feat: Fix and test header parsing

cmd/rio/main.go

@@ -16,6 +16,7 @@ import (
 	"git.polynom.me/rio/internal/certificates"
 	"git.polynom.me/rio/internal/context"
 	"git.polynom.me/rio/internal/dns"
+	riogitea "git.polynom.me/rio/internal/gitea"
 	"git.polynom.me/rio/internal/metrics"
 	"git.polynom.me/rio/internal/pages"
 	"git.polynom.me/rio/internal/repo"
@@ -55,7 +56,7 @@ func handleSubdomain(ctx *context.GlobalContext, domain, cname, path string, req
 		domain,
 		cname,
 		path,
-		ctx.Gitea,
+		ctx,
 	)
 	if err != nil {
 		log.Errorf("Failed to get repo: %s", err)
@@ -187,7 +188,7 @@ func runServer(ctx *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	giteaClient := repo.NewGiteaClient(giteaUrl, giteaApiClient)
+	giteaClient := riogitea.NewGiteaClient(giteaUrl, giteaApiClient)
 
 	// Listen on the port
 	addr := ctx.String("listen-host") + ":" + ctx.String("listen-port")
@@ -208,6 +209,20 @@ func runServer(ctx *cli.Context) error {
 		return err
 	}
 
+	// Prepare the context
+	cacheCtx := context.CacheContext{
+		RepositoryInformationCache: context.MakeRepoInfoCache(),
+		RepositoryPathCache:        context.MakeRepoPathCache(),
+		UsernameCache:              context.MakeUsernameCache(),
+	}
+	globalCtx := &context.GlobalContext{
+		DefaultCSP:   defaultCsp,
+		PagesDomain:  domain,
+		Gitea:        &giteaClient,
+		MetricConfig: &lokiConfig,
+		Cache:        &cacheCtx,
+	}
+
 	if !acmeDisable {
 		if acmeEmail == "" || acmeFile == "" || certsFile == "" || acmeDnsProvider == "" {
 			return errors.New("The options acme-dns-provider, acme-file, acme-email, and certs-file are required")
@@ -261,18 +276,11 @@ func runServer(ctx *cli.Context) error {
 			certsFile,
 			&cache,
 			acmeClient,
-			&giteaClient,
+			globalCtx,
 		)
 		listener = tls.NewListener(listener, tlsConfig)
 	}
 
-	globalCtx := &context.GlobalContext{
-		DefaultCSP:   defaultCsp,
-		PagesDomain:  domain,
-		Gitea:        &giteaClient,
-		MetricConfig: &lokiConfig,
-	}
-
 	var waitGroup sync.WaitGroup
 	servers := 2
 	if acmeDisable {

internal/context/context.go

@@ -3,15 +3,28 @@ package context
 import (
 	"net/http"
 
+	"git.polynom.me/rio/internal/gitea"
 	"git.polynom.me/rio/internal/metrics"
-	"git.polynom.me/rio/internal/repo"
+	"github.com/patrickmn/go-cache"
 )
 
+type CacheContext struct {
+	// Cache for general repository information
+	RepositoryInformationCache cache.Cache
+
+	// Cache for path resolutions
+	RepositoryPathCache cache.Cache
+
+	// Cache for username lookups
+	UsernameCache cache.Cache
+}
+
 type GlobalContext struct {
 	DefaultCSP   string
 	PagesDomain  string
-	Gitea        *repo.GiteaClient
+	Gitea        *gitea.GiteaClient
 	MetricConfig *metrics.LokiMetricConfig
+	Cache        *CacheContext
 }
 
 type Context struct {

internal/context/info.go

@@ -0,0 +1,40 @@
+package context
+
+import (
+	"time"
+
+	"github.com/patrickmn/go-cache"
+)
+
+type RepositoryInformation struct {
+	// Headers to include in every response
+	Headers map[string]string
+
+	CNAME string
+}
+
+func repoInfoKey(owner, name string) string {
+	return owner + ":" + name
+}
+
+func (c *CacheContext) GetRepositoryInformation(owner, repoName string) *RepositoryInformation {
+	data, found := c.RepositoryInformationCache.Get(repoInfoKey(owner, repoName))
+	if !found {
+		return nil
+	}
+
+	typedData := data.(RepositoryInformation)
+	return &typedData
+}
+
+func (c *CacheContext) SetRepositoryInformation(owner, repoName string, info RepositoryInformation) {
+	c.RepositoryInformationCache.Set(
+		repoInfoKey(owner, repoName),
+		info,
+		cache.DefaultExpiration,
+	)
+}
+
+func MakeRepoInfoCache() cache.Cache {
+	return *cache.New(24*time.Hour, 12*time.Hour)
+}

