/
item.go
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/
item.go
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// Package item provides the default functionality to Ponzu's content/data types,
// how they interact with the API, and how to override or enhance their abilities
// using various interfaces.
package item
import (
"fmt"
"net/http"
"regexp"
"strings"
"unicode"
"github.com/blevesearch/bleve"
"github.com/blevesearch/bleve/mapping"
uuid "github.com/satori/go.uuid"
"golang.org/x/text/transform"
"golang.org/x/text/unicode/norm"
)
// Sluggable makes a struct locatable by URL with it's own path.
// As an Item implementing Sluggable, slugs may overlap. If this is an issue,
// make your content struct (or one which embeds Item) implement Sluggable
// and it will override the slug created by Item's SetSlug with your own
type Sluggable interface {
SetSlug(string)
ItemSlug() string
}
// Identifiable enables a struct to have its ID set/get. Typically this is done
// to set an ID to -1 indicating it is new for DB inserts, since by default
// a newly initialized struct would have an ID of 0, the int zero-value, and
// BoltDB's starting key per bucket is 0, thus overwriting the first record.
type Identifiable interface {
ItemID() int
SetItemID(int)
UniqueID() uuid.UUID
String() string
}
// Sortable ensures data is sortable by time
type Sortable interface {
Time() int64
Touch() int64
}
// Hookable provides our user with an easy way to intercept or add functionality
// to the different lifecycles/events a struct may encounter. Item implements
// Hookable with no-ops so our user can override only whichever ones necessary.
type Hookable interface {
BeforeAPICreate(http.ResponseWriter, *http.Request) error
AfterAPICreate(http.ResponseWriter, *http.Request) error
BeforeAPIUpdate(http.ResponseWriter, *http.Request) error
AfterAPIUpdate(http.ResponseWriter, *http.Request) error
BeforeAPIDelete(http.ResponseWriter, *http.Request) error
AfterAPIDelete(http.ResponseWriter, *http.Request) error
BeforeSave(http.ResponseWriter, *http.Request) error
AfterSave(http.ResponseWriter, *http.Request) error
BeforeDelete(http.ResponseWriter, *http.Request) error
AfterDelete(http.ResponseWriter, *http.Request) error
BeforeApprove(http.ResponseWriter, *http.Request) error
AfterApprove(http.ResponseWriter, *http.Request) error
BeforeReject(http.ResponseWriter, *http.Request) error
AfterReject(http.ResponseWriter, *http.Request) error
}
// Hideable lets a user keep items hidden
type Hideable interface {
Hide(http.ResponseWriter, *http.Request) error
}
// Pushable lets a user define which values of certain struct fields are
// 'pushed' down to a client via HTTP/2 Server Push. All items in the slice
// should be the json tag names of the struct fields to which they correspond.
type Pushable interface {
// the values contained by fields returned by Push must strictly be URL paths
Push() []string
}
// Omittable lets a user define certin fields within a content struct to remove
// from an API response. Helpful when you want data in the CMS, but not entirely
// shown or available from the content API. All items in the slice should be the
// json tag names of the struct fields to which they correspond.
type Omittable interface {
Omit() []string
}
// Item should only be embedded into content type structs.
