first commit

.gitignore

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+*.pkg.tar.zst

LICENSE

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+MIT License
+
+Copyright (c) 2023 Lucas Schumacher
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

PKGBUILD

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+# simple PKGBUILD for packaging locally
+pkgname=telegramAlert
+pkgver=0.0.0
+pkgrel=0
+pkgdesc="Server that listens for alerts and forwards them to a telegram user"
+arch=(x86_64 i686 armv5 armv6h armv7h aarch64)
+license=("MIT")
+backup=(
+		etc/$pkgname/$pkgname.env #Don't overwrite config file
+)
+depends=()
+makedepends=("go")
+source=(
+		'main.go'
+		'go.mod'
+		'telegramAlert.env'
+		'telegramAlert.service'
+		'telegramAlert.sysusers'
+		'LICENSE'
+)
+sha256sums=(
+		'f2d19e3b2ed8244d2f539a4d9485961b5ed0fb14a29c3094387cc97124e5b571'  #main.go
+		'6d215015f4084363c15c7710b406f7981d759913b88a22060e8c8ad95a3eb18a'  #go.mod
+		'8ab2d17885a3dee972db1e74d9371cb9b35cc47fbb8c2d25968a46f3dc351002'  #telegramAlert.env
+		'6aedcf80266e272b54cf8385bf4fa9f125ab8aadc92ad1775207e55521226c7b'  #telegramAlert.service
+		'13db81008358f744fe84ca20a1f27e46dd11614ff847976a3aa2c95672cf2e02'  #telegramAlert.sysusers
+		'5dd6c227cb4a3821fd8d0ddea2b84ceb50f370b121f5e9fbd0986325948aaa78'  #LICENSE
+)
+
+build() {
+		go build -trimpath
+}
+package() {
+		install -D -m555 "$pkgname"			 "$pkgdir/usr/bin/$pkgname"
+		install -D -m644 "$pkgname.service"  "$pkgdir/usr/lib/systemd/system/$pkgname.service"
+		install -D -m644 "$pkgname.sysusers" "$pkgdir/usr/lib/sysusers.d/$pkgname.conf"
+		install -D -m600 "$pkgname.env"		 "$pkgdir/etc/$pkgname/$pkgname.env"
+		install -D -m644 "LICENSE"			 "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}

README.md

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+# telegramAlert
+Telegram bot that forwards InfluxDB Alerts to a telegream user account

go.mod

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+module telegramAlert
+
+go 1.20

