Read every setting through viper (closes #211)

servewaf's and rproxy's settings are read through viper, bound to the same environment variable names as before, in place of the os.LookupEnv function Main passed down. NewViper turns AutomaticEnv and AllowEmptyEnv on, so a setting that is set but empty reads as set, as it did. The _FILE forms, their errors, and rproxy reading no file form are unchanged, and the settings tests pass set into a viper instead of a lookup function.

Model: deepseek-v4-pro

internal/config/config.go

@@ -26,6 +26,8 @@ import (
 	"unicode"
 	"unicode/utf8"
 
+	"github.com/spf13/viper"
+
 	"sneak.berlin/go/smallwebwaf/internal/alerts"
 	"sneak.berlin/go/smallwebwaf/internal/anomaly"
 	"sneak.berlin/go/smallwebwaf/internal/remotelog"
@@ -450,15 +452,16 @@ var (
 		"is in SWWAF_BLOCKLIST_URLS or is SWWAF_ASN_LIMIT_PERCENT_URL too")
 )
 
-// FromEnvironment reads the settings with lookupEnv, normally
-// os.LookupEnv. A setting may instead be given as a file: the variable
-// named by the setting's name with _FILE added names the file, which is
-// read now (see lookup). A setting that is not set takes its default. A
-// setting that is set but invalid is an error that names it.
+// FromEnvironment reads the settings through v, normally the viper
+// NewViper returns, bound to the process's environment. A setting may
+// instead be given as a file: the variable named by the setting's name
+// with _FILE added names the file, which is read now (see lookup). A
+// setting that is not set takes its default. A setting that is set but
+// invalid is an error that names it.
 //
 //nolint:funlen // one line for each setting, a list that grows with them
-func FromEnvironment(lookupEnv func(string) (string, bool)) (*Config, error) {
-	env := &environment{lookupEnv: lookupEnv}
+func FromEnvironment(v *viper.Viper) (*Config, error) {
+	env := &environment{v: v, readFiles: true}
 	cfg := &Config{
 		ListenAddr:           env.address("SWWAF_LISTEN_ADDR"),
 		InstanceName:         env.instanceName(),
@@ -575,8 +578,8 @@ func FromEnvironment(lookupEnv func(string) (string, bool)) (*Config, error) {
 // Command reads only SMALLWEBWAF_COMMAND, the command the image runs and its
 // health check checks: rproxy when it is unset or empty, or servewaf. It cannot
 // be given as a file. Any other value is an error that names the setting.
-func Command(lookupEnv func(string) (string, bool)) (string, error) {
-	command, _ := lookupEnv("SMALLWEBWAF_COMMAND")
+func Command(v *viper.Viper) (string, error) {
+	command, _ := readSetting(v, "SMALLWEBWAF_COMMAND")
 
 	switch command {
 	case "", "rproxy":
@@ -591,8 +594,8 @@ func Command(lookupEnv func(string) (string, bool)) (string, error) {
 // ServeWAFListenAddr reads only SWWAF_LISTEN_ADDR, which may be given as a
 // file, as FromEnvironment does. The health check in servewaf's container needs
 // no other setting, so it reads no other, nor a file that another names.
-func ServeWAFListenAddr(lookupEnv func(string) (string, bool)) (string, error) {
-	env := &environment{lookupEnv: lookupEnv}
+func ServeWAFListenAddr(v *viper.Viper) (string, error) {
+	env := &environment{v: v, readFiles: true}
 	listenAddr := env.address("SWWAF_LISTEN_ADDR")
 
 	return listenAddr, env.err
@@ -602,8 +605,8 @@ func ServeWAFListenAddr(lookupEnv func(string) (string, bool)) (string, error) {
 // file, as FromEnvironment does, so that the line saying a setting is
 // invalid carries it too. A file that cannot be read gives the default
 // here, and FromEnvironment then stops the start over it.
-func InstanceName(lookupEnv func(string) (string, bool)) string {
-	env := &environment{lookupEnv: lookupEnv}
+func InstanceName(v *viper.Viper) string {
+	env := &environment{v: v, readFiles: true}
 
 	return env.instanceName()
 }
@@ -619,13 +622,26 @@ func (c *Config) LogValue() slog.Value {
 }
 
