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template.go
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template.go
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package server
import (
"fmt"
"io"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/authelia/authelia/v4/internal/logging"
"github.com/authelia/authelia/v4/internal/middlewares"
"github.com/authelia/authelia/v4/internal/utils"
)
// 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, assetPath, duoSelfEnrollment, rememberMe, resetPassword, resetPasswordCustomURL, session, theme string, https bool) middlewares.RequestHandler {
logger := logging.Logger()
a, err := assets.Open(publicDir + file)
if err != nil {
logger.Fatalf("Unable to open %s: %s", file, err)
}
b, err := io.ReadAll(a)
if err != nil {
logger.Fatalf("Unable to read %s: %s", file, err)
}
tmpl, err := template.New("file").Parse(string(b))
if err != nil {
logger.Fatalf("Unable to parse %s template: %s", file, err)
}
return func(ctx *middlewares.AutheliaCtx) {
base := ""
if baseURL := ctx.UserValueBytes(middlewares.UserValueKeyBaseURL); baseURL != nil {
base = baseURL.(string)
}
logoOverride := f
if assetPath != "" {
if _, err := os.Stat(filepath.Join(assetPath, logoFile)); err == nil {
logoOverride = t
}
}
var scheme = schemeHTTPS
if !https {
proto := string(ctx.XForwardedProto())
switch proto {
case "":
break
case schemeHTTP, schemeHTTPS:
scheme = proto
}
}
baseURL := scheme + "://" + string(ctx.XForwardedHost()) + base + "/"
nonce := utils.RandomString(32, utils.AlphaNumericCharacters, true)
switch extension := filepath.Ext(file); extension {
case ".html":
ctx.SetContentType("text/html; charset=utf-8")
default:
ctx.SetContentType("text/plain; charset=utf-8")
}
switch {
case publicDir == swaggerAssets:
ctx.Response.Header.Add("Content-Security-Policy", fmt.Sprintf("base-uri 'self'; default-src 'self'; img-src 'self' https://validator.swagger.io data:; object-src 'none'; script-src 'self' 'unsafe-inline' 'nonce-%s'; style-src 'self' 'nonce-%s'", nonce, nonce))
case ctx.Configuration.Server.Headers.CSPTemplate != "":
ctx.Response.Header.Add("Content-Security-Policy", strings.ReplaceAll(ctx.Configuration.Server.Headers.CSPTemplate, cspNoncePlaceholder, nonce))
case os.Getenv("ENVIRONMENT") == dev:
ctx.Response.Header.Add("Content-Security-Policy", fmt.Sprintf(cspDefaultTemplate, " 'unsafe-eval'", nonce))
default:
ctx.Response.Header.Add("Content-Security-Policy", fmt.Sprintf(cspDefaultTemplate, "", nonce))
}
err := tmpl.Execute(ctx.Response.BodyWriter(), struct{ Base, BaseURL, CSPNonce, DuoSelfEnrollment, LogoOverride, RememberMe, ResetPassword, ResetPasswordCustomURL, Session, Theme string }{Base: base, BaseURL: baseURL, CSPNonce: nonce, DuoSelfEnrollment: duoSelfEnrollment, LogoOverride: logoOverride, RememberMe: rememberMe, ResetPassword: resetPassword, ResetPasswordCustomURL: resetPasswordCustomURL, Session: session, Theme: theme})
if err != nil {
ctx.RequestCtx.Error("an error occurred", 503)
logger.Errorf("Unable to execute template: %v", err)
return
}
}
}
func writeHealthCheckEnv(disabled bool, scheme, host, path string, port int) (err error) {
if disabled {
return nil
}
_, err = os.Stat("/app/healthcheck.sh")
if err != nil {
return nil
}
_, err = os.Stat("/app/.healthcheck.env")
if err != nil {
return nil
}
file, err := os.OpenFile("/app/.healthcheck.env", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
return err
}
defer func() {
_ = file.Close()
}()
if host == "0.0.0.0" {
host = localhost
} else if strings.Contains(host, ":") {
host = "[" + host + "]"
}
_, err = file.WriteString(fmt.Sprintf(healthCheckEnv, scheme, host, port, path))
return err
}