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| 1 | +package gitlab |
| 2 | + |
| 3 | +import ( |
| 4 | + "encoding/json" |
| 5 | + "io/ioutil" |
| 6 | + "net/http" |
| 7 | + |
| 8 | + "gopkg.in/go-playground/webhooks.v2" |
| 9 | +) |
| 10 | + |
| 11 | +// Webhook instance contains all methods needed to process events |
| 12 | +type Webhook struct { |
| 13 | + provider webhooks.Provider |
| 14 | + secret string |
| 15 | + eventFuncs map[Event]webhooks.ProcessPayloadFunc |
| 16 | +} |
| 17 | + |
| 18 | +// Config defines the configuration to create a new GitHub Webhook instance |
| 19 | +type Config struct { |
| 20 | + Secret string |
| 21 | +} |
| 22 | + |
| 23 | +// Event defines a GitHub hook event type |
| 24 | +type Event string |
| 25 | + |
| 26 | +// GitLab hook types |
| 27 | +const ( |
| 28 | + PushEvents Event = "Push Hook" |
| 29 | + TagEvents Event = "Tag Push Hook" |
| 30 | + IssuesEvents Event = "Issue Hook" |
| 31 | + CommentEvents Event = "Note Hook" |
| 32 | + MergerRequestEvents Event = "Merge Request Hook" |
| 33 | + WikiPageEvents Event = "Wiki Page Hook" |
| 34 | + PipelineEvents Event = "Pipeline Hook" |
| 35 | + BuildEvents Event = "Build Hook" |
| 36 | +) |
| 37 | + |
| 38 | +// New creates and returns a WebHook instance denoted by the Provider type |
| 39 | +func New(config *Config) *Webhook { |
| 40 | + return &Webhook{ |
| 41 | + provider: webhooks.GitLab, |
| 42 | + secret: config.Secret, |
| 43 | + eventFuncs: map[Event]webhooks.ProcessPayloadFunc{}, |
| 44 | + } |
| 45 | +} |
| 46 | + |
| 47 | +// Provider returns the current hooks provider ID |
| 48 | +func (hook Webhook) Provider() webhooks.Provider { |
| 49 | + return hook.provider |
| 50 | +} |
| 51 | + |
| 52 | +// RegisterEvents registers the function to call when the specified event(s) are encountered |
| 53 | +func (hook Webhook) RegisterEvents(fn webhooks.ProcessPayloadFunc, events ...Event) { |
| 54 | + |
| 55 | + for _, event := range events { |
| 56 | + hook.eventFuncs[event] = fn |
| 57 | + } |
| 58 | +} |
| 59 | + |
| 60 | +// ParsePayload parses and verifies the payload and fires off the mapped function, if it exists. |
| 61 | +func (hook Webhook) ParsePayload(w http.ResponseWriter, r *http.Request) { |
| 62 | + |
| 63 | + event := r.Header.Get("X-Gitlab-Event") |
| 64 | + if len(event) == 0 { |
| 65 | + http.Error(w, "400 Bad Request - Missing X-Gitlab-Event Header", http.StatusBadRequest) |
| 66 | + return |
| 67 | + } |
| 68 | + |
| 69 | + gitLabEvent := Event(event) |
| 70 | + |
| 71 | + fn, ok := hook.eventFuncs[gitLabEvent] |
| 72 | + // if no event registered |
| 73 | + if !ok { |
| 74 | + return |
| 75 | + } |
| 76 | + |
| 77 | + payload, err := ioutil.ReadAll(r.Body) |
| 78 | + if err != nil || len(payload) == 0 { |
| 79 | + http.Error(w, "Error reading Body", http.StatusInternalServerError) |
| 80 | + return |
| 81 | + } |
| 82 | + |
| 83 | + // If we have a Secret set, we should check the MAC |
| 84 | + if len(hook.secret) > 0 { |
| 85 | + |
| 86 | + signature := r.Header.Get("X-Gitlab-Token") |
| 87 | + |
| 88 | + if signature != hook.secret { |
| 89 | + http.Error(w, "403 Forbidden - Token missmatch", http.StatusForbidden) |
| 90 | + return |
| 91 | + } |
| 92 | + } |
| 93 | + |
| 94 | + // Make headers available to ProcessPayloadFunc as a webhooks type |
| 95 | + hd := webhooks.Header(r.Header) |
| 96 | + |
| 97 | + switch gitLabEvent { |
| 98 | + case PushEvents: |
| 99 | + var pe PushEventPayload |
| 100 | + json.Unmarshal([]byte(payload), &pe) |
| 101 | + hook.runProcessPayloadFunc(fn, pe, hd) |
| 102 | + |
| 103 | + case TagEvents: |
| 104 | + var te TagEventPayload |
| 105 | + json.Unmarshal([]byte(payload), &te) |
| 106 | + hook.runProcessPayloadFunc(fn, te, hd) |
| 107 | + |
| 108 | + case IssuesEvents: |
| 109 | + var ie IssueEventPayload |
| 110 | + json.Unmarshal([]byte(payload), &ie) |
| 111 | + hook.runProcessPayloadFunc(fn, ie, hd) |
| 112 | + |
| 113 | + case CommentEvents: |
| 114 | + var ce CommentEventPayload |
| 115 | + json.Unmarshal([]byte(payload), &ce) |
| 116 | + hook.runProcessPayloadFunc(fn, ce, hd) |
| 117 | + |
| 118 | + case MergerRequestEvents: |
| 119 | + var mre MergeRequestEventPayload |
| 120 | + json.Unmarshal([]byte(payload), &mre) |
| 121 | + hook.runProcessPayloadFunc(fn, mre, hd) |
| 122 | + |
| 123 | + case WikiPageEvents: |
| 124 | + var wpe WikiPageEventPayload |
| 125 | + json.Unmarshal([]byte(payload), &wpe) |
| 126 | + hook.runProcessPayloadFunc(fn, wpe, hd) |
| 127 | + |
| 128 | + case PipelineEvents: |
| 129 | + var pe PipelineEventPayload |
| 130 | + json.Unmarshal([]byte(payload), &pe) |
| 131 | + hook.runProcessPayloadFunc(fn, pe, hd) |
| 132 | + |
| 133 | + case BuildEvents: |
| 134 | + var be BuildEventPayload |
| 135 | + json.Unmarshal([]byte(payload), &be) |
| 136 | + hook.runProcessPayloadFunc(fn, be, hd) |
| 137 | + } |
| 138 | +} |
| 139 | + |
| 140 | +func (hook Webhook) runProcessPayloadFunc(fn webhooks.ProcessPayloadFunc, results interface{}, header webhooks.Header) { |
| 141 | + go func(fn webhooks.ProcessPayloadFunc, results interface{}, header webhooks.Header) { |
| 142 | + fn(results, header) |
| 143 | + }(fn, results, header) |
| 144 | +} |
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