Refactor config package

- Parse configuration only once during startup time
- Store configuration values in a global variable

config/options.go

@@ -0,0 +1,214 @@
+// Copyright 2019 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package config // import "miniflux.app/config"
+
+const (
+	defaultBaseURL            = "http://localhost"
+	defaultWorkerPoolSize     = 5
+	defaultPollingFrequency   = 60
+	defaultBatchSize          = 10
+	defaultDatabaseURL        = "user=postgres password=postgres dbname=miniflux2 sslmode=disable"
+	defaultDatabaseMaxConns   = 20
+	defaultDatabaseMinConns   = 1
+	defaultArchiveReadDays    = 60
+	defaultListenAddr         = "127.0.0.1:8080"
+	defaultCertFile           = ""
+	defaultKeyFile            = ""
+	defaultCertDomain         = ""
+	defaultCertCache          = "/tmp/cert_cache"
+	defaultCleanupFrequency   = 24
+	defaultProxyImages        = "http-only"
+	defaultOAuth2ClientID     = ""
+	defaultOAuth2ClientSecret = ""
+	defaultOAuth2RedirectURL  = ""
+	defaultOAuth2Provider     = ""
+)
+
+// Options contains configuration options.
+type Options struct {
+	HTTPS                     bool
+	hsts                      bool
+	httpService               bool
+	schedulerService          bool
+	debug                     bool
+	baseURL                   string
+	rootURL                   string
+	basePath                  string
+	databaseURL               string
+	databaseMaxConns          int
+	databaseMinConns          int
+	runMigrations             bool
+	listenAddr                string
+	certFile                  string
+	certDomain                string
+	certCache                 string
+	certKeyFile               string
+	cleanupFrequency          int
+	archiveReadDays           int
+	pollingFrequency          int
+	batchSize                 int
+	workerPoolSize            int
+	createAdmin               bool
+	proxyImages               string
+	oauth2UserCreationAllowed bool
+	oauth2ClientID            string
+	oauth2ClientSecret        string
+	oauth2RedirectURL         string
+	oauth2Provider            string
+	pocketConsumerKey         string
+}
+
+// HasDebugMode returns true if debug mode is enabled.
+func (o *Options) HasDebugMode() bool {
+	return o.debug
+}
+
+// BaseURL returns the application base URL with path.
+func (o *Options) BaseURL() string {
+	return o.baseURL
+}
+
+// RootURL returns the base URL without path.
+func (o *Options) RootURL() string {
+	return o.rootURL
+}
+
+// BasePath returns the application base path according to the base URL.
+func (o *Options) BasePath() string {
+	return o.basePath
+}
+
+// IsDefaultDatabaseURL returns true if the default database URL is used.
+func (o *Options) IsDefaultDatabaseURL() bool {
+	return o.databaseURL == defaultDatabaseURL
+}
+
+// DatabaseURL returns the database URL.
+func (o *Options) DatabaseURL() string {
+	return o.databaseURL
+}
+
+// DatabaseMaxConns returns the maximum number of database connections.
+func (o *Options) DatabaseMaxConns() int {
+	return o.databaseMaxConns
+}
+
+// DatabaseMinConns returns the minimum number of database connections.
+func (o *Options) DatabaseMinConns() int {
+	return o.databaseMinConns
+}
+
+// ListenAddr returns the listen address for the HTTP server.
+func (o *Options) ListenAddr() string {
+	return o.listenAddr
+}
+
+// CertFile returns the SSL certificate filename if any.
+func (o *Options) CertFile() string {
+	return o.certFile
+}
+
+// CertKeyFile returns the private key filename for custom SSL certificate.
+func (o *Options) CertKeyFile() string {
+	return o.certKeyFile
+}
+
+// CertDomain returns the domain to use for Let's Encrypt certificate.
+func (o *Options) CertDomain() string {
+	return o.certDomain
+}
+
+// CertCache returns the directory to use for Let's Encrypt session cache.
+func (o *Options) CertCache() string {
+	return o.certCache
+}
+
+// CleanupFrequency returns the interval for cleanup jobs.
+func (o *Options) CleanupFrequency() int {
+	return o.cleanupFrequency
+}
+
+// WorkerPoolSize returns the number of background worker.
+func (o *Options) WorkerPoolSize() int {
+	return o.workerPoolSize
+}
+
+// PollingFrequency returns the interval to refresh feeds in the background.
+func (o *Options) PollingFrequency() int {
+	return o.pollingFrequency
+}
+
+// BatchSize returns the number of feeds to send for background processing.
+func (o *Options) BatchSize() int {
+	return o.batchSize
+}
+
+// IsOAuth2UserCreationAllowed returns true if user creation is allowed for OAuth2 users.
+func (o *Options) IsOAuth2UserCreationAllowed() bool {
+	return o.oauth2UserCreationAllowed
+}
+
+// OAuth2ClientID returns the OAuth2 Client ID.
+func (o *Options) OAuth2ClientID() string {
+	return o.oauth2ClientID
+}
+
+// OAuth2ClientSecret returns the OAuth2 client secret.
+func (o *Options) OAuth2ClientSecret() string {
+	return o.oauth2ClientSecret
+}
+
+// OAuth2RedirectURL returns the OAuth2 redirect URL.
+func (o *Options) OAuth2RedirectURL() string {
+	return o.oauth2RedirectURL
+}
+
+// OAuth2Provider returns the name of the OAuth2 provider configured.
+func (o *Options) OAuth2Provider() string {
+	return o.oauth2Provider
+}
+
+// HasHSTS returns true if HTTP Strict Transport Security is enabled.
+func (o *Options) HasHSTS() bool {
+	return o.hsts
+}
+
+// RunMigrations returns true if the environment variable RUN_MIGRATIONS is not empty.
+func (o *Options) RunMigrations() bool {
+	return o.runMigrations
+}
+
+// CreateAdmin returns true if the environment variable CREATE_ADMIN is not empty.
+func (o *Options) CreateAdmin() bool {
+	return o.createAdmin
+}
+
+// ProxyImages returns "none" to never proxy, "http-only" to proxy non-HTTPS, "all" to always proxy.
+func (o *Options) ProxyImages() string {
+	return o.proxyImages
+}
+
+// HasHTTPService returns true if the HTTP service is enabled.
+func (o *Options) HasHTTPService() bool {
+	return o.httpService
+}
+
+// HasSchedulerService returns true if the scheduler service is enabled.
+func (o *Options) HasSchedulerService() bool {
+	return o.schedulerService
+}
+
+// ArchiveReadDays returns the number of days after which marking read items as removed.
+func (o *Options) ArchiveReadDays() int {
+	return o.archiveReadDays
+}
+
+// PocketConsumerKey returns the Pocket Consumer Key if configured.
+func (o *Options) PocketConsumerKey(defaultValue string) string {
+	if o.pocketConsumerKey != "" {
+		return o.pocketConsumerKey
+	}
+	return defaultValue
+}