Add vendor matterbridge/gozulipbot

5 files changed, 762 insertions, 0 deletions

diff --git a/vendor/github.com/matterbridge/gozulipbot/bot.go b/vendor/github.com/matterbridge/gozulipbot/bot.go
new file mode 100644
index 00000000..24bc8768
--- /dev/null
+++ b/vendor/github.com/matterbridge/gozulipbot/bot.go
@@ -0,0 +1,256 @@
+package gozulipbot
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"time"
+)
+
+type Bot struct {
+	APIKey  string
+	APIURL  string
+	Email   string
+	Queues  []*Queue
+	Streams []string
+	Client  Doer
+	Backoff time.Duration
+	Retries int64
+}
+
+type Doer interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+// Init adds an http client to an existing bot struct.
+func (b *Bot) Init() *Bot {
+	b.Client = &http.Client{}
+	return b
+}
+
+// GetStreamList gets the raw http response when requesting all public streams.
+func (b *Bot) GetStreamList() (*http.Response, error) {
+	req, err := b.constructRequest("GET", "streams", "")
+	if err != nil {
+		return nil, err
+	}
+
+	return b.Client.Do(req)
+}
+
+type StreamJSON struct {
+	Msg     string `json:"msg"`
+	Streams []struct {
+		StreamID    int    `json:"stream_id"`
+		InviteOnly  bool   `json:"invite_only"`
+		Description string `json:"description"`
+		Name        string `json:"name"`
+	} `json:"streams"`
+	Result string `json:"result"`
+}
+
+// GetStreams returns a list of all public streams
+func (b *Bot) GetStreams() ([]string, error) {
+	resp, err := b.GetStreamList()
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var sj StreamJSON
+	err = json.Unmarshal(body, &sj)
+	if err != nil {
+		return nil, err
+	}
+
+	var streams []string
+	for _, s := range sj.Streams {
+		streams = append(streams, s.Name)
+	}
+
+	return streams, nil
+}
+
+// GetStreams returns a list of all public streams
+func (b *Bot) GetRawStreams() (StreamJSON, error) {
+	var sj StreamJSON
+	resp, err := b.GetStreamList()
+	if err != nil {
+		return sj, err
+	}
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return sj, err
+	}
+
+	err = json.Unmarshal(body, &sj)
+	if err != nil {
+		return sj, err
+	}
+	return sj, nil
+}
+
+// Subscribe will set the bot to receive messages from the given streams.
+// If no streams are given, it will subscribe the bot to the streams in the bot struct.
+func (b *Bot) Subscribe(streams []string) (*http.Response, error) {
+	if streams == nil {
+		streams = b.Streams
+	}
+
+	var toSubStreams []map[string]string
+	for _, name := range streams {
+		toSubStreams = append(toSubStreams, map[string]string{"name": name})
+	}
+
+	bodyBts, err := json.Marshal(toSubStreams)
+	if err != nil {
+		return nil, err
+	}
+
+	body := "subscriptions=" + string(bodyBts)
+
+	req, err := b.constructRequest("POST", "users/me/subscriptions", body)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.Client.Do(req)
+}
+
+// Unsubscribe will remove the bot from the given streams.
+// If no streams are given, nothing will happen and the function will error.
+func (b *Bot) Unsubscribe(streams []string) (*http.Response, error) {
+	if len(streams) == 0 {
+		return nil, fmt.Errorf("No streams were provided")
+	}
+
+	body := `delete=["` + strings.Join(streams, `","`) + `"]`
+
+	req, err := b.constructRequest("PATCH", "users/me/subscriptions", body)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.Client.Do(req)
+}
+
+func (b *Bot) ListSubscriptions() (*http.Response, error) {
+	req, err := b.constructRequest("GET", "users/me/subscriptions", "")
+	if err != nil {
+		return nil, err
+	}
+
+	return b.Client.Do(req)
+}
+
+type EventType string
+
+const (
+	Messages      EventType = "messages"
+	Subscriptions EventType = "subscriptions"
+	RealmUser     EventType = "realm_user"
+	Pointer       EventType = "pointer"
+)
+
+type Narrow string
+
+const (
+	NarrowPrivate Narrow = `[["is", "private"]]`
+	NarrowAt      Narrow = `[["is", "mentioned"]]`
+)
+
+// RegisterEvents adds a queue to the bot. It includes the EventTypes and
+// Narrow given. If neither is given, it will default to all Messages.
