Format go code

Co-authored-by: @algernon

README.md

@@ -80,7 +80,9 @@ and especially have a look at [this section of the haproxy.cfg](https://codeberg
 - `ENABLE_HTTP_SERVER` (default: false): Set this to true to enable the HTTP-01 challenge and redirect all other HTTP requests to HTTPS. Currently only works with port 80.
 - `DNS_PROVIDER` (default: use self-signed certificate): Code of the ACME DNS provider for the main domain wildcard.  
   See <https://go-acme.github.io/lego/dns/> for available values & additional environment variables.
+- `NO_DNS_01` (default: `false`): Disable the use of ACME DNS. This means that the wildcard certificate is self-signed and all domains and subdomains will have a distinct certificate. Because this may lead to a rate limit from the ACME provider, this option is not recommended for Gitea/Forgejo instances with open registrations or a great number of users/orgs.
 - `LOG_LEVEL` (default: warn): Set this to specify the level of logging.
+- `REDIS_URL` (default: use in-memory cache): Set this to use Redis as a cache server.
 
 ## Contributing to the development
 

cli/flags.go

@@ -126,6 +126,13 @@ var (
 			EnvVars: []string{"BLACKLISTED_PATHS"},
 		},
 
+		&cli.StringFlag{
+			Name:    "redis-url",
+			Value:   "",
+			Usage:   "use redis instead of the built-in memory cache (recommended)",
+			EnvVars: []string{"REDIS_URL"},
+		},
+
 		&cli.StringFlag{
 			Name:    "log-level",
 			Value:   "warn",
@@ -178,6 +185,11 @@ var (
 			Usage:   "Use DNS-Challenge for main domain. Read more at: https://go-acme.github.io/lego/dns/",
 			EnvVars: []string{"DNS_PROVIDER"},
 		},
+		&cli.BoolFlag{
+			Name:    "no-dns-01",
+			Usage:   "Always use individual certificates instead of a DNS-01 wild card certificate",
+			EnvVars: []string{"NO_DNS_01"},
+		},
 		&cli.StringFlag{
 			Name:    "acme-account-config",
 			Usage:   "json file of acme account",

config/config.go

@@ -6,6 +6,7 @@ type Config struct {
 	Gitea    GiteaConfig
 	Database DatabaseConfig
 	ACME     ACMEConfig
+	Cache    CacheConfig
 }
 
 type ServerConfig struct {
@@ -42,5 +43,10 @@ type ACMEConfig struct {
 	EAB_HMAC          string
 	EAB_KID           string
 	DNSProvider       string
+	NoDNS01           bool   `default:"false"`
 	AccountConfigFile string `default:"acme-account.json"`
 }
+
+type CacheConfig struct {
+	RedisURL string `default:""`
+}

config/setup.go

@@ -54,6 +54,7 @@ func MergeConfig(ctx *cli.Context, config *Config) {
 	mergeGiteaConfig(ctx, &config.Gitea)
 	mergeDatabaseConfig(ctx, &config.Database)
 	mergeACMEConfig(ctx, &config.ACME)
+	mergeCacheConfig(ctx, &config.Cache)
 }
 
 func mergeServerConfig(ctx *cli.Context, config *ServerConfig) {
@@ -141,7 +142,16 @@ func mergeACMEConfig(ctx *cli.Context, config *ACMEConfig) {
 	if ctx.IsSet("dns-provider") {
 		config.DNSProvider = ctx.String("dns-provider")
 	}
+	if ctx.IsSet("no-dns-01") {
+		config.NoDNS01 = ctx.Bool("no-dns-01")
+	}
 	if ctx.IsSet("acme-account-config") {
 		config.AccountConfigFile = ctx.String("acme-account-config")
 	}
 }
+
+func mergeCacheConfig(ctx *cli.Context, config *CacheConfig) {
+	if ctx.IsSet("redis-url") {
+		config.RedisURL = ctx.String("redis-url")
+	}
+}

config/setup_test.go

@@ -166,6 +166,7 @@ func TestMergeConfigShouldReplaceAllExistingValuesGivenAllArgsExist(t *testing.T
 					EAB_HMAC:          "original",
 					EAB_KID:           "original",
 					DNSProvider:       "original",
+					NoDNS01:           false,
 					AccountConfigFile: "original",
 				},
 			}
@@ -205,6 +206,7 @@ func TestMergeConfigShouldReplaceAllExistingValuesGivenAllArgsExist(t *testing.T
 					EAB_HMAC:          "changed",
 					EAB_KID:           "changed",
 					DNSProvider:       "changed",
+					NoDNS01:           true,
 					AccountConfigFile: "changed",
 				},
 			}
@@ -243,6 +245,7 @@ func TestMergeConfigShouldReplaceAllExistingValuesGivenAllArgsExist(t *testing.T
 			"--acme-eab-hmac", "changed",
 			"--acme-eab-kid", "changed",
 			"--dns-provider", "changed",
+			"--no-dns-01",
 			"--acme-account-config", "changed",
 		},
 	)
@@ -517,6 +520,7 @@ func TestMergeACMEConfigShouldReplaceAllExistingValuesGivenAllArgsExist(t *testi
 				EAB_HMAC:          "original",
 				EAB_KID:           "original",
 				DNSProvider:       "original",
+				NoDNS01:           false,
 				AccountConfigFile: "original",
 			}
 
@@ -530,6 +534,7 @@ func TestMergeACMEConfigShouldReplaceAllExistingValuesGivenAllArgsExist(t *testi
 				EAB_HMAC:          "changed",
 				EAB_KID:           "changed",
 				DNSProvider:       "changed",
+				NoDNS01:           true,
 				AccountConfigFile: "changed",
 			}
 
