add support for website redirects

DOCS.md

@@ -10,6 +10,7 @@ Use the S3 sync plugin to synchronize files and folders with an Amazon S3 bucket
 * `delete` - deletes files in the target not found in the source
 * `content_type` - override default mime-types to use this value
 * `metadata` - set custom metadata
+* `redirects` - targets that should redirect elsewhere
 
 The following is a sample S3 configuration in your .drone.yml file:
 
@@ -87,3 +88,20 @@ publish:
       "*.html":
         Cache-Control: "max-age: 1000"
 ```
+
+Additionally, you can specify redirect targets for files that don't exist by using the `redirects` key:
+
+```yaml
+publish:
+  s3_sync:
+    acl: public-read
+    region: "us-east-1"
+    bucket: "my-bucket.s3-website-us-east-1.amazonaws.com"
+    access_key: "970d28f4dd477bc184fbd10b376de753"
+    secret_key: "9c5785d3ece6a9cdefa42eb99b58986f9095ff1c"
+    source: folder/to/archive
+    target: /target/location
+    delete: true
+    redirects:
+      some/missing/file: /somewhere/that/actually/exists
+```

aws.go

@@ -231,6 +231,24 @@ func (a *AWS) visit(path string, info os.FileInfo, err error) error {
 	return err
 }
 
+func (a *AWS) AddRedirects(redirects map[string]string) error {
+	for path, location := range redirects {
+		fmt.Printf("Adding redirect from \"%s\" to \"%s\"", path, location)
+		a.local = append(a.local, strings.TrimPrefix(path, "/"))
+		_, err := a.client.PutObject(&s3.PutObjectInput{
+			Bucket: aws.String(a.vargs.Bucket),
+			Key:    aws.String(path),
+			WebsiteRedirectLocation: aws.String(location),
+		})
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (a *AWS) List(path string) error {
 	resp, err := a.client.ListObjects(&s3.ListObjectsInput{
 		Bucket: aws.String(a.vargs.Bucket),

main.go

@@ -51,6 +51,14 @@ func main() {
 		os.Exit(1)
 	}
 
+	if len(vargs.Redirects) > 0 {
+		err = client.AddRedirects(vargs.Redirects)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	}
+
 	if vargs.Delete {
 		err = client.Cleanup()
 		if err != nil {

types.go

@@ -13,6 +13,7 @@ type PluginArgs struct {
 	Access      StringMap         `json:"acl"`
 	ContentType StringMap         `json:"content_type"`
 	Metadata    DeepStringMap     `json:"metadata"`
+	Redirects   map[string]string `json:"redirects"`
 }
 
 type DeepStringMap struct {