+func (b *Bot) RegisterEvents(ets []EventType, n Narrow) (*Queue, error) {
+	resp, err := b.RawRegisterEvents(ets, n)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	q := &Queue{Bot: b}
+	err = json.Unmarshal(body, q)
+	if err != nil {
+		return nil, err
+	}
+
+	if q.LastEventID < q.MaxMessageID {
+		q.LastEventID = q.MaxMessageID
+	}
+
+	b.Queues = append(b.Queues, q)
+
+	return q, nil
+}
+
+func (b *Bot) RegisterAll() (*Queue, error) {
+	return b.RegisterEvents(nil, "")
+}
+
+func (b *Bot) RegisterAt() (*Queue, error) {
+	return b.RegisterEvents(nil, NarrowAt)
+}
+
+func (b *Bot) RegisterPrivate() (*Queue, error) {
+	return b.RegisterEvents(nil, NarrowPrivate)
+}
+
+func (b *Bot) RegisterSubscriptions() (*Queue, error) {
+	events := []EventType{Subscriptions}
+	return b.RegisterEvents(events, "")
+}
+
+// RawRegisterEvents tells Zulip to include message events in the bots events queue.
+// Passing nil as the slice of EventType will default to receiving Messages
+func (b *Bot) RawRegisterEvents(ets []EventType, n Narrow) (*http.Response, error) {
+	// default to Messages if no EventTypes given
+	query := `event_types=["message"]`
+
+	if len(ets) != 0 {
+		query = `event_types=["`
+		for i, s := range ets {
+			query += fmt.Sprintf("%s", s)
+			if i != len(ets)-1 {
+				query += `", "`
+			}
+		}
+		query += `"]`
+	}
+
+	if n != "" {
+		query += fmt.Sprintf("&narrow=%s", n)
+	}
+	query += fmt.Sprintf("&all_public_streams=true")
+	req, err := b.constructRequest("POST", "register", query)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.Client.Do(req)
+}
+
+// constructRequest makes a zulip request and ensures the proper headers are set.
+func (b *Bot) constructRequest(method, endpoint, body string) (*http.Request, error) {
+	url := b.APIURL + endpoint
+	req, err := http.NewRequest(method, url, strings.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.SetBasicAuth(b.Email, b.APIKey)
+
+	return req, nil
+}
diff --git a/vendor/github.com/matterbridge/gozulipbot/flag.go b/vendor/github.com/matterbridge/gozulipbot/flag.go
new file mode 100644
index 00000000..6305aac1
--- /dev/null
+++ b/vendor/github.com/matterbridge/gozulipbot/flag.go
@@ -0,0 +1,32 @@
+package gozulipbot
+
+import (
+	"flag"
+	"fmt"
+	"time"
+)
+
+func (b *Bot) GetConfigFromFlags() error {
+	var (
+		apiKey  = flag.String("apikey", "", "bot api key")
+		apiURL  = flag.String("apiurl", "", "url of zulip server")
+		email   = flag.String("email", "", "bot email address")
+		backoff = flag.Duration("backoff", 1*time.Second, "backoff base duration")
+	)
+	flag.Parse()
+
+	if *apiKey == "" {
+		return fmt.Errorf("--apikey is required")
+	}
+	if *apiURL == "" {
+		return fmt.Errorf("--apiurl is required")
+	}
+	if *email == "" {
+		return fmt.Errorf("--email is required")
+	}
+	b.APIKey = *apiKey
+	b.APIURL = *apiURL
+	b.Email = *email
+	b.Backoff = *backoff
+	return nil
+}
diff --git a/vendor/github.com/matterbridge/gozulipbot/message.go b/vendor/github.com/matterbridge/gozulipbot/message.go
new file mode 100644
index 00000000..df963f43
--- /dev/null
+++ b/vendor/github.com/matterbridge/gozulipbot/message.go
@@ -0,0 +1,263 @@
+package gozulipbot
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+)
+
+// A Message is all of the necessary metadata to post on Zulip.
