202 lines
7.2 KiB
Go
202 lines
7.2 KiB
Go
package main
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import (
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"crypto/hmac"
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"crypto/sha512"
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"encoding/base64"
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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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"strconv"
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"time"
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"github.com/julienschmidt/httprouter"
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"git.nemunai.re/srs/adlin/libadlin"
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)
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var router = httprouter.New()
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func Router() *httprouter.Router {
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return router
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}
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type DispatchFunction func(httprouter.Params, []byte) (interface{}, error)
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func remoteValidatorHandler(f func(http.ResponseWriter, *http.Request, httprouter.Params)) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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h := hmac.New(sha512.New, []byte(adlin.SharedSecret))
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h.Write([]byte(fmt.Sprintf("%d", time.Now().Unix()/10)))
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expectedMAC := h.Sum(nil)
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h = hmac.New(sha512.New, []byte(adlin.SharedSecret))
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h.Write([]byte(fmt.Sprintf("%d", time.Now().Unix()/10-1)))
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previousMAC := h.Sum(nil)
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if aauth, err := base64.StdEncoding.DecodeString(r.Header.Get("X-ADLIN-Authentication")); err != nil {
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http.Error(w, fmt.Sprintf("{\"errmsg\":%q}\n", err), http.StatusUnauthorized)
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} else if !hmac.Equal(expectedMAC, aauth) && !hmac.Equal(previousMAC, aauth) {
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http.Error(w, fmt.Sprintf("{\"errmsg\":%q}\n", "Bad authentication header"), http.StatusUnauthorized)
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} else {
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f(w, r, ps)
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}
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}
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}
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func rawHandler(f func(http.ResponseWriter, *http.Request, httprouter.Params, []byte), access ...func(*adlin.Student, *http.Request) error) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
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if addr := r.Header.Get("X-Forwarded-For"); addr != "" {
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r.RemoteAddr = addr
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}
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log.Printf("%s \"%s %s\" [%s]\n", r.RemoteAddr, r.Method, r.URL.Path, r.UserAgent())
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w.Header().Set("Content-Type", "application/json")
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// Read Authorization header
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var student *adlin.Student = nil
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if cookie, err := r.Cookie("auth"); err == nil {
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if sessionid, err := base64.StdEncoding.DecodeString(cookie.Value); err != nil {
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http.SetCookie(w, &http.Cookie{Name: "auth", Value: "", Path: baseURL + "/", Expires: time.Time{}, HttpOnly: true})
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http.Error(w, fmt.Sprintf(`{"errmsg": %q}`, err), http.StatusNotAcceptable)
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return
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} else if session, err := adlin.GetSession(sessionid); err != nil {
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http.SetCookie(w, &http.Cookie{Name: "auth", Value: "", Path: baseURL + "/", Expires: time.Time{}, HttpOnly: true})
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http.Error(w, fmt.Sprintf(`{"errmsg": %q}`, err), http.StatusUnauthorized)
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return
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} else if session.IdStudent == nil {
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student = nil
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} else if std, err := adlin.GetStudent(int(*session.IdStudent)); err != nil {
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http.SetCookie(w, &http.Cookie{Name: "auth", Value: "", Path: baseURL + "/", Expires: time.Time{}, HttpOnly: true})
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http.Error(w, fmt.Sprintf(`{"errmsg": %q}`, err), http.StatusUnauthorized)
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return
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} else {
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student = std
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}
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}
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// Check access limitation
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for _, a := range access {
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if err := a(student, r); err != nil {
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http.Error(w, fmt.Sprintf(`{"errmsg":%q}`, err), http.StatusForbidden)
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return
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}
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}
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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, "{errmsg:\"Request too large or request size unknown\"}", 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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f(w, r, ps, body)
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}
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}
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func responseHandler(f func(*http.Request, httprouter.Params, []byte) (interface{}, error)) func(http.ResponseWriter, *http.Request, httprouter.Params, []byte) {
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return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params, body []byte) {
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ret, err := f(r, ps, body)
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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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w.Write([]byte("\n"))
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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}\n", 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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w.Write([]byte("\n"))
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}
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}
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}
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func challengeHandler(f func(*http.Request, []byte, int) (interface{}, error)) func(*http.Request, httprouter.Params, []byte) (interface{}, error) {
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return func(r *http.Request, ps httprouter.Params, body []byte) (interface{}, error) {
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return f(r, body, 0)
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}
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}
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func definedChallengeHandler(f func(*http.Request, []byte, int) (interface{}, error), chid int) func(*http.Request, httprouter.Params, []byte) (interface{}, error) {
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return func(r *http.Request, ps httprouter.Params, body []byte) (interface{}, error) {
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return f(r, body, chid)
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}
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}
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func apiRawHandler(f func(http.ResponseWriter, httprouter.Params, []byte) (interface{}, error), access ...func(*adlin.Student, *http.Request) error) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return rawHandler(func(w http.ResponseWriter, r *http.Request, ps httprouter.Params, b []byte) {
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responseHandler(func(_ *http.Request, ps httprouter.Params, b []byte) (interface{}, error) {
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return f(w, ps, b)
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})(w, r, ps, b)
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}, access...)
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}
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func apiHandler(f DispatchFunction, access ...func(*adlin.Student, *http.Request) error) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return rawHandler(responseHandler(func(_ *http.Request, ps httprouter.Params, b []byte) (interface{}, error) { return f(ps, b) }), access...)
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}
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func apiAuthHandler(f func(*adlin.Student, httprouter.Params, []byte) (interface{}, error), access ...func(*adlin.Student, *http.Request) error) func(http.ResponseWriter, *http.Request, httprouter.Params) {
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return rawHandler(responseHandler(func(r *http.Request, ps httprouter.Params, b []byte) (interface{}, error) {
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if cookie, err := r.Cookie("auth"); err != nil {
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return nil, errors.New("Authorization required")
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} else if sessionid, err := base64.StdEncoding.DecodeString(cookie.Value); err != nil {
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return nil, err
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} else if session, err := adlin.GetSession(sessionid); err != nil {
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return nil, err
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} else if session.IdStudent == nil {
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return nil, errors.New("Authorization required")
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} else if std, err := adlin.GetStudent(int(*session.IdStudent)); err != nil {
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return nil, err
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} else {
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return f(std, ps, b)
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}
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}), access...)
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}
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func studentHandler(f func(*adlin.Student, []byte) (interface{}, error)) func(httprouter.Params, []byte) (interface{}, error) {
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return func(ps httprouter.Params, body []byte) (interface{}, error) {
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if sid, err := strconv.Atoi(string(ps.ByName("sid"))); err != nil {
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if student, err := adlin.GetStudentByLogin(ps.ByName("sid")); err != nil {
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return nil, err
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} else {
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return f(student, body)
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}
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} else if student, err := adlin.GetStudent(sid); err != nil {
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return nil, err
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} else {
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return f(student, body)
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}
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}
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}
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