mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-28 17:05:39 +00:00
479 lines
14 KiB
Go
479 lines
14 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package model
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import (
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"crypto"
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"crypto/aes"
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"crypto/cipher"
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"crypto/ecdsa"
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"crypto/rand"
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"encoding/asn1"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"math/big"
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"net/http"
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"reflect"
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"strconv"
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"strings"
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)
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const (
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PostActionTypeButton = "button"
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PostActionTypeSelect = "select"
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InteractiveDialogTriggerTimeoutMilliseconds = 3000
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)
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var PostActionRetainPropKeys = []string{"from_webhook", "override_username", "override_icon_url"}
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type DoPostActionRequest struct {
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SelectedOption string `json:"selected_option,omitempty"`
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Cookie string `json:"cookie,omitempty"`
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}
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type PostAction struct {
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// A unique Action ID. If not set, generated automatically.
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Id string `json:"id,omitempty"`
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// The type of the interactive element. Currently supported are
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// "select" and "button".
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Type string `json:"type,omitempty"`
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// The text on the button, or in the select placeholder.
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Name string `json:"name,omitempty"`
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// If the action is disabled.
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Disabled bool `json:"disabled,omitempty"`
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// Style defines a text and border style.
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// Supported values are "default", "primary", "success", "good", "warning", "danger"
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// and any hex color.
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Style string `json:"style,omitempty"`
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// DataSource indicates the data source for the select action. If left
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// empty, the select is populated from Options. Other supported values
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// are "users" and "channels".
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DataSource string `json:"data_source,omitempty"`
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// Options contains the values listed in a select dropdown on the post.
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Options []*PostActionOptions `json:"options,omitempty"`
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// DefaultOption contains the option, if any, that will appear as the
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// default selection in a select box. It has no effect when used with
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// other types of actions.
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DefaultOption string `json:"default_option,omitempty"`
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// Defines the interaction with the backend upon a user action.
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// Integration contains Context, which is private plugin data;
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// Integrations are stripped from Posts when they are sent to the
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// client, or are encrypted in a Cookie.
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Integration *PostActionIntegration `json:"integration,omitempty"`
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Cookie string `json:"cookie,omitempty" db:"-"`
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}
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func (p *PostAction) Equals(input *PostAction) bool {
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if p.Id != input.Id {
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return false
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}
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if p.Type != input.Type {
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return false
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}
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if p.Name != input.Name {
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return false
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}
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if p.DataSource != input.DataSource {
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return false
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}
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if p.DefaultOption != input.DefaultOption {
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return false
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}
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if p.Cookie != input.Cookie {
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return false
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}
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// Compare PostActionOptions
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if len(p.Options) != len(input.Options) {
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return false
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}
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for k := range p.Options {
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if p.Options[k].Text != input.Options[k].Text {
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return false
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}
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if p.Options[k].Value != input.Options[k].Value {
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return false
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}
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}
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// Compare PostActionIntegration
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// If input is nil, then return true if original is also nil.
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// Else return false.
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if input.Integration == nil {
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return p.Integration == nil
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}
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// Both are unequal and not nil.
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if p.Integration.URL != input.Integration.URL {
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return false
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}
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if len(p.Integration.Context) != len(input.Integration.Context) {
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return false
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}
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for key, value := range p.Integration.Context {
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inputValue, ok := input.Integration.Context[key]
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if !ok {
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return false
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}
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switch inputValue.(type) {
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case string, bool, int, float64:
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if value != inputValue {
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return false
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}
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default:
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if !reflect.DeepEqual(value, inputValue) {
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return false
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}
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}
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}
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return true
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}
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// PostActionCookie is set by the server, serialized and encrypted into
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// PostAction.Cookie. The clients should hold on to it, and include it with
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// subsequent DoPostAction requests. This allows the server to access the
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// action metadata even when it's not available in the database, for ephemeral
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// posts.
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type PostActionCookie struct {
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Type string `json:"type,omitempty"`
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PostId string `json:"post_id,omitempty"`
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RootPostId string `json:"root_post_id,omitempty"`
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ChannelId string `json:"channel_id,omitempty"`
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DataSource string `json:"data_source,omitempty"`
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Integration *PostActionIntegration `json:"integration,omitempty"`
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RetainProps map[string]interface{} `json:"retain_props,omitempty"`
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RemoveProps []string `json:"remove_props,omitempty"`
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}
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type PostActionOptions struct {
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Text string `json:"text"`
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Value string `json:"value"`
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}
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type PostActionIntegration struct {
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URL string `json:"url,omitempty"`
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Context map[string]interface{} `json:"context,omitempty"`
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}
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type PostActionIntegrationRequest struct {
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UserId string `json:"user_id"`
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UserName string `json:"user_name"`
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ChannelId string `json:"channel_id"`
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ChannelName string `json:"channel_name"`
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TeamId string `json:"team_id"`
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TeamName string `json:"team_domain"`
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PostId string `json:"post_id"`
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TriggerId string `json:"trigger_id"`
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Type string `json:"type"`
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DataSource string `json:"data_source"`
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Context map[string]interface{} `json:"context,omitempty"`
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}
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type PostActionIntegrationResponse struct {
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Update *Post `json:"update"`
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EphemeralText string `json:"ephemeral_text"`
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SkipSlackParsing bool `json:"skip_slack_parsing"` // Set to `true` to skip the Slack-compatibility handling of Text.