+// It can be either a public message, where Topic is set, or a private message,
+// where there is at least one element in Emails.
+//
+// If the length of Emails is not 0, functions will always assume it is a private message.
+type Message struct {
+	Stream  string
+	Topic   string
+	Emails  []string
+	Content string
+}
+
+type EventMessage struct {
+	AvatarURL        string           `json:"avatar_url"`
+	Client           string           `json:"client"`
+	Content          string           `json:"content"`
+	ContentType      string           `json:"content_type"`
+	DisplayRecipient DisplayRecipient `json:"display_recipient"`
+	GravatarHash     string           `json:"gravatar_hash"`
+	ID               int              `json:"id"`
+	RecipientID      int              `json:"recipient_id"`
+	SenderDomain     string           `json:"sender_domain"`
+	SenderEmail      string           `json:"sender_email"`
+	SenderFullName   string           `json:"sender_full_name"`
+	SenderID         int              `json:"sender_id"`
+	SenderShortName  string           `json:"sender_short_name"`
+	Subject          string           `json:"subject"`
+	SubjectLinks     []interface{}    `json:"subject_links"`
+	StreamID         int              `json:"stream_id"`
+	Timestamp        int              `json:"timestamp"`
+	Type             string           `json:"type"`
+	Queue            *Queue           `json:"-"`
+}
+
+type DisplayRecipient struct {
+	Users []User `json:"users,omitempty"`
+	Topic string `json:"topic,omitempty"`
+}
+
+type User struct {
+	Domain        string `json:"domain"`
+	Email         string `json:"email"`
+	FullName      string `json:"full_name"`
+	ID            int    `json:"id"`
+	IsMirrorDummy bool   `json:"is_mirror_dummy"`
+	ShortName     string `json:"short_name"`
+}
+
+func (d *DisplayRecipient) UnmarshalJSON(b []byte) (err error) {
+	topic, users := "", make([]User, 1)
+	if err = json.Unmarshal(b, &topic); err == nil {
+		d.Topic = topic
+		return
+	}
+	if err = json.Unmarshal(b, &users); err == nil {
+		d.Users = users
+		return
+	}
+	return
+}
+
+// Message posts a message to Zulip. If any emails have been set on the message,
+// the message will be re-routed to the PrivateMessage function.
+func (b *Bot) Message(m Message) (*http.Response, error) {
+	if m.Content == "" {
+		return nil, fmt.Errorf("content cannot be empty")
+	}
+
+	// if any emails are set, this is a private message
+	if len(m.Emails) != 0 {
+		return b.PrivateMessage(m)
+	}
+
+	// otherwise it's a stream message
+	if m.Stream == "" {
+		return nil, fmt.Errorf("stream cannot be empty")
+	}
+	if m.Topic == "" {
+		return nil, fmt.Errorf("topic cannot be empty")
+	}
+	req, err := b.constructMessageRequest(m)
+	if err != nil {
+		return nil, err
+	}
+	return b.Client.Do(req)
+}
+
+// PrivateMessage sends a message to the users in the message email slice.
+func (b *Bot) PrivateMessage(m Message) (*http.Response, error) {
+	if len(m.Emails) == 0 {
+		return nil, fmt.Errorf("there must be at least one recipient")
+	}
+	req, err := b.constructMessageRequest(m)
+	if err != nil {
+		return nil, err
+	}
+	return b.Client.Do(req)
+}
+
+// Respond sends a given message as a response to whatever context from which
+// an EventMessage was received.