internal/context/path.go

@@ -0,0 +1,39 @@
+package context
+
+import (
+	"time"
+
+	"git.polynom.me/rio/internal/gitea"
+	"github.com/patrickmn/go-cache"
+)
+
+type RepositoryPathInformation struct {
+	Repository gitea.Repository
+	Path       string
+}
+
+func pathInfoKey(domain, path string) string {
+	return domain + "/" + path
+}
+
+func (c *CacheContext) GetRepositoryPath(domain, path string) *RepositoryPathInformation {
+	data, found := c.RepositoryPathCache.Get(pathInfoKey(domain, path))
+	if !found {
+		return nil
+	}
+
+	typedData := data.(RepositoryPathInformation)
+	return &typedData
+}
+
+func (c *CacheContext) SetRepositoryPath(domain, path string, info RepositoryPathInformation) {
+	c.RepositoryPathCache.Set(
+		pathInfoKey(domain, path),
+		info,
+		cache.DefaultExpiration,
+	)
+}
+
+func MakeRepoPathCache() cache.Cache {
+	return *cache.New(24*time.Hour, 12*time.Hour)
+}

internal/context/user.go

@@ -0,0 +1,24 @@
+package context
+
+import (
+	"time"
+
+	"github.com/patrickmn/go-cache"
+)
+
+func (c *CacheContext) GetUser(username string) bool {
+	_, found := c.UsernameCache.Get(username)
+	return found
+}
+
+func (c *CacheContext) SetUser(username string) {
+	c.UsernameCache.Set(
+		username,
+		true,
+		cache.DefaultExpiration,
+	)
+}
+
+func MakeUsernameCache() cache.Cache {
+	return *cache.New(24*time.Hour, 12*time.Hour)
+}

internal/gitea/client.go

@@ -1,4 +1,4 @@
-package repo
+package gitea
 
 import (
 	"fmt"
@@ -38,17 +38,17 @@ type Repository struct {
 }
 
 type GiteaClient struct {
-	getRepository GetRepositoryMethod
-	hasBranch     HasBranchMethod
-	hasUser       HasUserMethod
+	GetRepository GetRepositoryMethod
+	HasBranch     HasBranchMethod
+	HasUser       HasUserMethod
 	GetFile       GetFileMethod
-	lookupCNAME   LookupCNAMEMethod
-	lookupRepoTXT LookupRepoTXTMethod
+	LookupCNAME   LookupCNAMEMethod
+	LookupRepoTXT LookupRepoTXTMethod
 }
 
 func NewGiteaClient(giteaUrl string, giteaClient *gitea.Client) GiteaClient {
 	return GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+		GetRepository: func(username, repositoryName string) (Repository, error) {
 			repo, _, err := giteaClient.GetRepo(username, repositoryName)
 			if err != nil {
 				return Repository{}, err
@@ -58,7 +58,7 @@ func NewGiteaClient(giteaUrl string, giteaClient *gitea.Client) GiteaClient {
 				Name: repo.Name,
 			}, nil
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			res, _, err := giteaClient.ListRepoBranches(username, repositoryName, gitea.ListRepoBranchesOptions{})
 			if err != nil {
 				return false
@@ -71,7 +71,7 @@ func NewGiteaClient(giteaUrl string, giteaClient *gitea.Client) GiteaClient {
 			}
 			return false
 		},
-		hasUser: func(username string) bool {
+		HasUser: func(username string) bool {
 			_, _, err := giteaClient.GetUserInfo(username)
 			return err == nil
 		},
@@ -109,10 +109,10 @@ func NewGiteaClient(giteaUrl string, giteaClient *gitea.Client) GiteaClient {
 				return content, true, err
 			}
 		},
-		lookupCNAME: func(domain string) (string, error) {
+		LookupCNAME: func(domain string) (string, error) {
 			return dns.LookupCNAME(domain)
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
+		LookupRepoTXT: func(domain string) (string, error) {
 			return dns.LookupRepoTXT(domain)
 		},
 	}

internal/pages/pages.go

@@ -9,7 +9,6 @@ import (
 
 	"git.polynom.me/rio/internal/constants"
 	"git.polynom.me/rio/internal/context"
-	"git.polynom.me/rio/internal/repo"
 
 	"github.com/patrickmn/go-cache"
 	log "github.com/sirupsen/logrus"
@@ -29,7 +28,7 @@ func makePageContentCacheEntry(username, path string) string {
 	return username + ":" + path
 }
 
-func addHeaders(csp, contentType string, contentLength int, w http.ResponseWriter) {
+func addHeaders(repoInfo *context.RepositoryInformation, contentType string, contentLength int, w http.ResponseWriter) {
 	// Always set a content type
 	if strings.Trim(contentType, " ") == "" {
 		w.Header().Set("Content-Type", "application/octet-stream")
@@ -41,8 +40,10 @@ func addHeaders(csp, contentType string, contentLength int, w http.ResponseWrite
 	w.Header().Set("Strict-Transport-Security", "max-age=31536000")
 	w.Header().Set("Content-Length", strconv.Itoa(contentLength))
 
-	if csp != "" {
-		w.Header().Set("Content-Security-Policy", csp)
+	if repoInfo != nil {
+		for key, value := range repoInfo.Headers {
+			w.Header().Set(key, value)
+		}
 	}
 }
 
