ""
}
if h.isApi {
w.WriteHeader(c.Err.StatusCode)
w.Write([]byte(c.Err.ToJson()))
} else {
if c.Err.StatusCode == http.StatusUnauthorized {
http.Redirect(w, r, c.GetTeamURL()+"/?redirect="+url.QueryEscape(r.URL.Path), http.StatusTemporaryRedirect)
} else {
RenderWebError(c.Err, w, r)
}
}
}
}
func (cw *CorsWrapper) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if len(*utils.Cfg.ServiceSettings.AllowCorsFrom) > 0 {
origin := r.Header.Get("Origin")
if *utils.Cfg.ServiceSettings.AllowCorsFrom == "*" || strings.Contains(*utils.Cfg.ServiceSettings.AllowCorsFrom, origin) {
w.Header().Set("Access-Control-Allow-Origin", origin)
if r.Method == "OPTIONS" {
w.Header().Set(
"Access-Control-Allow-Methods",
strings.Join(allowedMethods, ", "))
w.Header().Set(
"Access-Control-Allow-Headers",
r.Header.Get("Access-Control-Request-Headers"))
}
}
}
if r.Method == "OPTIONS" {
return
}
cw.router.ServeHTTP(w, r)
}
func GetProtocol(r *http.Request) string {
if r.Header.Get(model.HEADER_FORWARDED_PROTO) == "https" {
return "https"
} else {
return "http"
}
}
func (c *Context) LogAudit(extraInfo string) {
audit := &model.Audit{UserId: c.Session.UserId, IpAddress: c.IpAddress, Action: c.Path, ExtraInfo: extraInfo, SessionId: c.Session.Id}
if r := <-Srv.Store.Audit().Save(audit); r.Err != nil {
c.LogError(r.Err)
}
}
func (c *Context) LogAuditWithUserId(userId, extraInfo string) {
if len(c.Session.UserId) > 0 {
extraInfo = strings.TrimSpace(extraInfo + " session_user=" + c.Session.UserId)
}
audit := &model.Audit{UserId: userId, IpAddress: c.IpAddress, Action: c.Path, ExtraInfo: extraInfo, SessionId: c.Session.Id}
if r := <-Srv.Store.Audit().Save(audit); r.Err != nil {
c.LogError(r.Err)
}
}
func (c *Context) LogError(err *model.AppError) {
// filter out endless reconnects
if c.Path == "/api/v3/users/websocket" && err.StatusCode == 401 || err.Id == "web.check_browser_compatibility.app_error" {
c.LogDebug(err)
} else {
l4g.Error(utils.T("api.context.log.error"), c.Path, err.Where, err.StatusCode,
c.RequestId, c.Session.UserId, c.IpAddress, err.SystemMessage(utils.T), err.DetailedError)
}
}
func (c *Context) LogDebug(err *model.AppError) {
l4g.Debug(utils.T("api.context.log.error"), c.Path, err.Where, err.StatusCode,
c.RequestId, c.Session.UserId, c.IpAddress, err.SystemMessage(utils.T), err.DetailedError)
}
func (c *Context) UserRequired() {
if len(c.Session.UserId) == 0 {
c.Err = model.NewLocAppError("", "api.context.session_expired.app_error", nil, "UserRequired")
c.Err.StatusCode = http.StatusUnauthorized
return
}
}
func (c *Context) SystemAdminRequired() {
if len(c.Session.UserId) == 0 {
c.Err = model.NewLocAppError("", "api.context.session_expired.app_error", nil, "SystemAdminRequired")
c.Err.StatusCode = http.StatusUnauthorized
return
} else if !c.IsSystemAdmin() {
c.Err = model.NewLocAppError("", "api.context.permissions.app_error", nil, "AdminRequired")
c.Err.StatusCode = http.StatusForbidden
return
}
}
func (c *Context) HasPermissionsToUser(userId string, where string) bool {
// You are the user
if c.Session.UserId == userId {
return true
}
// You're a mattermost system admin and you're on the VPN
if c.IsSystemAdmin() {
return true
}
c.Err = model.NewLocAppError(where, "api.context.permissions.app_error", nil, "userId="+userId)
c.Err.StatusCode = http.StatusForbidden
return false
}
func (c *Context) HasPermissionsToTeam(teamId string, where string) bool {
if c.IsSystemAdmin() {
return true
}
for _, teamMember := range c.Session.TeamMembers {
if teamId == teamMember.TeamId {
return true
}
}
c.Err = model.NewLocAppError(where, "api.context.permissions.app_error", nil, "userId="+c.Session.UserId+", teamId="+teamId)
c.Err.StatusCode = http.StatusForbidden
return false
}
func (c *Context) HasPermissionsToChannel(sc store.StoreChannel, where string) bool {
if cresult := <-sc; cresult.Err != nil {
c.Err = cresult.Err
return false
} else if cresult.Data.(int64) != 1 {
c.Err = model.NewLocAppError(where, "api.context.permissions.app_error", nil, "userId="+c.Session.UserId)
c.Err.StatusCode = http.StatusForbidden
return false
}
return true
}
func (c *Context) HasSystemAdminPermissions(where string) bool {
if c.IsSystemAdmin() {
return true
}
c.Err = model.NewLocAppError(where, "api.context.system_permissions.app_error", nil, "userId="+c.Session.UserId)
c.Err.StatusCode = http.StatusForbidden
return false
}
