feat: customizable static assets (#2597)

* feat: customizable static assets

This change provides the means to override specific assets from the embedded Go FS with files situated on disk.

We only allow overriding the following files currently:
* favicon.ico
* logo.png

* refactor(server): make logo string a const

* refactor(suites): override favicon and use ntp3 in traefik2 suite

* test(suites): test logo override in traefik2 suite

* test(suites): test asset override fallback in traefik suite

Closes #1630.

config.template.yml

@@ -7,7 +7,7 @@
 ## Certificates directory specifies where Authelia will load trusted certificates (public portion) from in addition to
 ## the system certificates store.
 ## They should be in base64 format, and have one of the following extensions: *.cer, *.crt, *.pem.
-# certificates_directory: /config/certificates
+# certificates_directory: /config/certificates/
 
 ## The theme to display: light, dark, grey, auto.
 theme: light
@@ -40,6 +40,10 @@ server:
   ## Must be alphanumeric chars and should not contain any slashes.
   path: ""
 
+  ## Set the path on disk to Authelia assets.
+  ## Useful to allow overriding of specific static assets.
+  # asset_path: /config/assets/
+
   ## Buffers usually should be configured to be the same value.
   ## Explanation at https://www.authelia.com/docs/configuration/server.html
   ## Read buffer size adjusts the server's max incoming request size in bytes.