@@ -74,16 +75,19 @@ func ServeFile(context *context.Context) {
 		path,
 		since,
 	)
-	csp := repo.GetCSPForRepository(context.Username, context.Reponame, "", context.Global.Gitea)
+	repoInfo := context.Global.Cache.GetRepositoryInformation(
+		context.Username,
+		context.Reponame,
+	)
 
 	if err != nil {
 		if !found {
 			log.Errorf("Failed to get file %s/%s/%s (%s)", context.Username, context.Reponame, path, err)
-			addHeaders(csp, "text/html", 0, context.Writer)
+			addHeaders(repoInfo, "text/html", 0, context.Writer)
 			context.Writer.WriteHeader(404)
 		} else {
 			log.Debugf("Request failed but page %s is cached in memory", path)
-			addHeaders(csp, mimeType, len(content), context.Writer)
+			addHeaders(repoInfo, mimeType, len(content), context.Writer)
 			context.Writer.WriteHeader(200)
 			context.Writer.Write(content)
 		}
@@ -93,7 +97,7 @@ func ServeFile(context *context.Context) {
 
 	if found && !changed {
 		log.Debugf("Page %s is unchanged and cached in memory", path)
-		addHeaders(csp, mimeType, len(content), context.Writer)
+		addHeaders(repoInfo, mimeType, len(content), context.Writer)
 		context.Writer.WriteHeader(200)
 		context.Writer.Write(content)
 		return
@@ -115,7 +119,7 @@ func ServeFile(context *context.Context) {
 	)
 
 	log.Debugf("Page %s requested from Gitea and cached in memory at %v", path, now)
-	addHeaders(csp, mimeType, len(content), context.Writer)
+	addHeaders(repoInfo, mimeType, len(content), context.Writer)
 	context.Writer.WriteHeader(200)
 	context.Writer.Write(content)
 

internal/repo/repo.go

@@ -3,119 +3,85 @@ package repo
 //go:generate mockgen -destination mock_repo_test.go -package repo code.gitea.io/sdk/gitea Client
 
 import (
+	"encoding/json"
 	"errors"
+	"slices"
 	"strings"
-	"time"
 
 	"git.polynom.me/rio/internal/constants"
+	"git.polynom.me/rio/internal/context"
+	"git.polynom.me/rio/internal/gitea"
 
-	"github.com/patrickmn/go-cache"
 	log "github.com/sirupsen/logrus"
 )
 
 var (
-	pathCache = cache.New(1*time.Hour, 1*time.Hour)
-
-	// Caching the existence of an user
-	userCache = cache.New(24*time.Hour, 12*time.Hour)
-
-	// Caches the existence of a Content-Security-Policy
-	// Mapping: Repository key -> CSPCacheEntry
-	cspCache = cache.New(24*time.Hour, 12*time.Hour)
+	ForbiddenHeaders = []string{
+		"content-length",
+		"content-type",
+		"date",
+		"location",
+		"strict-transport-security",
+		"set-cookie",
+	}
 )
 
-type PageCacheEntry struct {
-	Repository Repository
-	Path       string
-}
-
-type CSPCacheEntry struct {
-	CSP           string
-	LastRequested time.Time
-}
-
-func makePageCacheKey(domain, path string) string {
-	return domain + "/" + path
-}
-
-func makeCSPCacheKey(username, repositoryName string) string {
-	return username + ":" + repositoryName
-}
-
-func lookupRepositoryAndCache(username, reponame, branchName, host, domain, path, cname string, giteaClient *GiteaClient) (*Repository, error) {
+func lookupRepositoryAndCache(username, reponame, branchName, host, domain, path, cname string, ctx *context.GlobalContext) (*gitea.Repository, error) {
 	log.Debugf("CNAME: %s", cname)
 	log.Debugf("Looking up repository %s/%s", username, reponame)
-	repo, err := giteaClient.getRepository(username, reponame)
+	repo, err := ctx.Gitea.GetRepository(username, reponame)
 	if err != nil {
 		return nil, err
 	}
 
-	if !giteaClient.hasBranch(username, reponame, branchName) {
+	if !ctx.Gitea.HasBranch(username, reponame, branchName) {
 		return nil, errors.New("Specified branch does not exist")
 	}
 
 	// Check if the CNAME file matches
+
 	if cname != "" {
 		log.Debug("Checking CNAME")
-		file, _, err := giteaClient.GetFile(
-			username,
-			reponame,
-			constants.PagesBranch,
-			"CNAME",
-			nil,
-		)
-		if err != nil {
-			log.Errorf(
-				"Could not verify CNAME of %s/%s@%s: %v\n",
-				username,
-				reponame,
-				constants.PagesBranch,
-				err,
-			)
-			return nil, err
+		repoInfo := GetRepositoryInformation(username, reponame, ctx)
+		if repoInfo == nil {
+			log.Warn("Repository does not contain a rio.json file")
+			return nil, errors.New("No CNAME available in repository")
 		}
 
-		cnameContent := strings.Trim(
-			string(file[:]),
-			"\n",
-		)
-
-		log.Debugf("CNAME Content: %s", cnameContent)
-		if cnameContent != host {
-			log.Warnf("CNAME mismatch: Repo '%s', Host '%s'", cnameContent, host)
+		log.Debugf("CNAME Content: \"%s\"", repoInfo.CNAME)
+		if repoInfo.CNAME != host {
+			log.Warnf("CNAME mismatch: Repo '%s', Host '%s'", repoInfo.CNAME, host)
 			return nil, errors.New("CNAME mismatch")
 		}
 	}
 
