diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b52c626 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +env.txt +secret.yaml diff --git a/.ko.yaml b/.ko.yaml new file mode 100644 index 0000000..6ccd2d5 --- /dev/null +++ b/.ko.yaml @@ -0,0 +1 @@ +defaultBaseImage: gcr.io/distroless/static:nonroot diff --git a/README.md b/README.md index 1bff56a..9120629 100644 --- a/README.md +++ b/README.md @@ -9,28 +9,68 @@ This way we can trigger cleanups when the PR is closed. ## Push Event ``` -X-Interceptor-Ref: refs/heads/master +X-Interceptor-Push-Ref: []string{"refs/heads/master"} +``` + +Response Headers: + +``` +Commit: ``` ## Pull-Request Event ``` -X-Interceptor-Action: [create|delete] +X-Interceptor-Pr-Action: []string{"opened", "reopened", "synchronize", "synchronized"} +``` + +Response Headers: + +``` +Issue: +Commit: ``` ## Issue Comment Event -**TBD** +``` +X-Interceptor-Comment-Action: "/test" +``` + +### Actions + +TBD: + +* `/label ` - add a label `` to the pull request +* `/test` - run tests pipeline (requires `test` label) +* `/deploy` - deploy pull request in preview environment (requires `deploy` label) + +Response Headers: ``` -X-Interceptor-Comment: /test +Issue: +Commit: ``` # Build and run -``` -export KO_DOCKER_REPO='gcr.io/my-gcloud-project-name' -export GO111MODULE=off +Create git authentication secret: -ko apply -f config/ +``` +cat <secret.yaml +apiVersion: v1 +kind: Secret +metadata: + name: git-auth + namespace: webhook-interceptor +type: Opaque +stringData: + github.com: ":" +EOF +``` + +``` +echo KO_DOCKER_REPO='gcr.io/my-gcloud-project-name' >env.txt + +./build.sh ``` diff --git a/build.sh b/build.sh new file mode 100755 index 0000000..424b1e7 --- /dev/null +++ b/build.sh @@ -0,0 +1,8 @@ +#!/bin/bash + +source env.txt +kubectl -n webhook-interceptor delete deploy webhook-interceptor +ko apply -f config/ +kubectl apply -f secret.yaml +sleep 5 +kubectl -n webhook-interceptor logs -f $(kubectl -n webhook-interceptor get pod -ojsonpath='{.items[0].metadata.name}') diff --git a/config/00-namespace.yaml b/config/100-namespace.yaml similarity index 100% rename from config/00-namespace.yaml rename to config/100-namespace.yaml diff --git a/config/01-podsecuritypolicy.yaml b/config/200-podsecuritypolicy.yaml similarity index 100% rename from config/01-podsecuritypolicy.yaml rename to config/200-podsecuritypolicy.yaml diff --git a/config/02-sa.yaml b/config/300-rbac.yaml similarity index 100% rename from config/02-sa.yaml rename to config/300-rbac.yaml diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..bbd2c22 --- /dev/null +++ b/go.mod @@ -0,0 +1,12 @@ +module git.giftfish.de/ston1th/webhook-interceptor + +go 1.13 + +require ( + golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6 // indirect + golang.org/x/time v0.0.0-20191024005414-555d28b269f0 // indirect + k8s.io/api v0.0.0-20191121015604-11707872ac1c + k8s.io/apimachinery v0.0.0-20191203211716-adc6f4cd9e7d + k8s.io/client-go v0.0.0-20190918160344-1fbdaa4c8d90 + k8s.io/utils v0.0.0-20191114200735-6ca3b61696b6 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..e647e7a --- /dev/null +++ b/go.sum @@ -0,0 +1,222 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +github.com/Azure/go-autorest v11.1.2+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24= +github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= +github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0= +github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA= +github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= 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v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI= +sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs= +sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= diff --git a/helper.go b/helper.go new file mode 100644 index 0000000..728ea0c --- /dev/null +++ b/helper.go @@ -0,0 +1,68 @@ +// Copyright (C) 2019 Marius Schellenberger + +package main + +import ( + "encoding/json" + "io/ioutil" + "log" + "net/http" + "os" + "strings" +) + +const ( + githubAPI = "api/v3" + giteaAPI = "api/v1" +) + +func getNS() (string, error) { + if ns := os.Getenv("POD_NAMESPACE"); ns != "" { + return ns, nil + } + if data, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace"); err == nil { + if ns := strings.TrimSpace(string(data)); len(ns) > 0 { + return ns, nil + } + } + + return "default", nil +} + +func logError(w http.ResponseWriter, msg string) { + log.Printf("error: %s", msg) + http.Error(w, msg, http.StatusInternalServerError) +} + +func contains(a []string, s string) bool { + for _, v := range a { + if strings.Contains(s, v) { + return true + } + } + return false +} + +func detectAPI(r *http.Request) string { + if r.Header.Get(giteaEvent) != "" { + return giteaAPI + } + if r.Header.Get(githubEvent) != "" { + return githubAPI + } + return "" +} + +func readBody(r *http.Request, i interface{}) (body []byte, err error) { + defer r.Body.Close() + body, err = ioutil.ReadAll(r.Body) + if err != nil { + return + } + if debug { + log.Printf("debug headers: %#v", r.Header) + log.Printf("debug: %s", string(body)) + } + err = json.Unmarshal(body, i) + return +} diff --git a/main.go b/main.go index 4bf0626..bfbf007 100644 --- a/main.go +++ b/main.go @@ -1,138 +1,231 @@ +// Copyright (C) 2019 Marius Schellenberger + package main import ( "encoding/json" + "fmt" "io/ioutil" "log" + "net" "net/http" + "net/url" + "reflect" + "strconv" + "strings" "time" + + //corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1" + "k8s.io/client-go/rest" ) -var version string +var debug = false -type PR struct { - Action string `json:"action"` +const ( + prAction = "X-Interceptor-Pr-Action" + pushAction = "X-Interceptor-Push-Action" + commentAction = "X-Interceptor-Comment-Action" + + contentType = "Content-Type" + jsonType = "application/json" + + githubEvent = "X-GitHub-Event" + giteaEvent = "X-Gitea-Event" + + issueHeader = "Issue" + commitHeader = "Commit" + + secretName = "git-auth" +) + +func init() { + log.SetFlags(log.Flags() | log.Lshortfile) } -func prHandler(w http.ResponseWriter, r *http.Request) { - var pr PR - defer r.Body.Close() - body, err := ioutil.ReadAll(r.Body) +func (h *Handler) getSecret(host string) (username, password string, err error) { + sec, err := h.sec.Get(secretName, metav1.GetOptions{}) if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) return } - log.Printf("debug headers: %#v", r.Header) - log.Printf("debug body: %s", string(body)) - err = json.Unmarshal(body, &pr) - if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + s, ok := sec.Data[host] + if !ok { + err = fmt.Errorf("no key found for host %s in secret %s/%s", host, sec.Namespace, sec.Name) return } - switch pr.Action { - case "opened", "reopened", "synchronize", // GitHub - "synchronized": // Gitea - if r.Header.Get("X-Interceptor-Action") == "create" { - w.Write(body) - return - } - case "closed": - if r.Header.Get("X-Interceptor-Action") == "delete" { - w.Write(body) - return - } + a := strings.SplitN(string(s), ":", 2) + if len(a) < 2 { + err = fmt.Errorf("missing credentials for host %s in secret %s/%s", host, sec.Namespace, sec.Name) + return } - w.WriteHeader(http.StatusBadRequest) + username = a[0] + password = a[1] + return } -type Push struct { - Ref string `json:"ref"` +func (h *Handler) getPullRequest(repo Repository, api, id string) (*PullRequest, error) { + u, err := url.Parse(repo.CloneURL) + if err != nil { + return nil, err + } + u.Path = strings.Join([]string{api, "repos", + repo.Owner.Login, repo.Name, + "pulls", id}, "/") + req, err := http.NewRequest("GET", u.String(), nil) + if err != nil { + return nil, err + } + req.Header.Set(contentType, jsonType) + + user, pass, err := h.getSecret(u.Host) + if err != nil { + return nil, err + } + req.SetBasicAuth(user, pass) + + resp, err := h.cl.Do(req) + if err != nil { + return nil, err + } + defer resp.Body.Close() + pr := new(PullRequest) + err = json.NewDecoder(resp.Body).Decode(pr) + if err != nil { + return nil, err + } + return pr, nil } -func pushHandler(w http.ResponseWriter, r *http.Request) { - var p Push - defer r.Body.Close() - body, err := ioutil.ReadAll(r.Body) +type Handler struct { + sec typedcorev1.SecretInterface + cl *http.Client +} + +func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) { + event := r.Header.Get(githubEvent) + switch event { + case "pull_request": + h.prHandler(w, r) + case "push": + h.pushHandler(w, r) + case "issue_comment": + h.commentHandler(w, r) + default: + h.dumpHandler(w, r) + } + status := int(reflect.Indirect(reflect.ValueOf(w)).FieldByName("status").Int()) + log.Printf("%s %s %s event:%s status:%d", r.RemoteAddr, r.Method, r.URL, event, status) +} + +func (h *Handler) prHandler(w http.ResponseWriter, r *http.Request) { + var prb PullRequestBody + body, err := readBody(r, &prb) if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + logError(w, err.Error()) return } - log.Printf("debug headers: %#v", r.Header) - log.Printf("debug: %s", string(body)) - err = json.Unmarshal(body, &p) - if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) - return - } - if r.Header.Get("X-Interceptor-Ref") == p.Ref { + if