feat: allow ENDPOINT_URI/COOKIE_DOMAIN to be unset, default to Host: …

…header

In some environments a website will have more than one domain name, serving
the same content. This makes it impossible to set ENDPOINT_URI/COOKIE_DOMAIN
as server environment variables.

If ENDPOINT_URI is unset, use Host: header in its place. Update cache
path to be qualified by it.

Allow COOKIE_DOMAIN to be unset.

.gitignore

@@ -13,3 +13,9 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+server/.vscode/
+server/__debug_bin
+server/go.sum
+server/server
+

README.md

@@ -70,7 +70,7 @@ docker run \
 |Variable|Description|Example|
 |-----------------|-----|-----|
 |```ENABLE_DEBUG_OUTPUT```|Set this to true to let the proxy print debug details for setting up or debugging.|false|
-|```ENDPOINT_URI```|URI where the proxy will be reachable at.|www.google.com|
+|```ENDPOINT_URI```|URI where the proxy will be reachable at. If not present, will use `Host` header.|www.google.com|
 |```JS_SUBDIRECTORY```|It is intended to serve the javascript files within a subdirectory of the URI. Here you can define a name for it.|js|
 |```HTML_SUBDIRECTORY```|It is intended to serve the html files (like the GTM iframe) within a subdirectory of the URI. Here you can define a name for it.|html|
 |```GA_CACHE_TIME```|Time in seconds the proxy caches the Google Analytics client javascript.|3600|
@@ -91,7 +91,7 @@ docker run \
 |```ENABLE_SERVER_SIDE_GA_COOKIES```|If the proxy should transfer the client id to a serverside cookie, set this to true.|true|
 |```GA_SERVER_SIDE_COOKIE```|Set the cookie name for the serverside cookie.|_gggp|
 |```GA_CLIENT_SIDE_COOKIE```|Set the cookie name for the clientside cookie, where google analytics will take the client id from.|_ga|
-|```COOKIE_DOMAIN```|The [domain](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#Attributes) where the cookies are setup to.|google.com|
+|```COOKIE_DOMAIN```|The [domain](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#Attributes) where the cookies are setup to. If not present, use the `Host` header.|google.com|
 |```COOKIE_SECURE```|If your website is accessable through https://, you should set this variable to true. [More info](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#Secure)|true|
 
 
@@ -278,4 +278,4 @@ If you found this repo useful, please consider a donation. Thank You!
 
 [Bitcoin: 131AUMEDiAFHakkLHnvhYgvunKR6d38kZx](https://www.blockchain.com/btc/address/131AUMEDiAFHakkLHnvhYgvunKR6d38kZx)
 
-[Ethereum: 0x9eB04Daf33DEF7dec2f5D454D1c63c020aBe8D8f](https://www.blockchain.com/eth/address/0x9eB04Daf33DEF7dec2f5D454D1c63c020aBe8D8f)
+[Ethereum: 0x9eB04Daf33DEF7dec2f5D454D1c63c020aBe8D8f](https://www.blockchain.com/eth/address/0x9eB04Daf33DEF7dec2f5D454D1c63c020aBe8D8f)

server/ga.go

@@ -40,15 +40,26 @@ func googleAnalyticsJsHandle(w http.ResponseWriter, r *http.Request, path string
 	var statusCodeToReturn int = 200
 	var headersToReturn http.Header
 	var usedCache bool
+	var endpointURI = settingsGGGP.EndpointURI
+	var cookieDomain = settingsGGGP.CookieDomain
+	var cachePath = path
 
-	GaCache, CacheExists := srcGaCache[path]
+	if settingsGGGP.EndpointURI == "" {
+		endpointURI = r.Host
+		cachePath = endpointURI + "/" + path
+	}
+	if settingsGGGP.CookieDomain == "" {
+		cookieDomain = r.Host
+	}
+
+	GaCache, CacheExists := srcGaCache[cachePath]
 
 	if CacheExists == false {
 		gaMapSync.Lock()
-		srcGaCache[path] = gaSourceCodeCache{lastUpdate: 0}
+		srcGaCache[cachePath] = gaSourceCodeCache{lastUpdate: 0}
 		gaMapSync.Unlock()
 