docs/configuration/server.md

@@ -87,6 +87,33 @@ server:
   path: authelia
 ```
 
+### asset_path
+<div markdown="1">
+type: string 
+{: .label .label-config .label-purple } 
+default: ""
+{: .label .label-config .label-blue }
+required: no
+{: .label .label-config .label-green }
+</div>
+
+Authelia by default serves all static assets from an embedded filesystem in the Go binary.
+
+Modifying this setting will allow you to override and serve specific assets for Authelia from a specified path.
+All files that can be overridden are documented below and must be placed in the `asset_path` with a flat file structure.
+
+Example:
+```console
+/config/assets/
+├── favicon.ico
+└── logo.png
+```
+
+|Asset  |File name|
+|:-----:|:---------------:|
+|Favicon|favicon.ico      |
+|Logo   |logo.png         |
+
 ### read_buffer_size
 <div markdown="1">
 type: integer 
@@ -189,3 +216,8 @@ The path to the public certificate for TLS connections. Must be in DER base64/PE
 The read and write buffer sizes generally should be the same. This is because when Authelia verifies
 if the user is authorized to visit a URL, it also sends back nearly the same size response as the request. However
 you're able to tune these individually depending on your needs.
+
+### Asset Overrides
+
+If replacing the Logo for your Authelia portal it is recommended to upload a transparent PNG of your desired logo.
+Authelia will automatically resize the logo to an appropriate size to present in the frontend.

internal/configuration/config.template.yml

@@ -7,7 +7,7 @@
 ## Certificates directory specifies where Authelia will load trusted certificates (public portion) from in addition to
 ## the system certificates store.
 ## They should be in base64 format, and have one of the following extensions: *.cer, *.crt, *.pem.
-# certificates_directory: /config/certificates
+# certificates_directory: /config/certificates/
 
 ## The theme to display: light, dark, grey, auto.
 theme: light
@@ -40,6 +40,10 @@ server:
   ## Must be alphanumeric chars and should not contain any slashes.
   path: ""
 
+  ## Set the path on disk to Authelia assets.
+  ## Useful to allow overriding of specific static assets.
+  # asset_path: /config/assets/
+
   ## Buffers usually should be configured to be the same value.
   ## Explanation at https://www.authelia.com/docs/configuration/server.html
   ## Read buffer size adjusts the server's max incoming request size in bytes.

internal/configuration/schema/server.go

@@ -5,6 +5,7 @@ type ServerConfiguration struct {
 	Host               string `koanf:"host"`
 	Port               int    `koanf:"port"`
 	Path               string `koanf:"path"`
+	AssetPath          string `koanf:"asset_path"`
 	ReadBufferSize     int    `koanf:"read_buffer_size"`
 	WriteBufferSize    int    `koanf:"write_buffer_size"`
 	EnablePprof        bool   `koanf:"enable_endpoint_pprof"`

internal/configuration/validator/const.go

@@ -147,6 +147,7 @@ var ValidKeys = []string{
 	"server.read_buffer_size",
 	"server.write_buffer_size",
 	"server.path",
+	"server.asset_path",
 	"server.enable_pprof",
 	"server.enable_expvars",
 	"server.disable_healthcheck",

internal/middlewares/asset_override.go

@@ -0,0 +1,29 @@
+package middlewares
+
+import (
+	"os"
+	"strings"
+
+	"github.com/valyala/fasthttp"
+
+	"github.com/authelia/authelia/v4/internal/utils"
+)
+
+// AssetOverrideMiddleware allows overriding and serving of specific embedded assets from disk.
+func AssetOverrideMiddleware(assetPath string, next fasthttp.RequestHandler) fasthttp.RequestHandler {
+	return func(ctx *fasthttp.RequestCtx) {
+		uri := string(ctx.RequestURI())
+		file := uri[strings.LastIndex(uri, "/")+1:]
+
+		if assetPath != "" && utils.IsStringInSlice(file, validOverrideAssets) {
+			_, err := os.Stat(assetPath + file)
+			if err != nil {
+				next(ctx)
+			} else {
+				fasthttp.FSHandler(assetPath, strings.Count(uri, "/")-1)(ctx)
+			}
+		} else {
+			next(ctx)
+		}
+	}
+}

internal/middlewares/const.go

@@ -29,3 +29,4 @@ const (
 )
 
 var protoHostSeparator = []byte("://")