contains(r.Header[prAction], prb.Action) { + h := w.Header() + h.Set(issueHeader, strconv.FormatInt(prb.Number, 10)) + h.Set(commitHeader, prb.PullRequest.Head.SHA) w.Write(body) return } w.WriteHeader(http.StatusBadRequest) } -type CommentBody struct { - Comment Comment `json:"comment"` -} - -type Comment struct { - Body string `json:"body"` -} - -func commentHandler(w http.ResponseWriter, r *http.Request) { - var c CommentBody - defer r.Body.Close() - body, err := ioutil.ReadAll(r.Body) +func (h *Handler) pushHandler(w http.ResponseWriter, r *http.Request) { + var pb PushBody + body, err := readBody(r, &pb) if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + logError(w, err.Error()) return } - log.Printf("debug headers: %#v", r.Header) - log.Printf("debug: %s", string(body)) - err = json.Unmarshal(body, &c) - if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) - return - } - if r.Header.Get("X-Interceptor-Comment") == c.Comment.Body { + if contains(r.Header[pushAction], pb.Ref) { + h := w.Header() + h.Set(commitHeader, pb.After) w.Write(body) return } w.WriteHeader(http.StatusBadRequest) } -func dumpHandler(w http.ResponseWriter, r *http.Request) { - defer r.Body.Close() - body, err := ioutil.ReadAll(r.Body) +func (h *Handler) commentHandler(w http.ResponseWriter, r *http.Request) { + var cb CommentBody + body, err := readBody(r, &cb) if err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + logError(w, err.Error()) return } - log.Printf("debug headers: %#v", r.Header) - log.Printf("debug: %s", string(body)) + //if label := r.Header.Get(labelHeader); label != "" { + //} + if contains(r.Header[commentAction], cb.Comment.Body) { + issue := strconv.FormatInt(cb.Issue.Number, 10) + api := detectAPI(r) + if api == "" { + logError(w, "unable to detect git provider API") + return + } + pr, err := h.getPullRequest(cb.Repository, api, issue) + if err != nil { + logError(w, err.Error()) + return + } + + h := w.Header() + h.Set(issueHeader, issue) + h.Set(commitHeader, pr.Head.SHA) + w.Write(body) + return + } + w.WriteHeader(http.StatusBadRequest) +} + +func (h *Handler) dumpHandler(w http.ResponseWriter, r *http.Request) { + defer r.Body.Close() + if debug { + body, err := ioutil.ReadAll(r.Body) + if err != nil { + logError(w, err.Error()) + return + } + log.Printf("debug headers: %#v", r.Header) + log.Printf("debug: %s", string(body)) + } w.WriteHeader(http.StatusBadRequest) } func main() { - http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { - event := r.Header.Get("X-GitHub-Event") - log.Printf("%s %s %s: %s", r.RemoteAddr, r.Method, r.URL, event) - switch event { - case "pull_request": - prHandler(w, r) - case "push": - pushHandler(w, r) - //case "issue_comment": - // commentHandler(w, r) - default: - dumpHandler(w, r) - } - }) + cfg, err := rest.InClusterConfig() + if err != nil { + log.Fatalf("error configuring kube client: %s\n", err) + } + cl, err := kubernetes.NewForConfig(cfg) + if err != nil { + log.Fatalf("error creating new kube client: %s\n", err) + } + ns, err := getNS() + if err != nil { + log.Fatalf("error getting current namespace %s\n", err) + } + h := &Handler{ + sec: cl.CoreV1().Secrets(ns), + cl: &http.Client{Transport: &http.Transport{ + DialContext: (&net.Dialer{ + Timeout: 30 * time.Second, + }).DialContext, + }}, + } + + http.Handle("/", h) s := &http.Server{ ReadTimeout: 5 * time.Second, WriteTimeout: 10 * time.Second, IdleTimeout: 120 * time.Second, Addr: ":8080", } + log.Println("started webhook listener") log.Fatal(s.ListenAndServe()) } diff --git a/types.go b/types.go new file mode 100644 index 0000000..b425009 --- /dev/null +++ b/types.go @@ -0,0 +1,52 @@ +// Copyright (C) 2019 Marius Schellenberger + +package main + +type PullRequestBody struct { + Action string `json:"action"` + Number int64 `json:"number"` + PullRequest PullRequest `json:"pull_request"` +} + +type PullRequest struct { + Head Head `json:"head"` + Labels []Label `json:"labels"` +} + +type Head struct { + SHA string `json:"sha"` +} + +type Label struct { + Name string `json:"name"` +} + +type PushBody struct { + Ref string `json:"ref"` + After string `json:"after"` +} + +type CommentBody struct { + Issue Issue `json:"issue"` + Comment Comment `json:"comment"` + Repository Repository `json:"repository"` +} + +type Issue struct { + Number int64 `json:"number"` + Labels []Label `json:"labels"` +} + +type Comment struct { + Body string `json:"body"` +} + +type Repository struct { + Name string `json:"name"` + Owner Owner `json:"owner"` + CloneURL string `json:"clone_url"` +} + +type Owner struct { + Login string `json:"login"` +}