Some refactorings

server/middlewares.go

@@ -135,7 +135,7 @@ func clientUniqueIDMiddleware(next http.Handler) http.Handler {
 				HttpOnly: true,
 				Secure:   true,
 				SameSite: http.SameSiteStrictMode,
-				Path:     IfZero(conf.Server.BasePath, "/"),
+				Path:     If(conf.Server.BasePath, "/"),
 			}
 			http.SetCookie(w, c)
 		} else {
@@ -210,11 +210,11 @@ func serverAddress(r *http.Request) (scheme, host string) {
 		}
 		xfh = xfh[:i]
 	}
-	host = firstOr(r.Host, xfh)
+	host = FirstOr(r.Host, xfh)
 
 	// Determine the protocol and scheme of the request based on the presence of
 	// X-Forwarded-* headers or the scheme of the request URL.
-	scheme = firstOr(
+	scheme = FirstOr(
 		protocol,
 		r.Header.Get(xForwardedProto),
 		r.Header.Get(xForwardedScheme),
@@ -231,17 +231,6 @@ func serverAddress(r *http.Request) (scheme, host string) {
 	return scheme, host
 }
 
-// firstOr is a helper function that returns the first non-empty string from a list
-// of strings, or a default value if all the strings are empty.
-func firstOr(or string, strings ...string) string {
-	for _, s := range strings {
-		if s != "" {
-			return s
-		}
-	}
-	return or
-}
-
 // URLParamsMiddleware is a middleware function that decodes the query string of
 // the incoming HTTP request, adds the URL parameters from the routing context,
 // and re-encodes the modified query string.

server/server.go

@@ -171,7 +171,7 @@ func AbsoluteURL(r *http.Request, u string, params url.Values) string {
 	if strings.HasPrefix(u, "/") {
 		buildUrl.Path = path.Join(conf.Server.BasePath, buildUrl.Path)
 		if conf.Server.BaseHost != "" {
-			buildUrl.Scheme = IfZero(conf.Server.BaseScheme, "http")
+			buildUrl.Scheme = If(conf.Server.BaseScheme, "http")
 			buildUrl.Host = conf.Server.BaseHost
 		} else {
 			buildUrl.Scheme = r.URL.Scheme

server/subsonic/middlewares.go

@@ -166,7 +166,7 @@ func getPlayer(players core.Players) func(next http.Handler) http.Handler {
 					MaxAge:   consts.CookieExpiry,
 					HttpOnly: true,
 					SameSite: http.SameSiteStrictMode,
-					Path:     IfZero(conf.Server.BasePath, "/"),
+					Path:     If(conf.Server.BasePath, "/"),
 				}
 				http.SetCookie(w, cookie)
 			}

utils/gg/gg.go

@@ -1,14 +1,32 @@
 // Package gg implements simple "extensions" to Go language. Based on https://github.com/icza/gog
 package gg
 
-// IfZero returns v if it is a non-zero value, orElse otherwise.
+// If returns v if it is a non-zero value, orElse otherwise.
 //
 // This is similar to elvis operator (?:) in Groovy and other languages.
 // Note: Different from the real elvis operator, the orElse expression will always get evaluated.
-func IfZero[T comparable](v T, orElse T) T {
+func If[T comparable](v T, orElse T) T {
 	var zero T
 	if v != zero {
 		return v
 	}
 	return orElse
 }
+
+// FirstOr is a generic helper function that returns the first non-zero value from
+// a list of comparable values, or a default value if all the values are zero.
+func FirstOr[T comparable](or T, values ...T) T {
+	// Initialize a zero value of the same type as the input values.
+	var zero T
+
+	// Loop through each input value and check if it is non-zero. If a non-zero value
+	// is found, return it immediately.
+	for _, v := range values {
+		if v != zero {
+			return v
+		}
+	}
+
+	// If all the input values are zero, return the default value.
+	return or
+}

utils/gg/gg_test.go

@@ -15,29 +15,45 @@ func TestGG(t *testing.T) {
 	RunSpecs(t, "GG Suite")
 }
 
-var _ = Describe("IfZero", func() {
-	DescribeTable("string",
-		func(v, orElse, expected string) {
-			Expect(gg.IfZero(v, orElse)).To(Equal(expected))
-		},
-		Entry("zero value", "", "default", "default"),
-		Entry("non-zero value", "anything", "default", "anything"),
-	)
-	DescribeTable("numeric",
-		func(v, orElse, expected int) {
-			Expect(gg.IfZero(v, orElse)).To(Equal(expected))
-		},
-		Entry("zero value", 0, 2, 2),
-		Entry("non-zero value", -1, 2, -1),
-	)
-	type testStruct struct {
-		field1 int
-	}
-	DescribeTable("struct",
-		func(v, orElse, expected testStruct) {
-			Expect(gg.IfZero(v, orElse)).To(Equal(expected))
-		},
-		Entry("zero value", testStruct{}, testStruct{123}, testStruct{123}),
-		Entry("non-zero value", testStruct{456}, testStruct{123}, testStruct{456}),
-	)
+var _ = Describe("GG", func() {
+	Describe("If", func() {
+		DescribeTable("string",
+			func(v, orElse, expected string) {
+				Expect(gg.If(v, orElse)).To(Equal(expected))
+			},
+			Entry("zero value", "", "default", "default"),
+			Entry("non-zero value", "anything", "default", "anything"),
+		)
+		DescribeTable("numeric",
+			func(v, orElse, expected int) {
+				Expect(gg.If(v, orElse)).To(Equal(expected))
+			},
+			Entry("zero value", 0, 2, 2),
+			Entry("non-zero value", -1, 2, -1),
+		)
+		type testStruct struct {
+			field1 int
+		}
+		DescribeTable("struct",
+			func(v, orElse, expected testStruct) {
+				Expect(gg.If(v, orElse)).To(Equal(expected))
+			},
+			Entry("zero value", testStruct{}, testStruct{123}, testStruct{123}),
+			Entry("non-zero value", testStruct{456}, testStruct{123}, testStruct{456}),
+		)
+	})
+
+	Describe("FirstOr", func() {
+		Context("when given a list of strings", func() {
+			It("returns the first non-empty value", func() {
+				Expect(gg.FirstOr("default", "foo", "bar", "baz")).To(Equal("foo"))
+				Expect(gg.FirstOr("default", "", "", "qux")).To(Equal("qux"))
+			})
+
+			It("returns the default value if all values are empty", func() {
+				Expect(gg.FirstOr("default", "", "", "")).To(Equal("default"))
+				Expect(gg.FirstOr("", "", "", "")).To(Equal(""))
+			})
+		})
+	})
 })