98 lines
2.4 KiB
Go
98 lines
2.4 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(*User, []string, io.ReadCloser) (interface{}, error)
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type apiHandler struct {
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PE *PictureExplorer
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Authenticate func(*http.Request) *User
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routes map[string](map[string]struct {
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AuthFunction
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DispatchFunction
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})
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}
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func NewAPIHandler(pe *PictureExplorer, authenticate func(*http.Request) *User) *apiHandler {
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return &apiHandler{
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pe,
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authenticate,
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map[string](map[string]struct {
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AuthFunction
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DispatchFunction
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}){
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"images": ApiImagesRouting(pe),
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"next": ApiNextImagesRouting(pe),
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"version": ApiVersionRouting,
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},
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}
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}
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func (a *apiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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user := a.Authenticate(r)
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log.Printf("Handling %s API request from %s: %s %s [%s]\n", r.Method, r.RemoteAddr, r.URL.Path, user, 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 sURL[len(sURL)-1] == "" && len(sURL) > 0 {
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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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// Refuse too large requests
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if r.ContentLength < 0 || r.ContentLength > 10485760 || ((r.Method == "DELETE" || r.Method == "GET" || r.Method == "HEAD") && r.ContentLength > 0) {
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http.Error(w, "{errmsg:\"Request too large or request size unknown\"}", http.StatusRequestEntityTooLarge)
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return
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}
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// Route request
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if len(sURL) == 0 {
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err = errors.New(fmt.Sprintf("No action provided"))
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} else if h, ok := a.routes[sURL[0]]; ok {
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if f, ok := h[r.Method]; ok {
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if f.AuthFunction(user, sURL[1:]) {
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ret, err = f.DispatchFunction(user, sURL[1:], r.Body)
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} else {
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w.Header().Set("WWW-Authenticate", "Basic realm=\"YouP0m\"")
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http.Error(w, "{errmsg:\"You are not allowed to do this request.\"}", http.StatusUnauthorized)
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return
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}
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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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// 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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}
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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 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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