@@ -545,6 +550,7 @@ func TestMergeACMEConfigShouldReplaceAllExistingValuesGivenAllArgsExist(t *testi
 			"--acme-eab-hmac", "changed",
 			"--acme-eab-kid", "changed",
 			"--dns-provider", "changed",
+			"--no-dns-01",
 			"--acme-account-config", "changed",
 		},
 	)
@@ -563,6 +569,7 @@ func TestMergeACMEConfigShouldReplaceOnlyOneValueExistingValueGivenOnlyOneArgExi
 		{args: []string{"--acme-eab-hmac", "changed"}, callback: func(gc *ACMEConfig) { gc.EAB_HMAC = "changed" }},
 		{args: []string{"--acme-eab-kid", "changed"}, callback: func(gc *ACMEConfig) { gc.EAB_KID = "changed" }},
 		{args: []string{"--dns-provider", "changed"}, callback: func(gc *ACMEConfig) { gc.DNSProvider = "changed" }},
+		{args: []string{"--no-dns-01"}, callback: func(gc *ACMEConfig) { gc.NoDNS01 = true }},
 		{args: []string{"--acme-account-config", "changed"}, callback: func(gc *ACMEConfig) { gc.AccountConfigFile = "changed" }},
 	}
 

go.mod

@@ -7,6 +7,7 @@ toolchain go1.21.4
 require (
 	code.gitea.io/sdk/gitea v0.16.1-0.20231115014337-e23e8aa3004f
 	github.com/OrlovEvgeny/go-mcache v0.0.0-20200121124330-1a8195b34f3a
+	github.com/creasty/defaults v1.7.0
 	github.com/go-acme/lego/v4 v4.5.3
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/joho/godotenv v1.4.0
@@ -14,6 +15,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.16
 	github.com/microcosm-cc/bluemonday v1.0.26
 	github.com/pelletier/go-toml/v2 v2.1.0
+	github.com/redis/go-redis/v9 v9.5.1
 	github.com/reugn/equalizer v0.0.0-20210216135016-a959c509d7ad
 	github.com/rs/zerolog v1.27.0
 	github.com/stretchr/testify v1.8.4
@@ -42,13 +44,14 @@ require (
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc // indirect
 	github.com/cenkalti/backoff/v4 v4.1.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/cloudflare/cloudflare-go v0.20.0 // indirect
 	github.com/cpu/goacmedns v0.1.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
-	github.com/creasty/defaults v1.7.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/davidmz/go-pageant v1.0.2 // indirect
 	github.com/deepmap/oapi-codegen v1.6.1 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/dimchansky/utfbom v1.1.1 // indirect
 	github.com/dnsimple/dnsimple-go v0.70.1 // indirect
 	github.com/exoscale/egoscale v0.67.0 // indirect

go.sum

@@ -97,6 +97,10 @@ github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kB
 github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
 github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc h1:biVzkmvwrH8WK8raXaxBx6fRVTlJILwEwQGL1I/ByEI=
 github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
 github.com/c-bata/go-prompt v0.2.5/go.mod h1:vFnjEGDIIA/Lib7giyE4E9c50Lvl8j0S+7FVlAwDAVw=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
@@ -105,6 +109,8 @@ github.com/cenkalti/backoff/v4 v4.1.1/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInq
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
@@ -143,6 +149,8 @@ github.com/deepmap/oapi-codegen v1.6.1 h1:2BvsmRb6pogGNtr8Ann+esAbSKFXx2CZN18VpA
 github.com/deepmap/oapi-codegen v1.6.1/go.mod h1:ryDa9AgbELGeB+YEXE1dR53yAjHwFvE9iAUlWl9Al3M=
 github.com/denisenkom/go-mssqldb v0.10.0/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/dimchansky/utfbom v1.1.0/go.mod h1:rO41eb7gLfo8SF1jd9F8HplJm1Fewwi4mQvIirEdv+8=
 github.com/dimchansky/utfbom v1.1.1 h1:vV6w1AhK4VMnhBno/TPVCoK9U/LP0PkLCS9tbxHdi/U=
@@ -615,6 +623,8 @@ github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+Gx
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/rainycape/memcache v0.0.0-20150622160815-1031fa0ce2f2/go.mod h1:7tZKcyumwBO6qip7RNQ5r77yrssm9bfCowcLEBcU5IA=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
+github.com/redis/go-redis/v9 v9.5.1 h1:H1X4D3yHPaYrkL5X06Wh6xNVM/pX0Ft4RV0vMGvLBh8=
+github.com/redis/go-redis/v9 v9.5.1/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 h1:OdAsTTz6OkFY5QxjkYwrChwuRruF69c169dPK26NUlk=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/reugn/equalizer v0.0.0-20210216135016-a959c509d7ad h1:WtSUHi5zthjudjIi3L6QmL/V9vpJPbc/j/F2u55d3fs=

server/acme/client.go

@@ -13,8 +13,8 @@ var ErrAcmeMissConfig = errors.New("ACME client has wrong config")
 
 func CreateAcmeClient(cfg config.ACMEConfig, enableHTTPServer bool, challengeCache cache.ICache) (*certificates.AcmeClient, error) {
 	// check config
-	if (!cfg.AcceptTerms || cfg.DNSProvider == "") && cfg.APIEndpoint != "https://acme.mock.directory" {
-		return nil, fmt.Errorf("%w: you must set $ACME_ACCEPT_TERMS and $DNS_PROVIDER, unless $ACME_API is set to https://acme.mock.directory", ErrAcmeMissConfig)
+	if (!cfg.AcceptTerms || (cfg.DNSProvider == "" && !cfg.NoDNS01)) && cfg.APIEndpoint != "https://acme.mock.directory" {
+		return nil, fmt.Errorf("%w: you must set $ACME_ACCEPT_TERMS and $DNS_PROVIDER or $NO_DNS_01, unless $ACME_API is set to https://acme.mock.directory", ErrAcmeMissConfig)
 	}
 	if cfg.EAB_HMAC != "" && cfg.EAB_KID == "" {
 		return nil, fmt.Errorf("%w: ACME_EAB_HMAC also needs ACME_EAB_KID to be set", ErrAcmeMissConfig)

server/cache/interface.go

@@ -4,7 +4,7 @@ import "time"
 
