Marko Tikvić / webutility

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Commit 3a5383589b7de961fdb341054285a989bfe12722

Authored by Marko Tikvić
1 parent 6ec91280b2
Exists in master and in 1 other branch v2

Improved documentation.

Showing 1 changed file with 2 additions and 1 deletions   Show diff stats
1 package webutility 1 package webutility
2 2
3 import ( 3 import (
4 "net/http" 4 "net/http"
5 "encoding/json" 5 "encoding/json"
6 ) 6 )
7 7
8 const templateHttpErr500_EN = "An internal server error has occurred." 8 const templateHttpErr500_EN = "An internal server error has occurred."
9 const templateHttpErr500_RS = "Došlo je do greške na serveru." 9 const templateHttpErr500_RS = "Došlo je do greške na serveru."
10 const templateHttpErr400_EN = "Bad request: invalid request body." 10 const templateHttpErr400_EN = "Bad request: invalid request body."
11 const templateHttpErr400_RS = "Neispravan zahtev." 11 const templateHttpErr400_RS = "Neispravan zahtev."
12 const templateHttpErr401_EN = "Unauthorized request." 12 const templateHttpErr401_EN = "Unauthorized request."
13 const templateHttpErr401_RS = "Neautorizovan zahtev." 13 const templateHttpErr401_RS = "Neautorizovan zahtev."
14 14
15 type httpError struct { 15 type httpError struct {
16 Error []HttpErrorDesc `json:"error"` 16 Error []HttpErrorDesc `json:"error"`
17 Request string `json:"request"` 17 Request string `json:"request"`
18 } 18 }
19 19
20 type HttpErrorDesc struct { 20 type HttpErrorDesc struct {
21 Lang string `json:"lang"` 21 Lang string `json:"lang"`
22 Desc string `json:"description"` 22 Desc string `json:"description"`
23 } 23 }
24 24
25 // ErrorResponse writes HTTP error to w. 25 // ErrorResponse writes HTTP error to w.
26 func ErrorResponse(w http.ResponseWriter, r *http.Request, code int, desc []HttpErrorDesc) { 26 func ErrorResponse(w http.ResponseWriter, r *http.Request, code int, desc []HttpErrorDesc) {
27 err := httpError{ desc, r.Method + " " + r.URL.Path } 27 err := httpError{ desc, r.Method + " " + r.URL.Path }
28 w.WriteHeader(code) 28 w.WriteHeader(code)
29 json.NewEncoder(w).Encode(err) 29 json.NewEncoder(w).Encode(err)
30 } 30 }
31 31
32 // BadRequestResponse writes HTTP error 400 to w. 32 // BadRequestResponse writes HTTP error 400 to w.
33 func BadRequestResponse(w http.ResponseWriter, req *http.Request) { 33 func BadRequestResponse(w http.ResponseWriter, req *http.Request) {
34 ErrorResponse(w, req, http.StatusBadRequest, []HttpErrorDesc{ 34 ErrorResponse(w, req, http.StatusBadRequest, []HttpErrorDesc{
35 { "en", templateHttpErr400_EN }, 35 { "en", templateHttpErr400_EN },
36 { "rs", templateHttpErr400_RS }, 36 { "rs", templateHttpErr400_RS },
37 }) 37 })
38 } 38 }
39 39
40 // InternalSeverErrorResponse writes HTTP error 500 to w. 40 // InternalSeverErrorResponse writes HTTP error 500 to w.
41 func InternalServerErrorResponse(w http.ResponseWriter, req *http.Request) { 41 func InternalServerErrorResponse(w http.ResponseWriter, req *http.Request) {
42 ErrorResponse(w, req, http.StatusInternalServerError, []HttpErrorDesc{ 42 ErrorResponse(w, req, http.StatusInternalServerError, []HttpErrorDesc{
43 { "en", templateHttpErr500_EN }, 43 { "en", templateHttpErr500_EN },