func (c *Context) IsSystemAdmin() bool {
if model.IsInRole(c.Session.Roles, model.ROLE_SYSTEM_ADMIN) {
return true
}
return false
}
func (c *Context) IsTeamAdmin() bool {
if c.IsSystemAdmin() {
return true
}
teamMember := c.Session.GetTeamByTeamId(c.TeamId)
if teamMember == nil {
return false
}
return teamMember.IsTeamAdmin()
}
func (c *Context) RemoveSessionCookie(w http.ResponseWriter, r *http.Request) {
cookie := &http.Cookie{
Name: model.SESSION_COOKIE_TOKEN,
Value: "",
Path: "/",
MaxAge: -1,
HttpOnly: true,
}
http.SetCookie(w, cookie)
}
func (c *Context) SetInvalidParam(where string, name string) {
c.Err = NewInvalidParamError(where, name)
}
func NewInvalidParamError(where string, name string) *model.AppError {
err := model.NewLocAppError(where, "api.context.invalid_param.app_error", map[string]interface{}{"Name": name}, "")
err.StatusCode = http.StatusBadRequest
return err
}
func (c *Context) SetUnknownError(where string, details string) {
c.Err = model.NewLocAppError(where, "api.context.unknown.app_error", nil, details)
}
func (c *Context) setTeamURL(url string, valid bool) {
c.teamURL = url
c.teamURLValid = valid
}
func (c *Context) SetTeamURLFromSession() {
if result := <-Srv.Store.Team().Get(c.TeamId); result.Err == nil {
c.setTeamURL(c.GetSiteURL()+"/"+result.Data.(*model.Team).Name, true)
}
}
func (c *Context) SetSiteURL(url string) {
c.siteURL = url
}
func (c *Context) GetTeamURLFromTeam(team *model.Team) string {
return c.GetSiteURL() + "/" + team.Name
}
func (c *Context) GetTeamURL() string {
if !c.teamURLValid {
c.SetTeamURLFromSession()
if !c.teamURLValid {
l4g.Debug(utils.T("api.context.invalid_team_url.debug"))
}
}
return c.teamURL
}
func (c *Context) GetSiteURL() string {
return c.siteURL
}
func IsApiCall(r *http.Request) bool {
return strings.Index(r.URL.Path, "/api/") == 0
}
func GetIpAddress(r *http.Request) string {
address := r.Header.Get(model.HEADER_FORWARDED)
if len(address) == 0 {
address = r.Header.Get(model.HEADER_REAL_IP)
}
if len(address) == 0 {
address, _, _ = net.SplitHostPort(r.RemoteAddr)
}
return address
}
func RenderWebError(err *model.AppError, w http.ResponseWriter, r *http.Request) {
T, _ := utils.GetTranslationsAndLocale(w, r)
title := T("api.templates.error.title", map[string]interface{}{"SiteName": utils.ClientCfg["SiteName"]})
message := err.Message
details := err.DetailedError
link := "/"
linkMessage := T("api.templates.error.link")
status := http.StatusTemporaryRedirect
if err.StatusCode != http.StatusInternalServerError {
status = err.StatusCode
}
http.Redirect(
w,
r,
"/error?title="+url.QueryEscape(title)+
"&message="+url.QueryEscape(message)+
"&details="+url.QueryEscape(details)+
"&link="+url.QueryEscape(link)+
"&linkmessage="+url.QueryEscape(linkMessage),
status)
}
func Handle404(w http.ResponseWriter, r *http.Request) {
err := model.NewLocAppError("Handle404", "api.context.404.app_error", nil, "")
err.Translate(utils.T)
err.StatusCode = http.StatusNotFound
l4g.Debug("%v: code=404 ip=%v", r.URL.Path, GetIpAddress(r))
if IsApiCall(r) {
w.WriteHeader(err.StatusCode)
err.DetailedError = "There doesn't appear to be an api call for the url='" + r.URL.Path + "'. Typo? are you missing a team_id or user_id as part of the url?"
w.Write([]byte(err.ToJson()))
} else {
RenderWebError(err, w, r)
}
}
func GetSession(token string) *model.Session {
var session *model.Session
if ts, ok := sessionCache.Get(token); ok {
session = ts.(*model.Session)
}
if session == nil {
if sessionResult := <-Srv.Store.Session().Get(token); sessionResult.Err != nil {
l4g.Error(utils.T("api.context.invalid_token.error"), token, sessionResult.Err.DetailedError)
} else {
session = sessionResult.Data.(*model.Session)
if session.IsExpired() || session.Token != token {
return nil
} else {
AddSessionToCache(session)
return session
}
}
}
return session
}
func RemoveAllSessionsForUserId(userId string) {
keys := sessionCache.Keys()
for _, key := range keys {
if ts, ok := sessionCache.Get(key); ok {
session := ts.(*model.Session)
if session.UserId == userId {
sessionCache.Remove(key)
}
}
}
if einterfaces.GetClusterInterface() != nil {
einterfaces.GetClusterInterface().RemoveAllSessionsForUserId(userId)
}
}
func AddSessionToCache(session *model.Session) {
sessionCache.AddWithExpiresInSecs(session.Token, session, int64(*utils.Cfg.ServiceSettings.SessionCacheInMinutes*60))
}
|