 // ICache is an interface that defines how the pages server interacts with the cache.
 type ICache interface {
-	Set(key string, value interface{}, ttl time.Duration) error
-	Get(key string) (interface{}, bool)
+	Set(key string, value []byte, ttl time.Duration) error
+	Get(key string) ([]byte, bool)
 	Remove(key string)
 }

server/cache/memory.go

@@ -1,7 +1,32 @@
 package cache
 
-import "github.com/OrlovEvgeny/go-mcache"
+import (
+	"time"
+
+	"github.com/OrlovEvgeny/go-mcache"
+)
+
+type MCache struct {
+	mcache *mcache.CacheDriver
+}
+
+func (m *MCache) Set(key string, value []byte, ttl time.Duration) error {
+	return m.mcache.Set(key, value, ttl)
+}
+
+func (m *MCache) Get(key string) ([]byte, bool) {
+	val, ok := m.mcache.Get(key)
+	if ok {
+		return val.([]byte), true
+	} else {
+		return nil, false
+	}
+}
+
+func (m *MCache) Remove(key string) {
+	m.mcache.Remove(key)
+}
 
 func NewInMemoryCache() ICache {
-	return mcache.New()
+	return &MCache{mcache.New()}
 }

server/cache/redis.go

@@ -0,0 +1,51 @@
+package cache
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+	"github.com/rs/zerolog/log"
+)
+
+type RedisCache struct {
+	name string
+	ctx  context.Context
+	rdb  *redis.Client
+}
+
+func (r *RedisCache) Set(key string, value []byte, ttl time.Duration) error {
+	log.Trace().Str("key", r.name+"::"+key).Int("len(value)", len(value)).Bytes("value", value).Msg("Set in Redis.")
+	return r.rdb.Set(r.ctx, r.name+"::"+key, value, ttl).Err()
+}
+
+func (r *RedisCache) Get(key string) ([]byte, bool) {
+	val, err := r.rdb.Get(r.ctx, r.name+"::"+key).Bytes()
+	if err != nil {
+		if !errors.Is(err, redis.Nil) {
+			log.Error().Err(err).Str("key", r.name+"::"+key).Msg("Couldn't request key from cache.")
+		} else {
+			log.Trace().Str("key", r.name+"::"+key).Msg("Get from Redis, doesn't exist.")
+		}
+		return nil, false
+	} else {
+		log.Trace().Str("key", r.name+"::"+key).Int("len(value)", len(val)).Msg("Get from Redis.")
+		return val, true
+	}
+}
+
+func (r *RedisCache) Remove(key string) {
+	err := r.rdb.Del(r.ctx, r.name+"::"+key).Err()
+	if err != nil {
+		log.Error().Err(err).Str("key", r.name+"::"+key).Msg("Couldn't delete key from cache.")
+	}
+}
+
+func NewRedisCache(name string, opts *redis.Options) ICache {
+	return &RedisCache{
+		name,
+		context.Background(),
+		redis.NewClient(opts),
+	}
+}

server/certificates/acme_client.go

@@ -56,11 +56,8 @@ func NewAcmeClient(cfg config.ACMEConfig, enableHTTPServer bool, challengeCache
 		log.Error().Err(err).Msg("Can't create ACME client, continuing with mock certs only")
 	} else {
 		if cfg.DNSProvider == "" {
-			// using mock server, don't use wildcard certs
-			err := mainDomainAcmeClient.Challenge.SetTLSALPN01Provider(AcmeTLSChallengeProvider{challengeCache})
-			if err != nil {
-				log.Error().Err(err).Msg("Can't create TLS-ALPN-01 provider")
-			}
+			// using mock wildcard certs
+			mainDomainAcmeClient = nil
 		} else {
 			// use DNS-Challenge https://go-acme.github.io/lego/dns/
 			provider, err := dns.NewDNSChallengeProviderByName(cfg.DNSProvider)

server/certificates/cached_challengers.go

@@ -22,7 +22,7 @@ type AcmeTLSChallengeProvider struct {
 var _ challenge.Provider = AcmeTLSChallengeProvider{}
 
 func (a AcmeTLSChallengeProvider) Present(domain, _, keyAuth string) error {
-	return a.challengeCache.Set(domain, keyAuth, 1*time.Hour)
+	return a.challengeCache.Set(domain, []byte(keyAuth), 1*time.Hour)
 }
 
 func (a AcmeTLSChallengeProvider) CleanUp(domain, _, _ string) error {
@@ -38,7 +38,7 @@ type AcmeHTTPChallengeProvider struct {
 var _ challenge.Provider = AcmeHTTPChallengeProvider{}
 
 func (a AcmeHTTPChallengeProvider) Present(domain, token, keyAuth string) error {
-	return a.challengeCache.Set(domain+"/"+token, keyAuth, 1*time.Hour)
+	return a.challengeCache.Set(domain+"/"+token, []byte(keyAuth), 1*time.Hour)
 }
 
 func (a AcmeHTTPChallengeProvider) CleanUp(domain, token, _ string) error {
@@ -60,12 +60,12 @@ func SetupHTTPACMEChallengeServer(challengeCache cache.ICache, sslPort uint) htt
 		// it's an acme request
 		if strings.HasPrefix(ctx.Path(), challengePath) {
 			challenge, ok := challengeCache.Get(domain + "/" + strings.TrimPrefix(ctx.Path(), challengePath))
-			if !ok || challenge == nil {
+			if !ok {
 				log.Info().Msgf("HTTP-ACME challenge for '%s' failed: token not found", domain)
 				ctx.String("no challenge for this token", http.StatusNotFound)
 			}
 			log.Info().Msgf("HTTP-ACME challenge for '%s' succeeded", domain)
-			ctx.String(challenge.(string))
+			ctx.String(string(challenge))
 			return
 		}
 