 	// Cache data
-	pathCache.Set(
-		makePageCacheKey(domain, path),
-		PageCacheEntry{
-			repo,
-			path,
+	ctx.Cache.SetRepositoryPath(
+		domain,
+		path,
+		context.RepositoryPathInformation{
+			Repository: repo,
+			Path:       path,
 		},
-		cache.DefaultExpiration,
 	)
 	return &repo, nil
 }
 
 // host is the domain name we're accessed from. cname is the domain that host is pointing
 // if, if we're accessed via a CNAME. If not, then cname is "".
-func RepoFromPath(username, host, cname, path string, giteaClient *GiteaClient) (*Repository, string, error) {
+func RepoFromPath(username, host, cname, path string, ctx *context.GlobalContext) (*gitea.Repository, string, error) {
 	domain := host
 
 	// Guess the repository
-	key := makePageCacheKey(domain, path)
-	entry, found := pathCache.Get(key)
-	if found {
-		pageEntry := entry.(PageCacheEntry)
-		return &pageEntry.Repository, pageEntry.Path, nil
+	entry := ctx.Cache.GetRepositoryPath(domain, path)
+	if entry != nil {
+		return &entry.Repository, entry.Path, nil
 	}
 
 	// Allow specifying the repository name in the TXT record
 	reponame := ""
 	if cname != "" {
-		repoLookup, err := giteaClient.lookupRepoTXT(host)
+		repoLookup, err := ctx.Gitea.LookupRepoTXT(host)
 		if err == nil && repoLookup != "" {
 			log.Infof(
 				"TXT lookup for %s resulted in choosing repository %s",
@@ -139,7 +105,7 @@ func RepoFromPath(username, host, cname, path string, giteaClient *GiteaClient)
 			domain,
 			modifiedPath,
 			cname,
-			giteaClient,
+			ctx,
 		)
 		if err == nil {
 			return repo, modifiedPath, nil
@@ -158,7 +124,7 @@ func RepoFromPath(username, host, cname, path string, giteaClient *GiteaClient)
 		domain,
 		path,
 		cname,
-		giteaClient,
+		ctx,
 	)
 	return repo, path, err
 }
@@ -166,52 +132,92 @@ func RepoFromPath(username, host, cname, path string, giteaClient *GiteaClient)
 // Checks if the username exists as an organisation or an user on the Gitea
 // instance, so that an attacker can't just request certificates for random
 // usernames.
-func CanRequestCertificate(username string, giteaClient *GiteaClient) bool {
-	if _, found := userCache.Get(username); found {
+func CanRequestCertificate(username string, ctx *context.GlobalContext) bool {
+	found := ctx.Cache.GetUser(username)
+	if found {
 		return true
 	}
 
-	hasUser := giteaClient.hasUser(username)
+	hasUser := ctx.Gitea.HasUser(username)
 	if hasUser {
-		userCache.Set(username, true, cache.DefaultExpiration)
+		ctx.Cache.SetUser(username)
 	}
 	return hasUser
 }
 
-// Checks the repository username/repository@PagesBranch for a file named CSP. If it exists,
-// read it and return the value. If it does not exist, return defaultCsp.
-func GetCSPForRepository(username, repositoryName, defaultCsp string, giteaClient *GiteaClient) string {
-	key := makeCSPCacheKey(username, repositoryName)
-	cachedCsp, found := cspCache.Get(key)
-	var since time.Time
-	if found {
-		since = cachedCsp.(CSPCacheEntry).LastRequested
-	}
+func filterHeaders(headers map[string]interface{}) map[string]string {
+	newHeaders := make(map[string]string)
 
-	fetchedCsp, changed, err := giteaClient.GetFile(
-		username,
-		repositoryName,
-		constants.PagesBranch,
-		"CSP",
-		&since,
-	)
-	csp := ""
-	if err != nil {
-		if found {
-			return cachedCsp.(CSPCacheEntry).CSP
+	for key, value := range headers {
+		if slices.Contains[[]string, string](ForbiddenHeaders, strings.ToLower(key)) {
+			continue
 		}
 
-		csp = defaultCsp
-	} else {
-		csp = string(fetchedCsp)
-
-		if !found || changed {
-			cspCache.Set(key, CSPCacheEntry{
-				CSP:           csp,
-				LastRequested: time.Now(),
-			}, cache.DefaultExpiration)
+		switch value.(type) {
+		case string:
+			newHeaders[key] = value.(string)
 		}
 	}
 