 // environment is where FromEnvironment reads the settings: it notes each
-// value for the log, and keeps the first error.
+// value for the log, and keeps the first error. It reads every setting
+// through v, the viper NewViper returns, and, unless readFiles is false,
+// honours each setting's _FILE form too.
 type environment struct {
-	lookupEnv func(string) (string, bool)
+	v         *viper.Viper
+	readFiles bool
 	settings  []slog.Attr
 	err       error
 }
 
+// readSetting returns a setting's value and whether it is set, reading it
+// through v.
+func readSetting(v *viper.Viper, name string) (string, bool) {
+	if !v.IsSet(name) {
+		return "", false
+	}
+
+	return v.GetString(name), true
+}
+
 // value returns a setting's value, or its default when it is not set,
 // and notes it for the log.
 func (e *environment) value(name, defaultValue string) string {
@@ -644,10 +660,14 @@ func (e *environment) value(name, defaultValue string) string {
 // names, less one newline at their end. It notes that file's path for the
 // log. Both variables set, or a file that cannot be read, is an error.
 func (e *environment) lookup(name string) (string, bool) {
-	value, set := e.lookupEnv(name)
+	value, set := readSetting(e.v, name)
+	if !e.readFiles {
+		return value, set
+	}
+
 	fileName := name + "_FILE"
 
-	path, inFile := e.lookupEnv(fileName)
+	path, inFile := readSetting(e.v, fileName)
 	if !inFile {
 		return value, set
 	}
@@ -1193,7 +1213,7 @@ func (e *environment) logRemoteURL(name string) *url.URL {
 // certificates. Unset or empty, it is nil. Its value names a file
 // already, so, unlike the other settings, it has no _FILE form.
 func (e *environment) certificates(name string) *x509.CertPool {
-	path, _ := e.lookupEnv(name)
+	path, _ := readSetting(e.v, name)
 	e.settings = append(e.settings, slog.String(name, path))
 
 	if path == "" {

internal/config/config_test.go

@@ -17,6 +17,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/spf13/viper"
+
 	"sneak.berlin/go/smallwebwaf/internal/anomaly"
 	"sneak.berlin/go/smallwebwaf/internal/config"
 )
@@ -217,18 +219,22 @@ const (
 // environment is a set of environment variables, for FromEnvironment.
 type environment map[string]string
 
-// lookupEnv reads one of the variables, as os.LookupEnv does.
-func (e environment) lookupEnv(name string) (string, bool) {
-	value, ok := e[name]
+// viper returns a viper Set with each of the variables, as the viper
+// NewViper returns one bound to a process's environment.
+func (e environment) viper() *viper.Viper {
+	v := viper.New()
+	for name, value := range e {
+		v.Set(name, value)
+	}
 
-	return value, ok
+	return v
 }
 
 // fromEnvironment reads the settings from env, which must be valid.
 func fromEnvironment(t *testing.T, env environment) *config.Config {
 	t.Helper()
 
-	cfg, err := config.FromEnvironment(env.lookupEnv)
+	cfg, err := config.FromEnvironment(env.viper())
 	if err != nil {
 		t.Fatalf("settings %v: %v", env, err)
 	}
@@ -455,7 +461,7 @@ func TestPathPrefixNotStartingWithSlashStopsTheStart(t *testing.T) {
 	t.Parallel()
 
