Creating listMoviesHandler and adding /v1/movies GET endpoint to use it.

cmd/api/movies.go

@@ -202,3 +202,40 @@ func (app *application) deleteMovieHandler(w http.ResponseWriter, r *http.Reques
 		app.serverErrorResponse(w, r, err)
 	}
 }
+
+func (app *application) listMoviesHandler(w http.ResponseWriter, r *http.Request) {
+	// To keep things consistent with our other handlers, we'll define an input struct to hold the expected values from the request query string
+	var input struct {
+		Title    string
+		Genres   []string
+		Page     int
+		PageSize int
+		Sort     string
+	}
+
+	// Initialize a new Validator instance
+	v := validator.New()
+
+	// Call r.URL.Query() to get the url.Values map containing the query string data.
+	qs := r.URL.Query()
+
+	// Use our helpers to extract the title and genres query strings values, falling back to defaults of an empty string and an empty slice respectively if they are not provided by the client.
+	input.Title = app.readString(qs, "title", "")
+	input.Genres = app.readCSV(qs, "genres", []string{})
+
+	// Get the page and page_size query string values as integers. Notice that we set the default page value to 1 and default page_size to 20, and that we pass the validator instance as the final argument here
+	input.Page = app.readInt(qs, "page", 1, v)
+	input.PageSize = app.readInt(qs, "page_size", 20, v)
+
+	// Extract the sort query string value, falling back to "id" if it is not provided by the client (which will imply an ascending sort on movie ID)
+	input.Sort = app.readString(qs, "sort", "id")
+
+	// Check the Validator instance for any errors and use the failedValidationResponse() helper to send the client a response if necessary
+	if !v.Valid() {
+		app.failedValidationResponse(w, r, v.Errors)
+		return
+	}
+
+	// Dump the contents of the input struct in a HTTP response
+	fmt.Fprintf(w, "%+v\n", input)
+}

cmd/api/routes.go

@@ -22,6 +22,8 @@ func (app *application) routes() http.Handler {
 		respectively.
 	*/
 	router.HandlerFunc(http.MethodGet, "/v1/healthcheck", app.healthcheckHandler)
+
+	router.HandlerFunc(http.MethodGet, "/v1/movies", app.listMoviesHandler)
 	router.HandlerFunc(http.MethodPost, "/v1/movies", app.createMovieHandler)
 	router.HandlerFunc(http.MethodGet, "/v1/movies/:id", app.showMovieHandler)
 	router.HandlerFunc(http.MethodPatch, "/v1/movies/:id", app.updateMovieHandler)