+var validOverrideAssets = []string{"favicon.ico", "logo.png"}

internal/server/const.go

@@ -1,9 +1,14 @@
 package server
 
-const embeddedAssets = "public_html/"
-const swaggerAssets = embeddedAssets + "api/"
-const apiFile = "openapi.yml"
-const indexFile = "index.html"
+const (
+	embeddedAssets = "public_html/"
+	swaggerAssets  = embeddedAssets + "api/"
+	apiFile        = "openapi.yml"
+	indexFile      = "index.html"
+	logoFile       = "logo.png"
+)
+
+var rootFiles = []string{"favicon.ico", "manifest.json", "robots.txt"}
 
 const dev = "dev"
 

internal/server/server.go

@@ -32,13 +32,12 @@ func registerRoutes(configuration schema.Configuration, providers middlewares.Pr
 
 	embeddedPath, _ := fs.Sub(assets, "public_html")
 	embeddedFS := fasthttpadaptor.NewFastHTTPHandler(http.FileServer(http.FS(embeddedPath)))
-	rootFiles := []string{"favicon.ico", "manifest.json", "robots.txt"}
 
 	https := configuration.Server.TLS.Key != "" && configuration.Server.TLS.Certificate != ""
 
-	serveIndexHandler := ServeTemplatedFile(embeddedAssets, indexFile, rememberMe, resetPassword, configuration.Session.Name, configuration.Theme, https)
-	serveSwaggerHandler := ServeTemplatedFile(swaggerAssets, indexFile, rememberMe, resetPassword, configuration.Session.Name, configuration.Theme, https)
-	serveSwaggerAPIHandler := ServeTemplatedFile(swaggerAssets, apiFile, rememberMe, resetPassword, configuration.Session.Name, configuration.Theme, https)
+	serveIndexHandler := ServeTemplatedFile(embeddedAssets, indexFile, configuration.Server.AssetPath, rememberMe, resetPassword, configuration.Session.Name, configuration.Theme, https)
+	serveSwaggerHandler := ServeTemplatedFile(swaggerAssets, indexFile, configuration.Server.AssetPath, rememberMe, resetPassword, configuration.Session.Name, configuration.Theme, https)
+	serveSwaggerAPIHandler := ServeTemplatedFile(swaggerAssets, apiFile, configuration.Server.AssetPath, rememberMe, resetPassword, configuration.Session.Name, configuration.Theme, https)
 
 	r := router.New()
 	r.GET("/", serveIndexHandler)
@@ -48,10 +47,10 @@ func registerRoutes(configuration schema.Configuration, providers middlewares.Pr
 	r.GET("/api/"+apiFile, serveSwaggerAPIHandler)
 
 	for _, f := range rootFiles {
-		r.GET("/"+f, embeddedFS)
+		r.GET("/"+f, middlewares.AssetOverrideMiddleware(configuration.Server.AssetPath, embeddedFS))
 	}
 
-	r.GET("/static/{filepath:*}", embeddedFS)
+	r.GET("/static/{filepath:*}", middlewares.AssetOverrideMiddleware(configuration.Server.AssetPath, embeddedFS))
 	r.ANY("/api/{filepath:*}", embeddedFS)
 
 	r.GET("/api/health", autheliaMiddleware(handlers.HealthGet))

internal/server/template.go

@@ -16,7 +16,7 @@ import (
 // ServeTemplatedFile serves a templated version of a specified file,
 // this is utilised to pass information between the backend and frontend
 // and generate a nonce to support a restrictive CSP while using material-ui.
-func ServeTemplatedFile(publicDir, file, rememberMe, resetPassword, session, theme string, https bool) fasthttp.RequestHandler {
+func ServeTemplatedFile(publicDir, file, assetPath, rememberMe, resetPassword, session, theme string, https bool) fasthttp.RequestHandler {
 	logger := logging.Logger()
 
 	f, err := assets.Open(publicDir + file)
@@ -40,6 +40,14 @@ func ServeTemplatedFile(publicDir, file, rememberMe, resetPassword, session, the
 			base = baseURL.(string)
 		}
 
+		logoOverride := "false"
+
+		if assetPath != "" {
+			if _, err := os.Stat(assetPath + logoFile); err == nil {
+				logoOverride = "true"
+			}
+		}
+
 		var scheme = "https"
 
 		if !https {
@@ -71,7 +79,7 @@ func ServeTemplatedFile(publicDir, file, rememberMe, resetPassword, session, the
 			ctx.Response.Header.Add("Content-Security-Policy", fmt.Sprintf("default-src 'self' ; object-src 'none'; style-src 'self' 'nonce-%s'", nonce))
 		}
 
-		err := tmpl.Execute(ctx.Response.BodyWriter(), struct{ Base, BaseURL, CSPNonce, RememberMe, ResetPassword, Session, Theme string }{Base: base, BaseURL: baseURL, CSPNonce: nonce, RememberMe: rememberMe, ResetPassword: resetPassword, Session: session, Theme: theme})
