gh-1 initial commit

Dockerfile

@@ -0,0 +1,17 @@
+# ---- Build container
+FROM golang:alpine AS builder
+WORKDIR /synology-notifications
+COPY . .
+RUN apk add --no-cache git
+RUN go build -v ./...
+
+# ---- App container
+FROM alpine:latest as synology-notifications
+EXPOSE 8080
+ENV API_KEY=
+ENV SLACK_WEBHOOK=
+ENV LISTEN_PORT=8080
+RUN apk --no-cache add ca-certificates
+COPY --from=builder synology-notifications/synology-notifications /
+ENTRYPOINT ./synology-notifications
+LABEL Name=synology-notifications Version=0.0.1

go.mod

@@ -0,0 +1,10 @@
+module github.com/ryancurrah/synology-notifications
+
+go 1.12
+
+require (
+	github.com/caarlos0/env v3.5.0+incompatible
+	github.com/gorilla/websocket v1.4.0 // indirect
+	github.com/nlopes/slack v0.5.0
+	github.com/pkg/errors v0.8.1 // indirect
+)

go.sum

@@ -0,0 +1,8 @@
+github.com/caarlos0/env v3.5.0+incompatible h1:Yy0UN8o9Wtr/jGHZDpCBLpNrzcFLLM2yixi/rBrKyJs=
+github.com/caarlos0/env v3.5.0+incompatible/go.mod h1:tdCsowwCzMLdkqRYDlHpZCp2UooDD3MspDBjZ2AD02Y=
+github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
+github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/nlopes/slack v0.5.0 h1:NbIae8Kd0NpqaEI3iUrsuS0KbcEDhzhc939jLW5fNm0=
+github.com/nlopes/slack v0.5.0/go.mod h1:jVI4BBK3lSktibKahxBF74txcK2vyvkza1z/+rRnVAM=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=

main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+
+	"github.com/caarlos0/env"
+	"github.com/nlopes/slack"
+)
+
+var appConfig = AppConfig{}
+var slackConfig = SlackConfig{}
+
+type SynologyMessage struct {
+	Message string `json:"message"`
+}
+
+type AppConfig struct {
+	ListenPort string `env:"LISTEN_PORT" envDefault:"8080"`
+	ApiKey     string `env:"API_KEY,required"`
+}
+
+type SlackConfig struct {
+	Webhook string `env:"SLACK_WEBHOOK,required"`
+}
+
+// PostHandler send notifcations from synology to slack
+func PostHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Header.Get("api_key") != appConfig.ApiKey {
+		http.Error(w, "invalid api key", http.StatusUnauthorized)
+		log.Printf("invalid api key")
+		return
+	}
+
+	if r.Method == "POST" {
+		body, err := ioutil.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, "error reading request body", http.StatusInternalServerError)
+			log.Printf("error reading request body: %s", err)
+			return
+		}
+
+		synologyMessage := SynologyMessage{}
+		err = json.Unmarshal(body, &synologyMessage)
+		if err != nil {
+			http.Error(w, "error reading request body", http.StatusInternalServerError)
+			log.Printf("error reading request body: %s", err)
+			return
+		}
+
+		msg := slack.WebhookMessage{Attachments: []slack.Attachment{{Color: "warning", Text: fmt.Sprintf("%s", synologyMessage.Message)}}}
+
+		err = slack.PostWebhook(slackConfig.Webhook, &msg)
+		if err != nil {
+			http.Error(w, "error sendming slack message", http.StatusInternalServerError)
+			log.Printf("error sendming slack message: %s", err)
+			return
+		}
+	} else {
+		http.Error(w, "invalid request method", http.StatusMethodNotAllowed)
+		return
+	}
+}
+
+func main() {
+	err := env.Parse(&appConfig)
+	if err != nil {
+		panic(err)
+	}
+
+	err = env.Parse(&slackConfig)
+	if err != nil {
+		panic(err)
+	}
+
+	if len(appConfig.ApiKey) < 32 {
+		panic(fmt.Errorf("api key not long enough it should be 32 characters long not %d", len(appConfig.ApiKey)))
+	}
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", PostHandler)
+
+	log.Printf("listening on port %s", appConfig.ListenPort)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", appConfig.ListenPort), mux))
+}