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}
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type PostActionAPIResponse struct {
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Status string `json:"status"` // needed to maintain backwards compatibility
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TriggerId string `json:"trigger_id"`
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}
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type Dialog struct {
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CallbackId string `json:"callback_id"`
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Title string `json:"title"`
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IntroductionText string `json:"introduction_text"`
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IconURL string `json:"icon_url"`
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Elements []DialogElement `json:"elements"`
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SubmitLabel string `json:"submit_label"`
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NotifyOnCancel bool `json:"notify_on_cancel"`
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State string `json:"state"`
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}
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type DialogElement struct {
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DisplayName string `json:"display_name"`
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Name string `json:"name"`
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Type string `json:"type"`
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SubType string `json:"subtype"`
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Default string `json:"default"`
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Placeholder string `json:"placeholder"`
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HelpText string `json:"help_text"`
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Optional bool `json:"optional"`
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MinLength int `json:"min_length"`
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MaxLength int `json:"max_length"`
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DataSource string `json:"data_source"`
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Options []*PostActionOptions `json:"options"`
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}
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type OpenDialogRequest struct {
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TriggerId string `json:"trigger_id"`
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URL string `json:"url"`
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Dialog Dialog `json:"dialog"`
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}
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type SubmitDialogRequest struct {
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Type string `json:"type"`
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URL string `json:"url,omitempty"`
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CallbackId string `json:"callback_id"`
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State string `json:"state"`
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UserId string `json:"user_id"`
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ChannelId string `json:"channel_id"`
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TeamId string `json:"team_id"`
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Submission map[string]interface{} `json:"submission"`
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Cancelled bool `json:"cancelled"`
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}
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type SubmitDialogResponse struct {
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Error string `json:"error,omitempty"`
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Errors map[string]string `json:"errors,omitempty"`
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}
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func GenerateTriggerId(userId string, s crypto.Signer) (string, string, *AppError) {
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clientTriggerId := NewId()
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triggerData := strings.Join([]string{clientTriggerId, userId, strconv.FormatInt(GetMillis(), 10)}, ":") + ":"
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h := crypto.SHA256
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sum := h.New()
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sum.Write([]byte(triggerData))
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signature, err := s.Sign(rand.Reader, sum.Sum(nil), h)
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if err != nil {
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return "", "", NewAppError("GenerateTriggerId", "interactive_message.generate_trigger_id.signing_failed", nil, err.Error(), http.StatusInternalServerError)
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}
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base64Sig := base64.StdEncoding.EncodeToString(signature)
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triggerId := base64.StdEncoding.EncodeToString([]byte(triggerData + base64Sig))
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return clientTriggerId, triggerId, nil
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}
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func (r *PostActionIntegrationRequest) GenerateTriggerId(s crypto.Signer) (string, string, *AppError) {
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clientTriggerId, triggerId, err := GenerateTriggerId(r.UserId, s)
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if err != nil {
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return "", "", err
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}
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r.TriggerId = triggerId
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return clientTriggerId, triggerId, nil
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}
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func DecodeAndVerifyTriggerId(triggerId string, s *ecdsa.PrivateKey) (string, string, *AppError) {
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triggerIdBytes, err := base64.StdEncoding.DecodeString(triggerId)
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if err != nil {
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return "", "", NewAppError("DecodeAndVerifyTriggerId", "interactive_message.decode_trigger_id.base64_decode_failed", nil, err.Error(), http.StatusBadRequest)
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}
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split := strings.Split(string(triggerIdBytes), ":")
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if len(split) != 4 {
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return "", "", NewAppError("DecodeAndVerifyTriggerId", "interactive_message.decode_trigger_id.missing_data", nil, "", http.StatusBadRequest)
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}
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clientTriggerId := split[0]
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userId := split[1]
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timestampStr := split[2]
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timestamp, _ := strconv.ParseInt(timestampStr, 10, 64)
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now := GetMillis()
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if now-timestamp > InteractiveDialogTriggerTimeoutMilliseconds {
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return "", "", NewAppError("DecodeAndVerifyTriggerId", "interactive_message.decode_trigger_id.expired", map[string]interface{}{"Seconds": InteractiveDialogTriggerTimeoutMilliseconds / 1000}, "", http.StatusBadRequest)
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}
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signature, err := base64.StdEncoding.DecodeString(split[3])
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if err != nil {
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return "", "", NewAppError("DecodeAndVerifyTriggerId", "interactive_message.decode_trigger_id.base64_decode_failed_signature", nil, err.Error(), http.StatusBadRequest)
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}
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var esig struct {
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R, S *big.Int
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}
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if _, err := asn1.Unmarshal(signature, &esig); err != nil {
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return "", "", NewAppError("DecodeAndVerifyTriggerId", "interactive_message.decode_trigger_id.signature_decode_failed", nil, err.Error(), http.StatusBadRequest)
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}
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triggerData := strings.Join([]string{clientTriggerId, userId, timestampStr}, ":") + ":"
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h := crypto.SHA256
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sum := h.New()
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sum.Write([]byte(triggerData))
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if !ecdsa.Verify(&s.PublicKey, sum.Sum(nil), esig.R, esig.S) {
