First commit

Dockerfile

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+FROM golang:1.11-alpine
+
+LABEL "com.github.actions.name"="Auto Close"
+LABEL "com.github.actions.description"="Auto close pull requests"
+LABEL "com.github.actions.icon"="slash"
+LABEL "com.github.actions.color"="red"
+
+WORKDIR $GOPATH/src/github.com/superbrothers/auto-close-action
+COPY . .
+RUN set -x && go build -o /action
+
+ENTRYPOINT ["/action"]

Gopkg.toml

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+# Gopkg.toml example
+#
+# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#   name = "github.com/x/y"
+#   version = "2.4.0"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+[[constraint]]
+  name = "github.com/google/go-github"
+  version ="v24.0.0"
+
+[[constraint]]
+  name = "golang.org/x/oauth2"
+  branch = "master"
+
+[prune]
+  go-tests = true
+  unused-packages = true

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2019  Kazuki Suda <kazuki.suda@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Makefile

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+REPO := superbrothers/auto-close-action
+
+.PHONY: image
+image:
+		docker build -t $(REPO) .

README.md

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+# :no_entry_sign: Auto close pull requests GitHub Action
+
+A GitHub Action to automatically close pull requests.
+
+## Usage
+
+This Action subscribes to `pull_request` events. When receiving a `pull_request` event, this action close the pull request triggered by the event immediately.
+
+```workflow
+workflow "New workflow" {
+  on = "pull_request"
+  resolves = ["Auto Close"]
+}
+
+action "Auto Close" {
+  uses = "superbrothers/auto-close-action"
+  env = {
+    # Optional. Post a issue comment just before closing a pull request.
+    COMMENT = "We do not accept PRs. If you have any questions, please feel free to connect us."
+  }
+  secrets = ["GITHUB_TOKEN"]
+}
+```
+
+<img src="./docs/auto-close-action.png" width="400px">
+
+## Environment variables
+
+- `COMMENT` - *Optional*. Post an issue comment just before closing a pull request.
+
+## LICENSE
+
+This software is released under the MIT License.

main.go

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+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/google/go-github/github"
+	"golang.org/x/oauth2"
+)
+
+func main() {
+	eventName := os.Getenv("GITHUB_EVENT_NAME")
+	if eventName != "pull_request" {
+		fmt.Printf("Ignoring event %s (only listens for 'pull_request')\n", eventName)
+		return
+	}
+
+	ctx := context.Background()
+	client := newClient(ctx)
+
+	f, err := os.Open(os.Getenv("GITHUB_EVENT_PATH"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	decorder := json.NewDecoder(f)
+	var triggerEvent github.PullRequestEvent
+	if err := decorder.Decode(&triggerEvent); err != nil {
+		log.Fatal(err)
+	}
+
+	fullRepo := os.Getenv("GITHUB_REPOSITORY")
+	repo := strings.SplitN(fullRepo, "/", 2)
+	if len(repo) != 2 {
+		log.Fatalf("Invalid repo name: %s\n", fullRepo)
+	}
+
+	number := *triggerEvent.Number
+
+	body := os.Getenv("COMMENT")
+	if len(body) > 0 {
+		issueComment := &github.IssueComment{Body: &body}
+		_, _, err = client.Issues.CreateComment(ctx, repo[0], repo[1], number, issueComment)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	state := "closed"
+	pr := &github.PullRequest{State: &state}
+	_, _, err = client.PullRequests.Edit(ctx, repo[0], repo[1], number, pr)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Printf("Closed PR %d\n", number)
+}
+
+func newClient(ctx context.Context) *github.Client {
+	token := os.Getenv("GITHUB_TOKEN")
+
+	ts := oauth2.StaticTokenSource(
+		&oauth2.Token{AccessToken: token},
+	)
+	tc := oauth2.NewClient(ctx, ts)
+
+	return github.NewClient(tc)
+}