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|
package controller
import (
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
glecho "code.crute.us/mcrute/golib/echo"
"github.com/labstack/echo/v4"
)
type FeatureFlags struct {
flags map[string]bool
}
func NewFeatureFlags() *FeatureFlags {
return &FeatureFlags{map[string]bool{}}
}
func (f *FeatureFlags) Need(feature string) string {
f.flags[feature] = true
return ""
}
func (f *FeatureFlags) Needs(feature string) bool {
v, ok := f.flags[feature]
return ok && v
}
type PageContext struct {
c map[string]string
}
func NewPageContext() *PageContext {
return &PageContext{map[string]string{}}
}
func (c *PageContext) HasKey(key string) bool {
_, ok := c.c[key]
return ok
}
func (c *PageContext) Set(key, value string) string {
c.c[key] = value
return ""
}
func (c *PageContext) Get(key string) string {
return c.c[key]
}
type GenericTemplateHandler struct {
Render func(echo.Context) (interface{}, error)
cb string
init sync.Once
cbm sync.Mutex // Should only be used in Debug
}
func (h *GenericTemplateHandler) TmplMakeCacheBustUrl(su string) (string, error) {
u, err := url.Parse(su)
if err != nil {
return "", err
}
q := u.Query()
q.Add("cb", h.cb)
u.RawQuery = q.Encode()
return u.String(), nil
}
func (h *GenericTemplateHandler) canonicalizeUrl(c echo.Context, tr glecho.TemplateChecker) string {
path := strings.Trim(c.Request().URL.Path, "/")
if path == "" {
path = "index.tpl"
} else if !strings.HasSuffix(path, ".html") {
p := fmt.Sprintf("%s.tpl", path)
if !tr.HaveTemplate(c, p) {
path = fmt.Sprintf("%s/index.tpl", path)
} else {
path = p
}
} else {
path = strings.ReplaceAll(path, ".html", ".tpl")
}
return path
}
func (h *GenericTemplateHandler) Handle(c echo.Context) error {
// Generate the cache-buster only once at first request
h.init.Do(func() {
h.cb = strconv.FormatInt(time.Now().Unix(), 16)
})
// If in debug mode use a new cache buster every time to make reloading
// assets easier
if c.Echo().Debug {
h.cbm.Lock()
h.cb = strconv.FormatInt(time.Now().Unix(), 16)
h.cbm.Unlock()
}
tr, ok := c.Echo().Renderer.(glecho.TemplateChecker)
if !ok {
// The only reason this should happen is if the app is wired wrong
panic("Template renderer must implement TemplateChecker")
}
path := h.canonicalizeUrl(c, tr)
c.Set("CanonicalPath", path)
data, err := h.Render(c)
if err != nil {
return err
}
return c.Render(http.StatusOK, path, data)
}
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