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confidentiality_index.go
166 lines (141 loc) · 4.49 KB
/
confidentiality_index.go
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package confindex
import (
"html/template"
"log"
"net/http"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/pkg/errors"
"github.com/toowoxx/caddy2-html-injection-plugin"
"go.uber.org/zap"
"github.com/toowoxx/caddy2-confidentiality-index-plugin/embedded"
)
var tpl *template.Template
type TemplateOptions struct {
Confidentiality string
ConfidentialityDocLink string
}
var textToInject string
func init() {
caddy.RegisterModule(Middleware{})
httpcaddyfile.RegisterHandlerDirective("confidentiality", parseCaddyfile)
httpcaddyfile.RegisterGlobalOption("confidentiality_doc_link", unmarshalDocLink)
var err error
tpl, err = template.New("html").Parse(embedded.ConfidentialityIndexHtml)
if err != nil {
log.Fatal(errors.Wrap(err, "could not parse template"))
}
}
type Middleware struct {
ConfidentialityStr string `json:"confidentiality"`
Confidentiality Confidentiality
injectedWriter *injection.InjectedWriter
injectionMiddleware *injection.Middleware
logger *zap.Logger
}
var documentationLink string
func (Middleware) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.confidentiality",
New: func() caddy.Module { return new(Middleware) },
}
}
func (m *Middleware) Provision(ctx caddy.Context) error {
m.logger = ctx.Logger(m)
m.logger.Info("Provisioning confidentiality index plugin",
zap.String("ConfidentialityStr", m.ConfidentialityStr),
zap.String("documentationLink", documentationLink),
)
m.injectionMiddleware = &injection.Middleware{
ContentType: "text/html",
// Not necessary as we will be using a custom LineHandler
Inject: "",
Before: "</body>",
Logger: m.logger,
}
return m.injectionMiddleware.Provision(ctx)
}
func (m *Middleware) Validate() error {
confidentiality, err := ToConfidentiality(m.ConfidentialityStr)
if err != nil {
return errors.Wrap(err, "confidentiality index validation error")
}
m.Confidentiality = confidentiality
var strBuf strings.Builder
err = tpl.Execute(&strBuf, &TemplateOptions{
Confidentiality: m.Confidentiality.ToScriptKey(),
ConfidentialityDocLink: documentationLink,
})
if err != nil {
return errors.Wrap(err, "could not execute template")
}
textToInject = strBuf.String()
return m.injectionMiddleware.Validate()
}
func (m Middleware) HandleLine(line string) (string, error) {
if strings.Contains(line, m.injectedWriter.M.Before) {
textToInject := m.injectedWriter.HandleCSPForText(textToInject)
return strings.Replace(line, m.injectedWriter.M.Before, textToInject+m.injectedWriter.M.Before, 1), nil
}
return line, nil
}
func (m Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
if m.injectionMiddleware.ShouldBypassForRequest(w, r) {
return next.ServeHTTP(w, r)
}
r.Header.Set("Accept-Encoding", "identity")
injectedWriter := injection.CreateInjectedWriter(w, r, m.injectionMiddleware)
m.injectedWriter = injectedWriter
injectedWriter.LineHandler = m
err := next.ServeHTTP(injectedWriter, r)
if err != nil {
return err
}
if err := injectedWriter.Flush(); err != nil {
return err
}
return nil
}
func (m *Middleware) unmarshalConfidentialityDir(d *caddyfile.Dispenser) error {
if !d.Next() {
return d.Err("expected token following confidentiality")
}
if !d.NextArg() {
return d.Err("expected argument for confidentiality")
}
value := d.Val()
if len(value) == 0 {
return d.Err("expected confidentiality classification after 'confidentiality' token")
}
m.ConfidentialityStr = value
return nil
}
func unmarshalDocLink(d *caddyfile.Dispenser, _ interface{}) (interface{}, error) {
if !d.Next() {
return nil, d.Err("expected token following confidentiality_doc_link")
}
if !d.NextArg() {
return nil, d.Err("expected argument for confidentiality_doc_link")
}
value := d.Val()
if len(value) == 0 {
return nil, d.Err("expected string after 'confidentiality_doc_link' token")
}
documentationLink = value
return value, nil
}
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var m Middleware
err := m.unmarshalConfidentialityDir(h.Dispenser)
return m, err
}
// Interface guards
var (
_ caddy.Provisioner = (*Middleware)(nil)
_ caddy.Validator = (*Middleware)(nil)
_ caddyhttp.MiddlewareHandler = (*Middleware)(nil)
_ injection.LineHandler = (*Middleware)(nil)
)