-	return csp
+	return newHeaders
+}
+
+func GetRepositoryInformation(owner, repoName string, ctx *context.GlobalContext) *context.RepositoryInformation {
+	res := ctx.Cache.GetRepositoryInformation(owner, repoName)
+	if res != nil {
+		return res
+	}
+
+	fetchedConfig, _, err := ctx.Gitea.GetFile(
+		owner,
+		repoName,
+		constants.PagesBranch,
+		"rio.json",
+		nil,
+	)
+	if err != nil {
+		log.Errorf("Failed to request rio.json for %s/%s:%v", owner, repoName, err)
+		return nil
+	}
+
+	var payload map[string]interface{}
+	err = json.Unmarshal(fetchedConfig, &payload)
+	if err != nil {
+		log.Errorf("Failed to unmarshal rio.json for %s/%s:%v", owner, repoName, err)
+		return nil
+	}
+
+	headers, found := payload["headers"]
+	if !found {
+		log.Warnf("Did not find headers key in rio.json for %s/%s", owner, repoName)
+		headers = make(map[string]interface{})
+	} else {
+		switch headers.(type) {
+		case map[string]interface{}:
+			// NOOP
+		default:
+			log.Warn("headers attribute has invalid data type")
+			headers = make(map[string]string)
+		}
+	}
+
+	cname, found := payload["CNAME"]
+	if found {
+		switch cname.(type) {
+		case string:
+			// NOOP
+		default:
+			log.Warnf("CNAME attribute is not a string for %s/%s", owner, repoName)
+			cname = ""
+		}
+	} else {
+		cname = ""
+	}
+
+	info := context.RepositoryInformation{
+		Headers: filterHeaders(headers.(map[string]interface{})),
+		CNAME:   cname.(string),
+	}
+	ctx.Cache.SetRepositoryInformation(owner, repoName, info)
+	return &info
 }

internal/repo/repo_test.go

@@ -2,28 +2,44 @@ package repo
 
 import (
 	"errors"
-	"net/http"
+	"strings"
 	"testing"
 	"time"
 
-	"code.gitea.io/sdk/gitea"
+	"git.polynom.me/rio/internal/context"
+	"git.polynom.me/rio/internal/gitea"
+
 	log "github.com/sirupsen/logrus"
 )
 
-func clearCache() {
-	pathCache.Flush()
-	userCache.Flush()
-	cspCache.Flush()
+func TestHeaderFilter(t *testing.T) {
+	map1 := filterHeaders(
+		map[string]interface{}{
+			"Content-Type":            "hallo",
+			"content-Type":            "welt",
+			"content-type":            "uwu",
+			"CONTENT-TYPE":            "lol",
+			"Content-Security-Policy": "none",
+		},
+	)
+
+	if len(map1) != 1 {
+		t.Fatalf("filterHeaders allowed %d != 1 headers", len(map1))
+	}
+
+	for key := range map1 {
+		if strings.ToLower(key) == "content-type" {
+			t.Fatalf("filterHeaders allowed Content-Type")
+		}
+	}
 }
 
 func TestPickingCorrectRepositoryDefault(t *testing.T) {
 	// Test that we default to the <username>.<pages domain> repository, if we have only
 	// one path component.
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username != "example-user" {
 				t.Fatalf("Called with unknown user %s", username)
 			}
@@ -31,9 +47,9 @@ func TestPickingCorrectRepositoryDefault(t *testing.T) {
 				t.Fatalf("Called with unknown repository %s", repositoryName)
 			}
 