server/certificates/certificates.go

@@ -10,6 +10,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/OrlovEvgeny/go-mcache"
+
 	"github.com/go-acme/lego/v4/certcrypto"
 	"github.com/go-acme/lego/v4/certificate"
 	"github.com/go-acme/lego/v4/challenge/tlsalpn01"
@@ -31,8 +33,10 @@ func TLSConfig(mainDomainSuffix string,
 	giteaClient *gitea.Client,
 	acmeClient *AcmeClient,
 	firstDefaultBranch string,
-	keyCache, challengeCache, dnsLookupCache, canonicalDomainCache cache.ICache,
+	keyCache *mcache.CacheDriver, challengeCache cache.ICache, dnsLookupCache *mcache.CacheDriver, canonicalDomainCache cache.ICache,
 	certDB database.CertDB,
+	noDNS01 bool,
+	rawDomain string,
 ) *tls.Config {
 	return &tls.Config{
 		// check DNS name & get certificate from Let's Encrypt
@@ -54,7 +58,7 @@ func TLSConfig(mainDomainSuffix string,
 					if !ok {
 						return nil, errors.New("no challenge for this domain")
 					}
-					cert, err := tlsalpn01.ChallengeCert(domain, challenge.(string))
+					cert, err := tlsalpn01.ChallengeCert(domain, string(challenge))
 					if err != nil {
 						return nil, err
 					}
@@ -64,9 +68,24 @@ func TLSConfig(mainDomainSuffix string,
 
 			targetOwner := ""
 			mayObtainCert := true
+
 			if strings.HasSuffix(domain, mainDomainSuffix) || strings.EqualFold(domain, mainDomainSuffix[1:]) {
-				// deliver default certificate for the main domain (*.codeberg.page)
-				domain = mainDomainSuffix
+				if noDNS01 {
+					// Limit the domains allowed to request a certificate to pages-server domains
+					// and domains for an existing user of org
+					if !strings.EqualFold(domain, mainDomainSuffix[1:]) && !strings.EqualFold(domain, rawDomain) {
+						targetOwner := strings.TrimSuffix(domain, mainDomainSuffix)
+						owner_exist, err := giteaClient.GiteaCheckIfOwnerExists(targetOwner)
+						mayObtainCert = owner_exist
+						if err != nil {
+							log.Error().Err(err).Msgf("Failed to check '%s' existence on the forge: %s", targetOwner, err)
+							mayObtainCert = false
+						}
+					}
+				} else {
+					// deliver default certificate for the main domain (*.codeberg.page)
+					domain = mainDomainSuffix
+				}
 			} else {
 				var targetRepo, targetBranch string
 				targetOwner, targetRepo, targetBranch = dnsutils.GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch, dnsLookupCache)
@@ -199,9 +218,6 @@ func (c *AcmeClient) retrieveCertFromDB(sni, mainDomainSuffix string, useDnsProv
 
 func (c *AcmeClient) obtainCert(acmeClient *lego.Client, domains []string, renew *certificate.Resource, user string, useDnsProvider bool, mainDomainSuffix string, keyDatabase database.CertDB) (*tls.Certificate, error) {
 	name := strings.TrimPrefix(domains[0], "*")
-	if useDnsProvider && domains[0] != "" && domains[0][0] == '*' {
-		domains = domains[1:]
-	}
 
 	// lock to avoid simultaneous requests
 	_, working := c.obtainLocks.LoadOrStore(name, struct{}{})
@@ -219,7 +235,11 @@ func (c *AcmeClient) obtainCert(acmeClient *lego.Client, domains []string, renew
 	defer c.obtainLocks.Delete(name)
 
 	if acmeClient == nil {
-		return mockCert(domains[0], "ACME client uninitialized. This is a server error, please report!", mainDomainSuffix, keyDatabase)
+		if useDnsProvider {
+			return mockCert(domains[0], "DNS ACME client is not defined", mainDomainSuffix, keyDatabase)
+		} else {
+			return mockCert(domains[0], "ACME client uninitialized. This is a server error, please report!", mainDomainSuffix, keyDatabase)
+		}
 	}
 
 	// request actual cert

server/database/xorm.go

@@ -52,7 +52,6 @@ func (x xDB) Close() error {
 func (x xDB) Put(domain string, cert *certificate.Resource) error {
 	log.Trace().Str("domain", cert.Domain).Msg("inserting cert to db")
 
-	domain = integrationTestReplacements(domain)
 	c, err := toCert(domain, cert)
 	if err != nil {
 		return err
@@ -82,7 +81,6 @@ func (x xDB) Get(domain string) (*certificate.Resource, error) {
 	if domain[:1] == "." {
 		domain = "*" + domain
 	}
-	domain = integrationTestReplacements(domain)
 
 	cert := new(Cert)
 	log.Trace().Str("domain", domain).Msg("get cert from db")
@@ -99,7 +97,6 @@ func (x xDB) Delete(domain string) error {
 	if domain[:1] == "." {
 		domain = "*" + domain
 	}
-	domain = integrationTestReplacements(domain)
 
 	log.Trace().Str("domain", domain).Msg("delete cert from db")
 	_, err := x.engine.ID(domain).Delete(new(Cert))
@@ -139,13 +136,3 @@ func supportedDriver(driver string) bool {
 		return false
 	}
 }
-
-// integrationTestReplacements is needed because integration tests use a single domain cert,
-// while production use a wildcard cert
-// TODO: find a better way to handle this
-func integrationTestReplacements(domainKey string) string {
-	if domainKey == "*.localhost.mock.directory" {
-		return "localhost.mock.directory"
-	}
-	return domainKey
-}

server/dns/dns.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"time"
 
-	"codeberg.org/codeberg/pages/server/cache"
+	"github.com/OrlovEvgeny/go-mcache"
 )
 