 	_, err := config.FromEnvironment(
-		environment{rateLimitExemptPaths: "/favicon.ico,assets/"}.lookupEnv)
+		environment{rateLimitExemptPaths: "/favicon.ico,assets/"}.viper())
 
 	want := rateLimitExemptPaths + `: "assets/" is not a path prefix ` +
 		`starting with /, such as /assets/`
@@ -510,7 +516,7 @@ func TestInvalidTrapPathOrErrorBurstThresholdStopsTheStart(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -636,7 +642,7 @@ func TestInvalidCoreRuleSetSettingStopsTheStart(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -761,7 +767,7 @@ func TestInvalidRemoteLogSettingStopsTheStart(t *testing.T) {
 		{logRemoteAppName, ""}, {logRemoteAppName, "my app"},
 		{logRemoteAppName, "gitéa"}, {logRemoteAppName, strings.Repeat("a", 49)},
 	} {
-		_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+		_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 		if err == nil || !strings.HasPrefix(err.Error(), tc.name+": ") {
 			t.Errorf("%s=%q: error %v, want one naming it", tc.name, tc.value, err)
 		}
@@ -778,7 +784,7 @@ func TestRemoteLogCAFileWithoutCertificateStopsTheStart(t *testing.T) {
 		t.Fatalf("write %s: %v", caFile, err)
 	}
 
-	_, err = config.FromEnvironment(environment{logRemoteTLSCAFile: caFile}.lookupEnv)
+	_, err = config.FromEnvironment(environment{logRemoteTLSCAFile: caFile}.viper())
 
 	want := logRemoteTLSCAFile + `: "` + caFile + `" holds no PEM certificate`
 	if err == nil || err.Error() != want {
@@ -793,7 +799,7 @@ func TestInstanceNameNotAnAppNameStopsTheStartOnlyWhileSending(t *testing.T) {
 
 	sending := environment{logRemoteURL: remoteURL, instanceName: spaced}
 
-	_, err := config.FromEnvironment(sending.lookupEnv)
+	_, err := config.FromEnvironment(sending.viper())
 
 	want := logRemoteAppName + `: is unset, and ` + instanceName +
 		` "fsn1 app1", its default, is not 1 to 48 printable ASCII characters ` +
@@ -823,7 +829,7 @@ func TestAppNameSetStopsTheStartWhileSending(t *testing.T) {
 		logRemoteURL:     remoteURL,
 		instanceName:     instance,
 		logRemoteAppName: "my app",
-	}.lookupEnv)
+	}.viper())
 
 	want := logRemoteAppName + `: "my app" is not 1 to 48 printable ASCII ` +
 		`characters without a space, such as gitea`
@@ -954,7 +960,7 @@ func TestWebhookHeadersAreLoggedMaskedAndNeverShown(t *testing.T) {
 	// An item that is not a header is named by its place, not shown.
 	_, err := config.FromEnvironment(environment{
 		alertWebhookHeaders: "X-Team:ops," + secret,
-	}.lookupEnv)
+	}.viper())
 
 	want := alertWebhookHeaders + ": item 2 is not a header name followed by : " +
 		"and the header's value, such as Authorization:Bearer <token>"
@@ -991,7 +997,7 @@ func TestWebhookURLIsLoggedWithoutItsPathOrQueryAndNeverShown(t *testing.T) {
 		"ftp://hooks.example/services/" + secret,
 		"https://hooks.example/services/%zz" + secret,
 	} {
-		_, err := config.FromEnvironment(environment{alertWebhookURL: value}.lookupEnv)
+		_, err := config.FromEnvironment(environment{alertWebhookURL: value}.viper())
 
 		want := alertWebhookURL + ": is not an http or https URL without a user or " +
 			"a fragment, such as https://alerts.example/smallwebwaf"
@@ -1042,7 +1048,7 @@ func TestNtfyTokenWithAControlCharacterStopsTheStartWithoutShowingIt(t *testing.
 		"set":       {alertNtfyToken: token + "\r"},
 		"in a file": {alertNtfyToken + "_FILE": writeFile(t, token+"\r\n")},
 	} {
-		_, err := config.FromEnvironment(env.lookupEnv)
+		_, err := config.FromEnvironment(env.viper())
 
 		want := alertNtfyToken + ": holds a control character, such as the " +
 			"carriage return of a Windows line end"
@@ -1059,7 +1065,7 @@ func TestInstanceNameWithAControlCharacterStopsTheStartOnlyWithNtfySet(t *testin
 