44 { "rs", templateHttpErr500_RS }, 44 { "rs", templateHttpErr500_RS },
45 }) 45 })
46 } 46 }
47 47
48 // UnauthorizedError writes HTTP error 401 to w. 48 // UnauthorizedError writes HTTP error 401 to w.
49 func UnauthorizedResponse(w http.ResponseWriter, req *http.Request) { 49 func UnauthorizedResponse(w http.ResponseWriter, req *http.Request) {
50 ErrorResponse(w, req, http.StatusUnauthorized, []HttpErrorDesc{ 50 ErrorResponse(w, req, http.StatusUnauthorized, []HttpErrorDesc{
51 { "en", templateHttpErr401_EN }, 51 { "en", templateHttpErr401_EN },
52 { "rs", templateHttpErr401_RS }, 52 { "rs", templateHttpErr401_RS },
53 }) 53 })
54 } 54 }
55 55
56 // TODO: Check for content type 56 // TODO: Check for content type
57 // Sets common headers, checks for token validity and performs access control. 57 // WrapHandler sets common headers, checks for token validity and performs access control.
58 // If authentication passes it calls the handlerFunc.
58 func WrapHandler(handlerFunc http.HandlerFunc, auth bool) http.HandlerFunc { 59 func WrapHandler(handlerFunc http.HandlerFunc, auth bool) http.HandlerFunc {
59 return func(w http.ResponseWriter, req *http.Request) { 60 return func(w http.ResponseWriter, req *http.Request) {
60 w.Header().Set("Access-Control-Allow-Origin", "*") 61 w.Header().Set("Access-Control-Allow-Origin", "*")
61 62
62 w.Header().Set("Access-Control-Allow-Methods", 63 w.Header().Set("Access-Control-Allow-Methods",
63 "POST, GET, PUT, DELETE, OPTIONS") 64 "POST, GET, PUT, DELETE, OPTIONS")
64 65
65 w.Header().Set("Access-Control-Allow-Headers", 66 w.Header().Set("Access-Control-Allow-Headers",
66 `Accept, Content-Type, Content-Length, 67 `Accept, Content-Type, Content-Length,
67 Accept-Encoding, X-CSRF-Token, Authorization`) 68 Accept-Encoding, X-CSRF-Token, Authorization`)
68 69
69 w.Header().Set("Content-Type", "application/json; charset=utf-8") 70 w.Header().Set("Content-Type", "application/json; charset=utf-8")
70 71
71 if req.Method == "OPTIONS" { 72 if req.Method == "OPTIONS" {
72 return 73 return
73 } 74 }
74 75
75 if auth { 76 if auth {
76 token := req.Header.Get("Authorization") 77 token := req.Header.Get("Authorization")
77 if _, err := ParseAPIToken(token); err != nil { 78 if _, err := ParseAPIToken(token); err != nil {
78 UnauthorizedResponse(w, req) 79 UnauthorizedResponse(w, req)
79 return 80 return
80 } 81 }
81 } 82 }
82 83
83 err := req.ParseForm() 84 err := req.ParseForm()
84 if err != nil { 85 if err != nil {
85 BadRequestResponse(w, req) 86 BadRequestResponse(w, req)
86 return 87 return
87 } 88 }
88 89
89 // execute HandlerFunc 90 // execute HandlerFunc
90 handlerFunc(w, req) 91 handlerFunc(w, req)
91 } 92 }
92 } 93 }
93 94
94 // NotFoundHandler writes HTTP error 404 to w. 95 // NotFoundHandler writes HTTP error 404 to w.
95 func NotFoundHandler(w http.ResponseWriter, req *http.Request) { 96 func NotFoundHandler(w http.ResponseWriter, req *http.Request) {
96 ErrorResponse(w, req, http.StatusNotFound, []HttpErrorDesc{ 97 ErrorResponse(w, req, http.StatusNotFound, []HttpErrorDesc{
97 { "en", "Not found." }, 98 { "en", "Not found." },
98 { "rs", "Traženi resurs ne postoji." }, 99 { "rs", "Traženi resurs ne postoji." },
99 }) 100 })
100 } 101 }
101 102