main.go

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+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+var KEY string = os.Getenv("TELEGRAM_TOKEN")
+var UID string = os.Getenv("TELEGRAM_USERID")
+var VERBOSE bool = os.Getenv("VERBOSE") != ""
+var BASE_URL string = "https://api.telegram.org/bot" + KEY
+
+type InfluxAlert struct {
+	CheckID                  string  `json:"_check_id"`
+	CheckName                string  `json:"_check_name"`
+	Level                    string  `json:"_level"`
+	Measurement              string  `json:"_measurement"`
+	Message                  string  `json:"_message"`
+	NotificationEndpointID   string  `json:"_notification_endpoint_id"`
+	NotificationEndpointName string  `json:"_notification_endpoint_name"`
+	NotificationRuleID       string  `json:"_notification_rule_id"`
+	NotificationRuleName     string  `json:"_notification_rule_name"`
+	SourceMeasurement        string  `json:"_source_measurement"`
+	SourceTimestamp          float64 `json:"_source_timestamp"`
+	Start                    string  `json:"_start"`
+	StatusTimestamp          float64 `json:"_status_timestamp"`
+	Stop                     string  `json:"_stop"`
+	Time                     string  `json:"_time"`
+	Type                     string  `json:"_type"`
+	Version                  float64 `json:"_version"`
+}
+type TelegramMessage struct {
+	ChatID string `json:"chat_id"`
+	Text   string `json:"text"`
+}
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	defer r.Body.Close()
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+	dat, err := io.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "Error reading request", http.StatusInternalServerError)
+		return
+	}
+	incoming := InfluxAlert{}
+	err = json.Unmarshal(dat, &incoming)
+	if err != nil {
+		fmt.Println("Got Error unmarshaling")
+		fmt.Printf("Error: %T\n", err)
+		fmt.Println(err)
+		//http.Error
+		return
+	}
+	w.WriteHeader(http.StatusOK)
+	w.Write(nil)
+	if VERBOSE {
+		fmt.Println(string(dat))
+		// parsed, err := json.MarshalIndent(incoming, "", "    ")
+		// if err == nil {
+		// 	fmt.Println(string(parsed))
+		// }
+	}
+	fmt.Print(incoming.Time + ": ")
+	fmt.Println(incoming.Message)
+
+	// KEY := os.Getenv("TELEGRAM_TOKEN")
+	// if KEY == "" {
+	// 	fmt.Println("Error: Can not send message - no bot token set")
+	// 	return
+	// }
+	// UID := os.Getenv("TELEGRAM_USERID")
+	// if UID == "" {
+	// 	fmt.Println("Error: Can not send message - no recepient user id set")
+	// 	return
+	// }
+
+	URL := BASE_URL + "/sendMessage"
+	message := TelegramMessage{UID, incoming.Message}
+	outgoing, err := json.Marshal(message)
+	if err != nil {
+		fmt.Println("Error marshaling telegram json")
+		return
+	}
+
+	//http.Post(URL, "application/json", json.Marshal(outgoing))
+	req, err := http.NewRequest(http.MethodPost, URL, bytes.NewBuffer(outgoing))
+	//defer resp.Body.Close();
+	if err != nil {
+		fmt.Println("Error making request to telegram")
+		fmt.Printf("%T: ", err)
+		fmt.Println(err)
+		return
+	}
+	req.Header.Add("Content-Type", "application/json")
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		fmt.Println("Error posting message to telegram")
+		fmt.Printf("%T: ", err)
+		fmt.Println(err)
+		return
+	}
+	defer res.Body.Close()
+	resBody, err := io.ReadAll(res.Body)
+	if err != nil {
+		fmt.Println("Error getting response from telegram")
+		fmt.Printf("%T: ", err)
+		fmt.Println(err)
+		return
+	}
+	// fmt.Print(res.StatusCode)
+
+	print := false
+	resdata := map[string]interface{}{}
+	json.Unmarshal(resBody, &resdata)
+	if resdata["ok"] != true {
+		fmt.Println("Error telegram responded with error")
+		print = true
+		return
+	}
+
+	if VERBOSE || print {
+		pretty, err := json.MarshalIndent(resdata, "", "    ")
+		if err != nil {
+			return
+		}
+		fmt.Println(string(pretty))
+	}
+}
+func main() {
+	//TODO check if uid is valid
+	// Test KEY
+	if KEY == "" {
+		fmt.Println("Error: Can not send message - no bot token set")
+		return
+	}
+	if UID == "" {
+		fmt.Println("Error: Can not send message - no recepient user id set")
+		return
+	}
+	resp, err := http.Get(BASE_URL + "/getMe")
+	if err != nil {
+		fmt.Println("Error could not validate bot token")
+		fmt.Printf("%T: ", err)
+		fmt.Println(err)
+		return
+	}
+	defer resp.Body.Close()
+
+	me := map[string]interface{}{}
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Println("Error could not validate bot token")
+		fmt.Printf("%T: ", err)
+		fmt.Println(err)
+		return
+	}
+
+	json.Unmarshal(data, &me)
+	if me["ok"] != true {
+		fmt.Println("Error could not validate bot token")
+		//fmt.Printf("%T\n", me["ok"])
+		pretty, err := json.MarshalIndent(me, "", "    ")
+		if err != nil {
+			return
+		}
+		fmt.Println(string(pretty))
+		return
+	}
+	fmt.Println("Validated bot token")
+
+	if VERBOSE {
+		pretty, err := json.MarshalIndent(me, "", "    ")
+		if err != nil {
+			return
+		}
+		fmt.Println(string(pretty))
+	}
+
+	http.HandleFunc("/", handler)
+	fmt.Println("server started at localhost:8080")
+	err = http.ListenAndServe(":8080", nil)
+
+	if err != nil {
+		fmt.Println("!!! ERROR !!!")
+		fmt.Printf("%T: ", err)
+		fmt.Println(err)
+		panic(err)
+	}
+}

telegramAlert.env

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+TELEGRAM_TOKEN=
+TELEGRAM_USERID=

telegramAlert.service

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+[Unit]
+Description=telegramAlert
+After=network.target
+
+[Service]
+User=tgalert
+#Group=your_groupname
+ExecStart=/usr/bin/telegramAlert
+EnvironmentFile=-/etc/telegramAlert/telegramAlert.env
+# Other settings as needed
+
+[Install]
+WantedBy=multi-user.target
+

telegramAlert.sysusers

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+u tgalert - "telegramAlert daemon" /var/lib/telegramAlert