Convert apikeyprotected-secret to apikey-secret with proper Golang template

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

sample-functions/README.md

@@ -17,10 +17,10 @@ For examples of hello-world in different programming languages see inside the Ba
 
 Here is a list of some of the sample functions included this repository.
 
-| Name                   | Details |
-|------------------------|-----------------------------------------                          |
+| Name                     | Details |
+|--------------------------|-----------------------------------------                          |
 | AlpineFunction           | BusyBox - a useful base image with busybox utilities pre-installed        |
-| ApiKeyProtected-Secrets  | Example in Golang showing how to read a secret from a HTTP header and validate with a Swarm/Kubernetes secret |
+| apikey-secret            | Example in Golang showing how to read a secret from a HTTP header and validate with a Swarm/Kubernetes secret |
 | CaptainsIntent           | Alexa skill - find the count of Docker Captains |
 | ChangeColorIntent        | Alexa skill - change the colour of IoT-connected lights |
 | echo                     | Uses `cat` from BusyBox to provide an echo function |

sample-functions/apikey-secret.yml

+provider:
+  name: faas
+  gateway: http://localhost:8080
+
+functions:
+  apikey-secret:
+    lang: go
+    handler: ./apikey-secret
+    image: apikey-secret

sample-functions/apikey-secret/README.md

+### Sample: apikey-secret
+
+This function returns access denied, or unlocked depending on whether your header for X-Api-Key matches a secret in the cluster called `secret_api_key`.
+
+See the [secure secret management guide](../guide/secure_secret_management.md) for more information on secrets.
+
+## Trying the sample:
+
+```
+
+$ docker secret remove secret_api_key  # make sure we delete any existing secret
+
+# Create a secret with Swarm
+$ echo "secret_value_goes_here" | docker secret create secret_api_key
+
+# Deploy this sample with Docker Swarm and attach the secret to it
+
+$ cd faas/sample-functions/
+$ faas-cli deploy --filter apikey-secret --secret secret_api_key
+
+# Now invoke the function with a good value:
+
+$ echo -n | faas invoke --header "X-Api-Key=secret_value_goes_here" apikey-secret
+You unlocked the function.
+
+# Now invoke with a bad value:
+
+echo -n | faas invoke --header "X-Api-Key=wrong_secret_value_goes_here" apikey-secret
+Access was denied.
+
+```
\ No newline at end of file

sample-functions/apikey-secret/handler.go

+package function
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+)
+
+// Handle a serverless request
+func Handle(req []byte) string {
+
+	key := os.Getenv("Http_X_Api_Key") // converted via the Header: X-Api-Key
+
+	secretBytes, err := ioutil.ReadFile("/run/secrets/secret_api_key") // You must create a secret ahead of time named `secret_api_key`
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	secret := strings.TrimSpace(string(secretBytes))
+
+	message := "Access was denied."
+	if key == secret {
+		message = "You unlocked the function."
+	}
+
+	return message
+}

sample-functions/stack.yml

@@ -10,10 +10,10 @@ functions:
     environment:
       fprocess: "cat"
 
-  apikeyprotected:
-    lang: dockerfile
-    handler: ./AlpineFunction
-    image: functions/api-key-protected:latest
+  apikey-secret:
+    lang: go
+    handler: ./apikey-secret
+    image: functions/apikey-secret:0.1
 
   captainsintent:
     lang: dockerfile