 	_, err := config.FromEnvironment(environment{
 		instanceName: name, alertNtfyURL: "https://ntfy.example/smallwebwaf-alerts",
-	}.lookupEnv)
+	}.viper())
 
 	want := instanceName + `: "fsn1app1\r" holds a control character, such as the ` +
 		`carriage return of a Windows line end, and is sent to ntfy in a header ` +
@@ -1084,7 +1090,7 @@ func TestInstanceNameNotUTF8StopsTheStart(t *testing.T) {
 		"set":       {instanceName: latin1},
 		"in a file": {instanceName + "_FILE": writeFile(t, latin1+"\n")},
 	} {
-		_, err := config.FromEnvironment(env.lookupEnv)
+		_, err := config.FromEnvironment(env.viper())
 
 		want := instanceName + `: "caf\xe9" is not valid UTF-8`
 		if err == nil || err.Error() != want {
@@ -1099,7 +1105,7 @@ func TestCodeOnBothCountryListsStopsTheStart(t *testing.T) {
 	_, err := config.FromEnvironment(environment{
 		deniedCountries:  "cn,ru",
 		allowedCountries: "de,RU",
-	}.lookupEnv)
+	}.viper())
 	if err == nil {
 		t.Fatal("ru on both country lists was accepted")
 	}
@@ -1161,7 +1167,7 @@ func TestLookupDBPathGoesWithTheFileSourceAlone(t *testing.T) {
 			lookupDBPath + ": is set while " + lookupSource + " is off; only file reads it",
 		},
 	} {
-		_, err := config.FromEnvironment(tc.env.lookupEnv)
+		_, err := config.FromEnvironment(tc.env.viper())
 		if err == nil || err.Error() != tc.want {
 			t.Errorf("settings %v: error %v, want %s", tc.env, err, tc.want)
 		}
@@ -1191,7 +1197,7 @@ func TestSettingNeedingLookupsStopsTheStartWhileTheyAreOff(t *testing.T) {
 
 			_, err := config.FromEnvironment(environment{
 				lookupSource: off, name: value,
-			}.lookupEnv)
+			}.viper())
 			if err == nil || !strings.HasPrefix(err.Error(), name+": ") ||
 				!strings.Contains(err.Error(), lookupSource+" is off") {
 				t.Errorf("error %v, want one naming %s and %s", err, name, lookupSource)
@@ -1341,7 +1347,7 @@ func TestInvalidAnomalySettingStopsTheStartSayingWhatIsWrong(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -1420,7 +1426,7 @@ func TestInvalidBiasedThresholdStopsTheStartSayingWhatIsWrong(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -1517,7 +1523,7 @@ func TestInvalidReputationSettingStopsTheStartSayingWhatIsWrong(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -1532,7 +1538,7 @@ func TestASNLimitPercentURLThatIsABlocklistStopsTheStart(t *testing.T) {
 
 	_, err := config.FromEnvironment(environment{
 		blocklistURLs: dropURL + "," + asnURL, asnLimitPercentURL: asnURL,
-	}.lookupEnv)
+	}.viper())
 
 	want := asnLimitPercentURL + `: "` + asnURL + `" is in SWWAF_BLOCKLIST_URLS too`
 	if err == nil || err.Error() != want {
@@ -1659,7 +1665,7 @@ func TestInvalidDNSBLSettingStopsTheStartSayingWhatIsWrong(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -1727,7 +1733,7 @@ func TestDNSBLZoneKeyIsLoggedMaskedAndNeverShown(t *testing.T) {
 		{spamhaus + "," + otherZone, `"` + spamhausMasked + `" is listed twice`},
 		{spamhaus + ",,", "has an empty item in its list"},
 	} {
-		_, err := config.FromEnvironment(environment{dnsblZones: tc.value}.lookupEnv)
+		_, err := config.FromEnvironment(environment{dnsblZones: tc.value}.viper())
 
