Mercurial > gemma
annotate pkg/controllers/json.go @ 871:f0b6852c14d1 geo-style
More on uploading styles to gemma.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sun, 30 Sep 2018 11:49:23 +0200 |
parents | 8bb2e48e2dfd |
children | 7934b5c1a910 |
rev | line source |
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1 package controllers |
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2 |
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3 import ( |
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4 "database/sql" |
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5 "encoding/json" |
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6 "fmt" |
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7 "io" |
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8 "log" |
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9 "net/http" |
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10 |
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11 "github.com/jackc/pgx" |
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12 |
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13 "gemma.intevation.de/gemma/pkg/auth" |
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14 ) |
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15 |
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16 type JSONResult struct { |
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17 Code int |
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18 Result interface{} |
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19 } |
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20 |
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21 type JSONHandler struct { |
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22 Input func() interface{} |
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23 Handle func(interface{}, *http.Request, *sql.Conn) (JSONResult, error) |
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24 NoConn bool |
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25 } |
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27 type JSONError struct { |
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28 Code int |
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29 Message string |
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30 } |
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31 |
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32 func (je JSONError) Error() string { |
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33 return fmt.Sprintf("%d: %s", je.Code, je.Message) |
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34 } |
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35 |
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36 func (j *JSONHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) { |
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37 |
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38 var input interface{} |
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39 if j.Input != nil { |
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40 input = j.Input() |
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41 defer req.Body.Close() |
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42 if err := json.NewDecoder(req.Body).Decode(input); err != nil { |
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43 http.Error(rw, "error: "+err.Error(), http.StatusBadRequest) |
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44 return |
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45 } |
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46 } |
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47 |
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48 var jr JSONResult |
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49 var err error |
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50 |
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51 if token, ok := auth.GetToken(req); ok && !j.NoConn { |
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52 if session := auth.Sessions.Session(token); session != nil { |
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53 err = auth.RunAs(session.User, req.Context(), func(conn *sql.Conn) error { |
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54 jr, err = j.Handle(input, req, conn) |
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55 return err |
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56 }) |
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57 } else { |
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58 err = auth.ErrNoSuchToken |
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59 } |
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60 } else { |
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61 jr, err = j.Handle(input, req, nil) |
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62 } |
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63 |
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64 if err != nil { |
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65 log.Printf("error: %v\n", err) |
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66 switch e := err.(type) { |
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67 case pgx.PgError: |
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68 var res = struct { |
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69 Result string `json:"result"` |
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70 Code string `json:"code"` |
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71 Message string `json:"message"` |
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72 }{ |
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73 Result: "failure", |
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74 Code: e.Code, |
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75 Message: e.Message, |
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76 } |
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77 rw.Header().Set("Content-Type", "application/json") |
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78 rw.WriteHeader(http.StatusInternalServerError) |
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79 if err := json.NewEncoder(rw).Encode(&res); err != nil { |
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80 log.Printf("error: %v\n", err) |
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81 } |
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82 case JSONError: |
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83 rw.Header().Set("Content-Type", "application/json") |
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84 if e.Code == 0 { |
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85 e.Code = http.StatusInternalServerError |
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86 } |
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87 rw.WriteHeader(e.Code) |
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88 var res = struct { |
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89 Message string `json:"message"` |
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90 }{ |
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91 Message: e.Message, |
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92 } |
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93 if err := json.NewEncoder(rw).Encode(&res); err != nil { |
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94 log.Printf("error: %v\n", err) |
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95 } |
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96 default: |
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97 http.Error(rw, |
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98 "error: "+err.Error(), |
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99 http.StatusInternalServerError) |
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100 } |
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101 return |
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102 } |
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103 |
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104 if jr.Code == 0 { |
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105 jr.Code = http.StatusOK |
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106 } |
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107 |
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108 if jr.Code != http.StatusNoContent { |
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109 rw.Header().Set("Content-Type", "application/json") |
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110 } |
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111 rw.WriteHeader(jr.Code) |
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112 if jr.Code != http.StatusNoContent { |
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113 var err error |
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114 if r, ok := jr.Result.(io.Reader); ok { |
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115 _, err = io.Copy(rw, r) |
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116 } else { |
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117 err = json.NewEncoder(rw).Encode(jr.Result) |
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118 } |
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119 if err != nil { |
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120 log.Printf("error: %v\n", err) |
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121 } |
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122 } |
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123 } |