Added unit tests to referer config option and fixed bug where YAML options would be ignored.

config/config.go

@@ -14,14 +14,14 @@ import (
 var (
 	// Get the desired configuration value.
 	Get struct {
-		Debug       bool   `yaml:"debug"`
+		Debug       bool     `yaml:"debug"`
-		Folder      string `yaml:"folder"`
+		Folder      string   `yaml:"folder"`
-		Host        string `yaml:"host"`
+		Host        string   `yaml:"host"`
-		Port        uint16 `yaml:"port"`
+		Port        uint16   `yaml:"port"`
-		ShowListing bool   `yaml:"show-listing"`
+		ShowListing bool     `yaml:"show-listing"`
-		TLSCert     string `yaml:"tls-cert"`
+		TLSCert     string   `yaml:"tls-cert"`
-		TLSKey      string `yaml:"tls-key"`
+		TLSKey      string   `yaml:"tls-key"`
-		URLPrefix   string `yaml:"url-prefix"`
+		URLPrefix   string   `yaml:"url-prefix"`
 		Referrers   []string `yaml:"referrers"`
 	}
 )
@@ -31,18 +31,19 @@ const (
 	folderKey      = "FOLDER"
 	hostKey        = "HOST"
 	portKey        = "PORT"
+	referrersKey   = "REFERRERS"
 	showListingKey = "SHOW_LISTING"
 	tlsCertKey     = "TLS_CERT"
 	tlsKeyKey      = "TLS_KEY"
 	urlPrefixKey   = "URL_PREFIX"
-	referrersKey   = "REFERRERS"
 )
 
-const (
+var (
 	defaultDebug       = false
 	defaultFolder      = "/web"
 	defaultHost        = ""
 	defaultPort        = uint16(8080)
+	defaultReferrers   = []string{}
 	defaultShowListing = true
 	defaultTLSCert     = ""
 	defaultTLSKey      = ""
@@ -59,11 +60,11 @@ func setDefaults() {
 	Get.Folder = defaultFolder
 	Get.Host = defaultHost
 	Get.Port = defaultPort
+	Get.Referrers = defaultReferrers
 	Get.ShowListing = defaultShowListing
 	Get.TLSCert = defaultTLSCert
 	Get.TLSKey = defaultTLSKey
 	Get.URLPrefix = defaultURLPrefix
-	Get.Referrers = nil
 }
 
 // Load the configuration file.
@@ -111,7 +112,7 @@ func overrideWithEnvVars() {
 	Get.TLSCert = envAsStr(tlsCertKey, Get.TLSCert)
 	Get.TLSKey = envAsStr(tlsKeyKey, Get.TLSKey)
 	Get.URLPrefix = envAsStr(urlPrefixKey, Get.URLPrefix)
-	Get.Referrers = strAsArray(envAsStr(referrersKey, ""))
+	Get.Referrers = envAsStrSlice(referrersKey, Get.Referrers)
 }
 
 // validate the configuration.
@@ -154,6 +155,15 @@ func envAsStr(key, fallback string) string {
 	return fallback
 }
 
+// envAsStrSlice returns the value of the environment variable as a slice of
+// strings if set.
+func envAsStrSlice(key string, fallback []string) []string {
+	if value := os.Getenv(key); "" != value {
+		return strings.Split(value, ",")
+	}
+	return fallback
+}
+
 // envAsUint16 returns the value of the environment variable as a uint16 if set.
 func envAsUint16(key string, fallback uint16) uint16 {
 	// Retrieve the string value of the environment variable. If not set,
@@ -215,11 +225,3 @@ func strAsBool(value string) (result bool, err error) {
 	}
 	return
 }
-
-func strAsArray(value string) (result []string) {
-	if (value == "") {
-		return nil
-	}
-	result = strings.Split(value, ",");
-	return
-}

config/config_test.go

@@ -7,7 +7,7 @@ import (
 	"strconv"
 	"testing"
 
-	"gopkg.in/yaml.v2"
+	yaml "gopkg.in/yaml.v2"
 )
 
 func TestLoad(t *testing.T) {
@@ -245,6 +245,98 @@ func TestEnvAsStr(t *testing.T) {
 	}
 }
 
+func TestEnvAsStrSlice(t *testing.T) {
+	oe := "ONE_ENTRY"
+	oewc := "ONE_ENTRY_WITH_COMMA"
+	oewtc := "ONE_ENTRY_WITH_TRAILING_COMMA"
+	te := "TWO_ENTRY"
+	tewc := "TWO_ENTRY_WITH_COMMA"
+	oc := "ONLY_COMMA"
+	ev := "EMPTY_VALUE"
+	uv := "UNSET_VALUE"
+
+	fs := "http://my.site"
+	ts := "http://other.site"
+	fbr := []string{"one", "two"}
+	var efbr []string
+
+	oes := fs
+	oer := []string{fs}
+	oewcs := "," + fs
+	oewcr := []string{"", fs}
+	oewtcs := fs + ","
+	oewtcr := []string{fs, ""}
+	tes := fs + "," + ts
+	ter := []string{fs, ts}
+	tewcs := "," + fs + "," + ts
+	tewcr := []string{"", fs, ts}
+	ocs := ","
+	ocr := []string{"", ""}
+	evs := ""
+
+	os.Setenv(oe, oes)
+	os.Setenv(oewc, oewcs)
+	os.Setenv(oewtc, oewtcs)
+	os.Setenv(te, tes)
+	os.Setenv(tewc, tewcs)
+	os.Setenv(oc, ocs)
+	os.Setenv(ev, evs)
+
+	testCases := []struct {
+		name     string
+		key      string
+		fallback []string
+		result   []string
+	}{
+		{"One entry", oe, fbr, oer},
+		{"One entry w/comma", oewc, fbr, oewcr},
+		{"One entry w/trailing comma", oewtc, fbr, oewtcr},
+		{"Two entry", te, fbr, ter},
+		{"Two entry w/comma", tewc, fbr, tewcr},
+		{"Only comma", oc, fbr, ocr},
+		{"Empty value w/fallback", ev, fbr, fbr},
+		{"Empty value wo/fallback", ev, efbr, efbr},
+		{"Unset w/fallback", uv, fbr, fbr},
+		{"Unset wo/fallback", uv, efbr, efbr},
+	}
+
+	matches := func(a, b []string) bool {
+		if len(a) != len(b) {
+			return false
+		}
+		tally := make(map[int]bool)
+		for i := range a {
+			tally[i] = false
+		}
+		for _, val := range a {
+			for i, other := range b {
+				if other == val && !tally[i] {
+					tally[i] = true
+					break
+				}
+			}
+		}
+		for _, found := range tally {
+			if !found {
+				return false
+			}
+		}
+		return true
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := envAsStrSlice(tc.key, tc.fallback)
+			if !matches(tc.result, result) {
+				t.Errorf(
+					"For %s with a '%v' fallback expected '%v' but got '%v'",
+					tc.key, tc.fallback, tc.result, result,
+				)
+			}
+		})
+	}
+}
+
 func TestEnvAsUint16(t *testing.T) {
 	ubv := "UPPER_BOUNDS_VALUE"
 	lbv := "LOWER_BOUNDS_VALUE"