+func (b *Bot) Respond(e EventMessage, response string) (*http.Response, error) {
+	if response == "" {
+		return nil, fmt.Errorf("Message response cannot be blank")
+	}
+	m := Message{
+		Stream:  e.DisplayRecipient.Topic,
+		Topic:   e.Subject,
+		Content: response,
+	}
+	if m.Topic != "" {
+		return b.Message(m)
+	}
+	// private message
+	if m.Stream == "" {
+		emails, err := b.privateResponseList(e)
+		if err != nil {
+			return nil, err
+		}
+		m.Emails = emails
+		return b.Message(m)
+	}
+	return nil, fmt.Errorf("EventMessage is not understood: %v\n", e)
+}
+
+// privateResponseList gets the list of other users in a private multiple
+// message conversation.
+func (b *Bot) privateResponseList(e EventMessage) ([]string, error) {
+	var out []string
+	for _, u := range e.DisplayRecipient.Users {
+		if u.Email != b.Email {
+			out = append(out, u.Email)
+		}
+	}
+	if len(out) == 0 {
+		return nil, fmt.Errorf("EventMessage had no Users within the DisplayRecipient")
+	}
+	return out, nil
+}
+
+// constructMessageRequest is a helper for simplifying sending a message.
+func (b *Bot) constructMessageRequest(m Message) (*http.Request, error) {
+	to := m.Stream
+	mtype := "stream"
+
+	le := len(m.Emails)
+	if le != 0 {
+		mtype = "private"
+	}
+	if le == 1 {
+		to = m.Emails[0]
+	}
+	if le > 1 {
+		to = ""
+		for i, e := range m.Emails {
+			to += e
+			if i != le-1 {
+				to += ","
+			}
+		}
+	}
+
+	values := url.Values{}
+	values.Set("type", mtype)
+	values.Set("to", to)
+	values.Set("content", m.Content)
+	if mtype == "stream" {
+		values.Set("subject", m.Topic)
+	}
+
+	return b.constructRequest("POST", "messages", values.Encode())
+}
+
+func (b *Bot) UpdateMessage(id string, content string) (*http.Response, error) {
+	//mid, _ := strconv.Atoi(id)
+	values := url.Values{}
+	values.Set("content", content)
+	req, err := b.constructRequest("PATCH", "messages/"+id, values.Encode())
+	if err != nil {
+		return nil, err
+	}
+	return b.Client.Do(req)
+}
+
+// React adds an emoji reaction to an EventMessage.
+func (b *Bot) React(e EventMessage, emoji string) (*http.Response, error) {
+	url := fmt.Sprintf("messages/%d/emoji_reactions/%s", e.ID, emoji)
+	req, err := b.constructRequest("PUT", url, "")
+	if err != nil {
+		return nil, err
+	}
+	return b.Client.Do(req)
+}
+
+// Unreact removes an emoji reaction from an EventMessage.
+func (b *Bot) Unreact(e EventMessage, emoji string) (*http.Response, error) {
+	url := fmt.Sprintf("messages/%d/emoji_reactions/%s", e.ID, emoji)
+	req, err := b.constructRequest("DELETE", url, "")
+	if err != nil {
+		return nil, err
+	}
+	return b.Client.Do(req)
+}
+
+type Emoji struct {
+	Author     string `json:"author"`
+	DisplayURL string `json:"display_url"`
+	SourceURL  string `json:"source_url"`
+}
+
+type EmojiResponse struct {
+	Emoji  map[string]*Emoji `json:"emoji"`
+	Msg    string            `json:"msg"`
+	Result string            `json:"result"`
+}
+
+// RealmEmoji gets the custom emoji information for the Zulip instance.