-			return Repository{}, nil
+			return gitea.Repository{}, nil
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
 				return true
 			}
@@ -44,17 +60,24 @@ func TestPickingCorrectRepositoryDefault(t *testing.T) {
 			t.Fatal("getFile called")
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
-			t.Fatal("lookupCNAME called")
+		LookupCNAME: func(domain string) (string, error) {
+			t.Fatal("LookupCNAME called")
 			return "", nil
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
-			t.Fatal("lookupRepoTXT called")
+		LookupRepoTXT: func(domain string) (string, error) {
+			t.Fatal("LookupRepoTXT called")
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "index.html", &client)
+	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "index.html", ctx)
 	if err != nil {
 		t.Fatalf("An error occured: %v", err)
 	}
@@ -69,24 +92,22 @@ func TestPickingCorrectRepositoryDefault(t *testing.T) {
 func TestPickingCorrectRepositoryDefaultSubdirectory(t *testing.T) {
 	// Test that we return the default repository when the first path component does
 	// not correspong to an existing repository.
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username != "example-user" {
 				t.Fatalf("Called with unknown user %s", username)
 			}
 			if repositoryName == "assets" {
-				return Repository{}, errors.New("Repository does not exist")
+				return gitea.Repository{}, errors.New("gitea.Repository does not exist")
 			} else if repositoryName == "example-user.pages.example.org" {
-				return Repository{}, nil
+				return gitea.Repository{}, nil
 			} else {
 				t.Fatalf("Called with unknown repository %s", repositoryName)
-				return Repository{}, nil
+				return gitea.Repository{}, nil
 			}
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
 				return true
 			}
@@ -97,17 +118,24 @@ func TestPickingCorrectRepositoryDefaultSubdirectory(t *testing.T) {
 			t.Fatal("getFile called")
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
-			t.Fatal("lookupCNAME called")
+		LookupCNAME: func(domain string) (string, error) {
+			t.Fatal("LookupCNAME called")
 			return "", nil
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
-			t.Fatal("lookupRepoTXT called")
+		LookupRepoTXT: func(domain string) (string, error) {
+			t.Fatal("LookupRepoTXT called")
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "assets/index.css", &client)
+	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "assets/index.css", ctx)
 	if err != nil {
 		t.Fatalf("An error occured: %v", err)
 	}
@@ -122,28 +150,26 @@ func TestPickingCorrectRepositoryDefaultSubdirectory(t *testing.T) {
 func TestPickingCorrectRepositorySubdirectoryNoPagesBranch(t *testing.T) {
 	// Test that we're picking the correct repository when the first path component
 	// returns a repository without a pages branch.
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username != "example-user" {
 				t.Fatalf("Called with unknown user %s", username)
 			}
 			if repositoryName == "blog" {
-				return Repository{
+				return gitea.Repository{
 					Name: "blog",
 				}, nil
 			} else if repositoryName == "example-user.pages.example.org" {
-				return Repository{
+				return gitea.Repository{
 					Name: "example-user.pages.example.org",
 				}, nil
 			} else {
 				t.Fatalf("Called with unknown repository %s", repositoryName)
-				return Repository{}, nil
+				return gitea.Repository{}, nil
 			}
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
 				return true
 			}
@@ -154,17 +180,24 @@ func TestPickingCorrectRepositorySubdirectoryNoPagesBranch(t *testing.T) {
 			t.Fatal("getFile called")
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
-			t.Fatal("lookupCNAME called")
+		LookupCNAME: func(domain string) (string, error) {
+			t.Fatal("LookupCNAME called")
 			return "", nil
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
-			t.Fatal("lookupRepoTXT called")
+		LookupRepoTXT: func(domain string) (string, error) {
+			t.Fatal("LookupRepoTXT called")
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "blog/post1.html", &client)
+	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "blog/post1.html", ctx)
 	if err != nil {
 		t.Fatalf("An error occured: %v", err)
 	}
@@ -181,21 +214,19 @@ func TestPickingCorrectRepositorySubdirectoryNoPagesBranch(t *testing.T) {
 
 func TestPickingNoRepositoryInvalidCNAME(t *testing.T) {
 	// Test that we're not picking a repository if the CNAME validation fails.
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username == "example-user" && repositoryName == "example-user.pages.example.org" {
-				return Repository{
+				return gitea.Repository{
 					Name: "example-user.pages.example.org",
 				}, nil
 			} else {
 				t.Fatalf("Called with unknown repository %s", repositoryName)
-				return Repository{}, nil
+				return gitea.Repository{}, nil
 			}
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
 				return true
 			}
@@ -203,44 +234,49 @@ func TestPickingNoRepositoryInvalidCNAME(t *testing.T) {
 			return false
 		},
 		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
-			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branch == "pages" && path == "CNAME" {
-				return []byte("some-other-domain.local"), true, nil
+			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branch == "pages" && path == "rio.json" {
+				return []byte("{\"CNAME\": \"some-other-domain.local\"}"), true, nil
 			}
 
 			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
+		LookupCNAME: func(domain string) (string, error) {
 			return "", errors.New("No CNAME")
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
+		LookupRepoTXT: func(domain string) (string, error) {
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	_, _, err := RepoFromPath("example-user", "example-user.pages.example.org", "example-user.local", "index.html", &client)
+	_, _, err := RepoFromPath("example-user", "example-user.pages.example.org", "example-user.local", "index.html", ctx)
 	if err == nil {
-		t.Fatal("Repository returned even though CNAME validation should fail")
+		t.Fatal("gitea.Repository returned even though CNAME validation should fail")
 	}
 }
 
 func TestPickingRepositoryValidCNAME(t *testing.T) {
 	// Test that we're picking a repository, given a CNAME, if the CNAME validation succeeds.
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username == "example-user" && repositoryName == "example-user.local" {
-				return Repository{
+				return gitea.Repository{
 					Name: "example-user.local",
 				}, nil
 			} else {
 				t.Fatalf("Called with unknown repository %s", repositoryName)
-				return Repository{}, nil
+				return gitea.Repository{}, nil
 			}
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "example-user.local" && branchName == "pages" {
 				return true
 			}
@@ -248,22 +284,29 @@ func TestPickingRepositoryValidCNAME(t *testing.T) {
 			return false
 		},
 		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
-			if username == "example-user" && repositoryName == "example-user.local" && branch == "pages" && path == "CNAME" {
-				return []byte("example-user.local"), true, nil
+			if username == "example-user" && repositoryName == "example-user.local" && branch == "pages" && path == "rio.json" {
+				return []byte("{\"CNAME\": \"example-user.local\"}"), true, nil
 			}
 