type Item struct {
UUID uuid.UUID `json:"uuid"`
ID int `json:"id"`
Slug string `json:"slug"`
Timestamp int64 `json:"timestamp"`
Updated int64 `json:"updated"`
}
// Time partially implements the Sortable interface
func (i Item) Time() int64 {
return i.Timestamp
}
// Touch partially implements the Sortable interface
func (i Item) Touch() int64 {
return i.Updated
}
// SetSlug sets the item's slug for its URL
func (i *Item) SetSlug(slug string) {
i.Slug = slug
}
// ItemSlug sets the item's slug for its URL
func (i *Item) ItemSlug() string {
return i.Slug
}
// ItemID gets the Item's ID field
// partially implements the Identifiable interface
func (i Item) ItemID() int {
return i.ID
}
// SetItemID sets the Item's ID field
// partially implements the Identifiable interface
func (i *Item) SetItemID(id int) {
i.ID = id
}
// UniqueID gets the Item's UUID field
// partially implements the Identifiable interface
func (i Item) UniqueID() uuid.UUID {
return i.UUID
}
// String formats an Item into a printable value
// partially implements the Identifiable interface
func (i Item) String() string {
return fmt.Sprintf("Item ID: %s", i.UniqueID())
}
// BeforeAPICreate is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeAPICreate(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterAPICreate is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterAPICreate(res http.ResponseWriter, req *http.Request) error {
return nil
}
// BeforeAPIUpdate is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeAPIUpdate(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterAPIUpdate is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterAPIUpdate(res http.ResponseWriter, req *http.Request) error {
return nil
}
// BeforeAPIDelete is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeAPIDelete(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterAPIDelete is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterAPIDelete(res http.ResponseWriter, req *http.Request) error {
return nil
}
// BeforeSave is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeSave(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterSave is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterSave(res http.ResponseWriter, req *http.Request) error {
return nil
}
// BeforeDelete is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeDelete(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterDelete is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterDelete(res http.ResponseWriter, req *http.Request) error {
return nil
}
// BeforeApprove is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeApprove(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterApprove is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterApprove(res http.ResponseWriter, req *http.Request) error {
return nil
}
// BeforeReject is a no-op to ensure structs which embed Item implement Hookable
func (i Item) BeforeReject(res http.ResponseWriter, req *http.Request) error {
return nil
}
// AfterReject is a no-op to ensure structs which embed Item implement Hookable
func (i Item) AfterReject(res http.ResponseWriter, req *http.Request) error {
return nil
}
// SearchMapping returns a default implementation of a Bleve IndexMappingImpl
// partially implements search.Searchable
func (i Item) SearchMapping() (*mapping.IndexMappingImpl, error) {
mapping := bleve.NewIndexMapping()
mapping.StoreDynamic = false
return mapping, nil
}
// IndexContent determines if a type should be indexed for searching
// partially implements search.Searchable
func (i Item) IndexContent() bool {
return false
}
// Slug returns a URL friendly string from the title of a post item
func Slug(i Identifiable) (string, error) {
// get the name of the post item
name := strings.TrimSpace(i.String())
// filter out non-alphanumeric character or non-whitespace
slug, err := stringToSlug(name)
if err != nil {
return "", err
}
return slug, nil
}
func isMn(r rune) bool {
return unicode.Is(unicode.Mn, r) // Mn: nonspacing marks
}
// modified version of: https://www.socketloop.com/tutorials/golang-format-strings-to-seo-friendly-url-example
func stringToSlug(s string) (string, error) {
src := []byte(strings.ToLower(s))
// convert all spaces to dash
rx := regexp.MustCompile("[[:space:]]")
src = rx.ReplaceAll(src, []byte("-"))
// remove all blanks such as tab
rx = regexp.MustCompile("[[:blank:]]")
src = rx.ReplaceAll(src, []byte(""))
rx = regexp.MustCompile("[!/:-@[-`{-~]")
src = rx.ReplaceAll(src, []byte(""))
rx = regexp.MustCompile("/[^\x20-\x7F]/")
src = rx.ReplaceAll(src, []byte(""))
rx = regexp.MustCompile("`&(amp;)?#?[a-z0-9]+;`i")
src = rx.ReplaceAll(src, []byte("-"))
rx = regexp.MustCompile("`&([a-z])(acute|uml|circ|grave|ring|cedil|slash|tilde|caron|lig|quot|rsquo);`i")
src = rx.ReplaceAll(src, []byte("\\1"))
rx = regexp.MustCompile("`[^a-z0-9]`i")
src = rx.ReplaceAll(src, []byte("-"))
rx = regexp.MustCompile("`[-]+`")
src = rx.ReplaceAll(src, []byte("-"))
str := strings.Replace(string(src), "'", "", -1)
str = strings.Replace(str, `"`, "", -1)
str = strings.Replace(str, "&", "-", -1)
t := transform.Chain(norm.NFD, transform.RemoveFunc(isMn), norm.NFC)
slug, _, err := transform.String(t, str)
if err != nil {
return "", err
}
return strings.TrimSpace(slug), nil
}
// NormalizeString removes and replaces illegal characters for URLs and other
// path entities. Useful for taking user input and converting it for keys or URLs.
func NormalizeString(s string) (string, error) {
return stringToSlug(s)
}