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Commit | Line | Data |
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1 | package api | |
2 | ||
3 | import ( | |
4 | "net/http" | |
5 | "unicode" | |
6 | ||
7 | "github.com/gin-gonic/gin" | |
8 | ) | |
9 | ||
10 | var CONFIG Config | |
11 | ||
12 | type Config struct { | |
13 | JwtSecret string `toml:"jwt_secret"` | |
14 | PasswordResetSecret string `toml:"password_reset_secret"` | |
15 | FreeSMSUser string `toml:"free_sms_user"` | |
16 | FreeSMSPass string `toml:"free_sms_pass"` | |
17 | } | |
18 | ||
19 | func SetConfig(config Config) { | |
20 | CONFIG = config | |
21 | ||
22 | JWT_SECRET = []byte(config.JwtSecret) | |
23 | PASSWORD_RESET_SECRET = []byte(config.PasswordResetSecret) | |
24 | } | |
25 | ||
26 | type Error struct { | |
27 | Code ErrorCode | |
28 | UserMessage string | |
29 | err error | |
30 | } | |
31 | ||
32 | func (e Error) Err() error { | |
33 | if e.err != nil { | |
34 | return e | |
35 | } | |
36 | ||
37 | return nil | |
38 | } | |
39 | ||
40 | func (e Error) Error() string { | |
41 | if e.err != nil { | |
42 | return e.err.Error() | |
43 | } | |
44 | ||
45 | return "" | |
46 | } | |
47 | ||
48 | func ErrorIs(err error, code ErrorCode) bool { | |
49 | if err == nil { | |
50 | return false | |
51 | } | |
52 | ||
53 | if apiError, ok := err.(*Error); !ok { | |
54 | return false | |
55 | } else { | |
56 | return apiError.Code == code | |
57 | } | |
58 | } | |
59 | ||
60 | func NewInternalError(err error) *Error { | |
61 | return &Error{InternalError, "internal error", err} | |
62 | } | |
63 | ||
64 | func ToSnake(in string) string { | |
65 | runes := []rune(in) | |
66 | length := len(runes) | |
67 | ||
68 | var out []rune | |
69 | for i := 0; i < length; i++ { | |
70 | if i > 0 && unicode.IsUpper(runes[i]) && ((i+1 < length && unicode.IsLower(runes[i+1])) || unicode.IsLower(runes[i-1])) { | |
71 | out = append(out, '_') | |
72 | } | |
73 | out = append(out, unicode.ToLower(runes[i])) | |
74 | } | |
75 | ||
76 | return string(out) | |
77 | } | |
78 | ||
79 | type Response struct { | |
80 | StatusCode Status `json:"-"` | |
81 | ErrorCode ErrorCode `json:"-"` | |
82 | ||
83 | Status string `json:"status"` | |
84 | Code string `json:"code,omitempty"` | |
85 | Response interface{} `json:"response,omitempty"` | |
86 | Message string `json:"message,omitempty"` | |
87 | } | |
88 | ||
89 | func (r Response) populateStatus() Response { | |
90 | r.Status = ToSnake(r.StatusCode.String()) | |
91 | ||
92 | if r.ErrorCode != 0 { | |
93 | r.Code = ToSnake(r.ErrorCode.String()) | |
94 | } | |
95 | ||
96 | return r | |
97 | } | |
98 | ||
99 | func ErrorResponse(code ErrorCode, message string) Response { | |
100 | return Response{ | |
101 | StatusCode: NOK, | |
102 | ErrorCode: code, | |
103 | Message: message, | |
104 | } | |
105 | } | |
106 | ||
107 | func SuccessResponse(data interface{}) Response { | |
108 | return Response{ | |
109 | StatusCode: OK, | |
110 | Response: data, | |
111 | } | |
112 | } | |
113 | ||
114 | func WriteJsonResponse(response Response, c *gin.Context) { | |
115 | response = response.populateStatus() | |
116 | ||
117 | c.JSON(StatusToHttpCode(response.StatusCode, response.ErrorCode), response) | |
118 | } | |
119 | ||
120 | func WriteBinary(contentType string, b []byte, c *gin.Context) { | |
121 | c.Data(http.StatusOK, contentType, b) | |
122 | } | |
123 | ||
124 | type Middleware func(*gin.Context) *Error | |
125 | ||
126 | func M(handler Middleware) gin.HandlerFunc { | |
127 | return func(c *gin.Context) { | |
128 | err := handler(c) | |
129 | ||
130 | if err != nil { | |
131 | WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c) | |
132 | c.Error(err) | |
133 | c.Abort() | |
134 | } else { | |
135 | c.Next() | |
136 | } | |
137 | } | |
138 | } | |
139 | ||
140 | type Query interface { | |
141 | ValidateParams() *Error | |
142 | Run() (interface{}, *Error) | |
143 | } | |
144 | ||
145 | func RunQuery(query Query, c *gin.Context) { | |
146 | if err := query.ValidateParams(); err != nil { | |
147 | WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c) | |
148 | c.Error(err) | |
149 | return | |
150 | } | |
151 | ||
152 | if out, err := query.Run(); err != nil { | |
153 | WriteJsonResponse(ErrorResponse(err.Code, err.UserMessage), c) | |
154 | c.Error(err) | |
155 | } else { | |
156 | WriteJsonResponse(SuccessResponse(out), c) | |
157 | } | |
158 | } |