 // lookupCacheTimeout specifies the timeout for the DNS lookup cache.
@@ -15,7 +15,7 @@ var defaultPagesRepo = "pages"
 
 // GetTargetFromDNS searches for CNAME or TXT entries on the request domain ending with MainDomainSuffix.
 // If everything is fine, it returns the target data.
-func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string, dnsLookupCache cache.ICache) (targetOwner, targetRepo, targetBranch string) {
+func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string, dnsLookupCache *mcache.CacheDriver) (targetOwner, targetRepo, targetBranch string) {
 	// Get CNAME or TXT
 	var cname string
 	var err error

server/gitea/cache.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/rs/zerolog/log"
@@ -26,6 +28,9 @@ const (
 	// TODO: move as option into cache interface
 	fileCacheTimeout = 5 * time.Minute
 
+	// ownerExistenceCacheTimeout specifies the timeout for the existence of a repo/org
+	ownerExistenceCacheTimeout = 5 * time.Minute
+
 	// fileCacheSizeLimit limits the maximum file size that will be cached, and is set to 1 MB by default.
 	fileCacheSizeLimit = int64(1000 * 1000)
 )
@@ -38,6 +43,24 @@ type FileResponse struct {
 	Body      []byte
 }
 
+func FileResponseFromMetadataString(metadataString string) FileResponse {
+	parts := strings.Split(metadataString, "\n")
+	res := FileResponse{
+		Exists:    parts[0] == "true",
+		IsSymlink: parts[1] == "true",
+		ETag:      parts[2],
+		MimeType:  parts[3],
+	}
+	return res
+}
+
+func (f FileResponse) MetadataAsString() string {
+	return strconv.FormatBool(f.Exists) + "\n" +
+		strconv.FormatBool(f.IsSymlink) + "\n" +
+		f.ETag + "\n" +
+		f.MimeType + "\n"
+}
+
 func (f FileResponse) IsEmpty() bool {
 	return len(f.Body) == 0
 }
@@ -76,6 +99,7 @@ type writeCacheReader struct {
 	cacheKey       string
 	cache          cache.ICache
 	hasError       bool
+	doNotCache     bool
 }
 
 func (t *writeCacheReader) Read(p []byte) (n int, err error) {
@@ -85,23 +109,28 @@ func (t *writeCacheReader) Read(p []byte) (n int, err error) {
 		log.Trace().Err(err).Msgf("[cache] original reader for %q has returned an error", t.cacheKey)
 		t.hasError = true
 	} else if n > 0 {
-		_, _ = t.buffer.Write(p[:n])
+		if t.buffer.Len()+n > int(fileCacheSizeLimit) {
+			t.doNotCache = true
+			t.buffer.Reset()
+		} else {
+			_, _ = t.buffer.Write(p[:n])
+		}
 	}
 	return
 }
 
 func (t *writeCacheReader) Close() error {
-	doWrite := !t.hasError
+	doWrite := !t.hasError && !t.doNotCache
 	fc := *t.fileResponse
 	fc.Body = t.buffer.Bytes()
-	if fc.IsEmpty() {
-		log.Trace().Msg("[cache] file response is empty")
-		doWrite = false
-	}
 	if doWrite {
-		err := t.cache.Set(t.cacheKey, fc, fileCacheTimeout)
+		err := t.cache.Set(t.cacheKey+"|Metadata", []byte(fc.MetadataAsString()), fileCacheTimeout)
 		if err != nil {
-			log.Trace().Err(err).Msgf("[cache] writer for %q has returned an error", t.cacheKey)
+			log.Trace().Err(err).Msgf("[cache] writer for %q has returned an error", t.cacheKey+"|Metadata")
+		}
+		err = t.cache.Set(t.cacheKey+"|Body", fc.Body, fileCacheTimeout)
+		if err != nil {
+			log.Trace().Err(err).Msgf("[cache] writer for %q has returned an error", t.cacheKey+"|Body")
 		}
 	}
 	log.Trace().Msgf("cacheReader for %q saved=%t closed", t.cacheKey, doWrite)

server/gitea/client.go

@@ -9,7 +9,6 @@ import (
 	"net/http"
 	"net/url"
 	"path"
-	"strconv"
 	"strings"
 	"time"
 
@@ -28,6 +27,7 @@ const (
 	branchTimestampCacheKeyPrefix = "branchTime"
 	defaultBranchCacheKeyPrefix   = "defaultBranch"
 	rawContentCacheKeyPrefix      = "rawContent"
+	ownerExistenceKeyPrefix       = "ownerExist"
 
 	// pages server
 	PagesCacheIndicatorHeader = "X-Pages-Cache"
@@ -114,24 +114,27 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 	log := log.With().Str("cache_key", cacheKey).Logger()
 	log.Trace().Msg("try file in cache")
 	// handle if cache entry exist
-	if cache, ok := client.responseCache.Get(cacheKey); ok {
-		cache := cache.(FileResponse)
+	if cacheMetadata, ok := client.responseCache.Get(cacheKey + "|Metadata"); ok {
+		cache := FileResponseFromMetadataString(string(cacheMetadata))
+		cache.Body, _ = client.responseCache.Get(cacheKey + "|Body")
+		// TODO: don't grab the content from the cache if the ETag matches?!
+
 		cachedHeader, cachedStatusCode := cache.createHttpResponse(cacheKey)
 		// TODO: check against some timestamp mismatch?!?
 		if cache.Exists {
-			log.Debug().Msg("[cache] exists")
 			if cache.IsSymlink {
 				linkDest := string(cache.Body)
 				log.Debug().Msgf("[cache] follow symlink from %q to %q", resource, linkDest)
 				return client.ServeRawContent(targetOwner, targetRepo, ref, linkDest)
-			} else if !cache.IsEmpty() {
+			} else {
 				log.Debug().Msgf("[cache] return %d bytes", len(cache.Body))
 				return io.NopCloser(bytes.NewReader(cache.Body)), cachedHeader, cachedStatusCode, nil
-			} else if cache.IsEmpty() {
-				log.Debug().Msg("[cache] is empty")
 			}
+		} else {
+			return nil, nil, http.StatusNotFound, ErrorNotFound
 		}
 	}
+	// TODO: metadata not written, is close ever called?
 	log.Trace().Msg("file not in cache")
 	// not in cache, open reader via gitea api
 	reader, resp, err := client.sdkClient.GetFileReader(targetOwner, targetRepo, ref, resource, client.supportLFS)
@@ -163,7 +166,11 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 						ETag:      resp.Header.Get(ETagHeader),
 					}
 					log.Trace().Msgf("file response has %d bytes", len(fileResponse.Body))
-					if err := client.responseCache.Set(cacheKey, fileResponse, fileCacheTimeout); err != nil {
+					if err := client.responseCache.Set(cacheKey+"|Metadata", []byte(fileResponse.MetadataAsString()), fileCacheTimeout); err != nil {
+						log.Error().Err(err).Msg("[cache] error on cache write")
+					}
+					// TODO: Test with binary files, as we convert []byte to string! Using []byte values might makes more sense anyways.
+					if err := client.responseCache.Set(cacheKey+"|Body", fileResponse.Body, fileCacheTimeout); err != nil {
 						log.Error().Err(err).Msg("[cache] error on cache write")
 					}
 
