100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log"
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"net/http"
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"strings"
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)
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type DispatchFunction func([]string, []byte) (interface{}, error)
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var apiRoutes = map[string]*(map[string]DispatchFunction){
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"version": &ApiVersionRouting,
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"themes": &ApiThemesRouting,
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"teams": &ApiTeamsRouting,
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}
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type apiRouting struct{}
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func ApiHandler() http.Handler {
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return apiRouting{}
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}
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func (a apiRouting) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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log.Printf("Handling %s request from %s: %s [%s]\n", r.Method, r.RemoteAddr, r.URL.Path, r.UserAgent())
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// Extract URL arguments
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var sURL = strings.Split(r.URL.Path, "/")[1:]
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if len(sURL) > 1 && sURL[len(sURL)-1] == "" {
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// Remove trailing /
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sURL = sURL[:len(sURL)-1]
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}
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w.Header().Set("Content-Type", "application/json")
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var ret interface{}
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var err error = nil
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// Read the body
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if r.ContentLength < 0 || r.ContentLength > 6553600 {
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http.Error(w, fmt.Sprintf("{errmsg:\"Request too large or request size unknown\"}", err), http.StatusRequestEntityTooLarge)
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return
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}
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var body []byte
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if r.ContentLength > 0 {
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tmp := make([]byte, 1024)
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for {
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n, err := r.Body.Read(tmp)
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for j := 0; j < n; j++ {
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body = append(body, tmp[j])
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}
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if err != nil || n <= 0 {
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break
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}
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}
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}
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// Route request
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if len(sURL) > 0 {
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if h, ok := apiRoutes[sURL[0]]; ok {
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if f, ok := (*h)[r.Method]; ok {
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ret, err = f(sURL[1:], body)
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} else {
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err = errors.New(fmt.Sprintf("Invalid action (%s) provided for %s.", r.Method, sURL[0]))
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}
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}
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} else {
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err = errors.New("No action provided.")
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}
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// Format response
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resStatus := http.StatusOK
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if err != nil {
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ret = map[string]string{"errmsg": err.Error()}
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resStatus = http.StatusBadRequest
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log.Println(r.RemoteAddr, resStatus, err.Error())
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}
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if ret == nil {
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ret = map[string]string{"errmsg": "Page not found"}
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resStatus = http.StatusNotFound
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}
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if str, found := ret.(string); found {
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w.WriteHeader(resStatus)
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io.WriteString(w, str)
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} else if bts, found := ret.([]byte); found {
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w.WriteHeader(resStatus)
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w.Write(bts)
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} else if j, err := json.Marshal(ret); err != nil {
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http.Error(w, fmt.Sprintf("{\"errmsg\":\"%q\"}", err), http.StatusInternalServerError)
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} else {
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w.WriteHeader(resStatus)
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w.Write(j)
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}
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}
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