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package api
import (
"bytes"
"encoding/json"
"log"
"net/http"
"strconv"
"strings"
"github.com/bosssauce/ponzu/content"
"github.com/bosssauce/ponzu/system/api/analytics"
"github.com/bosssauce/ponzu/system/db"
)
func typesHandler(res http.ResponseWriter, req *http.Request) {
var types = []string{}
for t := range content.Types {
types = append(types, string(t))
}
j, err := toJSON(types)
if err != nil {
res.WriteHeader(http.StatusInternalServerError)
return
}
sendData(res, j, http.StatusOK)
}
func contentsHandler(res http.ResponseWriter, req *http.Request) {
q := req.URL.Query()
t := q.Get("type")
if t == "" {
res.WriteHeader(http.StatusBadRequest)
return
}
if _, ok := content.Types[t]; !ok {
res.WriteHeader(http.StatusNotFound)
return
}
count, err := strconv.Atoi(q.Get("count")) // int: determines number of posts to return (10 default, -1 is all)
if err != nil {
if q.Get("count") == "" {
count = 10
} else {
res.WriteHeader(http.StatusInternalServerError)
return
}
}
offset, err := strconv.Atoi(q.Get("offset")) // int: multiplier of count for pagination (0 default)
if err != nil {
if q.Get("offset") == "" {
offset = 0
} else {
res.WriteHeader(http.StatusInternalServerError)
return
}
}
order := strings.ToLower(q.Get("order")) // string: sort order of posts by timestamp ASC / DESC (DESC default)
if order != "asc" {
order = "desc"
}
opts := db.QueryOptions{
Count: count,
Offset: offset,
Order: order,
}
_, bb := db.Query(t+"__sorted", opts)
var result = []json.RawMessage{}
for i := range bb {
result = append(result, bb[i])
}
j, err := fmtJSON(result...)
if err != nil {
res.WriteHeader(http.StatusInternalServerError)
return
}
sendData(res, j, http.StatusOK)
}
func contentHandler(res http.ResponseWriter, req *http.Request) {
q := req.URL.Query()
id := q.Get("id")
t := q.Get("type")
if _, ok := content.Types[t]; !ok {
res.WriteHeader(http.StatusNotFound)
return
}
if t == "" || id == "" {
res.WriteHeader(http.StatusBadRequest)
return
}
post, err := db.Content(t + ":" + id)
if err != nil {
res.WriteHeader(http.StatusInternalServerError)
return
}
j, err := fmtJSON(json.RawMessage(post))
if err != nil {
res.WriteHeader(http.StatusInternalServerError)
return
}
sendData(res, j, http.StatusOK)
}
func fmtJSON(data ...json.RawMessage) ([]byte, error) {
var msg = []json.RawMessage{}
for _, d := range data {
msg = append(msg, d)
}
resp := map[string][]json.RawMessage{
"data": msg,
}
var buf = &bytes.Buffer{}
enc := json.NewEncoder(buf)
err := enc.Encode(resp)
if err != nil {
log.Println("Failed to encode data to JSON:", err)
return nil, err
}
return buf.Bytes(), nil
}
func toJSON(data []string) ([]byte, error) {
var buf = &bytes.Buffer{}
enc := json.NewEncoder(buf)
resp := map[string][]string{
"data": data,
}
err := enc.Encode(resp)
if err != nil {
log.Println("Failed to encode data to JSON:", err)
return nil, err
}
return buf.Bytes(), nil
}
func wrapJSON(json []byte) []byte {
var buf = &bytes.Buffer{}
buf.Write([]byte(`{"data":`))
buf.Write(json)
buf.Write([]byte(`}`))
return buf.Bytes()
}
// sendData() should be used any time you want to communicate
// data back to a foreign client
func sendData(res http.ResponseWriter, data []byte, code int) {
res.Header().Set("Access-Control-Allow-Headers", "Accept, Authorization, Content-Type")
res.Header().Set("Access-Control-Allow-Origin", "*")
res.Header().Set("Content-Type", "application/json")
res.WriteHeader(code)
res.Write(data)
}
// SendPreflight is used to respond to a cross-origin "OPTIONS" request
func SendPreflight(res http.ResponseWriter) {
res.Header().Set("Access-Control-Allow-Headers", "Accept, Authorization, Content-Type")
res.Header().Set("Access-Control-Allow-Origin", "*")
res.WriteHeader(200)
return
}
// SendJSON returns a Response to a client as JSON
func SendJSON(res http.ResponseWriter, j map[string]interface{}) {
var data []byte
var err error
data, err = json.Marshal(j)
if err != nil {
log.Println(err)
data, _ = json.Marshal(map[string]interface{}{
"status": "fail",
"message": err.Error(),
})
}
sendData(res, data, 200)
}
// CORS wraps a HandleFunc to response to OPTIONS requests properly
func CORS(next http.HandlerFunc) http.HandlerFunc {
return db.CacheControl(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
if req.Method == http.MethodOptions {
SendPreflight(res)
return
}
next.ServeHTTP(res, req)
}))
}
// Record wraps a HandleFunc to record API requests for analytical purposes
func Record(next http.HandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
go analytics.Record(req)
next.ServeHTTP(res, req)
})
}
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