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return "", "", NewAppError("DecodeAndVerifyTriggerId", "interactive_message.decode_trigger_id.verify_signature_failed", nil, "", http.StatusBadRequest)
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}
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return clientTriggerId, userId, nil
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}
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func (r *OpenDialogRequest) DecodeAndVerifyTriggerId(s *ecdsa.PrivateKey) (string, string, *AppError) {
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return DecodeAndVerifyTriggerId(r.TriggerId, s)
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}
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func (o *Post) StripActionIntegrations() {
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attachments := o.Attachments()
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if o.GetProp("attachments") != nil {
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o.AddProp("attachments", attachments)
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}
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for _, attachment := range attachments {
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for _, action := range attachment.Actions {
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action.Integration = nil
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}
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}
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}
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func (o *Post) GetAction(id string) *PostAction {
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for _, attachment := range o.Attachments() {
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for _, action := range attachment.Actions {
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if action != nil && action.Id == id {
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return action
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}
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}
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}
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return nil
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}
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func (o *Post) GenerateActionIds() {
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if o.GetProp("attachments") != nil {
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o.AddProp("attachments", o.Attachments())
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}
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if attachments, ok := o.GetProp("attachments").([]*SlackAttachment); ok {
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for _, attachment := range attachments {
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for _, action := range attachment.Actions {
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if action != nil && action.Id == "" {
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action.Id = NewId()
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}
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}
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}
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}
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}
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func AddPostActionCookies(o *Post, secret []byte) *Post {
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p := o.Clone()
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// retainedProps carry over their value from the old post, including no value
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retainProps := map[string]interface{}{}
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removeProps := []string{}
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for _, key := range PostActionRetainPropKeys {
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value, ok := p.GetProps()[key]
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if ok {
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retainProps[key] = value
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} else {
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removeProps = append(removeProps, key)
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}
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}
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attachments := p.Attachments()
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for _, attachment := range attachments {
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for _, action := range attachment.Actions {
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c := &PostActionCookie{
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Type: action.Type,
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ChannelId: p.ChannelId,
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DataSource: action.DataSource,
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Integration: action.Integration,
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RetainProps: retainProps,
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RemoveProps: removeProps,
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}
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c.PostId = p.Id
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if p.RootId == "" {
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c.RootPostId = p.Id
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} else {
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c.RootPostId = p.RootId
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}
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b, _ := json.Marshal(c)
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action.Cookie, _ = encryptPostActionCookie(string(b), secret)
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}
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}
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return p
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}
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func encryptPostActionCookie(plain string, secret []byte) (string, error) {
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if len(secret) == 0 {
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return plain, nil
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}
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block, err := aes.NewCipher(secret)
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if err != nil {
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return "", err
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}
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, aesgcm.NonceSize())
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_, err = io.ReadFull(rand.Reader, nonce)
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if err != nil {
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return "", err
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}
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sealed := aesgcm.Seal(nil, nonce, []byte(plain), nil)
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combined := append(nonce, sealed...)
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encoded := make([]byte, base64.StdEncoding.EncodedLen(len(combined)))
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base64.StdEncoding.Encode(encoded, combined)
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return string(encoded), nil
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}
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func DecryptPostActionCookie(encoded string, secret []byte) (string, error) {
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if len(secret) == 0 {
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return encoded, nil
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}
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block, err := aes.NewCipher(secret)
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if err != nil {
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return "", err
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}
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aesgcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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decoded := make([]byte, base64.StdEncoding.DecodedLen(len(encoded)))
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n, err := base64.StdEncoding.Decode(decoded, []byte(encoded))
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if err != nil {
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return "", err
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}
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decoded = decoded[:n]
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nonceSize := aesgcm.NonceSize()
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if len(decoded) < nonceSize {
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return "", fmt.Errorf("cookie too short")
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}
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nonce, decoded := decoded[:nonceSize], decoded[nonceSize:]
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plain, err := aesgcm.Open(nil, nonce, decoded, nil)
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if err != nil {
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return "", err
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}
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return string(plain), nil
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}
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