115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
package core
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import (
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"html/template"
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"net/http"
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"strings"
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"github.com/kirsle/blog/core/forms"
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"github.com/kirsle/blog/core/models/settings"
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"github.com/kirsle/blog/core/models/users"
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)
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// Vars is an interface to implement by the templates to pass their own custom
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// variables in. It auto-loads global template variables (site name, etc.)
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// when the template is rendered.
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type Vars struct {
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// Global template variables.
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SetupNeeded bool
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Title string
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Path string
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LoggedIn bool
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CurrentUser *users.User
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// Common template variables.
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Message string
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Flash string
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Error error
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Data map[interface{}]interface{}
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Form forms.Form
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}
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// NewVars initializes a Vars struct with the custom Data map initialized.
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// You may pass in an initial value for this map if you want.
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func NewVars(data ...map[interface{}]interface{}) *Vars {
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var value map[interface{}]interface{}
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if len(data) > 0 {
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value = data[0]
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} else {
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value = make(map[interface{}]interface{})
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}
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return &Vars{
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Data: value,
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}
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}
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// LoadDefaults combines template variables with default, globally available vars.
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func (v *Vars) LoadDefaults(r *http.Request) {
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// Get the site settings.
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s, err := settings.Load()
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if err != nil {
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s = settings.Defaults()
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}
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if s.Initialized == false && !strings.HasPrefix(r.URL.Path, "/initial-setup") {
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v.SetupNeeded = true
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}
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v.Title = s.Site.Title
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v.Path = r.URL.Path
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ctx := r.Context()
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if user, ok := ctx.Value(userKey).(*users.User); ok {
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if user.ID > 0 {
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v.LoggedIn = true
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v.CurrentUser = user
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}
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}
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}
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// TemplateVars is an interface that describes the template variable struct.
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type TemplateVars interface {
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LoadDefaults(*http.Request)
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}
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// RenderTemplate responds with an HTML template.
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func (b *Blog) RenderTemplate(w http.ResponseWriter, r *http.Request, path string, vars TemplateVars) error {
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// Get the layout template.
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layout, err := b.ResolvePath(".layout")
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if err != nil {
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log.Error("RenderTemplate(%s): layout template not found", path)
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return err
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}
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// And the template in question.
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filepath, err := b.ResolvePath(path)
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if err != nil {
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log.Error("RenderTemplate(%s): file not found", path)
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return err
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}
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// Parse the template files. The layout comes first because it's the wrapper
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// and allows the filepath template to set the page title.
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t, err := template.ParseFiles(layout.Absolute, filepath.Absolute)
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if err != nil {
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log.Error(err.Error())
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return err
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}
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// Inject globally available variables.
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if vars == nil {
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vars = &Vars{}
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}
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vars.LoadDefaults(r)
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w.Header().Set("Content-Type", "text/html; encoding=UTF-8")
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err = t.ExecuteTemplate(w, "layout", vars)
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if err != nil {
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log.Error("Template parsing error: %s", err)
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return err
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}
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log.Debug("Parsed template")
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return nil
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}
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