Move permissions code into app package (#5146)

* Move permissions code into app package

* Revert getPosts permission

app/authorization.go

@@ -0,0 +1,166 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/model"
+)
+
+func SessionHasPermissionTo(session model.Session, permission *model.Permission) bool {
+	return CheckIfRolesGrantPermission(session.GetUserRoles(), permission.Id)
+}
+
+func SessionHasPermissionToTeam(session model.Session, teamId string, permission *model.Permission) bool {
+	if teamId == "" {
+		return false
+	}
+
+	teamMember := session.GetTeamByTeamId(teamId)
+	if teamMember != nil {
+		if CheckIfRolesGrantPermission(teamMember.GetRoles(), permission.Id) {
+			return true
+		}
+	}
+
+	return SessionHasPermissionTo(session, permission)
+}
+
+func SessionHasPermissionToChannel(session model.Session, channelId string, permission *model.Permission) bool {
+	if channelId == "" {
+		return false
+	}
+
+	channelMember, err := GetChannelMember(channelId, session.UserId)
+	if err == nil {
+		roles := channelMember.GetRoles()
+		if CheckIfRolesGrantPermission(roles, permission.Id) {
+			return true
+		}
+	}
+
+	var channel *model.Channel
+	channel, err = GetChannel(channelId)
+	if err == nil {
+		return SessionHasPermissionToTeam(session, channel.TeamId, permission)
+	}
+
+	return SessionHasPermissionTo(session, permission)
+}
+
+func SessionHasPermissionToChannelByPost(session model.Session, postId string, permission *model.Permission) bool {
+	var channelMember *model.ChannelMember
+	if result := <-Srv.Store.Channel().GetMemberForPost(postId, session.UserId); result.Err == nil {
+		channelMember = result.Data.(*model.ChannelMember)
+
+		if CheckIfRolesGrantPermission(channelMember.GetRoles(), permission.Id) {
+			return true
+		}
+	}
+
+	if result := <-Srv.Store.Channel().GetForPost(postId); result.Err == nil {
+		channel := result.Data.(*model.Channel)
+		return SessionHasPermissionToTeam(session, channel.TeamId, permission)
+	}
+
+	return SessionHasPermissionTo(session, permission)
+}
+
+func SessionHasPermissionToUser(session model.Session, userId string) bool {
+	if userId == "" {
+		return false
+	}
+
+	if session.UserId == userId {
+		return true
+	}
+
+	if SessionHasPermissionTo(session, model.PERMISSION_EDIT_OTHER_USERS) {
+		return true
+	}
+
+	return false
+}
+
+func HasPermissionTo(askingUserId string, permission *model.Permission) bool {
+	user, err := GetUser(askingUserId)
+	if err != nil {
+		return false
+	}
+
+	roles := user.GetRoles()
+
+	return CheckIfRolesGrantPermission(roles, permission.Id)
+}
+
+func HasPermissionToTeam(askingUserId string, teamId string, permission *model.Permission) bool {
+	if teamId == "" || askingUserId == "" {
+		return false
+	}
+
+	teamMember, err := GetTeamMember(teamId, askingUserId)
+	if err != nil {
+		return false
+	}
+
+	roles := teamMember.GetRoles()
+
+	if CheckIfRolesGrantPermission(roles, permission.Id) {
+		return true
+	}
+
+	return HasPermissionTo(askingUserId, permission)
+}
+
+func HasPermissionToChannel(askingUserId string, channelId string, permission *model.Permission) bool {
+	if channelId == "" || askingUserId == "" {
+		return false
+	}
+
+	channelMember, err := GetChannelMember(channelId, askingUserId)
+	if err == nil {
+		roles := channelMember.GetRoles()
+		if CheckIfRolesGrantPermission(roles, permission.Id) {
+			return true
+		}
+	}
+
+	var channel *model.Channel
+	channel, err = GetChannel(channelId)
+	if err == nil {
+		return HasPermissionToTeam(askingUserId, channel.TeamId, permission)
+	}
+
+	return HasPermissionTo(askingUserId, permission)
+}
+
+func HasPermissionToUser(askingUserId string, userId string) bool {
+	if askingUserId == userId {
+		return true
+	}
+
+	if HasPermissionTo(askingUserId, model.PERMISSION_EDIT_OTHER_USERS) {
+		return true
+	}
+
+	return false
+}
+
+func CheckIfRolesGrantPermission(roles []string, permissionId string) bool {
+	for _, roleId := range roles {
+		if role, ok := model.BuiltInRoles[roleId]; !ok {
+			l4g.Debug("Bad role in system " + roleId)
+			return false
+		} else {
+			permissions := role.Permissions
+			for _, permission := range permissions {
+				if permission == permissionId {
+					return true
+				}
+			}
+		}
+	}
+
+	return false
+}