 			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
+		LookupCNAME: func(domain string) (string, error) {
 			return "", errors.New("No CNAME")
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
+		LookupRepoTXT: func(domain string) (string, error) {
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", &client)
+	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", ctx)
 	if err != nil {
 		t.Fatalf("Error returned: %v", err)
 	}
@@ -275,21 +318,19 @@ func TestPickingRepositoryValidCNAME(t *testing.T) {
 func TestPickingRepositoryValidCNAMEWithTXTLookup(t *testing.T) {
 	// Test that we're picking a repository, given a CNAME, if the CNAME validation succeeds
 	// and the TXT lookup returns something different.
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username == "example-user" && repositoryName == "some-different-repository" {
-				return Repository{
+				return gitea.Repository{
 					Name: "some-different-repository",
 				}, nil
 			} else {
 				t.Fatalf("Called with unknown repository %s", repositoryName)
-				return Repository{}, nil
+				return gitea.Repository{}, nil
 			}
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "some-different-repository" && branchName == "pages" {
 				return true
 			}
@@ -297,25 +338,32 @@ func TestPickingRepositoryValidCNAMEWithTXTLookup(t *testing.T) {
 			return false
 		},
 		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
-			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "CNAME" {
-				return []byte("example-user.local"), true, nil
+			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "rio.json" {
+				return []byte("{\"CNAME\": \"example-user.local\"}"), true, nil
 			}
 
 			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
+		LookupCNAME: func(domain string) (string, error) {
 			return "", errors.New("No CNAME")
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
+		LookupRepoTXT: func(domain string) (string, error) {
 			if domain == "example-user.local" {
 				return "some-different-repository", nil
 			}
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", &client)
+	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", ctx)
 	if err != nil {
 		t.Fatalf("Error returned: %v", err)
 	}
@@ -327,20 +375,18 @@ func TestPickingRepositoryValidCNAMEWithTXTLookup(t *testing.T) {
 func TestPickingRepositoryValidCNAMEWithTXTLookupAndSubdirectory(t *testing.T) {
 	// Test that we're picking a repository, given a CNAME, if the CNAME validation succeeds
 	// and the TXT lookup returns something different. Additionally, we now have a subdirectory
-	defer clearCache()
-
 	log.SetLevel(log.DebugLevel)
-	client := GiteaClient{
-		getRepository: func(username, repositoryName string) (Repository, error) {
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
 			if username == "example-user" && repositoryName == "some-different-repository" {
-				return Repository{
+				return gitea.Repository{
 					Name: "some-different-repository",
 				}, nil
 			}
 
-			return Repository{}, errors.New("Unknown repository")
+			return gitea.Repository{}, errors.New("Unknown repository")
 		},
-		hasBranch: func(username, repositoryName, branchName string) bool {
+		HasBranch: func(username, repositoryName, branchName string) bool {
 			if username == "example-user" && repositoryName == "some-different-repository" && branchName == "pages" {
 				return true
 			}
@@ -348,25 +394,32 @@ func TestPickingRepositoryValidCNAMEWithTXTLookupAndSubdirectory(t *testing.T) {
 			return false
 		},
 		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
-			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "CNAME" {
-				return []byte("example-user.local"), true, nil
+			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "rio.json" {
+				return []byte("{\"CNAME\": \"example-user.local\"}"), true, nil
 			}
 
 			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
 			return []byte{}, true, nil
 		},
-		lookupCNAME: func(domain string) (string, error) {
+		LookupCNAME: func(domain string) (string, error) {
 			return "", errors.New("No CNAME")
 		},
-		lookupRepoTXT: func(domain string) (string, error) {
+		LookupRepoTXT: func(domain string) (string, error) {
 			if domain == "example-user.local" {
 				return "some-different-repository", nil
 			}
 			return "", nil
 		},
 	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
 
-	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "blog/index.html", &client)
+	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "blog/index.html", ctx)
 	if err != nil {
 		t.Fatalf("Error returned: %v", err)
 	}
@@ -375,31 +428,123 @@ func TestPickingRepositoryValidCNAMEWithTXTLookupAndSubdirectory(t *testing.T) {
 	}
 }
 
-func TestGetCSPForRepositoryNegativeIntegration(t *testing.T) {
-	defer clearCache()
+func TestHeaderParsingEmpty(t *testing.T) {
+	// Test that we are correctly handling a repository with no headers.
+	log.SetLevel(log.DebugLevel)
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
+			if username == "example-user" && repositoryName == "some-different-repository" {
+				return gitea.Repository{
+					Name: "some-different-repository",
+				}, nil
+			}
 
-	httpClient := http.Client{Timeout: 10 * time.Second}
-	giteaClient, err := gitea.NewClient(
-		"https://git.polynom.me",
-		gitea.SetHTTPClient(&httpClient),
-		gitea.SetToken(""),
-		gitea.SetUserAgent("rio-testing"),
-	)
-	if err != nil {
-		t.Fatalf("Failed to create Gitea client: %v", err)
+			return gitea.Repository{}, errors.New("Unknown repository")
+		},
+		HasBranch: func(username, repositoryName, branchName string) bool {
+			if username == "example-user" && repositoryName == "some-different-repository" && branchName == "pages" {
+				return true
+			}
+
+			return false
+		},
+		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
+			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "rio.json" {
+				return []byte("{\"CNAME\": \"example-user.local\"}"), true, nil
+			}
+
+			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
+			return []byte{}, true, nil
+		},
+		LookupCNAME: func(domain string) (string, error) {
+			return "", errors.New("No CNAME")
+		},
+		LookupRepoTXT: func(domain string) (string, error) {
+			if domain == "example-user.local" {
+				return "some-different-repository", nil
+			}
+			return "", nil
+		},
+	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
 	}
-	client := NewGiteaClient("https://git.polynom.me", giteaClient)
 