@@ -176,10 +183,6 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 			mimeType := client.getMimeTypeByExtension(resource)
 			resp.Response.Header.Set(ContentTypeHeader, mimeType)
 
-			if !shouldRespBeSavedToCache(resp.Response) {
-				return reader, resp.Response.Header, resp.StatusCode, err
-			}
-
 			// now we write to cache and respond at the same time
 			fileResp := FileResponse{
 				Exists:   true,
@@ -189,10 +192,7 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 			return fileResp.CreateCacheReader(reader, client.responseCache, cacheKey), resp.Response.Header, resp.StatusCode, nil
 
 		case http.StatusNotFound:
-			if err := client.responseCache.Set(cacheKey, FileResponse{
-				Exists: false,
-				ETag:   resp.Header.Get(ETagHeader),
-			}, fileCacheTimeout); err != nil {
+			if err := client.responseCache.Set(cacheKey+"|Metadata", []byte(FileResponse{ETag: resp.Header.Get(ETagHeader)}.MetadataAsString()), fileCacheTimeout); err != nil {
 				log.Error().Err(err).Msg("[cache] error on cache write")
 			}
 
@@ -207,21 +207,28 @@ func (client *Client) ServeRawContent(targetOwner, targetRepo, ref, resource str
 func (client *Client) GiteaGetRepoBranchTimestamp(repoOwner, repoName, branchName string) (*BranchTimestamp, error) {
 	cacheKey := fmt.Sprintf("%s/%s/%s/%s", branchTimestampCacheKeyPrefix, repoOwner, repoName, branchName)
 
-	if stamp, ok := client.responseCache.Get(cacheKey); ok && stamp != nil {
-		branchTimeStamp := stamp.(*BranchTimestamp)
-		if branchTimeStamp.notFound {
+	if stamp, ok := client.responseCache.Get(cacheKey); ok {
+		if len(stamp) == 0 {
 			log.Trace().Msgf("[cache] use branch %q not found", branchName)
 			return &BranchTimestamp{}, ErrorNotFound
 		}
 		log.Trace().Msgf("[cache] use branch %q exist", branchName)
-		return branchTimeStamp, nil
+		// This comes from the refactoring of the caching library.
+		// The branch as reported by the API was stored in the cache, and I'm not sure if there are
+		// situations where it differs from the name in the request, hence this is left here.
+		stampParts := strings.SplitN(string(stamp), "|", 2)
+		stampTime, _ := time.Parse(time.RFC3339, stampParts[0])
+		return &BranchTimestamp{
+			Branch:    stampParts[1],
+			Timestamp: stampTime,
+		}, nil
 	}
 
 	branch, resp, err := client.sdkClient.GetRepoBranch(repoOwner, repoName, branchName)
 	if err != nil {
 		if resp != nil && resp.StatusCode == http.StatusNotFound {
 			log.Trace().Msgf("[cache] set cache branch %q not found", branchName)
-			if err := client.responseCache.Set(cacheKey, &BranchTimestamp{Branch: branchName, notFound: true}, branchExistenceCacheTimeout); err != nil {
+			if err := client.responseCache.Set(cacheKey, []byte{}, branchExistenceCacheTimeout); err != nil {
 				log.Error().Err(err).Msg("[cache] error on cache write")
 			}
 			return &BranchTimestamp{}, ErrorNotFound
@@ -238,7 +245,7 @@ func (client *Client) GiteaGetRepoBranchTimestamp(repoOwner, repoName, branchNam
 	}
 
 	log.Trace().Msgf("set cache branch [%s] exist", branchName)
-	if err := client.responseCache.Set(cacheKey, stamp, branchExistenceCacheTimeout); err != nil {
+	if err := client.responseCache.Set(cacheKey, []byte(stamp.Timestamp.Format(time.RFC3339)+"|"+stamp.Branch), branchExistenceCacheTimeout); err != nil {
 		log.Error().Err(err).Msg("[cache] error on cache write")
 	}
 	return stamp, nil
@@ -247,8 +254,8 @@ func (client *Client) GiteaGetRepoBranchTimestamp(repoOwner, repoName, branchNam
 func (client *Client) GiteaGetRepoDefaultBranch(repoOwner, repoName string) (string, error) {
 	cacheKey := fmt.Sprintf("%s/%s/%s", defaultBranchCacheKeyPrefix, repoOwner, repoName)
 