+func (b *Bot) RealmEmoji() (map[string]*Emoji, error) {
+	req, err := b.constructRequest("GET", "realm/emoji", "")
+	if err != nil {
+		return nil, err
+	}
+	resp, err := b.Client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var emjResp EmojiResponse
+	err = json.Unmarshal(body, &emjResp)
+	if err != nil {
+		return nil, err
+	}
+	return emjResp.Emoji, nil
+}
+
+// RealmEmojiSet makes a set of the names of the custom emoji in the Zulip instance.
+func (b *Bot) RealmEmojiSet() (map[string]struct{}, error) {
+	emj, err := b.RealmEmoji()
+	if err != nil {
+		return nil, nil
+	}
+	out := map[string]struct{}{}
+	for k, _ := range emj {
+		out[k] = struct{}{}
+	}
+	return out, nil
+}
diff --git a/vendor/github.com/matterbridge/gozulipbot/queue.go b/vendor/github.com/matterbridge/gozulipbot/queue.go
new file mode 100644
index 00000000..9a37a8e7
--- /dev/null
+++ b/vendor/github.com/matterbridge/gozulipbot/queue.go
@@ -0,0 +1,203 @@
+package gozulipbot
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"math"
+	"net/http"
+	"net/url"
+	"strconv"
+	"sync/atomic"
+	"time"
+)
+
+var (
+	HeartbeatError    = fmt.Errorf("EventMessage is a heartbeat")
+	UnauthorizedError = fmt.Errorf("Request is unauthorized")
+	BackoffError      = fmt.Errorf("Too many requests")
+	UnknownError      = fmt.Errorf("Error was unknown")
+)
+
+type Queue struct {
+	ID           string `json:"queue_id"`
+	LastEventID  int    `json:"last_event_id"`
+	MaxMessageID int    `json:"max_message_id"`
+	Bot          *Bot   `json:"-"`
+}
+
+func (q *Queue) EventsChan() (chan EventMessage, func()) {
+	end := false
+	endFunc := func() {
+		end = true
+	}
+
+	out := make(chan EventMessage)
+	go func() {
+		defer close(out)
+		for {
+			backoffTime := time.Now().Add(q.Bot.Backoff * time.Duration(math.Pow10(int(atomic.LoadInt64(&q.Bot.Retries)))))
+			minTime := time.Now().Add(q.Bot.Backoff)
+			if end {
+				return
+			}
+			ems, err := q.GetEvents()
+			switch {
+			case err == HeartbeatError:
+				time.Sleep(time.Until(minTime))
+				continue
+			case err == BackoffError:
+				time.Sleep(time.Until(backoffTime))
+				atomic.AddInt64(&q.Bot.Retries, 1)
+			case err == UnauthorizedError:
+				// TODO? have error channel when ending the continuously running process?
+				return
+			default:
+				atomic.StoreInt64(&q.Bot.Retries, 0)
+			}
+			if err != nil {
+				// TODO: handle unknown error
+				// For now, handle this like an UnauthorizedError and end the func.
+				return
+			}
+			for _, em := range ems {
+				out <- em
+			}
+			// Always make sure we wait the minimum time before asking again.
+			time.Sleep(time.Until(minTime))
+		}
+	}()
+
+	return out, endFunc
+}
+
+// EventsCallback will repeatedly call provided callback function with
+// the output of continual queue.GetEvents calls.
+// It returns a function which can be called to end the calls.
+//
+// It will end early if it receives an UnauthorizedError, or an unknown error.
+// Note, it will never return a HeartbeatError.
+func (q *Queue) EventsCallback(fn func(EventMessage, error)) func() {
+	end := false
+	endFunc := func() {
+		end = true
+	}
+	go func() {
+		for {
+			backoffTime := time.Now().Add(q.Bot.Backoff * time.Duration(math.Pow10(int(atomic.LoadInt64(&q.Bot.Retries)))))
+			minTime := time.Now().Add(q.Bot.Backoff)
+			if end {
+				return
+			}
+			ems, err := q.GetEvents()
+			switch {
+			case err == HeartbeatError:
+				time.Sleep(time.Until(minTime))
+				continue
+			case err == BackoffError:
+				time.Sleep(time.Until(backoffTime))
+				atomic.AddInt64(&q.Bot.Retries, 1)
+			case err == UnauthorizedError:
+				// TODO? have error channel when ending the continuously running process?