 		want := dnsblZones + ": " + tc.want
 		if err == nil || err.Error() != want {
@@ -1780,7 +1786,7 @@ func TestInvalidAbuseIPDBSettingStopsTheStartSayingWhatIsWrong(t *testing.T) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 
 			want := tc.name + ": " + tc.want
 			if err == nil || err.Error() != want {
@@ -1894,7 +1900,7 @@ func TestInvalidCrowdSecSettingStopsTheStartSayingWhatIsWrong(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(tc.env.lookupEnv)
+			_, err := config.FromEnvironment(tc.env.viper())
 			if err == nil || err.Error() != tc.want {
 				t.Errorf("error %v, want %s", err, tc.want)
 			}
@@ -2054,7 +2060,7 @@ func wantStartStopped(t *testing.T, invalid []struct{ name, value string }) {
 		t.Run(tc.name+"="+tc.value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{tc.name: tc.value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{tc.name: tc.value}.viper())
 			if err == nil {
 				t.Fatalf("%s=%q was accepted", tc.name, tc.value)
 			}
@@ -2079,7 +2085,7 @@ func TestHostOrTransferEncodingStopsTheStart(t *testing.T) {
 		t.Run(value, func(t *testing.T) {
 			t.Parallel()
 
-			_, err := config.FromEnvironment(environment{logRequestHeaders: value}.lookupEnv)
+			_, err := config.FromEnvironment(environment{logRequestHeaders: value}.viper())
 			if err == nil || err.Error() != logRequestHeaders+": "+want {
 				t.Errorf("error %v, want %s: %s", err, logRequestHeaders, want)
 			}
@@ -2096,7 +2102,7 @@ func TestShortTokenStopsTheStartWithoutShowingIt(t *testing.T) {
 			t.Run(name+"="+value, func(t *testing.T) {
 				t.Parallel()
 
-				_, err := config.FromEnvironment(environment{name: value}.lookupEnv)
+				_, err := config.FromEnvironment(environment{name: value}.viper())
 
 				want := name + ": is shorter than 32 characters"
 				if err == nil || err.Error() != want {
@@ -2152,7 +2158,7 @@ func TestSettingFromFileIsCheckedAsTheSettingItself(t *testing.T) {
 
 	_, err := config.FromEnvironment(environment{
 		bytesLimitPerMinute + "_FILE": writeFile(t, "lots\n"),
-	}.lookupEnv)
+	}.viper())
 
 	want := bytesLimitPerMinute + `: "lots" is not a size such as 512K, 100M or 5G, or off`
 	if err == nil || err.Error() != want {
@@ -2163,7 +2169,7 @@ func TestSettingFromFileIsCheckedAsTheSettingItself(t *testing.T) {
 		logRemoteURL:               remoteURL,
 		instanceName:               instance,
 		logRemoteAppName + "_FILE": writeFile(t, "my app\n"),
-	}.lookupEnv)
+	}.viper())
 
 	want = logRemoteAppName + `: "my app" is not 1 to 48 printable ASCII ` +
 		`characters without a space, such as gitea`
@@ -2178,7 +2184,7 @@ func TestSettingAndItsFileBothSetStopsTheStart(t *testing.T) {
 	_, err := config.FromEnvironment(environment{
 		metricsToken:           token,
 		metricsToken + "_FILE": writeFile(t, token),
-	}.lookupEnv)
+	}.viper())
 
 	want := metricsToken + ": is set, and so is " + metricsToken +
 		"_FILE; set only one of them"
@@ -2193,7 +2199,7 @@ func TestUnreadableSettingFileStopsTheStart(t *testing.T) {
 	dir := t.TempDir()
 
 	for _, path := range []string{filepath.Join(dir, "missing"), dir} {
-		_, err := config.FromEnvironment(environment{metricsToken + "_FILE": path}.lookupEnv)
+		_, err := config.FromEnvironment(environment{metricsToken + "_FILE": path}.viper())
 
 		want := metricsToken + "_FILE: cannot be read: "
 		if err == nil || !strings.HasPrefix(err.Error(), want) {

internal/config/rproxy.go

@@ -8,8 +8,9 @@ import (
 	"net/netip"
 	"net/url"
 	"strconv"
-	"strings"
 	"time"
+
+	"github.com/spf13/viper"
 )
 
 // RProxy is the settings of `smallwebwaf rproxy`. A size or time limit of zero
@@ -58,13 +59,13 @@ var (
 		"is not a whole number of milliseconds above zero, such as 60000, or off")
 )
 
