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pear.go
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pear.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"strings"
"time"
"github.com/hashicorp/go-hclog"
"github.com/jmoiron/sqlx"
"github.com/slack-go/slack"
)
const (
AppName = "pear"
SeedBlock = "seed-block"
SeedSubmit = "submit-seed"
SeedCancel = "cancel-seed"
PickBlock = "pear-block"
PickPear = "pick-pear"
)
type PearService struct {
client *slack.Client
db *sqlx.DB
secret string
channel string
logger hclog.Logger
}
type Seed struct {
ID int `db:"id"`
Sower string `db:"sower"`
Topic string `db:"topic"`
Planted time.Time `db:"planted"`
}
type Pear struct {
ID int `db:"id"`
SeedID int `db:"seed_id"`
Picker string `db:"picker"`
Picked time.Time `db:"picked"`
}
type PearJoin struct {
Sower string `db:"sower"`
Picker string `db:"picker"`
Topic string `db:"topic"`
Picked time.Time `db:"picked"`
}
func NewPearService(conf *Config, logger hclog.Logger) (*PearService, error) {
db, err := InitPG(conf.DatabaseUrl, logger)
if err != nil {
return nil, err
}
return &PearService{
client: slack.New(conf.SlackToken),
secret: conf.SlackSecret,
db: db,
channel: conf.Channel,
logger: logger,
}, nil
}
func (ps *PearService) VerifyRequest(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
verifier, err := slack.NewSecretsVerifier(r.Header, ps.secret)
if err != nil {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
verifier.Write(b)
if err = verifier.Ensure(); err != nil {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
r.Body = ioutil.NopCloser(bytes.NewReader(b))
next.ServeHTTP(w, r)
})
}
func (ps *PearService) HandleNew(sc slack.SlashCommand) (slack.Msg, error) {
if sc.Text == "list" {
return ps.ListResponse(sc.UserID)
}
return SlashResponse(sc.Text), nil
}
func (ps *PearService) ListResponse(user string) (slack.Msg, error) {
pjs, err := ps.ListPearJoins(user)
if err != nil {
return slack.Msg{}, err
}
var output string
if len(pjs) == 1 {
output = "You have picked 1 pear!\n"
} else {
output = fmt.Sprintf("You have picked %d pears!\n", len(pjs))
}
output = output + formatPearJoins(pjs)
outputText := slack.NewTextBlockObject(slack.MarkdownType, output, false, false)
outputSection := slack.NewSectionBlock(outputText, nil, nil)
msg := slack.NewBlockMessage(outputSection)
return msg.Msg, nil
}
func formatPearJoins(pjs []*PearJoin) string {
var output strings.Builder
for _, pj := range pjs {
output.WriteString(fmt.Sprintf("<@%s>: %s on <!date^%d^{date_short} at {time}|%s>\n", pj.Sower, pj.Topic, pj.Picked.Unix(), pj.Picked.Format(time.RFC822)))
}
return output.String()
}
func (ps *PearService) ListPearJoins(user string) ([]*PearJoin, error) {
var pjs []*PearJoin
err := ps.db.Select(&pjs, "SELECT picker, sower, topic, picked FROM seed JOIN pear ON seed.id = pear.seed_id WHERE picker = $1", user)
if err != nil {
return nil, fmt.Errorf("error selecting pear join: %w", err)
}
return pjs, nil
}
func (ps *PearService) HandleSubmit(ic *slack.InteractionCallback) error {
if len(ic.ActionCallback.BlockActions) != 1 {
return errors.New("invalid number of block actions")
}
action := ic.ActionCallback.BlockActions[0]
var err error
switch action.ActionID {
case SeedSubmit:
ps.logger.Debug("handling seed submitSeed")
seed, err := ps.submitSeed(ic)
if err != nil {
return err
}
if err = ps.growSeed(seed); err != nil {
ps.logger.Error("error posting slack message", "error", err)
return err
}
case SeedCancel:
// do cancel stuff
ps.logger.Debug("canceling seed")
err = ps.postMsg(ic, slack.Msg{DeleteOriginal: true})
case PickPear:
ps.logger.Debug("picking pear")
err := ps.PickPear(ic)
if err != nil {
return err
}
default:
ps.logger.Debug("using default")
err = ps.postMsg(ic, slack.Msg{DeleteOriginal: true})
}
return err
}
func (ps *PearService) postMsg(ic *slack.InteractionCallback, msgs ...slack.Msg) error {
for _, msg := range msgs {
b, _ := json.Marshal(&msg)
ps.logger.Debug("outgoing message", "msg", string(b))
resp, err := http.Post(ic.ResponseURL, ApplicationJson, bytes.NewReader(b))
if err != nil {
ps.logger.Error("error responding", "status_code", resp.StatusCode)
return err
}
if ps.logger.IsDebug() {
b, _ := ioutil.ReadAll(resp.Body)
resp.Body.Close()
ps.logger.Debug("response", "resp", string(b))
}
}
return nil
}
func (ps *PearService) growSeed(seed *Seed) error {
block := formatGrowMsg(seed)
_, _, err := ps.client.PostMessage(ps.channel, slack.MsgOptionBlocks(block))
return err
}