-		GaCache, _ = srcGaCache[path]
+		GaCache, _ = srcGaCache[cachePath]
 	}
 
 	if settingsGGGP.EnableDebugOutput {
@@ -138,13 +149,13 @@ func googleAnalyticsJsHandle(w http.ResponseWriter, r *http.Request, path string
 		}
 
 		re := regexp.MustCompile(`googletagmanager.com`)
-		body = re.ReplaceAll([]byte(body), []byte(settingsGGGP.EndpointURI))
+		body = re.ReplaceAll([]byte(body), []byte(endpointURI))
 
 		re = regexp.MustCompile(`\/gtm.js`)
 		body = re.ReplaceAll([]byte(body), []byte(`/`+settingsGGGP.JsSubdirectory+`/`+settingsGGGP.GtmFilename))
 
 		re = regexp.MustCompile(`www.google-analytics.com`)
-		body = re.ReplaceAll([]byte(body), []byte(settingsGGGP.EndpointURI))
+		body = re.ReplaceAll([]byte(body), []byte(endpointURI))
 
 		re = regexp.MustCompile(`analytics.js`)
 		body = re.ReplaceAll([]byte(body), []byte(`/`+settingsGGGP.JsSubdirectory+`/`+settingsGGGP.GaFilename))
@@ -208,7 +219,7 @@ func googleAnalyticsJsHandle(w http.ResponseWriter, r *http.Request, path string
 
 		// Reassigning the copy of the struct back to map
 		gaMapSync.Lock()
-		srcGaCache[path] = GaCache
+		srcGaCache[cachePath] = GaCache
 		gaMapSync.Unlock()
 	}
 
@@ -241,16 +252,16 @@ func googleAnalyticsJsHandle(w http.ResponseWriter, r *http.Request, path string
 
 		if settingsGGGP.CookieSecure {
 			if settingsGGGP.EnableDebugOutput {
-				fmt.Println(`Set-Cookie: ` + settingsGGGP.ServerSideGaCookieName + `=` + newCookieContent + `; Domain=` + settingsGGGP.CookieDomain + `; Secure; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
+				fmt.Println(`Set-Cookie: ` + settingsGGGP.ServerSideGaCookieName + `=` + newCookieContent + `; Domain=` + cookieDomain + `; Secure; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
 			}
-			w.Header().Add(`Set-Cookie`, settingsGGGP.ServerSideGaCookieName+`=`+newCookieContent+`; Domain=`+settingsGGGP.CookieDomain+`; Secure; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
-			w.Header().Add(`Set-Cookie`, settingsGGGP.ClientSideGaCookieName+`=`+newCookieDecodedContent+`; Domain=`+settingsGGGP.CookieDomain+`; Secure; SameSite=Lax; Path=/; Max-Age=63072000`)
+			w.Header().Add(`Set-Cookie`, settingsGGGP.ServerSideGaCookieName+`=`+newCookieContent+`; Domain=`+cookieDomain+`; Secure; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
+			w.Header().Add(`Set-Cookie`, settingsGGGP.ClientSideGaCookieName+`=`+newCookieDecodedContent+`; Domain=`+cookieDomain+`; Secure; SameSite=Lax; Path=/; Max-Age=63072000`)
 		} else {
 			if settingsGGGP.EnableDebugOutput {
-				fmt.Println(`Set-Cookie: ` + settingsGGGP.ServerSideGaCookieName + `=` + newCookieContent + `; Domain=` + settingsGGGP.CookieDomain + `; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
+				fmt.Println(`Set-Cookie: ` + settingsGGGP.ServerSideGaCookieName + `=` + newCookieContent + `; Domain=` + cookieDomain + `; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
 			}
-			w.Header().Add(`Set-Cookie`, settingsGGGP.ServerSideGaCookieName+`=`+newCookieContent+`; Domain=`+settingsGGGP.CookieDomain+`; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
-			w.Header().Add(`Set-Cookie`, settingsGGGP.ClientSideGaCookieName+`=`+newCookieDecodedContent+`; Domain=`+settingsGGGP.CookieDomain+`; SameSite=Lax; Path=/; Max-Age=63072000`)
+			w.Header().Add(`Set-Cookie`, settingsGGGP.ServerSideGaCookieName+`=`+newCookieContent+`; Domain=`+cookieDomain+`; HttpOnly; SameSite=Lax; Path=/; Max-Age=63072000`)
+			w.Header().Add(`Set-Cookie`, settingsGGGP.ClientSideGaCookieName+`=`+newCookieDecodedContent+`; Domain=`+cookieDomain+`; SameSite=Lax; Path=/; Max-Age=63072000`)
 		}
 	}
 

server/gtm.go

@@ -34,6 +34,11 @@ func googleTagManagerHandle(w http.ResponseWriter, r *http.Request, path string)
 	var statusCodeToReturn int = 200
 	var headersToReturn http.Header
 	var usedCache bool
+	var endpointURI = settingsGGGP.EndpointURI
+
+	if settingsGGGP.EndpointURI == "" {
+		endpointURI = r.Host
+	}
 
 	if innerID, ok := r.URL.Query()[`id`]; ok {
 		if len(innerID[0]) >= 4 {
@@ -63,14 +68,14 @@ func googleTagManagerHandle(w http.ResponseWriter, r *http.Request, path string)
 		}
 	}
 