-	if branch, ok := client.responseCache.Get(cacheKey); ok && branch != nil {
-		return branch.(string), nil
+	if branch, ok := client.responseCache.Get(cacheKey); ok {
+		return string(branch), nil
 	}
 
 	repo, resp, err := client.sdkClient.GetRepo(repoOwner, repoName)
@@ -260,12 +267,44 @@ func (client *Client) GiteaGetRepoDefaultBranch(repoOwner, repoName string) (str
 	}
 
 	branch := repo.DefaultBranch
-	if err := client.responseCache.Set(cacheKey, branch, defaultBranchCacheTimeout); err != nil {
+	if err := client.responseCache.Set(cacheKey, []byte(branch), defaultBranchCacheTimeout); err != nil {
 		log.Error().Err(err).Msg("[cache] error on cache write")
 	}
 	return branch, nil
 }
 
+func (client *Client) GiteaCheckIfOwnerExists(owner string) (bool, error) {
+	cacheKey := fmt.Sprintf("%s/%s", ownerExistenceKeyPrefix, owner)
+
+	if exist, ok := client.responseCache.Get(cacheKey); ok && exist != nil {
+		return string(exist) == "true", nil
+	}
+
+	_, resp, err := client.sdkClient.GetUserInfo(owner)
+	if resp.StatusCode == http.StatusOK && err == nil {
+		if err := client.responseCache.Set(cacheKey, []byte("true"), ownerExistenceCacheTimeout); err != nil {
+			log.Error().Err(err).Msg("[cache] error on cache write")
+		}
+		return true, nil
+	} else if resp.StatusCode != http.StatusNotFound {
+		return false, err
+	}
+
+	_, resp, err = client.sdkClient.GetOrg(owner)
+	if resp.StatusCode == http.StatusOK && err == nil {
+		if err := client.responseCache.Set(cacheKey, []byte("true"), ownerExistenceCacheTimeout); err != nil {
+			log.Error().Err(err).Msg("[cache] error on cache write")
+		}
+		return true, nil
+	} else if resp.StatusCode != http.StatusNotFound {
+		return false, err
+	}
+	if err := client.responseCache.Set(cacheKey, []byte("false"), ownerExistenceCacheTimeout); err != nil {
+		log.Error().Err(err).Msg("[cache] error on cache write")
+	}
+	return false, nil
+}
+
 func (client *Client) getMimeTypeByExtension(resource string) string {
 	mimeType := mime.TypeByExtension(path.Ext(resource))
 	mimeTypeSplit := strings.SplitN(mimeType, ";", 2)
@@ -275,22 +314,3 @@ func (client *Client) getMimeTypeByExtension(resource string) string {
 	log.Trace().Msgf("probe mime of %q is %q", resource, mimeType)
 	return mimeType
 }
-
-func shouldRespBeSavedToCache(resp *http.Response) bool {
-	if resp == nil {
-		return false
-	}
-
-	contentLengthRaw := resp.Header.Get(ContentLengthHeader)
-	if contentLengthRaw == "" {
-		return false
-	}
-
-	contentLength, err := strconv.ParseInt(contentLengthRaw, 10, 64)
-	if err != nil {
-		log.Error().Err(err).Msg("could not parse content length")
-	}
-
-	// if content to big or could not be determined we not cache it
-	return contentLength > 0 && contentLength < fileCacheSizeLimit
-}

server/handler/handler.go

@@ -4,6 +4,8 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/OrlovEvgeny/go-mcache"
+
 	"github.com/rs/zerolog/log"
 
 	"codeberg.org/codeberg/pages/config"
@@ -23,7 +25,7 @@ const (
 func Handler(
 	cfg config.ServerConfig,
 	giteaClient *gitea.Client,
-	dnsLookupCache, canonicalDomainCache, redirectsCache cache.ICache,
+	dnsLookupCache *mcache.CacheDriver, canonicalDomainCache, redirectsCache cache.ICache,
 ) http.HandlerFunc {
 	return func(w http.ResponseWriter, req *http.Request) {
 		log.Debug().Msg("\n----------------------------------------------------------")

server/handler/handler_custom_domain.go

@@ -5,6 +5,8 @@ import (
 	"path"
 	"strings"
 
+	"github.com/OrlovEvgeny/go-mcache"
+
 	"codeberg.org/codeberg/pages/html"
 	"codeberg.org/codeberg/pages/server/cache"
 	"codeberg.org/codeberg/pages/server/context"
@@ -19,7 +21,7 @@ func handleCustomDomain(log zerolog.Logger, ctx *context.Context, giteaClient *g
 	trimmedHost string,
 	pathElements []string,
 	firstDefaultBranch string,
-	dnsLookupCache, canonicalDomainCache, redirectsCache cache.ICache,
+	dnsLookupCache *mcache.CacheDriver, canonicalDomainCache, redirectsCache cache.ICache,
 ) {
 	// Serve pages from custom domains
 	targetOwner, targetRepo, targetBranch := dns.GetTargetFromDNS(trimmedHost, mainDomainSuffix, firstDefaultBranch, dnsLookupCache)

server/handler/handler_test.go

@@ -6,6 +6,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/OrlovEvgeny/go-mcache"
+
 	"codeberg.org/codeberg/pages/config"
 	"codeberg.org/codeberg/pages/server/cache"
 	"codeberg.org/codeberg/pages/server/gitea"
@@ -29,7 +31,7 @@ func TestHandlerPerformance(t *testing.T) {
 		AllowedCorsDomains: []string{"raw.codeberg.org", "fonts.codeberg.org", "design.codeberg.org"},
 		PagesBranches:      []string{"pages"},
 	}
-	testHandler := Handler(serverCfg, giteaClient, cache.NewInMemoryCache(), cache.NewInMemoryCache(), cache.NewInMemoryCache())
+	testHandler := Handler(serverCfg, giteaClient, mcache.New(), cache.NewInMemoryCache(), cache.NewInMemoryCache())
 
 	testCase := func(uri string, status int) {
 		t.Run(uri, func(t *testing.T) {

server/startup.go

@@ -11,6 +11,9 @@ import (
 	"strings"
 	"time"
 