func formatGrowMsg(seed *Seed) slack.Block {
pickBtnText := slack.NewTextBlockObject(slack.PlainTextType, "Pick :pear:", false, false)
pickBtn := slack.NewButtonBlockElement(PickPear, strconv.Itoa(seed.ID), pickBtnText)
btnAccessory := slack.NewAccessory(pickBtn)
req := fmt.Sprintf("<@%s> wants to learn %s. :seedling:", seed.Sower, seed.Topic)
headerText := slack.NewTextBlockObject(slack.MarkdownType, req, false, false)
headerSection := slack.NewSectionBlock(headerText, nil, btnAccessory)
return headerSection
}
func (ps *PearService) submitSeed(ic *slack.InteractionCallback) (*Seed, error) {
seed := &Seed{
Sower: ic.User.ID,
Planted: time.Now(),
Topic: ic.ActionCallback.BlockActions[0].Value,
}
if seed.Topic == "" {
return nil, errors.New("topic required")
}
id, err := ps.PlantSeed(seed)
seed.ID = id
if err != nil {
return seed, err
}
msg := seedPlantedMsg()
if err = ps.postMsg(ic, msg); err != nil {
return seed, err
}
return seed, nil
}
func seedPlantedMsg() slack.Msg {
headerText := slack.NewTextBlockObject(slack.MarkdownType, "Pear seed planted! :seedling:", false, false)
headerSection := slack.NewSectionBlock(headerText, nil, nil)
msg := slack.NewBlockMessage(headerSection)
msg.ResponseType = slack.ResponseTypeEphemeral
msg.ReplaceOriginal = true
return msg.Msg
}
func (ps *PearService) FetchSeed(id int) (*Seed, error) {
var seed Seed
err := ps.db.Get(&seed, "SELECT * from seed WHERE id = $1", id)
if err != nil {
return nil, fmt.Errorf("error fetching seed: %v", err)
}
return &seed, nil
}
func (ps *PearService) PlantSeed(s *Seed) (int, error) {
rows, err := ps.db.NamedQuery("INSERT INTO seed (sower, topic, planted) VALUES (:sower, :topic, now()) RETURNING id", s)
if err != nil {
return -1, err
}
defer rows.Close()
var id int
rows.Next()
err = rows.Scan(&id)
if err != nil {
return -1, err
}
return id, nil
}
func (ps *PearService) PickPear(ic *slack.InteractionCallback) error {
seedID, err := strconv.Atoi(ic.ActionCallback.BlockActions[0].Value)
if err != nil {
return err
}
pear := &Pear{
SeedID: seedID,
Picker: ic.User.ID,
}
_, err = ps.StorePear(pear)
if err != nil {
return err
}
msg, err := formatPickResponse(ic)
if err != nil {
return err
}
if err = ps.postMsg(ic, msg); err != nil {
return fmt.Errorf("unable to post pick response: %v", err)
}
seed, err := ps.FetchSeed(seedID)
if err != nil {
return err
}
channel, _, _, err := ps.client.OpenConversation(
&slack.OpenConversationParameters{
Users: []string{ic.User.ID, seed.Sower},
},
)
if err != nil {
return err
}
pmMsg := fmt.Sprintf(
"<@%s> offered to help you learn %s!\nBear Fruit! :pear:",
ic.User.ID,
seed.Topic,
)
_, _, err = ps.client.PostMessage(channel.ID, slack.MsgOptionText(pmMsg, false))
return err
}
func formatPickResponse(ic *slack.InteractionCallback) (slack.Msg, error) {
resp := fmt.Sprintf("<@%s> picked this pear.", ic.User.ID)
contextText := slack.NewTextBlockObject(slack.MarkdownType, resp, false, false)
contextBlock := slack.NewContextBlock("", contextText)
var msgText *slack.TextBlockObject
for _, block := range ic.Message.Blocks.BlockSet {
if section, ok := block.(*slack.SectionBlock); ok {
msgText = section.Text
break
}
}
if msgText == nil {
return slack.Msg{}, errors.New("unable to find sectionBlock")
}
sectionBlock := slack.NewSectionBlock(msgText, nil, nil)
msg := slack.NewBlockMessage(sectionBlock, contextBlock)
msg.ReplaceOriginal = true
return msg.Msg, nil
}
func (ps *PearService) StorePear(pear *Pear) (int, error) {
rows, err := ps.db.NamedQuery("INSERT INTO pear (seed_id, picker, picked) VALUES (:seed_id, :picker, now()) RETURNING id", pear)
if err != nil {
return -1, err
}
defer rows.Close()
var id int
err = rows.Scan(&id)
if err != nil {
return -1, nil
}
return id, nil
}
func SlashResponse(text string) slack.Msg {
resp := fmt.Sprintf("Do you want to learn *%s*?", text)
headerText := slack.NewTextBlockObject(slack.MarkdownType, resp, false, false)
headerSection := slack.NewSectionBlock(headerText, nil, nil)
submitBtnText := slack.NewTextBlockObject(slack.PlainTextType, "Yes", false, false)
submitBtn := slack.NewButtonBlockElement(SeedSubmit, text, submitBtnText)
cancelBtnText := slack.NewTextBlockObject(slack.PlainTextType, "Cancel", false, false)
cancelBtn := slack.NewButtonBlockElement(SeedCancel, "cancel", cancelBtnText)
actionBlock := slack.NewActionBlock(SeedBlock, submitBtn, cancelBtn)
msg := slack.NewBlockMessage(headerSection, actionBlock)
msg.ResponseType = slack.ResponseTypeEphemeral
return msg.Msg
}