CIiP-WS-2021-2022-Projektarbeit_Lithium/main.go

package main

import (
	"github.com/geplauder/lithium/controllers"
	"net/http"
	"os"

	"io"

	"github.com/geplauder/lithium/middlewares"
	"github.com/geplauder/lithium/pipelines"
	"github.com/geplauder/lithium/settings"
	"github.com/geplauder/lithium/storage"
	"github.com/gorilla/mux"
	"github.com/sirupsen/logrus"
	"github.com/spf13/afero"
)

var GitCommit string

func RegisterRoutes(r *mux.Router, appSettings settings.Settings, pipelines []pipelines.IPipeline, storageProvider storage.IStorageProvider) {
	index := r.Methods(http.MethodGet).Subrouter()
	index.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		controllers.IndexHandler(pipelines, w, r, GitCommit)
	})

	upload := r.Methods(http.MethodPost).Subrouter()
	upload.HandleFunc("/upload", func(w http.ResponseWriter, r *http.Request) {
		controllers.UploadHandler(w, r, pipelines, storageProvider)
	})

	pipeline := r.Methods(http.MethodGet).Subrouter()
	pipeline.HandleFunc("/pipelines/{pipeline}", func(w http.ResponseWriter, r *http.Request) {
		for _, pipeline := range pipelines {
			if pipeline.GetSlug() == mux.Vars(r)["pipeline"] {
				controllers.PipelineHandler(pipeline, storageProvider, w, r)
				return
			}
		}

		w.WriteHeader(404)
	})

	if appSettings.Authentication.Enabled {
		authMiddleware := middlewares.CreateAuthenticationMiddleware(appSettings.Authentication.Token)

		upload.Use(authMiddleware.Middleware)
		pipeline.Use(authMiddleware.Middleware)
	}
}

func main() {
	logFile, err := os.OpenFile("lithium.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
	if err == nil {
		multiWriter := io.MultiWriter(os.Stdout, logFile)
		logrus.SetOutput(multiWriter)
	} else {
		logrus.SetOutput(os.Stdout)
	}

	logrus.SetFormatter(&logrus.JSONFormatter{})

	appSettings, err := settings.LoadSettings(afero.NewOsFs())
	if err != nil {
		logrus.Fatal("Unexpected error while loading settings: ", err)
	}

	var storageProvider storage.IStorageProvider

	if appSettings.StorageProvider.Type == 0 {
		storageProvider = storage.GetFileSystemStorageProvider(appSettings.StorageProvider.BasePath, "")
	} else {
		logrus.WithFields(logrus.Fields{
			"StorageProviderType": appSettings.StorageProvider.Type,
		}).Fatal("Invalid file system provided")
	}

	pipes := pipelines.LoadPipelines()

	r := mux.NewRouter()

	if appSettings.RateLimiter.Enabled {
		rateLimiterMiddleware, err := middlewares.CreateRateLimiterMiddleware(appSettings.RateLimiter.RequestsPerMinute, appSettings.RateLimiter.AllowedBurst)
		if err != nil {
			logrus.Fatal("Unexpected error while creating rate limiter middleware: ", err)
		}

		r.Use(rateLimiterMiddleware.Middleware)
	}

	RegisterRoutes(r, appSettings, pipes, storageProvider)

	logrus.Info("Lithium started, listening for requests...")

	err = http.ListenAndServe(appSettings.Endpoint, r)
	if err != nil {
		logrus.Fatal("Unexpected error while serving http server: ", err)
	}
}