|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "encoding/json" |
| 5 | + "fmt" |
| 6 | + "log" |
| 7 | + "net/http" |
| 8 | + "os" |
| 9 | + "strings" |
| 10 | + "time" |
| 11 | + |
| 12 | + "github.com/nlopes/slack" |
| 13 | +) |
| 14 | + |
| 15 | +const waitBetweenChecks = time.Minute * 5 |
| 16 | + |
| 17 | +func main() { |
| 18 | + slackApiToken := os.Getenv("SLACK_API_TOKEN") |
| 19 | + if "" == slackApiToken { |
| 20 | + log.Fatalln("The environment variable \"SLACK_API_TOKEN\" is not set.") |
| 21 | + } |
| 22 | + |
| 23 | + tagToChannel := os.Getenv("TAG_TO_CHANNEL") |
| 24 | + if "" == tagToChannel { |
| 25 | + log.Fatalln("The environment variable \"TAG_TO_CHANNEL\" is not set.") |
| 26 | + } |
| 27 | + |
| 28 | + var tagToChannelName map[string]string |
| 29 | + err := json.Unmarshal([]byte(tagToChannel), &tagToChannelName) |
| 30 | + if err != nil { |
| 31 | + log.Panicln("Unable to parse JSON data provided in \"TAG_TO_CHANNEL\".") |
| 32 | + log.Fatal(err) |
| 33 | + } |
| 34 | + |
| 35 | + stackSite := os.Getenv("STACK_SITE") |
| 36 | + if stackSite == "" { |
| 37 | + stackSite = "stackoverflow" |
| 38 | + } |
| 39 | + |
| 40 | + runSlackClient(slackApiToken, stackSite, tagToChannelName, os.Getenv("DEBUG") == "1") |
| 41 | +} |
| 42 | + |
| 43 | +func runSlackClient(slackApiToken string, stackSite string, tagToChannelName map[string]string, debug bool) { |
| 44 | + api := slack.New(slackApiToken) |
| 45 | + logger := log.New(os.Stdout, "slack-bot: ", log.Lshortfile|log.LstdFlags) |
| 46 | + |
| 47 | + slack.SetLogger(logger) |
| 48 | + api.SetDebug(debug) |
| 49 | + |
| 50 | + rtm := api.NewRTM() |
| 51 | + go rtm.ManageConnection() |
| 52 | + |
| 53 | + for msg := range rtm.IncomingEvents { |
| 54 | + switch ev := msg.Data.(type) { |
| 55 | + case *slack.ConnectedEvent: |
| 56 | + if ev.ConnectionCount != 1 { |
| 57 | + log.Fatalln("This bot is already connected") |
| 58 | + } |
| 59 | + |
| 60 | + tagToChannelId := make(map[string]string, len(tagToChannelName)) |
| 61 | + |
| 62 | + OUTER: |
| 63 | + for tagName, channelName := range tagToChannelName { |
| 64 | + for _, channel := range ev.Info.Channels { |
| 65 | + if channelName == channel.Name { |
| 66 | + tagToChannelId[tagName] = channel.ID |
| 67 | + |
| 68 | + continue OUTER |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + log.Fatalf("The channel \"%s\" doesn't exist.", channelName) |
| 73 | + } |
| 74 | + |
| 75 | + watchStack(rtm, tagToChannelId, stackSite) |
| 76 | + } |
| 77 | + } |
| 78 | +} |
| 79 | + |
| 80 | +func watchStack(rtm *slack.RTM, tagToChannelId map[string]string, stackSite string) { |
| 81 | + lastCreationDate := 0 |
| 82 | + |
| 83 | + tags := make([]string, len(tagToChannelId)) |
| 84 | + i := 0 |
| 85 | + for tag := range tagToChannelId { |
| 86 | + tags[i] = tag |
| 87 | + i++ |
| 88 | + } |
| 89 | + |
| 90 | + baseUrl := fmt.Sprintf("https://api.stackexchange.com/2.2/search?order=desc&sort=creation&tagged=%s&site=%s", strings.Join(tags, ";"), stackSite) |
| 91 | + for { |
| 92 | + var url string |
| 93 | + if lastCreationDate > 0 { |
| 94 | + url = fmt.Sprintf("%s&min=%d", baseUrl, lastCreationDate) |
| 95 | + } else { |
| 96 | + url= baseUrl |
| 97 | + } |
| 98 | + |
| 99 | + resp, err := http.Get(url) |
| 100 | + if err != nil { |
| 101 | + log.Print(err) |
| 102 | + |
| 103 | + time.Sleep(waitBetweenChecks) |
| 104 | + continue |
| 105 | + } |
| 106 | + |
| 107 | + type Owner struct { |
| 108 | + DisplayName string `json:"display_name"` |
| 109 | + } |
| 110 | + |
| 111 | + type Item struct { |
| 112 | + Tags []string `json:tags` |
| 113 | + Owner Owner `json:owner` |
| 114 | + CreationDate int `json:"creation_date"` |
| 115 | + Title string `json:title` |
| 116 | + Link string `json:link` |
| 117 | + } |
| 118 | + |
| 119 | + type Response struct { |
| 120 | + Items []Item `json:items` |
| 121 | + } |
| 122 | + |
| 123 | + var stackResponse = new(Response) |
| 124 | + err = json.NewDecoder(resp.Body).Decode(&stackResponse) |
| 125 | + if err != nil { |
| 126 | + log.Print(err) |
| 127 | + |
| 128 | + time.Sleep(waitBetweenChecks) |
| 129 | + continue |
| 130 | + } |
| 131 | + |
| 132 | + for _, item := range stackResponse.Items { |
| 133 | + for _, tag := range item.Tags { |
| 134 | + if channelId, ok := tagToChannelId[tag]; ok { |
| 135 | + fmt.Printf("%v", channelId) |
| 136 | + |
| 137 | + rtm.SendMessage(rtm.NewOutgoingMessage(fmt.Sprintf("%s (%s) by %s. Tags: %s\n", item.Title, item.Link, item.Owner.DisplayName, strings.Join(item.Tags, ", ")), channelId)) |
| 138 | + } |
| 139 | + } |
| 140 | + |
| 141 | + if item.CreationDate > lastCreationDate { |
| 142 | + lastCreationDate = item.CreationDate |
| 143 | + } |
| 144 | + } |
| 145 | + |
| 146 | + time.Sleep(waitBetweenChecks) |
| 147 | + } |
| 148 | +} |
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