Add Dockerfile, update README, minor refactoring.

Dockerfile

@@ -0,0 +1,11 @@
+FROM golang:latest
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+COPY . .
+RUN go build -v -o ./bin/drone-example .
+
+CMD ["./bin/drone-example"]

README.md

@@ -1,29 +1,25 @@
-# API to check for Maths students
+# Go Maths students API
 
-## Server Prerequisites
+A simple Go API whose only purpose is to check whether an user is a Maths student or not.
 
-- Having `go` installed
+## Prerequisites
 - An environment variable `AUTHPDS_TOKEN` containing the authentication token for the external API.
 - An environment variable named `SECRET` containing the secret token for authorization.
 
-## Server Setup
+## Docker
 
-- Clone the repository:
-  ```
-  git clone https://git.phc.dm.unipi.it/phc/go-maths-api
-  ```
-- Change directory and build the project:
-  ```
-  cd go-maths-api
-  go build
-  ```
-- Run with `./go-maths-api`
+To build and run the image from the provided `Dockerfile`:
+
+```bash shell
+$ docker build -t go-maths-api .
+$ docker run -d --restart always -p 127.235.203.11:1099 --env 'AUTHPDS_TOKEN' --env 'SECRET' --name go-maths-api go-maths-api
+```
 
 ## Client Usage
 
-An example request (with `SECRET` defined in your environment):
+An example request to the local Docker image (with `SECRET` defined in your environment):
 ```
-curl -X GET "http://localhost:8080/check-maths-user?SANITIZED_USER=f.minnocci" -H "Authorization: Bearer $SECRET"
+curl -X GET "http://asdf:8080/check-maths-user?user=f.minnocci" -H "Authorization: Bearer $SECRET"
 ```
 
 Successful JSON response:

go.mod

@@ -0,0 +1,3 @@
+module git.phc.dm.unipi.it/phc/go-maths-api
+
+go 1.21.1

main.go

@@ -17,8 +17,8 @@ func main() {
 }
 
 func CheckMathsUserHandler(w http.ResponseWriter, r *http.Request) {
-	// Get the SANITIZED_USER from the query parameters
-	sanitizedUser := r.URL.Query().Get("SANITIZED_USER")
+	// Get the username from the query parameters
+	userName := r.URL.Query().Get("user")
 
 	// Get the AUTHORIZATION header value, which should include the secret token
 	authHeader := r.Header.Get("Authorization")
@@ -34,7 +34,7 @@ func CheckMathsUserHandler(w http.ResponseWriter, r *http.Request) {
 	authPdsToken := os.Getenv("AUTHPDS_TOKEN")
 
 	// Make a GET request to the external API
-	apiURL := fmt.Sprintf("https://api.unipi.it/authPds/api/Carriera/studente/uid/%s/", sanitizedUser)
+	apiURL := fmt.Sprintf("https://api.unipi.it/authPds/api/Carriera/studente/uid/%s/", userName)
 	req, err := http.NewRequest("GET", apiURL, nil)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)