-// RProxyFromEnvironment reads rproxy's settings with lookupEnv, normally
-// os.LookupEnv. A setting that is not set takes its default, and
-// SWRP_WAF_BACKEND, which has none, must be set. A setting that is set but
-// invalid is an error that names it. Since rproxy never touches disk, its
-// settings have no _FILE form.
-func RProxyFromEnvironment(lookupEnv func(string) (string, bool)) (*RProxy, error) {
-	env := &environment{lookupEnv: withoutFileForms(lookupEnv)}
+// RProxyFromEnvironment reads rproxy's settings through v, normally the viper
+// NewViper returns, bound to the process's environment. A setting that is not
+// set takes its default, and SWRP_WAF_BACKEND, which has none, must be set. A
+// setting that is set but invalid is an error that names it. Since rproxy
+// never touches disk, its settings have no _FILE form.
+func RProxyFromEnvironment(v *viper.Viper) (*RProxy, error) {
+	env := &environment{v: v, readFiles: false}
 	cfg := &RProxy{
 		ListenAddr:         env.address("SWRP_LISTEN_ADDR"),
 		UpstreamURL:        env.appURL("SWRP_UPSTREAM_URL", defaultUpstreamURL),
@@ -91,9 +92,9 @@ func RProxyFromEnvironment(lookupEnv func(string) (string, bool)) (*RProxy, erro
 // SWRP_UPSTREAM_URL. The health check in rproxy's container needs no other
 // setting, so it reads no other.
 func RProxyListenAddrAndUpstreamURL(
-	lookupEnv func(string) (string, bool),
+	v *viper.Viper,
 ) (string, *url.URL, error) {
-	env := &environment{lookupEnv: withoutFileForms(lookupEnv)}
+	env := &environment{v: v, readFiles: false}
 	listenAddr := env.address("SWRP_LISTEN_ADDR")
 	upstreamURL := env.appURL("SWRP_UPSTREAM_URL", defaultUpstreamURL)
 
@@ -104,20 +105,6 @@ func RProxyListenAddrAndUpstreamURL(
 	return listenAddr, upstreamURL, nil
 }
 
-// withoutFileForms returns lookupEnv finding no setting named with _FILE, since
-// rproxy never touches disk.
-func withoutFileForms(
-	lookupEnv func(string) (string, bool),
-) func(string) (string, bool) {
-	return func(name string) (string, bool) {
-		if strings.HasSuffix(name, "_FILE") {
-			return "", false
-		}
-
-		return lookupEnv(name)
-	}
-}
-
 // LogValue makes an RProxy log as each setting's name with the value it was
 // given, or its default.
 func (c *RProxy) LogValue() slog.Value {

internal/config/rproxy_test.go

@@ -9,6 +9,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/spf13/viper"
+
 	"sneak.berlin/go/smallwebwaf/internal/config"
 )
 
@@ -32,11 +34,12 @@ const (
 
 // rproxyConfig reads rproxy's settings from env.
 func rproxyConfig(env map[string]string) (*config.RProxy, error) {
-	return config.RProxyFromEnvironment(func(name string) (string, bool) {
-		value, ok := env[name]
+	v := viper.New()
+	for name, value := range env {
+		v.Set(name, value)
+	}
 
-		return value, ok
-	})
+	return config.RProxyFromEnvironment(v)
 }
 
 func TestRProxyDefaults(t *testing.T) {

internal/config/viper.go

@@ -0,0 +1,16 @@
+package config
+
+import "github.com/spf13/viper"
+
+// NewViper returns the viper that reads the settings: each setting's
+// environment variable, bound to its own name. Every setting of servewaf and
+// rproxy is read through it, and none is read with os.Getenv or os.LookupEnv
+// outside it. An environment variable that is set but empty is set, as one
+// that holds a value is, which viper does not take for granted.
+func NewViper() *viper.Viper {
+	v := viper.New()
+	v.AutomaticEnv()
+	v.AllowEmptyEnv(true)
+
+	return v
+}