-	GtmCache, CacheExists := srcGtmCache[GtmContainerID+GtmURLAddition]
+	GtmCache, CacheExists := srcGtmCache[endpointURI+"/"+GtmContainerID+GtmURLAddition]
 
 	if CacheExists == false {
 		gtmMapSync.Lock()
-		srcGtmCache[GtmContainerID+GtmURLAddition] = gtmSourceCodeCache{lastUpdate: 0}
+		srcGtmCache[endpointURI+"/"+GtmContainerID+GtmURLAddition] = gtmSourceCodeCache{lastUpdate: 0}
 		gtmMapSync.Unlock()
 
-		GtmCache, _ = srcGtmCache[GtmContainerID+GtmURLAddition]
+		GtmCache, _ = srcGtmCache[endpointURI+"/"+GtmContainerID+GtmURLAddition]
 	}
 
 	if !isInSlice(settingsGGGP.AllowedGtmIds, r.URL.Query()[`id`][0]) && !isInSlice(settingsGGGP.AllowedGtmIds, r.URL.Query()[`id`][0][4:]) && settingsGGGP.RestrictGtmIds {
@@ -171,16 +176,16 @@ func googleTagManagerHandle(w http.ResponseWriter, r *http.Request, path string)
 		// body = re.ReplaceAll([]byte(body), []byte(settingsGGGP.EndpointURI+`/`+settingsGGGP.JsSubdirectory+`/`+settingsGGGP.GtmAFilename))
 
 		re := regexp.MustCompile(`(www\.)?googletagmanager.com`)
-		body = re.ReplaceAll([]byte(body), []byte(settingsGGGP.EndpointURI))
+		body = re.ReplaceAll([]byte(body), []byte(endpointURI))
 
-		re = regexp.MustCompile(settingsGGGP.EndpointURI + `\/a`)
+		re = regexp.MustCompile(endpointURI + `\/a`)
 		body = re.ReplaceAll([]byte(body), []byte(`www.googletagmanager.com\/a`))
 
 		re = regexp.MustCompile(`\/gtm.js`)
 		body = re.ReplaceAll([]byte(body), []byte(`/`+settingsGGGP.JsSubdirectory+`/`+settingsGGGP.GtmFilename))
 
 		re = regexp.MustCompile(`www.google-analytics.com`)
-		body = re.ReplaceAll([]byte(body), []byte(settingsGGGP.EndpointURI))
+		body = re.ReplaceAll([]byte(body), []byte(endpointURI))
 
 		re = regexp.MustCompile(`(\/)?analytics.js`)
 		body = re.ReplaceAll([]byte(body), []byte(`/`+settingsGGGP.JsSubdirectory+`/`+settingsGGGP.GaFilename))
@@ -233,7 +238,7 @@ func googleTagManagerHandle(w http.ResponseWriter, r *http.Request, path string)
 
 		// Reassigning the copy of the struct back to map
 		gtmMapSync.Lock()
-		srcGtmCache[GtmContainerID+GtmURLAddition] = GtmCache
+		srcGtmCache[endpointURI+"/"+GtmContainerID+GtmURLAddition] = GtmCache
 		gtmMapSync.Unlock()
 	}
 

server/main.go

@@ -101,7 +101,6 @@ func setResponseHeaders(w http.ResponseWriter, headers http.Header) {
 func main() {
 	// Check if required environment variables are set
 	for _, envVar := range [...]string{
-		"ENDPOINT_URI",
 		"JS_SUBDIRECTORY",
 		"GA_PLUGINS_DIRECTORYNAME",
 		"GTM_FILENAME",
@@ -112,7 +111,6 @@ func main() {
 		"GA_COLLECT_ENDPOINT",
 		"GA_COLLECT_REDIRECT_ENDPOINT",
 		"GA_COLLECT_J_ENDPOINT",
-		"COOKIE_DOMAIN",
 	} {
 		if os.Getenv(envVar) == `` {
 			fmt.Println(`ERROR: Seems the required environment variable '` + envVar + `' is missing. Exiting.`)