+		err := tmpl.Execute(ctx.Response.BodyWriter(), struct{ Base, BaseURL, CSPNonce, LogoOverride, RememberMe, ResetPassword, Session, Theme string }{Base: base, BaseURL: baseURL, CSPNonce: nonce, LogoOverride: logoOverride, RememberMe: rememberMe, ResetPassword: resetPassword, Session: session, Theme: theme})
 		if err != nil {
 			ctx.Error("an error occurred", 503)
 			logger.Errorf("Unable to execute template: %v", err)

internal/suites/Traefik/configuration.yml

@@ -7,6 +7,7 @@ jwt_secret: unsecure_secret
 
 server:
   port: 9091
+  asset_path: /config/assets/
   tls:
     certificate: /config/ssl/cert.pem
     key: /config/ssl/key.pem

internal/suites/Traefik2/configuration.yml

@@ -7,6 +7,7 @@ jwt_secret: unsecure_secret
 
 server:
   port: 9091
+  asset_path: /config/assets/
   tls:
     certificate: /config/ssl/cert.pem
     key: /config/ssl/key.pem
@@ -46,6 +47,9 @@ access_control:
     - domain: "singlefactor.example.com"
       policy: one_factor
 
+ntp:
+  version: 3
+
 notifier:
   smtp:
     host: smtp

internal/suites/Traefik2/docker-compose.yml

@@ -5,5 +5,7 @@ services:
     volumes:
       - './Traefik2/configuration.yml:/config/configuration.yml:ro'
       - './Traefik2/users.yml:/config/users.yml'
+      - './Traefik2/favicon.ico:/config/assets/favicon.ico'
+      - './Traefik2/logo.png:/config/assets/logo.png'
       - './common/ssl:/config/ssl:ro'
 ...

web/.env.development

@@ -1,4 +1,5 @@
 VITE_HMR_PORT=8080
+VITE_LOGO_OVERRIDE=false
 VITE_PUBLIC_URL=""
 VITE_REMEMBER_ME=true
 VITE_RESET_PASSWORD=true

web/.env.production

@@ -1,3 +1,4 @@
+VITE_LOGO_OVERRIDE={{.LogoOverride}}
 VITE_PUBLIC_URL={{.Base}}
 VITE_REMEMBER_ME={{.RememberMe}}
 VITE_RESET_PASSWORD={{.ResetPassword}}

web/index.html

@@ -13,7 +13,7 @@
   <title>Login - Authelia</title>
 </head>
 
-<body data-basepath="%VITE_PUBLIC_URL%" data-rememberme="%VITE_REMEMBER_ME%" data-resetpassword="%VITE_RESET_PASSWORD%" data-theme="%VITE_THEME%">
+<body data-basepath="%VITE_PUBLIC_URL%" data-logooverride="%VITE_LOGO_OVERRIDE%" data-rememberme="%VITE_REMEMBER_ME%" data-resetpassword="%VITE_RESET_PASSWORD%" data-theme="%VITE_THEME%">
   <noscript>You need to enable JavaScript to run this app.</noscript>
   <div id="root"></div>
   <script type="module" src="/src/index.tsx"></script>

web/package.json

@@ -56,7 +56,7 @@
           "sourcemap": true
         }
       ],
-      "^.+\\.(css|svg)$": "jest-transform-stub"
+      "^.+\\.(css|png|svg)$": "jest-transform-stub"
     },
     "transformIgnorePatterns": [
       "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs|cjs|ts|tsx)$"

web/src/layouts/LoginLayout.tsx

@@ -4,6 +4,7 @@ import { Grid, makeStyles, Container, Typography, Link } from "@material-ui/core
 import { grey } from "@material-ui/core/colors";
 
 import { ReactComponent as UserSvg } from "@assets/images/user.svg";
+import { getLogoOverride } from "@utils/Configuration";
 
 export interface Props {
     id?: string;
@@ -14,12 +15,17 @@ export interface Props {
 
 const LoginLayout = function (props: Props) {
     const style = useStyles();
+    const logo = getLogoOverride() ? (
+        <img src="./static/media/logo.png" alt="Logo" className={style.icon} />
+    ) : (
+        <UserSvg className={style.icon} />
+    );
     return (
         <Grid id={props.id} className={style.root} container spacing={0} alignItems="center" justifyContent="center">
             <Container maxWidth="xs" className={style.rootContainer}>
                 <Grid container>
                     <Grid item xs={12}>
-                        <UserSvg className={style.icon}></UserSvg>
+                        {logo}
                     </Grid>
                     {props.title ? (
                         <Grid item xs={12}>

web/src/utils/Configuration.ts

@@ -7,6 +7,10 @@ export function getEmbeddedVariable(variableName: string) {
     return value;
 }
 
+export function getLogoOverride() {
+    return getEmbeddedVariable("logooverride") === "true";
+}
+
 export function getRememberMe() {
     return getEmbeddedVariable("rememberme") === "true";
 }