-	// The repository has no CSP file, so it should return the invalid value
-	defaultValue := "<INVALID>"
-	csp := GetCSPForRepository(
-		"papatutuwawa",
-		"rio",
-		defaultValue,
-		&client,
-	)
+	info := GetRepositoryInformation("example-user", "some-different-repository", ctx)
+	if info == nil {
+		t.Fatalf("No repository information returned")
+	}
 
-	if csp != defaultValue {
-		t.Fatalf("Unexpected CSP returned: %s", csp)
+	if len(info.Headers) > 0 {
+		t.Fatalf("Headers returned: %v", info.Headers)
+	}
+}
+
+func TestHeaderParsing(t *testing.T) {
+	// Test that we are correctly handling a repository with no headers.
+	log.SetLevel(log.DebugLevel)
+	client := gitea.GiteaClient{
+		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
+			if username == "example-user" && repositoryName == "some-different-repository" {
+				return gitea.Repository{
+					Name: "some-different-repository",
+				}, nil
+			}
+
+			return gitea.Repository{}, errors.New("Unknown repository")
+		},
+		HasBranch: func(username, repositoryName, branchName string) bool {
+			if username == "example-user" && repositoryName == "some-different-repository" && branchName == "pages" {
+				return true
+			}
+
+			return false
+		},
+		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
+			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "rio.json" {
+				return []byte("{\"CNAME\": \"example-user.local\", \"headers\": {\"X-Cool-Header\": \"Very nice!\"}}"), true, nil
+			}
+
+			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
+			return []byte{}, true, nil
+		},
+		LookupCNAME: func(domain string) (string, error) {
+			return "", errors.New("No CNAME")
+		},
+		LookupRepoTXT: func(domain string) (string, error) {
+			if domain == "example-user.local" {
+				return "some-different-repository", nil
+			}
+			return "", nil
+		},
+	}
+	ctx := &context.GlobalContext{
+		Gitea: &client,
+		Cache: &context.CacheContext{
+			RepositoryInformationCache: context.MakeRepoInfoCache(),
+			RepositoryPathCache:        context.MakeRepoPathCache(),
+		},
+	}
+
+	info := GetRepositoryInformation("example-user", "some-different-repository", ctx)
+	if info == nil {
+		t.Fatalf("No repository information returned")
+	}
+
+	if len(info.Headers) != 1 {
+		t.Fatalf("len(info.Headers) != 1: %v", info.Headers)
+	}
+
+	header, found := info.Headers["X-Cool-Header"]
+	if !found {
+		t.Fatal("Header X-Cool-Header not found")
+	}
+
+	if header != "Very nice!" {
+		t.Fatalf("Invalid header value for X-Cool-Header: \"%s\"", header)
 	}
 }

internal/server/tls.go

@@ -7,6 +7,7 @@ import (
 	"sync"
 
 	"git.polynom.me/rio/internal/certificates"
+	"git.polynom.me/rio/internal/context"
 	"git.polynom.me/rio/internal/dns"
 	"git.polynom.me/rio/internal/repo"
 
@@ -81,7 +82,7 @@ func getUsername(sni, pagesDomain string) (string, error) {
 	return dns.ExtractUsername(pagesDomain, sni), nil
 }
 
-func MakeTlsConfig(pagesDomain, cachePath string, cache *certificates.CertificatesCache, acmeClient *lego.Client, giteaClient *repo.GiteaClient) *tls.Config {
+func MakeTlsConfig(pagesDomain, cachePath string, cache *certificates.CertificatesCache, acmeClient *lego.Client, ctx *context.GlobalContext) *tls.Config {
 	return &tls.Config{
 		GetCertificate: func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
 			// Validate that we should even care about this domain
@@ -99,7 +100,7 @@ func MakeTlsConfig(pagesDomain, cachePath string, cache *certificates.Certificat
 				if cert.IsValid() {
 					return cert.TlsCertificate, nil
 				} else {
-					if !isPagesDomain && !repo.CanRequestCertificate(username, giteaClient) {
+					if !isPagesDomain && !repo.CanRequestCertificate(username, ctx) {
 						log.Warnf(
 							"Cannot renew certificate for %s because CanRequestCertificate(%s) returned false",
 							info.ServerName,
@@ -128,7 +129,7 @@ func MakeTlsConfig(pagesDomain, cachePath string, cache *certificates.Certificat
 					return newCert.TlsCertificate, nil
 				}
 			} else {
-				if !isPagesDomain && !repo.CanRequestCertificate(username, giteaClient) {
+				if !isPagesDomain && !repo.CanRequestCertificate(username, ctx) {
 					log.Warnf(
 						"Cannot request certificate for %s because CanRequestCertificate(%s) returned false",
 						info.ServerName,