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annotate controllers/json.go @ 302:0777aa6de45b

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Password reset. Part I
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 01 Aug 2018 12:29:55 +0200
parents dfc2b035e055
children 889517f254f5
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3771788d3dae Reduce boilerplate code when writing JSON parsing/generating endpoints.
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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 "log"
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8 "net/http"
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9
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10 "github.com/jackc/pgx"
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11
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12 "gemma.intevation.de/gemma/auth"
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13 )
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14
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15 type JSONResult struct {
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16 Code int
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17 Result interface{}
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18 }
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19
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20 type JSONHandler struct {
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21 Input func() interface{}
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22 Handle func(interface{}, *http.Request, *sql.DB) (JSONResult, error)
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23 }
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24
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25 type JSONError struct {
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26 Code int
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27 Message string
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28 }
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29
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30 func (je JSONError) Error() string {
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31 return fmt.Sprintf("%d: %s", je.Code, je.Message)
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32 }
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33
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34 func (j *JSONHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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35
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36 var input interface{}
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37 if j.Input != nil {
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38 input = j.Input()
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39 defer req.Body.Close()
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40 if err := json.NewDecoder(req.Body).Decode(input); err != nil {
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41 http.Error(rw, "error: "+err.Error(), http.StatusBadRequest)
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42 return
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43 }
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44 }
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45
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46 var jr JSONResult
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47 var err error
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48
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49 if token, ok := auth.GetToken(req); ok {
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50 err = auth.ConnPool.Do(token, func(db *sql.DB) (err error) {
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51 jr, err = j.Handle(input, req, db)
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52 return err
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53 })
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54 } else {
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55 jr, err = j.Handle(input, req, nil)
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56 }
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57
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58 if err != nil {
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59 switch e := err.(type) {
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60 case pgx.PgError:
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61 var res = struct {
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62 Result string `json:"result"`
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63 Code string `json:"code"`
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64 Message string `json:"message"`
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65 }{
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66 Result: "failure",
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67 Code: e.Code,
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68 Message: e.Message,
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69 }
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70 rw.Header().Set("Content-Type", "application/json")
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71 rw.WriteHeader(http.StatusInternalServerError)
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72 if err := json.NewEncoder(rw).Encode(&res); err != nil {
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73 log.Printf("error: %v\n", err)
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74 }
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75 case JSONError:
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76 rw.Header().Set("Content-Type", "application/json")
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77 rw.WriteHeader(http.StatusInternalServerError)
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78 var res = struct {
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79 Message string `json:"message"`
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80 }{
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81 Message: e.Message,
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82 }
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83 if err := json.NewEncoder(rw).Encode(&res); err != nil {
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84 log.Printf("error: %v\n", err)
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85 }
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86 default:
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87 log.Printf("err: %v\n", err)
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88 http.Error(rw,
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89 "error: "+err.Error(),
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90 http.StatusInternalServerError)
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91 }
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92 return
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93 }
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94
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95 if jr.Code == 0 {
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96 jr.Code = http.StatusOK
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97 }
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98
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99 if jr.Code != http.StatusNoContent {
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100 rw.Header().Set("Content-Type", "application/json")
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101 }
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102 rw.WriteHeader(jr.Code)
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103 if jr.Code != http.StatusNoContent {
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104 if err := json.NewEncoder(rw).Encode(jr.Result); err != nil {
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105 log.Printf("error: %v\n", err)
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106 }
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107 }
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108 }