+	"github.com/OrlovEvgeny/go-mcache"
+	"github.com/redis/go-redis/v9"
+
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	"github.com/urfave/cli/v2"
@@ -70,16 +73,33 @@ func Serve(ctx *cli.Context) error {
 	}
 	defer closeFn()
 
-	keyCache := cache.NewInMemoryCache()
-	challengeCache := cache.NewInMemoryCache()
+	// keyCache stores the parsed certificate objects (Redis is no advantage here)
+	keyCache := mcache.New()
+	// dnsLookupCache stores DNS lookups for custom domains (Redis is no advantage here)
+	dnsLookupCache := mcache.New()
+
+	var redisErr error = nil
+	createCache := func(name string) cache.ICache {
+		if cfg.Cache.RedisURL != "" {
+			opts, err := redis.ParseURL(cfg.Cache.RedisURL)
+			if err != nil {
+				redisErr = err
+			}
+			return cache.NewRedisCache(name, opts)
+		}
+		return cache.NewInMemoryCache()
+	}
+	// challengeCache stores the certificate challenges
+	challengeCache := createCache("challenge")
 	// canonicalDomainCache stores canonical domains
-	canonicalDomainCache := cache.NewInMemoryCache()
-	// dnsLookupCache stores DNS lookups for custom domains
-	dnsLookupCache := cache.NewInMemoryCache()
+	canonicalDomainCache := createCache("canonicalDomain")
 	// redirectsCache stores redirects in _redirects files
-	redirectsCache := cache.NewInMemoryCache()
+	redirectsCache := createCache("redirects")
 	// clientResponseCache stores responses from the Gitea server
-	clientResponseCache := cache.NewInMemoryCache()
+	clientResponseCache := createCache("clientResponse")
+	if redisErr != nil {
+		return redisErr
+	}
 
 	giteaClient, err := gitea.NewClient(cfg.Gitea, clientResponseCache)
 	if err != nil {
@@ -110,6 +130,8 @@ func Serve(ctx *cli.Context) error {
 		cfg.Server.PagesBranches[0],
 		keyCache, challengeCache, dnsLookupCache, canonicalDomainCache,
 		certDB,
+		cfg.ACME.NoDNS01,
+		cfg.Server.RawDomain,
 	))
 
 	interval := 12 * time.Hour

server/upstream/domains.go

@@ -20,7 +20,7 @@ const canonicalDomainConfig = ".domains"
 func (o *Options) CheckCanonicalDomain(giteaClient *gitea.Client, actualDomain, mainDomainSuffix string, canonicalDomainCache cache.ICache) (domain string, valid bool) {
 	// Check if this request is cached.
 	if cachedValue, ok := canonicalDomainCache.Get(o.TargetOwner + "/" + o.TargetRepo + "/" + o.TargetBranch); ok {
-		domains := cachedValue.([]string)
+		domains := strings.Split(string(cachedValue), "\n")
 		for _, domain := range domains {
 			if domain == actualDomain {
 				valid = true
@@ -33,6 +33,8 @@ func (o *Options) CheckCanonicalDomain(giteaClient *gitea.Client, actualDomain,
 	body, err := giteaClient.GiteaRawContent(o.TargetOwner, o.TargetRepo, o.TargetBranch, canonicalDomainConfig)
 	if err != nil && !errors.Is(err, gitea.ErrorNotFound) {
 		log.Error().Err(err).Msgf("could not read %s of %s/%s", canonicalDomainConfig, o.TargetOwner, o.TargetRepo)
+		// Assume that the domain is valid, as Gitea seems to be broken. Don't cache it though.
+		return actualDomain, true
 	}
 
 	var domains []string
@@ -62,7 +64,7 @@ func (o *Options) CheckCanonicalDomain(giteaClient *gitea.Client, actualDomain,
 	}
 
 	// Add result to cache.
-	_ = canonicalDomainCache.Set(o.TargetOwner+"/"+o.TargetRepo+"/"+o.TargetBranch, domains, canonicalDomainCacheTimeout)
+	_ = canonicalDomainCache.Set(o.TargetOwner+"/"+o.TargetRepo+"/"+o.TargetBranch, []byte(strings.Join(domains, "\n")), canonicalDomainCacheTimeout)
 
 	// Return the first domain from the list and return if any of the domains
 	// matched the requested domain.

server/upstream/redirects.go

@@ -1,6 +1,7 @@
 package upstream
 
 import (
+	"encoding/json"
 	"strconv"
 	"strings"
 	"time"
@@ -29,7 +30,12 @@ func (o *Options) getRedirects(giteaClient *gitea.Client, redirectsCache cache.I
 
 	// Check for cached redirects
 	if cachedValue, ok := redirectsCache.Get(cacheKey); ok {
-		redirects = cachedValue.([]Redirect)
+		redirects := []Redirect{}
+		err := json.Unmarshal(cachedValue, &redirects)
+		if err != nil {
+			log.Error().Err(err).Msgf("could not parse redirects for key %s", cacheKey)
+			// It's okay to continue, the array stays empty.
+		}
 	} else {
 		// Get _redirects file and parse
 		body, err := giteaClient.GiteaRawContent(o.TargetOwner, o.TargetRepo, o.TargetBranch, redirectsConfig)
@@ -58,7 +64,12 @@ func (o *Options) getRedirects(giteaClient *gitea.Client, redirectsCache cache.I
 				})
 			}
 		}
-		_ = redirectsCache.Set(cacheKey, redirects, redirectsCacheTimeout)
+		redirectsJson, err := json.Marshal(redirects)
+		if err != nil {
+			log.Error().Err(err).Msgf("could not store redirects for key %s", cacheKey)
+		} else {
+			_ = redirectsCache.Set(cacheKey, redirectsJson, redirectsCacheTimeout)
+		}
 	}
 	return redirects
 }