96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
package mailer
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import (
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"embed"
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"errors"
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"io/fs"
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"strings"
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"text/template"
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)
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const EMAIL_FS_PREFIX = "templates"
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const TPL_PASSWORD_RESET = "password_reset.tpl"
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const TPL_VERIFY_EMAIL = "verify_email.tpl"
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type EmailTemplate struct {
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Subject *template.Template
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Body *template.Template
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}
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//go:embed templates/*
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var templateFS embed.FS
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var ErrTemplateNotFound = errors.New("template not found")
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type TemplateRegistry struct {
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templates map[string]EmailTemplate
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}
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func NewTemplateRegistry() *TemplateRegistry {
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return &TemplateRegistry{
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templates: make(map[string]EmailTemplate),
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}
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}
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func (tr *TemplateRegistry) loadTemplates() error {
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subjectTemplates, err := fs.Glob(templateFS, EMAIL_FS_PREFIX+"*_subject*")
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if err != nil {
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return err
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}
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for _, subjectTemplate := range subjectTemplates {
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templateName := strings.TrimSuffix(strings.TrimPrefix(subjectTemplate, EMAIL_FS_PREFIX), "_subject.tpl")
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bodyTemplate := strings.TrimSuffix(subjectTemplate, "_subject.tpl") + "_body.tpl"
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subjectContent, err := fs.ReadFile(templateFS, templateName+"_subject.tpl")
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if err != nil {
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return err
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}
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subjectTmpl, err := template.New(templateName).Parse(string(subjectContent))
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if err != nil {
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return err
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}
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bodyContent, err := fs.ReadFile(templateFS, bodyTemplate)
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if err != nil {
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return err
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}
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bodyTmpl, err := template.New(templateName).Parse(string(bodyContent))
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if err != nil {
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return err
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}
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tr.templates[templateName] = EmailTemplate{
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Subject: subjectTmpl,
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Body: bodyTmpl,
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}
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}
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return nil
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}
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func (tr *TemplateRegistry) RenderTemplate(templateName string, subjectVars TemplateData, bodyVars TemplateData) (*Email, error) {
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tmpl, ok := tr.templates[templateName]
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if !ok {
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return nil, ErrTemplateNotFound
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}
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var subjectBuilder strings.Builder
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err := tmpl.Subject.Execute(&subjectBuilder, subjectVars)
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if err != nil {
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return nil, err
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}
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var bodyBuilder strings.Builder
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err = tmpl.Body.Execute(&bodyBuilder, bodyVars)
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if err != nil {
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return nil, err
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}
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return NewEmail(subjectBuilder.String(), bodyBuilder.String()), nil
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}
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