78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
package pagewriter
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import (
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// Import embed to allow importing default page templates
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_ "embed"
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"fmt"
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"html/template"
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"os"
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"path/filepath"
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"strings"
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"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
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)
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const (
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errorTemplateName = "error.html"
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signInTemplateName = "sign_in.html"
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)
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//go:embed error.html
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var defaultErrorTemplate string
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//go:embed sign_in.html
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var defaultSignInTemplate string
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// loadTemplates adds the Sign In and Error templates from the custom template
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// directory, or uses the defaults if they do not exist or the custom directory
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// is not provided.
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func loadTemplates(customDir string) (*template.Template, error) {
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t := template.New("").Funcs(template.FuncMap{
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"ToUpper": strings.ToUpper,
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"ToLower": strings.ToLower,
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})
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var err error
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t, err = addTemplate(t, customDir, signInTemplateName, defaultSignInTemplate)
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if err != nil {
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return nil, fmt.Errorf("could not add Sign In template: %v", err)
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}
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t, err = addTemplate(t, customDir, errorTemplateName, defaultErrorTemplate)
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if err != nil {
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return nil, fmt.Errorf("could not add Error template: %v", err)
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}
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return t, nil
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}
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// addTemplate will add the template from the custom directory if provided,
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// else it will add the default template.
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func addTemplate(t *template.Template, customDir, fileName, defaultTemplate string) (*template.Template, error) {
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filePath := filepath.Join(customDir, fileName)
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if customDir != "" && isFile(filePath) {
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t, err := t.ParseFiles(filePath)
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if err != nil {
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return nil, fmt.Errorf("failed to parse template %s: %v", filePath, err)
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}
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return t, nil
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}
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t, err := t.Parse(defaultTemplate)
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if err != nil {
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// This should not happen.
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// Default templates should be tested and so should never fail to parse.
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logger.Panic("Could not parse defaultTemplate: ", err)
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}
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return t, nil
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}
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// isFile checks if the file exists and checks whether it is a regular file.
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// If either of these fail then it cannot be used as a template file.
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func isFile(fileName string) bool {
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info, err := os.Stat(fileName)
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if err != nil {
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logger.Errorf("Could not load file %s: %v, will use default template", fileName, err)
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return false
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}
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return info.Mode().IsRegular()
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}
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