added post method to add new albums, and new get method to get album by specific id

main.go

@@ -6,6 +6,37 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+// postAlbums adds an album from JSON received in the request body.
+func postAlbums(c *gin.Context) {
+	var newAlbum album
+
+	// Call BindJSON to bind the received JSON to
+	// newAlbum.
+	if err := c.BindJSON(&newAlbum); err != nil {
+		return
+	}
+
+	// Add the new album to the slice.
+	albums = append(albums, newAlbum)
+	c.IndentedJSON(http.StatusCreated, newAlbum)
+}
+
+// getAlbumByID locates the album whose ID value matches the id
+// parameter sent by the client, then returns that album as a response.
+func getAlbumByID(c *gin.Context) {
+	id := c.Param("id")
+
+	// Loop over the list of albums, looking for
+	// an album whose ID value matches the parameter.
+	for _, a := range albums {
+		if a.ID == id {
+			c.IndentedJSON(http.StatusOK, a)
+			return
+		}
+	}
+	c.IndentedJSON(http.StatusNotFound, gin.H{"message": "album not found"})
+}
+
 // album represents data about a record album.
 type album struct {
 	ID     string  `json:"id"`
@@ -24,6 +55,8 @@ var albums = []album{
 func main() {
 	router := gin.Default()
 	router.GET("/albums", getAlbums)
+	router.GET("/albums/:id", getAlbumByID)
+	router.POST("/albums", postAlbums)
 
 	router.Run("localhost:8080")
 }