WIP GitHub call to publish release draft

Author: Dan Rees

ci/tasks/publish-draft-release/publish-draft-release.go

@@ -0,0 +1,148 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+const (
+	gitHubUrl                      string = "https://github.com/"
+	gitHubCredentialsVariable      string = "GITHUB_ACCESS_KEY"
+	defaultVersion                 string = "latest"
+	defaultBranch                  string = "master"
+	minimumNumberOfCommandLineArgs int    = 3
+)
+
+var (
+	releaseApiUrl string = gitHubUrl + "repos/" + owner + "/" + repo + "/releases/"
+	owner         string
+	repo          string
+	branch        string
+	version       string
+	description   string
+	credentials   string = os.Getenv(gitHubCredentialsVariable)
+)
+
+type Release struct {
+	TagName    string `json:"tag_name"`
+	Branch     string `json:"target_commitish"`
+	Name       string `json:"name"`
+	Body       string `json:"body"`
+	Draft      bool   `json:"draft"`
+	Prerelease bool   `json:"prerelease"`
+}
+
+func getReleaseApiUrl() string {
+	return releaseApiUrl + version
+}
+
+func sendRequest(body io.Reader, bodySize int64) (*http.Response, error) {
+	req, err := http.NewRequest("PATCH", getReleaseApiUrl(), body)
+
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Authorization", fmt.Sprintf("token %s", credentials))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/vnd.github.v3+json")
+	req.ContentLength = bodySize
+
+	os.Stdout.WriteString(fmt.Sprintf("Sending request to %s with data %s", getReleaseApiUrl(), body))
+
+	resp, err := http.DefaultClient.Do(req)
+	defer resp.Body.Close()
+
+	if err != nil {
+		return resp, err
+	}
+
+	return resp, err
+}
+
+func publishDraftRelease() error {
+	release := Release{
+		TagName:    version,
+		Branch:     branch,
+		Name:       version,
+		Body:       description,
+		Draft:      false,
+		Prerelease: false,
+	}
+
+	releaseData, err := json.Marshal(release)
+
+	if err != nil {
+		return fmt.Errorf("error setting JSON data %s when publishing draft release to %s due to %s", releaseData, getReleaseApiUrl(), err)
+	}
+
+	releaseBuffer := bytes.NewBuffer(releaseData)
+
+	resp, err := sendRequest(releaseBuffer, int64(releaseBuffer.Len()))
+
+	if err != nil {
+		return fmt.Errorf("error publishing draft release to %s with response %s", getReleaseApiUrl(), resp)
+	}
+
+	if resp == nil {
+		return fmt.Errorf("error publishing draft release to %s with nil response", getReleaseApiUrl())
+	}
+
+	code := resp.StatusCode
+
+	if code != http.StatusOK {
+		return fmt.Errorf("error publishing draft release to %s with response code %d", getReleaseApiUrl(), code)
+	}
+
+	return nil
+}
+
+func main() {
+	if credentials == "" {
+		os.Stderr.WriteString("Must provide GitHub credentials via GITHUB_CREDENTIALS\n")
+		os.Exit(1)
+	}
+
+	if len(os.Args) != minimumNumberOfCommandLineArgs {
+		os.Stderr.WriteString(fmt.Sprintf("Only found %d arguments - Must provide owner and repo\n", len(os.Args)))
+		os.Exit(1)
+	}
+
+	owner = os.Args[1]
+	repo = os.Args[2]
+	version = os.Args[3]
+	branch = os.Args[4]
+	description = os.Args[5]
+
+	if owner == "" {
+		os.Stderr.WriteString("Must provide owner as the first argument\n")
+		os.Exit(1)
+	}
+
+	if repo == "" {
+		os.Stderr.WriteString("Must provide repo as the second argument\n")
+		os.Exit(1)
+	}
+
+	if version == "" {
+		version = defaultVersion
+	}
+
+	if branch == "" {
+		branch = defaultBranch
+	}
+
+	if description == "" {
+		description = version
+	}
+
+	err := publishDraftRelease()
+
+	if err != nil {
+		os.Stderr.WriteString(fmt.Sprintf("Failed to publish draft release - %s\n", err))
+	}
+}

ci/tasks/publish-draft-release/publish-draft-release.yml

@@ -0,0 +1,15 @@
+platform: linux
+image_resource:
+  type: docker-image
+  source:
+    repository: engineerbetter/pcf-ops
+inputs:
+- name: devtools-boshrelease 
+run:
+  path: /bin/bash
+  args:
+  - -c
+  - | 
+    cp -R devtools-boshrelease/ci/tasks/publish-draft-release /go/src/
+    cd /go/src/publish-draft-release
+    go run publish-draft-release.go owner repo version branch