+				return
+			default:
+				atomic.StoreInt64(&q.Bot.Retries, 0)
+			}
+			if err != nil {
+				// TODO: handle unknown error
+				// For now, handle this like an UnauthorizedError and end the func.
+				return
+			}
+			for _, em := range ems {
+				fn(em, err)
+			}
+			// Always make sure we wait the minimum time before asking again.
+			time.Sleep(time.Until(minTime))
+		}
+	}()
+
+	return endFunc
+}
+
+// GetEvents is a blocking call that waits for and parses a list of EventMessages.
+// There will usually only be one EventMessage returned.
+// When a heartbeat is returned, GetEvents will return a HeartbeatError.
+// When an http status code above 400 is returned, one of a BackoffError,
+// UnauthorizedError, or UnknownError will be returned.
+func (q *Queue) GetEvents() ([]EventMessage, error) {
+	resp, err := q.RawGetEvents()
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	switch {
+	case resp.StatusCode == 429:
+		return nil, BackoffError
+	case resp.StatusCode == 403:
+		return nil, UnauthorizedError
+	case resp.StatusCode >= 400:
+		return nil, UnknownError
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	msgs, err := q.ParseEventMessages(body)
+	if err != nil {
+		return nil, err
+	}
+
+	return msgs, nil
+}
+
+// RawGetEvents is a blocking call that receives a response containing a list
+// of events (a.k.a. received messages) since the last message id in the queue.
+func (q *Queue) RawGetEvents() (*http.Response, error) {
+	values := url.Values{}
+	values.Set("queue_id", q.ID)
+	values.Set("last_event_id", strconv.Itoa(q.LastEventID))
+
+	url := "events?" + values.Encode()
+
+	req, err := q.Bot.constructRequest("GET", url, "")
+	if err != nil {
+		return nil, err
+	}
+
+	return q.Bot.Client.Do(req)
+}
+
+func (q *Queue) ParseEventMessages(rawEventResponse []byte) ([]EventMessage, error) {
+	rawResponse := map[string]json.RawMessage{}
+	err := json.Unmarshal(rawEventResponse, &rawResponse)
+	if err != nil {
+		return nil, err
+	}
+
+	events := []map[string]json.RawMessage{}
+	err = json.Unmarshal(rawResponse["events"], &events)
+	if err != nil {
+		return nil, err
+	}
+
+	messages := []EventMessage{}
+	for _, event := range events {
+		// if the event is a heartbeat, return a special error
+		if string(event["type"]) == `"heartbeat"` {
+			return nil, HeartbeatError
+		}
+		var msg EventMessage
+		err = json.Unmarshal(event["message"], &msg)
+		// TODO? should this check be here
+		if err != nil {
+			return nil, err
+		}
+		msg.Queue = q
+		messages = append(messages, msg)
+	}
+
+	return messages, nil
+}
diff --git a/vendor/manifest b/vendor/manifest
index 67349517..1d01e5b2 100644
--- a/vendor/manifest
+++ b/vendor/manifest
@@ -406,6 +406,14 @@
 			"notests": true
 		},
 		{
+			"importpath": "github.com/matterbridge/gozulipbot",
+			"repository": "https://github.com/matterbridge/gozulipbot",
+			"vcs": "git",
+			"revision": "b6bb12d33544893aa68904652704cf1a86ea3d18",
+			"branch": "work",
+			"notests": true
+		},
+		{
 			"importpath": "github.com/mattermost/mattermost-server/einterfaces",
 			"repository": "https://github.com/mattermost/mattermost-server",
 			"vcs": "git",